From 4c4920c3a97a08b4d969fb813a0cc08dd8abe100 Mon Sep 17 00:00:00 2001
From: Max Schaefer <max@semmle.com>
Date: Tue, 6 Nov 2018 08:25:02 +0000
Subject: [PATCH] JavaScript: Open-source extractor.

---
 javascript/extractor/.classpath               |    20 +
 javascript/extractor/.gitignore               |     2 +
 javascript/extractor/.project                 |    17 +
 .../org.eclipse.core.resources.prefs          |     3 +
 javascript/extractor/README.md                |     9 +
 javascript/extractor/lib/esregex/.gitignore   |     1 +
 javascript/extractor/lib/esregex/README.md    |     4 +
 javascript/extractor/lib/esregex/package.json |    13 +
 .../extractor/lib/esregex/regexparser.js      |   477 +
 .../extractor/lib/esregex/tests/runtests.js   |   638 +
 .../lib/external/doctrine/.gitignore          |     3 +
 .../extractor/lib/external/doctrine/.scripted |     6 +
 .../lib/external/doctrine/.travis.yml         |     4 +
 .../lib/external/doctrine/CONTRIBUTING.md     |     5 +
 .../lib/external/doctrine/LICENSE.BSD         |    19 +
 .../doctrine/LICENSE.closure-compiler         |   202 +
 .../lib/external/doctrine/LICENSE.esprima     |    19 +
 .../extractor/lib/external/doctrine/README.md |   173 +
 .../lib/external/doctrine/doctrine.js         |  2146 ++++
 .../lib/external/doctrine/eslint.json         |    22 +
 .../lib/external/doctrine/package.json        |    34 +
 .../lib/external/doctrine/test/parse.js       |  1888 +++
 .../lib/external/doctrine/test/strict.js      |   165 +
 .../lib/external/doctrine/test/stringify.js   |   410 +
 .../lib/external/doctrine/test/test.html      |    31 +
 .../lib/external/doctrine/test/unwrap.js      |    57 +
 .../extractor/lib/typescript/.gitignore       |     2 +
 javascript/extractor/lib/typescript/.yarnrc   |     1 +
 .../extractor/lib/typescript/package.json     |    20 +
 .../extractor/lib/typescript/rollup.config.js |    51 +
 .../lib/typescript/src/ast_extractor.ts       |   329 +
 .../extractor/lib/typescript/src/common.ts    |    28 +
 .../extractor/lib/typescript/src/main.ts      |   443 +
 .../lib/typescript/src/type_table.ts          |  1178 ++
 .../lib/typescript/src/typescript.d.ts        |     2 +
 .../lib/typescript/src/typescript.js          |     8 +
 .../extractor/lib/typescript/tsconfig.json    |    16 +
 .../extractor/lib/typescript/tslint.json      |    64 +
 javascript/extractor/lib/typescript/yarn.lock |   518 +
 .../extractor/lib/typescript/yarnrc-build     |     1 +
 .../extractor/parser-tests/babylon/README.md  |     3 +
 .../asi-failure-computed/actual.js            |     4 +
 .../asi-failure-computed/expected.error       |     1 +
 .../asi-failure-generator/actual.js           |     4 +
 .../asi-failure-generator/expected.error      |     1 +
 .../class-properties/asi-success/actual.js    |     9 +
 .../class-properties/asi-success/expected.ast |   275 +
 .../function-sent/inside-function/actual.js   |     3 +
 .../inside-function/expected.error            |     1 +
 .../function-sent/inside-generator/actual.js  |     3 +
 .../inside-generator/expected.ast             |   131 +
 .../function-sent/invalid-property/actual.js  |     3 +
 .../invalid-property/expected.error           |     1 +
 .../experimental/uncategorised/10/actual.js   |     1 +
 .../uncategorised/10/expected.ast             |   169 +
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 .../experimental/uncategorised/62/actual.js   |     3 +
 .../uncategorised/62/expected.ast             |   167 +
 .../experimental/uncategorised/9/actual.js    |     1 +
 .../experimental/uncategorised/9/expected.ast |   119 +
 .../parser-tests/babylon/generate-tests.patch |   110 +
 .../object-rest-spread/actual.js              |     3 +
 .../object-rest-spread/expected.ast           |   205 +
 .../parser-tests/jcorn-jsx/README.md          |     3 +
 .../jcorn-jsx/generate-tests.patch            |    61 +
 .../parser-tests/jcorn-jsx/test0.fail         |     1 +
 .../extractor/parser-tests/jcorn-jsx/test0.js |     1 +
 .../parser-tests/jcorn-jsx/test1.fail         |     1 +
 .../extractor/parser-tests/jcorn-jsx/test1.js |     1 +
 .../parser-tests/jcorn-jsx/test10.ast         |    70 +
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 .../parser-tests/jcorn-jsx/test11.ast         |   100 +
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 .../parser-tests/jcorn-jsx/test12.ast         |   167 +
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 .../parser-tests/jcorn-jsx/test14.ast         |   131 +
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 .../parser-tests/jcorn-jsx/test16.ast         |   118 +
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 .../parser-tests/jcorn-jsx/test17.ast         |   168 +
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 .../parser-tests/jcorn-jsx/test18.ast         |   281 +
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 .../parser-tests/jcorn-jsx/test19.ast         |   162 +
 .../parser-tests/jcorn-jsx/test19.js          |     1 +
 .../parser-tests/jcorn-jsx/test2.ast          |   108 +
 .../extractor/parser-tests/jcorn-jsx/test2.js |     1 +
 .../parser-tests/jcorn-jsx/test2.options.json |     3 +
 .../parser-tests/jcorn-jsx/test20.ast         |   224 +
 .../parser-tests/jcorn-jsx/test20.js          |     1 +
 .../parser-tests/jcorn-jsx/test21.ast         |   102 +
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 .../parser-tests/jcorn-jsx/test22.ast         |   102 +
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 .../parser-tests/jcorn-jsx/test23.ast         |   150 +
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 .../parser-tests/jcorn-jsx/test24.ast         |   228 +
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 .../parser-tests/jcorn-jsx/test25.ast         |   498 +
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 .../parser-tests/jcorn-jsx/test26.ast         |   214 +
 .../parser-tests/jcorn-jsx/test26.js          |     1 +
 .../parser-tests/jcorn-jsx/test27.ast         |   150 +
 .../parser-tests/jcorn-jsx/test27.js          |     1 +
 .../parser-tests/jcorn-jsx/test28.ast         |   140 +
 .../parser-tests/jcorn-jsx/test28.js          |     1 +
 .../parser-tests/jcorn-jsx/test29.ast         |    90 +
 .../parser-tests/jcorn-jsx/test29.js          |     1 +
 .../parser-tests/jcorn-jsx/test3.fail         |     1 +
 .../extractor/parser-tests/jcorn-jsx/test3.js |     1 +
 .../parser-tests/jcorn-jsx/test3.options.json |     3 +
 .../parser-tests/jcorn-jsx/test30.ast         |   139 +
 .../parser-tests/jcorn-jsx/test30.js          |     1 +
 .../parser-tests/jcorn-jsx/test31.ast         |   113 +
 .../parser-tests/jcorn-jsx/test31.js          |     1 +
 .../parser-tests/jcorn-jsx/test32.ast         |    87 +
 .../parser-tests/jcorn-jsx/test32.js          |     3 +
 .../parser-tests/jcorn-jsx/test4.fail         |     1 +
 .../extractor/parser-tests/jcorn-jsx/test4.js |     1 +
 .../parser-tests/jcorn-jsx/test4.options.json |     3 +
 .../parser-tests/jcorn-jsx/test5.ast          |     1 +
 .../extractor/parser-tests/jcorn-jsx/test5.js |     1 +
 .../parser-tests/jcorn-jsx/test6.ast          |    70 +
 .../extractor/parser-tests/jcorn-jsx/test6.js |     1 +
 .../parser-tests/jcorn-jsx/test7.ast          |   165 +
 .../extractor/parser-tests/jcorn-jsx/test7.js |     1 +
 .../parser-tests/jcorn-jsx/test8.ast          |   377 +
 .../extractor/parser-tests/jcorn-jsx/test8.js |     1 +
 .../parser-tests/jcorn-jsx/test9.ast          |   210 +
 .../extractor/parser-tests/jcorn-jsx/test9.js |     1 +
 .../parser-tests/robustness/letLookahead.js   |   505 +
 .../src/com/semmle/jcorn/CustomParser.java    |   323 +
 .../src/com/semmle/jcorn/ESNextParser.java    |   485 +
 .../src/com/semmle/jcorn/Identifiers.java     |   117 +
 .../src/com/semmle/jcorn/Locutil.java         |    27 +
 .../src/com/semmle/jcorn/Options.java         |   238 +
 .../src/com/semmle/jcorn/Parser.java          |  3547 ++++++
 .../extractor/src/com/semmle/jcorn/README.md  |     1 +
 .../src/com/semmle/jcorn/SyntaxError.java     |    18 +
 .../src/com/semmle/jcorn/TokenType.java       |   279 +
 .../src/com/semmle/jcorn/Whitespace.java      |    18 +
 .../src/com/semmle/jcorn/flow/FlowParser.java |  1161 ++
 .../src/com/semmle/jcorn/jsx/JSXOptions.java  |    24 +
 .../src/com/semmle/jcorn/jsx/JSXParser.java   |   457 +
 .../com/semmle/jcorn/jsx/XHTMLEntities.java   |   263 +
 .../com/semmle/js/ast/ABinaryExpression.java  |    29 +
 .../src/com/semmle/js/ast/AClass.java         |    81 +
 .../src/com/semmle/js/ast/AFunction.java      |   144 +
 .../semmle/js/ast/AFunctionExpression.java    |    65 +
 .../src/com/semmle/js/ast/AST2JSON.java       |   853 ++
 .../com/semmle/js/ast/ArrayExpression.java    |    27 +
 .../src/com/semmle/js/ast/ArrayPattern.java   |    78 +
 .../js/ast/ArrowFunctionExpression.java       |    30 +
 .../semmle/js/ast/AssignmentExpression.java   |    15 +
 .../com/semmle/js/ast/AssignmentPattern.java  |    21 +
 .../com/semmle/js/ast/AwaitExpression.java    |    20 +
 .../com/semmle/js/ast/BinaryExpression.java   |    15 +
 .../src/com/semmle/js/ast/BindExpression.java |    28 +
 .../src/com/semmle/js/ast/BlockStatement.java |    27 +
 .../src/com/semmle/js/ast/BreakStatement.java |    15 +
 .../src/com/semmle/js/ast/CallExpression.java |    19 +
 .../src/com/semmle/js/ast/CatchClause.java    |    50 +
 .../src/com/semmle/js/ast/ClassBody.java      |    36 +
 .../com/semmle/js/ast/ClassDeclaration.java   |    66 +
 .../com/semmle/js/ast/ClassExpression.java    |    54 +
 .../src/com/semmle/js/ast/Comment.java        |    78 +
 .../com/semmle/js/ast/ComprehensionBlock.java |    43 +
 .../js/ast/ComprehensionExpression.java       |    61 +
 .../semmle/js/ast/ConditionalExpression.java  |    42 +
 .../com/semmle/js/ast/ContinueStatement.java  |    15 +
 .../com/semmle/js/ast/DebuggerStatement.java  |    15 +
 .../com/semmle/js/ast/DeclarationFlags.java   |   128 +
 .../src/com/semmle/js/ast/Decorator.java      |    19 +
 .../src/com/semmle/js/ast/DefaultVisitor.java |   737 ++
 .../semmle/js/ast/DestructuringPattern.java   |     7 +
 .../com/semmle/js/ast/DoWhileStatement.java   |    30 +
 .../src/com/semmle/js/ast/DynamicImport.java  |    19 +
 .../src/com/semmle/js/ast/EmptyStatement.java |    15 +
 .../semmle/js/ast/EnhancedForStatement.java   |    58 +
 .../semmle/js/ast/ExportAllDeclaration.java   |    26 +
 .../com/semmle/js/ast/ExportDeclaration.java  |     9 +
 .../js/ast/ExportDefaultDeclaration.java      |    36 +
 .../semmle/js/ast/ExportDefaultSpecifier.java |    16 +
 .../semmle/js/ast/ExportNamedDeclaration.java |    50 +
 .../js/ast/ExportNamespaceSpecifier.java      |    16 +
 .../com/semmle/js/ast/ExportSpecifier.java    |    32 +
 .../src/com/semmle/js/ast/Expression.java     |    31 +
 .../semmle/js/ast/ExpressionStatement.java    |    25 +
 .../com/semmle/js/ast/FieldDefinition.java    |    53 +
 .../src/com/semmle/js/ast/ForInStatement.java |    29 +
 .../src/com/semmle/js/ast/ForOfStatement.java |    30 +
 .../src/com/semmle/js/ast/ForStatement.java   |    79 +
 .../semmle/js/ast/FunctionDeclaration.java    |    87 +
 .../com/semmle/js/ast/FunctionExpression.java |    36 +
 .../src/com/semmle/js/ast/IFunction.java      |    94 +
 .../src/com/semmle/js/ast/INode.java          |    16 +
 .../src/com/semmle/js/ast/IPattern.java       |     8 +
 .../src/com/semmle/js/ast/ISourceElement.java |    11 +
 .../semmle/js/ast/IStatementContainer.java    |     7 +
 .../src/com/semmle/js/ast/Identifier.java     |    45 +
 .../src/com/semmle/js/ast/IfStatement.java    |    49 +
 .../com/semmle/js/ast/ImportDeclaration.java  |    42 +
 .../semmle/js/ast/ImportDefaultSpecifier.java |    19 +
 .../js/ast/ImportNamespaceSpecifier.java      |    18 +
 .../com/semmle/js/ast/ImportSpecifier.java    |    36 +
 .../com/semmle/js/ast/InvokeExpression.java   |    73 +
 .../src/com/semmle/js/ast/JumpStatement.java  |    27 +
 .../com/semmle/js/ast/LabeledStatement.java   |    34 +
 .../src/com/semmle/js/ast/LetExpression.java  |    30 +
 .../src/com/semmle/js/ast/LetStatement.java   |    30 +
 .../src/com/semmle/js/ast/Literal.java        |    96 +
 .../com/semmle/js/ast/LogicalExpression.java  |    15 +
 .../extractor/src/com/semmle/js/ast/Loop.java |    26 +
 .../com/semmle/js/ast/MemberDefinition.java   |   131 +
 .../com/semmle/js/ast/MemberExpression.java   |    57 +
 .../src/com/semmle/js/ast/MetaProperty.java   |    32 +
 .../com/semmle/js/ast/MethodDefinition.java   |    65 +
 .../src/com/semmle/js/ast/NewExpression.java  |    19 +
 .../extractor/src/com/semmle/js/ast/Node.java |    17 +
 .../src/com/semmle/js/ast/NodeCopier.java     |   707 ++
 .../com/semmle/js/ast/ObjectExpression.java   |    27 +
 .../src/com/semmle/js/ast/ObjectPattern.java  |    62 +
 .../js/ast/ParenthesizedExpression.java       |    30 +
 .../src/com/semmle/js/ast/Position.java       |    81 +
 .../src/com/semmle/js/ast/Program.java        |    44 +
 .../src/com/semmle/js/ast/Property.java       |   137 +
 .../src/com/semmle/js/ast/RestElement.java    |    29 +
 .../com/semmle/js/ast/ReturnStatement.java    |    32 +
 .../com/semmle/js/ast/SequenceExpression.java |    27 +
 .../src/com/semmle/js/ast/SourceElement.java  |    21 +
 .../src/com/semmle/js/ast/SourceLocation.java |    96 +
 .../src/com/semmle/js/ast/SpreadElement.java  |    25 +
 .../src/com/semmle/js/ast/Statement.java      |    10 +
 .../src/com/semmle/js/ast/Super.java          |    16 +
 .../src/com/semmle/js/ast/SwitchCase.java     |    50 +
 .../com/semmle/js/ast/SwitchStatement.java    |    36 +
 .../js/ast/TaggedTemplateExpression.java      |    34 +
 .../com/semmle/js/ast/TemplateElement.java    |    43 +
 .../com/semmle/js/ast/TemplateLiteral.java    |    82 +
 .../src/com/semmle/js/ast/ThisExpression.java |    15 +
 .../src/com/semmle/js/ast/ThrowStatement.java |    25 +
 .../src/com/semmle/js/ast/Token.java          |    75 +
 .../src/com/semmle/js/ast/TryStatement.java   |    83 +
 .../com/semmle/js/ast/UnaryExpression.java    |    46 +
 .../com/semmle/js/ast/UpdateExpression.java   |    44 +
 .../semmle/js/ast/VariableDeclaration.java    |    54 +
 .../com/semmle/js/ast/VariableDeclarator.java |    69 +
 .../src/com/semmle/js/ast/Visitor.java        |   177 +
 .../src/com/semmle/js/ast/WhileStatement.java |    30 +
 .../src/com/semmle/js/ast/WithStatement.java  |    34 +
 .../com/semmle/js/ast/YieldExpression.java    |    34 +
 .../com/semmle/js/ast/jsdoc/AllLiteral.java   |    22 +
 .../com/semmle/js/ast/jsdoc/ArrayType.java    |    24 +
 .../com/semmle/js/ast/jsdoc/CompoundType.java |    34 +
 .../com/semmle/js/ast/jsdoc/FieldType.java    |    51 +
 .../com/semmle/js/ast/jsdoc/FunctionType.java |   102 +
 .../com/semmle/js/ast/jsdoc/JSDocComment.java |    47 +
 .../com/semmle/js/ast/jsdoc/JSDocElement.java |    18 +
 .../src/com/semmle/js/ast/jsdoc/JSDocTag.java |    86 +
 .../js/ast/jsdoc/JSDocTypeExpression.java     |    27 +
 .../semmle/js/ast/jsdoc/NameExpression.java   |    32 +
 .../semmle/js/ast/jsdoc/NonNullableType.java  |    17 +
 .../com/semmle/js/ast/jsdoc/NullLiteral.java  |    22 +
 .../semmle/js/ast/jsdoc/NullableLiteral.java  |    22 +
 .../com/semmle/js/ast/jsdoc/NullableType.java |    17 +
 .../com/semmle/js/ast/jsdoc/OptionalType.java |    17 +
 .../semmle/js/ast/jsdoc/ParameterType.java    |    41 +
 .../com/semmle/js/ast/jsdoc/RecordType.java   |    42 +
 .../src/com/semmle/js/ast/jsdoc/RestType.java |    17 +
 .../semmle/js/ast/jsdoc/TypeApplication.java  |    57 +
 .../js/ast/jsdoc/UnaryTypeConstructor.java    |    45 +
 .../semmle/js/ast/jsdoc/UndefinedLiteral.java |    22 +
 .../com/semmle/js/ast/jsdoc/UnionType.java    |    24 +
 .../src/com/semmle/js/ast/jsdoc/Visitor.java  |    26 +
 .../com/semmle/js/ast/jsdoc/VoidLiteral.java  |    22 +
 .../com/semmle/js/ast/jsdoc/package-info.java |    14 +
 .../src/com/semmle/js/ast/json/JSONArray.java |    42 +
 .../com/semmle/js/ast/json/JSONLiteral.java   |    48 +
 .../com/semmle/js/ast/json/JSONObject.java    |    45 +
 .../src/com/semmle/js/ast/json/JSONValue.java |    28 +
 .../src/com/semmle/js/ast/json/Visitor.java   |    12 +
 .../com/semmle/js/ast/json/package-info.java  |    13 +
 .../com/semmle/js/ast/jsx/IJSXAttribute.java  |     6 +
 .../com/semmle/js/ast/jsx/IJSXExpression.java |     5 +
 .../src/com/semmle/js/ast/jsx/IJSXName.java   |     7 +
 .../com/semmle/js/ast/jsx/JSXAttribute.java   |    30 +
 .../semmle/js/ast/jsx/JSXBoundaryElement.java |     7 +
 .../semmle/js/ast/jsx/JSXClosingElement.java  |    25 +
 .../src/com/semmle/js/ast/jsx/JSXElement.java |    38 +
 .../semmle/js/ast/jsx/JSXEmptyExpression.java |    16 +
 .../js/ast/jsx/JSXExpressionContainer.java    |    24 +
 .../com/semmle/js/ast/jsx/JSXIdentifier.java  |    21 +
 .../js/ast/jsx/JSXMemberExpression.java       |    34 +
 .../semmle/js/ast/jsx/JSXNamespacedName.java  |    33 +
 .../semmle/js/ast/jsx/JSXOpeningElement.java  |    38 +
 .../semmle/js/ast/jsx/JSXSpreadAttribute.java |    24 +
 .../src/com/semmle/js/ast/package-info.java   |    30 +
 .../semmle/js/ast/regexp/BackReference.java   |    36 +
 .../src/com/semmle/js/ast/regexp/Caret.java   |    17 +
 .../semmle/js/ast/regexp/CharacterClass.java  |    38 +
 .../js/ast/regexp/CharacterClassEscape.java   |    35 +
 .../js/ast/regexp/CharacterClassRange.java    |    35 +
 .../com/semmle/js/ast/regexp/Constant.java    |    17 +
 .../semmle/js/ast/regexp/ControlEscape.java   |    18 +
 .../semmle/js/ast/regexp/ControlLetter.java   |    18 +
 .../semmle/js/ast/regexp/DecimalEscape.java   |    17 +
 .../com/semmle/js/ast/regexp/Disjunction.java |    29 +
 .../src/com/semmle/js/ast/regexp/Dollar.java  |    17 +
 .../src/com/semmle/js/ast/regexp/Dot.java     |    17 +
 .../src/com/semmle/js/ast/regexp/Error.java   |    23 +
 .../semmle/js/ast/regexp/EscapeSequence.java  |    31 +
 .../src/com/semmle/js/ast/regexp/Group.java   |    61 +
 .../js/ast/regexp/HexEscapeSequence.java      |    17 +
 .../semmle/js/ast/regexp/IdentityEscape.java  |    18 +
 .../src/com/semmle/js/ast/regexp/Literal.java |    22 +
 .../js/ast/regexp/NamedBackReference.java     |    36 +
 .../semmle/js/ast/regexp/NonWordBoundary.java |    17 +
 .../com/semmle/js/ast/regexp/OctalEscape.java |    17 +
 .../src/com/semmle/js/ast/regexp/Opt.java     |    17 +
 .../src/com/semmle/js/ast/regexp/Plus.java    |    17 +
 .../com/semmle/js/ast/regexp/Quantifier.java  |    31 +
 .../src/com/semmle/js/ast/regexp/Range.java   |    42 +
 .../com/semmle/js/ast/regexp/RegExpTerm.java  |    28 +
 .../com/semmle/js/ast/regexp/Sequence.java    |    29 +
 .../src/com/semmle/js/ast/regexp/Star.java    |    17 +
 .../js/ast/regexp/UnicodeEscapeSequence.java  |    17 +
 .../js/ast/regexp/UnicodePropertyEscape.java  |    50 +
 .../src/com/semmle/js/ast/regexp/Visitor.java |    37 +
 .../semmle/js/ast/regexp/WordBoundary.java    |    17 +
 .../regexp/ZeroWidthNegativeLookahead.java    |    27 +
 .../regexp/ZeroWidthNegativeLookbehind.java   |    27 +
 .../regexp/ZeroWidthPositiveLookahead.java    |    27 +
 .../regexp/ZeroWidthPositiveLookbehind.java   |    27 +
 .../semmle/js/ast/regexp/package-info.java    |    14 +
 .../com/semmle/js/extractor/ASTExtractor.java |  1878 +++
 .../com/semmle/js/extractor/AutoBuild.java    |   572 +
 .../com/semmle/js/extractor/CFGExtractor.java |  1918 +++
 .../semmle/js/extractor/DeclaredNames.java    |    41 +
 .../com/semmle/js/extractor/ExprKinds.java    |   273 +
 .../semmle/js/extractor/ExtractorConfig.java  |   376 +
 .../semmle/js/extractor/ExtractorState.java   |    33 +
 .../semmle/js/extractor/FileExtractor.java    |   470 +
 .../semmle/js/extractor/HTMLExtractor.java    |   317 +
 .../com/semmle/js/extractor/IExtractor.java   |    15 +
 .../semmle/js/extractor/JSDocExtractor.java   |   251 +
 .../com/semmle/js/extractor/JSExtractor.java  |   139 +
 .../semmle/js/extractor/JSONExtractor.java    |   112 +
 .../src/com/semmle/js/extractor/JumpType.java |     8 +
 .../semmle/js/extractor/LexicalExtractor.java |   176 +
 .../src/com/semmle/js/extractor/LoCInfo.java  |    27 +
 .../semmle/js/extractor/LocationManager.java  |   125 +
 .../src/com/semmle/js/extractor/Main.java     |   450 +
 .../semmle/js/extractor/NodeJSDetector.java   |   185 +
 .../semmle/js/extractor/RegExpExtractor.java  |   372 +
 .../com/semmle/js/extractor/ScopeManager.java |   744 ++
 .../semmle/js/extractor/ScriptExtractor.java  |    75 +
 .../com/semmle/js/extractor/StmtKinds.java    |    85 +
 .../js/extractor/SyntacticContextManager.java |   144 +
 .../semmle/js/extractor/TextualExtractor.java |   141 +
 .../semmle/js/extractor/TypeExprKinds.java    |   234 +
 .../js/extractor/TypeScriptExtractor.java     |    35 +
 .../semmle/js/extractor/TypeScriptMode.java   |    24 +
 .../semmle/js/extractor/YAMLExtractor.java    |   246 +
 .../js/extractor/test/ASTMatchingTests.java   |    93 +
 .../semmle/js/extractor/test/AllTests.java    |    23 +
 .../js/extractor/test/AutoBuildTests.java     |   428 +
 .../extractor/test/ClassPropertiesTests.java  |    46 +
 .../js/extractor/test/DecoratorTests.java     |    71 +
 .../extractor/test/ExportExtensionsTests.java |    43 +
 .../js/extractor/test/FunctionSentTests.java  |    26 +
 .../semmle/js/extractor/test/JSXTests.java    |    95 +
 .../extractor/test/NodeJSDetectorTests.java   |   198 +
 .../extractor/test/NumericSeparatorTests.java |    46 +
 .../extractor/test/ObjectRestSpreadTests.java |    60 +
 .../js/extractor/test/RobustnessTests.java    |    21 +
 .../semmle/js/extractor/test/TrapTests.java   |   168 +
 .../trapcache/CachingTrapWriter.java          |    80 +
 .../extractor/trapcache/DefaultTrapCache.java |   159 +
 .../extractor/trapcache/DummyTrapCache.java   |    16 +
 .../js/extractor/trapcache/ITrapCache.java    |    23 +
 .../src/com/semmle/js/parser/JSDocParser.java |   126 +
 .../src/com/semmle/js/parser/JSONParser.java  |   402 +
 .../com/semmle/js/parser/JSObjectDecoder.java |   196 +
 .../src/com/semmle/js/parser/JSParser.java    |    79 +
 .../com/semmle/js/parser/JcornWrapper.java    |    57 +
 .../src/com/semmle/js/parser/ParseError.java  |    52 +
 .../com/semmle/js/parser/ParsedProject.java   |    30 +
 .../com/semmle/js/parser/RegExpParser.java    |   150 +
 .../com/semmle/js/parser/ScriptLoader.java    |   152 +
 .../js/parser/TypeScriptASTConverter.java     |  2355 ++++
 .../semmle/js/parser/TypeScriptParser.java    |   413 +
 .../src/com/semmle/ts/ast/ArrayTypeExpr.java  |    26 +
 .../semmle/ts/ast/ConditionalTypeExpr.java    |    44 +
 .../src/com/semmle/ts/ast/DecoratorList.java  |    26 +
 .../com/semmle/ts/ast/EnumDeclaration.java    |    63 +
 .../src/com/semmle/ts/ast/EnumMember.java     |    46 +
 .../ts/ast/ExportAsNamespaceDeclaration.java  |    28 +
 .../semmle/ts/ast/ExportWholeDeclaration.java |    24 +
 .../ts/ast/ExpressionWithTypeArguments.java   |    42 +
 .../ts/ast/ExternalModuleDeclaration.java     |    35 +
 .../ts/ast/ExternalModuleReference.java       |    24 +
 .../com/semmle/ts/ast/FunctionTypeExpr.java   |    29 +
 .../com/semmle/ts/ast/GenericTypeExpr.java    |    33 +
 .../ts/ast/GlobalAugmentationDeclaration.java |    28 +
 .../com/semmle/ts/ast/INodeWithSymbol.java    |    17 +
 .../com/semmle/ts/ast/ITypeExpression.java    |    15 +
 .../src/com/semmle/ts/ast/ITypedAstNode.java  |    17 +
 .../src/com/semmle/ts/ast/ImportTypeExpr.java |    26 +
 .../semmle/ts/ast/ImportWholeDeclaration.java |    34 +
 .../semmle/ts/ast/IndexedAccessTypeExpr.java  |    31 +
 .../src/com/semmle/ts/ast/InferTypeExpr.java  |    25 +
 .../semmle/ts/ast/InterfaceDeclaration.java   |    65 +
 .../com/semmle/ts/ast/InterfaceTypeExpr.java  |    28 +
 .../semmle/ts/ast/IntersectionTypeExpr.java   |    29 +
 .../src/com/semmle/ts/ast/IsTypeExpr.java     |    32 +
 .../src/com/semmle/ts/ast/KeyofTypeExpr.java  |    25 +
 .../com/semmle/ts/ast/KeywordTypeExpr.java    |    32 +
 .../src/com/semmle/ts/ast/MappedTypeExpr.java |    35 +
 .../semmle/ts/ast/NamespaceDeclaration.java   |    62 +
 .../com/semmle/ts/ast/NonNullAssertion.java   |    26 +
 .../com/semmle/ts/ast/OptionalTypeExpr.java   |    26 +
 .../semmle/ts/ast/ParenthesizedTypeExpr.java  |    25 +
 .../src/com/semmle/ts/ast/RestTypeExpr.java   |    26 +
 .../src/com/semmle/ts/ast/TupleTypeExpr.java  |    27 +
 .../semmle/ts/ast/TypeAliasDeclaration.java   |    53 +
 .../src/com/semmle/ts/ast/TypeAssertion.java  |    42 +
 .../src/com/semmle/ts/ast/TypeExpression.java |    26 +
 .../src/com/semmle/ts/ast/TypeParameter.java  |    53 +
 .../src/com/semmle/ts/ast/TypeofTypeExpr.java |    26 +
 .../src/com/semmle/ts/ast/UnionTypeExpr.java  |    26 +
 .../semmle/ts/extractor/TypeExtractor.java    |   247 +
 .../com/semmle/ts/extractor/TypeTable.java    |   113 +
 .../extractor/tests/cfg/input/classexpr1.js   |     1 +
 .../extractor/tests/cfg/input/classexpr2.js   |     1 +
 .../extractor/tests/cfg/input/classexpr3.js   |     1 +
 .../extractor/tests/cfg/input/classexpr4.js   |     1 +
 .../extractor/tests/cfg/input/fields.js       |    18 +
 javascript/extractor/tests/cfg/input/seq.js   |     1 +
 .../tests/cfg/input/short-circuit.js          |     2 +
 .../extractor/tests/cfg/input/ternary.js      |     1 +
 javascript/extractor/tests/cfg/input/tst.js   |    36 +
 javascript/extractor/tests/cfg/options.json   |     3 +
 .../tests/cfg/output/trap/classexpr1.js.trap  |   121 +
 .../tests/cfg/output/trap/classexpr2.js.trap  |   143 +
 .../tests/cfg/output/trap/classexpr3.js.trap  |   182 +
 .../tests/cfg/output/trap/classexpr4.js.trap  |   204 +
 .../tests/cfg/output/trap/fields.js.trap      |   750 ++
 .../tests/cfg/output/trap/seq.js.trap         |   196 +
 .../cfg/output/trap/short-circuit.js.trap     |   241 +
 .../tests/cfg/output/trap/ternary.js.trap     |   218 +
 .../tests/cfg/output/trap/tst.js.trap         |  1549 +++
 .../tests/comments/input/comments.js          |     5 +
 .../tests/comments/input/empty_comment.js     |     1 +
 .../extractor/tests/comments/input/jsdoc.js   |    17 +
 .../comments/output/trap/comments.js.trap     |    83 +
 .../output/trap/empty_comment.js.trap         |    42 +
 .../tests/comments/output/trap/jsdoc.js.trap  |   303 +
 .../tests/default-encoding/input/latin1.js    |     1 +
 .../tests/default-encoding/options.json       |     3 +
 .../output/trap/latin1.js.trap                |   139 +
 .../tests/encoding/input/surrogates.js        |    13 +
 .../extractor/tests/encoding/input/unicode.js |     1 +
 .../encoding/output/trap/surrogates.js.trap   |   453 +
 .../encoding/output/trap/unicode.js.trap      |    50 +
 .../extractor/tests/errors/input/empty.js     |     0
 .../extractor/tests/errors/input/errors.js    |     1 +
 .../tests/errors/input/incomplete.js          |     1 +
 .../extractor/tests/errors/input/json.js      |     3 +
 .../tests/errors/input/weirdassign.js         |     1 +
 .../tests/errors/output/trap/empty.js.trap    |    28 +
 .../tests/errors/output/trap/errors.js.trap   |    28 +
 .../errors/output/trap/incomplete.js.trap     |    27 +
 .../tests/errors/output/trap/json.js.trap     |    24 +
 .../errors/output/trap/weirdassign.js.trap    |    28 +
 .../input/array_pattern_with_default.js       |     1 +
 .../es2015/input/array_pattern_with_rest.js   |     4 +
 .../extractor/tests/es2015/input/arrowfn.js   |     3 +
 .../tests/es2015/input/class_accessors.js     |     8 +
 .../tests/es2015/input/class_ctor.js          |     5 +
 .../tests/es2015/input/class_extends.js       |     1 +
 .../tests/es2015/input/class_extends2.js      |     1 +
 .../tests/es2015/input/class_method.js        |     5 +
 .../tests/es2015/input/class_static.js        |     5 +
 .../extractor/tests/es2015/input/classdecl.js |     1 +
 .../extractor/tests/es2015/input/classexpr.js |     1 +
 .../tests/es2015/input/classexpr2.js          |     1 +
 .../es2015/input/complex_array_pattern.js     |     1 +
 .../es2015/input/complex_object_pattern.js    |     1 +
 .../extractor/tests/es2015/input/const.js     |     1 +
 .../tests/es2015/input/defaultargs.js         |     1 +
 .../tests/es2015/input/delegating_yield.js    |     3 +
 .../tests/es2015/input/destructuring.js       |    13 +
 .../extractor/tests/es2015/input/export1.js   |     1 +
 .../extractor/tests/es2015/input/export10.js  |     1 +
 .../extractor/tests/es2015/input/export11.js  |     1 +
 .../extractor/tests/es2015/input/export2.js   |     1 +
 .../extractor/tests/es2015/input/export3.js   |     1 +
 .../extractor/tests/es2015/input/export4.js   |     1 +
 .../extractor/tests/es2015/input/export5.js   |     2 +
 .../extractor/tests/es2015/input/export6.js   |     1 +
 .../extractor/tests/es2015/input/export7.js   |     1 +
 .../extractor/tests/es2015/input/export8.js   |     2 +
 .../extractor/tests/es2015/input/export9.js   |     1 +
 .../extractor/tests/es2015/input/forof.js     |     7 +
 .../extractor/tests/es2015/input/import1.js   |     1 +
 .../extractor/tests/es2015/input/import2.js   |     1 +
 .../extractor/tests/es2015/input/import3.js   |     1 +
 .../extractor/tests/es2015/input/import4.js   |     1 +
 .../extractor/tests/es2015/input/import5.js   |     1 +
 .../extractor/tests/es2015/input/import6.js   |     1 +
 .../extractor/tests/es2015/input/import7.js   |     3 +
 .../extractor/tests/es2015/input/let.js       |    12 +
 .../extractor/tests/es2015/input/let2.js      |     1 +
 .../tests/es2015/input/nested_import.js       |     5 +
 .../tests/es2015/input/new_target.js          |     3 +
 .../tests/es2015/input/no-substitution.js     |     1 +
 .../tests/es2015/input/nullMethodName.js      |     3 +
 .../tests/es2015/input/odasa-2593.js          |     4 +
 .../tests/es2015/input/properties.js          |     6 +
 .../input/property_pattern_with_default.js    |     1 +
 .../extractor/tests/es2015/input/restparms.js |     2 +
 .../tests/es2015/input/restparms2.js          |     2 +
 .../tests/es2015/input/spreadelement.js       |     2 +
 .../tests/es2015/input/super_call.js          |     5 +
 .../tests/es2015/input/super_ctor.js          |     5 +
 .../extractor/tests/es2015/input/templates.js |     8 +
 .../es2015/input/unknown_meta_property.js     |     3 +
 .../extractor/tests/es2015/input/yield.js     |     5 +
 .../extractor/tests/es2015/input/yield2.js    |     3 +
 .../trap/array_pattern_with_default.js.trap   |   128 +
 .../trap/array_pattern_with_rest.js.trap      |   252 +
 .../tests/es2015/output/trap/arrowfn.js.trap  |   543 +
 .../output/trap/class_accessors.js.trap       |   475 +
 .../es2015/output/trap/class_ctor.js.trap     |   265 +
 .../es2015/output/trap/class_extends.js.trap  |   178 +
 .../es2015/output/trap/class_extends2.js.trap |   296 +
 .../es2015/output/trap/class_method.js.trap   |   270 +
 .../es2015/output/trap/class_static.js.trap   |   252 +
 .../es2015/output/trap/classdecl.js.trap      |   117 +
 .../es2015/output/trap/classexpr.js.trap      |   141 +
 .../es2015/output/trap/classexpr2.js.trap     |   119 +
 .../output/trap/complex_array_pattern.js.trap |   148 +
 .../trap/complex_object_pattern.js.trap       |   172 +
 .../tests/es2015/output/trap/const.js.trap    |    93 +
 .../es2015/output/trap/defaultargs.js.trap    |   174 +
 .../output/trap/delegating_yield.js.trap      |   184 +
 .../es2015/output/trap/destructuring.js.trap  |   885 ++
 .../tests/es2015/output/trap/export1.js.trap  |   107 +
 .../tests/es2015/output/trap/export10.js.trap |   161 +
 .../tests/es2015/output/trap/export11.js.trap |   121 +
 .../tests/es2015/output/trap/export2.js.trap  |   134 +
 .../tests/es2015/output/trap/export3.js.trap  |   139 +
 .../tests/es2015/output/trap/export4.js.trap  |   126 +
 .../tests/es2015/output/trap/export5.js.trap  |   242 +
 .../tests/es2015/output/trap/export6.js.trap  |    77 +
 .../tests/es2015/output/trap/export7.js.trap  |   149 +
 .../tests/es2015/output/trap/export8.js.trap  |   131 +
 .../tests/es2015/output/trap/export9.js.trap  |   173 +
 .../tests/es2015/output/trap/forof.js.trap    |   468 +
 .../tests/es2015/output/trap/import1.js.trap  |   100 +
 .../tests/es2015/output/trap/import2.js.trap  |   116 +
 .../tests/es2015/output/trap/import3.js.trap  |   128 +
 .../tests/es2015/output/trap/import4.js.trap  |   162 +
 .../tests/es2015/output/trap/import5.js.trap  |   108 +
 .../tests/es2015/output/trap/import6.js.trap  |    66 +
 .../tests/es2015/output/trap/import7.js.trap  |   228 +
 .../tests/es2015/output/trap/let.js.trap      |   729 ++
 .../tests/es2015/output/trap/let2.js.trap     |    99 +
 .../es2015/output/trap/nested_import.js.trap  |   353 +
 .../es2015/output/trap/new_target.js.trap     |   180 +
 .../output/trap/no-substitution.js.trap       |    64 +
 .../es2015/output/trap/nullMethodName.js.trap |   236 +
 .../es2015/output/trap/odasa-2593.js.trap     |   204 +
 .../es2015/output/trap/properties.js.trap     |   431 +
 .../property_pattern_with_default.js.trap     |   153 +
 .../es2015/output/trap/restparms.js.trap      |   146 +
 .../es2015/output/trap/restparms2.js.trap     |    35 +
 .../es2015/output/trap/spreadelement.js.trap  |   196 +
 .../es2015/output/trap/super_call.js.trap     |   374 +
 .../es2015/output/trap/super_ctor.js.trap     |   250 +
 .../es2015/output/trap/templates.js.trap      |   742 ++
 .../output/trap/unknown_meta_property.js.trap |   168 +
 .../tests/es2015/output/trap/yield.js.trap    |   317 +
 .../tests/es2015/output/trap/yield2.js.trap   |   148 +
 .../extractor/tests/es2016/input/exp.js       |     2 +
 .../extractor/tests/es2016/input/usestrict.js |     1 +
 .../tests/es2016/output/trap/exp.js.trap      |   126 +
 .../es2016/output/trap/usestrict.js.trap      |   164 +
 .../tests/es2017/input/async-await.js         |     7 +
 .../tests/es2017/input/export-async-1.js      |     1 +
 .../tests/es2017/input/export-async-2.js      |     1 +
 .../tests/es2017/input/invalid-async-fn.js    |     1 +
 .../es2017/input/shorthand-prop-async.js      |     1 +
 .../extractor/tests/es2017/options.json       |     3 +
 .../es2017/output/trap/async-await.js.trap    |   353 +
 .../es2017/output/trap/export-async-1.js.trap |   148 +
 .../es2017/output/trap/export-async-2.js.trap |   135 +
 .../output/trap/invalid-async-fn.js.trap      |   145 +
 .../output/trap/shorthand-prop-async.js.trap  |   110 +
 .../extractor/tests/es2018/input/templates.js |    12 +
 .../extractor/tests/es2018/options.json       |     3 +
 .../es2018/output/trap/templates.js.trap      |   804 ++
 .../tests/esnext/input/async-generators.js    |     6 +
 .../esnext/input/catchGuardAndNoBinding.js    |    10 +
 .../tests/esnext/input/catchNoBinding.js      |     5 +
 .../tests/esnext/input/dynamic-import.js      |     3 +
 .../extractor/tests/esnext/input/fields.js    |    11 +
 .../extractor/tests/esnext/options.json       |     3 +
 .../output/trap/async-generators.js.trap      |   333 +
 .../trap/catchGuardAndNoBinding.js.trap       |   642 +
 .../esnext/output/trap/catchNoBinding.js.trap |   270 +
 .../esnext/output/trap/dynamic-import.js.trap |   363 +
 .../tests/esnext/output/trap/fields.js.trap   |   540 +
 .../tests/excludes/input/.jshintignore        |     2 +
 .../extractor/tests/excludes/input/a.js       |     1 +
 .../extractor/tests/excludes/input/baz/a.js   |     1 +
 .../extractor/tests/excludes/input/f/bar.js   |     1 +
 .../tests/excludes/input/f/empty.json         |     1 +
 .../extractor/tests/excludes/input/f/foo.js   |     1 +
 .../extractor/tests/excludes/options.json     |     5 +
 .../tests/excludes/output/trap/a.js.trap      |    50 +
 .../excludes/output/trap/empty.json.trap      |    18 +
 .../extractor/tests/exprs/input/assignment.js |    12 +
 .../extractor/tests/exprs/input/binary.js     |    15 +
 .../extractor/tests/exprs/input/comparison.js |     8 +
 .../extractor/tests/exprs/input/fnnesting.js  |     1 +
 .../extractor/tests/exprs/input/others.js     |     3 +
 .../extractor/tests/exprs/input/parens.js     |     1 +
 .../extractor/tests/exprs/input/primaries.js  |    30 +
 .../extractor/tests/exprs/input/regexp.js     |    44 +
 .../extractor/tests/exprs/input/unary.js      |     7 +
 .../extractor/tests/exprs/input/update.js     |     4 +
 .../exprs/output/trap/assignment.js.trap      |   684 ++
 .../tests/exprs/output/trap/binary.js.trap    |   840 ++
 .../exprs/output/trap/comparison.js.trap      |   456 +
 .../tests/exprs/output/trap/fnnesting.js.trap |   154 +
 .../tests/exprs/output/trap/others.js.trap    |   225 +
 .../tests/exprs/output/trap/parens.js.trap    |    91 +
 .../tests/exprs/output/trap/primaries.js.trap |  1646 +++
 .../tests/exprs/output/trap/regexp.js.trap    |  2250 ++++
 .../tests/exprs/output/trap/unary.js.trap     |   365 +
 .../tests/exprs/output/trap/update.js.trap    |   204 +
 .../extractor/tests/extensions/input/tst.es6  |     1 +
 .../extractor/tests/extensions/input/tst2.es  |     1 +
 .../tests/extensions/output/trap/tst.es6.trap |   123 +
 .../tests/extensions/output/trap/tst2.es.trap |   123 +
 .../extractor/tests/externs/input/Point.js    |    17 +
 .../extractor/tests/externs/options.json      |     3 +
 .../tests/externs/output/trap/Point.js.trap   |   944 ++
 .../flow/input/anonFunctionOptionalParm.js    |     1 +
 .../flow/input/anonFunctionReturnType.js      |     1 +
 .../flow/input/anonFunctionWithoutParens.js   |     1 +
 .../extractor/tests/flow/input/anonIndexer.js |     1 +
 .../extractor/tests/flow/input/async.js       |     1 +
 .../tests/flow/input/atAtIteratorProp.js      |     3 +
 .../tests/flow/input/complexParamTypes.js     |     1 +
 .../tests/flow/input/complexParamTypes2.js    |     3 +
 .../tests/flow/input/declareExport.js         |     4 +
 .../tests/flow/input/declareModuleExports.js  |     4 +
 .../tests/flow/input/exportOpaqueType.js      |     1 +
 .../extractor/tests/flow/input/importType.js  |     2 +
 .../tests/flow/input/methodTypeParams.js      |     5 +
 .../tests/flow/input/objectTypeSpread.js      |     2 +
 .../extractor/tests/flow/input/optParms.js    |     2 +
 .../tests/flow/input/parmAnonFunctionType.js  |     3 +
 .../tests/flow/input/qualifiedInterface.js    |     1 +
 javascript/extractor/tests/flow/input/tst.js  |    22 +
 .../extractor/tests/flow/input/variance.js    |     7 +
 javascript/extractor/tests/flow/options.json  |     3 +
 .../trap/anonFunctionOptionalParm.js.trap     |   166 +
 .../trap/anonFunctionReturnType.js.trap       |   173 +
 .../trap/anonFunctionWithoutParens.js.trap    |    90 +
 .../flow/output/trap/anonIndexer.js.trap      |   103 +
 .../tests/flow/output/trap/async.js.trap      |   194 +
 .../flow/output/trap/atAtIteratorProp.js.trap |   108 +
 .../output/trap/complexParamTypes.js.trap     |   195 +
 .../output/trap/complexParamTypes2.js.trap    |   148 +
 .../flow/output/trap/declareExport.js.trap    |   186 +
 .../output/trap/declareModuleExports.js.trap  |   115 +
 .../flow/output/trap/exportOpaqueType.js.trap |    88 +
 .../tests/flow/output/trap/importType.js.trap |   195 +
 .../flow/output/trap/methodTypeParams.js.trap |   262 +
 .../flow/output/trap/objectTypeSpread.js.trap |   148 +
 .../tests/flow/output/trap/optParms.js.trap   |   299 +
 .../output/trap/parmAnonFunctionType.js.trap  |   240 +
 .../output/trap/qualifiedInterface.js.trap    |    78 +
 .../tests/flow/output/trap/tst.js.trap        |   731 ++
 .../tests/flow/output/trap/variance.js.trap   |   255 +
 .../extractor/tests/functionbind/input/tst.js |     5 +
 .../extractor/tests/functionbind/options.json |     3 +
 .../functionbind/output/trap/tst.js.trap      |   490 +
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 .../input/text-examples.html                  |    25 +
 .../tests/html-text-extraction/options.json   |     3 +
 .../output/trap/text-examples.html.trap       |   242 +
 .../extractor/tests/html/input/doctype.html   |     1 +
 .../tests/html/input/empty_script.html        |     6 +
 .../extractor/tests/html/input/entities.html  |     8 +
 .../extractor/tests/html/input/module.html    |    11 +
 javascript/extractor/tests/html/input/q.html  |     8 +
 .../extractor/tests/html/input/tst.html       |    18 +
 .../extractor/tests/html/input/tst.xhtml      |    12 +
 .../extractor/tests/html/input/tst2.html      |    10 +
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 .../tests/html/output/trap/doctype.html.trap  |    12 +
 .../html/output/trap/empty_script.html.trap   |    37 +
 .../tests/html/output/trap/entities.html.trap |   144 +
 .../tests/html/output/trap/module.html.trap   |   220 +
 .../tests/html/output/trap/q.html.trap        |    47 +
 .../tests/html/output/trap/tst.html.trap      |   455 +
 .../tests/html/output/trap/tst.xhtml.trap     |   118 +
 .../tests/html/output/trap/tst2.html.trap     |   362 +
 .../tests/html/output/trap/tst2.xhtml.trap    |    37 +
 .../extractor/tests/jscript/input/tst.js      |     1 +
 .../extractor/tests/jscript/options.json      |     3 +
 .../tests/jscript/output/trap/tst.js.trap     |   181 +
 .../extractor/tests/json/input/array.json     |     1 +
 .../extractor/tests/json/input/comments.json  |     5 +
 .../tests/json/input/duplicate-keys.json      |     4 +
 .../extractor/tests/json/input/empty.json     |     0
 .../extractor/tests/json/input/error.json     |     1 +
 .../extractor/tests/json/input/f/ignored.json |     1 +
 .../extractor/tests/json/input/invalid.json   |     3 +
 .../extractor/tests/json/input/neg.json       |     1 +
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 .../tests/json/output/trap/comments.json.trap |    32 +
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 .../tests/json/output/trap/empty.json.trap    |    15 +
 .../tests/json/output/trap/error.json.trap    |    15 +
 .../tests/json/output/trap/invalid.json.trap  |    15 +
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 javascript/extractor/tests/jsx/input/err1.jsx |     1 +
 javascript/extractor/tests/jsx/input/err2.jsx |     1 +
 javascript/extractor/tests/jsx/input/err3.jsx |     1 +
 javascript/extractor/tests/jsx/input/err4.jsx |     1 +
 javascript/extractor/tests/jsx/input/tst.js   |     5 +
 javascript/extractor/tests/jsx/input/tst.jsx  |     0
 javascript/extractor/tests/jsx/input/tst2.js  |     1 +
 .../tests/jsx/output/trap/err1.jsx.trap       |    30 +
 .../tests/jsx/output/trap/err2.jsx.trap       |    30 +
 .../tests/jsx/output/trap/err3.jsx.trap       |    30 +
 .../tests/jsx/output/trap/err4.jsx.trap       |    30 +
 .../tests/jsx/output/trap/tst.js.trap         |   752 ++
 .../tests/jsx/output/trap/tst.jsx.trap        |    28 +
 .../tests/jsx/output/trap/tst2.js.trap        |   100 +
 .../mozilla/input/array_comprehensions.js     |     4 +
 .../extractor/tests/mozilla/input/foreach.js  |     8 +
 .../mozilla/input/generator_expressions.js    |     4 +
 .../tests/mozilla/input/guardedCatch.js       |     9 +
 .../extractor/tests/mozilla/input/letExpr.js  |     5 +
 .../extractor/tests/mozilla/input/letStmt.js  |     7 +
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 .../mozilla/input/new-with-trailing-arg.js    |     6 +
 .../tests/mozilla/input/odasa-2593.js         |     4 +
 .../extractor/tests/mozilla/options.json      |     3 +
 .../output/trap/array_comprehensions.js.trap  |   701 ++
 .../tests/mozilla/output/trap/foreach.js.trap |   546 +
 .../output/trap/generator_expressions.js.trap |   701 ++
 .../mozilla/output/trap/guardedCatch.js.trap  |   568 +
 .../tests/mozilla/output/trap/letExpr.js.trap |   485 +
 .../tests/mozilla/output/trap/letStmt.js.trap |   516 +
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 .../mozilla/output/trap/odasa-2593.js.trap    |   209 +
 .../extractor/tests/node/input/constlet.js    |     2 +
 javascript/extractor/tests/node/input/empty   |     0
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 .../extractor/tests/node/input/f/package.json |     1 +
 javascript/extractor/tests/node/input/g/hello |     2 +
 .../extractor/tests/node/input/tst.html       |     8 +
 javascript/extractor/tests/node/input/tst.js  |     4 +
 javascript/extractor/tests/node/input/tst.mjs |     1 +
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 .../tests/node/output/trap/constlet.js.trap   |   179 +
 .../tests/node/output/trap/hello.trap         |   148 +
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 .../tests/node/output/trap/tst.js.trap        |   354 +
 .../tests/node/output/trap/tst.mjs.trap       |    84 +
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 .../extractor/tests/rcfiles/input/.babelrc    |     3 +
 .../extractor/tests/rcfiles/input/.eslintrc   |     3 +
 .../extractor/tests/rcfiles/input/.npmrc      |     1 +
 .../tests/rcfiles/output/trap/.babelrc.trap   |    22 +
 .../tests/rcfiles/output/trap/.eslintrc.trap  |    22 +
 .../extractor/tests/regexp/input/es2018.js    |     5 +
 .../tests/regexp/input/nonstandard.js         |     1 +
 .../tests/regexp/input/odasa-1934.js          |     7 +
 .../tests/regexp/output/trap/es2018.js.trap   |   257 +
 .../regexp/output/trap/nonstandard.js.trap    |    86 +
 .../regexp/output/trap/odasa-1934.js.trap     |   Bin 0 -> 11003 bytes
 .../extractor/tests/restprops/input/tst.js    |     1 +
 .../extractor/tests/restprops/options.json    |     3 +
 .../tests/restprops/output/trap/tst.js.trap   |   173 +
 .../extractor/tests/shebang/input/tst.html    |    10 +
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 .../tests/shebang/output/trap/tst.html.trap   |    67 +
 .../tests/shebang/output/trap/tst.js.trap     |   122 +
 .../tests/stmts/input/conditionals.js         |    12 +
 .../tests/stmts/input/forvardefault.js        |     3 +
 .../extractor/tests/stmts/input/functions.js  |    13 +
 .../extractor/tests/stmts/input/loops.js      |    21 +
 .../extractor/tests/stmts/input/others.js     |     4 +
 .../extractor/tests/stmts/input/switch.js     |    17 +
 .../extractor/tests/stmts/input/switch2.js    |     9 +
 .../tests/stmts/input/trivial-switch.js       |     1 +
 javascript/extractor/tests/stmts/input/try.js |     5 +
 .../stmts/output/trap/conditionals.js.trap    |   356 +
 .../stmts/output/trap/forvardefault.js.trap   |   285 +
 .../tests/stmts/output/trap/functions.js.trap |   671 +
 .../tests/stmts/output/trap/loops.js.trap     |  1070 ++
 .../tests/stmts/output/trap/others.js.trap    |   203 +
 .../tests/stmts/output/trap/switch.js.trap    |   583 +
 .../tests/stmts/output/trap/switch2.js.trap   |   343 +
 .../stmts/output/trap/trivial-switch.js.trap  |    83 +
 .../tests/stmts/output/trap/try.js.trap       |   354 +
 .../tests/strictmode/input/assignargs.js      |     4 +
 .../extractor/tests/strictmode/input/tst.js   |     2 +
 .../strictmode/output/trap/assignargs.js.trap |   219 +
 .../tests/strictmode/output/trap/tst.js.trap  |    73 +
 .../tests/ts-full/input/tsconfig.json         |     1 +
 .../extractor/tests/ts-full/input/tst.ts      |    15 +
 .../ts-full/output/trap/tsconfig.json.trap    |  3086 +++++
 .../tests/ts-full/output/trap/tst.ts.trap     |   917 ++
 .../tests/ts/input/arrayBindingPattern.ts     |     1 +
 .../extractor/tests/ts/input/badimport.ts     |     1 +
 .../tests/ts/input/bindingpattern.ts          |     1 +
 javascript/extractor/tests/ts/input/bom.ts    |     1 +
 .../extractor/tests/ts/input/classes.ts       |     2 +
 .../extractor/tests/ts/input/comments.ts      |     4 +
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 .../extractor/tests/ts/input/decorators.ts    |    14 +
 .../extractor/tests/ts/input/emptydecls.ts    |     1 +
 javascript/extractor/tests/ts/input/enum.ts   |    18 +
 javascript/extractor/tests/ts/input/export.ts |     5 +
 .../extractor/tests/ts/input/export2.ts       |     1 +
 .../tests/ts/input/exportasnamespace.d.ts     |     2 +
 .../extractor/tests/ts/input/exportassign.ts  |     1 +
 javascript/extractor/tests/ts/input/exprs.ts  |     5 +
 .../tests/ts/input/externalmodule.ts          |     9 +
 .../tests/ts/input/functiondecorators.ts      |    15 +
 javascript/extractor/tests/ts/input/hello.ts  |     5 +
 .../extractor/tests/ts/input/importExport.ts  |     3 +
 .../extractor/tests/ts/input/importassign.ts  |     1 +
 .../extractor/tests/ts/input/interfaces.ts    |    11 +
 .../tests/ts/input/invalidModuleSpecifier.ts  |     1 +
 .../tests/ts/input/klee-binary-file.ts        |   Bin 0 -> 1412 bytes
 javascript/extractor/tests/ts/input/let.ts    |     3 +
 .../tests/ts/input/mappedTypeModifiers.ts     |    11 +
 .../tests/ts/input/mpeg-stream-fragment.ts    |   Bin 0 -> 376 bytes
 .../extractor/tests/ts/input/namespaces.ts    |     7 +
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 javascript/extractor/tests/ts/input/nobody.ts |    29 +
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 javascript/extractor/tests/ts/input/regexp.ts |     1 +
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 .../extractor/tests/ts/input/tryfinally.ts    |     7 +
 javascript/extractor/tests/ts/input/tsx.tsx   |     4 +
 .../tests/ts/input/typeannotations.ts         |    65 +
 .../extractor/tests/ts/input/unicode.ts       |     3 +
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 .../tests/ts/input/uninstantiatedNamespace.ts |    25 +
 .../tests/ts/input/xmlfile-utf16be.ts         |   Bin 0 -> 62 bytes
 .../tests/ts/input/xmlfile-utf16le.ts         |   Bin 0 -> 62 bytes
 .../extractor/tests/ts/input/xmlfile.ts       |     2 +
 javascript/extractor/tests/ts/options.json    |     3 +
 .../output/trap/arrayBindingPattern.ts.trap   |   163 +
 .../tests/ts/output/trap/badimport.ts.trap    |    30 +
 .../ts/output/trap/bindingpattern.ts.trap     |   176 +
 .../tests/ts/output/trap/bom.ts.trap          |    53 +
 .../tests/ts/output/trap/classes.ts.trap      |   245 +
 .../tests/ts/output/trap/comments.ts.trap     |   126 +
 .../ts/output/trap/conditionalTypes.ts.trap   | 10205 ++++++++++++++++
 .../tests/ts/output/trap/ctordecl.ts.trap     |   317 +
 .../tests/ts/output/trap/declareClass.ts.trap |   111 +
 .../tests/ts/output/trap/decorators.ts.trap   |   664 +
 .../tests/ts/output/trap/emptydecls.ts.trap   |    30 +
 .../tests/ts/output/trap/enum.ts.trap         |  1112 ++
 .../tests/ts/output/trap/export.ts.trap       |   327 +
 .../tests/ts/output/trap/export2.ts.trap      |    75 +
 .../output/trap/exportasnamespace.d.ts.trap   |   149 +
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 .../tests/ts/output/trap/exprs.ts.trap        |   349 +
 .../ts/output/trap/externalmodule.ts.trap     |   371 +
 .../ts/output/trap/functiondecorators.ts.trap |  1364 +++
 .../tests/ts/output/trap/hello.ts.trap        |   326 +
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 .../tests/ts/output/trap/interfaces.ts.trap   |   444 +
 .../trap/invalidModuleSpecifier.ts.trap       |    28 +
 .../tests/ts/output/trap/let.ts.trap          |   215 +
 .../output/trap/mappedTypeModifiers.ts.trap   |  1186 ++
 .../tests/ts/output/trap/namespaces.ts.trap   |   353 +
 .../ts/output/trap/nestedNamespace.ts.trap    |   471 +
 .../tests/ts/output/trap/nobody.ts.trap       |  1212 ++
 .../output/trap/objectLiteralAccessor.ts.trap |   309 +
 .../tests/ts/output/trap/omitted.ts.trap      |    86 +
 .../tests/ts/output/trap/regexp.ts.trap       |    56 +
 .../tests/ts/output/trap/templates.ts.trap    |   142 +
 .../ts/output/trap/thisparameter.ts.trap      |   759 ++
 .../tests/ts/output/trap/tryfinally.ts.trap   |   285 +
 .../tests/ts/output/trap/tsx.tsx.trap         |   376 +
 .../ts/output/trap/typeannotations.ts.trap    |  4820 ++++++++
 .../tests/ts/output/trap/unicode.ts.trap      |    58 +
 .../tests/ts/output/trap/unicodeId.ts.trap    |    93 +
 .../trap/uninstantiatedNamespace.ts.trap      |   998 ++
 javascript/extractor/tests/v8/input/tst.js    |     2 +
 javascript/extractor/tests/v8/options.json    |     3 +
 .../tests/v8/output/trap/tst.js.trap          |   196 +
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 .../tests/variables/output/trap/try.js.trap   |   217 +
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 .../extractor/tests/yaml/input/cyclic.yaml    |     3 +
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 .../tests/yaml/output/trap/merge.yaml.trap    |    74 +
 .../tests/yaml/output/trap/tst.yml.trap       |   277 +
 javascript/extractor/util/dotify-cfg.sh       |    22 +
 992 files changed, 134506 insertions(+)
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 create mode 100644 javascript/extractor/tests/variables/output/trap/variables.js.trap
 create mode 100644 javascript/extractor/tests/vue/input/test.vue
 create mode 100644 javascript/extractor/tests/vue/output/trap/test.vue.trap
 create mode 100644 javascript/extractor/tests/yaml/input/cyclic.yaml
 create mode 100644 javascript/extractor/tests/yaml/input/merge.yaml
 create mode 100644 javascript/extractor/tests/yaml/input/tst.yml
 create mode 100644 javascript/extractor/tests/yaml/output/trap/cyclic.yaml.trap
 create mode 100644 javascript/extractor/tests/yaml/output/trap/merge.yaml.trap
 create mode 100644 javascript/extractor/tests/yaml/output/trap/tst.yml.trap
 create mode 100755 javascript/extractor/util/dotify-cfg.sh

diff --git a/javascript/extractor/.classpath b/javascript/extractor/.classpath
new file mode 100644
index 00000000000..73c9db8bc49
--- /dev/null
+++ b/javascript/extractor/.classpath
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry excluding=".git" kind="src" path="lib/esregex"/>
+	<classpathentry excluding=".git" kind="src" path="lib/external/doctrine"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/util-shared"/>
+	<classpathentry combineaccessrules="false" kind="src" path="/util-java7"/>
+	<classpathentry kind="lib" path="/resources/lib/js.jar" sourcepath="/resources/lib/js-src.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/jericho-html-3.3.jar" sourcepath="/resources/lib/jericho-html-3.3-sources.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/junit-4.11.jar" sourcepath="/resources/lib/junit-4.11-sources.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/gson-2.2.2-jar.jar" sourcepath="/resources/lib/gson-2.2.2-source.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/hamcrest-core-1.3.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/snakeyaml-1.18.jar" sourcepath="/resources/lib/snakeyaml-1.18-sources.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/slf4j-api-1.7.25.jar" sourcepath="/resources/lib/slf4j-api-1.7.25-sources.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/logback-classic-1.2.3.jar" sourcepath="/resources/lib/logback-classic-1.2.3-sources.jar"/>
+	<classpathentry kind="lib" path="/resources/lib/logback-core-1.2.3.jar" sourcepath="/resources/lib/logback-core-1.2.3-sources.jar"/>
+	<classpathentry kind="src" path="/util-java8"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/javascript/extractor/.gitignore b/javascript/extractor/.gitignore
new file mode 100644
index 00000000000..7167a4acbb5
--- /dev/null
+++ b/javascript/extractor/.gitignore
@@ -0,0 +1,2 @@
+node_modules
+/bin
diff --git a/javascript/extractor/.project b/javascript/extractor/.project
new file mode 100644
index 00000000000..b653bbd47da
--- /dev/null
+++ b/javascript/extractor/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+    <name>extractor-javascript</name>
+    <comment></comment>
+    <projects>
+    </projects>
+    <buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+    </buildSpec>
+    <natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+    </natures>
+</projectDescription>
diff --git a/javascript/extractor/.settings/org.eclipse.core.resources.prefs b/javascript/extractor/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 00000000000..c24fa5440e5
--- /dev/null
+++ b/javascript/extractor/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,3 @@
+eclipse.preferences.version=1
+encoding//tests/ts/input/xmlfile-utf16be.ts=UTF-16BE
+encoding//tests/ts/input/xmlfile-utf16le.ts=UTF-16LE
diff --git a/javascript/extractor/README.md b/javascript/extractor/README.md
new file mode 100644
index 00000000000..9f6d4190a33
--- /dev/null
+++ b/javascript/extractor/README.md
@@ -0,0 +1,9 @@
+# JavaScript extractor
+
+This directory contains the source code of the JavaScript extractor. The extractor depends on various libraries that are not currently bundled with the source code, so at present it cannot be built in isolation.
+
+The extractor consists of a parser for the latest version of ECMAScript, including a few proposed and historic extensions (see `src/com/semmle/jcorn`), classes for representing JavaScript and TypeScript ASTs (`src/com/semmle/js/ast` and `src/com/semmle/ts/ast`), and various other bits of functionality. Historically, the main entry point of the JavaScript extractor has been `com.semmle.js.extractor.Main`. However, this class is slowly being phased out in favour of `com.semmle.js.extractor.AutoBuild`, which is the entry point used by LGTM.
+
+## License
+
+Like the LGTM queries, the JavaScript extractor is licensed under [Apache License 2.0](LICENSE) by [Semmle](https://semmle.com).
diff --git a/javascript/extractor/lib/esregex/.gitignore b/javascript/extractor/lib/esregex/.gitignore
new file mode 100644
index 00000000000..b512c09d476
--- /dev/null
+++ b/javascript/extractor/lib/esregex/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/javascript/extractor/lib/esregex/README.md b/javascript/extractor/lib/esregex/README.md
new file mode 100644
index 00000000000..c0d5763ad7d
--- /dev/null
+++ b/javascript/extractor/lib/esregex/README.md
@@ -0,0 +1,4 @@
+esregex
+=======
+
+Parser for ECMAScript 2018 regular expressions.
diff --git a/javascript/extractor/lib/esregex/package.json b/javascript/extractor/lib/esregex/package.json
new file mode 100644
index 00000000000..da9170e6f91
--- /dev/null
+++ b/javascript/extractor/lib/esregex/package.json
@@ -0,0 +1,13 @@
+{
+    "name": "esregex",
+    "version": "1.0.0",
+    "author": "Semmle",
+    "description": "Parser for ECMAScript 2018 regular expressions",
+    "devDependencies": {
+	"nodeunit": "*"
+    },
+    "scripts": {
+	"test": "node tests/runtests.js"
+    },
+    "license": "Apache 2.0"
+}
diff --git a/javascript/extractor/lib/esregex/regexparser.js b/javascript/extractor/lib/esregex/regexparser.js
new file mode 100644
index 00000000000..0afd4a19460
--- /dev/null
+++ b/javascript/extractor/lib/esregex/regexparser.js
@@ -0,0 +1,477 @@
+function RegExpParser(src) {
+    this.src = src;
+    this.pos = 0;
+    this.errors = [];
+    this.backrefs = [];
+    this.maxbackref = 0;
+}
+
+RegExpParser.prototype.parse = function() {
+    var res = this.Pattern();
+    this.backrefs.forEach(function(backref) {
+        if (backref.value > this.maxbackref)
+            this.error(RegExpParser.INVALID_BACKREF, backref.range[0], backref.range[1]);
+    }, this);
+    return res;
+};
+
+RegExpParser.prototype.setRange = function(start, node) {
+    node.range = [start, this.pos];
+    return node;
+};
+
+RegExpParser.UNEXPECTED_EOS = 0;
+RegExpParser.UNEXPECTED_CHARACTER = 1;
+RegExpParser.EXPECTED_DIGIT = 2;
+RegExpParser.EXPECTED_HEX_DIGIT = 3;
+RegExpParser.EXPECTED_CONTROL_LETTER = 4;
+RegExpParser.EXPECTED_CLOSING_PAREN = 5;
+RegExpParser.EXPECTED_CLOSING_BRACE = 6;
+RegExpParser.EXPECTED_EOS = 7;
+RegExpParser.OCTAL_ESCAPE = 8;
+RegExpParser.INVALID_BACKREF = 9;
+RegExpParser.EXPECTED_RBRACKET = 10;
+RegExpParser.EXPECTED_IDENTIFIER = 11;
+RegExpParser.EXPECTED_CLOSING_ANGLE = 12;
+
+RegExpParser.prototype.error = function(code, start, end) {
+    if (typeof start !== 'number')
+        start = this.pos;
+    if (typeof end !== 'number')
+        end = start+1;
+    this.errors.push({
+        type: 'Error',
+        code: code,
+        range: [start, end || start+1]
+    });
+};
+
+RegExpParser.prototype.atEOS = function() {
+    return this.pos >= this.src.length;
+};
+
+RegExpParser.prototype.nextChar = function() {
+    if (this.atEOS()) {
+        this.error(RegExpParser.UNEXPECTED_EOS);
+        return '\0';
+    } else {
+        return this.src.substring(this.pos, ++this.pos);
+    }
+};
+
+RegExpParser.prototype.readHexDigit = function() {
+    if (/[0-9a-fA-F]/.test(this.src[this.pos]))
+        return this.nextChar();
+    this.error(RegExpParser.EXPECTED_HEX_DIGIT, this.pos);
+    return '';
+};
+
+RegExpParser.prototype.readHexDigits = function(n) {
+    var res = '';
+    while (n-->0)
+        res += this.readHexDigit();
+    return res || '0';
+};
+
+RegExpParser.prototype.readDigits = function(opt) {
+    var res = "";
+    for (var c=this.src[this.pos]; /\d/.test(c); this.nextChar(), c=this.src[this.pos])
+        res += c;
+    if (!res.length && !opt)
+        this.error(RegExpParser.EXPECTED_DIGIT);
+    return res;
+};
+
+RegExpParser.prototype.readIdentifier = function() {
+    var res = '';
+    for (var c=this.src[this.pos]; c && /\w/.test(c); this.nextChar(), c=this.src[this.pos])
+        res += c;
+    if (!res.length)
+        this.error(RegExpParser.EXPECTED_IDENTIFIER);
+    return res;
+};
+
+RegExpParser.prototype.expectRParen = function() {
+    if (!this.match(")"))
+        this.error(RegExpParser.EXPECTED_CLOSING_PAREN, this.pos-1);
+};
+
+RegExpParser.prototype.expectRBrace = function() {
+    if (!this.match("}"))
+        this.error(RegExpParser.EXPECTED_CLOSING_BRACE, this.pos-1);
+};
+
+RegExpParser.prototype.expectRAngle = function() {
+    if (!this.match(">"))
+        this.error(RegExpParser.EXPECTED_CLOSING_ANGLE, this.pos-1);
+}
+
+RegExpParser.prototype.lookahead = function() {
+    for (var i=0,n=arguments.length; i<n; ++i) {
+        var prefix = arguments[i];
+        if (prefix === null) {
+            if (this.atEOS())
+                return true;
+        } else if (this.src.substring(this.pos, this.pos+prefix.length) === prefix) {
+            return true;
+        }
+    }
+    return false;
+};
+
+RegExpParser.prototype.match = function() {
+    for (var i=0,n=arguments.length; i<n; ++i) {
+        var prefix = arguments[i];
+        if (this.lookahead(prefix)) {
+            this.pos += (prefix||"").length;
+            return true;
+        }
+    }
+    return false;
+};
+
+RegExpParser.prototype.Pattern = function() {
+    var res = this.Disjunction();
+    if (!this.atEOS())
+        this.error(RegExpParser.EXPECTED_EOS);
+    return res;
+};
+
+RegExpParser.prototype.Disjunction = function() {
+    var start = this.pos,
+        disjuncts = [this.Alternative()];
+    while (this.match("|"))
+        disjuncts.push(this.Alternative());
+    if (disjuncts.length === 1)
+        return disjuncts[0];
+    return this.setRange(start, {
+        type: 'Disjunction',
+        disjuncts: disjuncts
+    });
+};
+
+RegExpParser.prototype.Alternative = function() {
+    var start = this.pos,
+        elements = [];
+    while (!this.lookahead(null, "|", ")"))
+        elements.push(this.Term());
+    if (elements.length === 1)
+        return elements[0];
+    return this.setRange(start, {
+        type: 'Sequence',
+        elements: elements
+    });
+};
+
+RegExpParser.prototype.Term = function() {
+    var start = this.pos,
+        dis;
+
+    if (this.match("^"))
+        return this.setRange(start, { type: 'Caret' });
+
+    if (this.match("$"))
+        return this.setRange(start, { type: 'Dollar' });
+
+    if (this.match("\\b"))
+        return this.setRange(start, { type: 'WordBoundary' });
+
+    if (this.match("\\B"))
+        return this.setRange(start, { type: 'NonWordBoundary' });
+
+    if (this.match("(?=")) {
+        dis = this.Disjunction();
+        this.expectRParen();
+        return this.setRange(start, {
+            type: 'ZeroWidthPositiveLookahead',
+            operand: dis
+        });
+    }
+
+    if (this.match("(?!")) {
+        dis = this.Disjunction();
+        this.expectRParen();
+        return this.setRange(start, {
+            type: 'ZeroWidthNegativeLookahead',
+            operand: dis
+        });
+    }
+
+    if (this.match("(?<=")) {
+        dis = this.Disjunction();
+        this.expectRParen();
+        return this.setRange(start, {
+            type: 'ZeroWidthPositiveLookbehind',
+            operand: dis
+        });
+    }
+
+    if (this.match("(?<!")) {
+        dis = this.Disjunction();
+        this.expectRParen();
+        return this.setRange(start, {
+            type: 'ZeroWidthNegativeLookbehind',
+            operand: dis
+        });
+    }
+
+    return this.setRange(start, this.QuantifierOpt(this.Atom()));
+};
+
+RegExpParser.prototype.QuantifierOpt = function(atom) {
+    var start = this.pos,
+        res = atom;
+    if (this.match("*"))
+        res = { type: 'Star', operand: atom };
+    else if (this.match("+"))
+        res = { type: 'Plus', operand: atom };
+    else if (this.match("?"))
+        res = { type: 'Opt', operand: atom };
+    else if (this.match("{")) {
+        var lo = +this.readDigits(),
+            hi = null;
+        if (this.match(",") && !this.lookahead("}"))
+            hi = +this.readDigits();
+        this.expectRBrace();
+        res = { type: 'Range', lo: lo, hi: hi, operand: atom };
+    }
+    if (this.match("?"))
+        res.greedy = false;
+    else if (res != atom)
+        res.greedy = true;
+    return this.setRange(start, res);
+};
+
+RegExpParser.prototype.Atom = function() {
+    var start = this.pos;
+
+    if (this.match("."))
+        return this.setRange(start, { type: 'Dot' });
+
+    if (this.match("\\"))
+        return this.setRange(start, this.AtomEscape());
+
+    if (this.lookahead("["))
+        return this.CharacterClass();
+
+    if (this.match("(")) {
+        var capture = !this.match("?:"), name = null;
+
+        if (this.match("?<")) {
+            name = this.readIdentifier();
+            this.expectRAngle();
+        }
+
+        if (capture)
+            ++this.maxbackref;
+        var number = this.maxbackref;
+        var dis = this.Disjunction();
+        this.expectRParen();
+        return this.setRange(start, {
+            type: 'Group',
+            capture: capture,
+            number: number,
+            name: name,
+            operand: dis
+        });
+    }
+
+    var c = this.nextChar();
+    if ("^$\\.*+?()[]{}|".indexOf(c) !== -1)
+        this.error(RegExpParser.UNEXPECTED_CHARACTER, this.pos-1);
+    return this.setRange(start, { type: 'Constant', value: c });
+};
+
+RegExpParser.prototype.AtomEscape = function(inCharClass) {
+    var raw, value, codepoint;
+
+    if (this.match("x")) {
+        raw = this.readHexDigits(2);
+        codepoint = parseInt(raw, 16);
+        value = String.fromCharCode(codepoint);
+        return {
+            type: 'HexEscapeSequence',
+            value: value,
+            codepoint: codepoint,
+            raw: '\\x' + raw
+        };
+    }
+
+    if (this.match("u")) {
+        if (this.match("{")) {
+            var closePos = this.src.indexOf("}", this.pos);
+            var n;
+            if (closePos == -1) {
+                // don't attempt to read any digits, but
+                // report missing `}`
+                n = 0;
+            } else if (closePos == this.pos) {
+                // empty escape sequence, trigger an error
+                n = 1;
+            } else {
+                n = closePos - this.pos;
+            }
+            raw = this.readHexDigits(n);
+            this.expectRBrace();
+            codepoint = parseInt(raw, 16);
+            raw = "{" + raw + "}"
+        } else {
+            raw = this.readHexDigits(4);
+            codepoint = parseInt(raw, 16);
+        }
+        value = String.fromCharCode(codepoint);
+        return {
+            type: 'UnicodeEscapeSequence',
+            value: value,
+            codepoint: codepoint,
+            raw: '\\u' + raw
+        };
+    }
+
+    if (this.match("k<")) {
+        var name = this.readIdentifier();
+        this.expectRAngle();
+        return {
+            type: 'NamedBackReference',
+            name: name,
+            raw: "\\k<" + name + ">"
+        };
+    }
+
+    if (this.match("p{", "P{")) {
+        var name = this.readIdentifier(), value = null;
+        if (this.match("="))
+            value = this.readIdentifier();
+        this.expectRBrace();
+        return {
+            type: 'UnicodePropertyEscape',
+            name: name,
+            value: value,
+            raw: '\\p{' + name + (value ? '=' + value : '') + '}'
+        };
+    }
+
+    var startpos = this.pos-1,
+        c = this.nextChar();
+
+    if (/[0-9]/.test(c)) {
+        raw = c + this.readDigits(true);
+        if (c === '0' || inCharClass) {
+            var base = c === '0' && raw.length > 1 ? 8 : 10;
+            codepoint = parseInt(raw, base);
+            value = String.fromCharCode(codepoint);
+            var type;
+            if (base === 8) {
+                type = 'OctalEscape';
+                this.error(RegExpParser.OCTAL_ESCAPE, startpos, this.pos);
+            } else {
+                type = 'DecimalEscape';
+            }
+
+            return {
+                type: type,
+                value: value,
+                codepoint: codepoint,
+                raw: '\\' + raw
+            };
+        } else {
+            var br = {
+                type: 'BackReference',
+                value: parseInt(raw, 10),
+                raw: '\\' + raw
+            };
+            this.backrefs.push(br);
+            return br;
+        }
+    }
+
+    var ctrltab = "f\fn\nr\rt\tv\v", idx;
+    if ((idx=ctrltab.indexOf(c)) % 2 == 0) {
+        value = ctrltab.charAt(idx+1);
+        return {
+            type: 'ControlEscape',
+            value: value,
+            codepoint: value.charCodeAt(0),
+            raw: '\\' + c
+        };
+    }
+
+    if (c === 'c') {
+        c = this.nextChar();
+        if (!/[a-zA-Z]/.test(c))
+            this.error(RegExpParser.EXPECTED_CONTROL_LETTER, this.pos-1);
+        codepoint = c.charCodeAt(0) % 32;
+        return {
+            type: 'ControlLetter',
+            value: String.fromCharCode(codepoint),
+            codepoint: codepoint,
+            raw: '\\c' + c
+        };
+    }
+
+    if (/[dsw]/i.test(c)) {
+        return {
+            type: 'CharacterClassEscape',
+            class: c,
+            raw: '\\' + c
+        };
+    }
+
+    return {
+        type: 'IdentityEscape',
+        value: c,
+        codepoint: c.charCodeAt(0),
+        raw: '\\' + c
+    };
+};
+
+RegExpParser.prototype.CharacterClass = function() {
+    var start = this.pos,
+        elements = [];
+
+    this.match("[");
+    var inverted = this.match("^");
+    while (!this.match("]")) {
+        if (this.atEOS()) {
+            this.error(RegExpParser.EXPECTED_RBRACKET);
+            break;
+        }
+        elements.push(this.CharacterClassElement());
+    }
+    return this.setRange(start, {
+        type: 'CharacterClass',
+        elements: elements,
+        inverted: inverted
+    });
+};
+
+RegExpParser.prototype.CharacterClassElement = function() {
+    var start = this.pos,
+        atom = this.CharacterClassAtom();
+    if (!this.lookahead("-]") && this.match("-"))
+        return this.setRange(start, {
+            type: 'CharacterClassRange',
+            left: atom,
+            right: this.CharacterClassAtom()
+        });
+    return atom;
+};
+
+RegExpParser.prototype.CharacterClassAtom = function() {
+    var start = this.pos,
+        c = this.nextChar();
+    if (c === "\\") {
+        if (this.match("b"))
+          return this.setRange(start, {
+              type: 'ControlEscape',
+              value: '\b',
+              codepoint: 8,
+              raw: '\\b'
+          });
+        return this.setRange(start, this.AtomEscape(true));
+    }
+    return this.setRange(start, { type: 'Constant', value: c });
+};
+
+if (typeof exports !== 'undefined')
+    exports.RegExpParser = RegExpParser;
diff --git a/javascript/extractor/lib/esregex/tests/runtests.js b/javascript/extractor/lib/esregex/tests/runtests.js
new file mode 100644
index 00000000000..bbe6945302d
--- /dev/null
+++ b/javascript/extractor/lib/esregex/tests/runtests.js
@@ -0,0 +1,638 @@
+var reporter = require('nodeunit').reporters['default'],
+    RegExpParser = require('../regexparser').RegExpParser;
+
+function runtest(test, input, expected_output, expected_errors) {
+    var parser = new RegExpParser(input),
+        actual_output;
+
+    try {
+        actual_output = parser.parse();
+    } catch(e) {
+        test.fail(e.message);
+        test.done();
+        return;
+    }
+
+    expected_errors = expected_errors || [];
+
+    test.deepEqual(actual_output, expected_output);
+    test.equal(parser.errors.length, expected_errors.length);
+    for (var i=0,n=parser.errors.length; i<n; ++i)
+        test.deepEqual(parser.errors[i], expected_errors[i]);
+    test.done();
+}
+
+var tests = {
+    trivial: function(test) {
+        runtest(test,
+                "t",
+                { type: "Constant", value: "t", range: [0, 1] });
+    },
+    simple: function(test) {
+        runtest(test,
+                "foo",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: "Constant", value: "o", range: [2, 3] } ],
+                    range: [0, 3] });
+    },
+    alternatives: function(test) {
+        runtest(test,
+                "foo|bar",
+                { type: 'Disjunction',
+                  disjuncts:
+                   [ { type: 'Sequence',
+                       elements:
+                        [ { type: 'Constant', value: 'f', range: [ 0, 1 ] },
+                          { type: 'Constant', value: 'o', range: [ 1, 2 ] },
+                          { type: 'Constant', value: 'o', range: [ 2, 3 ] } ],
+                       range: [0, 3] },
+                     { type: 'Sequence',
+                       elements:
+                        [ { type: 'Constant', value: 'b', range: [ 4, 5 ] },
+                          { type: 'Constant', value: 'a', range: [ 5, 6 ] },
+                          { type: 'Constant', value: 'r', range: [ 6, 7 ] } ],
+                       range: [4, 7] } ],
+                    range: [0, 7] });
+    },
+    opt: function(test) {
+        runtest(test,
+                "foo?",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: 'Opt',
+                      operand: { type: "Constant", value: "o", range: [2, 3] },
+                      greedy: true,
+                      range: [2, 4] } ],
+                  range: [0, 4] });
+    },
+    plus: function(test) {
+        runtest(test,
+                "foo+",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: 'Plus',
+                      operand: { type: "Constant", value: "o", range: [2, 3] },
+                      greedy: true,
+                      range: [2, 4] } ],
+                  range: [0, 4] });
+    },
+    range: function(test) {
+        runtest(test,
+                "foo{1,2}",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: 'Range', lo: 1, hi: 2,
+                      operand: { type: "Constant", value: "o", range: [2, 3] },
+                      greedy: true,
+                      range: [2, 8] } ],
+                  range: [0, 8] });
+    },
+    lrange: function(test) {
+        runtest(test,
+                "foo{1,}",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: 'Range', lo: 1, hi: null,
+                      operand: { type: "Constant", value: "o", range: [2, 3] },
+                      greedy: true,
+                      range: [2, 7] } ],
+                  range: [0, 7] });
+    },
+    trange: function(test) {
+        runtest(test,
+                "foo{1}",
+                { type: "Sequence",
+                  elements:
+                  [ { type: "Constant", value: "f", range: [0, 1] },
+                    { type: "Constant", value: "o", range: [1, 2] },
+                    { type: 'Range', lo: 1, hi: null,
+                      operand: { type: "Constant", value: "o", range: [2, 3] },
+                      greedy: true,
+                      range: [2, 6] } ],
+                  range: [0, 6] });
+    },
+    lowercase: function(test) {
+        runtest(test,
+                "[a-z]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'CharacterClassRange',
+                      left: { type: 'Constant', value: 'a', range: [1, 2] },
+                      right: { type: 'Constant', value: 'z', range: [3, 4] },
+                      range: [1, 4] } ],
+                  inverted: false,
+                  range: [0, 5] });
+    },
+    alpha: function(test) {
+        runtest(test,
+                "[a-zA-Z]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'CharacterClassRange',
+                      left: { type: 'Constant', value: 'a', range: [1, 2] },
+                      right: { type: 'Constant', value: 'z', range: [3, 4] },
+                      range: [1, 4] },
+                    { type: 'CharacterClassRange',
+                      left: { type: 'Constant', value: 'A', range: [4, 5] },
+                      right: { type: 'Constant', value: 'Z', range: [6, 7] },
+                      range: [4, 7] }],
+                  inverted: false,
+                  range: [0, 8] });
+    },
+    idpart: function(test) {
+        runtest(test,
+                "[a-zA-Z_]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'CharacterClassRange',
+                      left: { type: 'Constant', value: 'a', range: [1, 2] },
+                      right: { type: 'Constant', value: 'z', range: [3, 4] },
+                      range: [1, 4] },
+                    { type: 'CharacterClassRange',
+                      left: { type: 'Constant', value: 'A', range: [4, 5] },
+                      right: { type: 'Constant', value: 'Z', range: [6, 7] },
+                      range: [4, 7] },
+                    { type: 'Constant', value: '_', range: [7, 8] } ],
+                  inverted: false,
+                  range: [0, 9] });
+    },
+    empty_cclass: function(test) {
+        runtest(test,
+                "[]",
+                { type: 'CharacterClass', elements: [], inverted: false, range: [0, 2] });
+    },
+    universal_cclass: function(test) {
+        runtest(test,
+                "[^]",
+                { type: 'CharacterClass', elements: [], inverted: true, range: [0, 3] });
+    },
+    dash_cclass: function(test) {
+        runtest(test,
+                "[-]",
+                { type: 'CharacterClass',
+                  elements: [
+                      { type: 'Constant', value: '-', range: [1, 2] }
+                  ],
+                  inverted: false,
+                  range: [0, 3] });
+    },
+    ctrlescape: function(test) {
+        runtest(test,
+                "\\t",
+                { type: 'ControlEscape',
+                  value: '\t',
+                  codepoint: 9,
+                  raw: '\\t',
+                  range: [0, 2] });
+    },
+    decescape: function(test) {
+        runtest(test,
+                "\\0",
+                { type: 'DecimalEscape',
+                  value: '\0',
+                  codepoint: 0,
+                  raw: '\\0',
+                  range: [0, 2] });
+    },
+    octescape: function(test) {
+        runtest(test,
+                "\\012",
+                { type: 'OctalEscape',
+                  value: '\012',
+                  codepoint: 10,
+                  raw: '\\012',
+                  range: [0, 4] },
+                [ { type : 'Error',
+                    code: 8,
+                   range: [0,4] } ]);
+    },
+    hexescape: function(test) {
+        runtest(test,
+                "\\x0a",
+                { type: 'HexEscapeSequence',
+                  value: '\n',
+                  codepoint: 10,
+                  raw: '\\x0a',
+                  range: [0, 4] });
+    },
+    HEXescape: function(test) {
+        runtest(test,
+                "\\x0A",
+                { type: 'HexEscapeSequence',
+                  value: '\n',
+                  codepoint: 10,
+                  raw: '\\x0A',
+                  range: [0, 4] });
+    },
+    anchors: function(test) {
+        runtest(test,
+                "^\\s+$",
+                { type: 'Sequence',
+                  elements:
+                  [ { type: 'Caret', range: [0, 1] },
+                    { type: 'Plus',
+                      operand:
+                      { type: 'CharacterClassEscape',
+                        class: 's',
+                        raw: '\\s',
+                        range: [1, 3] },
+                      greedy: true,
+                      range: [1, 4] },
+                     { type: 'Dollar', range: [4, 5] } ],
+                  range: [0, 5] });
+    },
+    charclass_with_trailing_dash: function(test) {
+        runtest(test,
+                "[w-]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'Constant', value: 'w', range: [1, 2] },
+                    { type: 'Constant', value: '-', range: [2, 3] } ],
+                  inverted: false,
+                  range: [0, 4] });
+    },
+    confusing_char_class: function(test) {
+        runtest(test,
+                "[[{]\w+[]}]",
+                { type: 'Sequence',
+                  elements:
+                  [ { type: 'CharacterClass',
+                      elements:
+                      [ { type: 'Constant', value: '[', range: [1, 2] },
+                        { type: 'Constant', value: '{', range: [2, 3] } ],
+                      inverted: false,
+                      range: [0, 4] },
+                    { type: 'Plus',
+                      operand: { type: 'Constant', value: 'w', range: [4, 5] },
+                      greedy: true,
+                      range: [4, 6] },
+                    { type: 'CharacterClass',
+                      elements: [],
+                      inverted: false,
+                      range: [ 6, 8 ] },
+                    { type: 'Constant', value: '}', range: [8, 9] },
+                    { type: 'Constant', value: ']', range: [9, 10] } ],
+                  range: [0, 10] },
+                [ { type: 'Error',
+                    code: 1,
+                    range: [8, 9] },
+                  { type: 'Error',
+                    code: 1,
+                    range: [9, 10] } ]);
+    },
+    backspace: function(test) {
+        runtest(test,
+                "[\\b]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'ControlEscape',
+                      value: '\b',
+                      codepoint: 8,
+                      raw: '\\b',
+                      range: [1, 3] } ],
+                  inverted: false,
+                  range: [0, 4] });
+    },
+    wordboundary: function(test) {
+        runtest(test,
+                "\\b",
+                { type: 'WordBoundary', range: [0, 2] });
+    },
+    backref: function(test) {
+        runtest(test,
+                "(abc)\\1",
+                { type: 'Sequence',
+                  elements:
+                  [ { type: 'Group',
+                      capture: true,
+                      number: 1,
+                      name: null,
+                      operand:
+                      { type: 'Sequence',
+                        elements:
+                        [ { type: 'Constant', value: 'a', range: [1, 2] },
+                          { type: 'Constant', value: 'b', range: [2, 3] },
+                          { type: 'Constant', value: 'c', range: [3, 4] } ],
+                          range: [1, 4] },
+                      range: [0, 5] },
+                    { type: 'BackReference', value: 1, raw: '\\1', range: [5, 7] } ],
+                  range: [0, 7] });
+    },
+    invalid_backref: function(test) {
+        runtest(test,
+                "\\1",
+                { type: 'BackReference', value: 1, raw: '\\1', range: [0, 2] },
+                [ { type: 'Error', code: 9, range: [0, 2] } ]);
+    },
+    nested_groups: function(test) {
+        runtest(test,
+                "((a))",
+                { type: 'Group',
+                  capture: true,
+                  number: 1,
+                  name: null,
+                  operand:
+                  { type: 'Group',
+                    capture: true,
+                    number: 2,
+                    name: null,
+                    operand: { type: 'Constant', value: 'a', range: [ 2, 3 ] },
+                    range: [ 1, 4 ] },
+                  range: [ 0, 5 ] });
+    },
+    invalid_hex_escape_in_charclass: function(test) {
+        runtest(test,
+                "[\\x]+",
+                { type: 'Plus',
+                  operand:
+                  { type: 'CharacterClass',
+                    elements:
+                    [ { type: 'HexEscapeSequence',
+                        value: '\u0000',
+                        codepoint: 0,
+                        raw: '\\x0',
+                        range: [ 1, 3 ] } ],
+                    inverted: false,
+                    range: [ 0, 4 ] },
+                  greedy: true,
+                  range: [ 0, 5 ] },
+               [ { type: 'Error', code: 3, range: [3,4] },
+                 { type: 'Error', code: 3, range: [3,4] } ]);
+    },
+    unterminated_charclass: function(test) {
+        runtest(test,
+                "[ab",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'Constant', value: 'a', range: [ 1, 2 ] },
+                    { type: 'Constant', value: 'b', range: [ 2, 3 ] } ],
+                  inverted: false,
+                  range: [ 0, 3 ] },
+                [ { type: 'Error', code: 10, range: [3, 4] } ]);
+    },
+    decescape_in_charclass: function(test) {
+        runtest(test,
+                "[\\1]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'DecimalEscape',
+                      value: '\1',
+                      codepoint: 1,
+                      raw: '\\1',
+                      range: [1, 3] } ],
+                  inverted: false,
+                  range: [ 0, 4 ] });
+    },
+    octescape_in_charclass: function(test) {
+        runtest(test,
+                "[\\012]",
+                { type: 'CharacterClass',
+                  elements:
+                  [ { type: 'OctalEscape',
+                      value: '\012',
+                      codepoint: 10,
+                      raw: '\\012',
+                      range: [1, 5] } ],
+                  inverted: false,
+                  range: [ 0, 6 ] },
+                [ { type : 'Error',
+                    code: 8,
+                   range: [1,5] } ]);
+    },
+    long_hexescape: function(test) {
+    runtest(test,
+        "\\u{00000a}b",
+        { type: 'Sequence',
+          elements:
+          [ { type: 'UnicodeEscapeSequence',
+              value: '\n',
+              codepoint: 10,
+              raw: '\\u{00000a}',
+              range: [0, 10] },
+            { type: 'Constant', value: 'b', range: [ 10, 11 ] } ],
+          range: [ 0, 11 ] });
+    },
+    long_hexescape_incomplete: function(test) {
+    runtest(test,
+        "\\u{abc",
+        { type: 'Sequence',
+          elements:
+          [ { type: 'UnicodeEscapeSequence',
+              value: '\u0000',
+              codepoint: 0,
+              raw: '\\u{0}',
+              range: [ 0, 3 ] },
+            { type: 'Constant', value: 'a', range: [ 3, 4 ] },
+            { type: 'Constant', value: 'b', range: [ 4, 5 ] },
+            { type: 'Constant', value: 'c', range: [ 5, 6 ] } ],
+          range: [ 0, 6 ] },
+        [ { type: 'Error', code: 6, range: [2, 3] } ]);
+    },
+    long_hexescape_empty: function(test) {
+    runtest(test,
+        "\\u{}",
+        { type: 'UnicodeEscapeSequence',
+          value: '\u0000',
+          codepoint: 0,
+          raw: '\\u{0}',
+          range: [ 0, 4 ] },
+        [ { type: 'Error', code: 3, range: [3, 4] } ]);
+    },
+    long_hexescape_invalid: function(test) {
+    runtest(test,
+        "\\u{1,}",
+        { type: 'Sequence',
+          elements:
+          [ { type: 'UnicodeEscapeSequence',
+              value: '\u0001',
+              codepoint: 1,
+              raw: '\\u{1}',
+              range: [ 0, 4 ] },
+            { type: 'Constant', value: ',', range: [ 4, 5 ] },
+            { type: 'Constant', value: '}', range: [ 5, 6 ] } ],
+          range: [ 0, 6 ] },
+        [ { type: 'Error', code: 3, range: [4, 5] },
+          { type: 'Error', code: 6, range: [3, 4] },
+          { type: 'Error', code: 1, range: [5, 6] } ]);
+    },
+    named_capture_group: function(test) {
+    runtest(test,
+        "(?<ws>\\w+)",
+        { type: 'Group',
+          capture: true,
+          number: 1,
+          name: 'ws',
+          operand:
+          { type: 'Plus',
+            operand:
+            { type: 'CharacterClassEscape',
+              class: 'w',
+              raw: '\\w',
+              range: [ 6, 8 ] },
+          greedy: true,
+          range: [ 6, 9 ] },
+        range: [ 0, 10 ] },
+        []);
+    },
+    named_capture_group_empty_name: function(test) {
+    runtest(test,
+        "(?<>\\w+)",
+        { type: 'Group',
+          capture: true,
+          number: 1,
+          name: '',
+          operand:
+          { type: 'Plus',
+            operand:
+            { type: 'CharacterClassEscape',
+              class: 'w',
+              raw: '\\w',
+              range: [ 4, 6 ] },
+          greedy: true,
+          range: [ 4, 7 ] },
+        range: [ 0, 8 ] },
+        [ { type: 'Error', code: 11, range: [ 3, 4 ] } ]);
+    },
+    named_capture_group_missing_rangle: function(test) {
+    runtest(test,
+        "(?<ws\\w+)",
+        { type: 'Group',
+          capture: true,
+          number: 1,
+          name: 'ws',
+          operand:
+          { type: 'Plus',
+            operand:
+            { type: 'CharacterClassEscape',
+              class: 'w',
+              raw: '\\w',
+              range: [ 5, 7 ] },
+          greedy: true,
+          range: [ 5, 8 ] },
+        range: [ 0, 9 ] },
+        [ { type: 'Error', code: 12, range: [ 4, 5 ] } ]);
+    },
+    named_capture_group_missing_rparen: function(test) {
+    runtest(test,
+        "(?<ws>\\w+",
+        { type: 'Group',
+          capture: true,
+          number: 1,
+          name: 'ws',
+          operand:
+          { type: 'Plus',
+            operand:
+            { type: 'CharacterClassEscape',
+              class: 'w',
+              raw: '\\w',
+              range: [ 6, 8 ] },
+          greedy: true,
+          range: [ 6, 9 ] },
+        range: [ 0, 9 ] },
+        [ { type: 'Error', code: 5, range: [ 8, 9 ] } ]);
+    },
+    named_backref: function(test) {
+    runtest(test,
+        "\\k<ws>",
+        { type: 'NamedBackReference',
+          name: 'ws',
+          raw: '\\k<ws>',
+          range: [ 0, 6 ] },
+        []);
+    },
+    named_backref_empty_name: function(test) {
+    runtest(test,
+        "\\k<>",
+        { type: 'NamedBackReference',
+          name: '',
+          raw: '\\k<>',
+          range: [ 0, 4 ] },
+        [ { type: 'Error', code: 11, range: [ 3, 4 ] } ]);
+    },
+    named_backref_missing_rangle: function(test) {
+    runtest(test,
+        "\\k<ws",
+        { type: 'NamedBackReference',
+          name: 'ws',
+          raw: '\\k<ws>',
+          range: [ 0, 5 ] },
+        [ { type: 'Error', code: 12, range: [ 4, 5 ] } ]);
+    },
+    positive_lookbehind: function(test) {
+    runtest(test,
+        "(?<=\$)0",
+        { type: 'Sequence',
+          elements:
+          [ { type: 'ZeroWidthPositiveLookbehind',
+              operand: { type: 'Dollar', range: [ 4, 5 ] },
+              range: [ 0, 6 ] },
+            { type: 'Constant', value: '0', range: [ 6, 7 ] } ],
+              range: [ 0, 7 ] },
+        []);
+    },
+    negative_lookbehind: function(test) {
+    runtest(test,
+        "(?<!\$)0",
+        { type: 'Sequence',
+          elements:
+          [ { type: 'ZeroWidthNegativeLookbehind',
+              operand: { type: 'Dollar', range: [ 4, 5 ] },
+              range: [ 0, 6 ] },
+            { type: 'Constant', value: '0', range: [ 6, 7 ] } ],
+              range: [ 0, 7 ] },
+        []);
+    },
+    unicode_property_escape: function(test) {
+    runtest(test,
+        "\\p{Number}",
+        { type: 'UnicodePropertyEscape',
+          name: 'Number',
+          value: null,
+          raw: '\\p{Number}',
+          range: [ 0, 10 ] },
+        []);
+    },
+    unicode_property_escape_uc: function(test) {
+    runtest(test,
+        "\\P{Number}",
+        { type: 'UnicodePropertyEscape',
+          name: 'Number',
+          value: null,
+          raw: '\\p{Number}',
+          range: [ 0, 10 ] },
+        []);
+    },
+    unicode_property_escape_binary: function(test) {
+    runtest(test,
+        "\\p{Script=Greek}",
+        { type: 'UnicodePropertyEscape',
+          name: 'Script',
+          value: 'Greek',
+          raw: '\\p{Script=Greek}',
+          range: [ 0, 16 ] },
+        []);
+    },
+    unicode_property_escape_missing_rbrace: function(test) {
+    runtest(test,
+        "\\p{Number",
+        { type: 'UnicodePropertyEscape',
+          name: 'Number',
+          value: null,
+          raw: '\\p{Number}',
+          range: [ 0, 9 ] },
+        [ { type: 'Error', code: 6, range: [ 8, 9 ] } ]);
+    }
+};
+
+reporter.run({ "unit tests": tests });
diff --git a/javascript/extractor/lib/external/doctrine/.gitignore b/javascript/extractor/lib/external/doctrine/.gitignore
new file mode 100644
index 00000000000..ba73eea1540
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+
+*.iml
\ No newline at end of file
diff --git a/javascript/extractor/lib/external/doctrine/.scripted b/javascript/extractor/lib/external/doctrine/.scripted
new file mode 100644
index 00000000000..89683cd30f2
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/.scripted
@@ -0,0 +1,6 @@
+{
+        "editor": {
+            "expandtab": true,
+			"tabsize": 4
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/lib/external/doctrine/.travis.yml b/javascript/extractor/lib/external/doctrine/.travis.yml
new file mode 100644
index 00000000000..155fbfa9bf1
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/.travis.yml
@@ -0,0 +1,4 @@
+language: node_js
+node_js:
+  - 0.10
+
diff --git a/javascript/extractor/lib/external/doctrine/CONTRIBUTING.md b/javascript/extractor/lib/external/doctrine/CONTRIBUTING.md
new file mode 100644
index 00000000000..6e0978475e0
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/CONTRIBUTING.md
@@ -0,0 +1,5 @@
+Project license(s): 2-clause BSD license
+
+* You will only Submit Contributions where You have authored 100% of the content.
+* You will only Submit Contributions to which You have the necessary rights. This means that if You are employed You have received the necessary permissions from Your employer to make the Contributions.
+* Whatever content You Contribute will be provided under the Project License(s).
diff --git a/javascript/extractor/lib/external/doctrine/LICENSE.BSD b/javascript/extractor/lib/external/doctrine/LICENSE.BSD
new file mode 100644
index 00000000000..3e580c355a9
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/LICENSE.BSD
@@ -0,0 +1,19 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/javascript/extractor/lib/external/doctrine/LICENSE.closure-compiler b/javascript/extractor/lib/external/doctrine/LICENSE.closure-compiler
new file mode 100644
index 00000000000..d6456956733
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/LICENSE.closure-compiler
@@ -0,0 +1,202 @@
+
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diff --git a/javascript/extractor/lib/external/doctrine/LICENSE.esprima b/javascript/extractor/lib/external/doctrine/LICENSE.esprima
new file mode 100644
index 00000000000..3e580c355a9
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/LICENSE.esprima
@@ -0,0 +1,19 @@
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/javascript/extractor/lib/external/doctrine/README.md b/javascript/extractor/lib/external/doctrine/README.md
new file mode 100644
index 00000000000..5be6fa93299
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/README.md
@@ -0,0 +1,173 @@
+doctrine ([doctrine](http://github.com/Constellation/doctrine)) is JSDoc parser. [![Build Status](https://secure.travis-ci.org/Constellation/doctrine.png)](http://travis-ci.org/Constellation/doctrine)
+
+It is now used by content assist system of [Eclipse Orion](http://www.eclipse.org/orion/) ([detail](http://planetorion.org/news/2012/10/orion-1-0-release/))
+
+Doctrine can be used in a web browser:
+
+    <script src="doctrine.js"></script>
+
+or in a Node.js application via the package manager:
+
+    npm install doctrine
+
+simple example:
+
+    doctrine.parse(
+        [
+            "/**",
+            " * This function comment is parsed by doctrine",
+            " * @param {{ok:String}} userName",
+            "*/"
+        ].join('\n'), { unwrap: true });
+
+and gets following information
+
+    {
+        "description": "This function comment is parsed by doctrine",
+        "tags": [
+            {
+                "title": "param",
+                "description": null,
+                "type": {
+                    "type": "RecordType",
+                    "fields": [
+                        {
+                            "type": "FieldType",
+                            "key": "ok",
+                            "value": {
+                                "type": "NameExpression",
+                                "name": "String"
+                            }
+                        }
+                    ]
+                },
+                "name": "userName"
+            }
+        ]
+    }
+
+see [demo page](http://constellation.github.com/doctrine/demo/index.html) more detail.
+
+### Options
+
+#### doctrine.parse
+We can pass options to `doctrine.parse(comment, options)`.
+```js
+{
+    unwrap: boolean,          // default: false
+    tags: [ string ] | null,  // default: null
+    recoverable: boolean,     // default: false
+    sloppy: boolean,          // default: false
+    lineNumbers: boolean      // default: false
+}
+```
+
+##### unwrap
+
+When `unwrap` is `true`, doctrine attempt to unwrap comment specific string from a provided comment text. (removes `/**`, `*/` and `*`)
+For example, `unwrap` transforms
+```
+/**
+ * @param use
+ */
+```
+to
+```
+@param use
+```
+If a provided comment has these comment specific strings, you need to specify this `unwrap` option to `true`.
+
+##### tags
+
+When `tags` array is specified, doctrine only produce tags that is specified in this array.
+For example, if you specify `[ 'param' ]`, doctrine only produces `param` tags.
+If null is specified, doctrine produces all tags that doctrine can recognize.
+
+##### recoverable
+
+When `recoverable` is `true`, doctrine becomes `recoverable` - When failing to parse jsdoc comment, doctrine recovers its state and attempt to continue parsing.
+
+##### sloppy
+
+When `sloppy` is `true`,
+```
+@param String [foo]
+```
+'s `[foo]` is interpreted as a optional parameter, not interpreted as a name of this `@param`.
+
+##### lineNumbers
+
+When `lineNumbers` is `true`, parsed tags will include a `lineNumber` property indicating the line (relative to the start of the comment block) where each tag is located in the source. So, given the following comment:
+```
+/**
+ * @param {String} foo
+ * @return {number}
+ */
+```
+The `@param` tag will have `lineNumber: 1`, and the `@return` tag will have `lineNumber: 2`.
+
+
+### License
+
+#### doctrine
+
+Copyright (C) 2012 [Yusuke Suzuki](http://github.com/Constellation)
+ (twitter: [@Constellation](http://twitter.com/Constellation)) and other contributors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#### esprima
+
+some of functions is derived from esprima
+
+Copyright (C) 2012, 2011 [Ariya Hidayat](http://ariya.ofilabs.com/about)
+ (twitter: [@ariyahidayat](http://twitter.com/ariyahidayat)) and other contributors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in the
+    documentation and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+#### closure-compiler
+
+some of extensions is derived from closure-compiler
+
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
diff --git a/javascript/extractor/lib/external/doctrine/doctrine.js b/javascript/extractor/lib/external/doctrine/doctrine.js
new file mode 100644
index 00000000000..1c1dd1e62f2
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/doctrine.js
@@ -0,0 +1,2146 @@
+/*
+  Copyright (C) 2012-2014 Yusuke Suzuki <utatane.tea@gmail.com>
+  Copyright (C) 2014 Dan Tao <daniel.tao@gmail.com>
+  Copyright (C) 2013 Andrew Eisenberg <andrew@eisenberg.as>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*jslint bitwise:true plusplus:true eqeq:true nomen:true*/
+/*global doctrine:true, exports:true, parseTypeExpression:true, parseTop:true*/
+
+(function (exports) {
+    'use strict';
+
+    var VERSION,
+        Regex,
+        CanAccessStringByIndex,
+        typed,
+        jsdoc,
+        isArray,
+        hasOwnProperty;
+
+    // Sync with package.json.
+    VERSION = '0.5.2-dev';
+
+    // See also tools/generate-unicode-regex.py.
+    Regex = {
+        NonAsciiIdentifierStart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]'),
+        NonAsciiIdentifierPart: new RegExp('[\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0300-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u0483-\u0487\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u05d0-\u05ea\u05f0-\u05f2\u0610-\u061a\u0620-\u0669\u066e-\u06d3\u06d5-\u06dc\u06df-\u06e8\u06ea-\u06fc\u06ff\u0710-\u074a\u074d-\u07b1\u07c0-\u07f5\u07fa\u0800-\u082d\u0840-\u085b\u08a0\u08a2-\u08ac\u08e4-\u08fe\u0900-\u0963\u0966-\u096f\u0971-\u0977\u0979-\u097f\u0981-\u0983\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bc-\u09c4\u09c7\u09c8\u09cb-\u09ce\u09d7\u09dc\u09dd\u09df-\u09e3\u09e6-\u09f1\u0a01-\u0a03\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a59-\u0a5c\u0a5e\u0a66-\u0a75\u0a81-\u0a83\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abc-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ad0\u0ae0-\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3c-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5c\u0b5d\u0b5f-\u0b63\u0b66-\u0b6f\u0b71\u0b82\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd0\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d-\u0c44\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c58\u0c59\u0c60-\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbc-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0cde\u0ce0-\u0ce3\u0ce6-\u0cef\u0cf1\u0cf2\u0d02\u0d03\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d-\u0d44\u0d46-\u0d48\u0d4a-\u0d4e\u0d57\u0d60-\u0d63\u0d66-\u0d6f\u0d7a-\u0d7f\u0d82\u0d83\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e01-\u0e3a\u0e40-\u0e4e\u0e50-\u0e59\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb9\u0ebb-\u0ebd\u0ec0-\u0ec4\u0ec6\u0ec8-\u0ecd\u0ed0-\u0ed9\u0edc-\u0edf\u0f00\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f3e-\u0f47\u0f49-\u0f6c\u0f71-\u0f84\u0f86-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u1049\u1050-\u109d\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u135d-\u135f\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1714\u1720-\u1734\u1740-\u1753\u1760-\u176c\u176e-\u1770\u1772\u1773\u1780-\u17d3\u17d7\u17dc\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u1820-\u1877\u1880-\u18aa\u18b0-\u18f5\u1900-\u191c\u1920-\u192b\u1930-\u193b\u1946-\u196d\u1970-\u1974\u1980-\u19ab\u19b0-\u19c9\u19d0-\u19d9\u1a00-\u1a1b\u1a20-\u1a5e\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1aa7\u1b00-\u1b4b\u1b50-\u1b59\u1b6b-\u1b73\u1b80-\u1bf3\u1c00-\u1c37\u1c40-\u1c49\u1c4d-\u1c7d\u1cd0-\u1cd2\u1cd4-\u1cf6\u1d00-\u1de6\u1dfc-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u200c\u200d\u203f\u2040\u2054\u2071\u207f\u2090-\u209c\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d7f-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2de0-\u2dff\u2e2f\u3005-\u3007\u3021-\u302f\u3031-\u3035\u3038-\u303c\u3041-\u3096\u3099\u309a\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua62b\ua640-\ua66f\ua674-\ua67d\ua67f-\ua697\ua69f-\ua6f1\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua827\ua840-\ua873\ua880-\ua8c4\ua8d0-\ua8d9\ua8e0-\ua8f7\ua8fb\ua900-\ua92d\ua930-\ua953\ua960-\ua97c\ua980-\ua9c0\ua9cf-\ua9d9\uaa00-\uaa36\uaa40-\uaa4d\uaa50-\uaa59\uaa60-\uaa76\uaa7a\uaa7b\uaa80-\uaac2\uaadb-\uaadd\uaae0-\uaaef\uaaf2-\uaaf6\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabea\uabec\uabed\uabf0-\uabf9\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\ufe70-\ufe74\ufe76-\ufefc\uff10-\uff19\uff21-\uff3a\uff3f\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc]')
+    };
+
+    CanAccessStringByIndex = typeof 'doctrine'[0] !== undefined;
+
+    function sliceSource(source, index, last) {
+        var output;
+        if (!CanAccessStringByIndex) {
+            output = source.slice(index, last).join('');
+        } else {
+            output = source.slice(index, last);
+        }
+        return output;
+    }
+
+    isArray = Array.isArray;
+    if (!isArray) {
+        isArray = function isArray(ary) {
+            return Object.prototype.toString.call(ary) === '[object Array]';
+        };
+    }
+
+    hasOwnProperty = (function () {
+        var func = Object.prototype.hasOwnProperty;
+        return function hasOwnProperty(obj, name) {
+            return func.call(obj, name);
+        };
+    }());
+
+    function shallowCopy(obj) {
+        var ret = {}, key;
+        for (key in obj) {
+            if (obj.hasOwnProperty(key)) {
+                ret[key] = obj[key];
+            }
+        }
+        return ret;
+    }
+
+    function isLineTerminator(ch) {
+        return ch === '\n' || ch === '\r' || ch === '\u2028' || ch === '\u2029';
+    }
+
+    function isWhiteSpace(ch) {
+        return (ch === ' ') || (ch === '\u0009') || (ch === '\u000B') ||
+            (ch === '\u000C') || (ch === '\u00A0') ||
+            (ch.charCodeAt(0) >= 0x1680 &&
+             '\u1680\u180E\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\uFEFF'.indexOf(ch) >= 0);
+    }
+
+    function isDecimalDigit(ch) {
+        return '0123456789'.indexOf(ch) >= 0;
+    }
+
+    function isHexDigit(ch) {
+        return '0123456789abcdefABCDEF'.indexOf(ch) >= 0;
+    }
+
+    function isOctalDigit(ch) {
+        return '01234567'.indexOf(ch) >= 0;
+    }
+
+    function isASCIIAlphanumeric(ch) {
+        return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9');
+    }
+
+    function isIdentifierStart(ch) {
+        return (ch === '$') || (ch === '_') || (ch === '\\') ||
+            (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
+            ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierStart.test(ch));
+    }
+
+    function isIdentifierPart(ch) {
+        return (ch === '$') || (ch === '_') || (ch === '\\') ||
+            (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') ||
+            ((ch >= '0') && (ch <= '9')) ||
+            ((ch.charCodeAt(0) >= 0x80) && Regex.NonAsciiIdentifierPart.test(ch));
+    }
+
+    function isTypeName(ch) {
+        return '><(){}[],:*|?!='.indexOf(ch) === -1 && !isWhiteSpace(ch) && !isLineTerminator(ch);
+    }
+
+    function isParamTitle(title) {
+        return title === 'param' || title === 'argument' || title === 'arg';
+    }
+
+    function isProperty(title) {
+        return title === 'property' || title === 'prop';
+    }
+
+    function isNameParameterRequired(title) {
+        return isParamTitle(title) || isProperty(title) ||
+            title === 'alias' || title === 'this' || title === 'mixes' || title === 'requires';
+    }
+
+    function isAllowedName(title) {
+        return isNameParameterRequired(title) || title === 'const' || title === 'constant';
+    }
+
+    function isAllowedNested(title) {
+        return isProperty(title) || isParamTitle(title);
+    }
+
+    function isTypeParameterRequired(title) {
+        return isParamTitle(title) || title === 'define' || title === 'enum' ||
+            title === 'implements' || title === 'return' ||
+            title === 'this' || title === 'type' || title === 'typedef' ||
+            title === 'returns' || isProperty(title);
+    }
+
+    // Consider deprecation instead using 'isTypeParameterRequired' and 'Rules' declaration to pick when a type is optional/required
+    // This would require changes to 'parseType'
+    function isAllowedType(title) {
+        return isTypeParameterRequired(title) || title === 'throws' || title === 'const' || title === 'constant' ||
+            title === 'namespace' || title === 'member' || title === 'var' || title === 'module' ||
+            title === 'constructor' || title === 'class' || title === 'extends' || title === 'augments' ||
+            title === 'public' || title === 'private' || title === 'protected';
+    }
+
+    function DoctrineError(message) {
+        this.name = 'DoctrineError';
+        this.message = message;
+    }
+    DoctrineError.prototype = new Error();
+    DoctrineError.prototype.constructor = DoctrineError;
+
+    function throwError(message) {
+        throw new DoctrineError(message);
+    }
+
+    function assert(cond, text) {
+        if (VERSION.slice(-3) === 'dev') {
+            if (!cond) {
+                throwError(text);
+            }
+        }
+    }
+
+    function trim(str) {
+        return str.replace(/^\s+/, '').replace(/\s+$/, '');
+    }
+
+    function unwrapComment(doc) {
+        // JSDoc comment is following form
+        //   /**
+        //    * .......
+        //    */
+        // remove /**, */ and *
+        var BEFORE_STAR = 0,
+            STAR = 1,
+            AFTER_STAR = 2,
+            index,
+            len,
+            mode,
+            result,
+            ch;
+
+        doc = doc.replace(/^\/\*\*?/, '').replace(/\*\/$/, '');
+        index = 0;
+        len = doc.length;
+        mode = BEFORE_STAR;
+        result = '';
+
+        while (index < len) {
+            ch = doc[index];
+            switch (mode) {
+            case BEFORE_STAR:
+                if (isLineTerminator(ch)) {
+                    result += ch;
+                } else if (ch === '*') {
+                    mode = STAR;
+                } else if (!isWhiteSpace(ch)) {
+                    result += ch;
+                    mode = AFTER_STAR;
+                }
+                break;
+
+            case STAR:
+                if (!isWhiteSpace(ch)) {
+                    result += ch;
+                }
+                mode = isLineTerminator(ch) ? BEFORE_STAR : AFTER_STAR;
+                break;
+
+            case AFTER_STAR:
+                result += ch;
+                if (isLineTerminator(ch)) {
+                    mode = BEFORE_STAR;
+                }
+                break;
+            }
+            index += 1;
+        }
+
+        return result;
+    }
+
+    // Type Expression Parser
+
+    (function (exports) {
+        var Syntax,
+            Token,
+            source,
+            length,
+            index,
+            previous,
+            token,
+            value;
+
+        Syntax = {
+            NullableLiteral: 'NullableLiteral',
+            AllLiteral: 'AllLiteral',
+            NullLiteral: 'NullLiteral',
+            UndefinedLiteral: 'UndefinedLiteral',
+            VoidLiteral: 'VoidLiteral',
+            UnionType: 'UnionType',
+            ArrayType: 'ArrayType',
+            RecordType: 'RecordType',
+            FieldType: 'FieldType',
+            FunctionType: 'FunctionType',
+            ParameterType: 'ParameterType',
+            RestType: 'RestType',
+            NonNullableType: 'NonNullableType',
+            OptionalType: 'OptionalType',
+            NullableType: 'NullableType',
+            NameExpression: 'NameExpression',
+            TypeApplication: 'TypeApplication'
+        };
+
+        Token = {
+            ILLEGAL: 0,    // ILLEGAL
+            DOT: 1,        // .
+            DOT_LT: 2,     // .<
+            REST: 3,       // ...
+            LT: 4,         // <
+            GT: 5,         // >
+            LPAREN: 6,     // (
+            RPAREN: 7,     // )
+            LBRACE: 8,     // {
+            RBRACE: 9,     // }
+            LBRACK: 10,    // [
+            RBRACK: 11,    // ]
+            COMMA: 12,     // ,
+            COLON: 13,     // :
+            STAR: 14,      // *
+            PIPE: 15,      // |
+            QUESTION: 16,  // ?
+            BANG: 17,      // !
+            EQUAL: 18,     // =
+            NAME: 19,      // name token
+            STRING: 20,    // string
+            NUMBER: 21,    // number
+            EOF: 22
+        };
+
+        function Context(previous, index, token, value) {
+            this._previous = previous;
+            this._index = index;
+            this._token = token;
+            this._value = value;
+        }
+
+        Context.prototype.restore = function () {
+            previous = this._previous;
+            index = this._index;
+            token = this._token;
+            value = this._value;
+        };
+
+        Context.save = function () {
+            return new Context(previous, index, token, value);
+        };
+
+        function advance() {
+            var ch = source[index];
+            index += 1;
+            return ch;
+        }
+
+        function scanHexEscape(prefix) {
+            var i, len, ch, code = 0;
+
+            len = (prefix === 'u') ? 4 : 2;
+            for (i = 0; i < len; ++i) {
+                if (index < length && isHexDigit(source[index])) {
+                    ch = advance();
+                    code = code * 16 + '0123456789abcdef'.indexOf(ch.toLowerCase());
+                } else {
+                    return '';
+                }
+            }
+            return String.fromCharCode(code);
+        }
+
+        function scanString() {
+            var str = '', quote, ch, code, unescaped, restore; //TODO review removal octal = false
+            quote = source[index];
+            ++index;
+
+            while (index < length) {
+                ch = advance();
+
+                if (ch === quote) {
+                    quote = '';
+                    break;
+                } else if (ch === '\\') {
+                    ch = advance();
+                    if (!isLineTerminator(ch)) {
+                        switch (ch) {
+                        case 'n':
+                            str += '\n';
+                            break;
+                        case 'r':
+                            str += '\r';
+                            break;
+                        case 't':
+                            str += '\t';
+                            break;
+                        case 'u':
+                        case 'x':
+                            restore = index;
+                            unescaped = scanHexEscape(ch);
+                            if (unescaped) {
+                                str += unescaped;
+                            } else {
+                                index = restore;
+                                str += ch;
+                            }
+                            break;
+                        case 'b':
+                            str += '\b';
+                            break;
+                        case 'f':
+                            str += '\f';
+                            break;
+                        case 'v':
+                            str += '\v';
+                            break;
+
+                        default:
+                            if (isOctalDigit(ch)) {
+                                code = '01234567'.indexOf(ch);
+
+                                // \0 is not octal escape sequence
+                                // Deprecating unused code. TODO review removal
+                                //if (code !== 0) {
+                                //    octal = true;
+                                //}
+
+                                if (index < length && isOctalDigit(source[index])) {
+                                    //TODO Review Removal octal = true;
+                                    code = code * 8 + '01234567'.indexOf(advance());
+
+                                    // 3 digits are only allowed when string starts
+                                    // with 0, 1, 2, 3
+                                    if ('0123'.indexOf(ch) >= 0 &&
+                                            index < length &&
+                                            isOctalDigit(source[index])) {
+                                        code = code * 8 + '01234567'.indexOf(advance());
+                                    }
+                                }
+                                str += String.fromCharCode(code);
+                            } else {
+                                str += ch;
+                            }
+                            break;
+                        }
+                    } else {
+                        if (ch ===  '\r' && source[index] === '\n') {
+                            ++index;
+                        }
+                    }
+                } else if (isLineTerminator(ch)) {
+                    break;
+                } else {
+                    str += ch;
+                }
+            }
+
+            if (quote !== '') {
+                throwError('unexpected quote');
+            }
+
+            value = str;
+            return Token.STRING;
+        }
+
+        function scanNumber() {
+            var number, ch;
+
+            number = '';
+            if (ch !== '.') {
+                number = advance();
+                ch = source[index];
+
+                if (number === '0') {
+                    if (ch === 'x' || ch === 'X') {
+                        number += advance();
+                        while (index < length) {
+                            ch = source[index];
+                            if (!isHexDigit(ch)) {
+                                break;
+                            }
+                            number += advance();
+                        }
+
+                        if (number.length <= 2) {
+                            // only 0x
+                            throwError('unexpected token');
+                        }
+
+                        if (index < length) {
+                            ch = source[index];
+                            if (isIdentifierStart(ch)) {
+                                throwError('unexpected token');
+                            }
+                        }
+                        value = parseInt(number, 16);
+                        return Token.NUMBER;
+                    }
+
+                    if (isOctalDigit(ch)) {
+                        number += advance();
+                        while (index < length) {
+                            ch = source[index];
+                            if (!isOctalDigit(ch)) {
+                                break;
+                            }
+                            number += advance();
+                        }
+
+                        if (index < length) {
+                            ch = source[index];
+                            if (isIdentifierStart(ch) || isDecimalDigit(ch)) {
+                                throwError('unexpected token');
+                            }
+                        }
+                        value = parseInt(number, 8);
+                        return Token.NUMBER;
+                    }
+
+                    if (isDecimalDigit(ch)) {
+                        throwError('unexpected token');
+                    }
+                }
+
+                while (index < length) {
+                    ch = source[index];
+                    if (!isDecimalDigit(ch)) {
+                        break;
+                    }
+                    number += advance();
+                }
+            }
+
+            if (ch === '.') {
+                number += advance();
+                while (index < length) {
+                    ch = source[index];
+                    if (!isDecimalDigit(ch)) {
+                        break;
+                    }
+                    number += advance();
+                }
+            }
+
+            if (ch === 'e' || ch === 'E') {
+                number += advance();
+
+                ch = source[index];
+                if (ch === '+' || ch === '-') {
+                    number += advance();
+                }
+
+                ch = source[index];
+                if (isDecimalDigit(ch)) {
+                    number += advance();
+                    while (index < length) {
+                        ch = source[index];
+                        if (!isDecimalDigit(ch)) {
+                            break;
+                        }
+                        number += advance();
+                    }
+                } else {
+                    throwError('unexpected token');
+                }
+            }
+
+            if (index < length) {
+                ch = source[index];
+                if (isIdentifierStart(ch)) {
+                    throwError('unexpected token');
+                }
+            }
+
+            value = parseFloat(number);
+            return Token.NUMBER;
+        }
+
+
+        function scanTypeName() {
+            var ch, ch2;
+
+            value = advance();
+            while (index < length && isTypeName(source[index])) {
+                ch = source[index];
+                if (ch === '.') {
+                    if ((index + 1) < length) {
+                        ch2 = source[index + 1];
+                        if (ch2 === '<') {
+                            break;
+                        }
+                    }
+                }
+                value += advance();
+            }
+            return Token.NAME;
+        }
+
+        function next() {
+            var ch;
+
+            previous = index;
+
+            while (index < length && isWhiteSpace(source[index])) {
+                advance();
+            }
+            if (index >= length) {
+                token = Token.EOF;
+                return token;
+            }
+
+            ch = source[index];
+            switch (ch) {
+            case '"':
+                token = scanString();
+                return token;
+
+            case ':':
+                advance();
+                token = Token.COLON;
+                return token;
+
+            case ',':
+                advance();
+                token = Token.COMMA;
+                return token;
+
+            case '(':
+                advance();
+                token = Token.LPAREN;
+                return token;
+
+            case ')':
+                advance();
+                token = Token.RPAREN;
+                return token;
+
+            case '[':
+                advance();
+                token = Token.LBRACK;
+                return token;
+
+            case ']':
+                advance();
+                token = Token.RBRACK;
+                return token;
+
+            case '{':
+                advance();
+                token = Token.LBRACE;
+                return token;
+
+            case '}':
+                advance();
+                token = Token.RBRACE;
+                return token;
+
+            case '.':
+                advance();
+                if (index < length) {
+                    ch = source[index];
+                    if (ch === '<') {
+                        advance();
+                        token = Token.DOT_LT;
+                        return token;
+                    }
+
+                    if (ch === '.' && index + 1 < length && source[index + 1] === '.') {
+                        advance();
+                        advance();
+                        token = Token.REST;
+                        return token;
+                    }
+
+                    if (isDecimalDigit(ch)) {
+                        token = scanNumber();
+                        return token;
+                    }
+                }
+                token = Token.DOT;
+                return token;
+
+            case '<':
+                advance();
+                token = Token.LT;
+                return token;
+
+            case '>':
+                advance();
+                token = Token.GT;
+                return token;
+
+            case '*':
+                advance();
+                token = Token.STAR;
+                return token;
+
+            case '|':
+                advance();
+                token = Token.PIPE;
+                return token;
+
+            case '?':
+                advance();
+                token = Token.QUESTION;
+                return token;
+
+            case '!':
+                advance();
+                token = Token.BANG;
+                return token;
+
+            case '=':
+                advance();
+                token = Token.EQUAL;
+                return token;
+
+            default:
+                if (isDecimalDigit(ch)) {
+                    token = scanNumber();
+                    return token;
+                }
+
+                // type string permits following case,
+                //
+                // namespace.module.MyClass
+                //
+                // this reduced 1 token TK_NAME
+                if (isTypeName(ch)) {
+                    token = scanTypeName();
+                    return token;
+                }
+
+                token = Token.ILLEGAL;
+                return token;
+            }
+        }
+
+        function consume(target, text) {
+            assert(token === target, text || 'consumed token not matched');
+            next();
+        }
+
+        function expect(target) {
+            if (token !== target) {
+                throwError('unexpected token');
+            }
+            next();
+        }
+
+        // UnionType := '(' TypeUnionList ')'
+        //
+        // TypeUnionList :=
+        //     <<empty>>
+        //   | NonemptyTypeUnionList
+        //
+        // NonemptyTypeUnionList :=
+        //     TypeExpression
+        //   | TypeExpression '|' NonemptyTypeUnionList
+        function parseUnionType() {
+            var elements;
+            consume(Token.LPAREN, 'UnionType should start with (');
+            elements = [];
+            if (token !== Token.RPAREN) {
+                while (true) {
+                    elements.push(parseTypeExpression());
+                    if (token === Token.RPAREN) {
+                        break;
+                    }
+                    expect(Token.PIPE);
+                }
+            }
+            consume(Token.RPAREN, 'UnionType should end with )');
+            return {
+                type: Syntax.UnionType,
+                elements: elements
+            };
+        }
+
+        // ArrayType := '[' ElementTypeList ']'
+        //
+        // ElementTypeList :=
+        //     <<empty>>
+        //  | TypeExpression
+        //  | '...' TypeExpression
+        //  | TypeExpression ',' ElementTypeList
+        function parseArrayType() {
+            var elements;
+            consume(Token.LBRACK, 'ArrayType should start with [');
+            elements = [];
+            while (token !== Token.RBRACK) {
+                if (token === Token.REST) {
+                    consume(Token.REST);
+                    elements.push({
+                        type: Syntax.RestType,
+                        expression: parseTypeExpression()
+                    });
+                    break;
+                } else {
+                    elements.push(parseTypeExpression());
+                }
+                if (token !== Token.RBRACK) {
+                    expect(Token.COMMA);
+                }
+            }
+            expect(Token.RBRACK);
+            return {
+                type: Syntax.ArrayType,
+                elements: elements
+            };
+        }
+
+        function parseFieldName() {
+            var v = value;
+            if (token === Token.NAME || token === Token.STRING) {
+                next();
+                return v;
+            }
+
+            if (token === Token.NUMBER) {
+                consume(Token.NUMBER);
+                return String(v);
+            }
+
+            throwError('unexpected token');
+        }
+
+        // FieldType :=
+        //     FieldName
+        //   | FieldName ':' TypeExpression
+        //
+        // FieldName :=
+        //     NameExpression
+        //   | StringLiteral
+        //   | NumberLiteral
+        //   | ReservedIdentifier
+        function parseFieldType() {
+            var key;
+
+            key = parseFieldName();
+            if (token === Token.COLON) {
+                consume(Token.COLON);
+                return {
+                    type: Syntax.FieldType,
+                    key: key,
+                    value: parseTypeExpression()
+                };
+            }
+            return {
+                type: Syntax.FieldType,
+                key: key,
+                value: null
+            };
+        }
+
+        // RecordType := '{' FieldTypeList '}'
+        //
+        // FieldTypeList :=
+        //     <<empty>>
+        //   | FieldType
+        //   | FieldType ',' FieldTypeList
+        function parseRecordType() {
+            var fields;
+
+            consume(Token.LBRACE, 'RecordType should start with {');
+            fields = [];
+            if (token === Token.COMMA) {
+                consume(Token.COMMA);
+            } else {
+                while (token !== Token.RBRACE) {
+                    fields.push(parseFieldType());
+                    if (token !== Token.RBRACE) {
+                        expect(Token.COMMA);
+                    }
+                }
+            }
+            expect(Token.RBRACE);
+            return {
+                type: Syntax.RecordType,
+                fields: fields
+            };
+        }
+
+        function parseNameExpression() {
+            var name = value;
+            expect(Token.NAME);
+            return {
+                type: Syntax.NameExpression,
+                name: name
+            };
+        }
+
+        // TypeExpressionList :=
+        //     TopLevelTypeExpression
+        //   | TopLevelTypeExpression ',' TypeExpressionList
+        function parseTypeExpressionList() {
+            var elements = [];
+
+            elements.push(parseTop());
+            while (token === Token.COMMA) {
+                consume(Token.COMMA);
+                elements.push(parseTop());
+            }
+            return elements;
+        }
+
+        // TypeName :=
+        //     NameExpression
+        //   | NameExpression TypeApplication
+        //
+        // TypeApplication :=
+        //     '.<' TypeExpressionList '>'
+        //   | '<' TypeExpressionList '>'   // this is extension of doctrine
+        function parseTypeName() {
+            var expr, applications;
+
+            expr = parseNameExpression();
+            if (token === Token.DOT_LT || token === Token.LT) {
+                next();
+                applications = parseTypeExpressionList();
+                expect(Token.GT);
+                return {
+                    type: Syntax.TypeApplication,
+                    expression: expr,
+                    applications: applications
+                };
+            }
+            return expr;
+        }
+
+        // ResultType :=
+        //     <<empty>>
+        //   | ':' void
+        //   | ':' TypeExpression
+        //
+        // BNF is above
+        // but, we remove <<empty>> pattern, so token is always TypeToken::COLON
+        function parseResultType() {
+            consume(Token.COLON, 'ResultType should start with :');
+            if (token === Token.NAME && value === 'void') {
+                consume(Token.NAME);
+                return {
+                    type: Syntax.VoidLiteral
+                };
+            }
+            return parseTypeExpression();
+        }
+
+        // ParametersType :=
+        //     RestParameterType
+        //   | NonRestParametersType
+        //   | NonRestParametersType ',' RestParameterType
+        //
+        // RestParameterType :=
+        //     '...'
+        //     '...' Identifier
+        //
+        // NonRestParametersType :=
+        //     ParameterType ',' NonRestParametersType
+        //   | ParameterType
+        //   | OptionalParametersType
+        //
+        // OptionalParametersType :=
+        //     OptionalParameterType
+        //   | OptionalParameterType, OptionalParametersType
+        //
+        // OptionalParameterType := ParameterType=
+        //
+        // ParameterType := TypeExpression | Identifier ':' TypeExpression
+        //
+        // Identifier is "new" or "this"
+        function parseParametersType() {
+            var params = [], normal = true, expr, rest = false;
+
+            while (token !== Token.RPAREN) {
+                if (token === Token.REST) {
+                    // RestParameterType
+                    consume(Token.REST);
+                    rest = true;
+                }
+
+                expr = parseTypeExpression();
+                if (expr.type === Syntax.NameExpression && token === Token.COLON) {
+                    // Identifier ':' TypeExpression
+                    consume(Token.COLON);
+                    expr = {
+                        type: Syntax.ParameterType,
+                        name: expr.name,
+                        expression: parseTypeExpression()
+                    };
+                }
+                if (token === Token.EQUAL) {
+                    consume(Token.EQUAL);
+                    expr = {
+                        type: Syntax.OptionalType,
+                        expression: expr
+                    };
+                    normal = false;
+                } else {
+                    if (!normal) {
+                        throwError('unexpected token');
+                    }
+                }
+                if (rest) {
+                    expr = {
+                        type: Syntax.RestType,
+                        expression: expr
+                    };
+                }
+                params.push(expr);
+                if (token !== Token.RPAREN) {
+                    expect(Token.COMMA);
+                }
+            }
+            return params;
+        }
+
+        // FunctionType := 'function' FunctionSignatureType
+        //
+        // FunctionSignatureType :=
+        //   | TypeParameters '(' ')' ResultType
+        //   | TypeParameters '(' ParametersType ')' ResultType
+        //   | TypeParameters '(' 'this' ':' TypeName ')' ResultType
+        //   | TypeParameters '(' 'this' ':' TypeName ',' ParametersType ')' ResultType
+        function parseFunctionType() {
+            var isNew, thisBinding, params, result, fnType;
+            assert(token === Token.NAME && value === 'function', 'FunctionType should start with \'function\'');
+            consume(Token.NAME);
+
+            // Google Closure Compiler is not implementing TypeParameters.
+            // So we do not. if we don't get '(', we see it as error.
+            expect(Token.LPAREN);
+
+            isNew = false;
+            params = [];
+            thisBinding = null;
+            if (token !== Token.RPAREN) {
+                // ParametersType or 'this'
+                if (token === Token.NAME &&
+                        (value === 'this' || value === 'new')) {
+                    // 'this' or 'new'
+                    // 'new' is Closure Compiler extension
+                    isNew = value === 'new';
+                    consume(Token.NAME);
+                    expect(Token.COLON);
+                    thisBinding = parseTypeName();
+                    if (token === Token.COMMA) {
+                        consume(Token.COMMA);
+                        params = parseParametersType();
+                    }
+                } else {
+                    params = parseParametersType();
+                }
+            }
+
+            expect(Token.RPAREN);
+
+            result = null;
+            if (token === Token.COLON) {
+                result = parseResultType();
+            }
+
+            fnType = {
+                type: Syntax.FunctionType,
+                params: params,
+                result: result
+            };
+            if (thisBinding) {
+                // avoid adding null 'new' and 'this' properties
+                fnType['this'] = thisBinding;
+                if (isNew) {
+                    fnType['new'] = true;
+                }
+            }
+            return fnType;
+        }
+
+        // BasicTypeExpression :=
+        //     '*'
+        //   | 'null'
+        //   | 'undefined'
+        //   | TypeName
+        //   | FunctionType
+        //   | UnionType
+        //   | RecordType
+        //   | ArrayType
+        function parseBasicTypeExpression() {
+            var context;
+            switch (token) {
+            case Token.STAR:
+                consume(Token.STAR);
+                return {
+                    type: Syntax.AllLiteral
+                };
+
+            case Token.LPAREN:
+                return parseUnionType();
+
+            case Token.LBRACK:
+                return parseArrayType();
+
+            case Token.LBRACE:
+                return parseRecordType();
+
+            case Token.NAME:
+                if (value === 'null') {
+                    consume(Token.NAME);
+                    return {
+                        type: Syntax.NullLiteral
+                    };
+                }
+
+                if (value === 'undefined') {
+                    consume(Token.NAME);
+                    return {
+                        type: Syntax.UndefinedLiteral
+                    };
+                }
+
+                context = Context.save();
+                if (value === 'function') {
+                    try {
+                        return parseFunctionType();
+                    } catch (e) {
+                        context.restore();
+                    }
+                }
+
+                return parseTypeName();
+
+            default:
+                throwError('unexpected token');
+            }
+        }
+
+        // TypeExpression :=
+        //     BasicTypeExpression
+        //   | '?' BasicTypeExpression
+        //   | '!' BasicTypeExpression
+        //   | BasicTypeExpression '?'
+        //   | BasicTypeExpression '!'
+        //   | '?'
+        //   | BasicTypeExpression '[]'
+        function parseTypeExpression() {
+            var expr;
+
+            if (token === Token.QUESTION) {
+                consume(Token.QUESTION);
+                if (token === Token.COMMA || token === Token.EQUAL || token === Token.RBRACE ||
+                        token === Token.RPAREN || token === Token.PIPE || token === Token.EOF ||
+                        token === Token.RBRACK) {
+                    return {
+                        type: Syntax.NullableLiteral
+                    };
+                }
+                return {
+                    type: Syntax.NullableType,
+                    expression: parseBasicTypeExpression(),
+                    prefix: true
+                };
+            }
+
+            if (token === Token.BANG) {
+                consume(Token.BANG);
+                return {
+                    type: Syntax.NonNullableType,
+                    expression: parseBasicTypeExpression(),
+                    prefix: true
+                };
+            }
+
+            expr = parseBasicTypeExpression();
+            if (token === Token.BANG) {
+                consume(Token.BANG);
+                return {
+                    type: Syntax.NonNullableType,
+                    expression: expr,
+                    prefix: false
+                };
+            }
+
+            if (token === Token.QUESTION) {
+                consume(Token.QUESTION);
+                return {
+                    type: Syntax.NullableType,
+                    expression: expr,
+                    prefix: false
+                };
+            }
+
+            if (token === Token.LBRACK) {
+                consume(Token.LBRACK);
+                consume(Token.RBRACK, 'expected an array-style type declaration (' + value + '[])');
+                return {
+                    type: Syntax.TypeApplication,
+                    expression: {
+                        type: Syntax.NameExpression,
+                        name: 'Array'
+                    },
+                    applications: [expr]
+                };
+            }
+
+            return expr;
+        }
+
+        // TopLevelTypeExpression :=
+        //      TypeExpression
+        //    | TypeUnionList
+        //
+        // This rule is Google Closure Compiler extension, not ES4
+        // like,
+        //   { number | string }
+        // If strict to ES4, we should write it as
+        //   { (number|string) }
+        function parseTop() {
+            var expr, elements;
+
+            expr = parseTypeExpression();
+            if (token !== Token.PIPE) {
+                return expr;
+            }
+
+            elements = [ expr ];
+            consume(Token.PIPE);
+            while (true) {
+                elements.push(parseTypeExpression());
+                if (token !== Token.PIPE) {
+                    break;
+                }
+                consume(Token.PIPE);
+            }
+
+            return {
+                type: Syntax.UnionType,
+                elements: elements
+            };
+        }
+
+        function parseTopParamType() {
+            var expr;
+
+            if (token === Token.REST) {
+                consume(Token.REST);
+                return {
+                    type: Syntax.RestType,
+                    expression: parseTop()
+                };
+            }
+
+            expr = parseTop();
+            if (token === Token.EQUAL) {
+                consume(Token.EQUAL);
+                return {
+                    type: Syntax.OptionalType,
+                    expression: expr
+                };
+            }
+
+            return expr;
+        }
+
+        function parseType(src, opt) {
+            var expr;
+
+            source = src;
+            length = source.length;
+            index = 0;
+            previous = 0;
+
+            if (!CanAccessStringByIndex) {
+                source = source.split('');
+            }
+
+            next();
+            expr = parseTop();
+
+            if (opt && opt.midstream) {
+                return {
+                    expression: expr,
+                    index: previous
+                };
+            }
+
+            if (token !== Token.EOF) {
+                throwError('not reach to EOF');
+            }
+
+            return expr;
+        }
+
+        function parseParamType(src, opt) {
+            var expr;
+
+            source = src;
+            length = source.length;
+            index = 0;
+            previous = 0;
+
+            if (!CanAccessStringByIndex) {
+                source = source.split('');
+            }
+
+            next();
+            expr = parseTopParamType();
+
+            if (opt && opt.midstream) {
+                return {
+                    expression: expr,
+                    index: previous
+                };
+            }
+
+            if (token !== Token.EOF) {
+                throwError('not reach to EOF');
+            }
+
+            return expr;
+        }
+
+        function stringifyImpl(node, compact, topLevel) {
+            var result, i, iz;
+
+            switch (node.type) {
+            case Syntax.NullableLiteral:
+                result = '?';
+                break;
+
+            case Syntax.AllLiteral:
+                result = '*';
+                break;
+
+            case Syntax.NullLiteral:
+                result = 'null';
+                break;
+
+            case Syntax.UndefinedLiteral:
+                result = 'undefined';
+                break;
+
+            case Syntax.VoidLiteral:
+                result = 'void';
+                break;
+
+            case Syntax.UnionType:
+                if (!topLevel) {
+                    result = '(';
+                } else {
+                    result = '';
+                }
+
+                for (i = 0, iz = node.elements.length; i < iz; ++i) {
+                    result += stringifyImpl(node.elements[i], compact);
+                    if ((i + 1) !== iz) {
+                        result += '|';
+                    }
+                }
+
+                if (!topLevel) {
+                    result += ')';
+                }
+                break;
+
+            case Syntax.ArrayType:
+                result = '[';
+                for (i = 0, iz = node.elements.length; i < iz; ++i) {
+                    result += stringifyImpl(node.elements[i], compact);
+                    if ((i + 1) !== iz) {
+                        result += compact ? ',' : ', ';
+                    }
+                }
+                result += ']';
+                break;
+
+            case Syntax.RecordType:
+                result = '{';
+                for (i = 0, iz = node.fields.length; i < iz; ++i) {
+                    result += stringifyImpl(node.fields[i], compact);
+                    if ((i + 1) !== iz) {
+                        result += compact ? ',' : ', ';
+                    }
+                }
+                result += '}';
+                break;
+
+            case Syntax.FieldType:
+                if (node.value) {
+                    result = node.key + (compact ? ':' : ': ') + stringifyImpl(node.value, compact);
+                } else {
+                    result = node.key;
+                }
+                break;
+
+            case Syntax.FunctionType:
+                result = compact ? 'function(' : 'function (';
+
+                if (node['this']) {
+                    if (node['new']) {
+                        result += (compact ? 'new:' : 'new: ');
+                    } else {
+                        result += (compact ? 'this:' : 'this: ');
+                    }
+
+                    result += stringifyImpl(node['this'], compact);
+
+                    if (node.params.length !== 0) {
+                        result += compact ? ',' : ', ';
+                    }
+                }
+
+                for (i = 0, iz = node.params.length; i < iz; ++i) {
+                    result += stringifyImpl(node.params[i], compact);
+                    if ((i + 1) !== iz) {
+                        result += compact ? ',' : ', ';
+                    }
+                }
+
+                result += ')';
+
+                if (node.result) {
+                    result += (compact ? ':' : ': ') + stringifyImpl(node.result, compact);
+                }
+                break;
+
+            case Syntax.ParameterType:
+                result = node.name + (compact ? ':' : ': ') + stringifyImpl(node.expression, compact);
+                break;
+
+            case Syntax.RestType:
+                result = '...';
+                if (node.expression) {
+                    result += stringifyImpl(node.expression, compact);
+                }
+                break;
+
+            case Syntax.NonNullableType:
+                if (node.prefix) {
+                    result = '!' + stringifyImpl(node.expression, compact);
+                } else {
+                    result = stringifyImpl(node.expression, compact) + '!';
+                }
+                break;
+
+            case Syntax.OptionalType:
+                result = stringifyImpl(node.expression, compact) + '=';
+                break;
+
+            case Syntax.NullableType:
+                if (node.prefix) {
+                    result = '?' + stringifyImpl(node.expression, compact);
+                } else {
+                    result = stringifyImpl(node.expression, compact) + '?';
+                }
+                break;
+
+            case Syntax.NameExpression:
+                result = node.name;
+                break;
+
+            case Syntax.TypeApplication:
+                result = stringifyImpl(node.expression, compact) + '.<';
+                for (i = 0, iz = node.applications.length; i < iz; ++i) {
+                    result += stringifyImpl(node.applications[i], compact);
+                    if ((i + 1) !== iz) {
+                        result += compact ? ',' : ', ';
+                    }
+                }
+                result += '>';
+                break;
+
+            default:
+                throwError('Unknown type ' + node.type);
+            }
+
+            return result;
+        }
+
+        function stringify(node, options) {
+            if (options == null) {
+                options = {};
+            }
+            return stringifyImpl(node, options.compact, options.topLevel);
+        }
+
+        exports.parseType = parseType;
+        exports.parseParamType = parseParamType;
+        exports.stringify = stringify;
+        exports.Syntax = Syntax;
+    }(typed = {}));
+
+    // JSDoc Tag Parser
+
+    (function (exports) {
+        var Rules,
+            index,
+            lineNumber,
+            lineStart,
+            length,
+            source,
+            recoverable,
+            sloppy,
+            strict;
+
+        function skipStars(index) {
+            while (index < length && isWhiteSpace(source[index]) && !isLineTerminator(source[index])) {
+                index += 1;
+            }
+            while (source[index] === '*') {
+                index += 1;
+            }
+            while (index < length && isWhiteSpace(source[index]) && !isLineTerminator(source[index])) {
+                index += 1;
+            }
+            return index;
+        }
+
+        function advance() {
+            var ch = source[index];
+            index += 1;
+            if (isLineTerminator(ch) && !(ch === '\r' && source[index] === '\n')) {
+                lineNumber += 1;
+                lineStart = index;
+                index = skipStars(index);
+            }
+            return ch;
+        }
+
+        function scanTitle() {
+            var title = '';
+            // waste '@'
+            advance();
+
+            while (index < length && isASCIIAlphanumeric(source[index])) {
+                title += advance();
+            }
+
+            return title;
+        }
+
+        function seekContent() {
+            var ch, waiting, last = index;
+
+            waiting = false;
+            while (last < length) {
+                ch = source[last];
+                if (isLineTerminator(ch) && !(ch === '\r' && source[last + 1] === '\n')) {
+                    lineNumber += 1;
+                    lineStart = last + 1;
+                    last = skipStars(last + 1) - 1;
+                    waiting = true;
+                } else if (waiting) {
+                    if (ch === '@') {
+                        break;
+                    }
+                    if (!isWhiteSpace(ch)) {
+                        waiting = false;
+                    }
+                }
+                last += 1;
+            }
+            return last;
+        }
+
+        // type expression may have nest brace, such as,
+        // { { ok: string } }
+        //
+        // therefore, scanning type expression with balancing braces.
+        function parseType(title, last) {
+            var ch, brace, type, direct = false;
+
+            // search '{'
+            while (index < last) {
+                ch = source[index];
+                if (isWhiteSpace(ch)) {
+                    advance();
+                } else if (ch === '{') {
+                    advance();
+                    break;
+                } else {
+                    // this is direct pattern
+                    direct = true;
+                    break;
+                }
+            }
+
+            if (!direct) {
+                // type expression { is found
+                brace = 1;
+                type = '';
+                while (index < last) {
+                    ch = source[index];
+                    if (isLineTerminator(ch)) {
+                        advance();
+                    } else {
+                        if (ch === '}') {
+                            brace -= 1;
+                            if (brace === 0) {
+                                advance();
+                                break;
+                            }
+                        } else if (ch === '{') {
+                            brace += 1;
+                        }
+                        type += advance();
+                    }
+                }
+
+                if (brace !== 0) {
+                    // braces is not balanced
+                    return throwError('Braces are not balanced');
+                }
+
+                try {
+                    if (isParamTitle(title)) {
+                        return typed.parseParamType(type);
+                    }
+                    return typed.parseType(type);
+                } catch (e1) {
+                    // parse failed
+                    return null;
+                }
+            } else {
+                return null;
+            }
+        }
+
+        function scanIdentifier(last) {
+            var identifier;
+            if (!isIdentifierStart(source[index])) {
+                return null;
+            }
+            identifier = advance();
+            while (index < last && isIdentifierPart(source[index])) {
+                identifier += advance();
+            }
+            return identifier;
+        }
+
+        function skipWhiteSpace(last) {
+            while (index < last && (isWhiteSpace(source[index]) || isLineTerminator(source[index]))) {
+                advance();
+            }
+        }
+
+        function parseName(last, allowBrackets, allowNestedParams) {
+            var name = '', useBrackets;
+
+            skipWhiteSpace(last);
+
+            if (index >= last) {
+                return null;
+            }
+
+            if (allowBrackets && source[index] === '[') {
+                useBrackets = true;
+                name = advance();
+            }
+
+            if (!isIdentifierStart(source[index])) {
+                return null;
+            }
+
+            name += scanIdentifier(last);
+
+            if (allowNestedParams) {
+                while (source[index] === '.' || source[index] === '#' || source[index] === '~') {
+                    name += source[index];
+                    index += 1;
+                    name += scanIdentifier(last);
+                }
+            }
+
+            if (useBrackets) {
+                // do we have a default value for this?
+                if (source[index] === '=') {
+
+                    // consume the '='' symbol
+                    name += advance();
+                    // scan in the default value
+                    while (index < last && source[index] !== ']') {
+                        name += advance();
+                    }
+                }
+
+                if (index >= last  || source[index] !== ']') {
+                    // we never found a closing ']'
+                    return null;
+                }
+
+                // collect the last ']'
+                name += advance();
+            }
+
+            return name;
+        }
+
+        function skipToTag() {
+            while (index < length && source[index] !== '@') {
+                advance();
+            }
+            if (index >= length) {
+                return false;
+            }
+            assert(source[index] === '@');
+            return true;
+        }
+
+        function TagParser(options, title) {
+            this._options = options;
+            this._title = title;
+            this._tag = {
+                title: title,
+                description: null
+            };
+            if (this._options.lineNumbers) {
+                this._tag.lineNumber = lineNumber;
+            }
+            this._last = 0;
+            // space to save special information for title parsers.
+            this._extra = { };
+        }
+
+        // addError(err, ...)
+        TagParser.prototype.addError = function addError(errorText) {
+            var args = Array.prototype.slice.call(arguments, 1),
+                msg = errorText.replace(
+                    /%(\d)/g,
+                    function (whole, index) {
+                        assert(index < args.length, 'Message reference must be in range');
+                        return args[index];
+                    }
+                );
+
+            if (!this._tag.errors) {
+                this._tag.errors = [];
+            }
+            if (strict) {
+                throwError(msg);
+            }
+            this._tag.errors.push(msg);
+            return recoverable;
+        };
+
+        TagParser.prototype.parseType = function () {
+            // type required titles
+            if (isTypeParameterRequired(this._title)) {
+                try {
+                    this._tag.type = parseType(this._title, this._last);
+                    if (!this._tag.type) {
+                        if (!isParamTitle(this._title)) {
+                            if (!this.addError('Missing or invalid tag type')) {
+                                return false;
+                            }
+                        }
+                    }
+                } catch (error) {
+                    this._tag.type = null;
+                    if (!this.addError(error.message)) {
+                        return false;
+                    }
+                }
+            } else if (isAllowedType(this._title)) {
+                // optional types
+                try {
+                    this._tag.type = parseType(this._title, this._last);
+                } catch (e) {
+                    //For optional types, lets drop the thrown error when we hit the end of the file
+                }
+            }
+            return true;
+        };
+
+        TagParser.prototype._parseNamePath = function (optional) {
+            var name;
+            name = parseName(this._last, sloppy && isParamTitle(this._title), true);
+            if (!name) {
+                if (!optional) {
+                    if (!this.addError('Missing or invalid tag name')) {
+                        return false;
+                    }
+                }
+            }
+            this._tag.name = name;
+            return true;
+        };
+
+        TagParser.prototype.parseNamePath = function () {
+            return this._parseNamePath(false);
+        };
+
+        TagParser.prototype.parseNamePathOptional = function () {
+            return this._parseNamePath(true);
+        };
+
+
+        TagParser.prototype.parseName = function () {
+            var assign, name;
+
+            // param, property requires name
+            if (isAllowedName(this._title)) {
+                this._tag.name = parseName(this._last, sloppy && isParamTitle(this._title), isAllowedNested(this._title));
+                if (!this._tag.name) {
+                    if (!isNameParameterRequired(this._title)) {
+                        return true;
+                    }
+
+                    // it's possible the name has already been parsed but interpreted as a type
+                    // it's also possible this is a sloppy declaration, in which case it will be
+                    // fixed at the end
+                    if (isParamTitle(this._title) && this._tag.type && this._tag.type.name) {
+                        this._extra.name = this._tag.type;
+                        this._tag.name = this._tag.type.name;
+                        this._tag.type = null;
+                    } else {
+                        if (!this.addError('Missing or invalid tag name')) {
+                            return false;
+                        }
+                    }
+                } else {
+                    name = this._tag.name;
+                    if (name.charAt(0) === '[' && name.charAt(name.length - 1) === ']') {
+                        // extract the default value if there is one
+                        // example: @param {string} [somebody=John Doe] description
+                        assign = name.substring(1, name.length - 1).split('=');
+                        if (assign[1]) {
+                            this._tag['default'] = assign[1];
+                        }
+                        this._tag.name = assign[0];
+
+                        // convert to an optional type
+                        if (this._tag.type && this._tag.type.type !== 'OptionalType') {
+                            this._tag.type = {
+                                type: 'OptionalType',
+                                expression: this._tag.type
+                            };
+                        }
+                    }
+                }
+            }
+
+            return true;
+        };
+
+        TagParser.prototype.parseDescription = function parseDescription() {
+            var description = trim(sliceSource(source, index, this._last));
+            if (description) {
+                if ((/^-\s+/).test(description)) {
+                    description = description.substring(2);
+                }
+                if (this._options.unwrap) {
+                    description = description.replace(/^\s*\*+\s*/gm, '');
+                }
+                this._tag.description = description;
+            }
+            return true;
+        };
+
+        TagParser.prototype.parseKind = function parseKind() {
+            var kind, kinds;
+            kinds = {
+                'class': true,
+                'constant': true,
+                'event': true,
+                'external': true,
+                'file': true,
+                'function': true,
+                'member': true,
+                'mixin': true,
+                'module': true,
+                'namespace': true,
+                'typedef': true
+            };
+            kind = trim(sliceSource(source, index, this._last));
+            this._tag.kind = kind;
+            if (!hasOwnProperty(kinds, kind)) {
+                if (!this.addError('Invalid kind name \'%0\'', kind)) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        TagParser.prototype.parseAccess = function parseAccess() {
+            var access;
+            access = trim(sliceSource(source, index, this._last));
+            this._tag.access = access;
+            if (access !== 'private' && access !== 'protected' && access !== 'public') {
+                if (!this.addError('Invalid access name \'%0\'', access)) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        TagParser.prototype.parseVariation = function parseVariation() {
+            var variation, text;
+            text = trim(sliceSource(source, index, this._last));
+            variation = parseFloat(text, 10);
+            this._tag.variation = variation;
+            if (isNaN(variation)) {
+                if (!this.addError('Invalid variation \'%0\'', text)) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        TagParser.prototype.ensureEnd = function () {
+            var shouldBeEmpty = trim(sliceSource(source, index, this._last));
+            if (!shouldBeEmpty.match(/^[\s*]*$/)) {
+                if (!this.addError('Unknown content \'%0\'', shouldBeEmpty)) {
+                    return false;
+                }
+            }
+            return true;
+        };
+
+        TagParser.prototype.epilogue = function epilogue() {
+            var description;
+
+            description = this._tag.description;
+            // un-fix potentially sloppy declaration
+            if (isParamTitle(this._title) && !this._tag.type && description && description.charAt(0) === '[') {
+                this._tag.type = this._extra.name;
+                this._tag.name = undefined;
+
+                if (!sloppy) {
+                    if (!this.addError('Missing or invalid tag name')) {
+                        return false;
+                    }
+                }
+            }
+
+            return true;
+        };
+
+        Rules = {
+            // http://usejsdoc.org/tags-access.html
+            'access': ['parseAccess'],
+            // http://usejsdoc.org/tags-alias.html
+            'alias': ['parseNamePath', 'ensureEnd'],
+            // http://usejsdoc.org/tags-augments.html
+            'augments': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-constructor.html
+            'constructor': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // Synonym: http://usejsdoc.org/tags-constructor.html
+            'class': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // Synonym: http://usejsdoc.org/tags-extends.html
+            'extends': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-deprecated.html
+            'deprecated': ['parseDescription'],
+            // http://usejsdoc.org/tags-global.html
+            'global': ['ensureEnd'],
+            // http://usejsdoc.org/tags-inner.html
+            'inner': ['ensureEnd'],
+            // http://usejsdoc.org/tags-instance.html
+            'instance': ['ensureEnd'],
+            // http://usejsdoc.org/tags-kind.html
+            'kind': ['parseKind'],
+            // http://usejsdoc.org/tags-mixes.html
+            'mixes': ['parseNamePath', 'ensureEnd'],
+            // http://usejsdoc.org/tags-mixin.html
+            'mixin': ['parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-member.html
+            'member': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-method.html
+            'method': ['parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-module.html
+            'module': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // Synonym: http://usejsdoc.org/tags-method.html
+            'func': ['parseNamePathOptional', 'ensureEnd'],
+            // Synonym: http://usejsdoc.org/tags-method.html
+            'function': ['parseNamePathOptional', 'ensureEnd'],
+            // Synonym: http://usejsdoc.org/tags-member.html
+            'var': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-name.html
+            'name': ['parseNamePath', 'ensureEnd'],
+            // http://usejsdoc.org/tags-namespace.html
+            'namespace': ['parseType', 'parseNamePathOptional', 'ensureEnd'],
+            // http://usejsdoc.org/tags-private.html
+            'private': ['parseType', 'parseDescription'],
+            // http://usejsdoc.org/tags-protected.html
+            'protected': ['parseType', 'parseDescription'],
+            // http://usejsdoc.org/tags-public.html
+            'public': ['parseType', 'parseDescription'],
+            // http://usejsdoc.org/tags-readonly.html
+            'readonly': ['ensureEnd'],
+            // http://usejsdoc.org/tags-requires.html
+            'requires': ['parseNamePath', 'ensureEnd'],
+            // http://usejsdoc.org/tags-since.html
+            'since': ['parseDescription'],
+            // http://usejsdoc.org/tags-static.html
+            'static': ['ensureEnd'],
+            // http://usejsdoc.org/tags-summary.html
+            'summary': ['parseDescription'],
+            // http://usejsdoc.org/tags-this.html
+            'this': ['parseNamePath', 'ensureEnd'],
+            // http://usejsdoc.org/tags-todo.html
+            'todo': ['parseDescription'],
+            // http://usejsdoc.org/tags-variation.html
+            'variation': ['parseVariation'],
+            // http://usejsdoc.org/tags-version.html
+            'version': ['parseDescription']
+        };
+
+        TagParser.prototype.parse = function parse() {
+            var i, iz, sequences, method,
+                oldLineNumber, oldLineStart,
+                newLineNumber, newLineStart;
+
+            // empty title
+            if (!this._title) {
+                if (!this.addError('Missing or invalid title')) {
+                    return null;
+                }
+            }
+
+            // Seek to content last index.
+            oldLineNumber = lineNumber;
+            oldLineStart = lineStart;
+            this._last = seekContent(this._title);
+            newLineNumber = lineNumber;
+            newLineStart = lineStart;
+            lineNumber = oldLineNumber;
+            lineStart = oldLineStart;
+
+            if (hasOwnProperty(Rules, this._title)) {
+                sequences = Rules[this._title];
+            } else {
+                // default sequences
+                sequences = ['parseType', 'parseName', 'parseDescription', 'epilogue'];
+            }
+
+            for (i = 0, iz = sequences.length; i < iz; ++i) {
+                method = sequences[i];
+                if (!this[method]()) {
+                    return null;
+                }
+            }
+
+            // Seek global index to end of this tag.
+            index = this._last;
+            lineNumber = newLineNumber;
+            lineStart = newLineStart;
+            return this._tag;
+        };
+
+        function parseTag(options) {
+            var title, parser, startLine, startColumn, res;
+
+            // skip to tag
+            if (!skipToTag()) {
+                return null;
+            }
+
+            if (options.lineNumbers) {
+                startLine = lineNumber;
+                startColumn = index - lineStart;
+            }
+
+            // scan title
+            title = scanTitle();
+
+            // construct tag parser
+            parser = new TagParser(options, title);
+            res = parser.parse();
+
+            if (options.lineNumbers) {
+                res.startLine = startLine;
+                res.startColumn = startColumn;
+            }
+
+            return res;
+        }
+
+        //
+        // Parse JSDoc
+        //
+
+        function scanJSDocDescription() {
+            var description = '', ch, atAllowed;
+
+            atAllowed = true;
+            while (index < length) {
+                ch = source[index];
+
+                if (atAllowed && ch === '@') {
+                    break;
+                }
+
+                if (isLineTerminator(ch)) {
+                    atAllowed = true;
+                } else if (atAllowed && !isWhiteSpace(ch)) {
+                    atAllowed = false;
+                }
+
+                description += advance();
+            }
+            return trim(description);
+        }
+
+        function parse(comment, options) {
+            var tags = [], tag, description, interestingTags, i, iz;
+
+            if (options === undefined) {
+                options = {};
+            }
+
+            if (typeof options.unwrap === 'boolean' && options.unwrap) {
+                source = comment.replace(/^\/?\*+/, '').replace(/\*+\/?$/, '');
+            } else {
+                source = comment;
+            }
+
+            // array of relevant tags
+            if (options.tags) {
+                if (isArray(options.tags)) {
+                    interestingTags = { };
+                    for (i = 0, iz = options.tags.length; i < iz; i++) {
+                        if (typeof options.tags[i] === 'string') {
+                            interestingTags[options.tags[i]] = true;
+                        } else {
+                            throwError('Invalid "tags" parameter: ' + options.tags);
+                        }
+                    }
+                } else {
+                    throwError('Invalid "tags" parameter: ' + options.tags);
+                }
+            }
+
+            if (!CanAccessStringByIndex) {
+                source = source.split('');
+            }
+
+            length = source.length;
+            index = 0;
+            lineNumber = 0;
+            lineStart = 0;
+            recoverable = options.recoverable;
+            sloppy = options.sloppy;
+            strict = options.strict;
+
+            description = scanJSDocDescription();
+
+            while (true) {
+                tag = parseTag(options);
+                if (!tag) {
+                    break;
+                }
+                if (!interestingTags || interestingTags.hasOwnProperty(tag.title)) {
+                    tags.push(tag);
+                }
+            }
+
+            return {
+                description: description,
+                tags: tags
+            };
+        }
+        exports.parse = parse;
+    }(jsdoc = {}));
+
+    exports.version = VERSION;
+    exports.parse = jsdoc.parse;
+    exports.parseType = typed.parseType;
+    exports.parseParamType = typed.parseParamType;
+    exports.unwrapComment = unwrapComment;
+    exports.Syntax = shallowCopy(typed.Syntax);
+    exports.Error = DoctrineError;
+    exports.type = {
+        Syntax: exports.Syntax,
+        parseType: typed.parseType,
+        parseParamType: typed.parseParamType,
+        stringify: typed.stringify
+    };
+}(typeof exports === 'undefined' ? (doctrine = {}) : exports));
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/javascript/extractor/lib/external/doctrine/eslint.json b/javascript/extractor/lib/external/doctrine/eslint.json
new file mode 100644
index 00000000000..330835b9bf7
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/eslint.json
@@ -0,0 +1,22 @@
+{
+  "env": {
+    "node": true
+  },
+  "rules": {
+    "quotes": [2, "single"],
+    "valid-jsdoc": [2, true],
+    "brace-style": [2, true],
+    "semi": [2, true],
+    "no-bitwise": [2, true],
+    "camelcase": [2, true],
+    "curly": [2, true],
+    "eqeqeq": [2, "allow-null"],
+    "wrap-iife": [2, true],
+    "eqeqeq": [2, true],
+    "strict": [2, true],
+    "no-unused-vars": [2, true],
+    "no-underscore-dangle": [0, false],
+    "no-use-before-define": [0, false],
+    "no-constant-condition": [0, false]
+  }
+}
diff --git a/javascript/extractor/lib/external/doctrine/package.json b/javascript/extractor/lib/external/doctrine/package.json
new file mode 100644
index 00000000000..a2e633f2322
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/package.json
@@ -0,0 +1,34 @@
+{
+    "name": "doctrine",
+    "description": "JSDoc parser",
+    "homepage": "http://github.com/Constellation/doctrine.html",
+    "main": "doctrine.js",
+    "version": "0.5.3-dev",
+    "engines": {
+        "node": ">=0.10.0"
+    },
+    "maintainers": [{
+        "name": "Yusuke Suzuki",
+        "email": "utatane.tea@gmail.com",
+        "web": "http://github.com/Constellation"
+    }],
+    "repository": {
+        "type": "git",
+        "url": "http://github.com/Constellation/doctrine.git"
+    },
+    "devDependencies": {
+        "jslint": "~0.1.9",
+        "eslint": "~0.6.2",
+        "mocha": "*",
+        "should": "*"
+    },
+    "licenses": [{
+        "type": "BSD",
+        "url": "http://github.com/Constellation/doctrine/raw/master/LICENSE.BSD"
+    }],
+    "scripts": {
+        "test": "npm run-script lint && npm run-script eslint && ./node_modules/.bin/mocha",
+        "lint": "node_modules/jslint/bin/jslint.js doctrine.js",
+        "eslint": "node_modules/eslint/bin/eslint.js -c eslint.json doctrine.js"
+    }
+}
diff --git a/javascript/extractor/lib/external/doctrine/test/parse.js b/javascript/extractor/lib/external/doctrine/test/parse.js
new file mode 100644
index 00000000000..f5e43823a71
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/test/parse.js
@@ -0,0 +1,1888 @@
+/*
+  Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*global require describe it*/
+/*jslint node:true */
+'use strict';
+
+var doctrine = require('../doctrine');
+require('should');
+
+describe('parse', function () {
+    it('alias', function () {
+        var res = doctrine.parse('/** @alias */', { unwrap: true });
+        res.tags.should.have.length(0);
+    });
+
+    it('alias with name', function () {
+        var res = doctrine.parse('/** @alias aliasName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'alias');
+        res.tags[0].should.have.property('name', 'aliasName');
+    });
+
+    it('alias with namepath', function () {
+        var res = doctrine.parse('/** @alias aliasName.OK */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'alias');
+        res.tags[0].should.have.property('name', 'aliasName.OK');
+    });
+
+    it('const', function () {
+        var res = doctrine.parse('/** @const */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'const');
+    });
+
+    it('const with name', function () {
+        var res = doctrine.parse('/** @const constname */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'const');
+        res.tags[0].should.have.property('name', 'constname');
+    });
+
+    it('constant with name', function () {
+        var res = doctrine.parse('/** @constant constname */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'constant');
+        res.tags[0].should.have.property('name', 'constname');
+    });
+
+    it('const with type and name', function () {
+        var res = doctrine.parse('/** @const {String} constname */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'const');
+        res.tags[0].should.have.property('name', 'constname');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('constant with type and name', function () {
+        var res = doctrine.parse('/** @constant {String} constname */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'constant');
+        res.tags[0].should.have.property('name', 'constname');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('const multiple', function () {
+        var res = doctrine.parse("/**@const\n @const*/", { unwrap: true });
+        res.tags.should.have.length(2);
+        res.tags[0].should.have.property('title', 'const');
+        res.tags[1].should.have.property('title', 'const');
+    });
+
+    it('const double', function () {
+        var res = doctrine.parse("/**@const\n @const*/", { unwrap: true });
+        res.tags.should.have.length(2);
+        res.tags[0].should.have.property('title', 'const');
+        res.tags[1].should.have.property('title', 'const');
+    });
+
+    it('const triple', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @const @const",
+                " * @const @const",
+                " * @const @const",
+                " */"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(3);
+        res.tags[0].should.have.property('title', 'const');
+        res.tags[1].should.have.property('title', 'const');
+        res.tags[2].should.have.property('title', 'const');
+    });
+
+    it('constructor', function () {
+        var res = doctrine.parse('/** @constructor */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'constructor');
+    });
+
+    it('constructor with type', function () {
+        var res = doctrine.parse('/** @constructor {Object} */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'constructor');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('constructor with type and name', function () {
+        var res = doctrine.parse('/** @constructor {Object} objName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'constructor');
+        res.tags[0].should.have.property('name', 'objName');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('class', function () {
+        var res = doctrine.parse('/** @class */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'class');
+    });
+
+    it('class with type', function () {
+        var res = doctrine.parse('/** @class {Object} */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'class');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('class with type and name', function () {
+        var res = doctrine.parse('/** @class {Object} objName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'class');
+        res.tags[0].should.have.property('name', 'objName');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('deprecated', function () {
+        var res = doctrine.parse('/** @deprecated */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'deprecated');
+    });
+
+    it('deprecated', function () {
+        var res = doctrine.parse('/** @deprecated some text here describing why it is deprecated */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'deprecated');
+        res.tags[0].should.have.property('description', 'some text here describing why it is deprecated');
+    });
+
+    it('func', function () {
+        var res = doctrine.parse('/** @func */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'func');
+    });
+
+    it('func with name', function () {
+        var res = doctrine.parse('/** @func thingName.func */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'func');
+        res.tags[0].should.have.property('name', 'thingName.func');
+    });
+
+    it('func with type', function () {
+        var res = doctrine.parse('/** @func {Object} thingName.func */', { unwrap: true });
+        res.tags.should.have.length(0);
+        // func does not accept type
+    });
+
+    it('function', function () {
+        var res = doctrine.parse('/** @function */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'function');
+    });
+
+    it('function with name', function () {
+        var res = doctrine.parse('/** @function thingName.function */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'function');
+        res.tags[0].should.have.property('name', 'thingName.function');
+    });
+
+    it('function with type', function () {
+        var res = doctrine.parse('/** @function {Object} thingName.function */', { unwrap: true });
+        res.tags.should.have.length(0);
+        // function does not accept type
+    });
+
+    it('member', function () {
+        var res = doctrine.parse('/** @member */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'member');
+    });
+
+    it('member with name', function () {
+        var res = doctrine.parse('/** @member thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'member');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('member with type', function () {
+        var res = doctrine.parse('/** @member {Object} thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'member');
+        res.tags[0].should.have.property('name', 'thingName.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('method', function () {
+        var res = doctrine.parse('/** @method */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'method');
+    });
+
+    it('method with name', function () {
+        var res = doctrine.parse('/** @method thingName.function */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'method');
+        res.tags[0].should.have.property('name', 'thingName.function');
+    });
+
+    it('method with type', function () {
+        var res = doctrine.parse('/** @method {Object} thingName.function */', { unwrap: true });
+        res.tags.should.have.length(0);
+        // method does not accept type
+    });
+
+    it('mixes', function () {
+        var res = doctrine.parse('/** @mixes */', { unwrap: true });
+        res.tags.should.have.length(0);
+    });
+
+    it('mixes with name', function () {
+        var res = doctrine.parse('/** @mixes thingName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'mixes');
+        res.tags[0].should.have.property('name', 'thingName');
+    });
+
+    it('mixes with namepath', function () {
+        var res = doctrine.parse('/** @mixes thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'mixes');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('mixin', function () {
+        var res = doctrine.parse('/** @mixin */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'mixin');
+    });
+
+    it('mixin with name', function () {
+        var res = doctrine.parse('/** @mixin thingName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'mixin');
+        res.tags[0].should.have.property('name', 'thingName');
+    });
+
+    it('mixin with namepath', function () {
+        var res = doctrine.parse('/** @mixin thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'mixin');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('module', function () {
+        var res = doctrine.parse('/** @module */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'module');
+    });
+
+    it('module with name', function () {
+        var res = doctrine.parse('/** @module thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'module');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('module with type', function () {
+        var res = doctrine.parse('/** @module {Object} thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'module');
+        res.tags[0].should.have.property('name', 'thingName.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('name', function () {
+        var res = doctrine.parse('/** @name thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'name');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('name', function () {
+        var res = doctrine.parse('/** @name thingName#name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'name');
+        res.tags[0].should.have.property('name', 'thingName#name');
+    });
+
+    it('name', function () {
+        var res = doctrine.parse('/** @name thingName~name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'name');
+        res.tags[0].should.have.property('name', 'thingName~name');
+    });
+
+    it('name', function () {
+        var res = doctrine.parse('/** @name {thing} thingName.name */', { unwrap: true });
+        // name does not accept type
+        res.tags.should.have.length(0);
+    });
+
+    it('namespace', function () {
+        var res = doctrine.parse('/** @namespace */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'namespace');
+    });
+
+    it('namespace with name', function () {
+        var res = doctrine.parse('/** @namespace thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'namespace');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('namespace with type', function () {
+        var res = doctrine.parse('/** @namespace {Object} thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'namespace');
+        res.tags[0].should.have.property('name', 'thingName.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('param', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {String} userName",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'userName');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('param with properties', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {String} user.name",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'user.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('arg with properties', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @arg {String} user.name",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'arg');
+        res.tags[0].should.have.property('name', 'user.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('argument with properties', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @argument {String} user.name",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'argument');
+        res.tags[0].should.have.property('name', 'user.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('param typeless', function () {
+        var res = doctrine.parse(
+        [
+            "/**",
+            " * @param userName",
+            "*/"
+        ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.eql({
+            title: 'param',
+            type: null,
+            name: 'userName',
+            description: null
+        });
+
+        var res = doctrine.parse(
+        [
+            "/**",
+            " * @param userName Something descriptive",
+            "*/"
+        ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.eql({
+            title: 'param',
+            type: null,
+            name: 'userName',
+            description: 'Something descriptive'
+        });
+
+        var res = doctrine.parse(
+        [
+            "/**",
+            " * @param user.name Something descriptive",
+            "*/"
+        ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.eql({
+            title: 'param',
+            type: null,
+            name: 'user.name',
+            description: 'Something descriptive'
+        });
+    });
+
+    it('param broken', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {String} userName",
+                " * @param {String userName",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'userName');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'String'
+        });
+    });
+
+    it('param record', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {{ok:String}} userName",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'userName');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'RecordType',
+            fields: [{
+                type: 'FieldType',
+                key: 'ok',
+                value: {
+                    type: 'NameExpression',
+                    name: 'String'
+                }
+            }]
+        });
+    });
+
+    it('param record broken', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {{ok:String} userName",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.be.empty;
+    });
+
+    it('param multiple lines', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {string|",
+                " *     number} userName",
+                " * }}",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'userName');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'UnionType',
+            elements: [{
+                type: 'NameExpression',
+                name: 'string'
+            }, {
+                type: 'NameExpression',
+                name: 'number'
+            }]
+        });
+    });
+
+    it('param without braces', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param string name description",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'string');
+        res.tags[0].should.have.property('type', null);
+        res.tags[0].should.have.property('description', 'name description');
+    });
+
+    it('param w/ hyphen before description', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {string} name - description",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.eql({
+            title: 'param',
+            type: {
+                type: 'NameExpression',
+                name: 'string'
+            },
+            name: 'name',
+            description: 'description'
+        });
+    });
+
+    it('param w/ hyphen + leading space before description', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {string} name -   description",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.eql({
+            title: 'param',
+            type: {
+                type: 'NameExpression',
+                name: 'string'
+            },
+            name: 'name',
+            description: '  description'
+        });
+    });
+
+    it('description and param separated by blank line', function () {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * Description",
+                " * blah blah blah",
+                " *",
+                " * @param {string} name description",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.description.should.eql('Description\nblah blah blah');
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'string'
+        });
+        res.tags[0].should.have.property('description', 'description');
+    });
+
+    it('regular block comment instead of jsdoc-style block comment', function () {
+        var res = doctrine.parse(
+            [
+                "/*",
+                " * Description",
+                " * blah blah blah",
+                "*/"
+            ].join('\n'), { unwrap: true });
+        res.description.should.eql("Description\nblah blah blah");
+    });
+
+    it('augments', function () {
+        var res = doctrine.parse('/** @augments */', { unwrap: true });
+        res.tags.should.have.length(1);
+    });
+
+    it('augments with name', function () {
+        var res = doctrine.parse('/** @augments ClassName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'augments');
+        res.tags[0].should.have.property('name', 'ClassName');
+    });
+
+    it('augments with type', function () {
+        var res = doctrine.parse('/** @augments {ClassName} */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'augments');
+        res.tags[0].should.have.property('type', {
+          type: 'NameExpression',
+          name: 'ClassName'
+        });
+    });
+
+    it('augments with name', function () {
+        var res = doctrine.parse('/** @augments ClassName.OK */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'augments');
+        res.tags[0].should.have.property('name', 'ClassName.OK');
+    });
+
+    it('extends', function () {
+        var res = doctrine.parse('/** @extends */', { unwrap: true });
+        res.tags.should.have.length(1);
+    });
+
+    it('extends with name', function () {
+        var res = doctrine.parse('/** @extends ClassName */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'extends');
+        res.tags[0].should.have.property('name', 'ClassName');
+    });
+
+    it('extends with type', function () {
+        var res = doctrine.parse('/** @extends {ClassName} */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'extends');
+        res.tags[0].should.have.property('type', {
+          type: 'NameExpression',
+          name: 'ClassName'
+        });
+    });
+
+    it('extends with namepath', function () {
+        var res = doctrine.parse('/** @extends ClassName.OK */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'extends');
+        res.tags[0].should.have.property('name', 'ClassName.OK');
+    });
+
+    it('prop', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @prop {string} thingName - does some stuff",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'prop');
+        res.tags[0].should.have.property('description', 'does some stuff');
+        res.tags[0].type.should.have.property('name', 'string');
+        res.tags[0].should.have.property('name', 'thingName');
+    });
+
+    it('prop without type', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @prop thingName - does some stuff",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(0);
+    });
+
+
+    it('property', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @property {string} thingName - does some stuff",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'property');
+        res.tags[0].should.have.property('description', 'does some stuff');
+        res.tags[0].type.should.have.property('name', 'string');
+        res.tags[0].should.have.property('name', 'thingName');
+    });
+
+    it('property without type', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @property thingName - does some stuff",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(0);
+    });
+
+    it('property with nested name', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @property {string} thingName.name - does some stuff",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'property');
+        res.tags[0].should.have.property('description', 'does some stuff');
+        res.tags[0].type.should.have.property('name', 'string');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('throws', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @throws {Error} if something goes wrong",
+              " */"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'throws');
+        res.tags[0].should.have.property('description', 'if something goes wrong');
+        res.tags[0].type.should.have.property('name', 'Error');
+    });
+
+    it('throws without type', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @throws if something goes wrong",
+              " */"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'throws');
+        res.tags[0].should.have.property('description', 'if something goes wrong');
+    });
+
+    it('kind', function () {
+        var res = doctrine.parse('/** @kind class */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'kind');
+        res.tags[0].should.have.property('kind', 'class');
+    });
+
+    it('kind error', function () {
+        var res = doctrine.parse('/** @kind ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Invalid kind name \'ng\'');
+    });
+
+    it('todo', function () {
+        var res = doctrine.parse('/** @todo Write the documentation */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'todo');
+        res.tags[0].should.have.property('description', 'Write the documentation');
+    });
+
+    it('summary', function () {
+        // japanese lang
+        var res = doctrine.parse('/** @summary ゆるゆり3期����ー */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'summary');
+        res.tags[0].should.have.property('description', 'ゆるゆり3期����ー');
+    });
+
+    it('variation', function () {
+        // japanese lang
+        var res = doctrine.parse('/** @variation 42 */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'variation');
+        res.tags[0].should.have.property('variation', 42);
+    });
+
+    it('variation error', function () {
+        // japanese lang
+        var res = doctrine.parse('/** @variation Animation */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Invalid variation \'Animation\'');
+    });
+
+    it('access', function () {
+        var res = doctrine.parse('/** @access public */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'access');
+        res.tags[0].should.have.property('access', 'public');
+    });
+
+    it('access error', function () {
+        var res = doctrine.parse('/** @access ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Invalid access name \'ng\'');
+    });
+
+    it('public', function () {
+        var res = doctrine.parse('/** @public */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'public');
+    });
+
+    it('public type and description', function () {
+        var res = doctrine.parse('/** @public {number} ok */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'public');
+        res.tags[0].should.have.property('description', 'ok');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'number'
+        });
+    });
+
+    it('protected', function () {
+        var res = doctrine.parse('/** @protected */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'protected');
+    });
+
+    it('protected type and description', function () {
+        var res = doctrine.parse('/** @protected {number} ok */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'protected');
+        res.tags[0].should.have.property('description', 'ok');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'number'
+        });
+    });
+
+    it('private', function () {
+        var res = doctrine.parse('/** @private */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'private');
+    });
+
+    it('private type and description', function () {
+        var res = doctrine.parse('/** @private {number} ok */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'private');
+        res.tags[0].should.have.property('description', 'ok');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'number'
+        });
+    });
+
+    it('readonly', function () {
+        var res = doctrine.parse('/** @readonly */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'readonly');
+    });
+
+    it('readonly error', function () {
+        var res = doctrine.parse('/** @readonly ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Unknown content \'ng\'');
+    });
+
+    it('requires', function () {
+        var res = doctrine.parse('/** @requires */', { unwrap: true });
+        res.tags.should.have.length(0);
+    });
+
+    it('requires with module name', function () {
+        var res = doctrine.parse('/** @requires name.path */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'requires');
+        res.tags[0].should.have.property('name', 'name.path');
+    });
+
+    it('global', function () {
+        var res = doctrine.parse('/** @global */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'global');
+    });
+
+    it('global error', function () {
+        var res = doctrine.parse('/** @global ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Unknown content \'ng\'');
+    });
+
+    it('inner', function () {
+        var res = doctrine.parse('/** @inner */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'inner');
+    });
+
+    it('inner error', function () {
+        var res = doctrine.parse('/** @inner ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Unknown content \'ng\'');
+    });
+
+    it('instance', function () {
+        var res = doctrine.parse('/** @instance */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'instance');
+    });
+
+    it('instance error', function () {
+        var res = doctrine.parse('/** @instance ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Unknown content \'ng\'');
+    });
+
+    it('since', function () {
+        var res = doctrine.parse('/** @since 1.2.1 */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'since');
+        res.tags[0].should.have.property('description', '1.2.1');
+    });
+
+    it('static', function () {
+        var res = doctrine.parse('/** @static */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'static');
+    });
+
+    it('static error', function () {
+        var res = doctrine.parse('/** @static ng */', { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Unknown content \'ng\'');
+    });
+
+    it('this', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @this thingName",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'this');
+        res.tags[0].should.have.property('name', 'thingName');
+    });
+
+    it('this with namepath', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @this thingName.name",
+              "*/"
+            ].join('\n'), { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'this');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('this error', function () {
+        var res = doctrine.parse(
+            [
+              "/**",
+              " * @this",
+              "*/"
+            ].join('\n'), { unwrap: true, recoverable: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'this');
+        res.tags[0].should.have.property('errors');
+        res.tags[0].errors.should.have.length(1);
+        res.tags[0].errors[0].should.equal('Missing or invalid tag name');
+    });
+
+    it('var', function () {
+        var res = doctrine.parse('/** @var */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'var');
+    });
+
+    it('var with name', function () {
+        var res = doctrine.parse('/** @var thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'var');
+        res.tags[0].should.have.property('name', 'thingName.name');
+    });
+
+    it('var with type', function () {
+        var res = doctrine.parse('/** @var {Object} thingName.name */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'var');
+        res.tags[0].should.have.property('name', 'thingName.name');
+        res.tags[0].should.have.property('type');
+        res.tags[0].type.should.eql({
+            type: 'NameExpression',
+            name: 'Object'
+        });
+    });
+
+    it('version', function () {
+        var res = doctrine.parse('/** @version 1.2.1 */', { unwrap: true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'version');
+        res.tags[0].should.have.property('description', '1.2.1');
+    });
+
+});
+
+describe('parseType', function () {
+    it('union type closure-compiler extended', function () {
+        var type = doctrine.parseType("string|number");
+        type.should.eql({
+            type: 'UnionType',
+            elements: [{
+                type: 'NameExpression',
+                name: 'string'
+            }, {
+                type: 'NameExpression',
+                name: 'number'
+            }]
+        });
+    });
+
+    it('empty union type', function () {
+        var type = doctrine.parseType("()");
+        type.should.eql({
+            type: 'UnionType',
+            elements: []
+        });
+    });
+
+    it('comma last array type', function () {
+        var type = doctrine.parseType("[string,]");
+        type.should.eql({
+            type: 'ArrayType',
+            elements: [{
+                type: 'NameExpression',
+                name: 'string'
+            }]
+        });
+    });
+
+    it('array type of all literal', function () {
+        var type = doctrine.parseType("[*]");
+        type.should.eql({
+            type: 'ArrayType',
+            elements: [{
+                type: 'AllLiteral'
+            }]
+        });
+    });
+
+    it('array type of nullable literal', function () {
+        var type = doctrine.parseType("[?]");
+        type.should.eql({
+            type: 'ArrayType',
+            elements: [{
+                type: 'NullableLiteral'
+            }]
+        });
+    });
+
+    it('comma last record type', function () {
+        var type = doctrine.parseType("{,}");
+        type.should.eql({
+            type: 'RecordType',
+            fields: []
+        });
+    });
+
+    it('type application', function () {
+        var type = doctrine.parseType("Array.<String>");
+        type.should.eql({
+            type: 'TypeApplication',
+            expression: {
+                type: 'NameExpression',
+                name: 'Array'
+            },
+            applications: [{
+                type: 'NameExpression',
+                name: 'String'
+            }]
+        });
+    });
+
+    it('type application with multiple patterns', function () {
+        var type = doctrine.parseType("Array.<String, Number>");
+        type.should.eql({
+            type: 'TypeApplication',
+            expression: {
+                type: 'NameExpression',
+                name: 'Array'
+            },
+            applications: [{
+                type: 'NameExpression',
+                name: 'String'
+            }, {
+                type: 'NameExpression',
+                name: 'Number'
+            }]
+        });
+    });
+
+    it('type application without dot', function () {
+        var type = doctrine.parseType("Array<String>");
+        type.should.eql({
+            type: 'TypeApplication',
+            expression: {
+                type: 'NameExpression',
+                name: 'Array'
+            },
+            applications: [{
+                type: 'NameExpression',
+                name: 'String'
+            }]
+        });
+    });
+
+    it('array-style type application', function () {
+        var type = doctrine.parseType("String[]");
+        type.should.eql({
+            type: 'TypeApplication',
+            expression: {
+                type: 'NameExpression',
+                name: 'Array'
+            },
+            applications: [{
+                type: 'NameExpression',
+                name: 'String'
+            }]
+        });
+    });
+
+    it('function type simple', function () {
+        var type = doctrine.parseType("function()");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [],
+		 "result": null
+		});
+    });
+
+    it('function type with name', function () {
+        var type = doctrine.parseType("function(a)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		{
+		   "type": "NameExpression",
+		   "name": "a"
+		  }
+			 ],
+		 "result": null
+		});
+    });
+    it('function type with name and type', function () {
+        var type = doctrine.parseType("function(a:b)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+		   "type": "ParameterType",
+		   "name": "a",
+		   "expression": {
+		    "type": "NameExpression",
+		    "name": "b"
+		   }
+		  }
+		 ],
+		 "result": null
+		});
+    });
+    it('function type with optional param', function () {
+        var type = doctrine.parseType("function(a=)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+		   "type": "OptionalType",
+		   "expression": {
+		    "type": "NameExpression",
+		    "name": "a"
+		   }
+		  }
+		 ],
+		 "result": null
+		});
+    });
+    it('function type with optional param name and type', function () {
+        var type = doctrine.parseType("function(a:b=)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+		   "type": "OptionalType",
+		   "expression": {
+		    "type": "ParameterType",
+		    "name": "a",
+		    "expression": {
+		     "type": "NameExpression",
+		     "name": "b"
+		    }
+		   }
+		  }
+		 ],
+		 "result": null
+		});
+    });
+    it('function type with rest param', function () {
+        var type = doctrine.parseType("function(...a)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+		   "type": "RestType",
+		   "expression": {
+		    "type": "NameExpression",
+		    "name": "a"
+		   }
+		  }
+		 ],
+		 "result": null
+		});
+    });
+    it('function type with rest param name and type', function () {
+        var type = doctrine.parseType("function(...a:b)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+		   "type": "RestType",
+		   "expression": {
+		    "type": "ParameterType",
+		    "name": "a",
+		    "expression": {
+		     "type": "NameExpression",
+		     "name": "b"
+		    }
+		   }
+		  }
+		 ],
+		 "result": null
+		});
+    });
+
+    it('function type with optional rest param', function () {
+        var type = doctrine.parseType("function(...a=)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+			"type": "RestType",
+			"expression": {
+			   "type": "OptionalType",
+			   "expression": {
+			    "type": "NameExpression",
+			    "name": "a"
+			   }
+			  }
+			}
+		 ],
+		 "result": null
+		});
+    });
+    it('function type with optional rest param name and type', function () {
+        var type = doctrine.parseType("function(...a:b=)");
+        type.should.eql({
+		 "type": "FunctionType",
+		 "params": [
+		  {
+			"type": "RestType",
+			"expression": {
+			   "type": "OptionalType",
+			   "expression": {
+			    "type": "ParameterType",
+			    "name": "a",
+			    "expression": {
+			     "type": "NameExpression",
+			     "name": "b"
+			    }
+			  }
+			}
+		 }],
+		 "result": null
+		});
+    });
+});
+
+describe('parseParamType', function () {
+    it('question', function () {
+        var type = doctrine.parseParamType("?");
+        type.should.eql({
+            type: 'NullableLiteral'
+        });
+    });
+
+    it('question option', function () {
+        var type = doctrine.parseParamType("?=");
+        type.should.eql({
+            type: 'OptionalType',
+            expression: {
+                type: 'NullableLiteral'
+            }
+        });
+    });
+
+    it('function option parameters former', function () {
+        var type = doctrine.parseParamType("function(?, number)");
+        type.should.eql({
+            type: 'FunctionType',
+            params: [{
+                type: 'NullableLiteral'
+            }, {
+                type: 'NameExpression',
+                name: 'number'
+            }],
+            result: null
+        });
+    });
+
+    it('function option parameters latter', function () {
+        var type = doctrine.parseParamType("function(number, ?)");
+        type.should.eql({
+            type: 'FunctionType',
+            params: [{
+                type: 'NameExpression',
+                name: 'number'
+            }, {
+                type: 'NullableLiteral'
+            }],
+            result: null
+        });
+    });
+
+    it('function type union', function () {
+        var type = doctrine.parseParamType("function(): ?|number");
+        type.should.eql({
+            type: 'UnionType',
+            elements: [{
+                type: 'FunctionType',
+                params: [],
+                result: {
+                    type: 'NullableLiteral'
+                }
+            }, {
+                type: 'NameExpression',
+                name: 'number'
+            }]
+        });
+    });
+});
+
+describe('invalid', function () {
+    it('empty union pipe', function () {
+        doctrine.parseType.bind(doctrine, "(|)").should.throw();
+        doctrine.parseType.bind(doctrine, "(string|)").should.throw();
+        doctrine.parseType.bind(doctrine, "(string||)").should.throw();
+    });
+
+    it('comma only array type', function () {
+        doctrine.parseType.bind(doctrine, "[,]").should.throw();
+    });
+
+    it('comma only record type', function () {
+        doctrine.parseType.bind(doctrine, "{,,}").should.throw();
+    });
+});
+
+describe('tags option', function() {
+	it ('only param', function() {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @const @const",
+                " * @param {String} y",
+                " */"
+            ].join('\n'), { tags: ['param'], unwrap:true });
+        res.tags.should.have.length(1);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'y');
+     });
+
+	it ('param and type', function() {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @const x",
+                " * @param {String} y",
+                " * @type {String} ",
+                " */"
+            ].join('\n'), { tags: ['param', 'type'], unwrap:true });
+        res.tags.should.have.length(2);
+        res.tags[0].should.have.property('title', 'param');
+        res.tags[0].should.have.property('name', 'y');
+        res.tags[1].should.have.property('title', 'type');
+        res.tags[1].should.have.property('type');
+        res.tags[1].type.should.have.property('name', 'String');
+     });
+
+});
+
+describe('invalid tags', function() {
+	it ('bad tag 1', function() {
+        doctrine.parse.bind(doctrine,
+            [
+                "/**",
+                " * @param {String} hucairz",
+                " */"
+            ].join('\n'), { tags: 1, unwrap:true }).should.throw();
+     });
+
+	it ('bad tag 2', function() {
+        doctrine.parse.bind(doctrine,
+            [
+                "/**",
+                " * @param {String} hucairz",
+                " */"
+            ].join('\n'), { tags: ['a', 1], unwrap:true }).should.throw();
+     });
+});
+
+describe('optional params', function() {
+
+    // should fail since sloppy option not set
+    it('failure 0', function() {
+        doctrine.parse(
+        ["/**", " * @param {String} [val]", " */"].join('\n'), {
+            unwrap: true
+        }).should.eql({
+            "description": "",
+            "tags": []
+        });
+    });
+    it('success 1', function() {
+        doctrine.parse(
+        ["/**", " * @param {String} [val]", " */"].join('\n'), {
+            unwrap: true, sloppy: true
+        }).should.eql({
+            "description": "",
+            "tags": [{
+                "title": "param",
+                "description": null,
+                "type": {
+                    "type": "OptionalType",
+                    "expression": {
+                        "type": "NameExpression",
+                        "name": "String"
+                    }
+                },
+                "name": "val"
+            }]
+        });
+    });
+    it('success 2', function() {
+        doctrine.parse(
+        ["/**", " * @param {String=} val", " */"].join('\n'), {
+            unwrap: true, sloppy: true
+        }).should.eql({
+            "description": "",
+            "tags": [{
+                "title": "param",
+                "description": null,
+                "type": {
+                    "type": "OptionalType",
+                    "expression": {
+                        "type": "NameExpression",
+                        "name": "String"
+                    }
+                },
+                "name": "val"
+            }]
+        });
+    });
+
+    it('success 3', function() {
+        doctrine.parse(
+            ["/**", " * @param {String=} [val=abc] some description", " */"].join('\n'),
+            { unwrap: true, sloppy: true}
+        ).should.eql({
+            "description": "",
+            "tags": [{
+                "title": "param",
+                "description": "some description",
+                "type": {
+                    "type": "OptionalType",
+                    "expression": {
+                        "type": "NameExpression",
+                        "name": "String"
+                    }
+                },
+                "name": "val",
+                "default": "abc"
+            }]
+        });
+    });
+
+    it('line numbers', function() {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {string} foo",
+                " * @returns {string}",
+                " *",
+                " * @example",
+                " * f('blah'); // => undefined",
+                " */"
+            ].join('\n'),
+            { unwrap: true, lineNumbers: true }
+        );
+
+        res.tags[0].should.have.property('lineNumber', 1);
+        res.tags[1].should.have.property('lineNumber', 2);
+        res.tags[2].should.have.property('lineNumber', 4);
+    });
+
+    it('should handle \\r\\n line endings correctly', function() {
+        var res = doctrine.parse(
+            [
+                "/**",
+                " * @param {string} foo",
+                " * @returns {string}",
+                " *",
+                " * @example",
+                " * f('blah'); // => undefined",
+                " */"
+            ].join('\r\n'),
+            { unwrap: true, lineNumbers: true }
+        );
+
+        res.tags[0].should.have.property('lineNumber', 1);
+        res.tags[1].should.have.property('lineNumber', 2);
+        res.tags[2].should.have.property('lineNumber', 4);
+    });
+});
+
+describe('recovery tests', function() {
+	it ('params 2', function () {
+		var res = doctrine.parse(
+            [
+                "@param f",
+                "@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // ensure both parameters are OK
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', 'param');
+         res.tags[0].should.have.property('type', null);
+         res.tags[0].should.have.property('name', 'f');
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('params 2', function () {
+		var res = doctrine.parse(
+            [
+                "@param string f",
+                "@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // ensure first parameter is OK even with invalid type name
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', 'param');
+         res.tags[0].should.have.property('type', null);
+         res.tags[0].should.have.property('name', 'string');
+         res.tags[0].should.have.property('description', 'f');
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('return 1', function() {
+		var res = doctrine.parse(
+            [
+                "@returns"
+            ].join('\n'), { recoverable: true });
+
+         // return tag should exist
+         res.tags.should.have.length(1);
+         res.tags[0].should.have.property('title', 'returns');
+         // Since @returns requires type parameter, its type value becomes
+         // undefined. But property exists.
+         res.tags[0].should.have.property('type', undefined);
+	});
+	it ('return 2', function() {
+		var res = doctrine.parse(
+            [
+                "@returns",
+				"@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // return tag should exist as well as next tag
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', 'returns');
+         // Since @returns requires type parameter, its type value becomes
+         // undefined. But property exists.
+         res.tags[0].should.have.property('type', undefined);
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('extra @ 1', function() {
+		var res = doctrine.parse(
+            [
+                "@",
+                "@returns",
+				"@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // empty tag name shouldn't affect subsequent tags
+         res.tags.should.have.length(3);
+         res.tags[0].should.have.property('title', '');
+         res.tags[0].should.not.have.property('type');
+
+         res.tags[1].should.have.property('title', 'returns');
+         // Since @returns requires type parameter, its type value becomes
+         // undefined. But property exists.
+         res.tags[1].should.have.property('type', undefined);
+
+         res.tags[2].should.have.property('title', 'param');
+         res.tags[2].should.have.property('type');
+         res.tags[2].type.should.have.property('name', 'string');
+         res.tags[2].type.should.have.property('type', 'NameExpression');
+         res.tags[2].should.have.property('name', 'f2');
+	});
+
+	it ('extra @ 2', function() {
+		var res = doctrine.parse(
+            [
+                "@ invalid name",
+				"@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // empty tag name shouldn't affect subsequent tags
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', '');
+         res.tags[0].should.not.have.property('type');
+         res.tags[0].should.not.have.property('name');
+         res.tags[0].should.have.property('description', 'invalid name');
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('invalid tag 1', function() {
+		var res = doctrine.parse(
+            [
+                "@111 invalid name",
+				"@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // invalid tag name shouldn't affect subsequent tags
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', '111');
+         res.tags[0].should.not.have.property('type');
+         res.tags[0].should.not.have.property('name');
+         res.tags[0].should.have.property('description', 'invalid name');
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('invalid tag 1', function() {
+		var res = doctrine.parse(
+            [
+                "@111",
+				"@param {string} f2"
+            ].join('\n'), { recoverable: true });
+
+         // invalid tag name shouldn't affect subsequent tags
+         res.tags.should.have.length(2);
+         res.tags[0].should.have.property('title', '111');
+         res.tags[0].should.not.have.property('type');
+         res.tags[0].should.not.have.property('name');
+         res.tags[0].should.have.property('description', null);
+
+         res.tags[1].should.have.property('title', 'param');
+         res.tags[1].should.have.property('type');
+         res.tags[1].type.should.have.property('name', 'string');
+         res.tags[1].type.should.have.property('type', 'NameExpression');
+         res.tags[1].should.have.property('name', 'f2');
+	});
+
+	it ('should not crash on bad type in @param without name', function() {
+		var res = doctrine.parse("@param {Function(DOMNode)}",
+                                         { recoverable: true });
+        });
+
+	it ('should not crash on bad type in @param in sloppy mode', function() {
+		var res = doctrine.parse("@param {int[} [x]",
+                                         { sloppy: true });
+        });
+});
+
+describe('exported Syntax', function() {
+	it ('members', function () {
+        doctrine.Syntax.should.eql({
+            NullableLiteral: 'NullableLiteral',
+            AllLiteral: 'AllLiteral',
+            NullLiteral: 'NullLiteral',
+            UndefinedLiteral: 'UndefinedLiteral',
+            VoidLiteral: 'VoidLiteral',
+            UnionType: 'UnionType',
+            ArrayType: 'ArrayType',
+            RecordType: 'RecordType',
+            FieldType: 'FieldType',
+            FunctionType: 'FunctionType',
+            ParameterType: 'ParameterType',
+            RestType: 'RestType',
+            NonNullableType: 'NonNullableType',
+            OptionalType: 'OptionalType',
+            NullableType: 'NullableType',
+            NameExpression: 'NameExpression',
+            TypeApplication: 'TypeApplication'
+        });
+    });
+});
+
+describe('@ mark contained descriptions', function () {
+    it ('comment description #10', function () {
+        doctrine.parse(
+            [
+                '/**',
+                ' * Prevents the default action. It is equivalent to',
+                ' * {@code e.preventDefault()}, but can be used as the callback argument of',
+                ' * {@link goog.events.listen} without declaring another function.',
+                ' * @param {!goog.events.Event} e An event.',
+                ' */'
+            ].join('\n'),
+            { unwrap: true, sloppy: true }).should.eql({
+            'description': 'Prevents the default action. It is equivalent to\n{@code e.preventDefault()}, but can be used as the callback argument of\n{@link goog.events.listen} without declaring another function.',
+            'tags': [{
+                'title': 'param',
+                'description': 'An event.',
+                'type': {
+                    'type': 'NonNullableType',
+                    'expression': {
+                        'type': 'NameExpression',
+                        'name': 'goog.events.Event'
+                    },
+                    'prefix': true
+                },
+                'name': 'e'
+            }]
+        });
+    });
+
+    it ('tag description', function () {
+        doctrine.parse(
+            [
+                '/**',
+                ' * Prevents the default action. It is equivalent to',
+                ' * @param {!goog.events.Event} e An event.',
+                ' * {@code e.preventDefault()}, but can be used as the callback argument of',
+                ' * {@link goog.events.listen} without declaring another function.',
+                ' */'
+            ].join('\n'),
+            { unwrap: true, sloppy: true }).should.eql({
+            'description': 'Prevents the default action. It is equivalent to',
+            'tags': [{
+                'title': 'param',
+                'description': 'An event.\n{@code e.preventDefault()}, but can be used as the callback argument of\n{@link goog.events.listen} without declaring another function.',
+                'type': {
+                    'type': 'NonNullableType',
+                    'expression': {
+                        'type': 'NameExpression',
+                        'name': 'goog.events.Event'
+                    },
+                    'prefix': true
+                },
+                'name': 'e'
+            }]
+        });
+    });
+});
+
+describe('function', function () {
+    it ('recognize "function" type', function () {
+		var res = doctrine.parse(
+            [
+                "@param {function} foo description",
+            ].join('\n'), {});
+         res.tags.should.have.length(1);
+         res.tags[0].should.have.property('title', 'param');
+         res.tags[0].should.have.property('type');
+         res.tags[0].type.should.eql({
+             "name": "function",
+             "type": "NameExpression"
+         });
+         res.tags[0].should.have.property('name', 'foo');
+         res.tags[0].should.have.property('description', 'description');
+    });
+});
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/javascript/extractor/lib/external/doctrine/test/strict.js b/javascript/extractor/lib/external/doctrine/test/strict.js
new file mode 100644
index 00000000000..b28a6d2025a
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/test/strict.js
@@ -0,0 +1,165 @@
+/*
+  Copyright (C) 2014 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*global require describe it*/
+/*jslint node:true */
+'use strict';
+
+var doctrine = require('../doctrine');
+require('should');
+
+describe('strict parse', function () {
+    // https://github.com/Constellation/doctrine/issues/21
+    it('unbalanced braces', function () {
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * @param {const",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Braces are not balanced');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * @param {const",
+                    " */"
+                ].join('\n'), { unwrap: true });
+        }).should.not.throw();
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @param {string name Param description",
+                    " * @param {int} foo Bar",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Braces are not balanced');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @param {string name Param description",
+                    " * @param {int} foo Bar",
+                    " */"
+                ].join('\n'), { unwrap: true });
+        }).should.not.throw();
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @returns {int",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Braces are not balanced');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @returns {int",
+                    " */"
+                ].join('\n'), { unwrap: true });
+        }).should.not.throw();
+    });
+
+    // https://github.com/Constellation/doctrine/issues/21
+    it('incorrect tag starting with @@', function () {
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * @@version",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Missing or invalid title');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * @@version",
+                    " */"
+                ].join('\n'), { unwrap: true });
+        }).should.not.throw();
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @@param {string} name Param description",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Missing or invalid title');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @@param {string} name Param description",
+                    " */"
+                ].join('\n'), { unwrap: true });
+        }).should.not.throw();
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @kind ng",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Invalid kind name \'ng\'');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @variation Animation",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Invalid variation \'Animation\'');
+
+        (function () {
+            doctrine.parse(
+                [
+                    "/**",
+                    " * Description",
+                    " * @access ng",
+                    " */"
+                ].join('\n'), { unwrap: true, strict: true });
+        }).should.throw('Invalid access name \'ng\'');
+    });
+});
diff --git a/javascript/extractor/lib/external/doctrine/test/stringify.js b/javascript/extractor/lib/external/doctrine/test/stringify.js
new file mode 100644
index 00000000000..4c37197e1a8
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/test/stringify.js
@@ -0,0 +1,410 @@
+/*
+  Copyright (C) 2013 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/*global require describe it*/
+/*jslint node:true */
+'use strict';
+
+var doctrine = require('../doctrine');
+var assert = require('assert');
+require('should');
+
+// tests for the stringify function.  
+// ensure that we can parse and then stringify and the results are identical
+describe('stringify', function () {
+    
+    function testStringify(text) {
+        it (text, function() {
+            var result = doctrine.parse("@param {" + text + "} name");
+            //    console.log("Parse Tree: " + JSON.stringify(result, null, " "));
+            var stringed = doctrine.type.stringify(result.tags[0].type, {compact:true});
+            stringed.should.equal(text);
+        });
+    }
+    
+    // simple
+    testStringify("String");
+    testStringify("*");
+    testStringify("null");
+    testStringify("undefined");
+    testStringify("void");
+    //testStringify("?=");  // Failing
+    
+    // rest
+    testStringify("...string");
+    testStringify("...[string]");
+    testStringify("...[[string]]");
+    
+    // optional, nullable, nonnullable
+    testStringify("string=");
+    testStringify("?string");
+    testStringify("!string");
+    testStringify("!string=");
+
+    // type applications
+    testStringify("Array.<String>");
+    testStringify("Array.<String,Number>");
+
+    // union types
+    testStringify("()");
+    testStringify("(String|Number)");
+
+    // Arrays
+    testStringify("[String]");
+    testStringify("[String,Number]");
+    testStringify("[(String|Number)]");
+
+    // Record types
+    testStringify("{a}");
+    testStringify("{a:String}");
+    testStringify("{a:String,b}");
+    testStringify("{a:String,b:object}");
+    testStringify("{a:String,b:foo.bar.baz}");
+    testStringify("{a:(String|Number),b,c:Array.<String>}");
+    testStringify("...{a:(String|Number),b,c:Array.<String>}");
+    testStringify("{a:(String|Number),b,c:Array.<String>}=");
+    
+    // fn types
+    testStringify("function(a)");
+    testStringify("function(a):String");
+    testStringify("function(a:number):String");
+    testStringify("function(a:number,b:Array.<(String|Number|Object)>):String");
+    testStringify("function(a:number,callback:function(a:Array.<(String|Number|Object)>):boolean):String");
+    testStringify("function(a:(string|number),this:string,new:true):function():number");
+    testStringify("function(a:(string|number),this:string,new:true):function(a:function(val):result):number");
+});
+
+describe('literals', function() {
+    it('NullableLiteral', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NullableLiteral
+        }).should.equal('?');
+    });
+
+    it('AllLiteral', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.AllLiteral
+        }).should.equal('*');
+    });
+
+    it('NullLiteral', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NullLiteral
+        }).should.equal('null');
+    });
+
+    it('UndefinedLiteral', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.UndefinedLiteral
+        }).should.equal('undefined');
+    });
+});
+
+describe('Expression', function () {
+    it('NameExpression', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NameExpression,
+            name: 'this.is.valid'
+        }).should.equal('this.is.valid');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NameExpression,
+            name: 'String'
+        }).should.equal('String');
+    });
+
+    it('ArrayType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.ArrayType,
+            elements: [{
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }]
+        }).should.equal('[String]');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.ArrayType,
+            elements: [{
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }, {
+                type: doctrine.Syntax.NameExpression,
+                name: 'Number'
+            }]
+        }).should.equal('[String, Number]');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.ArrayType,
+            elements: []
+        }).should.equal('[]');
+    });
+
+    it('RecordType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.RecordType,
+            fields: [{
+                type: doctrine.Syntax.FieldType,
+                key: 'name',
+                value: null
+            }]
+        }).should.equal('{name}');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.RecordType,
+            fields: [{
+                type: doctrine.Syntax.FieldType,
+                key: 'name',
+                value: {
+                    type: doctrine.Syntax.NameExpression,
+                    name: 'String'
+                }
+            }]
+        }).should.equal('{name: String}');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.RecordType,
+            fields: [{
+                type: doctrine.Syntax.FieldType,
+                key: 'string',
+                value: {
+                    type: doctrine.Syntax.NameExpression,
+                    name: 'String'
+                }
+            }, {
+                type: doctrine.Syntax.FieldType,
+                key: 'number',
+                value: {
+                    type: doctrine.Syntax.NameExpression,
+                    name: 'Number'
+                }
+            }]
+        }).should.equal('{string: String, number: Number}');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.RecordType,
+            fields: []
+        }).should.equal('{}');
+    });
+
+    it('UnionType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.UnionType,
+            elements: [{
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }]
+        }).should.equal('(String)');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.UnionType,
+            elements: [{
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }, {
+                type: doctrine.Syntax.NameExpression,
+                name: 'Number'
+            }]
+        }).should.equal('(String|Number)');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.UnionType,
+            elements: [{
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }, {
+                type: doctrine.Syntax.NameExpression,
+                name: 'Number'
+            }]
+        }, { topLevel: true }).should.equal('String|Number');
+    });
+
+    it('RestType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.RestType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }
+        }).should.equal('...String');
+    });
+
+    it('NonNullableType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NonNullableType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            },
+            prefix: true
+        }).should.equal('!String');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NonNullableType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            },
+            prefix: false
+        }).should.equal('String!');
+    });
+
+    it('OptionalType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.OptionalType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            }
+        }).should.equal('String=');
+    });
+
+    it('NullableType', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NullableType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            },
+            prefix: true
+        }).should.equal('?String');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.NullableType,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'String'
+            },
+            prefix: false
+        }).should.equal('String?');
+    });
+
+    it('TypeApplication', function () {
+        doctrine.type.stringify({
+            type: doctrine.Syntax.TypeApplication,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'Array'
+            },
+            applications: [
+                {
+                    type: doctrine.Syntax.NameExpression,
+                    name: 'String'
+                }
+            ]
+        }).should.equal('Array.<String>');
+
+        doctrine.type.stringify({
+            type: doctrine.Syntax.TypeApplication,
+            expression: {
+                type: doctrine.Syntax.NameExpression,
+                name: 'Array'
+            },
+            applications: [
+                {
+                    type: doctrine.Syntax.NameExpression,
+                    name: 'String'
+                },
+                {
+                    type: doctrine.Syntax.AllLiteral
+                }
+            ]
+        }).should.equal('Array.<String, *>');
+    });
+});
+
+describe('Complex identity', function () {
+    it('Functions', function () {
+        var data01 = 'function (): void';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data01)
+        ).should.equal(data01);
+
+        var data02 = 'function (): String';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data02)
+        ).should.equal(data02);
+
+        var data03 = 'function (test: string): String';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data03)
+        ).should.equal(data03);
+
+        var data04 = 'function (this: Date, test: String): String';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data04)
+        ).should.equal(data04);
+
+        var data05 = 'function (this: Date, a: String, b: Number): String';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data05)
+        ).should.equal(data05);
+
+        var data06 = 'function (this: Date, a: Array.<String, Number>, b: Number): String';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data06)
+        ).should.equal(data06);
+
+        var data07 = 'function (new: Date, a: Array.<String, Number>, b: Number): HashMap.<String, Number>';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data07)
+        ).should.equal(data07);
+
+        var data08 = 'function (new: Date, a: Array.<String, Number>, b: (Number|String|Date)): HashMap.<String, Number>';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data08)
+        ).should.equal(data08);
+
+        var data09 = 'function (new: Date)';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data09)
+        ).should.equal(data09);
+
+        var data10 = 'function (this: Date)';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data10)
+        ).should.equal(data10);
+
+        var data11 = 'function (this: Date, ...list)';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data11)
+        ).should.equal(data11);
+
+        var data11a = 'function (this: Date, test: String=)';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data11a)
+        ).should.equal(data11a);
+
+        // raw ... are not supported
+//        var data12 = 'function (this: Date, ...)';
+//        doctrine.type.stringify(
+//            doctrine.type.parseType(data12)
+//        ).should.equal(data12);
+
+        var data12a = 'function (this: Date, ?=)';
+        doctrine.type.stringify(
+            doctrine.type.parseType(data12a)
+        ).should.equal(data12a);
+    });
+});
+
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/javascript/extractor/lib/external/doctrine/test/test.html b/javascript/extractor/lib/external/doctrine/test/test.html
new file mode 100644
index 00000000000..3784c2e5e4e
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/test/test.html
@@ -0,0 +1,31 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
+<title>Doctrine trying</title>
+<script src="../doctrine.js"></script>
+<script type="text/javascript">
+	window.onload = function() {
+		document.getElementById("doit").onclick = function() {
+			var res = doctrine.parseParamType(document.getElementById("commenttext").value,
+				{unwrap:true, recoverable:true} );
+				
+			document.getElementById("parse_tree_res").innerHTML = JSON.stringify(res, null, ' ');
+			document.getElementById("stringify_res").textContent = doctrine.stringify(res);
+		};
+	};
+</script>
+</head>
+<body>
+	<textarea id="commenttext">Add a jsdoc comment here</textarea>
+	<br/>
+	<br/>
+	<button id="doit">Click to parse</button>
+	<br/>
+	<br/>
+	<h3>Parse Tree</h3>
+	<pre id="parse_tree_res" ></pre>
+	<h3>Stringified</h3>
+	<pre id="stringify_res" ></pre>
+</body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/lib/external/doctrine/test/unwrap.js b/javascript/extractor/lib/external/doctrine/test/unwrap.js
new file mode 100644
index 00000000000..649577fef12
--- /dev/null
+++ b/javascript/extractor/lib/external/doctrine/test/unwrap.js
@@ -0,0 +1,57 @@
+/*
+  Copyright (C) 2012 Yusuke Suzuki <utatane.tea@gmail.com>
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/*jslint node:true */
+'use strict';
+
+var doctrine = require('../doctrine');
+require('should');
+
+describe('unwrapComment', function () {
+  it('normal', function () {
+    doctrine.unwrapComment('/**\n * @const\n * @const\n */').should.equal('\n@const\n@const\n');
+  });
+
+  it('single', function () {
+    doctrine.unwrapComment('/**x*/').should.equal('x');
+  });
+
+  it('more stars', function () {
+    doctrine.unwrapComment('/***x*/').should.equal('x');
+    doctrine.unwrapComment('/****x*/').should.equal('*x');
+  });
+
+  it('2 lines', function () {
+    doctrine.unwrapComment('/**x\n * y\n*/').should.equal('x\ny\n');
+  });
+
+  it('2 lines with space', function () {
+    doctrine.unwrapComment('/**x\n *    y\n*/').should.equal('x\n   y\n');
+  });
+
+  it('3 lines with blank line', function () {
+    doctrine.unwrapComment('/**x\n *\n \* y\n*/').should.equal('x\n\ny\n');
+  });
+});
+/* vim: set sw=4 ts=4 et tw=80 : */
diff --git a/javascript/extractor/lib/typescript/.gitignore b/javascript/extractor/lib/typescript/.gitignore
new file mode 100644
index 00000000000..9d0b71a3c79
--- /dev/null
+++ b/javascript/extractor/lib/typescript/.gitignore
@@ -0,0 +1,2 @@
+build
+dist
diff --git a/javascript/extractor/lib/typescript/.yarnrc b/javascript/extractor/lib/typescript/.yarnrc
new file mode 100644
index 00000000000..7d45dca7290
--- /dev/null
+++ b/javascript/extractor/lib/typescript/.yarnrc
@@ -0,0 +1 @@
+yarn-offline-mirror "../../../../../resources/lib/yarn-mirrors/typescript-parser-wrapper/"
diff --git a/javascript/extractor/lib/typescript/package.json b/javascript/extractor/lib/typescript/package.json
new file mode 100644
index 00000000000..42431318aa7
--- /dev/null
+++ b/javascript/extractor/lib/typescript/package.json
@@ -0,0 +1,20 @@
+{
+    "name": "typescript-parser-wrapper",
+    "private": true,
+    "dependencies": {
+        "typescript": "3.0.1"
+    },
+    "scripts": {
+        "build": "tsc --project tsconfig.json && rollup -c",
+        "check": "tsc --noEmit --project . && tslint --project .",
+        "lint": "tslint --project .",
+        "lint-fix": "tslint --project . --fix"
+    },
+    "devDependencies": {
+        "@types/node": "^9.3.0",
+        "rollup": "^0.66.6",
+        "rollup-plugin-commonjs": "^9.2.0",
+        "rollup-plugin-node-resolve": "^3.4.0",
+        "tslint": "^5.9.1"
+    }
+}
diff --git a/javascript/extractor/lib/typescript/rollup.config.js b/javascript/extractor/lib/typescript/rollup.config.js
new file mode 100644
index 00000000000..e293414c70a
--- /dev/null
+++ b/javascript/extractor/lib/typescript/rollup.config.js
@@ -0,0 +1,51 @@
+import resolve from "rollup-plugin-node-resolve";
+import commonjs from "rollup-plugin-commonjs";
+import * as fs from "fs";
+import * as pathlib from "path";
+
+const copyTypeScriptFiles = (options) => ({
+  generateBundle() {
+    if (!fs.existsSync('dist')) {
+      fs.mkdirSync('dist');
+    }
+    let typescriptDir = pathlib.dirname(require.resolve("typescript"));
+    for (let file of fs.readdirSync(typescriptDir)) {
+      // Don't include bundles like `tsc.js`.
+      if (file.endsWith(".js")) continue;
+
+      // Only include library typings, not `typescript.d.ts` and friends
+      if (file.endsWith(".d.ts") && !file.startsWith("lib")) continue;
+
+      let filePath = `${typescriptDir}/${file}`;
+
+      // Skip directories. They contain locale translations and are not needed.
+      if (fs.statSync(filePath).isDirectory()) continue;
+
+      fs.copyFileSync(filePath, `dist/${file}`);
+    }
+  }
+});
+
+export default {
+  input: 'build/main.js',
+  output: {
+    file: 'dist/main.js',
+    format: 'cjs'
+  },
+  plugins: [
+    resolve(), // Resolve paths using Node.js rules
+    commonjs({ // Make rollup understand `require`
+      ignore: [ 'source-map-support' ] // Optional required - do not hoist to top-level.
+    }),
+    copyTypeScriptFiles(), // Copy files needed by TypeScript compiler
+  ],
+  // List Node.js modules to avoid warnings about unresolved modules.
+  external: [
+    'buffer',
+    'crypto',
+    'fs',
+    'os',
+    'path',
+    'readline',
+  ],
+}
diff --git a/javascript/extractor/lib/typescript/src/ast_extractor.ts b/javascript/extractor/lib/typescript/src/ast_extractor.ts
new file mode 100644
index 00000000000..e69714dd580
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/ast_extractor.ts
@@ -0,0 +1,329 @@
+import * as ts from "./typescript";
+import { Project } from "./common";
+
+/**
+ * Interface that exposes some internal properties we rely on, as well as
+ * some properties we add ourselves.
+ */
+export interface AugmentedSourceFile extends ts.SourceFile {
+    parseDiagnostics?: any[];
+    $tokens?: Token[];
+    $symbol?: number;
+}
+
+export interface AugmentedNode extends ts.Node {
+    $pos?: any;
+    $end?: any;
+    $declarationKind?: string;
+    $type?: number;
+    $symbol?: number;
+    $resolvedSignature?: number;
+    $overloadIndex?: number;
+}
+
+export interface AugmentedPos extends ts.LineAndCharacter {
+    $offset?: number;
+}
+
+export interface Token {
+    kind: ts.SyntaxKind;
+    tokenPos: AugmentedPos;
+    text: string;
+}
+
+function hasOwnProperty(o: object, p: string) {
+    return o && Object.prototype.hasOwnProperty.call(o, p);
+}
+
+// build our own copy of `ts.SyntaxKind` without `First*`/`Last*` markers
+let SyntaxKind: { [id: number]: string } = [];
+for (let p in ts.SyntaxKind) {
+    if (!hasOwnProperty(ts.SyntaxKind, p)) {
+        continue;
+    }
+    // skip numeric indices
+    if (+p === +p) {
+        continue;
+    }
+    // skip `First*`/`Last*`
+    if (p.substring(0, 5) === "First" || p.substring(0, 4) === "Last") {
+        continue;
+    }
+    SyntaxKind[ts.SyntaxKind[p] as any] = p;
+}
+
+let skipWhiteSpace = /(?:\s|\/\/.*|\/\*[^]*?\*\/)*/g;
+
+/**
+ * Invokes the given callback for every AST node in the given tree.
+ */
+function forEachNode(ast: ts.Node, callback: (node: ts.Node) => void) {
+    function visit(node: ts.Node) {
+        ts.forEachChild(node, visit);
+        callback(node);
+    }
+    visit(ast);
+}
+
+export function augmentAst(ast: AugmentedSourceFile, code: string, project: Project | null) {
+    /**
+     * Converts a numeric offset to a position object with line and column information.
+     */
+    function augmentPos(pos: number, shouldSkipWhitespace?: boolean): AugmentedPos {
+        // skip over leading spaces/comments
+        if (shouldSkipWhitespace) {
+            skipWhiteSpace.lastIndex = pos;
+            pos += skipWhiteSpace.exec(code)[0].length;
+        }
+        let posObject: AugmentedPos = ast.getLineAndCharacterOfPosition(pos);
+        posObject.$offset = pos;
+        return posObject;
+    }
+
+    // Find the position of all tokens where the scanner requires parse-tree information.
+    // At these offsets, a call to `scanner.reScanX` is required.
+    type RescanEvent = () => void;
+    let reScanEvents: RescanEvent[] = [];
+    let reScanEventPos: number[] = [];
+    let scanner = ts.createScanner(ts.ScriptTarget.ES2015, false, 1, code);
+    let reScanSlashToken = scanner.reScanSlashToken.bind(scanner);
+    let reScanTemplateToken = scanner.reScanTemplateToken.bind(scanner);
+    let reScanGreaterToken = scanner.reScanGreaterToken.bind(scanner);
+    if (!ast.parseDiagnostics || ast.parseDiagnostics.length === 0) {
+        forEachNode(ast, node => {
+            if (ts.isRegularExpressionLiteral(node)) {
+                reScanEventPos.push(node.getStart(ast, false));
+                reScanEvents.push(reScanSlashToken);
+            }
+            if (ts.isTemplateMiddle(node) || ts.isTemplateTail(node)) {
+                reScanEventPos.push(node.getStart(ast, false));
+                reScanEvents.push(reScanTemplateToken);
+            }
+            if (ts.isBinaryExpression(node)) {
+                let operator = node.operatorToken;
+                switch (operator.kind) {
+                    case ts.SyntaxKind.GreaterThanEqualsToken:
+                    case ts.SyntaxKind.GreaterThanGreaterThanEqualsToken:
+                    case ts.SyntaxKind.GreaterThanGreaterThanGreaterThanEqualsToken:
+                    case ts.SyntaxKind.GreaterThanGreaterThanGreaterThanToken:
+                    case ts.SyntaxKind.GreaterThanGreaterThanToken:
+                        reScanEventPos.push(operator.getStart(ast, false));
+                        reScanEvents.push(reScanGreaterToken);
+                        break;
+                }
+            }
+        });
+    }
+
+    reScanEventPos.push(Infinity);
+
+    // add tokens and comments to the AST
+    ast.$tokens = [];
+    let rescanEventIndex = 0;
+    let nextRescanPosition = reScanEventPos[0];
+    let tk;
+    do {
+        tk = scanner.scan();
+        if (scanner.getTokenPos() === nextRescanPosition) {
+            let callback = reScanEvents[rescanEventIndex];
+            callback();
+            ++rescanEventIndex;
+            nextRescanPosition = reScanEventPos[rescanEventIndex];
+        }
+        ast.$tokens.push({
+            kind: tk,
+            tokenPos: augmentPos(scanner.getTokenPos()),
+            text: scanner.getTokenText(),
+        });
+    } while (tk !== ts.SyntaxKind.EndOfFileToken);
+
+    if (ast.parseDiagnostics) {
+        ast.parseDiagnostics.forEach(d => {
+            delete d.file;
+            d.$pos = augmentPos(d.start);
+        });
+    }
+
+    let typeChecker = project && project.program.getTypeChecker();
+    let typeTable = project && project.typeTable;
+
+    // Associate a symbol with the AST node root, in case it is a module.
+    if (typeTable != null) {
+        let symbol = typeChecker.getSymbolAtLocation(ast);
+        if (symbol != null) {
+            ast.$symbol = typeTable.getSymbolId(symbol);
+        }
+    }
+
+    forEachNode(ast, (node: AugmentedNode) => {
+        // fill in line/column info
+        if ("pos" in node) {
+            node.$pos = augmentPos(node.pos, true);
+        }
+        if ("end" in node) {
+            node.$end = augmentPos(node.end);
+        }
+
+        if (ts.isVariableDeclarationList(node as any)) {
+            let tz = ts as any;
+            if (typeof tz.isLet === "function" && tz.isLet(node) || (node.flags & ts.NodeFlags.Let)) {
+                node.$declarationKind = "let";
+            } else if (typeof tz.isConst === "function" && tz.isConst(node) || (node.flags & ts.NodeFlags.Const)) {
+                node.$declarationKind = "const";
+            } else {
+                node.$declarationKind = "var";
+            }
+        }
+
+        if (typeChecker != null) {
+            if (isTypedNode(node)) {
+                let type = typeChecker.getTypeAtLocation(node);
+                if (type != null) {
+                    let id = typeTable.buildType(type);
+                    if (id != null) {
+                        node.$type = id;
+                    }
+                }
+                // Extract the target call signature of a function call.
+                // In case the callee is overloaded or generic, this is not something we can
+                // derive from the callee type in QL.
+                if (ts.isCallOrNewExpression(node)) {
+                    let kind = ts.isCallExpression(node) ? ts.SignatureKind.Call : ts.SignatureKind.Construct;
+                    let resolvedSignature = typeChecker.getResolvedSignature(node);
+                    if (resolvedSignature != null) {
+                        let resolvedId = typeTable.getSignatureId(kind, resolvedSignature);
+                        if (resolvedId != null) {
+                            (node as AugmentedNode).$resolvedSignature = resolvedId;
+                        }
+                        let declaration = resolvedSignature.declaration;
+                        if (declaration != null) {
+                            // Find the generic signature, i.e. without call-site type arguments substituted,
+                            // but with overloading resolved.
+                            let calleeType = typeChecker.getTypeAtLocation(node.expression);
+                            if (calleeType != null && declaration != null) {
+                                let calleeSignatures = typeChecker.getSignaturesOfType(calleeType, kind);
+                                for (let i = 0; i < calleeSignatures.length; ++i) {
+                                    if (calleeSignatures[i].declaration === declaration) {
+                                        (node as AugmentedNode).$overloadIndex = i;
+                                        break;
+                                    }
+                                }
+                            }
+                            // Extract the symbol so the declaration can be found from QL.
+                            let name = (declaration as any).name;
+                            let symbol = name && typeChecker.getSymbolAtLocation(name);
+                            if (symbol != null) {
+                                (node as AugmentedNode).$symbol = typeTable.getSymbolId(symbol);
+                            }
+                        }
+                    }
+                }
+            }
+            if (isNamedNodeWithSymbol(node)) {
+                let symbol = typeChecker.getSymbolAtLocation(node.name);
+                if (symbol != null) {
+                    node.$symbol = typeTable.getSymbolId(symbol);
+                }
+            }
+            if (ts.isTypeReferenceNode(node)) {
+                // For type references we inject a symbol on each part of the name.
+                // We traverse each node in the name here since we know these are part of
+                // a type annotation.  This means we don't have to do it for all identifiers
+                // and qualified names, which would extract more information than we need.
+                let namePart: (ts.EntityName & AugmentedNode) = node.typeName;
+                while (ts.isQualifiedName(namePart)) {
+                    let symbol = typeChecker.getSymbolAtLocation(namePart.right);
+                    if (symbol != null) {
+                        namePart.$symbol = typeTable.getSymbolId(symbol);
+                    }
+
+                    // Traverse into the prefix.
+                    namePart = namePart.left;
+                }
+                let symbol = typeChecker.getSymbolAtLocation(namePart);
+                if (symbol != null) {
+                    namePart.$symbol = typeTable.getSymbolId(symbol);
+                }
+            }
+        }
+    });
+}
+
+type NamedNodeWithSymbol = AugmentedNode & (ts.ClassDeclaration | ts.InterfaceDeclaration
+    | ts.TypeAliasDeclaration | ts.EnumDeclaration | ts.EnumMember | ts.ModuleDeclaration | ts.FunctionDeclaration
+    | ts.MethodDeclaration | ts.MethodSignature);
+
+/**
+ * True if the given AST node has a name, and should be associated with a symbol.
+ */
+function isNamedNodeWithSymbol(node: ts.Node): node is NamedNodeWithSymbol {
+    switch (node.kind) {
+        case ts.SyntaxKind.ClassDeclaration:
+        case ts.SyntaxKind.InterfaceDeclaration:
+        case ts.SyntaxKind.TypeAliasDeclaration:
+        case ts.SyntaxKind.EnumDeclaration:
+        case ts.SyntaxKind.EnumMember:
+        case ts.SyntaxKind.ModuleDeclaration:
+        case ts.SyntaxKind.FunctionDeclaration:
+        case ts.SyntaxKind.MethodDeclaration:
+        case ts.SyntaxKind.MethodSignature:
+            return true;
+    }
+    return false;
+}
+
+/**
+ * True if the given AST node has a type.
+ */
+function isTypedNode(node: ts.Node): boolean {
+    switch (node.kind) {
+      case ts.SyntaxKind.ArrayLiteralExpression:
+      case ts.SyntaxKind.ArrowFunction:
+      case ts.SyntaxKind.AsExpression:
+      case ts.SyntaxKind.AwaitExpression:
+      case ts.SyntaxKind.BinaryExpression:
+      case ts.SyntaxKind.CallExpression:
+      case ts.SyntaxKind.ClassExpression:
+      case ts.SyntaxKind.CommaListExpression:
+      case ts.SyntaxKind.ConditionalExpression:
+      case ts.SyntaxKind.DeleteExpression:
+      case ts.SyntaxKind.ElementAccessExpression:
+      case ts.SyntaxKind.ExpressionStatement:
+      case ts.SyntaxKind.ExpressionWithTypeArguments:
+      case ts.SyntaxKind.FalseKeyword:
+      case ts.SyntaxKind.FunctionDeclaration:
+      case ts.SyntaxKind.FunctionExpression:
+      case ts.SyntaxKind.Identifier:
+      case ts.SyntaxKind.JsxExpression:
+      case ts.SyntaxKind.LiteralType:
+      case ts.SyntaxKind.NewExpression:
+      case ts.SyntaxKind.NonNullExpression:
+      case ts.SyntaxKind.NoSubstitutionTemplateLiteral:
+      case ts.SyntaxKind.NumericLiteral:
+      case ts.SyntaxKind.ObjectKeyword:
+      case ts.SyntaxKind.ObjectLiteralExpression:
+      case ts.SyntaxKind.OmittedExpression:
+      case ts.SyntaxKind.ParenthesizedExpression:
+      case ts.SyntaxKind.PartiallyEmittedExpression:
+      case ts.SyntaxKind.PostfixUnaryExpression:
+      case ts.SyntaxKind.PrefixUnaryExpression:
+      case ts.SyntaxKind.PropertyAccessExpression:
+      case ts.SyntaxKind.RegularExpressionLiteral:
+      case ts.SyntaxKind.StringLiteral:
+      case ts.SyntaxKind.TaggedTemplateExpression:
+      case ts.SyntaxKind.TemplateExpression:
+      case ts.SyntaxKind.TemplateHead:
+      case ts.SyntaxKind.TemplateMiddle:
+      case ts.SyntaxKind.TemplateSpan:
+      case ts.SyntaxKind.TemplateTail:
+      case ts.SyntaxKind.TrueKeyword:
+      case ts.SyntaxKind.TypeAssertionExpression:
+      case ts.SyntaxKind.TypeLiteral:
+      case ts.SyntaxKind.TypeOfExpression:
+      case ts.SyntaxKind.VoidExpression:
+      case ts.SyntaxKind.YieldExpression:
+        return true;
+      default:
+        return ts.isTypeNode(node);
+    }
+}
diff --git a/javascript/extractor/lib/typescript/src/common.ts b/javascript/extractor/lib/typescript/src/common.ts
new file mode 100644
index 00000000000..bffe3f7e08a
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/common.ts
@@ -0,0 +1,28 @@
+import * as ts from "./typescript";
+import { TypeTable } from "./type_table";
+
+export class Project {
+  public program: ts.Program = null;
+
+  constructor(public tsConfig: string, public config: ts.ParsedCommandLine, public typeTable: TypeTable) {}
+
+  public unload(): void {
+    this.typeTable.releaseProgram();
+    this.program = null;
+  }
+
+  public load(): void {
+    this.program = ts.createProgram(this.config.fileNames, this.config.options);
+    this.typeTable.setProgram(this.program);
+  }
+
+  /**
+   * Discards the old compiler instance and starts a new one.
+   */
+  public reload(): void {
+    // Ensure all references to the old compiler instance
+    // are cleared before calling `createProgram`.
+    this.unload();
+    this.load();
+  }
+}
diff --git a/javascript/extractor/lib/typescript/src/main.ts b/javascript/extractor/lib/typescript/src/main.ts
new file mode 100644
index 00000000000..c9eaf632635
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/main.ts
@@ -0,0 +1,443 @@
+/**
+ * @fileoverview Wrapper for TypeScript parser, inspired by
+ *               [typescript-eslint-parser](https://github.com/eslint/typescript-eslint-parser).
+ *
+ * The wrapper can be invoked with a single argument, which is interpreted as a file name.
+ * The file is parsed and the AST dumped to stdout as described below.
+ *
+ * When run without arguments, the wrapper enters server mode, expecting JSON-encoded requests
+ * on `stdin`, one per line.
+ *
+ * Each request should have a `command` property, which should either be `parse` or `quit`.
+ *
+ * A `quit` request causes the wrapper to terminate.
+ *
+ * A `parse` request should have a `filename` property, which should be the path of a
+ * TypeScript file.
+ *
+ * In response to a `parse` request, the wrapper invokes the TypeScript parser to parse
+ * the given file, and dumps a JSON representation of the resulting AST to stdout,
+ * with the following adjustments:
+ *
+ *   - the `kind` and `operator` properties have symbolic string values instead of numeric
+ *     values (the latter change between versions of the TypeScript compiler, the former
+ *     don't);
+ *   - position information is given in terms of line/column pairs instead of offsets;
+ *   - declarations have a `declarationKind` property indicating whether they are `var`,
+ *     `let` or `const` declarations;
+ *   - `parent` pointers are omitted (since they cannot be serialised to JSON);
+ *   - tokens and comments are added to the AST root node in a `tokens` property.
+ */
+
+"use strict";
+
+import * as fs from "fs";
+import * as pathlib from "path";
+import * as readline from "readline";
+import * as ts from "./typescript";
+import * as ast_extractor from "./ast_extractor";
+
+import { Project } from "./common";
+import { TypeTable } from "./type_table";
+
+// Modify the TypeScript `System` object to ensure BOMs are being
+// stripped off.
+ts.sys.readFile = (path: string, encoding?: string) => {
+    return getSourceCode(path);
+};
+
+interface ParseCommand {
+    command: "parse";
+    filename: string;
+}
+interface OpenProjectCommand {
+    command: "open-project";
+    tsConfig: string;
+}
+interface CloseProjectCommand {
+    command: "close-project";
+    tsConfig: string;
+}
+interface GetTypeTableCommand {
+    command: "get-type-table";
+}
+interface ResetCommand {
+    command: "reset";
+}
+interface QuitCommand {
+    command: "quit";
+}
+type Command = ParseCommand | OpenProjectCommand | CloseProjectCommand
+    | GetTypeTableCommand | ResetCommand | QuitCommand;
+
+/** The state to be shared between commands. */
+class State {
+    public project: Project = null;
+    public typeTable = new TypeTable();
+}
+let state = new State();
+
+/**
+ * Debugging method for finding cycles in the TypeScript AST. Should not be used in production.
+ *
+ * If cycles are found, additional properties should be added to `isBlacklistedProperty`.
+ */
+// tslint:disable-next-line:no-unused-variable
+function checkCycle(root: any) {
+    let path: string[] = [];
+    function visit(obj: any): boolean {
+        if (obj == null || typeof obj !== "object") return false;
+        if (obj.$cycle_visiting) {
+            return true;
+        }
+        obj.$cycle_visiting = true;
+        for (let k in obj) {
+            if (!obj.hasOwnProperty(k)) continue;
+            if (isBlacklistedProperty(k)) continue;
+            if (k === "$cycle_visiting") continue;
+            let cycle = visit(obj[k]);
+            if (cycle) {
+                path.push(k);
+                return true;
+            }
+        }
+        obj.$cycle_visiting = undefined;
+        return false;
+    }
+    visit(root);
+    if (path.length > 0) {
+        path.reverse();
+        console.log(JSON.stringify({type: "error", message: "Cycle = " + path.join(".")}));
+    }
+}
+
+/**
+ * A property that should not be serialized as part of the AST, because they
+ * lead to cycles or are just not needed.
+ *
+ * Because of restrictions on `JSON.stringify`, these properties may also not
+ * be used as part of a command response.
+ */
+function isBlacklistedProperty(k: string) {
+    return k === "parent" || k === "pos" || k === "end"
+        || k === "symbol" || k === "localSymbol"
+        || k === "flowNode" || k === "returnFlowNode"
+        || k === "nextContainer" || k === "locals"
+        || k === "bindDiagnostics" || k === "bindSuggestionDiagnostics";
+}
+
+/**
+ * Converts (part of) an AST to a JSON string, ignoring parent pointers.
+ */
+function stringifyAST(obj: any) {
+    return JSON.stringify(obj, (k, v) => {
+        if (isBlacklistedProperty(k)) {
+            return undefined;
+        }
+        return v;
+    });
+}
+
+/**
+ * Reads the contents of a file as UTF8 and strips off a leading BOM.
+ *
+ * This must match how the source is read in the Java part of the extractor,
+ * as source offsets will not otherwise match.
+ */
+function getSourceCode(filename: string): string {
+    let code = fs.readFileSync(filename, "utf-8");
+
+    if (code.charCodeAt(0) === 0xfeff) {
+        code = code.substring(1);
+    }
+
+    return code;
+}
+
+function handleParseCommand(command: ParseCommand) {
+    let filename = String(command.filename);
+    let {ast, code} = getAstForFile(filename);
+
+    // Get the AST and augment it.
+    ast_extractor.augmentAst(ast, code, state.project);
+
+    console.log(stringifyAST(
+        { type: "ast", ast, nodeFlags: ts.NodeFlags, syntaxKinds: ts.SyntaxKind },
+    ));
+}
+
+/**
+ * Gets the AST and source code for the given file, either from
+ * an already-open project, or by parsing the file.
+ */
+function getAstForFile(filename: string): {ast: ts.SourceFile, code: string} {
+    if (state.project != null) {
+        let ast = state.project.program.getSourceFile(filename);
+        if (ast != null) {
+            return {ast, code: ast.text};
+        }
+    }
+    return parseSingleFile(filename);
+}
+
+function parseSingleFile(filename: string): {ast: ts.SourceFile, code: string} {
+    let code = getSourceCode(filename);
+
+    // create a compiler host that only allows access to `filename`
+    let compilerHost: ts.CompilerHost = {
+        fileExists() { return true; },
+        getCanonicalFileName() { return filename; },
+        getCurrentDirectory() { return ""; },
+        getDefaultLibFileName() { return "lib.d.ts"; },
+        getNewLine() { return "\n"; },
+        getSourceFile() {
+            return ts.createSourceFile(filename, code, ts.ScriptTarget.Latest, true);
+        },
+        readFile() { return null; },
+        useCaseSensitiveFileNames() { return true; },
+        writeFile() { return null; },
+        getDirectories() { return []; },
+    };
+
+    // parse `filename` with minimial checking
+    let compilerOptions: ts.CompilerOptions = {
+        experimentalDecorators: true,
+        experimentalAsyncFunctions: true,
+        jsx: ts.JsxEmit.Preserve,
+        noResolve: true,
+    };
+
+    let program = ts.createProgram([filename], compilerOptions, compilerHost);
+
+    let ast = program.getSourceFile(filename);
+
+    return {ast, code};
+}
+
+function handleOpenProjectCommand(command: OpenProjectCommand) {
+    let tsConfigFilename = String(command.tsConfig);
+    let tsConfigText = fs.readFileSync(tsConfigFilename, "utf8");
+    let tsConfig = ts.parseConfigFileTextToJson(tsConfigFilename, tsConfigText);
+    let basePath = pathlib.dirname(tsConfigFilename);
+
+    let parseConfigHost: ts.ParseConfigHost = {
+        useCaseSensitiveFileNames: true,
+        readDirectory: ts.sys.readDirectory,
+        fileExists: (path: string) => fs.existsSync(path),
+        readFile: getSourceCode,
+    };
+    let config = ts.parseJsonConfigFileContent(tsConfig, parseConfigHost, basePath);
+    let project = new Project(tsConfigFilename, config, state.typeTable);
+    project.load();
+
+    state.project = project;
+    let program = project.program;
+    let typeChecker = program.getTypeChecker();
+
+    // Associate external module names with the corresponding file symbols.
+    // We need these mappings to identify which module a given external type comes from.
+    // The TypeScript API lets us resolve a module name to a source file, but there is no
+    // inverse mapping, nor a way to enumerate all known module names. So we discover all
+    // modules on the type roots (usually "node_modules/@types" but this is configurable).
+    let typeRoots = ts.getEffectiveTypeRoots(config.options, {
+        directoryExists: (path) => fs.existsSync(path),
+        getCurrentDirectory: () => basePath,
+    });
+
+    /** Concatenates two imports paths. These always use `/` as path separator. */
+    function joinModulePath(prefix: string, suffix: string) {
+        if (prefix.length === 0) return suffix;
+        if (suffix.length === 0) return prefix;
+        return prefix + "/" + suffix;
+    }
+
+    /**
+     * Traverses a directory that is a type root or contained in a type root, and associates
+     * module names (i.e. import strings) with files in this directory.
+     *
+     * `importPrefix` denotes an import string that resolves to this directory,
+     * or an empty string if the file itself is a type root.
+     *
+     * The `filePath` is a system file path, possibly absolute, whereas `importPrefix`
+     * is generally short and system-independent, typically just the name of a module.
+     */
+    function traverseTypeRoot(filePath: string, importPrefix: string) {
+        for (let child of fs.readdirSync(filePath)) {
+            if (child[0] === ".") continue;
+            let childPath = pathlib.join(filePath, child);
+            if (fs.statSync(childPath).isDirectory()) {
+                traverseTypeRoot(childPath, joinModulePath(importPrefix, child));
+                continue;
+            }
+            let sourceFile = program.getSourceFile(childPath);
+            if (sourceFile == null) {
+                continue;
+            }
+            let symbol = typeChecker.getSymbolAtLocation(sourceFile);
+            if (symbol == null) continue; // Happens if the source file is not a module.
+
+            let canonicalSymbol = getEffectiveExportTarget(symbol); // Follow `export = X` declarations.
+            let symbolId = state.typeTable.getSymbolId(canonicalSymbol);
+
+            let importPath = (child === "index.d.ts")
+                ? importPrefix
+                : joinModulePath(importPrefix, pathlib.basename(child, ".d.ts"));
+
+            // Associate the module name with this symbol.
+            state.typeTable.addModuleMapping(symbolId, importPath);
+
+            // Associate global variable names with this module.
+            // For each `export as X` declaration, the global X refers to this module.
+            // Note: the `globalExports` map is stored on the original symbol, not the target of `export=`.
+            if (symbol.globalExports != null) {
+                symbol.globalExports.forEach((global: ts.Symbol) => {
+                  state.typeTable.addGlobalMapping(symbolId, global.name);
+                });
+            }
+        }
+    }
+    for (let typeRoot of typeRoots || []) {
+        traverseTypeRoot(typeRoot, "");
+    }
+
+    // Emit module name bindings for external module declarations, i.e: `declare module 'X' {..}`
+    // These can generally occur anywhere; they may or may not be on the type root path.
+    for (let sourceFile of program.getSourceFiles()) {
+        for (let stmt of sourceFile.statements) {
+            if (ts.isModuleDeclaration(stmt) && ts.isStringLiteral(stmt.name)) {
+                let symbol = (stmt as any).symbol;
+                if (symbol == null) continue;
+                symbol = getEffectiveExportTarget(symbol);
+                let symbolId = state.typeTable.getSymbolId(symbol);
+                let moduleName = stmt.name.text;
+                state.typeTable.addModuleMapping(symbolId, moduleName);
+            }
+        }
+    }
+
+    /**
+     * If `symbol` refers to a container with an `export = X` declaration, returns
+     * the target of `X`, otherwise returns `symbol`.
+     */
+    function getEffectiveExportTarget(symbol: ts.Symbol) {
+        if (symbol.exports != null && symbol.exports.has(ts.InternalSymbolName.ExportEquals)) {
+            let exportAlias = symbol.exports.get(ts.InternalSymbolName.ExportEquals);
+            return typeChecker.getAliasedSymbol(exportAlias);
+        }
+        return symbol;
+    }
+
+    console.log(JSON.stringify({
+        type: "project-opened",
+        files: program.getSourceFiles().map(sf => pathlib.resolve(sf.fileName)),
+    }));
+}
+
+function handleCloseProjectCommand(command: CloseProjectCommand) {
+    if (state.project == null) {
+        console.log(JSON.stringify({
+            type: "error",
+            message: "No project is open",
+        }));
+        return;
+    }
+    state.project.unload();
+    state.project = null;
+    console.log(JSON.stringify({type: "project-closed"}));
+}
+
+function handleGetTypeTableCommand(command: GetTypeTableCommand) {
+    console.log(JSON.stringify({
+        type: "type-table",
+        typeTable: state.typeTable.getTypeTableJson(),
+    }));
+}
+
+function handleResetCommand(command: ResetCommand) {
+    reset();
+    console.log(JSON.stringify({
+        type: "reset-done",
+    }));
+}
+
+function reset() {
+    state = new State();
+    state.typeTable.restrictedExpansion = getEnvironmentVariable("SEMMLE_TYPESCRIPT_NO_EXPANSION", Boolean, false);
+}
+
+function getEnvironmentVariable<T>(name: string, parse: (x: string) => T, defaultValue: T) {
+    let value = process.env[name];
+    return value != null ? parse(value) : defaultValue;
+}
+
+function runReadLineInterface() {
+    reset();
+    let reloadMemoryThresholdMb = getEnvironmentVariable("SEMMLE_TYPESCRIPT_MEMORY_THRESHOLD", Number, 1000);
+    let isAboveReloadThreshold = false;
+    let rl = readline.createInterface({ input: process.stdin, output: process.stdout });
+    rl.on("line", (line: string) => {
+        let req: Command = JSON.parse(line);
+        switch (req.command) {
+        case "parse":
+            handleParseCommand(req);
+            // If memory usage has moved above the threshold, reboot the TypeScript compiler instance.
+            let bytesUsed = process.memoryUsage().heapUsed;
+            let megabytesUsed = bytesUsed / 1000000;
+            if (!isAboveReloadThreshold && megabytesUsed > reloadMemoryThresholdMb && state.project != null) {
+                console.warn('Restarting TypeScript compiler due to memory usage');
+                state.project.reload();
+                isAboveReloadThreshold = true;
+            } else if (isAboveReloadThreshold && megabytesUsed < reloadMemoryThresholdMb) {
+                isAboveReloadThreshold = false;
+            }
+            break;
+        case "open-project":
+            handleOpenProjectCommand(req);
+            break;
+        case "close-project":
+            handleCloseProjectCommand(req);
+            break;
+        case "get-type-table":
+            handleGetTypeTableCommand(req);
+            break;
+        case "reset":
+            handleResetCommand(req);
+            break;
+        case "quit":
+            rl.close();
+            break;
+        default:
+            throw new Error("Unknown command " + (req as any).command + ".");
+        }
+    });
+}
+
+// Parse command-line arguments.
+if (process.argv.length > 2) {
+    let argument = process.argv[2];
+    if (argument === "--version") {
+        console.log("parser-wrapper with TypeScript " + ts.version);
+    } else if (pathlib.basename(argument) === "tsconfig.json") {
+        handleOpenProjectCommand({
+            command: "open-project",
+            tsConfig: argument,
+        });
+        for (let sf of state.project.program.getSourceFiles()) {
+            if (pathlib.basename(sf.fileName) === "lib.d.ts") continue;
+            handleParseCommand({
+                command: "parse",
+                filename: sf.fileName,
+            });
+        }
+    } else if (pathlib.extname(argument) === ".ts" || pathlib.extname(argument) === ".tsx") {
+        handleParseCommand({
+            command: "parse",
+            filename: argument,
+        });
+    } else {
+        console.error("Unrecognized file or flag: " + argument);
+    }
+    process.exit(0);
+} else {
+    runReadLineInterface();
+}
diff --git a/javascript/extractor/lib/typescript/src/type_table.ts b/javascript/extractor/lib/typescript/src/type_table.ts
new file mode 100644
index 00000000000..ed0418e41ad
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/type_table.ts
@@ -0,0 +1,1178 @@
+import * as ts from "./typescript";
+
+interface AugmentedSymbol extends ts.Symbol {
+  parent?: AugmentedSymbol;
+
+  /** Cache of our own symbol ID. */
+  $id?: number;
+}
+
+interface AugmentedType extends ts.Type {
+  /**
+   * An internal property for predefined types, such as "true", "false", and "object".
+   */
+  intrinsicName?: string;
+}
+
+function isTypeReference(type: ts.Type): type is ts.TypeReference {
+  return (type.flags & ts.TypeFlags.Object) !== 0 &&
+      ((type as ts.ObjectType).objectFlags & ts.ObjectFlags.Reference) !== 0;
+}
+
+function isTypeVariable(type: ts.Type): type is ts.TypeVariable {
+  return (type.flags & ts.TypeFlags.TypeVariable) !== 0;
+}
+
+/**
+ * If `type` is a `this` type, returns the enclosing type.
+ * Otherwise returns `null`.
+ */
+function getEnclosingTypeOfThisType(type: ts.TypeVariable): ts.TypeReference {
+  // A 'this' type is an implicit type parameter to a class or interface.
+  // The type parameter itself doesn't have any good indicator of being a 'this' type,
+  // but we can get it like this:
+  // - the upper bound of the 'this' type parameter is always the enclosing type
+  // - the enclosing type knows its own 'this' type.
+  let bound = type.getConstraint();
+  if (bound == null) return null;
+  let target = (bound as ts.TypeReference).target; // undefined if not a TypeReference
+  if (target == null) return null;
+  return (target.thisType === type) ? target : null;
+}
+
+const typeDefinitionSymbols = ts.SymbolFlags.Class | ts.SymbolFlags.Interface |
+      ts.SymbolFlags.TypeAlias | ts.SymbolFlags.EnumMember | ts.SymbolFlags.Enum;
+
+/** Returns true if the given symbol refers to a type definition. */
+function isTypeDefinitionSymbol(symbol: ts.Symbol) {
+  return (symbol.flags & typeDefinitionSymbols) !== 0;
+}
+
+/** Gets the nearest enclosing block statement, function body, module body, or top-level. */
+function getEnclosingBlock(node: ts.Node) {
+  while (true) {
+    if (node == null) return null;
+    if (ts.isSourceFile(node) || ts.isFunctionLike(node) || ts.isBlock(node) || ts.isModuleBlock(node)) return node;
+    node = node.parent;
+  }
+}
+
+const typeofSymbols = ts.SymbolFlags.Class | ts.SymbolFlags.Namespace |
+  ts.SymbolFlags.Module | ts.SymbolFlags.Enum | ts.SymbolFlags.EnumMember;
+
+/**
+ * Returns true if the given symbol refers to a value that we consider
+ * a valid target for a `typeof` type.
+ */
+function isTypeofCandidateSymbol(symbol: ts.Symbol) {
+  return (symbol.flags & typeofSymbols) !== 0;
+}
+
+const signatureKinds = [ts.SignatureKind.Call, ts.SignatureKind.Construct];
+
+/**
+ * Encodes property lookup tuples `(baseType, name, property)` as three
+ * staggered arrays.
+ */
+interface PropertyLookupTable {
+  baseTypes: number[];
+  names: string[];
+  propertyTypes: number[];
+}
+
+/**
+ * Encodes type signature tuples `(baseType, kind, index, signature)` as four
+ * staggered arrays.
+ */
+interface SignatureTable {
+  baseTypes: number[];
+  kinds: ts.SignatureKind[];
+  indices: number[];
+  signatures: number[];
+}
+
+/**
+ * Enodes `(baseType, propertyType)` tuples as two staggered arrays.
+ *
+ * The index key type is not stored in the table - there are separate tables
+ * for number and string index signatures.
+ *
+ * For example, the `(Foo, T)` tuple would be extracted from this sample:
+ * ```
+ * interface Foo {
+ *   [x: string]: T;
+ * }
+ * ```
+ */
+interface IndexerTable {
+  baseTypes: number[];
+  propertyTypes: number[];
+}
+
+/**
+ * Encodes `(symbol, name)` pairs as two staggered arrays.
+ *
+ * In general, a table may associate multiple names with a given symbol.
+ */
+interface SymbolNameTable {
+  symbols: number[];
+  names: string[];
+}
+
+/**
+ * Encodes `(symbol, baseTypeSymbol)` pairs as two staggered arrays.
+ *
+ * Such a pair associates the canonical name of a type with the canonical name
+ * of one of its base types.
+ */
+interface BaseTypeTable {
+  symbols: number[];
+  baseTypeSymbols: number[];
+}
+
+/**
+ * Encodes `(symbol, selfType)` pairs as two staggered arrays.
+ *
+ * Such a pair associates the canonical name of a type with the self-type of
+ * that type definition. (e.g `Array` with `Array<T>`).
+ */
+interface SelfTypeTable {
+  symbols: number[];
+  selfTypes: number[];
+}
+
+/**
+ * Denotes whether a type is currently in the worklist ("pending") and whether
+ * it was discovered in shallow or full context.
+ *
+ * Types can be discovered in one of two different contexts:
+ * - Full context:
+ *   Any type that is the type of an AST node, or is reachable through members of
+ *   such a type, without going through an expansive type.
+ * - Shallow context:
+ *   Any type that is reachable through the members of an expansive type,
+ *   without following any type references after that.
+ *
+ * For example:
+ * ```
+ * interface Expansive<T> {
+ *   expand: Expansive<{x: T}>;
+ *   foo: { bar: T };
+ * }
+ * let instance: Expansive<number>;
+ * ```
+ * The type `Expansive<number>` is discovered in full context, but as it is expansive,
+ * its members are only discovered in shallow context.
+ *
+ * This means `Expansive<{x: number}>` becomes a stub type, a type that has an entity in
+ * the database, but appears to have no members.
+ *
+ * The type `{ bar: number }` is also discovered in shallow context, but because it is
+ * an "inline type" (not a reference) its members are extracted anyway (in shallow context),
+ * and will thus appear to have the `bar` property of type `number`.
+ */
+const enum TypeExtractionState {
+  /**
+   * The type is in the worklist and was discovered in shallow context.
+   */
+  PendingShallow,
+
+  /**
+   * The type has been extracted as a shallow type.
+   *
+   * It may later transition to `PendingFull` if it is found that full extraction is warranted.
+   */
+  DoneShallow,
+
+  /**
+   * The type is in the worklist and is pending full extraction.
+   */
+  PendingFull,
+
+  /**
+   * The type has been fully extracted.
+   */
+  DoneFull,
+}
+
+/**
+ * Generates canonical IDs and serialized representations of types.
+ */
+export class TypeTable {
+  /**
+   * Maps type strings to type IDs. The types must be inserted in order,
+   * so the `n`th type has ID `n`.
+   *
+   * A type string is a `;`-separated string consisting of:
+   * - a tag string such as `union` or `reference`,
+   * - optionally a symbol ID or kind-specific data (depends on the tag),
+   * - IDs of child types.
+   *
+   * Type strings serve a dual purpose:
+   * - Canonicalizing types. Two type objects with the same type string are considered identical.
+   * - Extracting types. The Java-part of the extractor parses type strings to extract data about the type.
+   */
+  private typeIds: Map<string, number> = new Map();
+  private typeToStringValues: string[] = [];
+  private typeChecker: ts.TypeChecker = null;
+
+  /**
+   * Needed for TypeChecker.getTypeOfSymbolAtLocation when we don't care about the location.
+   * There is no way to get the type of a symbol without providing a location, though.
+   */
+  private arbitraryAstNode: ts.Node = null;
+
+  /**
+   * Maps symbol strings to to symbol IDs. The symbols must be inserted in order,
+   * so the `n`th symbol has ID `n`.
+   *
+   * A symbol string is a `;`-separated string consisting of:
+   * - a tag string, `root`, `member`, or `other`,
+   * - an empty string or a `file:pos` string to distinguish this from symbols with other lexical roots,
+   * - the unqualified name of the symbol,
+   * - for non-root symbols, the ID of the parent symbol.
+   *
+   * Symbol strings serve the same dual purpose as type strings (see `typeIds`).
+   */
+  private symbolIds: Map<string, number> = new Map();
+
+  /**
+   * Maps file names to IDs unique for that file name.
+   *
+   * Used to generate short `file:pos` strings in symbol strings.
+   */
+  private fileIds: Map<String, number> = new Map();
+
+  /**
+   * Maps signature strings to signature IDs. The signatures must be inserted in order,
+   * so the `n`th signature has ID `n`.
+   *
+   * A signature string is a `;`-separated string consisting of:
+   * - a `ts.SignatureKind` value (i.e. the value 0 or 1)
+   * - number of type parameters
+   * - number of required parameters
+   * - ID of the return type
+   * - interleaved names and bounds (type IDs) of type parameters
+   * - interleaved names and type IDs of parameters
+   */
+  private signatureIds: Map<String, number> = new Map();
+
+  private signatureToStringValues: string[] = [];
+
+  private propertyLookups: PropertyLookupTable = {
+    baseTypes: [],
+    names: [],
+    propertyTypes: [],
+  };
+
+  private signatureMappings: SignatureTable = {
+    baseTypes: [],
+    kinds: [],
+    indices: [],
+    signatures: []
+  };
+
+  private numberIndexTypes: IndexerTable = {
+    baseTypes: [],
+    propertyTypes: [],
+  };
+
+  private stringIndexTypes: IndexerTable = {
+    baseTypes: [],
+    propertyTypes: [],
+  };
+
+  private buildTypeWorklist: [ts.Type, number][] = [];
+
+  private expansiveTypes: Map<number, boolean> = new Map();
+
+  private moduleMappings: SymbolNameTable = {
+    symbols: [],
+    names: [],
+  };
+  private globalMappings: SymbolNameTable = {
+    symbols: [],
+    names: [],
+  };
+
+  private baseTypes: BaseTypeTable = {
+    symbols: [],
+    baseTypeSymbols: [],
+  };
+
+  private selfTypes: SelfTypeTable = {
+    symbols: [],
+    selfTypes: [],
+  };
+
+  /**
+   * When true, newly discovered types should be extracted as "shallow" types in order
+   * to prevent expansive types from unfolding into infinitely many types.
+   *
+   * @see TypeExtractionState
+   */
+  private isInShallowTypeContext = false;
+
+  /**
+   * Maps a type ID to the extraction state of that type.
+   */
+  private typeExtractionState: TypeExtractionState[] = [];
+
+  /**
+   * Number of types we are currently in the process of flattening to a type string.
+   */
+  private typeRecursionDepth = 0;
+
+  /**
+   * If set to true, all types are considered expansive.
+   */
+  public restrictedExpansion = false;
+
+  /**
+   * Called when a new compiler instance has started.
+   */
+  public setProgram(program: ts.Program) {
+    this.typeChecker = program.getTypeChecker();
+    this.arbitraryAstNode = program.getSourceFiles()[0];
+  }
+
+  /**
+   * Called when the compiler instance should be relased from memory.
+   *
+   * This can happen because we are done with a project, or because the
+   * compiler instance needs to be rebooted.
+   */
+  public releaseProgram() {
+    this.typeChecker = null;
+    this.arbitraryAstNode = null;
+  }
+
+  /**
+   * Gets the canonical ID for the given type, generating a fresh ID if necessary.
+   */
+  public buildType(type: ts.Type): number | null {
+    this.isInShallowTypeContext = false;
+    let id = this.getId(type);
+    this.iterateBuildTypeWorklist();
+    if (id == null) return null;
+    return id;
+  }
+
+  /**
+   * Gets the canonical ID for the given type, generating a fresh ID if necessary.
+   *
+   * Returns `null` if we do not support extraction of this type.
+   */
+  public getId(type: ts.Type): number | null {
+    if (this.typeRecursionDepth > 100) {
+      // Ignore infinitely nested anonymous types, such as `{x: {x: {x: ... }}}`.
+      // Such a type can't be written directly with TypeScript syntax (as it would need to be named),
+      // but it can occur rarely as a result of type inference.
+      return null;
+    }
+    // Replace very long string literal types with `string`.
+    if ((type.flags & ts.TypeFlags.StringLiteral) && ((type as ts.LiteralType).value as string).length > 30) {
+      type = this.typeChecker.getBaseTypeOfLiteralType(type);
+    }
+    ++this.typeRecursionDepth;
+    let content = this.getTypeString(type);
+    --this.typeRecursionDepth;
+    if (content == null) return null; // Type not supported.
+    let id = this.typeIds.get(content);
+    if (id == null) {
+      let stringValue = this.stringifyType(type);
+      if (stringValue == null) {
+        return null; // Type not supported.
+      }
+      id = this.typeIds.size;
+      this.typeIds.set(content, id);
+      this.typeToStringValues.push(stringValue);
+      this.buildTypeWorklist.push([type, id]);
+      this.typeExtractionState.push(
+        this.isInShallowTypeContext ? TypeExtractionState.PendingShallow : TypeExtractionState.PendingFull);
+      // If the type is the self-type for a named type (not a generic instantiation of it),
+      // emit the self-type binding for that type.
+      if (content.startsWith("reference;") && !(isTypeReference(type) && type.target !== type)) {
+        this.selfTypes.symbols.push(this.getSymbolId(type.aliasSymbol || type.symbol));
+        this.selfTypes.selfTypes.push(id);
+      }
+    } else if (!this.isInShallowTypeContext) {
+      // If the type was previously marked as shallow, promote it to full,
+      // and put it back in the worklist if necessary.
+      let state = this.typeExtractionState[id];
+      if (state === TypeExtractionState.PendingShallow) {
+        this.typeExtractionState[id] = TypeExtractionState.PendingFull;
+      } else if (state === TypeExtractionState.DoneShallow) {
+        this.typeExtractionState[id] = TypeExtractionState.PendingFull;
+        this.buildTypeWorklist.push([type, id]);
+      }
+    }
+    return id;
+  }
+
+  private stringifyType(type: ts.Type): string {
+    let toStringValue: string;
+    // Some types can't be stringified. Just discard the type if we can't stringify it.
+    try {
+      toStringValue = this.typeChecker.typeToString(type);
+    } catch (e) {
+      console.warn("Recovered from a compiler crash while stringifying a type. Discarding the type.");
+      console.warn(e.stack);
+      return null;
+    }
+    if (toStringValue.length > 50) {
+      return toStringValue.substring(0, 47) + "...";
+    } else {
+      return toStringValue;
+    }
+  }
+
+  private stringifySignature(signature: ts.Signature, kind: ts.SignatureKind) {
+    let toStringValue: string;
+    // Some types can't be stringified. Just discard the type if we can't stringify it.
+    try {
+      toStringValue =
+          this.typeChecker.signatureToString(signature, signature.declaration, ts.TypeFormatFlags.None, kind);
+    } catch (e) {
+      console.warn("Recovered from a compiler crash while stringifying a signature. Discarding the signature.");
+      console.warn(e.stack);
+      return null;
+    }
+    if (toStringValue.length > 70) {
+      return toStringValue.substring(0, 69) + "...";
+    } else {
+      return toStringValue;
+    }
+  }
+
+  /**
+   * Gets a string representing the kind and contents of the given type.
+   */
+  private getTypeString(type: AugmentedType): string | null {
+    // Reference to a type alias.
+    if (type.aliasSymbol != null) {
+      let tag = "reference;" + this.getSymbolId(type.aliasSymbol);
+      return type.aliasTypeArguments == null
+          ? tag
+          : this.makeTypeStringVector(tag, type.aliasTypeArguments);
+    }
+    let flags = type.flags;
+    let objectFlags = (flags & ts.TypeFlags.Object) && (type as ts.ObjectType).objectFlags;
+    let symbol: AugmentedSymbol = type.symbol;
+    // Type that contains a reference to something.
+    if (symbol != null) {
+      // Possibly parameterized type.
+      if (isTypeReference(type)) {
+        let tag = "reference;" + this.getSymbolId(symbol);
+        return this.makeTypeStringVectorFromTypeReferenceArguments(tag, type);
+      }
+      // Reference to a type variable.
+      if (flags & ts.TypeFlags.TypeVariable) {
+        let enclosingType = getEnclosingTypeOfThisType(type);
+        if (enclosingType != null) {
+          return "this;" + this.getId(enclosingType);
+        } else if (symbol.parent == null) {
+          // The type variable is bound on a call signature. Only extract it by name.
+          return "lextypevar;" + symbol.name;
+        } else {
+          return "typevar;" + this.getSymbolId(symbol);
+        }
+      }
+      // Recognize types of form `typeof X` where `X` is a class, namespace, module, or enum.
+      // The TypeScript API has no explicit tag for `typeof` types. They can be recognized
+      // as anonymous object types that have a symbol (i.e. a "named anonymous type").
+      if ((objectFlags & ts.ObjectFlags.Anonymous) && isTypeofCandidateSymbol(symbol)) {
+        return "typeof;" + this.getSymbolId(symbol);
+      }
+      // Reference to a named type.
+      // Must occur after the `typeof` case to avoid matching `typeof C` as the type `C`.
+      if (isTypeDefinitionSymbol(symbol)) {
+        return "reference;" + this.getSymbolId(type.symbol);
+      }
+    }
+    if (flags === ts.TypeFlags.Any) {
+      return "any";
+    }
+    if (flags === ts.TypeFlags.String) {
+      return "string";
+    }
+    if (flags === ts.TypeFlags.Number) {
+      return "number";
+    }
+    if (flags === ts.TypeFlags.Void) {
+      return "void";
+    }
+    if (flags === ts.TypeFlags.Never) {
+      return "never";
+    }
+    if (flags & ts.TypeFlags.Null) {
+      return "null";
+    }
+    if (flags & ts.TypeFlags.Undefined) {
+      return "undefined";
+    }
+    if (flags === ts.TypeFlags.ESSymbol) {
+      return "plainsymbol";
+    }
+    if (flags & ts.TypeFlags.Unknown) {
+      return "unknown";
+    }
+    if (flags === ts.TypeFlags.UniqueESSymbol) {
+      return "uniquesymbol;" + this.getSymbolId((type as ts.UniqueESSymbolType).symbol);
+    }
+    if (flags === ts.TypeFlags.NonPrimitive && type.intrinsicName === "object") {
+      return "objectkeyword";
+    }
+    // Note that TypeScript represents the `boolean` type as `true|false`.
+    if (flags === ts.TypeFlags.BooleanLiteral) {
+      // There is no public API to distinguish true and false.
+      // We rely on the internal property `intrinsicName`, which
+      // should be either "true" or "false" here.
+      return type.intrinsicName;
+    }
+    if (flags & ts.TypeFlags.NumberLiteral) {
+      return "numlit;" + (type as ts.LiteralType).value;
+    }
+    if (flags & ts.TypeFlags.StringLiteral) {
+      return "strlit;" + (type as ts.LiteralType).value;
+    }
+    if (flags & ts.TypeFlags.Union) {
+      let unionType = type as ts.UnionType;
+      if (unionType.types.length === 0) {
+        // We ignore malformed types like unions and intersections without any operands.
+        // These trigger an assertion failure in `typeToString` - presumably because they
+        // cannot be written using TypeScript syntax - so we ignore them entirely.
+        return null;
+      }
+      return this.makeTypeStringVector("union", unionType.types);
+    }
+    if (flags & ts.TypeFlags.Intersection) {
+      let intersectionType = type as ts.IntersectionType;
+      if (intersectionType.types.length === 0) {
+        return null; // Ignore malformed type.
+      }
+      return this.makeTypeStringVector("intersection", intersectionType.types);
+    }
+    if (isTypeReference(type) && (type.target.objectFlags & ts.ObjectFlags.Tuple)) {
+      // Encode the minimum length and presence of rest element in the first two parts of the type string.
+      // Handle the absence of `minLength` and `hasRestElement` to be compatible with pre-3.0 compiler versions.
+      let tupleReference = type as ts.TupleTypeReference;
+      let tupleType = tupleReference.target;
+      let minLength = tupleType.minLength != null
+          ? tupleType.minLength
+          : tupleReference.typeArguments.length;
+      let hasRestElement = tupleType.hasRestElement ? 't' : 'f';
+      let prefix = `tuple;${minLength};${hasRestElement}`;
+      return this.makeTypeStringVectorFromTypeReferenceArguments(prefix, type);
+    }
+    if (objectFlags & ts.ObjectFlags.Anonymous) {
+      return this.makeStructuralTypeVector("object;", type as ts.ObjectType);
+    }
+    return null;
+  }
+
+  /**
+   * Gets the canonical ID for the given symbol.
+   *
+   * Note that this may be called with symbols from different compiler instantiations,
+   * and it should return the same ID for symbols that logically refer to the same thing.
+   */
+  public getSymbolId(symbol: AugmentedSymbol): number {
+    if (symbol.flags & ts.SymbolFlags.Alias) {
+      symbol = this.typeChecker.getAliasedSymbol(symbol);
+    }
+    // We cache the symbol ID to avoid rebuilding long symbol strings.
+    let id = symbol.$id;
+    if (id != null) return id;
+    let content = this.getSymbolString(symbol);
+    id = this.symbolIds.get(content);
+    if (id != null) {
+      // The ID was determined in a previous compiler instantiation.
+      return symbol.$id = id;
+    }
+    if (id == null) {
+      id = this.symbolIds.size;
+      this.symbolIds.set(content, id);
+      symbol.$id = id;
+
+      // Associate names with global symbols.
+      if (this.isGlobalSymbol(symbol)) {
+        this.addGlobalMapping(id, symbol.name);
+      }
+
+      // Associate type names with their base type names.
+      this.extractSymbolBaseTypes(symbol, id);
+    }
+    return id;
+  }
+
+  /** Returns true if the given symbol represents a name in the global scope. */
+  private isGlobalSymbol(symbol: AugmentedSymbol): boolean {
+    let parent = symbol.parent;
+    if (parent != null) {
+      if (parent.escapedName === ts.InternalSymbolName.Global) {
+        return true; // Symbol declared in a global augmentation block.
+      }
+      return false; // Symbol is not a root.
+    }
+    if (symbol.declarations == null || symbol.declarations.length === 0) return false;
+    let declaration = symbol.declarations[0];
+    let block = getEnclosingBlock(declaration);
+    if (ts.isSourceFile(block) && !this.isModuleSourceFile(block)) {
+      return true; // Symbol is declared at the top-level of a non-module file.
+    }
+    return false;
+  }
+
+  /** Returns true if the given source file defines a module. */
+  private isModuleSourceFile(file: ts.SourceFile) {
+    // This is not directly exposed, but a reliable indicator seems to be whether
+    // the file has a symbol.
+    return this.typeChecker.getSymbolAtLocation(file) != null;
+  }
+
+  /**
+   * Gets a unique string for the given symbol.
+   */
+  private getSymbolString(symbol: AugmentedSymbol): string {
+    let parent = symbol.parent;
+    if (parent == null || parent.escapedName === ts.InternalSymbolName.Global) {
+      return "root;" + this.getSymbolDeclarationString(symbol) + ";" + symbol.name;
+    } else if (parent.exports != null && parent.exports.get(symbol.escapedName) === symbol) {
+      return "member;;" + symbol.name + ";" + this.getSymbolId(parent);
+    } else {
+      return "other;" + this.getSymbolDeclarationString(symbol) + ";" + symbol.name + ";" + this.getSymbolId(parent);
+    }
+  }
+
+  /**
+   * Gets a string that distinguishes the given symbol from symbols with different
+   * lexical roots, or an empty string if the symbol is not a lexical root.
+   */
+  private getSymbolDeclarationString(symbol: AugmentedSymbol): string {
+    if (symbol.declarations == null || symbol.declarations.length === 0) {
+      return "";
+    }
+    let decl = symbol.declarations[0];
+    if (ts.isSourceFile(decl)) return "";
+    return this.getFileId(decl.getSourceFile().fileName) + ":" + decl.pos;
+  }
+
+  /**
+   * Gets a number unique for the given filename.
+   */
+  private getFileId(fileName: string): number {
+    let id = this.fileIds.get(fileName);
+    if (id == null) {
+      id = this.fileIds.size;
+      this.fileIds.set(fileName, id);
+    }
+    return id;
+  }
+
+  /**
+   * Like `makeTypeStringVector` using the type arguments in the given type reference.
+   */
+  private makeTypeStringVectorFromTypeReferenceArguments(tag: string, type: ts.TypeReference) {
+    // There can be an extra type argument at the end, denoting an explicit 'this' type argument.
+    // We discard the extra argument in our model.
+    let target = type.target;
+    if (type.typeArguments == null) return tag;
+    if (target.typeParameters != null) {
+      return this.makeTypeStringVector(tag, type.typeArguments, target.typeParameters.length);
+    } else {
+      return this.makeTypeStringVector(tag, type.typeArguments);
+    }
+  }
+
+  /**
+   * Returns the given string with the IDs of the given types appended,
+   * each separated by `;`.
+   */
+  private makeTypeStringVector(tag: string, types: ReadonlyArray<ts.Type>, length = types.length): string | null {
+    let hash = tag;
+    for (let i = 0; i < length; ++i) {
+      let id = this.getId(types[i]);
+      if (id == null) return null;
+      hash += ";" + id;
+    }
+    return hash;
+  }
+
+  /**
+   * Returns a type string consisting of all the members of the given type.
+   *
+   * This must only be called for anonymous object types, as the type string for this
+   * type could otherwise depend on itself recursively.
+   */
+  private makeStructuralTypeVector(tag: string, type: ts.ObjectType): string | null {
+    let hash = tag;
+    for (let property of type.getProperties()) {
+      let propertyType = this.typeChecker.getTypeOfSymbolAtLocation(property, this.arbitraryAstNode);
+      if (propertyType == null) return null;
+      let propertyTypeId = this.getId(propertyType);
+      if (propertyTypeId == null) return null;
+      hash += ";p" + this.getSymbolId(property) + ';' + propertyTypeId;
+    }
+    for (let kind of signatureKinds) {
+      for (let signature of this.typeChecker.getSignaturesOfType(type, kind)) {
+        let id = this.getSignatureId(kind, signature);
+        if (id == null) return null;
+        hash += ";c" + id;
+      }
+    }
+    let indexType = type.getStringIndexType();
+    if (indexType != null) {
+      let indexTypeId = this.getId(indexType);
+      if (indexTypeId == null) return null;
+      hash += ";s" + indexTypeId;
+    }
+    indexType = type.getNumberIndexType();
+    if (indexType != null) {
+      let indexTypeId = this.getId(indexType);
+      if (indexTypeId == null) return null;
+      hash += ";i" + indexTypeId;
+    }
+    return hash;
+  }
+
+  public addModuleMapping(symbolId: number, moduleName: string) {
+    this.moduleMappings.symbols.push(symbolId);
+    this.moduleMappings.names.push(moduleName);
+  }
+
+  public addGlobalMapping(symbolId: number, globalName: string) {
+    this.globalMappings.symbols.push(symbolId);
+    this.globalMappings.names.push(globalName);
+  }
+
+  public getTypeTableJson(): object {
+    return {
+      typeStrings: Array.from(this.typeIds.keys()),
+      typeToStringValues: this.typeToStringValues,
+      propertyLookups: this.propertyLookups,
+      symbolStrings: Array.from(this.symbolIds.keys()),
+      moduleMappings: this.moduleMappings,
+      globalMappings: this.globalMappings,
+      signatureStrings: Array.from(this.signatureIds.keys()),
+      signatureMappings: this.signatureMappings,
+      signatureToStringValues: this.signatureToStringValues,
+      numberIndexTypes: this.numberIndexTypes,
+      stringIndexTypes: this.stringIndexTypes,
+      baseTypes: this.baseTypes,
+      selfTypes: this.selfTypes,
+    };
+  }
+
+  /**
+   * Extracts the deep property and signature graph of recently discovered types.
+   *
+   * Types are added to the worklist when they are first assigned an ID,
+   * which happen transparently during property extraction and expansiveness checks.
+   */
+  private iterateBuildTypeWorklist() {
+    let worklist = this.buildTypeWorklist;
+    let typeExtractionState = this.typeExtractionState;
+    while (worklist.length > 0) {
+      let [type, id] = worklist.pop();
+      let isShallowContext = typeExtractionState[id] === TypeExtractionState.PendingShallow;
+      if (isShallowContext && isTypeReference(type)) {
+        typeExtractionState[id] = TypeExtractionState.DoneShallow;
+      } else {
+        typeExtractionState[id] = TypeExtractionState.DoneFull;
+        this.isInShallowTypeContext = isShallowContext || this.isExpansiveTypeReference(type);
+        this.extractProperties(type, id);
+        this.extractSignatures(type, id);
+        this.extractIndexers(type, id);
+      }
+    }
+    this.isInShallowTypeContext = false;
+  }
+
+  private extractProperties(type: ts.Type, id: number) {
+    for (let symbol of type.getProperties()) {
+      let propertyType = this.typeChecker.getTypeOfSymbolAtLocation(symbol, this.arbitraryAstNode);
+      if (propertyType == null) continue;
+      let propertyTypeId = this.getId(propertyType);
+      if (propertyTypeId == null) continue;
+      this.propertyLookups.baseTypes.push(id);
+      this.propertyLookups.names.push(symbol.name);
+      this.propertyLookups.propertyTypes.push(propertyTypeId);
+    }
+  }
+
+  /**
+   * Returns a unique ID for the given call/construct signature.
+   */
+  public getSignatureId(kind: ts.SignatureKind, signature: ts.Signature): number {
+    let content = this.getSignatureString(kind, signature);
+    if (content == null) {
+      return null;
+    }
+    let id = this.signatureIds.get(content);
+    if (id == null) {
+      let stringValue = this.stringifySignature(signature, kind);
+      if (stringValue == null) {
+        return null; // Not supported.
+      }
+      id = this.signatureIds.size;
+      this.signatureIds.set(content, id);
+      this.signatureToStringValues.push(stringValue);
+    }
+    return id;
+  }
+
+  /**
+   * Returns a unique string for the given call/constructor signature.
+   */
+  private getSignatureString(kind: ts.SignatureKind, signature: ts.Signature): string {
+    let parameters = signature.getParameters();
+    let numberOfTypeParameters = signature.typeParameters == null
+        ? 0
+        : signature.typeParameters.length;
+    // Count the number of required parameters.
+    let requiredParameters = parameters.length;
+    for (let i = 0; i < parameters.length; ++i) {
+      if (parameters[i].flags & ts.SymbolFlags.Optional) {
+        requiredParameters = i;
+        break;
+      }
+    }
+    let returnTypeId = this.getId(signature.getReturnType());
+    if (returnTypeId == null) {
+      return null;
+    }
+    let tag = `${kind};${numberOfTypeParameters};${requiredParameters};${returnTypeId}`;
+    for (let typeParameter of signature.typeParameters || []) {
+      tag += ";" + typeParameter.symbol.name;
+      let constraint = typeParameter.getConstraint();
+      let constraintId: number;
+      if (constraint == null || (constraintId = this.getId(constraint)) == null) {
+        tag += ";";
+      } else {
+        tag += ";" + constraintId;
+      }
+    }
+    for (let parameter of parameters) {
+      let parameterType = this.typeChecker.getTypeOfSymbolAtLocation(parameter, this.arbitraryAstNode);
+      if (parameterType == null) {
+        return null;
+      }
+      let parameterTypeId = this.getId(parameterType);
+      if (parameterTypeId == null) {
+        return null;
+      }
+      tag += ';' + parameter.name + ';' + parameterTypeId;
+    }
+    return tag;
+  }
+
+  private extractSignatures(type: ts.Type, id: number) {
+    this.extractSignatureList(type, id, ts.SignatureKind.Call, type.getCallSignatures());
+    this.extractSignatureList(type, id, ts.SignatureKind.Construct, type.getConstructSignatures());
+  }
+
+  private extractSignatureList(type: ts.Type, id: number, kind: ts.SignatureKind, list: ReadonlyArray<ts.Signature>) {
+    let index = -1;
+    for (let signature of list) {
+      ++index;
+      let signatureId = this.getSignatureId(kind, signature);
+      if (signatureId == null) continue;
+      this.signatureMappings.baseTypes.push(id);
+      this.signatureMappings.kinds.push(kind);
+      this.signatureMappings.indices.push(index);
+      this.signatureMappings.signatures.push(signatureId);
+    }
+  }
+
+  private extractIndexers(type: ts.Type, id: number) {
+    this.extractIndexer(id, type.getStringIndexType(), this.stringIndexTypes);
+    this.extractIndexer(id, type.getNumberIndexType(), this.numberIndexTypes);
+  }
+
+  private extractIndexer(baseType: number, indexType: ts.Type, table: IndexerTable) {
+    if (indexType == null) return;
+    let indexTypeId = this.getId(indexType);
+    if (indexTypeId == null) return;
+    table.baseTypes.push(baseType);
+    table.propertyTypes.push(indexTypeId);
+  }
+
+  /**
+   * If the given symbol represents a type name, extracts its base type names.
+   *
+   * Base types are only extracted at the level of names, since the type arguments
+   * of a base type are not generally made available by the TypeScript API.
+   *
+   * For example, given these interfaces:
+   * ```
+   * interface Base<T> { x: T }
+   * interface Sub<S> extends Base<S[]> {}
+   * ```
+   * a true base type of `Sub<number>` would be `Base<number[]>`, but all we can
+   * get from the compiler is just `Base<S[]>` with no indication of what `S` should be.
+   */
+  private extractSymbolBaseTypes(symbol: ts.Symbol, symbolId: number) {
+    for (let decl of symbol.declarations || []) {
+      if (ts.isClassLike(decl) || ts.isInterfaceDeclaration(decl)) {
+        for (let heritage of decl.heritageClauses || []) {
+          for (let typeExpr of heritage.types) {
+            let superType = this.typeChecker.getTypeFromTypeNode(typeExpr);
+            if (superType == null) continue;
+            let baseTypeSymbol = superType.symbol;
+            if (baseTypeSymbol == null) continue;
+            this.baseTypes.symbols.push(symbolId);
+            this.baseTypes.baseTypeSymbols.push(this.getSymbolId(baseTypeSymbol));
+          }
+        }
+      }
+    }
+  }
+
+  /**
+   * If `type` is a generic instantiation of a type, returns the
+   * generic self-type for that type, otherwise `null`.
+   *
+   * For example, `Promise<string>` maps to `Promise<T>`, where
+   * `T` is the type parameter declared on the `Promise` interface.
+   */
+  private getSelfType(type: ts.Type): ts.TypeReference {
+    if (isTypeReference(type) && type.typeArguments != null && type.typeArguments.length > 0) {
+      return type.target;
+    }
+    return null;
+  }
+
+  /**
+   * True if the given type is a reference to a type that is part of an expansive cycle, which
+   * we simply call "expansive types".
+   *
+   * Non-expansive types may still lead into an expansive type, as long as it's not part of
+   * the cycle.
+   *
+   * It is guaranteed that any sequence of property reads on a type will loop back to a previously
+   * seen type or a reach a type that is marked as expansive.  That is, this is sufficient to
+   * guarantee termination of recursive property traversal.
+   */
+  private isExpansiveTypeReference(type: ts.Type): boolean {
+    if (this.restrictedExpansion) {
+      return true;
+    }
+    let selfType = this.getSelfType(type);
+    if (selfType != null) {
+      this.checkExpansiveness(selfType);
+      let id = this.getId(selfType);
+      return this.expansiveTypes.get(id);
+    }
+    return false;
+  }
+
+  /**
+   * Checks if the given self-type is an expansive type. The result is stored in `expansiveTypes`.
+   *
+   * This follows a variant of Tarjan's SCC algorithm on a graph derived from the properties of types.
+   *
+   * The vertices of the graph are generic "self types", that is, types like `Foo<T>` but not `Foo<number>`.
+   * Types without type arguments are not vertices either, as such types can't be part of an expansive cycle.
+   *
+   * A property S.x with type T implies an edge from S to the self-type of every type referenced in T, whose
+   * type arguments contain a type parameter of S.  Moreover, if such a reference contains a deeply nested
+   * occurence of a type parameter, e.g. `Foo<Bar<T>>` it is classified as an "expanding" edge
+   *
+   * For example, this interface:
+   *
+   *     interface Foo<T> {
+   *       x: Bar<Baz<T>>
+   *     }
+   *
+   * implies the following edges:
+   *
+   *   Foo ==> Bar    (expanding edge)
+   *   Foo --> Baz    (neutral edge)
+   *
+   * If an SCC contains an expanding edge, all its members are classified as expansive types.
+   *
+   * Suppose we extend the example with the interfaces:
+   *
+   *     interface Bar<T> {
+   *       x: T;
+   *     }
+   *
+   *     interface Baz<T> {
+   *       x: Foo<T[]>
+   *     }
+   *
+   * The `Bar` interface implies no edges and the `Baz` interface implies the edge:
+   *
+   *   Baz ==> Foo    (expanding edge)
+   *
+   * This creates an expanding cycle, Foo --> Baz ==> Foo, so Foo and Baz are considered
+   * expansive, whereas Bar is not.
+   */
+  private checkExpansiveness(type: ts.TypeReference) {
+    // `index`, `lowlink` and `stack` are from Tarjan's algorithm.
+    // Note that the type ID cannot be used as `index` because the index must be
+    // increasing with the order in which nodes are discovered in the traversal.
+    let indexTable = new Map<number, number>();
+    let lowlinkTable = new Map<number, number>();
+    let indexCounter = 0;
+    let stack: number[] = []; // IDs of types on the stack.
+
+    // The expansion depth is the number of expanding edges that were used to
+    // reach the given node when it was first discovered.  It is used to detect
+    // if the SCC contains an expanding edge.
+    // We also abuse this to track whether a node is currently on the stack;
+    // as long as the value is non-null, the node is on the stack.
+    let expansionDepthTable = new Map<number, number>();
+
+    let typeTable = this;
+
+    search(type, 0);
+
+    function search(type: ts.TypeReference, expansionDepth: number): number | null {
+      let id = typeTable.getId(type);
+      if (id == null) return null;
+
+      let index = indexTable.get(id);
+      if (index != null) { // Seen this node before?
+        let initialExpansionDepth = expansionDepthTable.get(id);
+        if (initialExpansionDepth == null) {
+          return null; // Not on the stack anymore.  Its SCC is already complete.
+        }
+        if (expansionDepth > initialExpansionDepth) {
+          // The type has reached itself using an expansive edge.
+          // Mark is at expansive.  The rest of the SCC will be marked when the SCC is complete.
+          typeTable.expansiveTypes.set(id, true);
+        }
+        return index;
+      }
+
+      let previousResult = typeTable.expansiveTypes.get(id);
+      if (previousResult != null) {
+        // This node was classified by a previous call to checkExpansiveness.
+        return null;
+      }
+
+      index = ++indexCounter;
+      indexTable.set(id, index);
+      lowlinkTable.set(id, index);
+      expansionDepthTable.set(id, expansionDepth);
+      let indexOnStack = stack.length;
+      stack.push(id);
+
+      for (let symbol of type.getProperties()) {
+        let propertyType: ts.Type = typeTable.typeChecker.getTypeOfSymbolAtLocation(symbol, typeTable.arbitraryAstNode);
+        if (propertyType == null) continue;
+        traverseType(propertyType);
+      }
+
+      if (lowlinkTable.get(id) === index) {
+        // We have finished an SCC.
+        // If any type was marked as expansive, propagate this to the entire SCC.
+        let isExpansive = false;
+        for (let i = indexOnStack; i < stack.length; ++i) {
+          let memberId = stack[i];
+          if (typeTable.expansiveTypes.get(memberId) === true) {
+            isExpansive = true;
+            break;
+          }
+        }
+        for (let i = indexOnStack; i < stack.length; ++i) {
+          let memberId = stack[i];
+          typeTable.expansiveTypes.set(memberId, isExpansive);
+          expansionDepthTable.set(memberId, null); // Mark as not on stack anymore.
+        }
+        stack.length = indexOnStack; // Pop all SCC nodes from stack.
+      }
+
+      return lowlinkTable.get(id);
+
+      /** Indicates if a type contains no type variables, is a type variable, or strictly contains type variables. */
+      const enum TypeVarDepth {
+        noTypeVar = 0,
+        isTypeVar = 1,
+        containsTypeVar = 2,
+      }
+
+      function traverseType(type: ts.Type): TypeVarDepth {
+        if (isTypeVariable(type)) return TypeVarDepth.isTypeVar;
+        let depth = TypeVarDepth.noTypeVar;
+        typeTable.forEachChildType(type, child => {
+          depth = Math.max(depth, traverseType(child));
+        });
+        if (depth === TypeVarDepth.noTypeVar) {
+          // No need to recurse into types that do not reference a type variable.
+          return TypeVarDepth.noTypeVar;
+        }
+        let selfType = typeTable.getSelfType(type);
+        if (selfType != null) {
+          // A non-expanding reference such as `Foo<T>` should preserve expansion depth,
+          // whereas an expanding reference `Foo<T[]>` should increment it.
+          visitEdge(selfType, (depth === TypeVarDepth.isTypeVar) ? 0 : 1);
+        }
+        return TypeVarDepth.containsTypeVar;
+      }
+
+      function visitEdge(successor: ts.TypeReference, weight: number) {
+        let result = search(successor, expansionDepth + weight);
+        if (result == null) return;
+        lowlinkTable.set(id, Math.min(lowlinkTable.get(id), result));
+      }
+    }
+  }
+
+  private forEachChildType(type: ts.Type, callback: (type: ts.Type) => void): void {
+    // Note: we deliberately do not traverse type aliases here, but the underlying type.
+    if (isTypeReference(type)) {
+      // Note that this case also handles tuple types, since a tuple type is represented as
+      // a reference to a synthetic generic interface.
+      if (type.typeArguments != null) {
+        type.typeArguments.forEach(callback);
+      }
+    } else if (type.flags & ts.TypeFlags.UnionOrIntersection) {
+      (type as ts.UnionOrIntersectionType).types.forEach(callback);
+    } else if (type.flags & ts.TypeFlags.Object) {
+      let objectType = type as ts.ObjectType;
+      let objectFlags = objectType.objectFlags;
+      if (objectFlags & ts.ObjectFlags.Anonymous) {
+        // Anonymous interface type like `{ x: number }`.
+        for (let symbol of type.getProperties()) {
+          let propertyType = this.typeChecker.getTypeOfSymbolAtLocation(symbol, this.arbitraryAstNode);
+          if (propertyType == null) continue;
+          callback(propertyType);
+        }
+        for (let signature of type.getCallSignatures()) {
+          this.forEachChildTypeOfSignature(signature, callback);
+        }
+        for (let signature of type.getConstructSignatures()) {
+          this.forEachChildTypeOfSignature(signature, callback);
+        }
+        let stringIndexType = type.getStringIndexType();
+        if (stringIndexType != null) {
+          callback(stringIndexType);
+        }
+        let numberIndexType = type.getNumberIndexType();
+        if (numberIndexType != null) {
+          callback(numberIndexType);
+        }
+      }
+    }
+  }
+
+  private forEachChildTypeOfSignature(signature: ts.Signature, callback: (type: ts.Type) => void): void {
+    callback(signature.getReturnType());
+    for (let parameter of signature.getParameters()) {
+      let paramType = this.typeChecker.getTypeOfSymbolAtLocation(parameter, this.arbitraryAstNode);
+      if (paramType == null) continue;
+      callback(paramType);
+    }
+    let typeParameters = signature.getTypeParameters();
+    if (typeParameters != null) {
+      for (let typeParameter of typeParameters) {
+        let constraint = typeParameter.getConstraint();
+        if (constraint == null) continue;
+        callback(constraint);
+      }
+    }
+  }
+}
diff --git a/javascript/extractor/lib/typescript/src/typescript.d.ts b/javascript/extractor/lib/typescript/src/typescript.d.ts
new file mode 100644
index 00000000000..769a318e724
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/typescript.d.ts
@@ -0,0 +1,2 @@
+import * as ts from "typescript";
+export = ts;
diff --git a/javascript/extractor/lib/typescript/src/typescript.js b/javascript/extractor/lib/typescript/src/typescript.js
new file mode 100644
index 00000000000..3c0bdc93b6a
--- /dev/null
+++ b/javascript/extractor/lib/typescript/src/typescript.js
@@ -0,0 +1,8 @@
+let overridePath = process.env['SEMMLE_TYPESCRIPT_HOME'];
+
+if (overridePath != null) {
+  module.exports = require(overridePath);
+} else {
+  // Unlike the above, this require() call will be rewritten by rollup.
+  module.exports = require('typescript');
+}
diff --git a/javascript/extractor/lib/typescript/tsconfig.json b/javascript/extractor/lib/typescript/tsconfig.json
new file mode 100644
index 00000000000..81038684f40
--- /dev/null
+++ b/javascript/extractor/lib/typescript/tsconfig.json
@@ -0,0 +1,16 @@
+{
+  "compilerOptions": {
+      "module": "commonjs",
+      "noImplicitAny": true,
+      "removeComments": true,
+      "sourceMap": false,
+      "baseUrl": "./",
+      "lib": ["es2016"],
+      "target": "es5",
+      "outDir": "build",
+      "allowJs": true,
+  },
+  "include": [
+    "src"
+  ]
+}
diff --git a/javascript/extractor/lib/typescript/tslint.json b/javascript/extractor/lib/typescript/tslint.json
new file mode 100644
index 00000000000..38e95b016bf
--- /dev/null
+++ b/javascript/extractor/lib/typescript/tslint.json
@@ -0,0 +1,64 @@
+{
+  "rules": {
+    "align": [true, "parameters", "arguments", "statements"],
+    "class-name": true,
+    "comment-format": [true, "check-space"],
+    "curly": false,
+    "eofline": true,
+    "forin": true,
+    "indent": [true, "spaces"],
+    "jsdoc-format": true,
+    "label-position": true,
+    "max-line-length": [true, 120],
+    "member-access": true,
+    "no-arg": true,
+    "no-construct": true,
+    "no-debugger": true,
+    "no-duplicate-variable": true,
+    "no-empty": true,
+    "no-eval": true,
+    "no-inferrable-types": true,
+    "no-internal-module": true,
+    "no-require-imports": false,
+    "no-shadowed-variable": false,
+    "no-string-literal": true,
+    "no-switch-case-fall-through": true,
+    "no-trailing-whitespace": true,
+    "no-unused-expression": true,
+    "no-unused-variable": [true,
+      "react"
+    ],
+    "no-use-before-declare": true,
+    "no-var-keyword": true,
+    "object-literal-sort-keys": false,
+    "one-line": [true,
+      "check-open-brace",
+      "check-catch",
+      "check-else",
+      "check-finally",
+      "check-whitespace"
+    ],
+    "quotemark": [false],
+    "radix": true,
+    "semicolon": [true, "always"],
+    "trailing-comma": [true, {
+      "singleline": "never"
+    }],
+    "triple-equals": [true, "allow-null-check"],
+    "typedef-whitespace": [true, {
+      "call-signature": "nospace",
+      "index-signature": "nospace",
+      "parameter": "nospace",
+      "property-declaration": "nospace",
+      "variable-declaration": "nospace"
+    }],
+    "variable-name": false,
+    "whitespace": [true,
+      "check-branch",
+      "check-decl",
+      "check-operator",
+      "check-separator",
+      "check-type"
+    ]
+  }
+}
diff --git a/javascript/extractor/lib/typescript/yarn.lock b/javascript/extractor/lib/typescript/yarn.lock
new file mode 100644
index 00000000000..53b3ab40ff3
--- /dev/null
+++ b/javascript/extractor/lib/typescript/yarn.lock
@@ -0,0 +1,518 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@types/estree@0.0.39":
+  version "0.0.39"
+  resolved "estree-0.0.39.tgz#e177e699ee1b8c22d23174caaa7422644389509f"
+
+"@types/node@*":
+  version "10.12.0"
+  resolved "node-10.12.0.tgz#ea6dcbddbc5b584c83f06c60e82736d8fbb0c235"
+
+"@types/node@^9.3.0":
+  version "9.3.0"
+  resolved "@types-node-9.3.0.tgz#3a129cda7c4e5df2409702626892cb4b96546dd5"
+
+ansi-regex@^2.0.0:
+  version "2.1.1"
+  resolved "ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
+
+ansi-styles@^2.2.1:
+  version "2.2.1"
+  resolved "ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
+
+ansi-styles@^3.1.0:
+  version "3.2.0"
+  resolved "ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
+  dependencies:
+    color-convert "^1.9.0"
+
+argparse@^1.0.7:
+  version "1.0.9"
+  resolved "argparse-1.0.9.tgz#73d83bc263f86e97f8cc4f6bae1b0e90a7d22c86"
+  dependencies:
+    sprintf-js "~1.0.2"
+
+arr-diff@^2.0.0:
+  version "2.0.0"
+  resolved "arr-diff-2.0.0.tgz#8f3b827f955a8bd669697e4a4256ac3ceae356cf"
+  dependencies:
+    arr-flatten "^1.0.1"
+
+arr-flatten@^1.0.1:
+  version "1.1.0"
+  resolved "arr-flatten-1.1.0.tgz#36048bbff4e7b47e136644316c99669ea5ae91f1"
+
+array-unique@^0.2.1:
+  version "0.2.1"
+  resolved "array-unique-0.2.1.tgz#a1d97ccafcbc2625cc70fadceb36a50c58b01a53"
+
+babel-code-frame@^6.22.0:
+  version "6.26.0"
+  resolved "babel-code-frame-6.26.0.tgz#63fd43f7dc1e3bb7ce35947db8fe369a3f58c74b"
+  dependencies:
+    chalk "^1.1.3"
+    esutils "^2.0.2"
+    js-tokens "^3.0.2"
+
+balanced-match@^1.0.0:
+  version "1.0.0"
+  resolved "balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
+
+brace-expansion@^1.1.7:
+  version "1.1.8"
+  resolved "brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
+  dependencies:
+    balanced-match "^1.0.0"
+    concat-map "0.0.1"
+
+braces@^1.8.2:
+  version "1.8.5"
+  resolved "ces-1.8.5.tgz#ba77962e12dff969d6b76711e914b737857bf6a7"
+  dependencies:
+    expand-range "^1.8.1"
+    preserve "^0.2.0"
+    repeat-element "^1.1.2"
+
+builtin-modules@^1.1.1:
+  version "1.1.1"
+  resolved "builtin-modules-1.1.1.tgz#270f076c5a72c02f5b65a47df94c5fe3a278892f"
+
+builtin-modules@^2.0.0:
+  version "2.0.0"
+  resolved "builtin-modules-2.0.0.tgz#60b7ef5ae6546bd7deefa74b08b62a43a232648e"
+
+chalk@^1.1.3:
+  version "1.1.3"
+  resolved "chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
+  dependencies:
+    ansi-styles "^2.2.1"
+    escape-string-regexp "^1.0.2"
+    has-ansi "^2.0.0"
+    strip-ansi "^3.0.0"
+    supports-color "^2.0.0"
+
+chalk@^2.3.0:
+  version "2.3.0"
+  resolved "chalk-2.3.0.tgz#b5ea48efc9c1793dccc9b4767c93914d3f2d52ba"
+  dependencies:
+    ansi-styles "^3.1.0"
+    escape-string-regexp "^1.0.5"
+    supports-color "^4.0.0"
+
+color-convert@^1.9.0:
+  version "1.9.1"
+  resolved "color-convert-1.9.1.tgz#c1261107aeb2f294ebffec9ed9ecad529a6097ed"
+  dependencies:
+    color-name "^1.1.1"
+
+color-name@^1.1.1:
+  version "1.1.3"
+  resolved "color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
+
+commander@^2.12.1:
+  version "2.13.0"
+  resolved "commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
+
+concat-map@0.0.1:
+  version "0.0.1"
+  resolved "concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
+
+diff@^3.2.0:
+  version "3.4.0"
+  resolved "diff-3.4.0.tgz#b1d85507daf3964828de54b37d0d73ba67dda56c"
+
+escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
+  version "1.0.5"
+  resolved "escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
+
+esprima@^4.0.0:
+  version "4.0.0"
+  resolved "esprima-4.0.0.tgz#4499eddcd1110e0b218bacf2fa7f7f59f55ca804"
+
+estree-walker@^0.5.2:
+  version "0.5.2"
+  resolved "estree-walker-0.5.2.tgz#d3850be7529c9580d815600b53126515e146dd39"
+
+esutils@^2.0.2:
+  version "2.0.2"
+  resolved "esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
+
+expand-brackets@^0.1.4:
+  version "0.1.5"
+  resolved "expand-brackets-0.1.5.tgz#df07284e342a807cd733ac5af72411e581d1177b"
+  dependencies:
+    is-posix-bracket "^0.1.0"
+
+expand-range@^1.8.1:
+  version "1.8.2"
+  resolved "expand-range-1.8.2.tgz#a299effd335fe2721ebae8e257ec79644fc85337"
+  dependencies:
+    fill-range "^2.1.0"
+
+extglob@^0.3.1:
+  version "0.3.2"
+  resolved "glob-0.3.2.tgz#2e18ff3d2f49ab2765cec9023f011daa8d8349a1"
+  dependencies:
+    is-extglob "^1.0.0"
+
+filename-regex@^2.0.0:
+  version "2.0.1"
+  resolved "filename-regex-2.0.1.tgz#c1c4b9bee3e09725ddb106b75c1e301fe2f18b26"
+
+fill-range@^2.1.0:
+  version "2.2.4"
+  resolved "fill-range-2.2.4.tgz#eb1e773abb056dcd8df2bfdf6af59b8b3a936565"
+  dependencies:
+    is-number "^2.1.0"
+    isobject "^2.0.0"
+    randomatic "^3.0.0"
+    repeat-element "^1.1.2"
+    repeat-string "^1.5.2"
+
+for-in@^1.0.1:
+  version "1.0.2"
+  resolved "for-in-1.0.2.tgz#81068d295a8142ec0ac726c6e2200c30fb6d5e80"
+
+for-own@^0.1.4:
+  version "0.1.5"
+  resolved "for-own-0.1.5.tgz#5265c681a4f294dabbf17c9509b6763aa84510ce"
+  dependencies:
+    for-in "^1.0.1"
+
+fs.realpath@^1.0.0:
+  version "1.0.0"
+  resolved "fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
+
+glob-base@^0.3.0:
+  version "0.3.0"
+  resolved "glob-base-0.3.0.tgz#dbb164f6221b1c0b1ccf82aea328b497df0ea3c4"
+  dependencies:
+    glob-parent "^2.0.0"
+    is-glob "^2.0.0"
+
+glob-parent@^2.0.0:
+  version "2.0.0"
+  resolved "glob-parent-2.0.0.tgz#81383d72db054fcccf5336daa902f182f6edbb28"
+  dependencies:
+    is-glob "^2.0.0"
+
+glob@^7.1.1:
+  version "7.1.2"
+  resolved "glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
+  dependencies:
+    fs.realpath "^1.0.0"
+    inflight "^1.0.4"
+    inherits "2"
+    minimatch "^3.0.4"
+    once "^1.3.0"
+    path-is-absolute "^1.0.0"
+
+has-ansi@^2.0.0:
+  version "2.0.0"
+  resolved "has-ansi-2.0.0.tgz#34f5049ce1ecdf2b0649af3ef24e45ed35416d91"
+  dependencies:
+    ansi-regex "^2.0.0"
+
+has-flag@^2.0.0:
+  version "2.0.0"
+  resolved "has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
+
+inflight@^1.0.4:
+  version "1.0.6"
+  resolved "inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
+  dependencies:
+    once "^1.3.0"
+    wrappy "1"
+
+inherits@2:
+  version "2.0.3"
+  resolved "inherits-2.0.3.tgz#633c2c83e3da42a502f52466022480f4208261de"
+
+is-buffer@^1.1.5:
+  version "1.1.6"
+  resolved "is-buffer-1.1.6.tgz#efaa2ea9daa0d7ab2ea13a97b2b8ad51fefbe8be"
+
+is-dotfile@^1.0.0:
+  version "1.0.3"
+  resolved "is-dotfile-1.0.3.tgz#a6a2f32ffd2dfb04f5ca25ecd0f6b83cf798a1e1"
+
+is-equal-shallow@^0.1.3:
+  version "0.1.3"
+  resolved "allow/-/is-equal-shallow-0.1.3.tgz#2238098fc221de0bcfa5d9eac4c45d638aa1c534"
+  dependencies:
+    is-primitive "^2.0.0"
+
+is-extendable@^0.1.1:
+  version "0.1.1"
+  resolved "is-extendable-0.1.1.tgz#62b110e289a471418e3ec36a617d472e301dfc89"
+
+is-extglob@^1.0.0:
+  version "1.0.0"
+  resolved "is-extglob-1.0.0.tgz#ac468177c4943405a092fc8f29760c6ffc6206c0"
+
+is-glob@^2.0.0, is-glob@^2.0.1:
+  version "2.0.1"
+  resolved "is-glob-2.0.1.tgz#d096f926a3ded5600f3fdfd91198cb0888c2d863"
+  dependencies:
+    is-extglob "^1.0.0"
+
+is-module@^1.0.0:
+  version "1.0.0"
+  resolved "is-module-1.0.0.tgz#3258fb69f78c14d5b815d664336b4cffb6441591"
+
+is-number@^2.1.0:
+  version "2.1.0"
+  resolved "is-number-2.1.0.tgz#01fcbbb393463a548f2f466cce16dece49db908f"
+  dependencies:
+    kind-of "^3.0.2"
+
+is-number@^4.0.0:
+  version "4.0.0"
+  resolved "is-number-4.0.0.tgz#0026e37f5454d73e356dfe6564699867c6a7f0ff"
+
+is-posix-bracket@^0.1.0:
+  version "0.1.1"
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+
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+  resolved "is-primitive-2.0.0.tgz#207bab91638499c07b2adf240a41a87210034575"
+
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+  resolved "rray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
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+  resolved "bject-2.1.0.tgz#f065561096a3f1da2ef46272f815c840d87e0c89"
+  dependencies:
+    isarray "1.0.0"
+
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+  resolved "js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
+
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+  version "3.10.0"
+  resolved "js-yaml-3.10.0.tgz#2e78441646bd4682e963f22b6e92823c309c62dc"
+  dependencies:
+    argparse "^1.0.7"
+    esprima "^4.0.0"
+
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+  resolved "kind-of-3.2.2.tgz#31ea21a734bab9bbb0f32466d893aea51e4a3c64"
+  dependencies:
+    is-buffer "^1.1.5"
+
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+  version "6.0.2"
+  resolved "kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
+
+magic-string@^0.25.1:
+  version "0.25.1"
+  resolved "magic-string-0.25.1.tgz#b1c248b399cd7485da0fe7385c2fc7011843266e"
+  dependencies:
+    sourcemap-codec "^1.4.1"
+
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+  version "1.0.1"
+  resolved "math-random-1.0.1.tgz#8b3aac588b8a66e4975e3cdea67f7bb329601fac"
+
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+  version "2.3.11"
+  resolved "romatch-2.3.11.tgz#86677c97d1720b363431d04d0d15293bd38c1565"
+  dependencies:
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+    braces "^1.8.2"
+    expand-brackets "^0.1.4"
+    extglob "^0.3.1"
+    filename-regex "^2.0.0"
+    is-extglob "^1.0.0"
+    is-glob "^2.0.1"
+    kind-of "^3.0.2"
+    normalize-path "^2.0.1"
+    object.omit "^2.0.0"
+    parse-glob "^3.0.4"
+    regex-cache "^0.4.2"
+
+minimatch@^3.0.4:
+  version "3.0.4"
+  resolved "minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
+  dependencies:
+    brace-expansion "^1.1.7"
+
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+  version "2.1.1"
+  resolved "normalize-path-2.1.1.tgz#1ab28b556e198363a8c1a6f7e6fa20137fe6aed9"
+  dependencies:
+    remove-trailing-separator "^1.0.1"
+
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+  version "2.0.1"
+  resolved "object.omit-2.0.1.tgz#1a9c744829f39dbb858c76ca3579ae2a54ebd1fa"
+  dependencies:
+    for-own "^0.1.4"
+    is-extendable "^0.1.1"
+
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+  version "1.4.0"
+  resolved "once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
+  dependencies:
+    wrappy "1"
+
+parse-glob@^3.0.4:
+  version "3.0.4"
+  resolved "parse-glob-3.0.4.tgz#b2c376cfb11f35513badd173ef0bb6e3a388391c"
+  dependencies:
+    glob-base "^0.3.0"
+    is-dotfile "^1.0.0"
+    is-extglob "^1.0.0"
+    is-glob "^2.0.0"
+
+path-is-absolute@^1.0.0:
+  version "1.0.1"
+  resolved "path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
+
+path-parse@^1.0.5:
+  version "1.0.5"
+  resolved "path-parse-1.0.5.tgz#3c1adf871ea9cd6c9431b6ea2bd74a0ff055c4c1"
+
+preserve@^0.2.0:
+  version "0.2.0"
+  resolved "serve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
+
+randomatic@^3.0.0:
+  version "3.1.1"
+  resolved "domatic-3.1.1.tgz#b776efc59375984e36c537b2f51a1f0aff0da1ed"
+  dependencies:
+    is-number "^4.0.0"
+    kind-of "^6.0.0"
+    math-random "^1.0.1"
+
+regex-cache@^0.4.2:
+  version "0.4.4"
+  resolved "regex-cache-0.4.4.tgz#75bdc58a2a1496cec48a12835bc54c8d562336dd"
+  dependencies:
+    is-equal-shallow "^0.1.3"
+
+remove-trailing-separator@^1.0.1:
+  version "1.1.0"
+  resolved "parator/-/remove-trailing-separator-1.1.0.tgz#c24bce2a283adad5bc3f58e0d48249b92379d8ef"
+
+repeat-element@^1.1.2:
+  version "1.1.3"
+  resolved "repeat-element-1.1.3.tgz#782e0d825c0c5a3bb39731f84efee6b742e6b1ce"
+
+repeat-string@^1.5.2:
+  version "1.6.1"
+  resolved "repeat-string-1.6.1.tgz#8dcae470e1c88abc2d600fff4a776286da75e637"
+
+resolve@^1.1.6, resolve@^1.8.1:
+  version "1.8.1"
+  resolved "olve-1.8.1.tgz#82f1ec19a423ac1fbd080b0bab06ba36e84a7a26"
+  dependencies:
+    path-parse "^1.0.5"
+
+resolve@^1.3.2:
+  version "1.5.0"
+  resolved "resolve-1.5.0.tgz#1f09acce796c9a762579f31b2c1cc4c3cddf9f36"
+  dependencies:
+    path-parse "^1.0.5"
+
+rollup-plugin-commonjs@^9.2.0:
+  version "9.2.0"
+  resolved "mmonjs/-/rollup-plugin-commonjs-9.2.0.tgz#4604e25069e0c78a09e08faa95dc32dec27f7c89"
+  dependencies:
+    estree-walker "^0.5.2"
+    magic-string "^0.25.1"
+    resolve "^1.8.1"
+    rollup-pluginutils "^2.3.3"
+
+rollup-plugin-node-resolve@^3.4.0:
+  version "3.4.0"
+  resolved "de-resolve/-/rollup-plugin-node-resolve-3.4.0.tgz#908585eda12e393caac7498715a01e08606abc89"
+  dependencies:
+    builtin-modules "^2.0.0"
+    is-module "^1.0.0"
+    resolve "^1.1.6"
+
+rollup-pluginutils@^2.3.3:
+  version "2.3.3"
+  resolved "rollup-pluginutils-2.3.3.tgz#3aad9b1eb3e7fe8262820818840bf091e5ae6794"
+  dependencies:
+    estree-walker "^0.5.2"
+    micromatch "^2.3.11"
+
+rollup@^0.66.6:
+  version "0.66.6"
+  resolved "lup-0.66.6.tgz#ce7d6185beb7acea644ce220c25e71ae03275482"
+  dependencies:
+    "@types/estree" "0.0.39"
+    "@types/node" "*"
+
+semver@^5.3.0:
+  version "5.5.0"
+  resolved "semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
+
+sourcemap-codec@^1.4.1:
+  version "1.4.3"
+  resolved "sourcemap-codec-1.4.3.tgz#0ba615b73ec35112f63c2f2d9e7c3f87282b0e33"
+
+sprintf-js@~1.0.2:
+  version "1.0.3"
+  resolved "sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
+
+strip-ansi@^3.0.0:
+  version "3.0.1"
+  resolved "strip-ansi-3.0.1.tgz#6a385fb8853d952d5ff05d0e8aaf94278dc63dcf"
+  dependencies:
+    ansi-regex "^2.0.0"
+
+supports-color@^2.0.0:
+  version "2.0.0"
+  resolved "supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"
+
+supports-color@^4.0.0:
+  version "4.5.0"
+  resolved "supports-color-4.5.0.tgz#be7a0de484dec5c5cddf8b3d59125044912f635b"
+  dependencies:
+    has-flag "^2.0.0"
+
+tslib@^1.8.0, tslib@^1.8.1:
+  version "1.9.0"
+  resolved "tslib-1.9.0.tgz#e37a86fda8cbbaf23a057f473c9f4dc64e5fc2e8"
+
+tslint@^5.9.1:
+  version "5.9.1"
+  resolved "tslint-5.9.1.tgz#1255f87a3ff57eb0b0e1f0e610a8b4748046c9ae"
+  dependencies:
+    babel-code-frame "^6.22.0"
+    builtin-modules "^1.1.1"
+    chalk "^2.3.0"
+    commander "^2.12.1"
+    diff "^3.2.0"
+    glob "^7.1.1"
+    js-yaml "^3.7.0"
+    minimatch "^3.0.4"
+    resolve "^1.3.2"
+    semver "^5.3.0"
+    tslib "^1.8.0"
+    tsutils "^2.12.1"
+
+tsutils@^2.12.1:
+  version "2.19.1"
+  resolved "tsutils-2.19.1.tgz#76d7ebdea9d7a7bf4a05f50ead3701b0168708d7"
+  dependencies:
+    tslib "^1.8.1"
+
+typescript@3.0.1:
+  version "3.0.1"
+  resolved "typescript-3.0.1.tgz#43738f29585d3a87575520a4b93ab6026ef11fdb"
+
+wrappy@1:
+  version "1.0.2"
+  resolved "wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
diff --git a/javascript/extractor/lib/typescript/yarnrc-build b/javascript/extractor/lib/typescript/yarnrc-build
new file mode 100644
index 00000000000..e9b20e22b8a
--- /dev/null
+++ b/javascript/extractor/lib/typescript/yarnrc-build
@@ -0,0 +1 @@
+yarn-offline-mirror "./yarn-mirror"
diff --git a/javascript/extractor/parser-tests/babylon/README.md b/javascript/extractor/parser-tests/babylon/README.md
new file mode 100644
index 00000000000..05d086ba1c7
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/README.md
@@ -0,0 +1,3 @@
+These tests are semi-automatically generated from the [Babel](https://github.com/babel/babel) test suite.
+
+For each test, `actual.js` is the input and `expected.ast` is the expected output pattern.
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/actual.js b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/actual.js
new file mode 100644
index 00000000000..f2b5d0c2d1c
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/actual.js
@@ -0,0 +1,4 @@
+class Foo {
+  p = x
+  [m] () {}
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/expected.error b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/expected.error
new file mode 100644
index 00000000000..191231ec9da
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-computed/expected.error
@@ -0,0 +1 @@
+Unexpected token (3:9)
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/actual.js b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/actual.js
new file mode 100644
index 00000000000..73d810b1278
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/actual.js
@@ -0,0 +1,4 @@
+class Foo {
+  p = x
+  *m () {}
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/expected.error b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/expected.error
new file mode 100644
index 00000000000..69b84c48b2c
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-failure-generator/expected.error
@@ -0,0 +1 @@
+Unexpected token (3:8)
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/actual.js b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/actual.js
new file mode 100644
index 00000000000..2e57778bbb2
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/actual.js
@@ -0,0 +1,9 @@
+class Foo {
+  x
+  y
+}
+
+class Foo {
+  p
+  [m] () {}
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/expected.ast
new file mode 100644
index 00000000000..2040bb70db8
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/class-properties/asi-success/expected.ast
@@ -0,0 +1,275 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 10,
+      "column": 0,
+      "offset": 53
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 4,
+          "column": 1,
+          "offset": 21
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 4,
+            "column": 1,
+            "offset": 21
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 2,
+                "offset": 14
+              },
+              "end": {
+                "line": 2,
+                "column": 3,
+                "offset": 15
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2,
+                  "offset": 14
+                },
+                "end": {
+                  "line": 2,
+                  "column": 3,
+                  "offset": 15
+                }
+              },
+              "name": "x"
+            },
+            "static": false,
+            "value": null
+          },
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 3,
+                "column": 2,
+                "offset": 18
+              },
+              "end": {
+                "line": 3,
+                "column": 3,
+                "offset": 19
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 3,
+                  "column": 2,
+                  "offset": 18
+                },
+                "end": {
+                  "line": 3,
+                  "column": 3,
+                  "offset": 19
+                }
+              },
+              "name": "y"
+            },
+            "static": false,
+            "value": null
+          }
+        ]
+      }
+    },
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 6,
+          "column": 0,
+          "offset": 23
+        },
+        "end": {
+          "line": 9,
+          "column": 1,
+          "offset": 52
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 6,
+            "column": 6,
+            "offset": 29
+          },
+          "end": {
+            "line": 6,
+            "column": 9,
+            "offset": 32
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 6,
+            "column": 10,
+            "offset": 33
+          },
+          "end": {
+            "line": 9,
+            "column": 1,
+            "offset": 52
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 7,
+                "column": 2,
+                "offset": 37
+              },
+              "end": {
+                "line": 7,
+                "column": 3,
+                "offset": 38
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 7,
+                  "column": 2,
+                  "offset": 37
+                },
+                "end": {
+                  "line": 7,
+                  "column": 3,
+                  "offset": 38
+                }
+              },
+              "name": "p"
+            },
+            "static": false,
+            "value": null
+          },
+          {
+            "type": "MethodDefinition",
+            "loc": {
+              "start": {
+                "line": 8,
+                "column": 2,
+                "offset": 41
+              },
+              "end": {
+                "line": 8,
+                "column": 11,
+                "offset": 50
+              }
+            },
+            "computed": true,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 8,
+                  "column": 3,
+                  "offset": 42
+                },
+                "end": {
+                  "line": 8,
+                  "column": 4,
+                  "offset": 43
+                }
+              },
+              "name": "m"
+            },
+            "static": false,
+            "kind": "method",
+            "value": {
+              "type": "FunctionExpression",
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "params": [],
+              "body": {
+                "type": "BlockStatement",
+                "loc": {
+                  "start": {
+                    "line": 8,
+                    "column": 9,
+                    "offset": 48
+                  },
+                  "end": {
+                    "line": 8,
+                    "column": 11,
+                    "offset": 50
+                  }
+                },
+                "body": []
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/actual.js b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/actual.js
new file mode 100644
index 00000000000..203379b698e
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/actual.js
@@ -0,0 +1,3 @@
+function foo() {
+  return function.sent;
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/expected.error b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/expected.error
new file mode 100644
index 00000000000..752c1812243
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-function/expected.error
@@ -0,0 +1 @@
+Unexpected token (2:17)
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/actual.js b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/actual.js
new file mode 100644
index 00000000000..28760b261bd
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/actual.js
@@ -0,0 +1,3 @@
+function* foo() {
+  return function.sent;
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/expected.ast
new file mode 100644
index 00000000000..00b505b9142
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/inside-generator/expected.ast
@@ -0,0 +1,131 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 0,
+      "offset": 44
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "FunctionDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 3,
+          "column": 1,
+          "offset": 43
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 13,
+            "offset": 13
+          }
+        },
+        "name": "foo"
+      },
+      "generator": true,
+      "expression": false,
+      "params": [],
+      "body": {
+        "type": "BlockStatement",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 16,
+            "offset": 16
+          },
+          "end": {
+            "line": 3,
+            "column": 1,
+            "offset": 43
+          }
+        },
+        "body": [
+          {
+            "type": "ReturnStatement",
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 2,
+                "offset": 20
+              },
+              "end": {
+                "line": 2,
+                "column": 23,
+                "offset": 41
+              }
+            },
+            "argument": {
+              "type": "MetaProperty",
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 9,
+                  "offset": 27
+                },
+                "end": {
+                  "line": 2,
+                  "column": 22,
+                  "offset": 40
+                }
+              },
+              "meta": {
+                "type": "Identifier",
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 9,
+                    "offset": 27
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 17,
+                    "offset": 35
+                  }
+                },
+                "name": "function"
+              },
+              "property": {
+                "type": "Identifier",
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 18,
+                    "offset": 36
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 22,
+                    "offset": 40
+                  }
+                },
+                "name": "sent"
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/actual.js b/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/actual.js
new file mode 100644
index 00000000000..871b7794bbe
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/actual.js
@@ -0,0 +1,3 @@
+function* foo() {
+  return function.next;
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/expected.error b/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/expected.error
new file mode 100644
index 00000000000..3d5c42e1d50
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/function-sent/invalid-property/expected.error
@@ -0,0 +1 @@
+The only valid meta property for function is function.sent (2:18)
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/actual.js
new file mode 100644
index 00000000000..8565fdd2077
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/actual.js
@@ -0,0 +1 @@
+let {x, ...y} = z
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/expected.ast
new file mode 100644
index 00000000000..4a83d54a02c
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/10/expected.ast
@@ -0,0 +1,169 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 17,
+      "offset": 17
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 17,
+          "offset": 17
+        }
+      },
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 17,
+              "offset": 17
+            }
+          },
+          "id": {
+            "type": "ObjectPattern",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 13,
+                "offset": 13
+              }
+            },
+            "properties": [
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 6,
+                    "offset": 6
+                  }
+                },
+                "method": false,
+                "shorthand": true,
+                "computed": false,
+                "key": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 5,
+                      "offset": 5
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 6,
+                      "offset": 6
+                    }
+                  },
+                  "name": "x"
+                },
+                "value": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 5,
+                      "offset": 5
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 6,
+                      "offset": 6
+                    }
+                  },
+                  "name": "x"
+                }
+              },
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 8,
+                    "offset": 8
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 12,
+                    "offset": 12
+                  }
+                },
+                "key": null,
+                "value": {
+                  "type": "RestElement",
+                  "argument": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 11,
+                        "offset": 11
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 12,
+                        "offset": 12
+                      }
+                    },
+                    "name": "y"
+                  }
+                }
+              }
+            ]
+          },
+          "init": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 16,
+                "offset": 16
+              },
+              "end": {
+                "line": 1,
+                "column": 17,
+                "offset": 17
+              }
+            },
+            "name": "z"
+          }
+        }
+      ],
+      "kind": "let"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/actual.js
new file mode 100644
index 00000000000..7ced2f10721
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/actual.js
@@ -0,0 +1 @@
+(function({x, ...y}) { })
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/expected.ast
new file mode 100644
index 00000000000..fef52f80a08
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/11/expected.ast
@@ -0,0 +1,171 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 25,
+      "offset": 25
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 25,
+          "offset": 25
+        }
+      },
+      "expression": {
+        "type": "FunctionExpression",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 1,
+            "offset": 1
+          },
+          "end": {
+            "line": 1,
+            "column": 24,
+            "offset": 24
+          }
+        },
+        "id": null,
+        "generator": false,
+        "expression": false,
+        "params": [
+          {
+            "type": "ObjectPattern",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              },
+              "end": {
+                "line": 1,
+                "column": 19,
+                "offset": 19
+              }
+            },
+            "properties": [
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 11,
+                    "offset": 11
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 12,
+                    "offset": 12
+                  }
+                },
+                "method": false,
+                "shorthand": true,
+                "computed": false,
+                "key": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11,
+                      "offset": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12,
+                      "offset": 12
+                    }
+                  },
+                  "name": "x"
+                },
+                "value": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11,
+                      "offset": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12,
+                      "offset": 12
+                    }
+                  },
+                  "name": "x"
+                }
+              },
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 14,
+                    "offset": 14
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 18,
+                    "offset": 18
+                  }
+                },
+                "key": null,
+                "value": {
+                  "type": "RestElement",
+                  "argument": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 17,
+                        "offset": 17
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 18,
+                        "offset": 18
+                      }
+                    },
+                    "name": "y"
+                  }
+                }
+              }
+            ]
+          }
+        ],
+        "body": {
+          "type": "BlockStatement",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 21,
+              "offset": 21
+            },
+            "end": {
+              "line": 1,
+              "column": 24,
+              "offset": 24
+            }
+          },
+          "body": []
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/actual.js
new file mode 100644
index 00000000000..000fbd58f4d
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/actual.js
@@ -0,0 +1 @@
+let z = {...x}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/expected.ast
new file mode 100644
index 00000000000..e7334f30b09
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/12/expected.ast
@@ -0,0 +1,119 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 14,
+      "offset": 14
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 14,
+          "offset": 14
+        }
+      },
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 14,
+              "offset": 14
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 5,
+                "offset": 5
+              }
+            },
+            "name": "z"
+          },
+          "init": {
+            "type": "ObjectExpression",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 8,
+                "offset": 8
+              },
+              "end": {
+                "line": 1,
+                "column": 14,
+                "offset": 14
+              }
+            },
+            "properties": [
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 13,
+                    "offset": 13
+                  }
+                },
+                "key": null,
+                "value": {
+                  "type": "SpreadElement",
+                  "argument": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 12,
+                        "offset": 12
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 13,
+                        "offset": 13
+                      }
+                    },
+                    "name": "x"
+                  }
+                }
+              }
+            ]
+          }
+        }
+      ],
+      "kind": "let"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/actual.js
new file mode 100644
index 00000000000..72dfb8692ad
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/actual.js
@@ -0,0 +1 @@
+z = {x, ...y}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/expected.ast
new file mode 100644
index 00000000000..15fc6aa2cdf
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/13/expected.ast
@@ -0,0 +1,167 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 13,
+      "offset": 13
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 13,
+          "offset": 13
+        }
+      },
+      "expression": {
+        "type": "AssignmentExpression",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13,
+            "offset": 13
+          }
+        },
+        "operator": "=",
+        "left": {
+          "type": "Identifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 1,
+              "offset": 1
+            }
+          },
+          "name": "z"
+        },
+        "right": {
+          "type": "ObjectExpression",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 13,
+              "offset": 13
+            }
+          },
+          "properties": [
+            {
+              "type": "Property",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5,
+                  "offset": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 6,
+                  "offset": 6
+                }
+              },
+              "method": false,
+              "shorthand": true,
+              "computed": false,
+              "key": {
+                "type": "Identifier",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 6,
+                    "offset": 6
+                  }
+                },
+                "name": "x"
+              },
+              "value": {
+                "type": "Identifier",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 6,
+                    "offset": 6
+                  }
+                },
+                "name": "x"
+              }
+            },
+            {
+              "type": "Property",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 8,
+                  "offset": 8
+                },
+                "end": {
+                  "line": 1,
+                  "column": 12,
+                  "offset": 12
+                }
+              },
+              "key": null,
+              "value": {
+                "type": "SpreadElement",
+                "argument": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 11,
+                      "offset": 11
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 12,
+                      "offset": 12
+                    }
+                  },
+                  "name": "y"
+                }
+              }
+            }
+          ]
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/14/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/14/actual.js
new file mode 100644
index 00000000000..3a17541c454
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/14/actual.js
@@ -0,0 +1 @@
+({x, ...y, a, ...b, c})
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/actual.js
new file mode 100644
index 00000000000..c6d5f10ef69
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/actual.js
@@ -0,0 +1 @@
+@foo class Foo {}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/expected.ast
new file mode 100644
index 00000000000..6f9d36941ea
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/33/expected.ast
@@ -0,0 +1,99 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 17,
+      "offset": 17
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 5,
+          "offset": 5
+        },
+        "end": {
+          "line": 1,
+          "column": 17,
+          "offset": 17
+        }
+      },
+      "decorators": [
+        {
+          "type": "Decorator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            }
+          },
+          "expression": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            },
+            "name": "foo"
+          }
+        }
+      ],
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 11,
+            "offset": 11
+          },
+          "end": {
+            "line": 1,
+            "column": 14,
+            "offset": 14
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 15,
+            "offset": 15
+          },
+          "end": {
+            "line": 1,
+            "column": 17,
+            "offset": 17
+          }
+        },
+        "body": []
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/actual.js
new file mode 100644
index 00000000000..a0f242f8ee6
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/actual.js
@@ -0,0 +1 @@
+var Foo = @foo class Foo {}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/expected.ast
new file mode 100644
index 00000000000..3fc711a2fb6
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/34/expected.ast
@@ -0,0 +1,148 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 27,
+      "offset": 27
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 27,
+          "offset": 27
+        }
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+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
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+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 27,
+              "offset": 27
+            }
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+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              }
+            },
+            "name": "Foo"
+          },
+          "init": {
+            "type": "ClassExpression",
+            "loc": {
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+                "line": 1,
+                "column": 15,
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+                "column": 27,
+                "offset": 27
+              }
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+                    "offset": 14
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+                    },
+                    "end": {
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+                      "column": 14,
+                      "offset": 14
+                    }
+                  },
+                  "name": "foo"
+                }
+              }
+            ],
+            "id": {
+              "type": "Identifier",
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+                  "offset": 24
+                }
+              },
+              "name": "Foo"
+            },
+            "superClass": null,
+            "body": {
+              "type": "ClassBody",
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+                  "offset": 25
+                },
+                "end": {
+                  "line": 1,
+                  "column": 27,
+                  "offset": 27
+                }
+              },
+              "body": []
+            }
+          }
+        }
+      ],
+      "kind": "var"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/actual.js
new file mode 100644
index 00000000000..c65a987c325
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/actual.js
@@ -0,0 +1 @@
+class Foo { @foo bar() {} }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/expected.ast
new file mode 100644
index 00000000000..d88b15740c9
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/35/expected.ast
@@ -0,0 +1,157 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 27,
+      "offset": 27
+    }
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+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
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+          "column": 0,
+          "offset": 0
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+        "end": {
+          "line": 1,
+          "column": 27,
+          "offset": 27
+        }
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+      "id": {
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+        "loc": {
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+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 27,
+            "offset": 27
+          }
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+        "body": [
+          {
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+            "loc": {
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+                "column": 17,
+                "offset": 17
+              },
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+                "column": 25,
+                "offset": 25
+              }
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+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 16,
+                    "offset": 16
+                  }
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+                      "offset": 13
+                    },
+                    "end": {
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+                      "column": 16,
+                      "offset": 16
+                    }
+                  },
+                  "name": "foo"
+                }
+              }
+            ],
+            "computed": false,
+            "key": {
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+              "loc": {
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+                  "offset": 17
+                },
+                "end": {
+                  "line": 1,
+                  "column": 20,
+                  "offset": 20
+                }
+              },
+              "name": "bar"
+            },
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+            "kind": "method",
+            "value": {
+              "type": "FunctionExpression",
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "params": [],
+              "body": {
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+                    "offset": 23
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 25,
+                    "offset": 25
+                  }
+                },
+                "body": []
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/actual.js
new file mode 100644
index 00000000000..a36562fb4f5
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/actual.js
@@ -0,0 +1 @@
+class Foo { @foo set bar(f) {} }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/expected.ast
new file mode 100644
index 00000000000..83094c3befc
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/36/expected.ast
@@ -0,0 +1,174 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 32,
+      "offset": 32
+    }
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+          "column": 0,
+          "offset": 0
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+          "line": 1,
+          "column": 32,
+          "offset": 32
+        }
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+      "id": {
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+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
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+          "end": {
+            "line": 1,
+            "column": 32,
+            "offset": 32
+          }
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+          {
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+                "column": 17,
+                "offset": 17
+              },
+              "end": {
+                "line": 1,
+                "column": 30,
+                "offset": 30
+              }
+            },
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+                "type": "Decorator",
+                "loc": {
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+                    "column": 12,
+                    "offset": 12
+                  },
+                  "end": {
+                    "line": 1,
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+                    "offset": 16
+                  }
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+                      "offset": 13
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 16,
+                      "offset": 16
+                    }
+                  },
+                  "name": "foo"
+                }
+              }
+            ],
+            "computed": false,
+            "key": {
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+                },
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+                  "column": 24,
+                  "offset": 24
+                }
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+              "name": "bar"
+            },
+            "static": false,
+            "kind": "set",
+            "value": {
+              "type": "FunctionExpression",
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "params": [
+                {
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+                  "loc": {
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+                      "column": 25,
+                      "offset": 25
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 26,
+                      "offset": 26
+                    }
+                  },
+                  "name": "f"
+                }
+              ],
+              "body": {
+                "type": "BlockStatement",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 28,
+                    "offset": 28
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 30,
+                    "offset": 30
+                  }
+                },
+                "body": []
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/actual.js
new file mode 100644
index 00000000000..6c4ad753dcc
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/actual.js
@@ -0,0 +1 @@
+class Foo { @foo get bar() {} }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/expected.ast
new file mode 100644
index 00000000000..c7ffc25c057
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/37/expected.ast
@@ -0,0 +1,157 @@
+{
+  "type": "Program",
+  "loc": {
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+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 31,
+      "offset": 31
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
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+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 31,
+          "offset": 31
+        }
+      },
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+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 31,
+            "offset": 31
+          }
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+        "body": [
+          {
+            "type": "MethodDefinition",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 17,
+                "offset": 17
+              },
+              "end": {
+                "line": 1,
+                "column": 29,
+                "offset": 29
+              }
+            },
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+              {
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+                    "offset": 12
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+                  "end": {
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+                    "column": 16,
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+                      "offset": 13
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+                    "end": {
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+                      "column": 16,
+                      "offset": 16
+                    }
+                  },
+                  "name": "foo"
+                }
+              }
+            ],
+            "computed": false,
+            "key": {
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+              "loc": {
+                "start": {
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+                  "offset": 21
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24,
+                  "offset": 24
+                }
+              },
+              "name": "bar"
+            },
+            "static": false,
+            "kind": "get",
+            "value": {
+              "type": "FunctionExpression",
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "params": [],
+              "body": {
+                "type": "BlockStatement",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 27,
+                    "offset": 27
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 29,
+                    "offset": 29
+                  }
+                },
+                "body": []
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/actual.js
new file mode 100644
index 00000000000..4539abd91de
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/actual.js
@@ -0,0 +1 @@
+class Foo { @foo @bar bar() {} }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/expected.ast
new file mode 100644
index 00000000000..7e7e8d0cc4b
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/38/expected.ast
@@ -0,0 +1,188 @@
+{
+  "type": "Program",
+  "loc": {
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+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 32,
+      "offset": 32
+    }
+  },
+  "sourceType": "script",
+  "body": [
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+      "type": "ClassDeclaration",
+      "loc": {
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+          "line": 1,
+          "column": 0,
+          "offset": 0
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+        "end": {
+          "line": 1,
+          "column": 32,
+          "offset": 32
+        }
+      },
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+        "loc": {
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+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
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+      "body": {
+        "type": "ClassBody",
+        "loc": {
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+            "column": 10,
+            "offset": 10
+          },
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+            "column": 32,
+            "offset": 32
+          }
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+                "offset": 22
+              },
+              "end": {
+                "line": 1,
+                "column": 30,
+                "offset": 30
+              }
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+                    "offset": 12
+                  },
+                  "end": {
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+                    "column": 16,
+                    "offset": 16
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+                      "offset": 16
+                    }
+                  },
+                  "name": "foo"
+                }
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+                      "column": 21,
+                      "offset": 21
+                    }
+                  },
+                  "name": "bar"
+                }
+              }
+            ],
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 22,
+                  "offset": 22
+                },
+                "end": {
+                  "line": 1,
+                  "column": 25,
+                  "offset": 25
+                }
+              },
+              "name": "bar"
+            },
+            "static": false,
+            "kind": "method",
+            "value": {
+              "type": "FunctionExpression",
+              "id": null,
+              "generator": false,
+              "expression": false,
+              "params": [],
+              "body": {
+                "type": "BlockStatement",
+                "loc": {
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+                    "column": 28,
+                    "offset": 28
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 30,
+                    "offset": 30
+                  }
+                },
+                "body": []
+              }
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/actual.js
new file mode 100644
index 00000000000..d3fd2c6a4bd
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/actual.js
@@ -0,0 +1 @@
+@foo({ @bar foo: "bar" }) @bar class Foo {}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/expected.ast
new file mode 100644
index 00000000000..069b4de389b
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/39/expected.ast
@@ -0,0 +1,247 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
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+      "column": 0,
+      "offset": 0
+    },
+    "end": {
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+      "column": 43,
+      "offset": 43
+    }
+  },
+  "sourceType": "script",
+  "body": [
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+      "type": "ClassDeclaration",
+      "loc": {
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+          "column": 31,
+          "offset": 31
+        },
+        "end": {
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+          "column": 43,
+          "offset": 43
+        }
+      },
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+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 25,
+              "offset": 25
+            }
+          },
+          "expression": {
+            "type": "CallExpression",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 25,
+                "offset": 25
+              }
+            },
+            "callee": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1,
+                  "offset": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 4,
+                  "offset": 4
+                }
+              },
+              "name": "foo"
+            },
+            "arguments": [
+              {
+                "type": "ObjectExpression",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 24,
+                    "offset": 24
+                  }
+                },
+                "properties": [
+                  {
+                    "type": "Property",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 12,
+                        "offset": 12
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 22,
+                        "offset": 22
+                      }
+                    },
+                    "decorators": [
+                      {
+                        "type": "Decorator",
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 7,
+                            "offset": 7
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 11,
+                            "offset": 11
+                          }
+                        },
+                        "expression": {
+                          "type": "Identifier",
+                          "loc": {
+                            "start": {
+                              "line": 1,
+                              "column": 8,
+                              "offset": 8
+                            },
+                            "end": {
+                              "line": 1,
+                              "column": 11,
+                              "offset": 11
+                            }
+                          },
+                          "name": "bar"
+                        }
+                      }
+                    ],
+                    "method": false,
+                    "shorthand": false,
+                    "computed": false,
+                    "key": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 12,
+                          "offset": 12
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 15,
+                          "offset": 15
+                        }
+                      },
+                      "name": "foo"
+                    },
+                    "value": {
+                      "type": "Literal",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 17,
+                          "offset": 17
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 22,
+                          "offset": 22
+                        }
+                      },
+                      "value": "bar"
+                    }
+                  }
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "type": "Decorator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 26,
+              "offset": 26
+            },
+            "end": {
+              "line": 1,
+              "column": 30,
+              "offset": 30
+            }
+          },
+          "expression": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 27,
+                "offset": 27
+              },
+              "end": {
+                "line": 1,
+                "column": 30,
+                "offset": 30
+              }
+            },
+            "name": "bar"
+          }
+        }
+      ],
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 37,
+            "offset": 37
+          },
+          "end": {
+            "line": 1,
+            "column": 40,
+            "offset": 40
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 41,
+            "offset": 41
+          },
+          "end": {
+            "line": 1,
+            "column": 43,
+            "offset": 43
+          }
+        },
+        "body": []
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/actual.js
new file mode 100644
index 00000000000..87afe5bfdd0
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/actual.js
@@ -0,0 +1 @@
+@bar class Foo extends @foo class Bar {} {}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/expected.ast
new file mode 100644
index 00000000000..99aa541ea57
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/40/expected.ast
@@ -0,0 +1,179 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 43,
+      "offset": 43
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 5,
+          "offset": 5
+        },
+        "end": {
+          "line": 1,
+          "column": 43,
+          "offset": 43
+        }
+      },
+      "decorators": [
+        {
+          "type": "Decorator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            }
+          },
+          "expression": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            },
+            "name": "bar"
+          }
+        }
+      ],
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 11,
+            "offset": 11
+          },
+          "end": {
+            "line": 1,
+            "column": 14,
+            "offset": 14
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": {
+        "type": "ClassExpression",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 28,
+            "offset": 28
+          },
+          "end": {
+            "line": 1,
+            "column": 40,
+            "offset": 40
+          }
+        },
+        "decorators": [
+          {
+            "type": "Decorator",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 23,
+                "offset": 23
+              },
+              "end": {
+                "line": 1,
+                "column": 27,
+                "offset": 27
+              }
+            },
+            "expression": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 24,
+                  "offset": 24
+                },
+                "end": {
+                  "line": 1,
+                  "column": 27,
+                  "offset": 27
+                }
+              },
+              "name": "foo"
+            }
+          }
+        ],
+        "id": {
+          "type": "Identifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 34,
+              "offset": 34
+            },
+            "end": {
+              "line": 1,
+              "column": 37,
+              "offset": 37
+            }
+          },
+          "name": "Bar"
+        },
+        "superClass": null,
+        "body": {
+          "type": "ClassBody",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 38,
+              "offset": 38
+            },
+            "end": {
+              "line": 1,
+              "column": 40,
+              "offset": 40
+            }
+          },
+          "body": []
+        }
+      },
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 41,
+            "offset": 41
+          },
+          "end": {
+            "line": 1,
+            "column": 43,
+            "offset": 43
+          }
+        },
+        "body": []
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/actual.js
new file mode 100644
index 00000000000..71183011897
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/actual.js
@@ -0,0 +1 @@
+@foo function bar() {}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/expected.error b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/expected.error
new file mode 100644
index 00000000000..9eeb1eb11d0
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/41/expected.error
@@ -0,0 +1 @@
+Leading decorators must be attached to a class declaration (1:5)
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/actual.js
new file mode 100644
index 00000000000..3be9192a9aa
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/actual.js
@@ -0,0 +1 @@
+class Foo { @foo }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/expected.error b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/expected.error
new file mode 100644
index 00000000000..5ebbd6aceae
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/42/expected.error
@@ -0,0 +1,2 @@
+Unexpected token (1:17)
+
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/actual.js
new file mode 100644
index 00000000000..5a63df69ae7
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/actual.js
@@ -0,0 +1 @@
+class Foo { foo = "bar"; }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/expected.ast
new file mode 100644
index 00000000000..55af48d027d
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/43/expected.ast
@@ -0,0 +1,116 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 26,
+      "offset": 26
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 26,
+          "offset": 26
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 26,
+            "offset": 26
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 24,
+                "offset": 24
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 12,
+                  "offset": 12
+                },
+                "end": {
+                  "line": 1,
+                  "column": 15,
+                  "offset": 15
+                }
+              },
+              "name": "foo"
+            },
+            "static": false,
+            "value": {
+              "type": "Literal",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 18,
+                  "offset": 18
+                },
+                "end": {
+                  "line": 1,
+                  "column": 23,
+                  "offset": 23
+                }
+              },
+              "value": "bar"
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/actual.js
new file mode 100644
index 00000000000..221c093aace
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/actual.js
@@ -0,0 +1 @@
+class Foo { foo; }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/expected.ast
new file mode 100644
index 00000000000..727f6f92727
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/44/expected.ast
@@ -0,0 +1,101 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 18,
+      "offset": 18
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 18,
+          "offset": 18
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 18,
+            "offset": 18
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 16,
+                "offset": 16
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 12,
+                  "offset": 12
+                },
+                "end": {
+                  "line": 1,
+                  "column": 15,
+                  "offset": 15
+                }
+              },
+              "name": "foo"
+            },
+            "static": false,
+            "value": null
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/actual.js
new file mode 100644
index 00000000000..1ae36615822
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/actual.js
@@ -0,0 +1 @@
+class Foo { static foo; }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/expected.ast
new file mode 100644
index 00000000000..f63bf906f76
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/45/expected.ast
@@ -0,0 +1,101 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 25,
+      "offset": 25
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 25,
+          "offset": 25
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 25,
+            "offset": 25
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 23,
+                "offset": 23
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 19,
+                  "offset": 19
+                },
+                "end": {
+                  "line": 1,
+                  "column": 22,
+                  "offset": 22
+                }
+              },
+              "name": "foo"
+            },
+            "static": true,
+            "value": null
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/actual.js
new file mode 100644
index 00000000000..25cc418eb66
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/actual.js
@@ -0,0 +1 @@
+class Foo { static foo = "bar"; }
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/expected.ast
new file mode 100644
index 00000000000..c6933f156d8
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/46/expected.ast
@@ -0,0 +1,116 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 33,
+      "offset": 33
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 33,
+          "offset": 33
+        }
+      },
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 6,
+            "offset": 6
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        },
+        "name": "Foo"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 10,
+            "offset": 10
+          },
+          "end": {
+            "line": 1,
+            "column": 33,
+            "offset": 33
+          }
+        },
+        "body": [
+          {
+            "type": "FieldDefinition",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 31,
+                "offset": 31
+              }
+            },
+            "computed": false,
+            "key": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 19,
+                  "offset": 19
+                },
+                "end": {
+                  "line": 1,
+                  "column": 22,
+                  "offset": 22
+                }
+              },
+              "name": "foo"
+            },
+            "static": true,
+            "value": {
+              "type": "Literal",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 25,
+                  "offset": 25
+                },
+                "end": {
+                  "line": 1,
+                  "column": 30,
+                  "offset": 30
+                }
+              },
+              "value": "bar"
+            }
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/actual.js
new file mode 100644
index 00000000000..b62802cfd5a
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/actual.js
@@ -0,0 +1 @@
+var obj = { @foo bar: 'wow' };
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/expected.ast
new file mode 100644
index 00000000000..e004246301d
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/49/expected.ast
@@ -0,0 +1,167 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 30,
+      "offset": 30
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 30,
+          "offset": 30
+        }
+      },
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 29,
+              "offset": 29
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              }
+            },
+            "name": "obj"
+          },
+          "init": {
+            "type": "ObjectExpression",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              },
+              "end": {
+                "line": 1,
+                "column": 29,
+                "offset": 29
+              }
+            },
+            "properties": [
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 17,
+                    "offset": 17
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 27,
+                    "offset": 27
+                  }
+                },
+                "decorators": [
+                  {
+                    "type": "Decorator",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 12,
+                        "offset": 12
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 16,
+                        "offset": 16
+                      }
+                    },
+                    "expression": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 13,
+                          "offset": 13
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 16,
+                          "offset": 16
+                        }
+                      },
+                      "name": "foo"
+                    }
+                  }
+                ],
+                "method": false,
+                "shorthand": false,
+                "computed": false,
+                "key": {
+                  "type": "Identifier",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 17,
+                      "offset": 17
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 20,
+                      "offset": 20
+                    }
+                  },
+                  "name": "bar"
+                },
+                "value": {
+                  "type": "Literal",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 22,
+                      "offset": 22
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 27,
+                      "offset": 27
+                    }
+                  },
+                  "value": "wow"
+                }
+              }
+            ]
+          }
+        }
+      ],
+      "kind": "var"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/actual.js
new file mode 100644
index 00000000000..13079d9393a
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/actual.js
@@ -0,0 +1 @@
+export foo, { bar } from "bar";
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/expected.ast
new file mode 100644
index 00000000000..544a0e5386a
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/50/expected.ast
@@ -0,0 +1,129 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 31,
+      "offset": 31
+    }
+  },
+  "sourceType": "module",
+  "body": [
+    {
+      "type": "ExportNamedDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 31,
+          "offset": 31
+        }
+      },
+      "specifiers": [
+        {
+          "type": "ExportDefaultSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7,
+              "offset": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 10,
+              "offset": 10
+            }
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              },
+              "end": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              }
+            },
+            "name": "foo"
+          }
+        },
+        {
+          "type": "ExportSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 14,
+              "offset": 14
+            },
+            "end": {
+              "line": 1,
+              "column": 17,
+              "offset": 17
+            }
+          },
+          "local": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 14,
+                "offset": 14
+              },
+              "end": {
+                "line": 1,
+                "column": 17,
+                "offset": 17
+              }
+            },
+            "name": "bar"
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 14,
+                "offset": 14
+              },
+              "end": {
+                "line": 1,
+                "column": 17,
+                "offset": 17
+              }
+            },
+            "name": "bar"
+          }
+        }
+      ],
+      "source": {
+        "type": "Literal",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 25,
+            "offset": 25
+          },
+          "end": {
+            "line": 1,
+            "column": 30,
+            "offset": 30
+          }
+        },
+        "value": "bar"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/actual.js
new file mode 100644
index 00000000000..162e41ffadf
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/actual.js
@@ -0,0 +1 @@
+export * as foo, { bar } from "bar";
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/expected.ast
new file mode 100644
index 00000000000..e023b0931a0
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/51/expected.ast
@@ -0,0 +1,129 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 36,
+      "offset": 36
+    }
+  },
+  "sourceType": "module",
+  "body": [
+    {
+      "type": "ExportNamedDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 36,
+          "offset": 36
+        }
+      },
+      "specifiers": [
+        {
+          "type": "ExportNamespaceSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7,
+              "offset": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 15,
+              "offset": 15
+            }
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 15,
+                "offset": 15
+              }
+            },
+            "name": "foo"
+          }
+        },
+        {
+          "type": "ExportSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 19,
+              "offset": 19
+            },
+            "end": {
+              "line": 1,
+              "column": 22,
+              "offset": 22
+            }
+          },
+          "local": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 19,
+                "offset": 19
+              },
+              "end": {
+                "line": 1,
+                "column": 22,
+                "offset": 22
+              }
+            },
+            "name": "bar"
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 19,
+                "offset": 19
+              },
+              "end": {
+                "line": 1,
+                "column": 22,
+                "offset": 22
+              }
+            },
+            "name": "bar"
+          }
+        }
+      ],
+      "source": {
+        "type": "Literal",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 30,
+            "offset": 30
+          },
+          "end": {
+            "line": 1,
+            "column": 35,
+            "offset": 35
+          }
+        },
+        "value": "bar"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/actual.js
new file mode 100644
index 00000000000..82e06ef4fe2
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/actual.js
@@ -0,0 +1 @@
+export foo from "bar";
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/expected.ast
new file mode 100644
index 00000000000..52efe1d7554
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/52/expected.ast
@@ -0,0 +1,82 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 22,
+      "offset": 22
+    }
+  },
+  "sourceType": "module",
+  "body": [
+    {
+      "type": "ExportNamedDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 22,
+          "offset": 22
+        }
+      },
+      "specifiers": [
+        {
+          "type": "ExportDefaultSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7,
+              "offset": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 10,
+              "offset": 10
+            }
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              },
+              "end": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              }
+            },
+            "name": "foo"
+          }
+        }
+      ],
+      "source": {
+        "type": "Literal",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 16,
+            "offset": 16
+          },
+          "end": {
+            "line": 1,
+            "column": 21,
+            "offset": 21
+          }
+        },
+        "value": "bar"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/actual.js
new file mode 100644
index 00000000000..0456afbad45
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/actual.js
@@ -0,0 +1 @@
+export default from "bar";
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/expected.ast
new file mode 100644
index 00000000000..2eca244d969
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/53/expected.ast
@@ -0,0 +1,82 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 26,
+      "offset": 26
+    }
+  },
+  "sourceType": "module",
+  "body": [
+    {
+      "type": "ExportNamedDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 26,
+          "offset": 26
+        }
+      },
+      "specifiers": [
+        {
+          "type": "ExportDefaultSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7,
+              "offset": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 14,
+              "offset": 14
+            }
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              },
+              "end": {
+                "line": 1,
+                "column": 14,
+                "offset": 14
+              }
+            },
+            "name": "default"
+          }
+        }
+      ],
+      "source": {
+        "type": "Literal",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 20,
+            "offset": 20
+          },
+          "end": {
+            "line": 1,
+            "column": 25,
+            "offset": 25
+          }
+        },
+        "value": "bar"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/actual.js
new file mode 100644
index 00000000000..0a52fa7a3e0
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/actual.js
@@ -0,0 +1 @@
+export * as foo from "bar";
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/expected.ast
new file mode 100644
index 00000000000..753b3189aa6
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/54/expected.ast
@@ -0,0 +1,82 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 27,
+      "offset": 27
+    }
+  },
+  "sourceType": "module",
+  "body": [
+    {
+      "type": "ExportNamedDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 27,
+          "offset": 27
+        }
+      },
+      "specifiers": [
+        {
+          "type": "ExportNamespaceSpecifier",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 7,
+              "offset": 7
+            },
+            "end": {
+              "line": 1,
+              "column": 15,
+              "offset": 15
+            }
+          },
+          "exported": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 12,
+                "offset": 12
+              },
+              "end": {
+                "line": 1,
+                "column": 15,
+                "offset": 15
+              }
+            },
+            "name": "foo"
+          }
+        }
+      ],
+      "source": {
+        "type": "Literal",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 21,
+            "offset": 21
+          },
+          "end": {
+            "line": 1,
+            "column": 26,
+            "offset": 26
+          }
+        },
+        "value": "bar"
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/actual.js
new file mode 100644
index 00000000000..693af539bf9
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/actual.js
@@ -0,0 +1,3 @@
+@decorate((arg) => null)
+class Ex {
+}
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/expected.ast
new file mode 100644
index 00000000000..06b6558b772
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/62/expected.ast
@@ -0,0 +1,167 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 4,
+      "column": 0,
+      "offset": 38
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "ClassDeclaration",
+      "loc": {
+        "start": {
+          "line": 2,
+          "column": 0,
+          "offset": 25
+        },
+        "end": {
+          "line": 3,
+          "column": 1,
+          "offset": 37
+        }
+      },
+      "decorators": [
+        {
+          "type": "Decorator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 24,
+              "offset": 24
+            }
+          },
+          "expression": {
+            "type": "CallExpression",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 24,
+                "offset": 24
+              }
+            },
+            "callee": {
+              "type": "Identifier",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1,
+                  "offset": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 9,
+                  "offset": 9
+                }
+              },
+              "name": "decorate"
+            },
+            "arguments": [
+              {
+                "type": "ArrowFunctionExpression",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 10,
+                    "offset": 10
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 23,
+                    "offset": 23
+                  }
+                },
+                "id": null,
+                "generator": false,
+                "expression": true,
+                "params": [
+                  {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 11,
+                        "offset": 11
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 14,
+                        "offset": 14
+                      }
+                    },
+                    "name": "arg"
+                  }
+                ],
+                "body": {
+                  "type": "Literal",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 19,
+                      "offset": 19
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 23,
+                      "offset": 23
+                    }
+                  }
+                }
+              }
+            ]
+          }
+        }
+      ],
+      "id": {
+        "type": "Identifier",
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 6,
+            "offset": 31
+          },
+          "end": {
+            "line": 2,
+            "column": 8,
+            "offset": 33
+          }
+        },
+        "name": "Ex"
+      },
+      "superClass": null,
+      "body": {
+        "type": "ClassBody",
+        "loc": {
+          "start": {
+            "line": 2,
+            "column": 9,
+            "offset": 34
+          },
+          "end": {
+            "line": 3,
+            "column": 1,
+            "offset": 37
+          }
+        },
+        "body": []
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/actual.js b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/actual.js
new file mode 100644
index 00000000000..44f43b4c072
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/actual.js
@@ -0,0 +1 @@
+let {...x} = z
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/expected.ast b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/expected.ast
new file mode 100644
index 00000000000..a47b30d80ca
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/experimental/uncategorised/9/expected.ast
@@ -0,0 +1,119 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 1,
+      "column": 14,
+      "offset": 14
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 14,
+          "offset": 14
+        }
+      },
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 1,
+              "column": 14,
+              "offset": 14
+            }
+          },
+          "id": {
+            "type": "ObjectPattern",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              }
+            },
+            "properties": [
+              {
+                "type": "Property",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  }
+                },
+                "key": null,
+                "value": {
+                  "type": "RestElement",
+                  "argument": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 8,
+                        "offset": 8
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 9,
+                        "offset": 9
+                      }
+                    },
+                    "name": "x"
+                  }
+                }
+              }
+            ]
+          },
+          "init": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 13,
+                "offset": 13
+              },
+              "end": {
+                "line": 1,
+                "column": 14,
+                "offset": 14
+              }
+            },
+            "name": "z"
+          }
+        }
+      ],
+      "kind": "let"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/generate-tests.patch b/javascript/extractor/parser-tests/babylon/generate-tests.patch
new file mode 100644
index 00000000000..463ba3226da
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/generate-tests.patch
@@ -0,0 +1,110 @@
+diff --git a/test/index.js b/test/index.js
+index efc6fe5..64d3ddf 100644
+--- a/test/index.js
++++ b/test/index.js
+@@ -60,6 +60,105 @@ function runTest(test) {
+       throw new Error(mis);
+     }
+   }
++
++  require("fs").writeFileSync(test.expect.loc.replace(/\.js(on)?$/, ".ast"),
++    JSON.stringify(ast, massage, 2));
++}
++
++function massage(k, v) {
++  if (v && typeof v === 'object') {
++    if (v.type === "File")
++      return massage(k, v.program);
++
++
++    if (v.type === "ObjectProperty")
++      v.type = "Property";
++
++    if (v.type === "NumericLiteral" || v.type === "StringLiteral" || v.type === "NullLiteral")
++      v.type = "Literal";
++
++    if (v.type === "RestProperty") {
++      v.type = "Property";
++      v.key = null;
++      v.value = {
++        type: "RestElement",
++        argument: v.argument
++      };
++      delete v.argument;
++    }
++
++    if (v.type === "SpreadProperty") {
++      v.type = "Property";
++      v.key = null;
++      v.value = {
++        type: "SpreadElement",
++        argument: v.argument
++      };
++      delete v.argument;
++    }
++
++    if (v.type === "ClassMethod") {
++      v.type = "MethodDefinition";
++      v.value = {
++        type: "FunctionExpression",
++        id: v.id,
++        generator: v.generator,
++        expression: v.expression,
++        async: v.async,
++        params: v.params,
++        body: v.body
++      };
++      delete v.id; delete v.generator; delete v.expression;
++      delete v.async; delete v.params; delete v.body;
++    }
++
++    if (v.type === "ObjectMethod") {
++      v.type = "Property";
++      v.kind = "init";
++      v.value = {
++        type: "FunctionExpression",
++        id: v.id,
++        generator: v.generator,
++        expression: v.expression,
++        async: v.async,
++        params: v.params,
++        body: v.body
++      };
++      delete v.id; delete v.generator; delete v.expression;
++      delete v.async; delete v.params; delete v.body;
++    }
++
++    if (v.type === "ClassProperty")
++      v.type = "FieldDefinition";
++
++    if (v.range) {
++      v.start = v.range[0];
++      v.end = v.range[1];
++      delete v.range;
++    }
++
++    if (typeof v.start === 'number') {
++      v.loc = v.loc || {};
++      v.loc.start = v.loc.start || {};
++      v.loc.start.offset = v.start;
++      delete v.start;
++    }
++
++    if (typeof v.end === 'number') {
++      v.loc = v.loc || {};
++      v.loc.end = v.loc.end || {};
++      v.loc.end.offset = v.end;
++      delete v.end;
++    }
++
++    delete v.directives;
++    delete v.extra;
++  }
++
++  if (v instanceof RegExp)
++    return v.toString();
++
++  return v;
+ }
+ 
+ function ppJSON(v) {
diff --git a/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/actual.js b/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/actual.js
new file mode 100644
index 00000000000..ebfe2a28165
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/actual.js
@@ -0,0 +1,3 @@
+var foo = ( { title, ...other } ) => {
+  
+};
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/expected.ast b/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/expected.ast
new file mode 100644
index 00000000000..13e014579c7
--- /dev/null
+++ b/javascript/extractor/parser-tests/babylon/harmony/arrow-functions/object-rest-spread/expected.ast
@@ -0,0 +1,205 @@
+{
+  "type": "Program",
+  "loc": {
+    "start": {
+      "line": 1,
+      "column": 0,
+      "offset": 0
+    },
+    "end": {
+      "line": 3,
+      "column": 2,
+      "offset": 44
+    }
+  },
+  "sourceType": "script",
+  "body": [
+    {
+      "type": "VariableDeclaration",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 3,
+          "column": 2,
+          "offset": 44
+        }
+      },
+      "declarations": [
+        {
+          "type": "VariableDeclarator",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 4,
+              "offset": 4
+            },
+            "end": {
+              "line": 3,
+              "column": 1,
+              "offset": 43
+            }
+          },
+          "id": {
+            "type": "Identifier",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              },
+              "end": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              }
+            },
+            "name": "foo"
+          },
+          "init": {
+            "type": "ArrowFunctionExpression",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              },
+              "end": {
+                "line": 3,
+                "column": 1,
+                "offset": 43
+              }
+            },
+            "id": null,
+            "generator": false,
+            "expression": false,
+            "params": [
+              {
+                "type": "ObjectPattern",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 12,
+                    "offset": 12
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 31,
+                    "offset": 31
+                  }
+                },
+                "properties": [
+                  {
+                    "type": "Property",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 14,
+                        "offset": 14
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 19,
+                        "offset": 19
+                      }
+                    },
+                    "method": false,
+                    "shorthand": true,
+                    "computed": false,
+                    "key": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 14,
+                          "offset": 14
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 19,
+                          "offset": 19
+                        }
+                      },
+                      "name": "title"
+                    },
+                    "value": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 14,
+                          "offset": 14
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 19,
+                          "offset": 19
+                        }
+                      },
+                      "name": "title"
+                    }
+                  },
+                  {
+                    "type": "Property",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 21,
+                        "offset": 21
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 29,
+                        "offset": 29
+                      }
+                    },
+                    "key": null,
+                    "value": {
+                      "type": "RestElement",
+                      "argument": {
+                        "type": "Identifier",
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 24,
+                            "offset": 24
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 29,
+                            "offset": 29
+                          }
+                        },
+                        "name": "other"
+                      }
+                    }
+                  }
+                ]
+              }
+            ],
+            "body": {
+              "type": "BlockStatement",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 37,
+                  "offset": 37
+                },
+                "end": {
+                  "line": 3,
+                  "column": 1,
+                  "offset": 43
+                }
+              },
+              "body": []
+            }
+          }
+        }
+      ],
+      "kind": "var"
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/README.md b/javascript/extractor/parser-tests/jcorn-jsx/README.md
new file mode 100644
index 00000000000..549ee2f1ad6
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/README.md
@@ -0,0 +1,3 @@
+These tests were semi-automatically generated from the [acorn-jsx test suite](https://github.com/RReverser/acorn-jsx/tree/master/test).
+
+For each test, `test<n>.js` is the input, `test<n>.options.json` are the parser options (if they are non-standard), `test<n>.ast` is the expected output pattern (if the test is meant to succeed), and `test<n>.fail` is the expected error message (if the test is meant to fail).
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/generate-tests.patch b/javascript/extractor/parser-tests/jcorn-jsx/generate-tests.patch
new file mode 100644
index 00000000000..960e490d825
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/generate-tests.patch
@@ -0,0 +1,61 @@
+diff --git a/test/driver.js b/test/driver.js
+index 06d5644..012184a 100644
+--- a/test/driver.js
++++ b/test/driver.js
+@@ -1,13 +1,53 @@
+ var tests = [];
++var ntests = 0;
++var fs = require("fs");
+ 
+ exports.test = function(code, ast, options) {
+-  tests.push({code: code, ast: ast, options: options});
++  var testName = "test" + (ntests++);
++  fs.writeFileSync(testName + ".js", code);
++  if (options && options.plugins && options.plugins.jsx)
++    fs.writeFileSync(testName + ".options.json", JSON.stringify(options.plugins.jsx, null, 2));
++  fs.writeFileSync(testName + ".ast", JSON.stringify(ast, function(k, v) {
++    if (v && typeof v === 'object') {
++      if (v.range) {
++        v.start = v.range[0];
++        v.end = v.range[1];
++        delete v.range;
++      }
++
++      if (typeof v.start === 'number') {
++        v.loc = v.loc || {};
++        v.loc.start = v.loc.start || {};
++        v.loc.start.offset = v.start;
++        delete v.start;
++      }
++
++      if (typeof v.end === 'number') {
++        v.loc = v.loc || {};
++        v.loc.end = v.loc.end || {};
++        v.loc.end.offset = v.end;
++        delete v.end;
++      }
++    }
++
++    if (v instanceof RegExp)
++      return v.toString();
++
++    return v;
++  }, 2));
++  //tests.push({code: code, ast: ast, options: options});
+ };
+ exports.testFail = function(code, message, options) {
+-  tests.push({code: code, error: message, options: options});
++  var testName = "test" + (ntests++);
++  fs.writeFileSync(testName + ".js", code);
++  if (options && options.plugins && options.plugins.jsx)
++    fs.writeFileSync(testName + ".options.json", JSON.stringify(options.plugins.jsx, null, 2));
++  fs.writeFileSync(testName + ".fail", message);
++//  tests.push({code: code, error: message, options: options});
+ };
+ exports.testAssert = function(code, assert, options) {
+-  tests.push({code: code, assert: assert, options: options});
++  throw new Error("Cannot handle tests with explicit assertions.");
++//  tests.push({code: code, assert: assert, options: options});
+ };
+ 
+ exports.runTests = function(config, callback) {
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test0.fail b/javascript/extractor/parser-tests/jcorn-jsx/test0.fail
new file mode 100644
index 00000000000..f5758a77b61
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test0.fail
@@ -0,0 +1 @@
+Adjacent JSX elements must be wrapped in an enclosing tag (1:22)
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test0.js b/javascript/extractor/parser-tests/jcorn-jsx/test0.js
new file mode 100644
index 00000000000..7f8c0f612b3
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test0.js
@@ -0,0 +1 @@
+var x = <div>one</div><div>two</div>;
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test1.fail b/javascript/extractor/parser-tests/jcorn-jsx/test1.fail
new file mode 100644
index 00000000000..20442f55e49
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test1.fail
@@ -0,0 +1 @@
+Unexpected token (1:4)
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test1.js b/javascript/extractor/parser-tests/jcorn-jsx/test1.js
new file mode 100644
index 00000000000..c4c33b266ec
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test1.js
@@ -0,0 +1 @@
+<a:b.c />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test10.ast b/javascript/extractor/parser-tests/jcorn-jsx/test10.ast
new file mode 100644
index 00000000000..62d0b3ea5ae
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test10.ast
@@ -0,0 +1,70 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 2,
+              "column": 2,
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 2,
+            "column": 2,
+            "offset": 5
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 2,
+          "column": 2,
+          "offset": 5
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test10.js b/javascript/extractor/parser-tests/jcorn-jsx/test10.js
new file mode 100644
index 00000000000..860471c4a4d
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test10.js
@@ -0,0 +1,2 @@
+<a
+/>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test11.ast b/javascript/extractor/parser-tests/jcorn-jsx/test11.ast
new file mode 100644
index 00000000000..5c4f134b3f4
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test11.ast
@@ -0,0 +1,100 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "日本語",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "日本語",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              },
+              "end": {
+                "line": 1,
+                "column": 10,
+                "offset": 10
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            },
+            "end": {
+              "line": 1,
+              "column": 11,
+              "offset": 11
+            }
+          }
+        },
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 11,
+            "offset": 11
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 11,
+          "offset": 11
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test11.js b/javascript/extractor/parser-tests/jcorn-jsx/test11.js
new file mode 100644
index 00000000000..91bb63a3586
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test11.js
@@ -0,0 +1 @@
+<日本語></日本語>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test12.ast b/javascript/extractor/parser-tests/jcorn-jsx/test12.ast
new file mode 100644
index 00000000000..e60fa8f3947
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test12.ast
@@ -0,0 +1,167 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "AbC-def",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 8,
+                "offset": 8
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "test",
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 2,
+                    "offset": 11
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 6,
+                    "offset": 15
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "&&",
+                "raw": "\"&#x0026;&#38;\"",
+                "loc": {
+                  "start": {
+                    "line": 2,
+                    "column": 7,
+                    "offset": 16
+                  },
+                  "end": {
+                    "line": 2,
+                    "column": 22,
+                    "offset": 31
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 2,
+                  "column": 2,
+                  "offset": 11
+                },
+                "end": {
+                  "line": 2,
+                  "column": 22,
+                  "offset": 31
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 2,
+              "column": 23,
+              "offset": 32
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "AbC-def",
+            "loc": {
+              "start": {
+                "line": 5,
+                "column": 2,
+                "offset": 43
+              },
+              "end": {
+                "line": 5,
+                "column": 9,
+                "offset": 50
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 5,
+              "column": 0,
+              "offset": 41
+            },
+            "end": {
+              "line": 5,
+              "column": 10,
+              "offset": 51
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "Literal",
+            "value": "\nbar\nbaz\n",
+            "raw": "\nbar\nbaz\n",
+            "loc": {
+              "start": {
+                "line": 2,
+                "column": 23,
+                "offset": 32
+              },
+              "end": {
+                "line": 5,
+                "column": 0,
+                "offset": 41
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 5,
+            "column": 10,
+            "offset": 51
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 5,
+          "column": 10,
+          "offset": 51
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test12.js b/javascript/extractor/parser-tests/jcorn-jsx/test12.js
new file mode 100644
index 00000000000..edd14923135
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test12.js
@@ -0,0 +1,5 @@
+<AbC-def
+  test="&#x0026;&#38;">
+bar
+baz
+</AbC-def>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test13.ast b/javascript/extractor/parser-tests/jcorn-jsx/test13.ast
new file mode 100644
index 00000000000..97689d596c5
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test13.ast
@@ -0,0 +1,248 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "b",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 3,
+                    "offset": 3
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 4,
+                    "offset": 4
+                  }
+                }
+              },
+              "value": {
+                "type": "JSXExpressionContainer",
+                "expression": {
+                  "type": "ConditionalExpression",
+                  "test": {
+                    "type": "Identifier",
+                    "name": "x",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 6,
+                        "offset": 6
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 7,
+                        "offset": 7
+                      }
+                    }
+                  },
+                  "consequent": {
+                    "type": "JSXElement",
+                    "openingElement": {
+                      "type": "JSXOpeningElement",
+                      "name": {
+                        "type": "JSXIdentifier",
+                        "name": "c",
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 11,
+                            "offset": 11
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 12,
+                            "offset": 12
+                          }
+                        }
+                      },
+                      "selfClosing": true,
+                      "attributes": [],
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 10,
+                          "offset": 10
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 15,
+                          "offset": 15
+                        }
+                      }
+                    },
+                    "closingElement": null,
+                    "children": [],
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 10,
+                        "offset": 10
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 15,
+                        "offset": 15
+                      }
+                    }
+                  },
+                  "alternate": {
+                    "type": "JSXElement",
+                    "openingElement": {
+                      "type": "JSXOpeningElement",
+                      "name": {
+                        "type": "JSXIdentifier",
+                        "name": "d",
+                        "loc": {
+                          "start": {
+                            "line": 1,
+                            "column": 19,
+                            "offset": 19
+                          },
+                          "end": {
+                            "line": 1,
+                            "column": 20,
+                            "offset": 20
+                          }
+                        }
+                      },
+                      "selfClosing": true,
+                      "attributes": [],
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 18,
+                          "offset": 18
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 23,
+                          "offset": 23
+                        }
+                      }
+                    },
+                    "closingElement": null,
+                    "children": [],
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 18,
+                        "offset": 18
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 23,
+                        "offset": 23
+                      }
+                    }
+                  },
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 6,
+                      "offset": 6
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 23,
+                      "offset": 23
+                    }
+                  }
+                },
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 24,
+                    "offset": 24
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 3,
+                  "offset": 3
+                },
+                "end": {
+                  "line": 1,
+                  "column": 24,
+                  "offset": 24
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 27,
+              "offset": 27
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 27,
+            "offset": 27
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 27,
+          "offset": 27
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test13.js b/javascript/extractor/parser-tests/jcorn-jsx/test13.js
new file mode 100644
index 00000000000..946985a64c3
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test13.js
@@ -0,0 +1 @@
+<a b={x ? <c /> : <d />} />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test14.ast b/javascript/extractor/parser-tests/jcorn-jsx/test14.ast
new file mode 100644
index 00000000000..8b95f9427ea
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test14.ast
@@ -0,0 +1,131 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 3,
+              "offset": 3
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 7,
+                "offset": 7
+              },
+              "end": {
+                "line": 1,
+                "column": 8,
+                "offset": 8
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            },
+            "end": {
+              "line": 1,
+              "column": 9,
+              "offset": 9
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "JSXEmptyExpression",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4,
+                  "offset": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 4,
+                  "offset": 4
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 3,
+                "offset": 3
+              },
+              "end": {
+                "line": 1,
+                "column": 5,
+                "offset": 5
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 9,
+            "offset": 9
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 9,
+          "offset": 9
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test14.js b/javascript/extractor/parser-tests/jcorn-jsx/test14.js
new file mode 100644
index 00000000000..b5791d7653e
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test14.js
@@ -0,0 +1 @@
+<a>{}</a>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test15.ast b/javascript/extractor/parser-tests/jcorn-jsx/test15.ast
new file mode 100644
index 00000000000..0d0c40d8ea1
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test15.ast
@@ -0,0 +1,131 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 3,
+              "offset": 3
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 30,
+                "offset": 30
+              },
+              "end": {
+                "line": 1,
+                "column": 31,
+                "offset": 31
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 28,
+              "offset": 28
+            },
+            "end": {
+              "line": 1,
+              "column": 32,
+              "offset": 32
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "JSXEmptyExpression",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 4,
+                  "offset": 4
+                },
+                "end": {
+                  "line": 1,
+                  "column": 27,
+                  "offset": 27
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 3,
+                "offset": 3
+              },
+              "end": {
+                "line": 1,
+                "column": 28,
+                "offset": 28
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 32,
+            "offset": 32
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 32,
+          "offset": 32
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test15.js b/javascript/extractor/parser-tests/jcorn-jsx/test15.js
new file mode 100644
index 00000000000..10755e1d9d8
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test15.js
@@ -0,0 +1 @@
+<a>{/* this is a comment */}</a>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test16.ast b/javascript/extractor/parser-tests/jcorn-jsx/test16.ast
new file mode 100644
index 00000000000..549696e3e40
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test16.ast
@@ -0,0 +1,118 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 20,
+                "offset": 20
+              },
+              "end": {
+                "line": 1,
+                "column": 23,
+                "offset": 23
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 18,
+              "offset": 18
+            },
+            "end": {
+              "line": 1,
+              "column": 24,
+              "offset": 24
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "Literal",
+            "value": "@test content",
+            "raw": "@test content",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5,
+                "offset": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 18,
+                "offset": 18
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 24,
+            "offset": 24
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 24,
+          "offset": 24
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test16.js b/javascript/extractor/parser-tests/jcorn-jsx/test16.js
new file mode 100644
index 00000000000..ee309a93d2c
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test16.js
@@ -0,0 +1 @@
+<div>@test content</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test17.ast b/javascript/extractor/parser-tests/jcorn-jsx/test17.ast
new file mode 100644
index 00000000000..46a77702862
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test17.ast
@@ -0,0 +1,168 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 37,
+                "offset": 37
+              },
+              "end": {
+                "line": 1,
+                "column": 40,
+                "offset": 40
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 35,
+              "offset": 35
+            },
+            "end": {
+              "line": 1,
+              "column": 41,
+              "offset": 41
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXElement",
+            "openingElement": {
+              "type": "JSXOpeningElement",
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+              }
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+          },
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+            "value": "7x invalid-js-identifier",
+            "raw": "7x invalid-js-identifier",
+            "loc": {
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+                "column": 11,
+                "offset": 11
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+          "offset": 0
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+        }
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+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test17.js b/javascript/extractor/parser-tests/jcorn-jsx/test17.js
new file mode 100644
index 00000000000..f14dfe6f8b6
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test17.js
@@ -0,0 +1 @@
+<div><br />7x invalid-js-identifier</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test18.ast b/javascript/extractor/parser-tests/jcorn-jsx/test18.ast
new file mode 100644
index 00000000000..04c888bda4f
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test18.ast
@@ -0,0 +1,281 @@
+{
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+          "attributes": [
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+                  "attributes": [],
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+                      "offset": 31
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+                "closingElement": {
+                  "type": "JSXClosingElement",
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+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test18.js b/javascript/extractor/parser-tests/jcorn-jsx/test18.js
new file mode 100644
index 00000000000..f7525a0e00c
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test18.js
@@ -0,0 +1 @@
+<LeftRight left=<a /> right=<b>monkeys /> gorillas</b> />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test19.ast b/javascript/extractor/parser-tests/jcorn-jsx/test19.ast
new file mode 100644
index 00000000000..3bb04ef916c
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test19.ast
@@ -0,0 +1,162 @@
+{
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+          "name": {
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+            "offset": 11
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+      },
+      "loc": {
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+          "column": 0,
+          "offset": 0
+        },
+        "end": {
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+          "offset": 11
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test19.js b/javascript/extractor/parser-tests/jcorn-jsx/test19.js
new file mode 100644
index 00000000000..6869b9b3701
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test19.js
@@ -0,0 +1 @@
+<a.b></a.b>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test2.ast b/javascript/extractor/parser-tests/jcorn-jsx/test2.ast
new file mode 100644
index 00000000000..7ccb8266cce
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test2.ast
@@ -0,0 +1,108 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXMemberExpression",
+            "object": {
+              "type": "JSXNamespacedName",
+              "namespace": {
+                "type": "JSXIdentifier",
+                "name": "a",
+                "loc": {
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+                  "end": {
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+              "loc": {
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+            "property": {
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+                "end": {
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+            "loc": {
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+              "end": {
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+              }
+            }
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+          "loc": {
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+        "children": [],
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+      "loc": {
+        "start": {
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+        },
+        "end": {
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+        }
+      }
+    }
+  ],
+  "loc": {
+    "start": {
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+    },
+    "end": {
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+    }
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test2.js b/javascript/extractor/parser-tests/jcorn-jsx/test2.js
new file mode 100644
index 00000000000..c4c33b266ec
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test2.js
@@ -0,0 +1 @@
+<a:b.c />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test2.options.json b/javascript/extractor/parser-tests/jcorn-jsx/test2.options.json
new file mode 100644
index 00000000000..06a716ad2dd
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test2.options.json
@@ -0,0 +1,3 @@
+{
+  "allowNamespacedObjects": true
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test20.ast b/javascript/extractor/parser-tests/jcorn-jsx/test20.ast
new file mode 100644
index 00000000000..f96d197033d
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test20.ast
@@ -0,0 +1,224 @@
+{
+  "type": "Program",
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+      "expression": {
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+          "name": {
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+            "object": {
+              "type": "JSXMemberExpression",
+              "object": {
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+                "name": "a",
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+        "end": {
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+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test20.js b/javascript/extractor/parser-tests/jcorn-jsx/test20.js
new file mode 100644
index 00000000000..7a7ec287120
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test20.js
@@ -0,0 +1 @@
+<a.b.c></a.b.c>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test21.ast b/javascript/extractor/parser-tests/jcorn-jsx/test21.ast
new file mode 100644
index 00000000000..877c3d1fe73
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test21.ast
@@ -0,0 +1,102 @@
+{
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+  "body": [
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+      "expression": {
+        "type": "BinaryExpression",
+        "operator": "<",
+        "left": {
+          "type": "JSXElement",
+          "openingElement": {
+            "type": "JSXOpeningElement",
+            "name": {
+              "type": "JSXIdentifier",
+              "name": "div",
+              "loc": {
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+                  "column": 2,
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+                },
+                "end": {
+                  "line": 1,
+                  "column": 5,
+                  "offset": 5
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+            "selfClosing": true,
+            "attributes": [],
+            "loc": {
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+                "column": 1,
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+          "children": [],
+          "loc": {
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+              "column": 8,
+              "offset": 8
+            }
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+        "right": {
+          "type": "Identifier",
+          "name": "x",
+          "loc": {
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+              "column": 12,
+              "offset": 12
+            },
+            "end": {
+              "line": 1,
+              "column": 13,
+              "offset": 13
+            }
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+        },
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 13,
+            "offset": 13
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 14,
+          "offset": 14
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test21.js b/javascript/extractor/parser-tests/jcorn-jsx/test21.js
new file mode 100644
index 00000000000..d2b62355252
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test21.js
@@ -0,0 +1 @@
+(<div />) < x;
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test22.ast b/javascript/extractor/parser-tests/jcorn-jsx/test22.ast
new file mode 100644
index 00000000000..3415e997820
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test22.ast
@@ -0,0 +1,102 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [
+            {
+              "type": "JSXSpreadAttribute",
+              "argument": {
+                "type": "Identifier",
+                "name": "props",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  },
+                  "end": {
+                    "line": 1,
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+                    "offset": 14
+                  }
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+              "offset": 0
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+            "end": {
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+              "offset": 18
+            }
+          }
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+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
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+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 18,
+            "offset": 18
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 18,
+          "offset": 18
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test22.js b/javascript/extractor/parser-tests/jcorn-jsx/test22.js
new file mode 100644
index 00000000000..cf6e594c5ba
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test22.js
@@ -0,0 +1 @@
+<div {...props} />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test23.ast b/javascript/extractor/parser-tests/jcorn-jsx/test23.ast
new file mode 100644
index 00000000000..af929e21821
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test23.ast
@@ -0,0 +1,150 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [
+            {
+              "type": "JSXSpreadAttribute",
+              "argument": {
+                "type": "Identifier",
+                "name": "props",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 14,
+                    "offset": 14
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5,
+                  "offset": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 15,
+                  "offset": 15
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "post",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 16,
+                    "offset": 16
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 20,
+                    "offset": 20
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "attribute",
+                "raw": "\"attribute\"",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 21,
+                    "offset": 21
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 32,
+                    "offset": 32
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 16,
+                  "offset": 16
+                },
+                "end": {
+                  "line": 1,
+                  "column": 32,
+                  "offset": 32
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 35,
+              "offset": 35
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 35,
+            "offset": 35
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 35,
+          "offset": 35
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test23.js b/javascript/extractor/parser-tests/jcorn-jsx/test23.js
new file mode 100644
index 00000000000..2433a195ef3
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test23.js
@@ -0,0 +1 @@
+<div {...props} post="attribute" />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test24.ast b/javascript/extractor/parser-tests/jcorn-jsx/test24.ast
new file mode 100644
index 00000000000..b6673f1ce51
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test24.ast
@@ -0,0 +1,228 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "pre",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 8,
+                    "offset": 8
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "leading",
+                "raw": "\"leading\"",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 18,
+                    "offset": 18
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 5,
+                  "offset": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 18,
+                  "offset": 18
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "pre2",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 19,
+                    "offset": 19
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 23,
+                    "offset": 23
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "attribute",
+                "raw": "\"attribute\"",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 24,
+                    "offset": 24
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 35,
+                    "offset": 35
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 19,
+                  "offset": 19
+                },
+                "end": {
+                  "line": 1,
+                  "column": 35,
+                  "offset": 35
+                }
+              }
+            },
+            {
+              "type": "JSXSpreadAttribute",
+              "argument": {
+                "type": "Identifier",
+                "name": "props",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 40,
+                    "offset": 40
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 45,
+                    "offset": 45
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 36,
+                  "offset": 36
+                },
+                "end": {
+                  "line": 1,
+                  "column": 46,
+                  "offset": 46
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 47,
+              "offset": 47
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 49,
+                "offset": 49
+              },
+              "end": {
+                "line": 1,
+                "column": 52,
+                "offset": 52
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 47,
+              "offset": 47
+            },
+            "end": {
+              "line": 1,
+              "column": 53,
+              "offset": 53
+            }
+          }
+        },
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 53,
+            "offset": 53
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 53,
+          "offset": 53
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test24.js b/javascript/extractor/parser-tests/jcorn-jsx/test24.js
new file mode 100644
index 00000000000..db9fd5598d4
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test24.js
@@ -0,0 +1 @@
+<div pre="leading" pre2="attribute" {...props}></div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test25.ast b/javascript/extractor/parser-tests/jcorn-jsx/test25.ast
new file mode 100644
index 00000000000..663a51b4c50
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test25.ast
@@ -0,0 +1,498 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 52,
+          "offset": 52
+        }
+      },
+      "expression": {
+        "type": "JSXElement",
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 52,
+            "offset": 52
+          }
+        },
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 31,
+              "offset": 31
+            }
+          },
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 3,
+                  "offset": 3
+                },
+                "end": {
+                  "line": 1,
+                  "column": 16,
+                  "offset": 16
+                }
+              },
+              "name": {
+                "type": "JSXIdentifier",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 3,
+                    "offset": 3
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  }
+                },
+                "name": "aa"
+              },
+              "value": {
+                "type": "JSXExpressionContainer",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 6,
+                    "offset": 6
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 16,
+                    "offset": 16
+                  }
+                },
+                "expression": {
+                  "type": "MemberExpression",
+                  "loc": {
+                    "start": {
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+                      "offset": 7
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+                    "end": {
+                      "line": 1,
+                      "column": 15,
+                      "offset": 15
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+                  },
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+                    "type": "MemberExpression",
+                    "loc": {
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+                      },
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+                        "line": 1,
+                        "column": 12,
+                        "offset": 12
+                      }
+                    },
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+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 7,
+                          "offset": 7
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 9,
+                          "offset": 9
+                        }
+                      },
+                      "name": "aa"
+                    },
+                    "property": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
+                          "column": 10,
+                          "offset": 10
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 12,
+                          "offset": 12
+                        }
+                      },
+                      "name": "bb"
+                    },
+                    "computed": false
+                  },
+                  "property": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 13,
+                        "offset": 13
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 15,
+                        "offset": 15
+                      }
+                    },
+                    "name": "cc"
+                  },
+                  "computed": false
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 17,
+                  "offset": 17
+                },
+                "end": {
+                  "line": 1,
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+                  "offset": 30
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+              "name": {
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+                    "offset": 19
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+                "name": "bb"
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+              "value": {
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+                  "end": {
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+                  "type": "MemberExpression",
+                  "loc": {
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+                    "end": {
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+                      "column": 29,
+                      "offset": 29
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+                  "object": {
+                    "type": "MemberExpression",
+                    "loc": {
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+                        "column": 21,
+                        "offset": 21
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+                      "end": {
+                        "line": 1,
+                        "column": 26,
+                        "offset": 26
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+                    },
+                    "object": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
+                          "line": 1,
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+                          "offset": 21
+                        },
+                        "end": {
+                          "line": 1,
+                          "column": 23,
+                          "offset": 23
+                        }
+                      },
+                      "name": "bb"
+                    },
+                    "property": {
+                      "type": "Identifier",
+                      "loc": {
+                        "start": {
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+                          "column": 24,
+                          "offset": 24
+                        },
+                        "end": {
+                          "line": 1,
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+                  "computed": false
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+          "name": {
+            "type": "JSXIdentifier",
+            "loc": {
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+                "column": 1,
+                "offset": 1
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+                "column": 2,
+                "offset": 2
+              }
+            },
+            "name": "A"
+          },
+          "selfClosing": false
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "loc": {
+            "start": {
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+              "offset": 48
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+            "end": {
+              "line": 1,
+              "column": 52,
+              "offset": 52
+            }
+          },
+          "name": {
+            "type": "JSXIdentifier",
+            "loc": {
+              "start": {
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+                "column": 50,
+                "offset": 50
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+              "end": {
+                "line": 1,
+                "column": 51,
+                "offset": 51
+              }
+            },
+            "name": "A"
+          }
+        },
+        "children": [
+          {
+            "type": "JSXElement",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 31,
+                "offset": 31
+              },
+              "end": {
+                "line": 1,
+                "column": 48,
+                "offset": 48
+              }
+            },
+            "openingElement": {
+              "type": "JSXOpeningElement",
+              "loc": {
+                "start": {
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+                  "column": 31,
+                  "offset": 31
+                },
+                "end": {
+                  "line": 1,
+                  "column": 36,
+                  "offset": 36
+                }
+              },
+              "attributes": [],
+              "name": {
+                "type": "JSXIdentifier",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 32,
+                    "offset": 32
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 35,
+                    "offset": 35
+                  }
+                },
+                "name": "div"
+              },
+              "selfClosing": false
+            },
+            "closingElement": {
+              "type": "JSXClosingElement",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 42,
+                  "offset": 42
+                },
+                "end": {
+                  "line": 1,
+                  "column": 48,
+                  "offset": 48
+                }
+              },
+              "name": {
+                "type": "JSXIdentifier",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 44,
+                    "offset": 44
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 47,
+                    "offset": 47
+                  }
+                },
+                "name": "div"
+              }
+            },
+            "children": [
+              {
+                "type": "JSXExpressionContainer",
+                "loc": {
+                  "start": {
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+                    "column": 36,
+                    "offset": 36
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 42,
+                    "offset": 42
+                  }
+                },
+                "expression": {
+                  "type": "MemberExpression",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 37,
+                      "offset": 37
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 41,
+                      "offset": 41
+                    }
+                  },
+                  "object": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 37,
+                        "offset": 37
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 39,
+                        "offset": 39
+                      }
+                    },
+                    "name": "aa"
+                  },
+                  "property": {
+                    "type": "Identifier",
+                    "loc": {
+                      "start": {
+                        "line": 1,
+                        "column": 40,
+                        "offset": 40
+                      },
+                      "end": {
+                        "line": 1,
+                        "column": 41,
+                        "offset": 41
+                      }
+                    },
+                    "name": "b"
+                  },
+                  "computed": false
+                }
+              }
+            ]
+          }
+        ]
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test25.js b/javascript/extractor/parser-tests/jcorn-jsx/test25.js
new file mode 100644
index 00000000000..5ad7edf2bce
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test25.js
@@ -0,0 +1 @@
+<A aa={aa.bb.cc} bb={bb.cc.dd}><div>{aa.b}</div></A>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test26.ast b/javascript/extractor/parser-tests/jcorn-jsx/test26.ast
new file mode 100644
index 00000000000..ea7b33780e3
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test26.ast
@@ -0,0 +1,214 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "p",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": false,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 3
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "p",
+            "loc": {
+              "start": {
+                "offset": 36
+              },
+              "end": {
+                "offset": 37
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "offset": 34
+            },
+            "end": {
+              "offset": 38
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "Literal",
+            "value": "foo ",
+            "raw": "foo ",
+            "loc": {
+              "start": {
+                "offset": 3
+              },
+              "end": {
+                "offset": 7
+              }
+            }
+          },
+          {
+            "type": "JSXElement",
+            "openingElement": {
+              "type": "JSXOpeningElement",
+              "attributes": [
+                {
+                  "type": "JSXAttribute",
+                  "name": {
+                    "type": "JSXIdentifier",
+                    "name": "href",
+                    "loc": {
+                      "start": {
+                        "offset": 10
+                      },
+                      "end": {
+                        "offset": 14
+                      }
+                    }
+                  },
+                  "value": {
+                    "type": "Literal",
+                    "value": "test",
+                    "raw": "\"test\"",
+                    "loc": {
+                      "start": {
+                        "offset": 15
+                      },
+                      "end": {
+                        "offset": 21
+                      }
+                    }
+                  },
+                  "loc": {
+                    "start": {
+                      "offset": 10
+                    },
+                    "end": {
+                      "offset": 21
+                    }
+                  }
+                }
+              ],
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "a",
+                "loc": {
+                  "start": {
+                    "offset": 8
+                  },
+                  "end": {
+                    "offset": 9
+                  }
+                }
+              },
+              "selfClosing": false,
+              "loc": {
+                "start": {
+                  "offset": 7
+                },
+                "end": {
+                  "offset": 22
+                }
+              }
+            },
+            "closingElement": {
+              "type": "JSXClosingElement",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "a",
+                "loc": {
+                  "start": {
+                    "offset": 28
+                  },
+                  "end": {
+                    "offset": 29
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 26
+                },
+                "end": {
+                  "offset": 30
+                }
+              }
+            },
+            "children": [
+              {
+                "type": "Literal",
+                "value": " bar",
+                "raw": " bar",
+                "loc": {
+                  "start": {
+                    "offset": 22
+                  },
+                  "end": {
+                    "offset": 26
+                  }
+                }
+              }
+            ],
+            "loc": {
+              "start": {
+                "offset": 7
+              },
+              "end": {
+                "offset": 30
+              }
+            }
+          },
+          {
+            "type": "Literal",
+            "value": " baz",
+            "raw": " baz",
+            "loc": {
+              "start": {
+                "offset": 30
+              },
+              "end": {
+                "offset": 34
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 38
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 40
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test26.js b/javascript/extractor/parser-tests/jcorn-jsx/test26.js
new file mode 100644
index 00000000000..49bad1a3151
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test26.js
@@ -0,0 +1 @@
+<p>foo <a href="test"> bar</a> baz</p> ;
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test27.ast b/javascript/extractor/parser-tests/jcorn-jsx/test27.ast
new file mode 100644
index 00000000000..81950d3ed09
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test27.ast
@@ -0,0 +1,150 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 26
+              },
+              "end": {
+                "offset": 29
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "offset": 24
+            },
+            "end": {
+              "offset": 30
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "JSXElement",
+              "openingElement": {
+                "type": "JSXOpeningElement",
+                "attributes": [
+                  {
+                    "type": "JSXSpreadAttribute",
+                    "argument": {
+                      "type": "Identifier",
+                      "name": "test",
+                      "loc": {
+                        "start": {
+                          "offset": 15
+                        },
+                        "end": {
+                          "offset": 19
+                        }
+                      }
+                    },
+                    "loc": {
+                      "start": {
+                        "offset": 11
+                      },
+                      "end": {
+                        "offset": 20
+                      }
+                    }
+                  }
+                ],
+                "name": {
+                  "type": "JSXIdentifier",
+                  "name": "div",
+                  "loc": {
+                    "start": {
+                      "offset": 7
+                    },
+                    "end": {
+                      "offset": 10
+                    }
+                  }
+                },
+                "selfClosing": true,
+                "loc": {
+                  "start": {
+                    "offset": 6
+                  },
+                  "end": {
+                    "offset": 23
+                  }
+                }
+              },
+              "closingElement": null,
+              "children": [],
+              "loc": {
+                "start": {
+                  "offset": 6
+                },
+                "end": {
+                  "offset": 23
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "offset": 5
+              },
+              "end": {
+                "offset": 24
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 30
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 30
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test27.js b/javascript/extractor/parser-tests/jcorn-jsx/test27.js
new file mode 100644
index 00000000000..7c6ab997542
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test27.js
@@ -0,0 +1 @@
+<div>{<div {...test} />}</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test28.ast b/javascript/extractor/parser-tests/jcorn-jsx/test28.ast
new file mode 100644
index 00000000000..cb0a8cbfd58
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test28.ast
@@ -0,0 +1,140 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 14
+              },
+              "end": {
+                "offset": 17
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "offset": 12
+            },
+            "end": {
+              "offset": 18
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "ObjectExpression",
+              "properties": [
+                {
+                  "type": "Property",
+                  "method": false,
+                  "shorthand": true,
+                  "computed": false,
+                  "key": {
+                    "type": "Identifier",
+                    "name": "a",
+                    "loc": {
+                      "start": {
+                        "offset": 8
+                      },
+                      "end": {
+                        "offset": 9
+                      }
+                    }
+                  },
+                  "kind": "init",
+                  "value": {
+                    "type": "Identifier",
+                    "name": "a",
+                    "loc": {
+                      "start": {
+                        "offset": 8
+                      },
+                      "end": {
+                        "offset": 9
+                      }
+                    }
+                  },
+                  "loc": {
+                    "start": {
+                      "offset": 8
+                    },
+                    "end": {
+                      "offset": 9
+                    }
+                  }
+                }
+              ],
+              "loc": {
+                "start": {
+                  "offset": 7
+                },
+                "end": {
+                  "offset": 10
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "offset": 5
+              },
+              "end": {
+                "offset": 12
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 18
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 18
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test28.js b/javascript/extractor/parser-tests/jcorn-jsx/test28.js
new file mode 100644
index 00000000000..a363c43740e
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test28.js
@@ -0,0 +1 @@
+<div>{ {a} }</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test29.ast b/javascript/extractor/parser-tests/jcorn-jsx/test29.ast
new file mode 100644
index 00000000000..1ab2f9f175d
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test29.ast
@@ -0,0 +1,90 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 12
+              },
+              "end": {
+                "offset": 15
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "offset": 10
+            },
+            "end": {
+              "offset": 16
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "Literal",
+            "value": "/text",
+            "raw": "/text",
+            "loc": {
+              "start": {
+                "offset": 5
+              },
+              "end": {
+                "offset": 10
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 16
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 16
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test29.js b/javascript/extractor/parser-tests/jcorn-jsx/test29.js
new file mode 100644
index 00000000000..c9aae5b876f
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test29.js
@@ -0,0 +1 @@
+<div>/text</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test3.fail b/javascript/extractor/parser-tests/jcorn-jsx/test3.fail
new file mode 100644
index 00000000000..941a0ccde0e
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test3.fail
@@ -0,0 +1 @@
+Unexpected token (1:3)
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test3.js b/javascript/extractor/parser-tests/jcorn-jsx/test3.js
new file mode 100644
index 00000000000..625c525413b
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test3.js
@@ -0,0 +1 @@
+<ns:div />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test3.options.json b/javascript/extractor/parser-tests/jcorn-jsx/test3.options.json
new file mode 100644
index 00000000000..05026610ef5
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test3.options.json
@@ -0,0 +1,3 @@
+{
+  "allowNamespaces": false
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test30.ast b/javascript/extractor/parser-tests/jcorn-jsx/test30.ast
new file mode 100644
index 00000000000..85170abbc4c
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test30.ast
@@ -0,0 +1,139 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": false,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 13
+              },
+              "end": {
+                "offset": 16
+              }
+            }
+          },
+          "loc": {
+            "start": {
+              "offset": 11
+            },
+            "end": {
+              "offset": 17
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "Identifier",
+              "name": "a",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 6,
+                  "offset": 6
+                },
+                "end": {
+                  "line": 1,
+                  "column": 7,
+                  "offset": 7
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 5,
+                "offset": 5
+              },
+              "end": {
+                "line": 1,
+                "column": 8,
+                "offset": 8
+              }
+            }
+          },
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "Identifier",
+              "name": "b",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 9,
+                  "offset": 9
+                },
+                "end": {
+                  "line": 1,
+                  "column": 10,
+                  "offset": 10
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 8,
+                "offset": 8
+              },
+              "end": {
+                "line": 1,
+                "column": 11,
+                "offset": 11
+              }
+            }
+          }
+        ],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 17
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 17
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test30.js b/javascript/extractor/parser-tests/jcorn-jsx/test30.js
new file mode 100644
index 00000000000..8901087ff83
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test30.js
@@ -0,0 +1 @@
+<div>{a}{b}</div>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test31.ast b/javascript/extractor/parser-tests/jcorn-jsx/test31.ast
new file mode 100644
index 00000000000..9cb660b580e
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test31.ast
@@ -0,0 +1,113 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "pre",
+                "loc": {
+                  "start": {
+                    "offset": 5
+                  },
+                  "end": {
+                    "offset": 8
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "leading",
+                "loc": {
+                  "start": {
+                    "offset": 9
+                  },
+                  "end": {
+                    "offset": 18
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 5
+                },
+                "end": {
+                  "offset": 18
+                }
+              }
+            },
+            {
+              "type": "JSXSpreadAttribute",
+              "argument": {
+                "type": "Identifier",
+                "name": "props",
+                "loc": {
+                  "start": {
+                    "offset": 23
+                  },
+                  "end": {
+                    "offset": 28
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 19
+                },
+                "end": {
+                  "offset": 29
+                }
+              }
+            }
+          ],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "div",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": true,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 32
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 32
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 32
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test31.js b/javascript/extractor/parser-tests/jcorn-jsx/test31.js
new file mode 100644
index 00000000000..2d3ea96f9d7
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test31.js
@@ -0,0 +1 @@
+<div pre="leading" {...props} />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test32.ast b/javascript/extractor/parser-tests/jcorn-jsx/test32.ast
new file mode 100644
index 00000000000..26636973e04
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test32.ast
@@ -0,0 +1,87 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "d",
+                "loc": {
+                  "start": {
+                    "offset": 6
+                  },
+                  "end": {
+                    "offset": 7
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 8,
+                    "offset": 8
+                  },
+                  "end": {
+                    "line": 3,
+                    "column": 15,
+                    "offset": 61
+                  }
+                },
+                "value": "M230 80\n\t\tA 45 45, 0, 1, 0, 275 125 \n    L 275 80 Z",
+                "raw": "\"M230 80\n\t\tA 45 45, 0, 1, 0, 275 125 \n    L 275 80 Z\""
+              },
+              "loc": {
+                "start": {
+                  "offset": 6
+                },
+                "end": {
+                  "offset": 61
+                }
+              }
+            }
+          ],
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "path",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 5
+              }
+            }
+          },
+          "selfClosing": true,
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 63
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 63
+          }
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test32.js b/javascript/extractor/parser-tests/jcorn-jsx/test32.js
new file mode 100644
index 00000000000..3d5ffc59b41
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test32.js
@@ -0,0 +1,3 @@
+<path d="M230 80
+		A 45 45, 0, 1, 0, 275 125 
+    L 275 80 Z"/>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test4.fail b/javascript/extractor/parser-tests/jcorn-jsx/test4.fail
new file mode 100644
index 00000000000..a1010e7bbec
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test4.fail
@@ -0,0 +1 @@
+Unexpected token (1:7)
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test4.js b/javascript/extractor/parser-tests/jcorn-jsx/test4.js
new file mode 100644
index 00000000000..732c2ce2ea5
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test4.js
@@ -0,0 +1 @@
+<div ns:attr />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test4.options.json b/javascript/extractor/parser-tests/jcorn-jsx/test4.options.json
new file mode 100644
index 00000000000..05026610ef5
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test4.options.json
@@ -0,0 +1,3 @@
+{
+  "allowNamespaces": false
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test5.ast b/javascript/extractor/parser-tests/jcorn-jsx/test5.ast
new file mode 100644
index 00000000000..9e26dfeeb6e
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test5.ast
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test5.js b/javascript/extractor/parser-tests/jcorn-jsx/test5.js
new file mode 100644
index 00000000000..bf2cee5e8f8
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test5.js
@@ -0,0 +1 @@
+<a>{/* foo */}</a>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test6.ast b/javascript/extractor/parser-tests/jcorn-jsx/test6.ast
new file mode 100644
index 00000000000..4b3d9f57666
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test6.ast
@@ -0,0 +1,70 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 5,
+              "offset": 5
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 5,
+            "offset": 5
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 5,
+          "offset": 5
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test6.js b/javascript/extractor/parser-tests/jcorn-jsx/test6.js
new file mode 100644
index 00000000000..4a122352180
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test6.js
@@ -0,0 +1 @@
+<a />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test7.ast b/javascript/extractor/parser-tests/jcorn-jsx/test7.ast
new file mode 100644
index 00000000000..6dfd1856702
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test7.ast
@@ -0,0 +1,165 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXNamespacedName",
+            "namespace": {
+              "type": "JSXIdentifier",
+              "name": "n",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 1,
+                  "offset": 1
+                },
+                "end": {
+                  "line": 1,
+                  "column": 2,
+                  "offset": 2
+                }
+              }
+            },
+            "name": {
+              "type": "JSXIdentifier",
+              "name": "a",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 3,
+                  "offset": 3
+                },
+                "end": {
+                  "line": 1,
+                  "column": 4,
+                  "offset": 4
+                }
+              }
+            },
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 4,
+                "offset": 4
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXNamespacedName",
+                "namespace": {
+                  "type": "JSXIdentifier",
+                  "name": "n",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 5,
+                      "offset": 5
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 6,
+                      "offset": 6
+                    }
+                  }
+                },
+                "name": {
+                  "type": "JSXIdentifier",
+                  "name": "v",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 7,
+                      "offset": 7
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 8,
+                      "offset": 8
+                    }
+                  }
+                },
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 5,
+                    "offset": 5
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 8,
+                    "offset": 8
+                  }
+                }
+              },
+              "value": null,
+              "loc": {
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+                  "offset": 5
+                },
+                "end": {
+                  "line": 1,
+                  "column": 8,
+                  "offset": 8
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 11,
+              "offset": 11
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "line": 1,
+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 11,
+            "offset": 11
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 11,
+          "offset": 11
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test7.js b/javascript/extractor/parser-tests/jcorn-jsx/test7.js
new file mode 100644
index 00000000000..24fde5faa42
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test7.js
@@ -0,0 +1 @@
+<n:a n:v />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test8.ast b/javascript/extractor/parser-tests/jcorn-jsx/test8.ast
new file mode 100644
index 00000000000..e74892f8083
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test8.ast
@@ -0,0 +1,377 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 1,
+                "offset": 1
+              },
+              "end": {
+                "line": 1,
+                "column": 2,
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": false,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXNamespacedName",
+                "namespace": {
+                  "type": "JSXIdentifier",
+                  "name": "n",
+                  "loc": {
+                    "start": {
+                      "line": 1,
+                      "column": 3,
+                      "offset": 3
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 4,
+                      "offset": 4
+                    }
+                  }
+                },
+                "name": {
+                  "type": "JSXIdentifier",
+                  "name": "foo",
+                  "loc": {
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+                      "line": 1,
+                      "column": 5,
+                      "offset": 5
+                    },
+                    "end": {
+                      "line": 1,
+                      "column": 8,
+                      "offset": 8
+                    }
+                  }
+                },
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 3,
+                    "offset": 3
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 8,
+                    "offset": 8
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "bar",
+                "raw": "\"bar\"",
+                "loc": {
+                  "start": {
+                    "line": 1,
+                    "column": 9,
+                    "offset": 9
+                  },
+                  "end": {
+                    "line": 1,
+                    "column": 14,
+                    "offset": 14
+                  }
+                }
+              },
+              "loc": {
+                "start": {
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+                  "column": 3,
+                  "offset": 3
+                },
+                "end": {
+                  "line": 1,
+                  "column": 14,
+                  "offset": 14
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "line": 1,
+              "column": 0,
+              "offset": 0
+            },
+            "end": {
+              "line": 1,
+              "column": 15,
+              "offset": 15
+            }
+          }
+        },
+        "closingElement": {
+          "type": "JSXClosingElement",
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+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
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+                "offset": 38
+              },
+              "end": {
+                "line": 1,
+                "column": 39,
+                "offset": 39
+              }
+            }
+          },
+          "loc": {
+            "start": {
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+              "column": 36,
+              "offset": 36
+            },
+            "end": {
+              "line": 1,
+              "column": 40,
+              "offset": 40
+            }
+          }
+        },
+        "children": [
+          {
+            "type": "Literal",
+            "value": " ",
+            "raw": " ",
+            "loc": {
+              "start": {
+                "line": 1,
+                "column": 15,
+                "offset": 15
+              },
+              "end": {
+                "line": 1,
+                "column": 16,
+                "offset": 16
+              }
+            }
+          },
+          {
+            "type": "JSXExpressionContainer",
+            "expression": {
+              "type": "Identifier",
+              "name": "value",
+              "loc": {
+                "start": {
+                  "line": 1,
+                  "column": 17,
+                  "offset": 17
+                },
+                "end": {
+                  "line": 1,
+                  "column": 22,
+                  "offset": 22
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+            },
+            "loc": {
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+              "end": {
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+            "type": "Literal",
+            "value": " ",
+            "raw": " ",
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+          {
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+                    "offset": 26
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+              "selfClosing": false,
+              "attributes": [],
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+                    "offset": 35
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+            },
+            "children": [
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+                        "offset": 28
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+                  "attributes": [],
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+                      "offset": 27
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+            "loc": {
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+            "column": 0,
+            "offset": 0
+          },
+          "end": {
+            "line": 1,
+            "column": 40,
+            "offset": 40
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "line": 1,
+          "column": 0,
+          "offset": 0
+        },
+        "end": {
+          "line": 1,
+          "column": 40,
+          "offset": 40
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test8.js b/javascript/extractor/parser-tests/jcorn-jsx/test8.js
new file mode 100644
index 00000000000..7f5a835341c
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test8.js
@@ -0,0 +1 @@
+<a n:foo="bar"> {value} <b><c /></b></a>
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test9.ast b/javascript/extractor/parser-tests/jcorn-jsx/test9.ast
new file mode 100644
index 00000000000..a76c9aef660
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test9.ast
@@ -0,0 +1,210 @@
+{
+  "type": "Program",
+  "body": [
+    {
+      "type": "ExpressionStatement",
+      "expression": {
+        "type": "JSXElement",
+        "openingElement": {
+          "type": "JSXOpeningElement",
+          "name": {
+            "type": "JSXIdentifier",
+            "name": "a",
+            "loc": {
+              "start": {
+                "offset": 1
+              },
+              "end": {
+                "offset": 2
+              }
+            }
+          },
+          "selfClosing": true,
+          "attributes": [
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "b",
+                "loc": {
+                  "start": {
+                    "offset": 3
+                  },
+                  "end": {
+                    "offset": 4
+                  }
+                }
+              },
+              "value": {
+                "type": "JSXExpressionContainer",
+                "expression": {
+                  "type": "Literal",
+                  "value": " ",
+                  "raw": "\" \"",
+                  "loc": {
+                    "start": {
+                      "offset": 6
+                    },
+                    "end": {
+                      "offset": 9
+                    }
+                  }
+                },
+                "loc": {
+                  "start": {
+                    "offset": 5
+                  },
+                  "end": {
+                    "offset": 10
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 3
+                },
+                "end": {
+                  "offset": 10
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "c",
+                "loc": {
+                  "start": {
+                    "offset": 11
+                  },
+                  "end": {
+                    "offset": 12
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": " ",
+                "raw": "\" \"",
+                "loc": {
+                  "start": {
+                    "offset": 13
+                  },
+                  "end": {
+                    "offset": 16
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 11
+                },
+                "end": {
+                  "offset": 16
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "d",
+                "loc": {
+                  "start": {
+                    "offset": 17
+                  },
+                  "end": {
+                    "offset": 18
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "&",
+                "raw": "\"&amp;\"",
+                "loc": {
+                  "start": {
+                    "offset": 19
+                  },
+                  "end": {
+                    "offset": 26
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 17
+                },
+                "end": {
+                  "offset": 26
+                }
+              }
+            },
+            {
+              "type": "JSXAttribute",
+              "name": {
+                "type": "JSXIdentifier",
+                "name": "e",
+                "loc": {
+                  "start": {
+                    "offset": 27
+                  },
+                  "end": {
+                    "offset": 28
+                  }
+                }
+              },
+              "value": {
+                "type": "Literal",
+                "value": "&ampr;",
+                "raw": "\"&ampr;\"",
+                "loc": {
+                  "start": {
+                    "offset": 29
+                  },
+                  "end": {
+                    "offset": 37
+                  }
+                }
+              },
+              "loc": {
+                "start": {
+                  "offset": 27
+                },
+                "end": {
+                  "offset": 37
+                }
+              }
+            }
+          ],
+          "loc": {
+            "start": {
+              "offset": 0
+            },
+            "end": {
+              "offset": 40
+            }
+          }
+        },
+        "closingElement": null,
+        "children": [],
+        "loc": {
+          "start": {
+            "offset": 0
+          },
+          "end": {
+            "offset": 40
+          }
+        }
+      },
+      "loc": {
+        "start": {
+          "offset": 0
+        },
+        "end": {
+          "offset": 40
+        }
+      }
+    }
+  ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/jcorn-jsx/test9.js b/javascript/extractor/parser-tests/jcorn-jsx/test9.js
new file mode 100644
index 00000000000..c15044cc5ad
--- /dev/null
+++ b/javascript/extractor/parser-tests/jcorn-jsx/test9.js
@@ -0,0 +1 @@
+<a b={" "} c=" " d="&amp;" e="&ampr;" />
\ No newline at end of file
diff --git a/javascript/extractor/parser-tests/robustness/letLookahead.js b/javascript/extractor/parser-tests/robustness/letLookahead.js
new file mode 100644
index 00000000000..4c9354f0e6c
--- /dev/null
+++ b/javascript/extractor/parser-tests/robustness/letLookahead.js
@@ -0,0 +1,505 @@
+let /* **/ x;
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
+'0123456789';
diff --git a/javascript/extractor/src/com/semmle/jcorn/CustomParser.java b/javascript/extractor/src/com/semmle/jcorn/CustomParser.java
new file mode 100644
index 00000000000..73aa3bad0b4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/CustomParser.java
@@ -0,0 +1,323 @@
+package com.semmle.jcorn;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+
+import com.semmle.jcorn.flow.FlowParser;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ComprehensionBlock;
+import com.semmle.js.ast.ComprehensionExpression;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.ForInStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IPattern;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.LetExpression;
+import com.semmle.js.ast.LetStatement;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.NewExpression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.util.data.Pair;
+
+/**
+ * An extension of the standard jcorn parser with support for Mozilla-specific
+ * language extension (most of JavaScript 1.8.5) and JScript language extensions.
+ */
+public class CustomParser extends FlowParser {
+	public CustomParser(Options options, String input, int startPos) {
+		super(options, input, startPos);
+
+		// recognise `const` as a keyword, irrespective of options.ecmaVersion
+		this.keywords.add("const");
+	}
+
+	// add parsing of guarded `catch` clauses
+	@Override
+	protected TryStatement parseTryStatement(Position startLoc) {
+		if (!options.mozExtensions())
+			return super.parseTryStatement(startLoc);
+
+		this.next();
+		BlockStatement block = this.parseBlock(false);
+		CatchClause handler = null;
+		List<CatchClause> guardedHandlers = new ArrayList<CatchClause>();
+		while (this.type == TokenType._catch) {
+			Position catchStartLoc = this.startLoc;
+			CatchClause katch = this.parseCatchClause(catchStartLoc);
+			if (handler != null)
+				this.raise(catchStartLoc, "Catch after unconditional catch");
+			if (katch.getGuard() != null)
+				guardedHandlers.add(katch);
+			else
+				handler = katch;
+		}
+		BlockStatement finalizer = this.eat(TokenType._finally) ? this.parseBlock(false) : null;
+		if (handler == null && finalizer == null && guardedHandlers.isEmpty())
+			this.raise(startLoc, "Missing catch or finally clause");
+		return this.finishNode(new TryStatement(new SourceLocation(startLoc), block, handler, guardedHandlers, finalizer));
+	}
+
+	/*
+	 * Support for guarded `catch` clauses and omitted catch bindings.
+	 */
+	@Override
+	protected CatchClause parseCatchClause(Position startLoc) {
+		if (!options.mozExtensions())
+			return super.parseCatchClause(startLoc);
+
+		this.next();
+		Expression param = null;
+		Expression guard = null;
+		if (this.eat(TokenType.parenL)) {
+			param = this.parseBindingAtom();
+			this.checkLVal(param, true, null);
+			if (this.eat(TokenType._if))
+				guard = this.parseExpression(false, null);
+			this.expect(TokenType.parenR);
+		} else if (!options.esnext()) {
+			this.unexpected();
+		}
+		BlockStatement catchBody = this.parseBlock(false);
+		return this.finishNode(new CatchClause(new SourceLocation(startLoc), (IPattern)param, guard, catchBody));
+	}
+
+	// add parsing of `let` statements and expressions
+	@Override
+	protected boolean mayFollowLet(int c) {
+		return options.mozExtensions() && c == '(' || super.mayFollowLet(c);
+	}
+
+	@Override
+	protected Statement parseVarStatement(Position startLoc, String kind) {
+		if (!options.mozExtensions())
+			return super.parseVarStatement(startLoc, kind);
+
+		this.next();
+
+		if ("let".equals(kind) && this.eat(TokenType.parenL)) {
+			// this is a `let` statement or expression
+			return (LetStatement) this.parseLetExpression(startLoc, true);
+		}
+
+		VariableDeclaration node = this.parseVar(startLoc, false, kind);
+		this.semicolon();
+		return this.finishNode(node);
+	}
+
+	@Override
+	protected Expression parseExprAtom(DestructuringErrors refDestructuringErrors) {
+		Position startLoc = this.startLoc;
+		if (options.mozExtensions() && this.isContextual("let")) {
+			this.next();
+			this.expect(TokenType.parenL);
+			return (Expression) this.parseLetExpression(startLoc, false);
+		} else if (options.mozExtensions() && this.type == TokenType.bracketL) {
+			this.next();
+			// check whether this is array comprehension or regular array
+			if (this.type == TokenType._for) {
+				return (Expression) this.parseComprehension(startLoc, false, null);
+			}
+			List<Expression> elements;
+			if (this.type == TokenType.comma || this.type == TokenType.bracketR ||
+					this.type == TokenType.ellipsis) {
+				elements = this.parseExprList(TokenType.bracketR, true, true, refDestructuringErrors);
+			} else {
+				Expression firstExpr = this.parseMaybeAssign(true, refDestructuringErrors, null);
+				// check whether this is a postfix array comprehension
+				if (this.type == TokenType._for || this.type == TokenType._if) {
+					return (Expression) this.parseComprehension(startLoc, false, firstExpr);
+				} else {
+					this.eat(TokenType.comma);
+					elements = new ArrayList<Expression>();
+					elements.add(firstExpr);
+					elements.addAll(this.parseExprList(TokenType.bracketR, true, true, refDestructuringErrors));
+				}
+			}
+			return this.finishNode(new ArrayExpression(new SourceLocation(startLoc), elements));
+		} else if (options.v8Extensions() && this.type == TokenType.modulo) {
+			// parse V8 native
+			this.next();
+			Identifier name = this.parseIdent(true);
+			this.expect(TokenType.parenL);
+			List<Expression> args = this.parseExprList(TokenType.parenR, false, false, null);
+			CallExpression node = new CallExpression(new SourceLocation(startLoc), name, new ArrayList<>(), args);
+			return this.finishNode(node);
+		} else {
+			return super.parseExprAtom(refDestructuringErrors);
+		}
+	}
+
+	protected Node parseLetExpression(Position startLoc, boolean maybeStatement) {
+		// this method assumes that the keyword `let` and the opening parenthesis have already been
+		// consumed
+		VariableDeclaration decl = this.parseVar(startLoc, false, "let");
+		this.expect(TokenType.parenR);
+
+		if (this.type == TokenType.braceL) {
+			if (!maybeStatement)
+				this.unexpected();
+			BlockStatement body = this.parseBlock(false);
+			return this.finishNode(new LetStatement(new SourceLocation(startLoc), decl.getDeclarations(), body));
+		} else if (maybeStatement) {
+			Position pos = startLoc;
+			Statement body = this.parseStatement(true, false);
+			if (body == null)
+				this.unexpected(pos);
+			return this.finishNode(new LetStatement(new SourceLocation(startLoc), decl.getDeclarations(), body));
+		} else {
+			Expression body = this.parseExpression(false, null);
+			return this.finishNode(new LetExpression(new SourceLocation(startLoc), decl.getDeclarations(), body));
+		}
+	}
+
+	// add parsing of expression closures and JScript methods
+	@Override
+	protected INode parseFunction(Position startLoc, boolean isStatement, boolean allowExpressionBody, boolean isAsync) {
+		if (isFunctionSent(isStatement))
+			return super.parseFunction(startLoc, isStatement, allowExpressionBody, isAsync);
+		allowExpressionBody = allowExpressionBody || options.mozExtensions() && !isStatement;
+		boolean oldInGen = this.inGenerator, oldInAsync = this.inAsync;
+		int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+		Pair<Boolean, Identifier> p = parseFunctionName(isStatement, isAsync);
+		boolean generator = p.fst();
+		Identifier id = p.snd(), iface = null;
+		if (options.jscript()) {
+			if (isStatement && this.eatDoubleColon()) {
+				iface = p.snd();
+				id = this.parseIdent(false);
+			}
+		}
+		IFunction result = parseFunctionRest(startLoc, isStatement, allowExpressionBody, oldInGen, oldInAsync,
+				oldYieldPos, oldAwaitPos, generator, id);
+		if (iface != null) {
+			/* Translate JScript double colon method declarations into normal method definitions:
+			 *
+			 *   function A::f(...) { ... }
+			 *
+			 * becomes
+			 *
+			 *   A.f = function f(...) { ... };
+			 */
+			SourceLocation memloc = new SourceLocation(iface.getName() + "::" + id.getName(), iface.getLoc().getStart(), id.getLoc().getEnd());
+			MemberExpression mem = new MemberExpression(memloc, iface, new Identifier(id.getLoc(), id.getName()), false);
+			AssignmentExpression assgn = new AssignmentExpression(result.getLoc(), "=", mem, ((FunctionDeclaration)result).asFunctionExpression());
+			return new ExpressionStatement(result.getLoc(), assgn);
+		}
+		return result;
+	}
+
+	private boolean eatDoubleColon() {
+		if (this.eat(TokenType.colon)) {
+			this.expect(TokenType.colon);
+			return true;
+		} else {
+			return this.eat(doubleColon);
+		}
+	}
+
+	// accept `yield` in non-generator functions
+	@Override
+	protected Expression parseMaybeAssign(boolean noIn,
+			DestructuringErrors refDestructuringErrors,
+			AfterLeftParse afterLeftParse) {
+		if (options.mozExtensions() && isContextual("yield")) {
+			if (!this.inFunction)
+				this.raise(this.startLoc, "Yield not in function");
+			return this.parseYield();
+		}
+		return super.parseMaybeAssign(noIn, refDestructuringErrors, afterLeftParse);
+	}
+
+	// add parsing of comprehensions
+	protected Node parseComprehension(Position startLoc, boolean isGenerator, Expression body) {
+		List<ComprehensionBlock> blocks = new ArrayList<ComprehensionBlock>();
+		while (this.type == TokenType._for) {
+			SourceLocation blockStart = new SourceLocation(this.startLoc);
+			this.next();
+			this.expect(TokenType.parenL);
+			Expression left = this.parseBindingAtom();
+			this.checkLVal(left, true, null);
+			boolean of;
+			if (this.eatContextual("of")) {
+				of = true;
+			} else {
+				this.expect(TokenType._in);
+				of = false;
+			}
+			Expression right = this.parseExpression(false, null);
+			this.expect(TokenType.parenR);
+			blocks.add(this.finishNode(new ComprehensionBlock(blockStart, (IPattern)left, right, of)));
+		}
+		Expression filter = this.eat(TokenType._if) ? this.parseParenExpression() : null;
+		if (body == null)
+			body = this.parseExpression(false, null);
+		this.expect(isGenerator ? TokenType.parenR : TokenType.bracketR);
+
+		return this.finishNode(new ComprehensionExpression(new SourceLocation(startLoc), body, blocks, filter, isGenerator));
+	}
+
+	@Override
+	protected Expression parseParenAndDistinguishExpression(boolean canBeArrow) {
+		if (options.mozExtensions()) {
+			// check whether next token is `for`, suggesting a generator comprehension
+			Position startLoc = this.startLoc;
+			Matcher m = Whitespace.skipWhiteSpace.matcher(this.input);
+			if (m.find(this.pos)) {
+				if (m.end()+3 < input.length() &&
+						"for".equals(input.substring(m.end(), m.end()+3)) &&
+						!Identifiers.isIdentifierChar(input.charAt(m.end()+3), true)) {
+					next();
+					return (Expression) parseComprehension(startLoc, true, null);
+				}
+			}
+		}
+
+		return super.parseParenAndDistinguishExpression(canBeArrow);
+	}
+
+	// add parsing of for-each loops
+	@Override
+	protected Statement parseForStatement(Position startLoc) {
+		boolean each = false;
+		if (options.mozExtensions() && this.isContextual("each")) {
+			this.next();
+			each = true;
+		}
+		Position afterEach = this.startLoc;
+		Statement result = super.parseForStatement(startLoc);
+		if (each) {
+			if (result instanceof ForInStatement) {
+				ForInStatement fis = (ForInStatement) result;
+				result = new ForInStatement(fis.getLoc(), fis.getLeft(), fis.getRight(), fis.getBody(), true);
+			} else {
+				raise(afterEach, "Bad for-each statement.");
+			}
+		}
+		return result;
+	}
+
+	// add parsing of Rhino/Nashorn-style `new` expressions with last argument after `)`
+	@Override
+	protected Expression parseNew() {
+		Expression res = super.parseNew();
+		if (res instanceof NewExpression &&
+				options.mozExtensions() && !canInsertSemicolon() && this.type == TokenType.braceL) {
+			((NewExpression) res).getArguments().add(this.parseObj(false, null));
+			res = this.finishNode(res);
+		}
+		return res;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/ESNextParser.java b/javascript/extractor/src/com/semmle/jcorn/ESNextParser.java
new file mode 100644
index 00000000000..a11293ca05f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/ESNextParser.java
@@ -0,0 +1,485 @@
+package com.semmle.jcorn;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.semmle.jcorn.TokenType.Properties;
+import com.semmle.jcorn.jsx.JSXParser;
+import com.semmle.js.ast.BindExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.DeclarationFlags;
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.DynamicImport;
+import com.semmle.js.ast.ExportDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportDefaultSpecifier;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportNamespaceSpecifier;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.FieldDefinition;
+import com.semmle.js.ast.ForOfStatement;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IPattern;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.RestElement;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Token;
+import com.semmle.util.collections.CollectionUtil;
+import com.semmle.util.data.Pair;
+
+/**
+ * An extension of the {@link JSXParser} with support for various
+ * unfinished ECMAScript proposals that are not supported by
+ * Acorn/jcorn yet.
+ *
+ * Once support becomes available, they should be removed from
+ * this class.
+ */
+public class ESNextParser extends JSXParser {
+	public ESNextParser(Options options, String input, int startPos) {
+		super(options.allowImportExportEverywhere(true), input, startPos);
+	}
+
+	/*
+	 * Support for proposed language feature "Object Rest/Spread Properties"
+	 * (http://sebmarkbage.github.io/ecmascript-rest-spread/).
+	 */
+
+	@Override
+	protected Property parseProperty(boolean isPattern, DestructuringErrors refDestructuringErrors,
+			Map<String, PropInfo> propHash) {
+		Position start = this.startLoc;
+
+		List<Decorator> decorators = parseDecorators();
+
+		Property prop = null;
+		if (this.type == TokenType.ellipsis) {
+			SpreadElement spread = this.parseSpread(null);
+			Expression val;
+			if (isPattern)
+				val = new RestElement(spread.getLoc(), spread.getArgument());
+			else
+				val = spread;
+			prop = this.finishNode(new Property(new SourceLocation(start), null, val, Property.Kind.INIT.name(), false, false));
+		}
+
+		if (prop == null)
+			prop = super.parseProperty(isPattern, refDestructuringErrors, propHash);
+
+		prop.addDecorators(decorators);
+
+		return prop;
+	}
+
+	@Override
+	protected INode toAssignable(INode node, boolean isBinding) {
+		if (node instanceof SpreadElement)
+			return new RestElement(node.getLoc(), ((SpreadElement) node).getArgument());
+		return super.toAssignable(node, isBinding);
+	}
+
+	@Override
+	protected void checkLVal(INode expr, boolean isBinding, Set<String> checkClashes) {
+		super.checkLVal(expr, isBinding, checkClashes);
+		if (expr instanceof ObjectPattern) {
+			ObjectPattern op = (ObjectPattern) expr;
+			if (op.hasRest())
+				checkLVal(op.getRest(), isBinding, checkClashes);
+		}
+	}
+
+	/*
+	 * Support for proposed language feature "Public Class Fields"
+	 * (http://jeffmo.github.io/es-class-public-fields/).
+	 */
+
+	private boolean classProperties() {
+		return options.esnext();
+	}
+
+	@Override
+	protected MemberDefinition<?> parseClassPropertyBody(PropertyInfo pi,
+			boolean hadConstructor, boolean isStatic) {
+		if (classProperties() && !pi.isGenerator && this.isClassProperty())
+			return this.parseFieldDefinition(pi, isStatic);
+		return super.parseClassPropertyBody(pi, hadConstructor, isStatic);
+	}
+
+	protected boolean isClassProperty() {
+		return this.type == TokenType.eq || this.type == TokenType.semi || this.canInsertSemicolon();
+	}
+
+	protected FieldDefinition parseFieldDefinition(PropertyInfo pi, boolean isStatic) {
+		Expression value = null;
+		if (this.type == TokenType.eq) {
+			this.next();
+			boolean oldInFunc = this.inFunction;
+			this.inFunction = true;
+			value = parseMaybeAssign(false, null, null);
+			this.inFunction = oldInFunc;
+		}
+		this.semicolon();
+		int flags = DeclarationFlags.getStatic(isStatic) | DeclarationFlags.getComputed(pi.computed);
+		return this.finishNode(new FieldDefinition(new SourceLocation(pi.startLoc), flags, pi.key, value));
+	}
+
+	/*
+	 * Support for proposed language feature "Generator function.sent Meta Property"
+	 * (https://github.com/allenwb/ESideas/blob/master/Generator%20metaproperty.md)
+	 */
+	private boolean functionSent() {
+		return options.esnext();
+	}
+
+	@Override
+	protected INode parseFunction(Position startLoc, boolean isStatement,
+			boolean allowExpressionBody, boolean isAsync) {
+		if (isFunctionSent(isStatement)) {
+			Identifier meta = this.finishNode(new Identifier(new SourceLocation(startLoc), "function"));
+			this.next();
+			Identifier property = parseIdent(true);
+			if (!property.getName().equals("sent"))
+				this.raiseRecoverable(property, "The only valid meta property for function is function.sent");
+			return this.finishNode(new MetaProperty(new SourceLocation(startLoc), meta, property));
+		}
+
+		return super.parseFunction(startLoc, isStatement, allowExpressionBody, isAsync);
+	}
+
+	protected boolean isFunctionSent(boolean isStatement) {
+		return functionSent() && !isStatement && inGenerator && !inAsync && this.type == TokenType.dot;
+	}
+
+	/*
+	 * Support for proposed language feature "Class and Property Decorators"
+	 * (https://github.com/wycats/javascript-decorators)
+	 */
+	private boolean decorators() {
+		return options.esnext();
+	}
+
+	protected TokenType at = new TokenType(new Properties("@").beforeExpr());
+
+	@Override
+	protected Token getTokenFromCode(int code) {
+		if (decorators() && code == 64) {
+			++this.pos;
+			return this.finishToken(at);
+		}
+		if (functionBind() && code == 58 && charAt(this.pos+1) == 58) {
+			this.pos += 2;
+			return this.finishToken(doubleColon);
+		}
+		return super.getTokenFromCode(code);
+	}
+
+	@Override
+	protected Statement parseStatement(boolean declaration, boolean topLevel,
+			Set<String> exports) {
+		List<Decorator> decorators = this.parseDecorators();
+		Statement stmt = super.parseStatement(declaration, topLevel, exports);
+
+		if (!decorators.isEmpty()) {
+			if (stmt instanceof ExportDeclaration) {
+				Node exported = null;
+				if (stmt instanceof ExportDefaultDeclaration) {
+					exported = ((ExportDefaultDeclaration) stmt).getDeclaration();
+				} else if (stmt instanceof ExportNamedDeclaration) {
+					exported = ((ExportNamedDeclaration) stmt).getDeclaration();
+				}
+				if (exported instanceof ClassDeclaration) {
+					((ClassDeclaration) exported).addDecorators(decorators);
+				} else if (exported instanceof ClassExpression) {
+					((ClassExpression) exported).addDecorators(decorators);
+				} else {
+					this.raise(stmt, "Decorators can only be attached to class exports");
+				}
+			} else if (stmt instanceof ClassDeclaration) {
+				((ClassDeclaration) stmt).addDecorators(decorators);
+			} else if (stmt != null) {
+				this.raise(stmt, "Leading decorators must be attached to a class declaration");
+			}
+		}
+
+		return stmt;
+	}
+
+	@Override
+	protected Expression parseExprAtom(DestructuringErrors refDestructuringErrors) {
+		if (this.type == at) {
+			List<Decorator> decorators = parseDecorators();
+			ClassExpression ce = (ClassExpression) this.parseClass(startLoc, false);
+			ce.addDecorators(decorators);
+			return ce;
+		}
+		if (this.type == doubleColon) {
+			SourceLocation startLoc = new SourceLocation(this.startLoc);
+			this.next();
+			int innerStart = this.start;
+			Position innerStartLoc = this.startLoc;
+			Expression callee = parseSubscripts(parseExprAtom(null), innerStart, innerStartLoc, true);
+			if (!(callee instanceof MemberExpression))
+				this.raiseRecoverable(callee, "Binding should be performed on a member expression.");
+			return this.finishNode(new BindExpression(startLoc, null, callee));
+		}
+		if (this.type == TokenType._import) {
+			Position startLoc = this.startLoc;
+			this.next();
+			this.expect(TokenType.parenL);
+			return parseDynamicImport(startLoc);
+		}
+		return super.parseExprAtom(refDestructuringErrors);
+	}
+
+	@Override
+	protected MemberDefinition<?> parseClassMember(boolean hadConstructor) {
+		List<Decorator> decorators = parseDecorators();
+		MemberDefinition<?> member = super.parseClassMember(hadConstructor);
+		if (!decorators.isEmpty() && member.isConstructor())
+			this.raiseRecoverable(member, "Decorators cannot be attached to class constructors.");
+		member.addDecorators(decorators);
+		return member;
+	}
+
+	private List<Decorator> parseDecorators() {
+		List<Decorator> result = new ArrayList<Decorator>();
+		while (this.type == at)
+			result.add(this.parseDecorator());
+		return result;
+	}
+
+	private Decorator parseDecorator() {
+		Position start = startLoc;
+		this.next();
+		Decorator decorator = new Decorator(new SourceLocation(start), this.parseMaybeAssign(false, null, null));
+		return this.finishNode(decorator);
+	}
+
+	/*
+	 * Support for proposed extensions to `export`
+	 * (http://leebyron.com/ecmascript-export-ns-from and http://leebyron.com/ecmascript-export-default-from)
+	 */
+	private boolean exportExtensions() {
+		return options.esnext();
+	}
+
+	@Override
+	protected ExportDeclaration parseExportRest(SourceLocation exportStart, Set<String> exports) {
+		if (exportExtensions() && this.isExportDefaultSpecifier()) {
+			Position specStart = this.startLoc;
+			Identifier exported = this.parseIdent(true);
+			ExportDefaultSpecifier defaultSpec = this.finishNode(new ExportDefaultSpecifier(new SourceLocation(specStart), exported));
+			List<ExportSpecifier> specifiers = CollectionUtil.makeList(defaultSpec);
+			if (this.type == TokenType.comma && this.lookahead(1, true).equals("*")) {
+				this.next();
+				specStart = this.startLoc;
+				this.expect(TokenType.star);
+				this.expectContextual("as");
+				exported = this.parseIdent(false);
+				ExportNamespaceSpecifier nsSpec = this.finishNode(new ExportNamespaceSpecifier(new SourceLocation(specStart), exported));
+				specifiers.add(nsSpec);
+			} else {
+				this.parseExportSpecifiersMaybe(specifiers, exports);
+			}
+			Literal source = (Literal) this.parseExportFrom(specifiers, null, true);
+			return this.finishNode(new ExportNamedDeclaration(exportStart, null, specifiers, source));
+		}
+
+		return super.parseExportRest(exportStart, exports);
+	}
+
+	@Override
+	protected ExportDeclaration parseExportAll(SourceLocation exportStart, Position starLoc, Set<String> exports) {
+		if (exportExtensions() && this.eatContextual("as")) {
+			Identifier exported = this.parseIdent(false);
+			ExportNamespaceSpecifier nsSpec = this.finishNode(new ExportNamespaceSpecifier(new SourceLocation(starLoc), exported));
+			List<ExportSpecifier> specifiers = CollectionUtil.makeList(nsSpec);
+			this.parseExportSpecifiersMaybe(specifiers, exports);
+			Literal source = (Literal) this.parseExportFrom(specifiers, null, true);
+			return this.finishNode(new ExportNamedDeclaration(exportStart, null, specifiers, source));
+		}
+
+		return super.parseExportAll(exportStart, starLoc, exports);
+	}
+
+	private boolean isExportDefaultSpecifier() {
+		if (this.type == TokenType.name) {
+			return !this.value.equals("type") &&
+					!this.value.equals("async") &&
+					!this.value.equals("interface") &&
+					!this.value.equals("let");
+		}
+
+		if (this.type != TokenType._default)
+			return false;
+
+		return this.lookahead(1, true).equals(",") || this.lookaheadIsIdent("from", true);
+	}
+
+	private void parseExportSpecifiersMaybe(List<ExportSpecifier> specifiers, Set<String> exports) {
+		if (this.eat(TokenType.comma)) {
+			specifiers.addAll(this.parseExportSpecifiers(exports));
+		}
+	}
+
+	/*
+	 * Support for proposed language feature "Function Bind Syntax"
+	 * (https://github.com/tc39/proposal-bind-operator)
+	 */
+	private boolean functionBind() {
+		return options.esnext();
+	}
+
+	protected TokenType doubleColon = new TokenType(new Properties("::").beforeExpr());
+
+	@Override
+	protected Pair<Expression, Boolean> parseSubscript(Expression base, Position startLoc, boolean noCalls) {
+		if (!noCalls && this.eat(doubleColon)) {
+			Expression callee = parseSubscripts(parseExprAtom(null), this.start, this.startLoc, true);
+			BindExpression bind = new BindExpression(new SourceLocation(startLoc), base, callee);
+			return Pair.make(this.finishNode(bind), true);
+		}
+		return super.parseSubscript(base, startLoc, noCalls);
+	}
+
+	/*
+	 * Support for proposed language feature "Optional Catch Binding"
+	 * (https://github.com/tc39/proposal-optional-catch-binding)
+	 */
+	@Override
+	protected CatchClause parseCatchClause(Position startLoc) {
+		this.next();
+		Expression param = null;
+		if (this.eat(TokenType.parenL)) {
+			param = this.parseBindingAtom();
+			this.checkLVal(param, true, null);
+			this.expect(TokenType.parenR);
+		} else if (!options.esnext()) {
+			this.unexpected();
+		}
+		BlockStatement catchBody = this.parseBlock(false);
+		return this.finishNode(new CatchClause(new SourceLocation(startLoc), (IPattern)param, null, catchBody));
+	}
+
+	/*
+	 * Support for proposed language feature "Dynamic import"
+	 * (https://github.com/tc39/proposal-dynamic-import).
+	 */
+	@Override
+	protected Statement parseImport(Position startLoc) {
+		if (!options.esnext())
+			return super.parseImport(startLoc);
+
+		int startPos = this.start;
+		SourceLocation loc = new SourceLocation(startLoc);
+		this.next();
+		if (this.eat(TokenType.parenL)) {
+			DynamicImport di = parseDynamicImport(startLoc);
+			Expression expr = parseSubscripts(di, startPos, startLoc, false);
+			return parseExpressionStatement(false, startLoc, expr);
+		} else {
+			return super.parseImportRest(loc);
+		}
+	}
+
+	/**
+	 * Parses a dynamic import, assuming that the keyword `import` and the
+	 * opening parenthesis have already been consumed.
+	 */
+	private DynamicImport parseDynamicImport(Position startLoc) {
+		Expression source = parseMaybeAssign(false, null, null);
+		this.expect(TokenType.parenR);
+		DynamicImport di = this.finishNode(new DynamicImport(new SourceLocation(startLoc), source));
+		return di;
+	}
+
+	/*
+	 * Support for proposed language feature "Asynchronous iteration"
+	 * (https://github.com/tc39/proposal-async-iteration)
+	 */
+	@Override
+	protected Statement parseForStatement(Position startLoc) {
+		int startPos = this.start;
+		boolean isAwait = false;
+		if (this.inAsync && this.eatContextual("await"))
+			isAwait = true;
+		Statement forStmt = super.parseForStatement(startLoc);
+		if (isAwait) {
+			if (forStmt instanceof ForOfStatement)
+				((ForOfStatement) forStmt).setAwait(true);
+			else
+				this.raiseRecoverable(startPos, "Only for-of statements can be annotated with 'await'.");
+		}
+		return forStmt;
+	}
+
+	@Override
+	protected boolean parseGeneratorMarker(boolean isAsync) {
+		// always allow `*`, even if `isAsync` is true
+		return this.eat(TokenType.star);
+	}
+
+	/*
+	 * Support for proposed language feature "Numeric separators"
+	 * (https://github.com/tc39/proposal-numeric-separator)
+	 */
+
+	@Override
+	protected Number readInt(int radix, Integer len) {
+		// implementation mostly copied from super class
+		int start = this.pos, code = -1;
+		double total = 0;
+		// no leading underscore
+		boolean underscoreAllowed = false;
+
+		for (int i = 0, e = len == null ? Integer.MAX_VALUE : len; i < e; ++i) {
+			if (this.pos >= this.input.length())
+				break;
+			code = this.input.charAt(this.pos);
+
+			if (code == '_') {
+				if (underscoreAllowed) {
+					// no adjacent underscores
+					underscoreAllowed = false;
+					++this.pos;
+					continue;
+				}
+			} else {
+				underscoreAllowed = true;
+			}
+
+			int val;
+			if (code >= 97) val = code - 97 + 10; // a
+			else if (code >= 65) val = code - 65 + 10; // A
+			else if (code >= 48 && code <= 57) val = code - 48; // 0-9
+			else val = Integer.MAX_VALUE;
+			if (val >= radix) break;
+
+			++this.pos;
+			total = total * radix + val;
+		}
+		if (this.pos == start || len != null && this.pos - start != len) return null;
+
+		if (code == '_')
+			// no trailing underscore
+			return null;
+
+		return total;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/Identifiers.java b/javascript/extractor/src/com/semmle/jcorn/Identifiers.java
new file mode 100644
index 00000000000..363ab88eb42
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/Identifiers.java
@@ -0,0 +1,117 @@
+package com.semmle.jcorn;
+
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+/// identifier.js
+public class Identifiers {
+	public static enum Dialect {
+		ECMA_3, ECMA_5, ECMA_6, ECMA_7, ECMA_8, STRICT, STRICT_BIND
+	}
+
+	// Reserved word lists for various dialects of the language
+	public static final Map<Dialect, Set<String>> reservedWords = new LinkedHashMap<>();
+	static {
+		reservedWords.put(Dialect.ECMA_3, stringSet("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile"));
+		reservedWords.put(Dialect.ECMA_5, stringSet("class enum extends super const export import"));
+		reservedWords.put(Dialect.ECMA_6, stringSet("enum"));
+		reservedWords.put(Dialect.ECMA_7, stringSet("enum"));
+		reservedWords.put(Dialect.ECMA_8, stringSet("enum"));
+		reservedWords.put(Dialect.STRICT, stringSet("implements interface let package private protected public static yield"));
+		reservedWords.put(Dialect.STRICT_BIND, stringSet("eval arguments"));
+	}
+
+	// And the keywords
+	private static final String ecma5AndLessKeywords = "break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this";
+	private static final String ecma6Keywords = ecma5AndLessKeywords + " const class extends export import super";
+
+	public static final Map<Dialect, Set<String>> keywords = new LinkedHashMap<>();
+	static {
+		keywords.put(Dialect.ECMA_5, stringSet(ecma5AndLessKeywords));
+		keywords.put(Dialect.ECMA_6, stringSet(ecma6Keywords));
+	}
+
+	private static Set<String> stringSet(String words) {
+		Set<String> result = new LinkedHashSet<String>();
+		for (String word : words.split(" "))
+			result.add(word);
+		return result;
+	}
+
+	// ## Character categories
+
+	private static final String nonASCIIidentifierStartChars =
+			"\\xaa\\xb5\\xba\\xc0-\\xd6\\xd8-\\xf6\\xf8-\\u02c1\\u02c6-\\u02d1\\u02e0-\\u02e4\\u02ec\\u02ee\\u0370-\\u0374\\u0376\\u0377\\u037a-\\u037d\\u037f\\u0386\\u0388-\\u038a\\u038c\\u038e-\\u03a1\\u03a3-\\u03f5\\u03f7-\\u0481\\u048a-\\u052f\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05d0-\\u05ea\\u05f0-\\u05f2\\u0620-\\u064a\\u066e\\u066f\\u0671-\\u06d3\\u06d5\\u06e5\\u06e6\\u06ee\\u06ef\\u06fa-\\u06fc\\u06ff\\u0710\\u0712-\\u072f\\u074d-\\u07a5\\u07b1\\u07ca-\\u07ea\\u07f4\\u07f5\\u07fa\\u0800-\\u0815\\u081a\\u0824\\u0828\\u0840-\\u0858\\u08a0-\\u08b4\\u08b6-\\u08bd\\u0904-\\u0939\\u093d\\u0950\\u0958-\\u0961\\u0971-\\u0980\\u0985-\\u098c\\u098f\\u0990\\u0993-\\u09a8\\u09aa-\\u09b0\\u09b2\\u09b6-\\u09b9\\u09bd\\u09ce\\u09dc\\u09dd\\u09df-\\u09e1\\u09f0\\u09f1\\u0a05-\\u0a0a\\u0a0f\\u0a10\\u0a13-\\u0a28\\u0a2a-\\u0a30\\u0a32\\u0a33\\u0a35\\u0a36\\u0a38\\u0a39\\u0a59-\\u0a5c\\u0a5e\\u0a72-\\u0a74\\u0a85-\\u0a8d\\u0a8f-\\u0a91\\u0a93-\\u0aa8\\u0aaa-\\u0ab0\\u0ab2\\u0ab3\\u0ab5-\\u0ab9\\u0abd\\u0ad0\\u0ae0\\u0ae1\\u0af9\\u0b05-\\u0b0c\\u0b0f\\u0b10\\u0b13-\\u0b28\\u0b2a-\\u0b30\\u0b32\\u0b33\\u0b35-\\u0b39\\u0b3d\\u0b5c\\u0b5d\\u0b5f-\\u0b61\\u0b71\\u0b83\\u0b85-\\u0b8a\\u0b8e-\\u0b90\\u0b92-\\u0b95\\u0b99\\u0b9a\\u0b9c\\u0b9e\\u0b9f\\u0ba3\\u0ba4\\u0ba8-\\u0baa\\u0bae-\\u0bb9\\u0bd0\\u0c05-\\u0c0c\\u0c0e-\\u0c10\\u0c12-\\u0c28\\u0c2a-\\u0c39\\u0c3d\\u0c58-\\u0c5a\\u0c60\\u0c61\\u0c80\\u0c85-\\u0c8c\\u0c8e-\\u0c90\\u0c92-\\u0ca8\\u0caa-\\u0cb3\\u0cb5-\\u0cb9\\u0cbd\\u0cde\\u0ce0\\u0ce1\\u0cf1\\u0cf2\\u0d05-\\u0d0c\\u0d0e-\\u0d10\\u0d12-\\u0d3a\\u0d3d\\u0d4e\\u0d54-\\u0d56\\u0d5f-\\u0d61\\u0d7a-\\u0d7f\\u0d85-\\u0d96\\u0d9a-\\u0db1\\u0db3-\\u0dbb\\u0dbd\\u0dc0-\\u0dc6\\u0e01-\\u0e30\\u0e32\\u0e33\\u0e40-\\u0e46\\u0e81\\u0e82\\u0e84\\u0e87\\u0e88\\u0e8a\\u0e8d\\u0e94-\\u0e97\\u0e99-\\u0e9f\\u0ea1-\\u0ea3\\u0ea5\\u0ea7\\u0eaa\\u0eab\\u0ead-\\u0eb0\\u0eb2\\u0eb3\\u0ebd\\u0ec0-\\u0ec4\\u0ec6\\u0edc-\\u0edf\\u0f00\\u0f40-\\u0f47\\u0f49-\\u0f6c\\u0f88-\\u0f8c\\u1000-\\u102a\\u103f\\u1050-\\u1055\\u105a-\\u105d\\u1061\\u1065\\u1066\\u106e-\\u1070\\u1075-\\u1081\\u108e\\u10a0-\\u10c5\\u10c7\\u10cd\\u10d0-\\u10fa\\u10fc-\\u1248\\u124a-\\u124d\\u1250-\\u1256\\u1258\\u125a-\\u125d\\u1260-\\u1288\\u128a-\\u128d\\u1290-\\u12b0\\u12b2-\\u12b5\\u12b8-\\u12be\\u12c0\\u12c2-\\u12c5\\u12c8-\\u12d6\\u12d8-\\u1310\\u1312-\\u1315\\u1318-\\u135a\\u1380-\\u138f\\u13a0-\\u13f5\\u13f8-\\u13fd\\u1401-\\u166c\\u166f-\\u167f\\u1681-\\u169a\\u16a0-\\u16ea\\u16ee-\\u16f8\\u1700-\\u170c\\u170e-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176c\\u176e-\\u1770\\u1780-\\u17b3\\u17d7\\u17dc\\u1820-\\u1877\\u1880-\\u18a8\\u18aa\\u18b0-\\u18f5\\u1900-\\u191e\\u1950-\\u196d\\u1970-\\u1974\\u1980-\\u19ab\\u19b0-\\u19c9\\u1a00-\\u1a16\\u1a20-\\u1a54\\u1aa7\\u1b05-\\u1b33\\u1b45-\\u1b4b\\u1b83-\\u1ba0\\u1bae\\u1baf\\u1bba-\\u1be5\\u1c00-\\u1c23\\u1c4d-\\u1c4f\\u1c5a-\\u1c7d\\u1c80-\\u1c88\\u1ce9-\\u1cec\\u1cee-\\u1cf1\\u1cf5\\u1cf6\\u1d00-\\u1dbf\\u1e00-\\u1f15\\u1f18-\\u1f1d\\u1f20-\\u1f45\\u1f48-\\u1f4d\\u1f50-\\u1f57\\u1f59\\u1f5b\\u1f5d\\u1f5f-\\u1f7d\\u1f80-\\u1fb4\\u1fb6-\\u1fbc\\u1fbe\\u1fc2-\\u1fc4\\u1fc6-\\u1fcc\\u1fd0-\\u1fd3\\u1fd6-\\u1fdb\\u1fe0-\\u1fec\\u1ff2-\\u1ff4\\u1ff6-\\u1ffc\\u2071\\u207f\\u2090-\\u209c\\u2102\\u2107\\u210a-\\u2113\\u2115\\u2118-\\u211d\\u2124\\u2126\\u2128\\u212a-\\u2139\\u213c-\\u213f\\u2145-\\u2149\\u214e\\u2160-\\u2188\\u2c00-\\u2c2e\\u2c30-\\u2c5e\\u2c60-\\u2ce4\\u2ceb-\\u2cee\\u2cf2\\u2cf3\\u2d00-\\u2d25\\u2d27\\u2d2d\\u2d30-\\u2d67\\u2d6f\\u2d80-\\u2d96\\u2da0-\\u2da6\\u2da8-\\u2dae\\u2db0-\\u2db6\\u2db8-\\u2dbe\\u2dc0-\\u2dc6\\u2dc8-\\u2dce\\u2dd0-\\u2dd6\\u2dd8-\\u2dde\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303c\\u3041-\\u3096\\u309b-\\u309f\\u30a1-\\u30fa\\u30fc-\\u30ff\\u3105-\\u312d\\u3131-\\u318e\\u31a0-\\u31ba\\u31f0-\\u31ff\\u3400-\\u4db5\\u4e00-\\u9fd5\\ua000-\\ua48c\\ua4d0-\\ua4fd\\ua500-\\ua60c\\ua610-\\ua61f\\ua62a\\ua62b\\ua640-\\ua66e\\ua67f-\\ua69d\\ua6a0-\\ua6ef\\ua717-\\ua71f\\ua722-\\ua788\\ua78b-\\ua7ae\\ua7b0-\\ua7b7\\ua7f7-\\ua801\\ua803-\\ua805\\ua807-\\ua80a\\ua80c-\\ua822\\ua840-\\ua873\\ua882-\\ua8b3\\ua8f2-\\ua8f7\\ua8fb\\ua8fd\\ua90a-\\ua925\\ua930-\\ua946\\ua960-\\ua97c\\ua984-\\ua9b2\\ua9cf\\ua9e0-\\ua9e4\\ua9e6-\\ua9ef\\ua9fa-\\ua9fe\\uaa00-\\uaa28\\uaa40-\\uaa42\\uaa44-\\uaa4b\\uaa60-\\uaa76\\uaa7a\\uaa7e-\\uaaaf\\uaab1\\uaab5\\uaab6\\uaab9-\\uaabd\\uaac0\\uaac2\\uaadb-\\uaadd\\uaae0-\\uaaea\\uaaf2-\\uaaf4\\uab01-\\uab06\\uab09-\\uab0e\\uab11-\\uab16\\uab20-\\uab26\\uab28-\\uab2e\\uab30-\\uab5a\\uab5c-\\uab65\\uab70-\\uabe2\\uac00-\\ud7a3\\ud7b0-\\ud7c6\\ud7cb-\\ud7fb\\uf900-\\ufa6d\\ufa70-\\ufad9\\ufb00-\\ufb06\\ufb13-\\ufb17\\ufb1d\\ufb1f-\\ufb28\\ufb2a-\\ufb36\\ufb38-\\ufb3c\\ufb3e\\ufb40\\ufb41\\ufb43\\ufb44\\ufb46-\\ufbb1\\ufbd3-\\ufd3d\\ufd50-\\ufd8f\\ufd92-\\ufdc7\\ufdf0-\\ufdfb\\ufe70-\\ufe74\\ufe76-\\ufefc\\uff21-\\uff3a\\uff41-\\uff5a\\uff66-\\uffbe\\uffc2-\\uffc7\\uffca-\\uffcf\\uffd2-\\uffd7\\uffda-\\uffdc";
+	private static final String nonASCIIidentifierChars =
+			"\\u200c\\u200d\\xb7\\u0300-\\u036f\\u0387\\u0483-\\u0487\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u064b-\\u0669\\u0670\\u06d6-\\u06dc\\u06df-\\u06e4\\u06e7\\u06e8\\u06ea-\\u06ed\\u06f0-\\u06f9\\u0711\\u0730-\\u074a\\u07a6-\\u07b0\\u07c0-\\u07c9\\u07eb-\\u07f3\\u0816-\\u0819\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0859-\\u085b\\u08d4-\\u08e1\\u08e3-\\u0903\\u093a-\\u093c\\u093e-\\u094f\\u0951-\\u0957\\u0962\\u0963\\u0966-\\u096f\\u0981-\\u0983\\u09bc\\u09be-\\u09c4\\u09c7\\u09c8\\u09cb-\\u09cd\\u09d7\\u09e2\\u09e3\\u09e6-\\u09ef\\u0a01-\\u0a03\\u0a3c\\u0a3e-\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a66-\\u0a71\\u0a75\\u0a81-\\u0a83\\u0abc\\u0abe-\\u0ac5\\u0ac7-\\u0ac9\\u0acb-\\u0acd\\u0ae2\\u0ae3\\u0ae6-\\u0aef\\u0b01-\\u0b03\\u0b3c\\u0b3e-\\u0b44\\u0b47\\u0b48\\u0b4b-\\u0b4d\\u0b56\\u0b57\\u0b62\\u0b63\\u0b66-\\u0b6f\\u0b82\\u0bbe-\\u0bc2\\u0bc6-\\u0bc8\\u0bca-\\u0bcd\\u0bd7\\u0be6-\\u0bef\\u0c00-\\u0c03\\u0c3e-\\u0c44\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62\\u0c63\\u0c66-\\u0c6f\\u0c81-\\u0c83\\u0cbc\\u0cbe-\\u0cc4\\u0cc6-\\u0cc8\\u0cca-\\u0ccd\\u0cd5\\u0cd6\\u0ce2\\u0ce3\\u0ce6-\\u0cef\\u0d01-\\u0d03\\u0d3e-\\u0d44\\u0d46-\\u0d48\\u0d4a-\\u0d4d\\u0d57\\u0d62\\u0d63\\u0d66-\\u0d6f\\u0d82\\u0d83\\u0dca\\u0dcf-\\u0dd4\\u0dd6\\u0dd8-\\u0ddf\\u0de6-\\u0def\\u0df2\\u0df3\\u0e31\\u0e34-\\u0e3a\\u0e47-\\u0e4e\\u0e50-\\u0e59\\u0eb1\\u0eb4-\\u0eb9\\u0ebb\\u0ebc\\u0ec8-\\u0ecd\\u0ed0-\\u0ed9\\u0f18\\u0f19\\u0f20-\\u0f29\\u0f35\\u0f37\\u0f39\\u0f3e\\u0f3f\\u0f71-\\u0f84\\u0f86\\u0f87\\u0f8d-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u102b-\\u103e\\u1040-\\u1049\\u1056-\\u1059\\u105e-\\u1060\\u1062-\\u1064\\u1067-\\u106d\\u1071-\\u1074\\u1082-\\u108d\\u108f-\\u109d\\u135d-\\u135f\\u1369-\\u1371\\u1712-\\u1714\\u1732-\\u1734\\u1752\\u1753\\u1772\\u1773\\u17b4-\\u17d3\\u17dd\\u17e0-\\u17e9\\u180b-\\u180d\\u1810-\\u1819\\u18a9\\u1920-\\u192b\\u1930-\\u193b\\u1946-\\u194f\\u19d0-\\u19da\\u1a17-\\u1a1b\\u1a55-\\u1a5e\\u1a60-\\u1a7c\\u1a7f-\\u1a89\\u1a90-\\u1a99\\u1ab0-\\u1abd\\u1b00-\\u1b04\\u1b34-\\u1b44\\u1b50-\\u1b59\\u1b6b-\\u1b73\\u1b80-\\u1b82\\u1ba1-\\u1bad\\u1bb0-\\u1bb9\\u1be6-\\u1bf3\\u1c24-\\u1c37\\u1c40-\\u1c49\\u1c50-\\u1c59\\u1cd0-\\u1cd2\\u1cd4-\\u1ce8\\u1ced\\u1cf2-\\u1cf4\\u1cf8\\u1cf9\\u1dc0-\\u1df5\\u1dfb-\\u1dff\\u203f\\u2040\\u2054\\u20d0-\\u20dc\\u20e1\\u20e5-\\u20f0\\u2cef-\\u2cf1\\u2d7f\\u2de0-\\u2dff\\u302a-\\u302f\\u3099\\u309a\\ua620-\\ua629\\ua66f\\ua674-\\ua67d\\ua69e\\ua69f\\ua6f0\\ua6f1\\ua802\\ua806\\ua80b\\ua823-\\ua827\\ua880\\ua881\\ua8b4-\\ua8c5\\ua8d0-\\ua8d9\\ua8e0-\\ua8f1\\ua900-\\ua909\\ua926-\\ua92d\\ua947-\\ua953\\ua980-\\ua983\\ua9b3-\\ua9c0\\ua9d0-\\ua9d9\\ua9e5\\ua9f0-\\ua9f9\\uaa29-\\uaa36\\uaa43\\uaa4c\\uaa4d\\uaa50-\\uaa59\\uaa7b-\\uaa7d\\uaab0\\uaab2-\\uaab4\\uaab7\\uaab8\\uaabe\\uaabf\\uaac1\\uaaeb-\\uaaef\\uaaf5\\uaaf6\\uabe3-\\uabea\\uabec\\uabed\\uabf0-\\uabf9\\ufb1e\\ufe00-\\ufe0f\\ufe20-\\ufe2f\\ufe33\\ufe34\\ufe4d-\\ufe4f\\uff10-\\uff19\\uff3f";
+
+	private static Pattern nonASCIIidentifierStartPattern;
+	private static Pattern nonASCIIidentifierPattern;
+
+	private static Pattern nonASCIIidentifierStart() {
+		if (nonASCIIidentifierStartPattern == null)
+			nonASCIIidentifierStartPattern = Pattern.compile("[" + nonASCIIidentifierStartChars + "]");
+		return nonASCIIidentifierStartPattern;
+	}
+
+	private static Pattern nonASCIIidentifier() {
+		if (nonASCIIidentifierPattern == null)
+			nonASCIIidentifierPattern = Pattern.compile("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
+		return nonASCIIidentifierPattern;
+	}
+
+	// These are a run-length and offset encoded representation of the
+	// >0xffff code points that are a valid part of identifiers. The
+	// offset starts at 0x10000, and each pair of numbers represents an
+	// offset to the next range, and then a size of the range. They were
+	// generated by bin/generate-identifier-regex.js
+	private static final int[] astralIdentifierStartCodes = {0,11,2,25,2,18,2,1,2,14,3,13,35,122,70,52,268,28,4,48,48,31,17,26,6,37,11,29,3,35,5,7,2,4,43,157,19,35,5,35,5,39,9,51,157,310,10,21,11,7,153,5,3,0,2,43,2,1,4,0,3,22,11,22,10,30,66,18,2,1,11,21,11,25,71,55,7,1,65,0,16,3,2,2,2,26,45,28,4,28,36,7,2,27,28,53,11,21,11,18,14,17,111,72,56,50,14,50,785,52,76,44,33,24,27,35,42,34,4,0,13,47,15,3,22,0,2,0,36,17,2,24,85,6,2,0,2,3,2,14,2,9,8,46,39,7,3,1,3,21,2,6,2,1,2,4,4,0,19,0,13,4,159,52,19,3,54,47,21,1,2,0,185,46,42,3,37,47,21,0,60,42,86,25,391,63,32,0,449,56,264,8,2,36,18,0,50,29,881,921,103,110,18,195,2749,1070,4050,582,8634,568,8,30,114,29,19,47,17,3,32,20,6,18,881,68,12,0,67,12,65,0,32,6124,20,754,9486,1,3071,106,6,12,4,8,8,9,5991,84,2,70,2,1,3,0,3,1,3,3,2,11,2,0,2,6,2,64,2,3,3,7,2,6,2,27,2,3,2,4,2,0,4,6,2,339,3,24,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,30,2,24,2,7,4149,196,60,67,1213,3,2,26,2,1,2,0,3,0,2,9,2,3,2,0,2,0,7,0,5,0,2,0,2,0,2,2,2,1,2,0,3,0,2,0,2,0,2,0,2,0,2,1,2,0,3,3,2,6,2,3,2,3,2,0,2,9,2,16,6,2,2,4,2,16,4421,42710,42,4148,12,221,3,5761,10591,541};
+	private static final int[] astralIdentifierCodes = {509,0,227,0,150,4,294,9,1368,2,2,1,6,3,41,2,5,0,166,1,1306,2,54,14,32,9,16,3,46,10,54,9,7,2,37,13,2,9,52,0,13,2,49,13,10,2,4,9,83,11,7,0,161,11,6,9,7,3,57,0,2,6,3,1,3,2,10,0,11,1,3,6,4,4,193,17,10,9,87,19,13,9,214,6,3,8,28,1,83,16,16,9,82,12,9,9,84,14,5,9,423,9,838,7,2,7,17,9,57,21,2,13,19882,9,135,4,60,6,26,9,1016,45,17,3,19723,1,5319,4,4,5,9,7,3,6,31,3,149,2,1418,49,513,54,5,49,9,0,15,0,23,4,2,14,1361,6,2,16,3,6,2,1,2,4,2214,6,110,6,6,9,792487,239};
+
+	// This has a complexity linear to the value of the code. The
+	// assumption is that looking up astral identifier characters is
+	// rare.
+	private static boolean isInAstralSet(int code, int[] set) {
+		int pos = 0x10000;
+		for (int i = 0; i < set.length; i += 2) {
+			pos += set[i];
+			if (pos > code)
+				return false;
+			pos += set[i + 1];
+			if (pos >= code)
+				return true;
+		}
+		return false;
+	}
+
+	// Test whether a given character code starts an identifier.
+
+	public static boolean isIdentifierStart(int code, boolean astral) {
+		if (code < 65) return code == 36;
+		if (code < 91) return true;
+		if (code < 97) return code == 95;
+		if (code < 123) return true;
+		if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifierStart().matcher(str(code)).matches();
+		if (!astral) return false;
+		return isInAstralSet(code, astralIdentifierStartCodes);
+	}
+
+	public static boolean isIdentifierChar(int code, boolean astral) {
+		if (code < 48) return code == 36;
+		if (code < 58) return true;
+		if (code < 65) return false;
+		if (code < 91) return true;
+		if (code < 97) return code == 95;
+		if (code < 123) return true;
+		if (code <= 0xffff) return code >= 0xaa && nonASCIIidentifier().matcher(str(code)).matches();
+		if (!astral) return false;
+		return isInAstralSet(code, astralIdentifierStartCodes) || isInAstralSet(code, astralIdentifierCodes);
+	}
+
+	private static String str(int i) {
+		return new String(Character.toChars(i));
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/Locutil.java b/javascript/extractor/src/com/semmle/jcorn/Locutil.java
new file mode 100644
index 00000000000..3ef911da6e9
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/Locutil.java
@@ -0,0 +1,27 @@
+package com.semmle.jcorn;
+
+import java.util.regex.Matcher;
+
+import com.semmle.js.ast.Position;
+
+/// locutil.js
+public class Locutil {
+	/**
+	 * The `getLineInfo` function is mostly useful when the
+	 * `locations` option is off (for performance reasons) and you
+	 * want to find the line/column position for a given character
+	 * offset. `input` should be the code string that the offset refers
+	 * into.
+	 */
+	public static Position getLineInfo(String input, int offset) {
+		Matcher lineBreakG = Whitespace.lineBreakG.matcher(input);
+		for (int line = 1, cur = 0;;) {
+			if (lineBreakG.find(cur) && lineBreakG.start() < offset) {
+				++line;
+				cur = lineBreakG.end();
+			} else {
+				return new Position(line, offset - cur, offset);
+			}
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/Options.java b/javascript/extractor/src/com/semmle/jcorn/Options.java
new file mode 100644
index 00000000000..0b854f20460
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/Options.java
@@ -0,0 +1,238 @@
+package com.semmle.jcorn;
+
+import java.util.List;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+import com.semmle.jcorn.Identifiers.Dialect;
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Token;
+
+/// options.js
+public class Options {
+	public enum AllowReserved {
+		YES(true), NO(false), NEVER(false);
+
+		private final boolean isTrue;
+
+		private AllowReserved(boolean isTrue) {
+			this.isTrue = isTrue;
+		}
+
+		public boolean isTrue() {
+			return isTrue;
+		}
+	}
+
+	public interface OnCommentCallback {
+		public void call(boolean block, String input, String text, int start, int end, Position startLoc, Position endLoc);
+	}
+
+	private boolean allowHashBang, allowReturnOutsideFunction, allowImportExportEverywhere;
+	private boolean preserveParens, mozExtensions, jscript, esnext, v8Extensions;
+	private int ecmaVersion;
+	private AllowReserved allowReserved;
+	private String sourceType;
+	private BiFunction<Integer, Position, Void> onInsertedSemicolon, onTrailingComma;
+	private Function<Token, Void> onToken;
+	private OnCommentCallback onComment;
+	private Program program;
+	private Function<SyntaxError, ?> onRecoverableError;
+
+	public Options() {
+		this.ecmaVersion = 7;
+		this.sourceType = "script";
+		this.onInsertedSemicolon = null;
+		this.onTrailingComma = null;
+		this.allowReserved = AllowReserved.YES;
+		this.allowReturnOutsideFunction = false;
+		this.allowImportExportEverywhere = false;
+		this.allowHashBang = false;
+		this.onToken = null;
+		this.onComment = null;
+		this.program = null;
+		this.preserveParens = false;
+		this.mozExtensions = false;
+		this.jscript = false;
+		this.esnext = false;
+		this.v8Extensions = false;
+		this.onRecoverableError = null;
+	}
+
+	public Options(Options that) {
+		this.allowHashBang = that.allowHashBang;
+		this.allowReturnOutsideFunction = that.allowReturnOutsideFunction;
+		this.allowImportExportEverywhere = that.allowImportExportEverywhere;
+		this.preserveParens = that.preserveParens;
+		this.mozExtensions = that.mozExtensions;
+		this.jscript = that.jscript;
+		this.esnext = that.esnext;
+		this.v8Extensions = that.v8Extensions;
+		this.ecmaVersion = that.ecmaVersion;
+		this.allowReserved = that.allowReserved;
+		this.sourceType = that.sourceType;
+		this.onInsertedSemicolon = that.onInsertedSemicolon;
+		this.onTrailingComma = that.onTrailingComma;
+		this.onToken = that.onToken;
+		this.onComment = that.onComment;
+		this.program = that.program;
+		this.onRecoverableError = that.onRecoverableError;
+	}
+
+	public boolean allowHashBang() {
+		return allowHashBang;
+	}
+
+	public boolean allowReturnOutsideFunction() {
+		return allowReturnOutsideFunction;
+	}
+
+	public boolean allowImportExportEverywhere() {
+		return allowImportExportEverywhere;
+	}
+
+	public boolean preserveParens() {
+		return preserveParens;
+	}
+
+	public boolean mozExtensions() {
+		return mozExtensions;
+	}
+
+	public boolean jscript() {
+		return jscript;
+	}
+
+	public boolean esnext() {
+		return esnext;
+	}
+
+	public boolean v8Extensions() {
+		return v8Extensions;
+	}
+
+	public Identifiers.Dialect getDialect() {
+		switch (ecmaVersion) {
+		case 3:
+			return Dialect.ECMA_3;
+		case 5:
+			return Dialect.ECMA_5;
+		case 6:
+			return Dialect.ECMA_6;
+		case 8:
+			return Dialect.ECMA_8;
+		default:
+			return Dialect.ECMA_7;
+		}
+	}
+
+	public int ecmaVersion() {
+		return ecmaVersion;
+	}
+
+	public Options ecmaVersion(int ecmaVersion) {
+		if (ecmaVersion >= 2015)
+			ecmaVersion -= 2009;
+
+		this.ecmaVersion = ecmaVersion;
+		if (ecmaVersion >= 5)
+			this.allowReserved = AllowReserved.NO;
+		return this;
+	}
+
+	public AllowReserved allowReserved() {
+		return allowReserved;
+	}
+
+	public Options onComment(List<Comment> comments) {
+		this.onComment = (block, input, text, start, end, startLoc, endLoc) -> {
+			String src = input.substring(start, end);
+			comments.add(new Comment(new SourceLocation(src, startLoc, endLoc), text));
+		};
+		return this;
+	}
+
+	public String sourceType() {
+		return sourceType;
+	}
+
+	public Options sourceType(String sourceType) {
+		this.sourceType = sourceType;
+		return this;
+	}
+
+	public Options mozExtensions(boolean mozExtensions) {
+		this.mozExtensions = mozExtensions;
+		return this;
+	}
+
+	public Options jscript(boolean jscript) {
+		this.jscript = jscript;
+		return this;
+	}
+
+	public Options esnext(boolean esnext) {
+		this.esnext = esnext;
+		return this;
+	}
+
+	public void v8Extensions(boolean v8Extensions) {
+		this.v8Extensions = v8Extensions;
+	}
+
+	public Options preserveParens(boolean preserveParens) {
+		this.preserveParens = preserveParens;
+		return this;
+	}
+
+	public Options allowReturnOutsideFunction(boolean allowReturnOutsideFunction) {
+		this.allowReturnOutsideFunction = allowReturnOutsideFunction;
+		return this;
+	}
+
+	public Options allowImportExportEverywhere(boolean allowImportExportEverywhere) {
+		this.allowImportExportEverywhere = allowImportExportEverywhere;
+		return this;
+	}
+
+	public BiFunction<Integer, Position, Void> onInsertedSemicolon() {
+		return onInsertedSemicolon;
+	}
+
+	public BiFunction<Integer, Position, Void> onTrailingComma() {
+		return onTrailingComma;
+	}
+
+	public Function<Token, Void> onToken() {
+		return onToken;
+	}
+
+	public Options onToken(List<Token> tokens) {
+		return onToken((tk) -> { tokens.add(tk); return null; });
+	}
+
+	public Options onToken(Function<Token, Void> tmp) {
+		this.onToken = tmp;
+		return this;
+	}
+
+	public OnCommentCallback onComment() {
+		return onComment;
+	}
+
+	public Program program() {
+		return program;
+	}
+
+	public Options onRecoverableError(Function<SyntaxError, ?> onRecoverableError) {
+		this.onRecoverableError = onRecoverableError;
+		return this;
+	}
+
+	public Function<SyntaxError, ?> onRecoverableError() {
+		return onRecoverableError;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/Parser.java b/javascript/extractor/src/com/semmle/jcorn/Parser.java
new file mode 100644
index 00000000000..a8b964e330d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/Parser.java
@@ -0,0 +1,3547 @@
+package com.semmle.jcorn;
+
+import static com.semmle.jcorn.Whitespace.isNewLine;
+import static com.semmle.jcorn.Whitespace.lineBreak;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.Stack;
+import java.util.function.Function;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.semmle.jcorn.Identifiers.Dialect;
+import com.semmle.jcorn.Options.AllowReserved;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.ArrowFunctionExpression;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.AssignmentPattern;
+import com.semmle.js.ast.AwaitExpression;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.BreakStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.ConditionalExpression;
+import com.semmle.js.ast.ContinueStatement;
+import com.semmle.js.ast.DebuggerStatement;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.EmptyStatement;
+import com.semmle.js.ast.EnhancedForStatement;
+import com.semmle.js.ast.ExportAllDeclaration;
+import com.semmle.js.ast.ExportDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.ForInStatement;
+import com.semmle.js.ast.ForOfStatement;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.FunctionExpression;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IPattern;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportDefaultSpecifier;
+import com.semmle.js.ast.ImportNamespaceSpecifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.LogicalExpression;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.DeclarationFlags;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.MethodDefinition;
+import com.semmle.js.ast.NewExpression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectExpression;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.RestElement;
+import com.semmle.js.ast.ReturnStatement;
+import com.semmle.js.ast.SequenceExpression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Super;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TaggedTemplateExpression;
+import com.semmle.js.ast.TemplateElement;
+import com.semmle.js.ast.TemplateLiteral;
+import com.semmle.js.ast.ThisExpression;
+import com.semmle.js.ast.ThrowStatement;
+import com.semmle.js.ast.Token;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.ast.YieldExpression;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.util.collections.CollectionUtil;
+import com.semmle.util.data.Pair;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.exception.CatastrophicError;
+import com.semmle.util.io.WholeIO;
+
+/**
+ * Java port of Acorn.
+ *
+ * This version corresponds to <a href="https://github.com/ternjs/acorn/commit/bb54adcdbceef01997a9549732139ca8f53a4e28">Acorn 4.0.3</a>,
+ * but does not support plugins, and always tracks full source locations.
+ */
+public class Parser {
+	protected final Options options;
+	protected final Set<String> keywords;
+	private final Set<String> reservedWords, reservedWordsStrict, reservedWordsStrictBind;
+	protected final String input;
+	private boolean containsEsc;
+	protected boolean exprAllowed;
+	protected boolean strict;
+	private boolean inModule;
+	protected boolean inFunction;
+	protected boolean inGenerator;
+	protected boolean inAsync;
+	protected boolean inTemplateElement;
+	protected int pos;
+	protected int lineStart;
+	protected int curLine;
+	protected int start;
+	protected int end;
+	protected TokenType type;
+	protected Object value;
+	protected Position startLoc;
+	protected Position endLoc;
+	protected Position lastTokEndLoc, lastTokStartLoc;
+	protected int lastTokStart, lastTokEnd;
+	protected Stack<TokContext> context;
+	protected int potentialArrowAt;
+	private Stack<LabelInfo> labels;
+	protected int yieldPos, awaitPos;
+
+	/**
+	 * For readability purposes, we pass this instead of false as the argument to
+	 * the hasDeclareKeyword parameter (which only exists in TypeScript).
+	 */
+	private static final boolean noDeclareKeyword = false;
+
+	/**
+	 * For readability purposes, we pass this instead of false as the argument to
+	 * the isAbstract parameter (which only exists in TypeScript).
+	 */
+	protected static final boolean notAbstract = false;
+
+	/**
+	 * For readability purposes, we pass this instead of null as the argument to the
+	 * type annotation parameters (which only exists in TypeScript).
+	 */
+	private static final ITypeExpression noTypeAnnotation = null;
+
+	protected static class LabelInfo {
+		String name, kind;
+		int statementStart;
+
+		public LabelInfo(String name, String kind, int statementStart) {
+			this.name = name;
+			this.kind = kind;
+			this.statementStart = statementStart;
+		}
+	}
+
+	public static void main(String[] args) {
+		new Parser(new Options(), new WholeIO().strictread(new File(args[0])), 0).parse();
+	}
+
+	/// begin state.js
+
+	public Parser(Options options, String input, int startPos) {
+		this.options = options;
+		this.keywords = new LinkedHashSet<String>(Identifiers.keywords.get(options.ecmaVersion() >= 6 ? Identifiers.Dialect.ECMA_6 : Identifiers.Dialect.ECMA_5));
+		this.reservedWords = new LinkedHashSet<String>();
+		if (!options.allowReserved().isTrue()) {
+			this.reservedWords.addAll(Identifiers.reservedWords.get(options.getDialect()));
+			if (options.sourceType().equals("module"))
+				this.reservedWords.add("await");
+		}
+		this.reservedWordsStrict = new LinkedHashSet<String>(this.reservedWords);
+		this.reservedWordsStrict.addAll(Identifiers.reservedWords.get(Dialect.STRICT));
+		this.reservedWordsStrictBind = new LinkedHashSet<String>(this.reservedWordsStrict);
+		this.reservedWordsStrictBind.addAll(Identifiers.reservedWords.get(Dialect.STRICT_BIND));
+		this.input = input;
+
+		// Used to signal to callers of `readWord1` whether the word
+		// contained any escape sequences. This is needed because words with
+		// escape sequences must not be interpreted as keywords.
+		this.containsEsc = false;
+
+		// Set up token state
+
+		// The current position of the tokenizer in the input.
+		if (startPos != 0) {
+			this.pos = startPos;
+			this.lineStart = this.input.lastIndexOf("\n", startPos - 1) + 1;
+			this.curLine = inputSubstring(0, this.lineStart).split(Whitespace.lineBreak).length;
+		} else {
+			this.pos = this.lineStart = 0;
+			this.curLine = 1;
+		}
+
+		// Properties of the current token:
+		// Its type
+		this.type = TokenType.eof;
+		// For tokens that include more information than their type, the value
+		this.value = null;
+		// Its start and end offset
+		this.start = this.end = this.pos;
+		// And, if locations are used, the {line, column} object
+		// corresponding to those offsets
+		this.startLoc = this.endLoc = this.curPosition();
+
+		// Position information for the previous token
+		this.lastTokEndLoc = this.lastTokStartLoc = null;
+		this.lastTokStart = this.lastTokEnd = this.pos;
+
+		// The context stack is used to superficially track syntactic
+		// context to predict whether a regular expression is allowed in a
+		// given position.
+		this.context = this.initialContext();
+		this.exprAllowed = true;
+
+		// Figure out if it's a module code.
+		this.strict = this.inModule = options.sourceType().equals("module");
+
+		// Used to signify the start of a potential arrow function
+		this.potentialArrowAt = -1;
+
+		// Flags to track whether we are in a function, a generator, an async function.
+		this.inFunction = this.inGenerator = this.inAsync = false;
+		// Positions to delayed-check that yield/await does not exist in default parameters.
+		this.yieldPos = this.awaitPos = 0;
+		// Labels in scope.
+		this.labels = new Stack<LabelInfo>();
+
+		// If enabled, skip leading hashbang line.
+		if (this.pos == 0 && options.allowHashBang() && this.input.startsWith("#!"))
+			this.skipLineComment(2);
+	}
+
+	public Program parse() {
+		Position startLoc = this.startLoc;
+		this.nextToken();
+		return this.parseTopLevel(startLoc, this.options.program());
+	}
+
+	/// end state.js
+
+	/// begin location.js
+	protected void raise(int pos, String msg, boolean recoverable) {
+		Position loc = Locutil.getLineInfo(input, pos);
+		raise(loc, msg, recoverable);
+	}
+
+	protected void raise(int pos, String msg) {
+		raise(pos, msg, false);
+	}
+
+	protected void raise(Position loc, String msg, boolean recoverable) {
+		msg += " (" + loc.getLine() + ":" + loc.getColumn() + ")";
+		SyntaxError err = new SyntaxError(msg, loc, this.pos);
+		if (recoverable && options.onRecoverableError() != null)
+			options.onRecoverableError().apply(err);
+		else
+			throw err;
+	}
+
+	protected void raise(Position loc, String msg) {
+		raise(loc, msg, false);
+	}
+
+	protected void raise(INode nd, String msg) {
+		raise(nd.getLoc().getStart(), msg, false);
+	}
+
+	protected void raiseRecoverable(int pos, String msg) {
+		raise(pos, msg, true);
+	}
+
+	protected void raiseRecoverable(INode nd, String msg) {
+		raise(nd.getLoc().getStart(), msg, true);
+	}
+
+	protected Position curPosition() {
+		return new Position(curLine, pos - lineStart, pos);
+	}
+
+	/// end location.js
+
+	/// begin tokenize.js
+
+	// Move to the next token
+
+	protected void next() {
+		if (this.options.onToken() != null)
+			this.options.onToken().apply(mkToken());
+
+		this.lastTokEnd = this.end;
+		this.lastTokStart = this.start;
+		this.lastTokEndLoc = this.endLoc;
+		this.lastTokStartLoc = this.startLoc;
+		this.nextToken();
+	}
+
+	// Toggle strict mode. Re-reads the next number or string to please
+	// pedantic tests (`"use strict"; 010;` should fail).
+
+	public void setStrict(boolean strict) {
+		this.strict = strict;
+		if (this.type != TokenType.num && this.type != TokenType.string) return;
+		this.pos = this.start;
+		while (this.pos < this.lineStart) {
+			this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1;
+			--this.curLine;
+		}
+		this.nextToken();
+	}
+
+	public TokContext curContext() {
+		return context.peek();
+	}
+
+	// Read a single token, updating the parser object's token-related
+	// properties.
+
+	public Token nextToken() {
+		TokContext curContext = this.curContext();
+		if (curContext == null || !curContext.preserveSpace)
+			this.skipSpace();
+
+		this.start = this.pos;
+		this.startLoc = this.curPosition();
+		if (this.pos >= this.input.length())
+			return this.finishToken(TokenType.eof);
+
+		if (curContext != null && curContext.override != null)
+			return curContext.override.apply(this);
+		else
+			return this.readToken(this.fullCharCodeAtPos());
+	}
+
+	protected Token readToken(int code) {
+		// Identifier or keyword. '\\uXXXX' sequences are allowed in
+		// identifiers, so '\' also dispatches to that.
+		if (Identifiers.isIdentifierStart(code, this.options.ecmaVersion() >= 6) || code == 92 /* '\' */)
+			return this.readWord();
+
+		return this.getTokenFromCode(code);
+	}
+
+	protected int fullCharCodeAtPos() {
+		int code = charAt(this.pos);
+		if (code <= 0xd7ff || code >= 0xe000)
+			return code;
+		int next = charAt(this.pos + 1);
+		return (code << 10) + next - 0x35fdc00;
+	}
+
+	protected void skipBlockComment() {
+		Position startLoc = this.options.onComment() != null ? this.curPosition() : null;
+		int start = this.pos, end = this.input.indexOf("*/", this.pos += 2);
+		if (end == -1)
+			this.raise(this.pos - 2, "Unterminated comment");
+		this.pos = end + 2;
+		Matcher m = Whitespace.lineBreakG.matcher(this.input);
+		int next = start;
+		while (m.find(next) && m.start() < this.pos) {
+			++this.curLine;
+			lineStart = m.end();
+			next = lineStart;
+		}
+		if (this.options.onComment() != null)
+			this.options.onComment().call(true, this.input, inputSubstring(start + 2, end), start, this.pos,
+					startLoc, this.curPosition());
+	}
+
+	protected void skipLineComment(int startSkip) {
+		int start = this.pos;
+		Position startLoc = this.options.onComment() != null ? this.curPosition() : null;
+		this.pos += startSkip;
+		int ch = charAt(this.pos);
+		while (this.pos < this.input.length() && ch != 10 && ch != 13 && ch != 8232 && ch != 8233) {
+			++this.pos;
+			ch = charAt(this.pos);
+		}
+		if (this.options.onComment() != null)
+			this.options.onComment().call(false, this.input, inputSubstring(start + startSkip, this.pos), start, this.pos,
+					startLoc, this.curPosition());
+	}
+
+	// Called at the start of the parse and after every token. Skips
+	// whitespace and comments, and.
+
+	protected void skipSpace() {
+		loop: while (this.pos < this.input.length()) {
+			int ch = this.input.charAt(this.pos);
+			switch (ch) {
+			case 32: case 160: // ' '
+				++this.pos;
+				break;
+			case 13:
+				if (charAt(this.pos + 1) == 10) {
+					++this.pos;
+				}
+			case 10: case 8232: case 8233:
+				++this.pos;
+				++this.curLine;
+				this.lineStart = this.pos;
+				break;
+			case 47: // '/'
+				switch (charAt(this.pos + 1)) {
+				case 42: // '*'
+					this.skipBlockComment();
+					break;
+				case 47:
+					this.skipLineComment(2);
+					break;
+				default:
+					break loop;
+				}
+				break;
+			default:
+				if (ch > 8 && ch < 14 || ch >= 5760 && Whitespace.nonASCIIwhitespace.indexOf(ch) > -1) {
+					++this.pos;
+				} else {
+					break loop;
+				}
+			}
+		}
+	}
+
+	// Called at the end of every token. Sets `end`, `val`, and
+	// maintains `context` and `exprAllowed`, and skips the space after
+	// the token, so that the next one's `start` will point at the
+	// right position.
+
+	protected Token finishToken(TokenType type, Object val) {
+		this.end = this.pos;
+		this.endLoc = this.curPosition();
+		TokenType prevType = this.type;
+		this.type = type;
+		this.value = val;
+		this.updateContext(prevType);
+		return mkToken();
+	}
+
+	private Token mkToken() {
+		String src = inputSubstring(start, end);
+		SourceLocation loc = new SourceLocation(src, startLoc, endLoc);
+		String label, keyword;
+		if (isKeyword(src)) {
+			label = keyword = src;
+		} else {
+			label = type.label;
+			keyword = type.keyword;
+		}
+		return new Token(loc, label, keyword);
+	}
+
+	protected boolean isKeyword(String src) {
+		if (type.keyword != null)
+			return true;
+		if (type == TokenType.name) {
+			if (keywords.contains(src))
+				return true;
+			if (options.ecmaVersion() >= 6 && ("let".equals(src) || "yield".equals(src)))
+				return true;
+		}
+		return false;
+	}
+
+	protected Token finishToken(TokenType type) {
+		return finishToken(type, null);
+	}
+
+	// ### Token reading
+
+	// This is the function that is called to fetch the next token. It
+	// is somewhat obscure, because it works in character codes rather
+	// than characters, and because operator parsing has been inlined
+	// into it.
+	//
+	// All in the name of speed.
+	//
+	private Token readToken_dot() {
+		int next = charAt(this.pos + 1);
+		if (next >= 48 && next <= 57) return this.readNumber(true);
+		int next2 = charAt(this.pos + 2);
+		if (this.options.ecmaVersion() >= 6 && next == 46 && next2 == 46) { // 46 = dot '.'
+			this.pos += 3;
+			return this.finishToken(TokenType.ellipsis);
+		} else {
+			++this.pos;
+			return this.finishToken(TokenType.dot);
+		}
+	}
+
+	private Token readToken_slash() { // '/'
+		int next = charAt(this.pos + 1);
+		if (this.exprAllowed) {
+			++this.pos;
+			return this.readRegexp();
+		}
+		if (next == 61)
+			return this.finishOp(TokenType.assign, 2);
+		return this.finishOp(TokenType.slash, 1);
+	}
+
+	private Token readToken_mult_modulo_exp(int code) { // '%*'
+		int next = charAt(this.pos + 1);
+		int size = 1;
+		TokenType tokentype = code == 42 ? TokenType.star : TokenType.modulo;
+
+		// exponentiation operator ** and **=
+		if (this.options.ecmaVersion() >= 7 && code == 42 && next == 42) {
+			++size;
+			tokentype = TokenType.starstar;
+			next = charAt(this.pos + 2);
+		}
+
+		if (next == 61)
+			return this.finishOp(TokenType.assign, size + 1);
+		return this.finishOp(tokentype, size);
+	}
+
+	private Token readToken_pipe_amp(int code) { // '|&'
+		int next = charAt(this.pos + 1);
+		if (next == code)
+			return this.finishOp(code == 124 ? TokenType.logicalOR : TokenType.logicalAND, 2);
+		if (next == 61)
+			return this.finishOp(TokenType.assign, 2);
+		return this.finishOp(code == 124 ? TokenType.bitwiseOR : TokenType.bitwiseAND, 1);
+	}
+
+	private Token readToken_caret() { // '^'
+		int next = charAt(this.pos + 1);
+		if (next == 61)
+			return this.finishOp(TokenType.assign, 2);
+		return this.finishOp(TokenType.bitwiseXOR, 1);
+	}
+
+	private Token readToken_plus_min(int code) { // '+-'
+		int next = charAt(this.pos + 1);
+		if (next == code) {
+			if (next == 45 && charAt(this.pos + 2) == 62 &&
+					inputSubstring(this.lastTokEnd, this.pos).matches("(?s).*(?:" + lineBreak + ").*")) {
+				// A `-->` line comment
+				this.skipLineComment(3);
+				this.skipSpace();
+				return this.nextToken();
+			}
+			return this.finishOp(TokenType.incDec, 2);
+		}
+		if (next == 61)
+			return this.finishOp(TokenType.assign, 2);
+		return this.finishOp(TokenType.plusMin, 1);
+	}
+
+	private Token readToken_lt_gt(int code) { // '<>'
+		int next = charAt(this.pos + 1);
+		int size = 1;
+		if (next == code) {
+			size = code == 62 && charAt(this.pos + 2) == 62 ? 3 : 2;
+			if (charAt(this.pos + size) == 61)
+				return this.finishOp(TokenType.assign, size + 1);
+			return this.finishOp(TokenType.bitShift, size);
+		}
+		if (next == 33 && code == 60 && charAt(this.pos + 2) == 45 &&
+				charAt(this.pos + 3) == 45) {
+			if (this.inModule)
+				this.unexpected();
+			// `<!--`, an XML-style comment that should be interpreted as a line comment
+			this.skipLineComment(4);
+			this.skipSpace();
+			return this.nextToken();
+		}
+		if (next == 61)
+			size = 2;
+		return this.finishOp(TokenType.relational, size);
+	}
+
+	private Token readToken_eq_excl(int code) { // '=!'
+		int next = charAt(this.pos + 1);
+		if (next == 61)
+			return this.finishOp(TokenType.equality, charAt(this.pos + 2) == 61 ? 3 : 2);
+		if (code == 61 && next == 62 && this.options.ecmaVersion() >= 6) { // '=>'
+			this.pos += 2;
+			return this.finishToken(TokenType.arrow);
+		}
+		return this.finishOp(code == 61 ? TokenType.eq : TokenType.prefix, 1);
+	}
+
+	protected Token getTokenFromCode(int code) {
+		switch (code) {
+		// The interpretation of a dot depends on whether it is followed
+		// by a digit or another two dots.
+		case 46: // '.'
+			return this.readToken_dot();
+
+			// Punctuation tokens.
+		case 40: ++this.pos; return this.finishToken(TokenType.parenL);
+		case 41: ++this.pos; return this.finishToken(TokenType.parenR);
+		case 59: ++this.pos; return this.finishToken(TokenType.semi);
+		case 44: ++this.pos; return this.finishToken(TokenType.comma);
+		case 91: ++this.pos; return this.finishToken(TokenType.bracketL);
+		case 93: ++this.pos; return this.finishToken(TokenType.bracketR);
+		case 123: ++this.pos; return this.finishToken(TokenType.braceL);
+		case 125: ++this.pos; return this.finishToken(TokenType.braceR);
+		case 58: ++this.pos; return this.finishToken(TokenType.colon);
+		case 63: ++this.pos; return this.finishToken(TokenType.question);
+
+		case 96: // '`'
+			if (this.options.ecmaVersion() < 6) break;
+			++this.pos;
+			return this.finishToken(TokenType.backQuote);
+
+		case 48: // '0'
+			int next = charAt(this.pos + 1);
+			if (next == 120 || next == 88) return this.readRadixNumber(16); // '0x', '0X' - hex number
+			if (this.options.ecmaVersion() >= 6) {
+				if (next == 111 || next == 79) return this.readRadixNumber(8); // '0o', '0O' - octal number
+				if (next == 98 || next == 66) return this.readRadixNumber(2); // '0b', '0B' - binary number
+			}
+			// Anything else beginning with a digit is an integer, octal
+			// number, or float.
+		case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
+			return this.readNumber(false);
+
+			// Quotes produce strings.
+		case 34: case 39: // '"', "'"
+			return this.readString((char)code);
+
+			// Operators are parsed inline in tiny state machines. '=' (61) is
+			// often referred to. `finishOp` simply skips the amount of
+			// characters it is given as second argument, and returns a token
+			// of the type given by its first argument.
+
+		case 47: // '/'
+			return this.readToken_slash();
+
+		case 37: case 42: // '%*'
+			return this.readToken_mult_modulo_exp(code);
+
+		case 124: case 38: // '|&'
+			return this.readToken_pipe_amp(code);
+
+		case 94: // '^'
+			return this.readToken_caret();
+
+		case 43: case 45: // '+-'
+			return this.readToken_plus_min(code);
+
+		case 60: case 62: // '<>'
+			return this.readToken_lt_gt(code);
+
+		case 61: case 33: // '=!'
+			return this.readToken_eq_excl(code);
+
+		case 126: // '~'
+			return this.finishOp(TokenType.prefix, 1);
+		}
+
+		this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'");
+		return null;
+	}
+
+	protected Token finishOp(TokenType type, int size) {
+		String str = inputSubstring(this.pos, this.pos + size);
+		this.pos += size;
+		return this.finishToken(type, str);
+	}
+
+	private Token readRegexp() {
+		boolean escaped = false, inClass = false;
+		int start = this.pos;
+		for (;;) {
+			if (this.pos >= this.input.length())
+				this.raise(start, "Unterminated regular expression");
+			int ch = this.input.charAt(this.pos);
+			if (isNewLine(ch))
+				this.raise(start, "Unterminated regular expression");
+			if (!escaped) {
+				if (ch == '[')
+					inClass = true;
+				else if (ch == ']' && inClass)
+					inClass = false;
+				else if (ch == '/' && !inClass)
+					break;
+				escaped = ch == '\\';
+			} else {
+				escaped = false;
+			}
+			++this.pos;
+		}
+		String content = inputSubstring(start, this.pos);
+		++this.pos;
+		// Need to use `readWord1` because '\\uXXXX' sequences are allowed
+		// here (don't ask).
+		String mods = this.readWord1();
+		if (mods != null) {
+			String validFlags = "gim";
+			if (this.options.ecmaVersion() >= 6) validFlags = "gimuy";
+			if (this.options.ecmaVersion() >= 9) validFlags = "gimsuy";
+			if (!mods.matches("^[" + validFlags + "]*$"))
+				this.raise(start, "Invalid regular expression flag");
+			if (mods.indexOf('u') >= 0) {
+				Matcher m = Pattern.compile("\\\\u\\{([0-9a-fA-F]+)\\}").matcher(content);
+				while (m.find()) {
+					try {
+						int code = Integer.parseInt(m.group(1), 16);
+						if (code > 0x10FFFF)
+							this.raiseRecoverable(start + m.start() + 3, "Code point out of bounds");
+					} catch (NumberFormatException nfe) {
+						Exceptions.ignore(nfe, "Don't complain about code points we don't understand.");
+					}
+				}
+			}
+		}
+		return this.finishToken(TokenType.regexp, content);
+	}
+
+	// Read an integer in the given radix. Return null if zero digits
+	// were read, the integer value otherwise. When `len` is given, this
+	// will return `null` unless the integer has exactly `len` digits.
+	protected Number readInt(int radix, Integer len) {
+		int start = this.pos;
+		double total = 0;
+		for (int i = 0, e = len == null ? Integer.MAX_VALUE : len; i < e; ++i) {
+			if (this.pos >= this.input.length())
+				break;
+			int code = this.input.charAt(this.pos), val;
+			if (code >= 97) val = code - 97 + 10; // a
+			else if (code >= 65) val = code - 65 + 10; // A
+			else if (code >= 48 && code <= 57) val = code - 48; // 0-9
+			else val = Integer.MAX_VALUE;
+			if (val >= radix) break;
+			++this.pos;
+			total = total * radix + val;
+		}
+		if (this.pos == start || len != null && this.pos - start != len) return null;
+
+		return total;
+	}
+
+	protected Token readRadixNumber(int radix) {
+		this.pos += 2; // 0x
+		Number val = this.readInt(radix, null);
+		if (val == null)
+			this.raise(this.start + 2, "Expected number in radix " + radix);
+
+		// check for bigint literal
+		if (options.esnext() && this.fullCharCodeAtPos() == 'n') {
+			++this.pos;
+			return this.finishToken(TokenType.bigint, val);
+		}
+
+		if (Identifiers.isIdentifierStart(this.fullCharCodeAtPos(), false))
+			this.raise(this.pos, "Identifier directly after number");
+		return this.finishToken(TokenType.num, val);
+	}
+
+	// Read an integer, octal integer, or floating-point number.
+	protected Token readNumber(boolean startsWithDot) {
+		int start = this.pos;
+		boolean isFloat = false, octal = charAt(this.pos) == 48, isBigInt = false;
+		if (!startsWithDot && this.readInt(10, null) == null)
+			this.raise(start, "Invalid number");
+		if (octal && this.pos == start + 1)
+			octal = false;
+
+		if (this.pos < this.input.length()) {
+			int next = this.input.charAt(this.pos);
+			if (next == 46 && !octal) { // '.'
+				++this.pos;
+				this.readInt(10, null);
+				isFloat = true;
+				next = charAt(this.pos);
+			}
+			if ((next == 69 || next == 101) && !octal) { // 'eE'
+				next = charAt(++this.pos);
+				if (next == 43 || next == 45)
+					++this.pos; // '+-'
+				if (this.readInt(10, null) == null)
+					this.raise(start, "Invalid number");
+				isFloat = true;
+			}
+			if (!isFloat && options.esnext() && this.fullCharCodeAtPos() == 'n')
+				isBigInt = true;
+			else if (Identifiers.isIdentifierStart(this.fullCharCodeAtPos(), false))
+				this.raise(this.pos, "Identifier directly after number");
+		}
+
+		String str = inputSubstring(start, this.pos);
+		Number val = null;
+		if (isFloat)
+			val = parseFloat(str);
+		else if (!octal || str.length() == 1)
+			val = parseInt(str, 10);
+		else if (str.matches(".*[89].*") || this.strict)
+			this.raise(start, "Invalid number");
+		else
+			val = parseInt(str, 8);
+
+		// handle bigints
+		if (isBigInt) {
+			++this.pos;
+			return this.finishToken(TokenType.bigint, val);
+		}
+
+		return this.finishToken(TokenType.num, val);
+	}
+
+	// Read a string value, interpreting backslash-escapes.
+	protected int readCodePoint() {
+		int ch = charAt(this.pos), code;
+
+		if (ch == 123) {
+			if (this.options.ecmaVersion() < 6)
+				this.unexpected();
+			int codePos = ++this.pos;
+			code = this.readHexChar(this.input.indexOf('}', this.pos) - this.pos);
+			++this.pos;
+			if (code > 0x10FFFF)
+				this.invalidStringToken(codePos, "Code point out of bounds");
+		} else {
+			code = this.readHexChar(4);
+		}
+		return code;
+	}
+
+	protected String codePointToString(int code) {
+		// UTF-16 Decoding
+		if (code <= 0xFFFF)
+			return String.valueOf((char)code);
+		code -= 0x10000;
+		return new String(new char[] {
+				(char)((code >> 10) + 0xD800),
+				(char)((code & 1023) + 0xDC00)
+		});
+	}
+
+	protected Token readString(char quote) {
+		StringBuilder out = new StringBuilder();
+		int chunkStart = ++this.pos;
+		for (;;) {
+			if (this.pos >= this.input.length())
+				this.raise(this.start, "Unterminated string constant");
+			int ch = this.input.charAt(this.pos);
+			if (ch == quote)
+				break;
+			if (ch == 92) { // '\'
+				out.append(inputSubstring(chunkStart, this.pos));
+				out.append(this.readEscapedChar(false));
+				chunkStart = this.pos;
+			} else {
+				if (Whitespace.isNewLine(ch))
+					this.raise(this.start, "Unterminated string constant");
+				++this.pos;
+			}
+		}
+		out.append(inputSubstring(chunkStart, this.pos++));
+		return this.finishToken(TokenType.string, out.toString());
+	}
+
+	// Reads template string tokens.
+	private static final RuntimeException INVALID_TEMPLATE_ESCAPE_ERROR = new RuntimeException();
+
+	private Token tryReadTemplateToken() {
+		this.inTemplateElement = true;
+		try {
+			return this.readTmplToken();
+		} catch (RuntimeException err) {
+			if (err == INVALID_TEMPLATE_ESCAPE_ERROR) {
+				return this.readInvalidTemplateToken();
+			} else {
+				throw err;
+			}
+		} finally {
+			this.inTemplateElement = false;
+		}
+	}
+
+	private void invalidStringToken(int position, String message) {
+		if (this.inTemplateElement && this.options.ecmaVersion() >= 9) {
+			throw INVALID_TEMPLATE_ESCAPE_ERROR;
+		} else {
+			this.raise(position, message);
+		}
+	}
+
+	protected Token readTmplToken() {
+		StringBuilder out = new StringBuilder();
+		int chunkStart = this.pos;
+		for (;;) {
+			if (this.pos >= this.input.length())
+				this.raise(this.start, "Unterminated template");
+			int ch = this.input.charAt(this.pos);
+			if (ch == 96 || ch == 36 && charAt(this.pos + 1) == 123) { // '`', '${'
+				if (this.pos == this.start && (this.type == TokenType.template || this.type == TokenType.invalidTemplate)) {
+					if (ch == 36) {
+						this.pos += 2;
+						return this.finishToken(TokenType.dollarBraceL);
+					} else {
+						++this.pos;
+						return this.finishToken(TokenType.backQuote);
+					}
+				}
+				out.append(inputSubstring(chunkStart, this.pos));
+				return this.finishToken(TokenType.template, out.toString());
+			}
+			if (ch == 92) { // '\'
+				out.append(inputSubstring(chunkStart, this.pos));
+				out.append(this.readEscapedChar(true));
+				chunkStart = this.pos;
+			} else if (Whitespace.isNewLine(ch)) {
+				out.append(inputSubstring(chunkStart, this.pos));
+				++this.pos;
+				switch (ch) {
+				case 13:
+					if (charAt(this.pos) == 10)
+						++this.pos;
+				case 10:
+					out.append('\n');
+					break;
+				default:
+					out.append((char)ch);
+					break;
+				}
+				++this.curLine;
+				this.lineStart = this.pos;
+				chunkStart = this.pos;
+			} else {
+				++this.pos;
+			}
+		}
+	}
+
+	// Reads a template token to search for the end, without validating any escape sequences
+	private Token readInvalidTemplateToken() {
+		for (; this.pos < this.input.length(); this.pos++) {
+			switch (this.input.charAt(this.pos)) {
+			case '\\':
+				++this.pos;
+				break;
+
+			case '$':
+				if (this.charAt(this.pos + 1) != '{') {
+					break;
+				}
+				// falls through
+
+			case '`':
+				return this.finishToken(TokenType.invalidTemplate, this.inputSubstring(this.start, this.pos));
+
+			// no default
+			}
+		}
+
+		this.raise(this.start, "Unterminated template");
+		return null;
+	}
+
+	// Used to read escaped characters
+	protected String readEscapedChar(boolean inTemplate) {
+		int ch = charAt(++this.pos);
+		++this.pos;
+		switch (ch) {
+		case 110: return "\n"; // 'n' -> '\n'
+		case 114: return "\r"; // 'r' -> '\r'
+		case 120: return String.valueOf((char)this.readHexChar(2)); // 'x'
+		case 117: return codePointToString(this.readCodePoint()); // 'u'
+		case 116: return "\t"; // 't' -> '\t'
+		case 98: return "\b"; // 'b' -> '\b'
+		case 118: return "\u000b"; // 'v' -> '\u000b'
+		case 102: return "\f"; // 'f' -> '\f'
+		case 13: if (charAt(this.pos) == 10) ++this.pos; // '\r\n'
+		case 10: // ' \n'
+			this.lineStart = this.pos; ++this.curLine;
+			return "";
+		default:
+			if (ch >= 48 && ch <= 55) {
+				String octalStr = inputSubstring(this.pos - 1, this.pos + 2);
+				Matcher m = Pattern.compile("^[0-7]+").matcher(octalStr);
+				m.find();
+				octalStr = m.group();
+				int octal = parseInt(octalStr, 8).intValue();
+				if (octal > 255) {
+					octalStr = octalStr.substring(0, octalStr.length()-1);
+					octal = parseInt(octalStr, 8).intValue();
+				}
+				if (!octalStr.equals("0") && (this.strict || inTemplate)) {
+					this.invalidStringToken(this.pos - 2, "Octal literal in strict mode");
+				}
+				this.pos += octalStr.length() - 1;
+				return String.valueOf((char)octal);
+			}
+			return String.valueOf((char)ch);
+		}
+	}
+
+	// Used to read character escape sequences ('\x', '\\u', '\U').
+	protected int readHexChar(int len) {
+		int codePos = this.pos;
+		Number n = this.readInt(16, len);
+		if (n == null)
+			this.invalidStringToken(codePos, "Bad character escape sequence");
+		return n.intValue();
+	}
+
+	// Read an identifier, and return it as a string. Sets `this.containsEsc`
+	// to whether the word contained a '\\u' escape.
+	//
+	// Incrementally adds only escaped chars, adding other chunks as-is
+	// as a micro-optimization.
+	protected String readWord1() {
+		this.containsEsc = false;
+		String word = "";
+		boolean first = true;
+		int chunkStart = this.pos;
+		boolean astral = this.options.ecmaVersion() >= 6;
+		while (this.pos < this.input.length()) {
+			int ch = this.fullCharCodeAtPos();
+			if (Identifiers.isIdentifierChar(ch, astral)) {
+				this.pos += ch <= 0xffff ? 1 : 2;
+			} else if (ch == 92) { // "\"
+				this.containsEsc = true;
+				word += inputSubstring(chunkStart, this.pos);
+				int escStart = this.pos;
+				if (charAt(++this.pos) != 117) // "u"
+					this.invalidStringToken(this.pos, "Expecting Unicode escape sequence \\uXXXX");
+				++this.pos;
+				int esc = this.readCodePoint();
+				if (!(first ? Identifiers.isIdentifierStart(esc, astral) : Identifiers.isIdentifierChar(esc, astral)))
+					this.invalidStringToken(escStart, "Invalid Unicode escape");
+				word += codePointToString(esc);
+				chunkStart = this.pos;
+			} else {
+				break;
+			}
+			first = false;
+		}
+		return word + inputSubstring(chunkStart, this.pos);
+	}
+
+	// Read an identifier or keyword token. Will check for reserved
+	// words when necessary.
+	protected Token readWord() {
+		String word = this.readWord1();
+		TokenType type = TokenType.name;
+		if ((this.options.ecmaVersion() >= 6 || !this.containsEsc) && this.keywords.contains(word))
+			type = TokenType.keywords.get(word);
+		return this.finishToken(type, word);
+	}
+
+	/// end tokenize.js
+
+	/// begin parseutil.js
+
+	// ## Parser utilities
+
+	// Test whether a statement node is the string literal `"use strict"`.
+	protected boolean isUseStrict(Statement stmt) {
+		if (!(this.options.ecmaVersion() >= 5 && stmt instanceof ExpressionStatement))
+			return false;
+		Expression e = ((ExpressionStatement) stmt).getExpression();
+		if (!(e instanceof Literal))
+			return false;
+		String raw = ((Literal) e).getRaw();
+		return raw.length() >= 2 && raw.substring(1, raw.length()-1).equals("use strict");
+	}
+
+	// Predicate that tests whether the next token is of the given
+	// type, and if yes, consumes it as a side effect.
+	protected boolean eat(TokenType type) {
+		if (this.type == type) {
+			this.next();
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	// Tests whether parsed token is a contextual keyword.
+	protected boolean isContextual(String name) {
+		return this.type == TokenType.name && Objects.equals(this.value, name);
+	}
+
+	// Consumes contextual keyword if possible.
+	protected boolean eatContextual(String name) {
+		return Objects.equals(this.value, name) && this.eat(TokenType.name);
+	}
+
+	// Asserts that following token is given contextual keyword.
+	protected void expectContextual(String name) {
+		if (!this.eatContextual(name))
+			this.unexpected();
+	}
+
+	private static final Pattern CONTAINS_LINEBREAK = Pattern.compile("(?s).*(?:" + lineBreak + ").*");
+
+	// Test whether a semicolon can be inserted at the current position.
+	protected boolean canInsertSemicolon() {
+		return this.type == TokenType.eof ||
+				this.type == TokenType.braceR ||
+				CONTAINS_LINEBREAK.matcher(inputSubstring(this.lastTokEnd, this.start)).matches();
+	}
+
+	protected boolean insertSemicolon() {
+		if (this.canInsertSemicolon()) {
+			if (this.options.onInsertedSemicolon() != null)
+				this.options.onInsertedSemicolon().apply(this.lastTokEnd, this.lastTokEndLoc);
+			return true;
+		}
+		return false;
+	}
+
+	// Consume a semicolon, or, failing that, see if we are allowed to
+	// pretend that there is a semicolon at this position.
+	protected void semicolon() {
+		if (!this.eat(TokenType.semi) && !this.insertSemicolon())
+			this.unexpected();
+	}
+
+	protected boolean afterTrailingComma(TokenType tokType, boolean notNext) {
+		if (this.type == tokType) {
+			if (this.options.onTrailingComma() != null)
+				this.options.onTrailingComma().apply(this.lastTokStart, this.lastTokStartLoc);
+			if (!notNext)
+				this.next();
+			return true;
+		}
+		return false;
+	}
+
+	// Expect a token of a given type. If found, consume it, otherwise,
+	// raise an unexpected token error.
+	protected void expect(TokenType type) {
+		if (!this.eat(type))
+			this.unexpected();
+	}
+
+	// Raise an unexpected token error.
+	protected void unexpected(Integer pos) {
+		this.raise(pos != null ? pos : this.start, "Unexpected token");
+	}
+
+	protected void unexpected(Position pos) {
+		this.raise(pos, "Unexpected token");
+	}
+
+	protected void unexpected() {
+		unexpected((Integer)null);
+	}
+
+	public static class DestructuringErrors {
+		private int shorthandAssign, trailingComma;
+
+		public void reset() {
+			this.shorthandAssign = 0;
+			this.trailingComma = 0;
+		}
+	}
+
+	protected boolean checkPatternErrors(DestructuringErrors refDestructuringErrors, boolean andThrow) {
+		int trailing = refDestructuringErrors != null ? refDestructuringErrors.trailingComma : 0;
+		if (!andThrow)
+			return trailing != 0;
+		if (trailing != 0)
+			this.raise(trailing, "Comma is not permitted after the rest element");
+		return false;
+	}
+
+	protected boolean checkExpressionErrors(DestructuringErrors refDestructuringErrors, boolean andThrow) {
+		int pos = refDestructuringErrors != null ? refDestructuringErrors.shorthandAssign : 0;
+		if (!andThrow)
+			return pos != 0;
+		if (pos != 0)
+			this.raise(pos, "Shorthand property assignments are valid only in destructuring patterns");
+		return false;
+	}
+
+	private void checkYieldAwaitInDefaultParams() {
+		if (this.yieldPos > 0 && (this.awaitPos == 0 || this.yieldPos < this.awaitPos))
+			this.raise(this.yieldPos, "Yield expression cannot be a default value");
+		if (this.awaitPos > 0)
+			this.raise(this.awaitPos, "Await expression cannot be a default value");
+	}
+
+	/// end parseutil.js
+
+	/// begin node.js
+
+	protected <T extends INode> T finishNode(T node) {
+		return finishNodeAt(node, this.lastTokEndLoc);
+	}
+
+	protected <T extends INode> T finishNodeAt(T node, Position pos) {
+		SourceLocation loc = node.getLoc();
+		loc.setSource(inputSubstring(loc.getStart().getOffset(), pos.getOffset()));
+		loc.setEnd(pos);
+		return node;
+	}
+
+	/// begin expression.js
+
+	protected static class PropInfo {
+		boolean init, get, set;
+		boolean is(Property.Kind kind) {
+			switch (kind) {
+			case INIT: return init;
+			case GET: return get;
+			case SET: return set;
+			default: throw new CatastrophicError("Unexpected kind " + kind + ".");
+			}
+		}
+
+		void set(Property.Kind kind) {
+			switch (kind) {
+			case INIT: init = true; break;
+			case GET: get = true; break;
+			case SET: set = true; break;
+			default: throw new CatastrophicError("Unexpected kind " + kind + ".");
+			}
+		}
+	}
+
+	// Check if property name clashes with already added.
+	// Object/class getters and setters are not allowed to clash ---
+	// either with each other or with an init property --- and in
+	// strict mode, init properties are also not allowed to be repeated.
+	private void checkPropClash(Property prop, Map<String, PropInfo> propHash) {
+		if (this.options.ecmaVersion() >= 6 && (prop.isComputed() || prop.isMethod() || prop.isShorthand()))
+			return;
+
+		Expression key = prop.getKey();
+
+		String name;
+		if (key instanceof Identifier)
+			name = ((Identifier) key).getName();
+		else if (key instanceof Literal)
+			name = ((Literal) key).getStringValue();
+		else
+			return;
+
+		Property.Kind kind = prop.getKind();
+		if (this.options.ecmaVersion() >= 6) {
+			if ("__proto__".equals(name) && kind == Property.Kind.INIT) {
+				if (propHash.containsKey(name))
+					this.raiseRecoverable(key, "Redefinition of __proto__ property");
+				PropInfo pi = new PropInfo();
+				pi.set(Property.Kind.INIT);
+				propHash.put(name, pi);
+			}
+			return;
+		}
+
+		PropInfo other = propHash.get(name);
+		if (other != null) {
+			boolean isGetSet = kind.isAccessor;
+			if ((this.strict || isGetSet) && other.is(kind) || !(isGetSet ^ other.init))
+				this.raiseRecoverable(key, "Redefinition of property");
+		} else {
+			propHash.put(name, other = new PropInfo());
+		}
+		other.set(kind);
+	}
+
+	// ### Expression parsing
+
+	// These nest, from the most general expression type at the top to
+	// 'atomic', nondivisible expression types at the bottom. Most of
+	// the functions will simply let the function(s) below them parse,
+	// and, *if* the syntactic construct they handle is present, wrap
+	// the AST node that the inner parser gave them in another node.
+
+	// Parse a full expression. The optional arguments are used to
+	// forbid the `in` operator (in for loops initalization expressions)
+	// and provide reference for storing '=' operator inside shorthand
+	// property assignment in contexts where both object expression
+	// and object pattern might appear (so it's possible to raise
+	// delayed syntax error at correct position).
+	protected Expression parseExpression(boolean noIn, DestructuringErrors refDestructuringErrors) {
+		Position startLoc = this.startLoc;
+		Expression expr = this.parseMaybeAssign(noIn, refDestructuringErrors, null);
+		if (this.type == TokenType.comma) {
+			List<Expression> expressions = CollectionUtil.makeList(expr);
+			SequenceExpression node = new SequenceExpression(new SourceLocation(startLoc), expressions);
+			while (this.eat(TokenType.comma))
+				expressions.add(this.parseMaybeAssign(noIn, refDestructuringErrors, null));
+			return this.finishNode(node);
+		}
+		return expr;
+	}
+
+	public interface AfterLeftParse {
+		Expression call(Expression left, int startPos, Position startLoc);
+	}
+
+	// Parse an assignment expression. This includes applications of
+	// operators like `+=`.
+	protected Expression parseMaybeAssign(boolean noIn, DestructuringErrors refDestructuringErrors, AfterLeftParse afterLeftParse) {
+		if (this.inGenerator && this.isContextual("yield"))
+			return this.parseYield();
+
+		boolean ownDestructuringErrors = false;
+		if (refDestructuringErrors == null) {
+			refDestructuringErrors = new DestructuringErrors();
+			ownDestructuringErrors = true;
+		}
+		int startPos = this.start;
+		Position startLoc = this.startLoc;
+		if (this.type == TokenType.parenL || this.type == TokenType.name)
+			this.potentialArrowAt = this.start;
+		Expression left = this.parseMaybeConditional(noIn, refDestructuringErrors);
+		if (afterLeftParse != null)
+			left = afterLeftParse.call(left, startPos, startLoc);
+		if (this.type.isAssign) {
+			this.checkPatternErrors(refDestructuringErrors, true);
+			if (!ownDestructuringErrors)
+				refDestructuringErrors.reset();
+			Expression l = this.type == TokenType.eq ? (Expression) this.toAssignable(left, false) : left;
+			refDestructuringErrors.shorthandAssign = 0; // reset because shorthand default was used correctly
+			String operator = String.valueOf(this.value);
+			this.checkLVal(l, false, null);
+			this.next();
+			Expression r = this.parseMaybeAssign(noIn, null, null);
+			AssignmentExpression node = new AssignmentExpression(new SourceLocation(startLoc), operator, l, r);
+			return this.finishNode(node);
+		} else {
+			if (ownDestructuringErrors)
+				this.checkExpressionErrors(refDestructuringErrors, true);
+		}
+		return left;
+	}
+
+	// Parse a ternary conditional (`?:`) operator.
+	protected Expression parseMaybeConditional(boolean noIn, DestructuringErrors refDestructuringErrors) {
+		Position startLoc = this.startLoc;
+		Expression expr = this.parseExprOps(noIn, refDestructuringErrors);
+		if (this.checkExpressionErrors(refDestructuringErrors, false))
+			return expr;
+		if (this.eat(TokenType.question)) {
+			return parseConditionalRest(noIn, startLoc, expr);
+		}
+		return expr;
+	}
+
+	protected Expression parseConditionalRest(boolean noIn, Position start, Expression test) {
+		Expression consequent = this.parseMaybeAssign(false, null, null);
+		this.expect(TokenType.colon);
+		Expression alternate = this.parseMaybeAssign(noIn, null, null);
+		ConditionalExpression node = new ConditionalExpression(new SourceLocation(start), test, consequent, alternate);
+		return this.finishNode(node);
+	}
+
+	// Start the precedence parser.
+	protected Expression parseExprOps(boolean noIn, DestructuringErrors refDestructuringErrors) {
+		int startPos = this.start;
+		Position startLoc = this.startLoc;
+		Expression expr = this.parseMaybeUnary(refDestructuringErrors, false);
+		if (this.checkExpressionErrors(refDestructuringErrors, false))
+			return expr;
+		return this.parseExprOp(expr, startPos, startLoc, -1, noIn);
+	}
+
+	// Parse binary operators with the operator precedence parsing
+	// algorithm. `left` is the left-hand side of the operator.
+	// `minPrec` provides context that allows the function to stop and
+	// defer further parser to one of its callers when it encounters an
+	// operator that has a lower precedence than the set it is parsing.
+	protected Expression parseExprOp(Expression left, int leftStartPos, Position leftStartLoc, int minPrec, boolean noIn) {
+		int prec = this.type.binop;
+		if (prec != 0 && (!noIn || this.type != TokenType._in)) {
+			if (prec > minPrec) {
+				boolean logical = this.type == TokenType.logicalOR || this.type == TokenType.logicalAND;
+				String op = String.valueOf(this.value);
+				this.next();
+				int startPos = this.start;
+				Position startLoc = this.startLoc;
+				Expression right = this.parseExprOp(this.parseMaybeUnary(null, false), startPos, startLoc, prec, noIn);
+				Expression node = this.buildBinary(leftStartPos, leftStartLoc, left, right, op, logical);
+				return this.parseExprOp(node, leftStartPos, leftStartLoc, minPrec, noIn);
+			}
+		}
+		return left;
+	}
+
+	private Expression buildBinary(int startPos, Position startLoc, Expression left, Expression right, String op, boolean logical) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		Expression node = logical ? new LogicalExpression(loc, op, left, right) : new BinaryExpression(loc, op, left, right);
+		return this.finishNode(node);
+	}
+
+	// Parse unary operators, both prefix and postfix.
+	protected Expression parseMaybeUnary(DestructuringErrors refDestructuringErrors, boolean sawUnary) {
+		int startPos = this.start;
+		Position startLoc = this.startLoc;
+		Expression expr;
+		if (this.inAsync && this.isContextual("await")) {
+			expr = this.parseAwait();
+			sawUnary = true;
+		} else if (this.type.isPrefix) {
+			String operator = String.valueOf(this.value);
+			boolean update = this.type == TokenType.incDec;
+			this.next();
+			Expression argument = this.parseMaybeUnary(null, true);
+			SourceLocation loc = new SourceLocation(startLoc);
+			Expression node = update ? new UpdateExpression(loc, operator, argument, true)
+			: new UnaryExpression(loc, operator, argument, true);
+			this.checkExpressionErrors(refDestructuringErrors, true);
+			if (update)
+				this.checkLVal(argument, false, null);
+			else if (this.strict && operator.equals("delete") &&
+					argument instanceof Identifier)
+				this.raiseRecoverable(node, "Deleting local variable in strict mode");
+			else
+				sawUnary = true;
+			expr = this.finishNode(node);
+		} else {
+			expr = this.parseExprSubscripts(refDestructuringErrors);
+			if (this.checkExpressionErrors(refDestructuringErrors, false))
+				return expr;
+			while (this.type.isPostfix && !this.canInsertSemicolon()) {
+				UpdateExpression node = new UpdateExpression(new SourceLocation(startLoc), String.valueOf(this.value), expr, false);
+				this.checkLVal(expr, false, null);
+				this.next();
+				expr = this.finishNode(node);
+			}
+		}
+
+		if (!sawUnary && this.eat(TokenType.starstar))
+			return this.buildBinary(startPos, startLoc, expr, this.parseMaybeUnary(null, false), "**", false);
+		else
+			return expr;
+	}
+
+	// Parse call, dot, and `[]`-subscript expressions.
+	protected Expression parseExprSubscripts(DestructuringErrors refDestructuringErrors) {
+		int startPos = this.start;
+		Position startLoc = this.startLoc;
+		Expression expr = this.parseExprAtom(refDestructuringErrors);
+		boolean skipArrowSubscripts = expr instanceof ArrowFunctionExpression &&
+				!inputSubstring(this.lastTokStart, this.lastTokEnd).equals(")");
+		if (this.checkExpressionErrors(refDestructuringErrors, false) || skipArrowSubscripts)
+			return expr;
+		return this.parseSubscripts(expr, startPos, startLoc, false);
+	}
+
+	protected Expression parseSubscripts(Expression base, int startPos, Position startLoc, boolean noCalls) {
+		for (;;) {
+			Pair<Expression, Boolean> p = parseSubscript(base, startLoc, noCalls);
+			if (p.snd())
+				base = p.fst();
+			else
+				return p.fst();
+		}
+	}
+
+	/**
+	 * Parse a single subscript {@code s}; if more subscripts could follow, return {@code Pair.make(s, true},
+	 * otherwise return {@code Pair.make(s, false)}.
+	 */
+	protected Pair<Expression, Boolean> parseSubscript(final Expression base, Position startLoc, boolean noCalls) {
+		boolean maybeAsyncArrow = this.options.ecmaVersion() >= 8 && base instanceof Identifier && "async".equals(((Identifier) base).getName()) && !this.canInsertSemicolon();
+		if (this.eat(TokenType.dot)) {
+			MemberExpression node = new MemberExpression(new SourceLocation(startLoc), base, this.parseIdent(true), false);
+			return Pair.make(this.finishNode(node), true);
+		} else if (this.eat(TokenType.bracketL)) {
+			MemberExpression node = new MemberExpression(new SourceLocation(startLoc), base, this.parseExpression(false, null), true);
+			this.expect(TokenType.bracketR);
+			return Pair.make(this.finishNode(node), true);
+		} else if (!noCalls && this.eat(TokenType.parenL)) {
+			DestructuringErrors refDestructuringErrors = new DestructuringErrors();
+			int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+			this.yieldPos = 0;
+			this.awaitPos = 0;
+			List<Expression> exprList = this.parseExprList(TokenType.parenR, this.options.ecmaVersion() >= 8, false, refDestructuringErrors);
+			if (maybeAsyncArrow && shouldParseAsyncArrow()) {
+				this.checkPatternErrors(refDestructuringErrors, true);
+				this.checkYieldAwaitInDefaultParams();
+				this.yieldPos = oldYieldPos;
+				this.awaitPos = oldAwaitPos;
+				return Pair.make(this.parseArrowExpression(startLoc, exprList, true), false);
+			}
+			this.checkExpressionErrors(refDestructuringErrors, true);
+			if (oldYieldPos > 0) this.yieldPos = oldYieldPos;
+			if (oldAwaitPos > 0) this.awaitPos = oldAwaitPos;
+			CallExpression node = new CallExpression(new SourceLocation(startLoc), base, new ArrayList<>(), exprList);
+			return Pair.make(this.finishNode(node), true);
+		} else if (this.type == TokenType.backQuote) {
+			TaggedTemplateExpression node = new TaggedTemplateExpression(new SourceLocation(startLoc), base, this.parseTemplate(true));
+			return Pair.make(this.finishNode(node), true);
+		} else {
+			return Pair.make(base, false);
+		}
+	}
+
+	protected boolean shouldParseAsyncArrow() {
+		return !this.canInsertSemicolon() && this.eat(TokenType.arrow);
+	}
+
+	// Parse an atomic expression --- either a single token that is an
+	// expression, an expression started by a keyword like `function` or
+	// `new`, or an expression wrapped in punctuation like `()`, `[]`,
+	// or `{}`.
+	protected Expression parseExprAtom(DestructuringErrors refDestructuringErrors) {
+		Expression node;
+		boolean canBeArrow = this.potentialArrowAt == this.start;
+		if (this.type == TokenType._super) {
+			if (!this.inFunction)
+				this.raise(this.start, "'super' outside of function or class");
+			node = new Super(new SourceLocation(this.startLoc));
+			this.next();
+			return this.finishNode(node);
+		} else if (this.type == TokenType._this) {
+			node = new ThisExpression(new SourceLocation(this.startLoc));
+			this.next();
+			return this.finishNode(node);
+		} else if (this.type == TokenType.name) {
+			Position startLoc = this.startLoc;
+			Identifier id = this.parseIdent(this.type != TokenType.name);
+			if (this.options.ecmaVersion() >= 8 && "async".equals(id.getName()) && !this.canInsertSemicolon() && this.eat(TokenType._function))
+				return (Expression) this.parseFunction(startLoc, false, false, true);
+			if (canBeArrow && !this.canInsertSemicolon()) {
+				if (this.eat(TokenType.arrow))
+					return this.parseArrowExpression(startLoc, CollectionUtil.makeList(id), false);
+				if (this.options.ecmaVersion() >= 8 && id.getName().equals("async") && this.type == TokenType.name) {
+					id = this.parseIdent(false);
+					if (this.canInsertSemicolon() || !this.eat(TokenType.arrow))
+						this.unexpected();
+					return this.parseArrowExpression(startLoc, CollectionUtil.makeList(id), true);
+				}
+			}
+			return id;
+		} else if (this.type == TokenType.regexp || this.type == TokenType.num || this.type == TokenType.string || this.type == TokenType.bigint) {
+			return this.parseLiteral(this.type, this.value);
+		} else if (this.type == TokenType._null || this.type == TokenType._true || this.type == TokenType._false) {
+			Object val = this.type == TokenType._null ? null : this.type == TokenType._true;
+			node = new Literal(new SourceLocation(this.type.keyword, startLoc), this.type, val);
+			this.next();
+			return this.finishNode(node);
+		} else if (this.type == TokenType.parenL) {
+			return this.parseParenAndDistinguishExpression(canBeArrow);
+		} else if (this.type == TokenType.bracketL) {
+			Position startLoc = this.startLoc;
+			this.next();
+			List<Expression> elements = this.parseExprList(TokenType.bracketR, true, true, refDestructuringErrors);
+			node = new ArrayExpression(new SourceLocation(startLoc), elements);
+			return this.finishNode(node);
+		} else if (this.type == TokenType.braceL) {
+			return this.parseObj(false, refDestructuringErrors);
+		} else if (this.type == TokenType._function) {
+			Position startLoc = this.startLoc;
+			this.next();
+			return (Expression) this.parseFunction(startLoc, false, false, false);
+		} else if (this.type == TokenType._class) {
+			return (Expression) this.parseClass(this.startLoc, false);
+		} else if (this.type == TokenType._new) {
+			return this.parseNew();
+		} else if (this.type == TokenType.backQuote) {
+			return this.parseTemplate(false);
+		} else {
+			this.unexpected();
+			return null;
+		}
+	}
+
+	protected Literal parseLiteral(TokenType tokenType, Object value) {
+		SourceLocation loc = new SourceLocation(inputSubstring(this.start, this.end), this.startLoc);
+		Literal node = new Literal(loc, tokenType, value);
+		this.next();
+		return this.finishNode(node);
+	}
+
+	protected Expression parseParenExpression() {
+		this.expect(TokenType.parenL);
+		Expression val = this.parseExpression(false, null);
+		this.expect(TokenType.parenR);
+		return val;
+	}
+
+	protected Expression parseParenAndDistinguishExpression(boolean canBeArrow) {
+		Position startLoc = this.startLoc;
+		Expression val;
+		if (this.options.ecmaVersion() >= 6) {
+			this.next();
+
+			DestructuringErrors refDestructuringErrors = new DestructuringErrors();
+			int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+			ParenthesisedExpressions parenExprs = parseParenthesisedExpressions(refDestructuringErrors);
+
+			if (canBeArrow && !this.canInsertSemicolon() && this.eat(TokenType.arrow)) {
+				this.checkPatternErrors(refDestructuringErrors, true);
+				this.checkYieldAwaitInDefaultParams();
+				if (parenExprs.innerParenStart != 0)
+					this.unexpected(parenExprs.innerParenStart);
+				this.yieldPos = oldYieldPos;
+				this.awaitPos = oldAwaitPos;
+				return this.parseParenArrowList(startLoc, parenExprs.exprList);
+			}
+
+			if (parenExprs.exprList.isEmpty() || parenExprs.lastIsComma)
+				this.unexpected(this.lastTokStart);
+			if (parenExprs.spreadStart != 0)
+				this.unexpected(parenExprs.spreadStart);
+			this.checkExpressionErrors(refDestructuringErrors, true);
+			if (oldYieldPos > 0) this.yieldPos = oldYieldPos;
+			if (oldAwaitPos > 0) this.awaitPos = oldAwaitPos;
+
+			if (parenExprs.exprList.size() > 1) {
+				val = new SequenceExpression(new SourceLocation(parenExprs.startLoc), parenExprs.exprList);
+				this.finishNodeAt(val, parenExprs.endLoc);
+			} else {
+				val = parenExprs.exprList.get(0);
+			}
+		} else {
+			val = this.parseParenExpression();
+		}
+
+		if (this.options.preserveParens()) {
+			ParenthesizedExpression par = new ParenthesizedExpression(new SourceLocation(startLoc), val);
+			return this.finishNode(par);
+		} else {
+			return val;
+		}
+	}
+
+	/**
+	 * Information about a list of expressions between parentheses.
+	 */
+	static protected class ParenthesisedExpressions {
+		/** If non-zero, indicates the location of a spread expression in the list. */
+		int spreadStart = 0;
+
+		/** If non-zero, indicates the location of a parenthesised expression in the list. */
+		int innerParenStart = 0;
+
+		/**
+		 * The start position (i.e., right after the opening parenthesis) and
+		 * end location (i.e., before the closing parenthesis) of the list.
+		 */
+		Position startLoc, endLoc;
+
+		/**
+		 * The list itself.
+		 */
+		List<Expression> exprList = new ArrayList<Expression>();
+
+		boolean lastIsComma;
+	}
+
+	protected ParenthesisedExpressions parseParenthesisedExpressions(DestructuringErrors refDestructuringErrors) {
+		boolean allowTrailingComma = this.options.ecmaVersion() >= 8;
+		ParenthesisedExpressions parenExprs = new ParenthesisedExpressions();
+		parenExprs.startLoc = this.startLoc;
+		boolean first = true;
+		this.yieldPos = 0;
+		this.awaitPos = 0;
+		while (this.type != TokenType.parenR) {
+			if (first)
+				first = false;
+			else
+				this.expect(TokenType.comma);
+			if (allowTrailingComma && this.afterTrailingComma(TokenType.parenR, true)) {
+				parenExprs.lastIsComma = true;
+				break;
+			} else if (this.type == TokenType.ellipsis) {
+				parenExprs.spreadStart = this.start;
+				parenExprs.exprList.add(this.parseParenItem(this.parseRest(false), -1, null));
+				if (this.type == TokenType.comma)
+					this.raise(this.startLoc, "Comma is not permitted after the rest element");
+				break;
+			} else {
+				if (this.type == TokenType.parenL && parenExprs.innerParenStart == 0) {
+					parenExprs.innerParenStart = this.start;
+				}
+				parenExprs.exprList.add(this.parseMaybeAssign(false, refDestructuringErrors, this::parseParenItem));
+			}
+		}
+		parenExprs.endLoc = this.startLoc;
+		this.expect(TokenType.parenR);
+		return parenExprs;
+	}
+
+	protected Expression parseParenItem(Expression left, int startPos, Position startLoc) {
+		return left;
+	}
+
+	protected Expression parseParenArrowList(Position startLoc, List<Expression> exprList) {
+		return this.parseArrowExpression(startLoc, exprList, false);
+	}
+
+	// New's precedence is slightly tricky. It must allow its argument to
+	// be a `[]` or dot subscript expression, but not a call --- at least,
+	// not without wrapping it in parentheses. Thus, it uses the noCalls
+	// argument to parseSubscripts to prevent it from consuming the
+	// argument list.
+	protected Expression parseNew() {
+		Position startLoc = this.startLoc;
+		Identifier meta = this.parseIdent(true);
+		if (this.options.ecmaVersion() >= 6 && this.eat(TokenType.dot)) {
+			Identifier property = this.parseIdent(true);
+			if (!property.getName().equals("target"))
+				this.raiseRecoverable(property, "The only valid meta property for new is new.target");
+			if (!this.inFunction)
+				this.raiseRecoverable(meta, "new.target can only be used in functions");
+			MetaProperty node = new MetaProperty(new SourceLocation(startLoc), meta, property);
+			return this.finishNode(node);
+		}
+		int innerStartPos = this.start;
+		Position innerStartLoc = this.startLoc;
+		Expression callee = this.parseSubscripts(this.parseExprAtom(null), innerStartPos, innerStartLoc, true);
+		List<Expression> arguments;
+		if (this.eat(TokenType.parenL))
+			arguments = this.parseExprList(TokenType.parenR, this.options.ecmaVersion() >= 8, false, null);
+		else
+			arguments = new ArrayList<Expression>();
+		NewExpression node = new NewExpression(new SourceLocation(startLoc), callee, new ArrayList<>(), arguments);
+		return this.finishNode(node);
+	}
+
+	// Parse template expression.
+	protected TemplateElement parseTemplateElement(boolean isTagged) {
+		Position startLoc = this.startLoc;
+		String raw, cooked;
+		if (this.type == TokenType.invalidTemplate) {
+			if (!isTagged) {
+				this.raiseRecoverable(this.start, "Bad escape sequence in untagged template literal");
+			}
+			raw = String.valueOf(this.value);
+			cooked = null;
+		} else {
+			raw = inputSubstring(this.start, this.end).replaceAll("\r\n?", "\n");
+			cooked = String.valueOf(this.value);
+		}
+		this.next();
+		boolean tail = this.type == TokenType.backQuote;
+		TemplateElement elem = new TemplateElement(new SourceLocation(startLoc), cooked, raw, tail);
+		return this.finishNode(elem);
+	}
+
+	protected TemplateLiteral parseTemplate(boolean isTagged) {
+		Position startLoc = this.startLoc;
+		this.next();
+		List<Expression> expressions = new ArrayList<Expression>();
+		TemplateElement curElt = this.parseTemplateElement(isTagged);
+		List<TemplateElement> quasis = CollectionUtil.makeList(curElt);
+		while (!curElt.isTail()) {
+			this.expect(TokenType.dollarBraceL);
+			expressions.add(this.parseExpression(false, null));
+			this.expect(TokenType.braceR);
+			quasis.add(curElt = this.parseTemplateElement(isTagged));
+		}
+		this.next();
+		TemplateLiteral node = new TemplateLiteral(new SourceLocation(startLoc), expressions, quasis);
+		return this.finishNode(node);
+	}
+
+	/*
+	 * Auxiliary class used to collect information about properties during parsing.
+	 *
+	 * This is needed because parsing properties and methods requires a fair bit of lookahead.
+	 */
+	protected static class PropertyInfo {
+		Expression key, value;
+		String kind = "init";
+		boolean computed = false, method = false, isPattern, isGenerator, isAsync;
+		Position startLoc;
+
+		public PropertyInfo(boolean isPattern, boolean isGenerator, Position startLoc) {
+			this.isPattern = isPattern;
+			this.isGenerator = isGenerator;
+			this.startLoc = startLoc;
+		}
+
+		MethodDefinition.Kind getMethodKind() {
+			return MethodDefinition.Kind.valueOf(StringUtil.uc(kind));
+		}
+	}
+
+	// Parse an object literal or binding pattern.
+	protected Expression parseObj(boolean isPattern, DestructuringErrors refDestructuringErrors) {
+		Position startLoc = this.startLoc;
+		boolean first = true;
+		Map<String, PropInfo> propHash = new LinkedHashMap<>();
+		List<Property> properties = new ArrayList<Property>();
+		this.next();
+		while (!this.eat(TokenType.braceR)) {
+			if (!first) {
+				this.expect(TokenType.comma);
+				if (this.afterTrailingComma(TokenType.braceR, false))
+					break;
+			} else {
+				first = false;
+			}
+
+			properties.add(this.finishNode(parseProperty(isPattern, refDestructuringErrors, propHash)));
+		}
+		SourceLocation loc = new SourceLocation(startLoc);
+		Expression node = isPattern ? new ObjectPattern(loc, properties) : new ObjectExpression(loc, properties);
+		return this.finishNode(node);
+	}
+
+	protected Property parseProperty(boolean isPattern, DestructuringErrors refDestructuringErrors,
+			Map<String, PropInfo> propHash) {
+		Position propStartLoc = this.startLoc;
+		boolean isGenerator = false;
+		if (this.options.ecmaVersion() >= 6) {
+			if (!isPattern)
+				isGenerator = this.eat(TokenType.star);
+		}
+		PropertyInfo pi = new PropertyInfo(isPattern, isGenerator, propStartLoc);
+		this.parsePropertyName(pi);
+		if (!isPattern && this.options.ecmaVersion() >= 8 && !isGenerator && this.isAsyncProp(pi)) {
+			pi.isAsync = true;
+			this.parsePropertyName(pi);
+		} else {
+			pi.isAsync = false;
+		}
+		this.parsePropertyValue(pi, refDestructuringErrors);
+		Property prop = new Property(new SourceLocation(pi.startLoc), pi.key, pi.value, pi.kind, pi.computed, pi.method);
+		this.checkPropClash(prop, propHash);
+		return prop;
+	}
+
+	private boolean isAsyncProp(PropertyInfo pi) {
+		return !pi.computed && pi.key instanceof Identifier && ((Identifier) pi.key).getName().equals("async") &&
+				(this.type == TokenType.name || this.type == TokenType.num || this.type == TokenType.string ||
+				 this.type == TokenType.bracketL || this.type.keyword != null) &&
+				!this.canInsertSemicolon();
+	}
+
+	protected void parsePropertyValue(PropertyInfo pi, DestructuringErrors refDestructuringErrors) {
+		if ((pi.isGenerator || pi.isAsync) && this.type == TokenType.colon)
+			this.unexpected();
+
+		if (this.eat(TokenType.colon)) {
+			pi.value = pi.isPattern ? this.parseMaybeDefault(this.startLoc, null) : this.parseMaybeAssign(false, refDestructuringErrors, null);
+			pi.kind = "init";
+		} else if (this.options.ecmaVersion() >= 6 && this.type == TokenType.parenL) {
+			if (pi.isPattern)
+				this.unexpected();
+			pi.kind = "init";
+			pi.method = true;
+			pi.value = this.parseMethod(pi.isGenerator, pi.isAsync);
+		} else if (this.options.ecmaVersion() >= 5 && !pi.computed && pi.key instanceof Identifier &&
+				(((Identifier)pi.key).getName().equals("get") || ((Identifier)pi.key).getName().equals("set")) &&
+				(this.type != TokenType.comma && this.type != TokenType.braceR)) {
+			if (pi.isGenerator || pi.isAsync || pi.isPattern)
+				this.unexpected();
+			pi.kind = ((Identifier) pi.key).getName();
+			PropertyInfo pi2 = new PropertyInfo(false, false, this.startLoc);
+			this.parsePropertyName(pi2);
+			pi.key = pi2.key;
+			pi.computed = pi2.computed;
+			pi.value = this.parseMethod(false, false);
+			int paramCount = pi.kind.equals("get") ? 0 : 1;
+			FunctionExpression fn = (FunctionExpression) pi.value;
+			List<Expression> params = fn.getRawParameters();
+			if (params.size() != paramCount) {
+				if (pi.kind.equals("get"))
+					this.raiseRecoverable(pi.value, "getter should have no params");
+				else
+					this.raiseRecoverable(pi.value, "setter should have exactly one param");
+			}
+			if (pi.kind.equals("set") && fn.hasRest())
+				this.raiseRecoverable(params.get(params.size()-1), "Setter cannot use rest params");
+		} else if (this.options.ecmaVersion() >= 6 && !pi.computed && pi.key instanceof Identifier) {
+			String name = ((Identifier) pi.key).getName();
+			if (this.keywords.contains(name) ||
+					(this.strict ? this.reservedWordsStrict : this.reservedWords).contains(name) ||
+					(this.inGenerator && name.equals("yield")) ||
+					(this.inAsync && name.equals("await")))
+				this.raiseRecoverable(pi.key, "'" + name + "' can not be used as shorthand property");
+			pi.kind = "init";
+			if (pi.isPattern) {
+				pi.value = this.parseMaybeDefault(pi.startLoc, pi.key);
+			} else if (this.type == TokenType.eq && refDestructuringErrors != null) {
+				if (refDestructuringErrors.shorthandAssign == 0)
+					refDestructuringErrors.shorthandAssign = this.start;
+				pi.value = this.parseMaybeDefault(pi.startLoc, pi.key);
+			} else {
+				pi.value = pi.key;
+			}
+		} else {
+			this.unexpected();
+		}
+	}
+
+	protected void parsePropertyName(PropertyInfo result) {
+		if (this.options.ecmaVersion() >= 6) {
+			if (this.eat(TokenType.bracketL)) {
+				result.key = this.parseMaybeAssign(false, null, null);
+				result.computed = true;
+				this.expect(TokenType.bracketR);
+				return;
+			}
+		}
+		if (this.type == TokenType.num || this.type == TokenType.string)
+			result.key = this.parseExprAtom(null);
+		else
+			result.key = this.parseIdent(true);
+	}
+
+	// Parse object or class method.
+	protected FunctionExpression parseMethod(boolean isGenerator, boolean isAsync) {
+		Position startLoc = this.startLoc;
+		boolean oldInGen = this.inGenerator, oldInAsync = this.inAsync;
+		int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+
+		this.inGenerator = isGenerator;
+		this.inAsync = isAsync;
+		this.yieldPos = 0;
+		this.awaitPos = 0;
+
+		this.expect(TokenType.parenL);
+		List<Expression> params = this.parseBindingList(TokenType.parenR, false, this.options.ecmaVersion() >= 8, false);
+		this.checkYieldAwaitInDefaultParams();
+		boolean generator = this.options.ecmaVersion() >= 6 && isGenerator;
+		Node body = this.parseFunctionBody(null, params, false);
+
+		this.inGenerator = oldInGen;
+		this.inAsync = oldInAsync;
+		this.yieldPos = oldYieldPos;
+		this.awaitPos = oldAwaitPos;
+		Identifier id = null;
+		FunctionExpression node = new FunctionExpression(new SourceLocation(startLoc), id, params, body, generator, isAsync);
+		return this.finishNode(node);
+	}
+
+	// Parse arrow function expression with given parameters.
+	protected ArrowFunctionExpression parseArrowExpression(Position startLoc, List<Expression> rawParams, boolean isAsync) {
+		boolean oldInGen = this.inGenerator, oldInAsync = this.inAsync;
+		int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+
+		this.inGenerator = false;
+		this.inAsync = isAsync;
+		this.yieldPos = 0;
+		this.awaitPos = 0;
+
+		List<Expression> params = this.toAssignableList(rawParams, true);
+		Node body = this.parseFunctionBody(null, params, true);
+
+		this.inGenerator = oldInGen;
+		this.inAsync = oldInAsync;
+		this.yieldPos = oldYieldPos;
+		this.awaitPos = oldAwaitPos;
+		ArrowFunctionExpression node = new ArrowFunctionExpression(new SourceLocation(startLoc), params, body, false, isAsync);
+		return this.finishNode(node);
+	}
+
+	// Parse function body and check parameters.
+	protected Node parseFunctionBody(Identifier id, List<Expression> params, boolean isArrowFunction) {
+		boolean isExpression = isArrowFunction && this.type != TokenType.braceL;
+		Node body;
+		if (isExpression) {
+			body = this.parseMaybeAssign(false, null, null);
+		} else {
+			// Start a new scope with regard to labels and the `inFunction`
+			// flag (restore them to their old value afterwards).
+			boolean oldInFunc = this.inFunction;
+			Stack<LabelInfo> oldLabels = this.labels;
+			this.inFunction = true; this.labels = new Stack<LabelInfo>();
+			body = this.parseBlock(true);
+			this.inFunction = oldInFunc;
+			this.labels = oldLabels;
+		}
+
+		// If this is a strict mode function, verify that argument names
+		// are not repeated, and it does not try to bind the words `eval`
+		// or `arguments`.
+		Statement useStrict = null;
+		if (!isExpression && body instanceof BlockStatement) {
+			List<Statement> bodyStmts = ((BlockStatement) body).getBody();
+			if (!bodyStmts.isEmpty() && isUseStrict(bodyStmts.get(0)))
+				useStrict = bodyStmts.get(0);
+		}
+		if (useStrict != null && options.ecmaVersion() >= 7 && !isSimpleParamList(params))
+			raiseRecoverable(useStrict, "Illegal 'use strict' directive in function with non-simple parameter list");
+
+		if (this.strict || useStrict != null) {
+			boolean oldStrict = this.strict;
+			this.strict = true;
+			if (id != null)
+				this.checkLVal(id, true, null);
+			this.checkParams(params);
+			this.strict = oldStrict;
+		} else if (isArrowFunction || !isSimpleParamList(params)) {
+			this.checkParams(params);
+		}
+
+		return body;
+	}
+
+	private boolean isSimpleParamList(List<Expression> params) {
+		for (Expression param : params)
+			if (!(param instanceof Identifier))
+				return false;
+		return true;
+	}
+
+	// Checks function params for various disallowed patterns such as using "eval"
+	// or "arguments" and duplicate parameters.
+	protected void checkParams(List<? extends INode> params) {
+		Set<String> nameHash = new LinkedHashSet<>();
+		for (INode param : params)
+			this.checkLVal(param, true, nameHash);
+	}
+
+	// Parses a comma-separated list of expressions, and returns them as
+	// an array. `close` is the token type that ends the list, and
+	// `allowEmpty` can be turned on to allow subsequent commas with
+	// nothing in between them to be parsed as `null` (which is needed
+	// for array literals).
+	protected List<Expression> parseExprList(TokenType close, boolean allowTrailingComma, boolean allowEmpty, DestructuringErrors refDestructuringErrors) {
+		List<Expression> elts = new ArrayList<Expression>();
+		boolean first = true;
+		while (!this.eat(close)) {
+			if (!first) {
+				this.expect(TokenType.comma);
+				if (allowTrailingComma && this.afterTrailingComma(close, false))
+					break;
+			} else {
+				first = false;
+			}
+
+			Expression elt;
+			if (allowEmpty && this.type == TokenType.comma) {
+				elt = null;
+			} else if (this.type == TokenType.ellipsis) {
+				elt = this.processExprListItem(this.parseSpread(refDestructuringErrors));
+				if (this.type == TokenType.comma && refDestructuringErrors != null && refDestructuringErrors.trailingComma == 0) {
+					refDestructuringErrors.trailingComma = this.start;
+				}
+			} else
+				elt = this.processExprListItem(this.parseMaybeAssign(false, refDestructuringErrors, null));
+			elts.add(elt);
+		}
+		return elts;
+	}
+
+	protected Expression processExprListItem(Expression e) {
+		return e;
+	}
+
+	// Parse the next token as an identifier. If `liberal` is true (used
+	// when parsing properties), it will also convert keywords into
+	// identifiers.
+	protected Identifier parseIdent(boolean liberal) {
+		Position startLoc = this.startLoc;
+		if (liberal && this.options.allowReserved() == AllowReserved.NEVER)
+			liberal = false;
+		String name = null;
+		if (this.type == TokenType.name) {
+			if (!liberal && (this.strict ? this.reservedWordsStrict : this.reservedWords).contains(this.value) &&
+					(this.options.ecmaVersion() >= 6 ||
+					inputSubstring(this.start, this.end).indexOf("\\") == -1))
+				this.raiseRecoverable(this.start, "The keyword '" + this.value + "' is reserved");
+			if (this.inGenerator && this.value.equals("yield"))
+				this.raiseRecoverable(this.start, "Can not use 'yield' as identifier inside a generator");
+			if (this.inAsync && this.value.equals("await"))
+				this.raiseRecoverable(this.start, "Can not use 'await' as identifier inside an async function");
+			name = String.valueOf(this.value);
+		} else if (liberal && this.type.keyword != null) {
+			name = this.type.keyword;
+		} else {
+			this.unexpected();
+		}
+		this.next();
+		Identifier node = new Identifier(new SourceLocation(startLoc), name);
+		return this.finishNode(node);
+	}
+
+	// Parses yield expression inside generator.
+	protected YieldExpression parseYield() {
+		if (this.awaitPos == 0)
+			this.awaitPos = this.start;
+
+		Position startLoc = this.startLoc;
+		this.next();
+		boolean delegate;
+		Expression argument;
+		if (this.type == TokenType.semi || this.canInsertSemicolon() || (this.type != TokenType.star && !this.type.startsExpr)) {
+			delegate = false;
+			argument = null;
+		} else {
+			delegate = this.eat(TokenType.star);
+			argument = this.parseMaybeAssign(false, null, null);
+		}
+		YieldExpression node = new YieldExpression(new SourceLocation(startLoc), argument, delegate);
+		return this.finishNode(node);
+	}
+
+	protected AwaitExpression parseAwait() {
+		Position startLoc = this.startLoc;
+		this.next();
+		Expression argument = this.parseMaybeUnary(null, true);
+		AwaitExpression node = new AwaitExpression(new SourceLocation(startLoc), argument);
+		return this.finishNode(node);
+	}
+
+	/// end expression.js
+
+	/// begin lval.js
+
+	// Convert existing expression atom to assignable pattern
+	// if possible.
+	protected INode toAssignable(INode node, boolean isBinding) {
+		if (this.options.ecmaVersion() >= 6 && node != null) {
+			if (node instanceof Identifier) {
+				if (this.inAsync && ((Identifier) node).getName().equals("await"))
+					this.raise(node, "Can not use 'await' as identifier inside an async function");
+				return node;
+			}
+
+			if (node instanceof ObjectPattern || node instanceof ArrayPattern) {
+				return node;
+			}
+
+			if (node instanceof ObjectExpression) {
+				List<Property> properties = new ArrayList<Property>();
+				for (Property prop : ((ObjectExpression) node).getProperties()) {
+					if (prop.getKind().isAccessor)
+						this.raise(prop.getKey(), "Object pattern can't contain getter or setter");
+					Expression val = (Expression) this.toAssignable(prop.getRawValue(), isBinding);
+					properties.add(new Property(prop.getLoc(), prop.getKey(), val, prop.getKind().name(), prop.isComputed(), prop.isMethod()));
+				}
+				return new ObjectPattern(node.getLoc(), properties);
+			}
+
+			if (node instanceof ArrayExpression)
+				return new ArrayPattern(node.getLoc(), this.toAssignableList(((ArrayExpression) node).getElements(), isBinding));
+
+			if (node instanceof AssignmentExpression) {
+				AssignmentExpression assgn = (AssignmentExpression) node;
+				if (assgn.getOperator().equals("=")) {
+					this.toAssignable(assgn.getLeft(), isBinding);
+					return new AssignmentPattern(node.getLoc(), "=", assgn.getLeft(), assgn.getRight());
+				} else {
+					this.raise(assgn.getLeft().getLoc().getEnd(), "Only '=' operator can be used for specifying default value.");
+				}
+			}
+
+			if (node instanceof AssignmentPattern) {
+				return node;
+			}
+
+			if (node instanceof ParenthesizedExpression) {
+				Expression expr = ((ParenthesizedExpression) node).getExpression();
+				return new ParenthesizedExpression(node.getLoc(), (Expression) this.toAssignable(expr, isBinding));
+			}
+
+			if (node instanceof MemberExpression)
+				if (!isBinding)
+					return node;
+
+			this.raise(node, "Assigning to rvalue");
+		}
+		return node;
+	}
+
+	// Convert list of expression atoms to binding list.
+	protected List<Expression> toAssignableList(List<Expression> exprList, boolean isBinding) {
+		int end = exprList.size();
+		if (end > 0) {
+			Expression last = exprList.get(end-1);
+			if (last != null && last instanceof RestElement) {
+				--end;
+			} else if (last != null && last instanceof SpreadElement) {
+				Expression arg = ((SpreadElement) last).getArgument();
+				arg = (Expression) this.toAssignable(arg, isBinding);
+				if (!(arg instanceof Identifier || arg instanceof MemberExpression || arg instanceof ArrayPattern))
+					this.unexpected(arg.getLoc().getStart());
+				exprList.set(end-1, last = new RestElement(last.getLoc(), arg));
+				--end;
+			}
+
+			if (isBinding && last instanceof RestElement && !(((RestElement) last).getArgument() instanceof Identifier))
+				this.unexpected(((RestElement) last).getArgument().getLoc().getStart());
+		}
+		for (int i=0; i<end; ++i)
+			exprList.set(i, (Expression) this.toAssignable(exprList.get(i), isBinding));
+		return exprList;
+	}
+
+	// Parses spread element.
+	protected SpreadElement parseSpread(DestructuringErrors refDestructuringErrors) {
+		Position start = this.startLoc;
+		this.next();
+		SpreadElement node = new SpreadElement(new SourceLocation(start), this.parseMaybeAssign(false, refDestructuringErrors, null));
+		return this.finishNode(node);
+	}
+
+	protected RestElement parseRest(boolean allowNonIdent) {
+		Position start = this.startLoc;
+		this.next();
+
+		// RestElement inside of a function parameter must be an identifier
+		Expression argument = null;
+		if (allowNonIdent)
+			if (this.type == TokenType.name)
+				argument = this.parseIdent(false);
+			else
+				this.unexpected();
+		else
+			if (this.type == TokenType.name || this.type == TokenType.bracketL)
+				argument = this.parseBindingAtom();
+			else
+				this.unexpected();
+		RestElement node = new RestElement(new SourceLocation(start), argument);
+		return this.finishNode(node);
+	}
+
+	// Parses lvalue (assignable) atom.
+	protected Expression parseBindingAtom() {
+		if (this.options.ecmaVersion() < 6)
+			return this.parseIdent(false);
+
+		if (this.type == TokenType.name)
+			return this.parseIdent(false);
+
+		if (this.type == TokenType.bracketL) {
+			Position start = this.startLoc;
+			this.next();
+			List<Expression> elements = this.parseBindingList(TokenType.bracketR, true, true, false);
+			ArrayPattern node = new ArrayPattern(new SourceLocation(start), elements);
+			return this.finishNode(node);
+		}
+
+		if (this.type == TokenType.braceL)
+			return this.parseObj(true, null);
+
+		this.unexpected();
+		return null;
+	}
+
+	protected List<Expression> parseBindingList(TokenType close, boolean allowEmpty, boolean allowTrailingComma, boolean allowNonIdent) {
+		List<Expression> result = new ArrayList<Expression>();
+		boolean first = true;
+		while (!this.eat(close)) {
+			if (first)
+				first = false;
+			else
+				this.expect(TokenType.comma);
+			if (allowEmpty && this.type == TokenType.comma) {
+				result.add(null);
+			} else if (allowTrailingComma && this.afterTrailingComma(close, false)) {
+				break;
+			} else if (this.type == TokenType.ellipsis) {
+				result.add(this.processBindingListItem(this.parseRest(allowNonIdent)));
+				if (this.type == TokenType.comma)
+					this.raise(this.start, "Comma is not permitted after the rest element");
+				this.expect(close);
+				break;
+			} else {
+				result.add(this.processBindingListItem(this.parseMaybeDefault(this.startLoc, null)));
+			}
+		}
+		return result;
+	}
+
+	protected Expression processBindingListItem(Expression e) {
+		return e;
+	}
+
+	// Parses assignment pattern around given atom if possible.
+	protected Expression parseMaybeDefault(Position startLoc, Expression left) {
+		if (left == null)
+			left = this.parseBindingAtom();
+		if (this.options.ecmaVersion() < 6 || !this.eat(TokenType.eq))
+			return left;
+		AssignmentPattern node = new AssignmentPattern(new SourceLocation(startLoc), "=", left, this.parseMaybeAssign(false, null, null));
+		return this.finishNode(node);
+	}
+
+	// Verify that a node is an lval --- something that can be assigned
+	// to.
+	protected void checkLVal(INode expr, boolean isBinding, Set<String> checkClashes) {
+		if (expr instanceof Identifier) {
+			String name = ((Identifier) expr).getName();
+			if (this.strict && this.reservedWordsStrictBind.contains(name))
+				this.raiseRecoverable(expr, (isBinding ? "Binding " : "Assigning to ") + name + " in strict mode");
+			if (checkClashes != null) {
+				if (!checkClashes.add(name))
+					this.raiseRecoverable(expr, "Argument name clash");
+			}
+		} else if (expr instanceof MemberExpression) {
+			if (isBinding)
+				this.raiseRecoverable(expr, (isBinding ? "Binding" : "Assigning to") + " member expression");
+		} else if (expr instanceof ObjectPattern) {
+			for (Property prop : ((ObjectPattern) expr).getProperties())
+				this.checkLVal(prop.getRawValue(), isBinding, checkClashes);
+		} else if (expr instanceof ArrayPattern) {
+			for (Expression elem : ((ArrayPattern) expr).getRawElements())
+				if (elem != null)
+					this.checkLVal(elem, isBinding, checkClashes);
+		} else if (expr instanceof AssignmentPattern) {
+			this.checkLVal(((AssignmentPattern) expr).getLeft(), isBinding, checkClashes);
+		} else if (expr instanceof RestElement) {
+			this.checkLVal(((RestElement) expr).getArgument(), isBinding, checkClashes);
+		} else if (expr instanceof ParenthesizedExpression) {
+			this.checkLVal(((ParenthesizedExpression) expr).getExpression(), isBinding, checkClashes);
+		} else {
+			this.raise(expr.getLoc().getStart(), (isBinding ? "Binding" : "Assigning to") + " rvalue");
+		}
+	}
+
+	/// end lval.js
+
+
+	/// begin tokencontext.js
+
+	public static class TokContext {
+		public static final TokContext
+		b_stat = new TokContext("{", false),
+		b_expr = new TokContext("{", true),
+		b_tmpl = new TokContext("${", true),
+		p_stat = new TokContext("(", false),
+		p_expr = new TokContext("(", true),
+		q_tmpl = new TokContext("`", true, true, p -> p.tryReadTemplateToken()),
+		f_expr = new TokContext("function", true);
+
+		public final String token;
+		public final boolean isExpr, preserveSpace;
+		public final Function<Parser, Token> override;
+
+		public TokContext(String token, boolean isExpr, boolean preserveSpace, Function<Parser, Token> override) {
+			this.token = token;
+			this.isExpr = isExpr;
+			this.preserveSpace = preserveSpace;
+			this.override = override;
+		}
+
+		public TokContext(String token, boolean isExpr) {
+			this(token, isExpr, false, null);
+		}
+	}
+
+	private Stack<TokContext> initialContext() {
+		Stack<TokContext> s = new Stack<TokContext>();
+		s.push(TokContext.b_stat);
+		return s;
+	}
+
+	protected boolean braceIsBlock(TokenType prevType) {
+		if (prevType == TokenType.colon) {
+			TokContext parent = this.curContext();
+			if (parent == TokContext.b_stat || parent == TokContext.b_expr)
+				return !parent.isExpr;
+		}
+		if (prevType == TokenType._return)
+			return inputSubstring(this.lastTokEnd, this.start).matches("(?s).*(?:" + lineBreak + ").*");
+		if (prevType == TokenType._else || prevType == TokenType.semi || prevType == TokenType.eof || prevType == TokenType.parenR)
+			return true;
+		if (prevType == TokenType.braceL)
+			return this.curContext() == TokContext.b_stat;
+		return !this.exprAllowed;
+	}
+
+	protected void updateContext(TokenType prevType) {
+		TokenType type = this.type;
+		if (type.keyword != null && prevType == TokenType.dot)
+			this.exprAllowed = false;
+		else
+			type.updateContext(this, prevType);
+	}
+
+	/// end tokencontext.js
+
+
+	/// begin statement.js
+	// ### Statement parsing
+
+	// Parse a program. Initializes the parser, reads any number of
+	// statements, and wraps them in a Program node.  Optionally takes a
+	// `program` argument.  If present, the statements will be appended
+	// to its body instead of creating a new node.
+	protected Program parseTopLevel(Position startLoc, Program node) {
+		boolean first = true;
+		Set<String> exports = new LinkedHashSet<String>();
+		List<Statement> body = new ArrayList<Statement>();
+		while (this.type != TokenType.eof) {
+			Statement stmt = this.parseStatement(true, true, exports);
+			if (stmt != null)
+				body.add(stmt);
+			if (first) {
+				if (this.isUseStrict(stmt))
+					this.setStrict(true);
+				first = false;
+			}
+		}
+		this.next();
+		if (node == null) {
+			String sourceType = this.options.ecmaVersion() >= 6 ? this.options.sourceType() : null;
+			node = new Program(new SourceLocation(startLoc), body, sourceType);
+		} else {
+			node.getBody().addAll(body);
+		}
+		return this.finishNode(node);
+	}
+
+	private final LabelInfo loopLabel = new LabelInfo(null, "loop", -1);
+	private final LabelInfo switchLabel = new LabelInfo(null, "switch", -1);
+
+	protected boolean isLet() {
+		if (this.type != TokenType.name || this.options.ecmaVersion() < 6 || !this.value.equals("let"))
+			return false;
+		Matcher m = Whitespace.skipWhiteSpace.matcher(this.input);
+		m.find(this.pos);
+		int next = m.end(), nextCh = charAt(next);
+		if (mayFollowLet(nextCh))
+			return true; // '{' and '['
+		if (Identifiers.isIdentifierStart(nextCh, true)) {
+			int endPos;
+			for (endPos = next + 1; Identifiers.isIdentifierChar(charAt(endPos), true); ++endPos);
+			String ident = inputSubstring(next, endPos);
+			if (!this.keywords.contains(ident))
+				return true;
+		}
+		return false;
+	}
+
+	protected boolean mayFollowLet(int c) {
+		return c == 91 || c == 123;
+	}
+
+	protected final Statement parseStatement(boolean declaration, boolean topLevel) {
+		return parseStatement(declaration, topLevel, null);
+	}
+
+	// check 'async [no LineTerminator here] function'
+	// - 'async /*foo*/ function' is OK.
+	// - 'async /*\n*/ function' is invalid.
+	boolean isAsyncFunction() {
+		if (this.type != TokenType.name || this.options.ecmaVersion() < 8 || !this.value.equals("async"))
+			return false;
+
+		Matcher m = Whitespace.skipWhiteSpace.matcher(this.input);
+		m.find(this.pos);
+		int next = m.end();
+		return !Whitespace.lineBreakG.matcher(inputSubstring(this.pos, next)).matches() &&
+				inputSubstring(next, next+8).equals("function") &&
+				(next + 8 == this.input.length() || !Identifiers.isIdentifierChar(this.input.codePointAt(next + 8), false));
+	}
+
+	/**
+	 * Parse a single statement.
+	 *
+	 * <p>
+	 * If expecting a statement and finding a slash operator, parse a
+	 * regular expression literal. This is to handle cases like
+	 * <code>if (foo) /blah/.exec(foo)</code>, where looking at the previous token
+	 * does not help.
+	 *
+	 * <p>
+	 * If {@code declaration} is true, this method may return {@code null},
+	 * indicating the parsed statement was a declaration that has no semantic meaning
+	 * (such as a Flow interface declaration). This is never the case in standard
+	 * ECMAScript.
+	 */
+	protected Statement parseStatement(boolean declaration, boolean topLevel, Set<String> exports) {
+		TokenType starttype = this.type;
+		String kind = null;
+		Position startLoc = this.startLoc;
+
+		if (this.isLet()) {
+			starttype = TokenType._var;
+			kind = "let";
+		}
+
+		// Most types of statements are recognized by the keyword they
+		// start with. Many are trivial to parse, some require a bit of
+		// complexity.
+
+		if (starttype == TokenType._break || starttype == TokenType._continue) {
+			return this.parseBreakContinueStatement(startLoc, starttype.keyword);
+		} else if (starttype == TokenType._debugger) {
+			return this.parseDebuggerStatement(startLoc);
+		} else if (starttype == TokenType._do) {
+			return this.parseDoStatement(startLoc);
+		} else if (starttype == TokenType._for) {
+			this.next();
+			return this.parseForStatement(startLoc);
+		} else if (starttype == TokenType._function) {
+			if (!declaration && this.options.ecmaVersion() >= 6)
+				this.unexpected();
+			return this.parseFunctionStatement(startLoc, false);
+		} else if (starttype == TokenType._class) {
+			if (!declaration)
+				this.unexpected();
+			return (Statement) this.parseClass(startLoc, true);
+		} else if (starttype == TokenType._if) {
+			return this.parseIfStatement(startLoc);
+		} else if (starttype == TokenType._return) {
+			return this.parseReturnStatement(startLoc);
+		} else if (starttype == TokenType._switch) {
+			return this.parseSwitchStatement(startLoc);
+		} else if (starttype == TokenType._throw) {
+			return this.parseThrowStatement(startLoc);
+		} else if (starttype == TokenType._try) {
+			return this.parseTryStatement(startLoc);
+		} else if (starttype == TokenType._const || starttype == TokenType._var) {
+			if (kind == null)
+				kind = String.valueOf(this.value);
+			if (!declaration && !kind.equals("var"))
+				this.unexpected();
+			return this.parseVarStatement(startLoc, kind);
+		} else if (starttype == TokenType._while) {
+			return this.parseWhileStatement(startLoc);
+		} else if (starttype == TokenType._with) {
+			return this.parseWithStatement(startLoc);
+		} else if (starttype == TokenType.braceL) {
+			return this.parseBlock(false);
+		} else if (starttype == TokenType.semi) {
+			return this.parseEmptyStatement(startLoc);
+		} else if (starttype == TokenType._export || starttype == TokenType._import) {
+			if (!this.options.allowImportExportEverywhere()) {
+				if (!topLevel)
+					this.raise(this.start, "'import' and 'export' may only appear at the top level");
+				if (!this.inModule)
+					this.raise(this.start, "'import' and 'export' may appear only with 'sourceType: module'");
+			}
+			return starttype == TokenType._import ? this.parseImport(startLoc) : this.parseExport(startLoc, exports);
+
+		} else {
+			if (this.isAsyncFunction() && declaration) {
+				this.next();
+				return this.parseFunctionStatement(startLoc, true);
+			}
+
+			// If the statement does not start with a statement keyword or a
+			// brace, it's an ExpressionStatement or LabeledStatement. We
+			// simply start parsing an expression, and afterwards, if the
+			// next token is a colon and the expression was a simple
+			// Identifier node, we switch to interpreting it as a label.
+			String maybeName = String.valueOf(this.value);
+			Expression expr = this.parseExpression(false, null);
+			if (starttype == TokenType.name && expr instanceof Identifier && this.eat(TokenType.colon))
+				return this.parseLabeledStatement(startLoc, maybeName, (Identifier) expr);
+			else return this.parseExpressionStatement(declaration, startLoc, expr);
+		}
+	}
+
+	protected Statement parseBreakContinueStatement(Position startLoc, String keyword) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		boolean isBreak = keyword.equals("break");
+		this.next();
+		Identifier label = null;
+		if (this.eat(TokenType.semi) || this.insertSemicolon()) {
+			label = null;
+		} else if (this.type != TokenType.name) {
+			this.unexpected();
+		} else {
+			label = this.parseIdent(false);
+			this.semicolon();
+		}
+
+		// Verify that there is an actual destination to break or
+		// continue to.
+		int i=0;
+		for (; i<labels.size(); ++i) {
+			LabelInfo lab = labels.get(i);
+			if (label == null || label.getName().equals(lab.name)) {
+				if (lab.kind != null && (isBreak || lab.kind.equals("loop")))
+					break;
+				if (label != null && isBreak)
+					break;
+			}
+		}
+		if (i == this.labels.size())
+			this.raise(startLoc, "Unsyntactic " + keyword);
+		Statement node = isBreak ? new BreakStatement(loc, label) : new ContinueStatement(loc, label);
+		return this.finishNode(node);
+	}
+
+	protected DebuggerStatement parseDebuggerStatement(Position startLoc) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		this.next();
+		this.semicolon();
+		return this.finishNode(new DebuggerStatement(loc));
+	}
+
+	protected DoWhileStatement parseDoStatement(Position startLoc) {
+		this.next();
+		this.labels.push(loopLabel);
+		Statement body = this.parseStatement(false, false);
+		this.labels.pop();
+		this.expect(TokenType._while);
+		Expression test = this.parseParenExpression();
+		if (this.options.ecmaVersion() >= 6)
+			this.eat(TokenType.semi);
+		else
+			this.semicolon();
+		return this.finishNode(new DoWhileStatement(new SourceLocation(startLoc), test, body));
+	}
+
+	// Disambiguating between a `for` and a `for`/`in` or `for`/`of`
+	// loop is non-trivial. Basically, we have to parse the init `var`
+	// statement or expression, disallowing the `in` operator (see
+	// the second parameter to `parseExpression`), and then check
+	// whether the next token is `in` or `of`. When there is no init
+	// part (semicolon immediately after the opening parenthesis), it
+	// is a regular `for` loop.
+	// This method assumes that the initial `for` token has already been consumed.
+	protected Statement parseForStatement(Position startLoc) {
+		this.labels.push(loopLabel);
+		this.expect(TokenType.parenL);
+		if (this.type == TokenType.semi)
+			return this.parseFor(startLoc, null);
+		boolean isLet = this.isLet();
+		if (this.type == TokenType._var || this.type == TokenType._const || isLet) {
+			Position initStartLoc = this.startLoc;
+			String kind = isLet ? "let" : String.valueOf(this.value);
+			this.next();
+			VariableDeclaration init = this.finishNode(this.parseVar(initStartLoc, true, kind));
+			if ((this.type == TokenType._in || (this.options.ecmaVersion() >= 6 && this.isContextual("of"))) && init.getDeclarations().size() == 1 &&
+					!(!kind.equals("var") && init.getDeclarations().get(0).hasInit()))
+				return this.parseForIn(startLoc, init);
+			return this.parseFor(startLoc, init);
+		}
+		DestructuringErrors refDestructuringErrors = new DestructuringErrors();
+		Expression init = this.parseExpression(true, refDestructuringErrors);
+		if (this.type == TokenType._in || (this.options.ecmaVersion() >= 6 && this.isContextual("of"))) {
+			this.checkPatternErrors(refDestructuringErrors, true);
+			init = (Expression) this.toAssignable(init, false);
+			this.checkLVal(init, false, null);
+			return this.parseForIn(startLoc, init);
+		} else {
+			this.checkExpressionErrors(refDestructuringErrors, true);
+		}
+		return this.parseFor(startLoc, init);
+	}
+
+	protected Statement parseFunctionStatement(Position startLoc, boolean isAsync) {
+		this.next();
+		INode fn = this.parseFunction(startLoc, true, false, isAsync);
+		// if we encountered an anonymous function, wrap it in an expression
+		// statement (we will have logged a syntax error already)
+		if (fn instanceof Expression)
+			return this.finishNode(new ExpressionStatement(new SourceLocation(startLoc), (Expression) fn));
+		return (Statement) fn;
+	}
+
+	private boolean isFunction() {
+		return this.type == TokenType._function || this.isAsyncFunction();
+	}
+
+	protected Statement parseIfStatement(Position startLoc) {
+		this.next();
+		Expression test = this.parseParenExpression();
+		// allow function declarations in branches, but only in non-strict mode
+		Statement consequent = this.parseStatement(!this.strict && this.isFunction(), false);
+		Statement alternate = this.eat(TokenType._else) ? this.parseStatement(!this.strict && this.isFunction(), false) : null;
+		return this.finishNode(new IfStatement(new SourceLocation(startLoc), test, consequent, alternate));
+	}
+
+	protected ReturnStatement parseReturnStatement(Position startLoc) {
+		if (!this.inFunction && !this.options.allowReturnOutsideFunction())
+			this.raise(this.start, "'return' outside of function");
+		this.next();
+
+		// In `return` (and `break`/`continue`), the keywords with
+		// optional arguments, we eagerly look for a semicolon or the
+		// possibility to insert one.
+		Expression argument;
+		if (this.eat(TokenType.semi) || this.insertSemicolon()) {
+			argument = null;
+		} else {
+			argument = this.parseExpression(false, null);
+			this.semicolon();
+		}
+		return this.finishNode(new ReturnStatement(new SourceLocation(startLoc), argument));
+	}
+
+	protected SwitchStatement parseSwitchStatement(Position startLoc) {
+		this.next();
+		Expression discriminant = this.parseParenExpression();
+		List<SwitchCase> cases = new ArrayList<SwitchCase>();
+		this.expect(TokenType.braceL);
+		this.labels.push(switchLabel);
+
+		// Statements under must be grouped (by label) in SwitchCase
+		// nodes. `cur` is used to keep the node that we are currently
+		// adding statements to.
+
+		boolean sawDefault = false;
+		Position curCaseStart = null;
+		Expression curTest = null;
+		List<Statement> curConsequent = null;
+		while (this.type != TokenType.braceR) {
+			if (this.type == TokenType._case || this.type == TokenType._default) {
+				boolean isCase = this.type == TokenType._case;
+				if (curConsequent != null)
+					cases.add(this.finishNode(new SwitchCase(new SourceLocation(curCaseStart), curTest, curConsequent)));
+				curCaseStart = this.startLoc;
+				curTest = null;
+				curConsequent = new ArrayList<Statement>();
+				this.next();
+				if (isCase) {
+					curTest = this.parseExpression(false, null);
+				} else {
+					if (sawDefault)
+						this.raiseRecoverable(this.lastTokStart, "Multiple default clauses");
+					sawDefault = true;
+					curTest = null;
+				}
+				this.expect(TokenType.colon);
+			} else {
+				if (curConsequent == null)
+					this.unexpected();
+				Statement stmt = this.parseStatement(true, false);
+				if (stmt != null)
+					curConsequent.add(stmt);
+			}
+		}
+		if (curConsequent != null)
+			cases.add(this.finishNode(new SwitchCase(new SourceLocation(curCaseStart), curTest, curConsequent)));
+		this.next(); // Closing brace
+		this.labels.pop();
+		return this.finishNode(new SwitchStatement(new SourceLocation(startLoc), discriminant, cases));
+	}
+
+	protected ThrowStatement parseThrowStatement(Position startLoc) {
+		this.next();
+		if (inputSubstring(this.lastTokEnd, this.start).matches("(?s).*(?:" + lineBreak + ").*"))
+			this.raise(this.lastTokEnd, "Illegal newline after throw");
+		Expression argument = this.parseExpression(false, null);
+		this.semicolon();
+		return this.finishNode(new ThrowStatement(new SourceLocation(startLoc), argument));
+	}
+
+	protected TryStatement parseTryStatement(Position startLoc) {
+		this.next();
+		BlockStatement block = this.parseBlock(false);
+		CatchClause handler = this.type == TokenType._catch ? this.parseCatchClause(this.startLoc) : null;
+		BlockStatement finalizer = this.eat(TokenType._finally) ? this.parseBlock(false) : null;
+		if (handler == null && finalizer == null)
+			this.raise(startLoc, "Missing catch or finally clause");
+		return this.finishNode(new TryStatement(new SourceLocation(startLoc), block, handler, null, finalizer));
+	}
+
+	protected CatchClause parseCatchClause(Position startLoc) {
+		this.next();
+		this.expect(TokenType.parenL);
+		Expression param = this.parseBindingAtom();
+		this.checkLVal(param, true, null);
+		this.expect(TokenType.parenR);
+		BlockStatement catchBody = this.parseBlock(false);
+		return this.finishNode(new CatchClause(new SourceLocation(startLoc), (IPattern)param, null, catchBody));
+	}
+
+	protected Statement parseVarStatement(Position startLoc, String kind) {
+		this.next();
+		VariableDeclaration node = this.parseVar(startLoc, false, kind);
+		this.semicolon();
+		return this.finishNode(node);
+	}
+
+	protected WhileStatement parseWhileStatement(Position startLoc) {
+		this.next();
+		Expression test = this.parseParenExpression();
+		this.labels.push(loopLabel);
+		Statement body = this.parseStatement(false, false);
+		this.labels.pop();
+		return this.finishNode(new WhileStatement(new SourceLocation(startLoc), test, body));
+	}
+
+	protected WithStatement parseWithStatement(Position startLoc) {
+		if (this.strict)
+			this.raise(startLoc, "'with' in strict mode");
+		this.next();
+		Expression object = this.parseParenExpression();
+		Statement body = this.parseStatement(false, false);
+		return this.finishNode(new WithStatement(new SourceLocation(startLoc), object, body));
+	}
+
+	protected EmptyStatement parseEmptyStatement(Position startLoc) {
+		this.next();
+		return this.finishNode(new EmptyStatement(new SourceLocation(startLoc)));
+	}
+
+	protected LabeledStatement parseLabeledStatement(Position startLoc, String maybeName, Identifier expr) {
+		for (int i = 0; i < this.labels.size(); ++i)
+			if (maybeName.equals(this.labels.get(i).name))
+				this.raise(expr, "Label '" + maybeName + "' is already declared");
+		String kind = this.type.isLoop ? "loop" : this.type == TokenType._switch ? "switch" : null;
+		for (int i = this.labels.size() - 1; i >= 0; i--) {
+			LabelInfo label = this.labels.get(i);
+			if (label.statementStart == startLoc.getOffset()) {
+				label.statementStart = this.start;
+				label.kind = kind;
+			} else {
+				break;
+			}
+		}
+		this.labels.push(new LabelInfo(maybeName, kind, this.start));
+		Statement body = this.parseStatement(true, false);
+		this.labels.pop();
+		if (body == null)
+			return null;
+		Identifier label = expr;
+		return this.finishNode(new LabeledStatement(new SourceLocation(startLoc), label, body));
+	}
+
+	protected ExpressionStatement parseExpressionStatement(boolean declaration, Position startLoc, Expression expr) {
+		this.semicolon();
+		return this.finishNode(new ExpressionStatement(new SourceLocation(startLoc), expr));
+	}
+
+	// Parse a semicolon-enclosed block of statements, handling `"use
+	// strict"` declarations when `allowStrict` is true (used for
+	// function bodies).
+	protected BlockStatement parseBlock(boolean allowStrict) {
+		Position startLoc = this.startLoc;
+		boolean first = true;
+		Boolean oldStrict = null;
+		List<Statement> body = new ArrayList<Statement>();
+		this.expect(TokenType.braceL);
+		while (!this.eat(TokenType.braceR)) {
+			Statement stmt = this.parseStatement(true, false);
+			if (stmt != null)
+					body.add(stmt);
+			if (first && allowStrict && this.isUseStrict(stmt)) {
+				oldStrict = this.strict;
+				this.setStrict(this.strict = true);
+			}
+			first = false;
+		}
+		if (oldStrict == Boolean.FALSE)
+			this.setStrict(false);
+		return this.finishNode(new BlockStatement(new SourceLocation(startLoc), body));
+	}
+
+	// Parse a regular `for` loop. The disambiguation code in
+	// `parseStatement` will already have parsed the init statement or
+	// expression.
+	protected ForStatement parseFor(Position startLoc, Node init) {
+		this.expect(TokenType.semi);
+		Expression test = this.type == TokenType.semi ? null : this.parseExpression(false, null);
+		this.expect(TokenType.semi);
+		Expression update = this.type == TokenType.parenR ? null : this.parseExpression(false, null);
+		this.expect(TokenType.parenR);
+		Statement body = this.parseStatement(false, false);
+		this.labels.pop();
+		return this.finishNode(new ForStatement(new SourceLocation(startLoc), init, test, update, body));
+	}
+
+	// Parse a `for`/`in` and `for`/`of` loop, which are almost
+	// same from parser's perspective.
+	protected Statement parseForIn(Position startLoc, Node left) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		boolean isForIn = this.type == TokenType._in;
+		this.next();
+		Expression right = this.parseExpression(false, null);
+		this.expect(TokenType.parenR);
+		Statement body = this.parseStatement(false, false);
+		this.labels.pop();
+		EnhancedForStatement node;
+		if (isForIn)
+			node = new ForInStatement(loc, left, right, body, false);
+		else
+			node = new ForOfStatement(loc, left, right, body);
+		return this.finishNode(node);
+	}
+
+	// Parse a list of variable declarations.
+	protected VariableDeclaration parseVar(Position startLoc, boolean isFor, String kind) {
+		List<VariableDeclarator> declarations = new ArrayList<VariableDeclarator>();
+		for (;;) {
+			Position varDeclStart = this.startLoc;
+			Expression id = this.parseVarId();
+			Expression init = null;
+			if (this.eat(TokenType.eq)) {
+				init = this.parseMaybeAssign(isFor, null, null);
+			} else if (kind.equals("const") && !(this.type == TokenType._in || (this.options.ecmaVersion() >= 6 && this.isContextual("of")))) {
+				this.unexpected();
+			} else if (!(id instanceof Identifier) && !(isFor && (this.type == TokenType._in || this.isContextual("of")))) {
+				this.raise(this.lastTokEnd, "Complex binding patterns require an initialization value");
+			}
+			declarations.add(this.finishNode(
+					new VariableDeclarator(new SourceLocation(varDeclStart), (IPattern) id, init, noTypeAnnotation, DeclarationFlags.none)));
+			if (!this.eat(TokenType.comma))
+				break;
+		}
+		return new VariableDeclaration(new SourceLocation(startLoc), kind, declarations, noDeclareKeyword);
+	}
+
+	protected Expression parseVarId() {
+		Expression res = this.parseBindingAtom();
+		this.checkLVal(res, true, null);
+		return res;
+	}
+
+	/**
+	 * If {@code isStatement} is true and the function has a name, the result is a
+	 * {@linkplain FunctionDeclaration}, otherwise it is a {@linkplain FunctionExpression}.
+	 */
+	protected INode parseFunction(Position startLoc, boolean isStatement, boolean allowExpressionBody, boolean isAsync) {
+		boolean oldInGen = this.inGenerator, oldInAsync = this.inAsync;
+		int oldYieldPos = this.yieldPos, oldAwaitPos = this.awaitPos;
+		Pair<Boolean, Identifier> p = parseFunctionName(isStatement, isAsync);
+		return parseFunctionRest(startLoc, isStatement, allowExpressionBody,
+				oldInGen, oldInAsync, oldYieldPos, oldAwaitPos, p.fst(), p.snd());
+	}
+
+	protected Pair<Boolean, Identifier> parseFunctionName(boolean isStatement, boolean isAsync) {
+		boolean generator = parseGeneratorMarker(isAsync);
+		Identifier id = null;
+		if (isStatement)
+			if (this.type == TokenType.name)
+				id = this.parseIdent(false);
+			else
+				this.raise(this.start, "Missing function name", true);
+
+		this.inGenerator = generator;
+		this.inAsync = isAsync;
+		this.yieldPos = 0;
+		this.awaitPos = 0;
+
+		if (!isStatement && this.type == TokenType.name)
+			id = this.parseIdent(false);
+		return Pair.make(generator, id);
+	}
+
+	protected boolean parseGeneratorMarker(boolean isAsync) {
+		boolean generator = false;
+		if (this.options.ecmaVersion() >= 6 && !isAsync)
+			generator = this.eat(TokenType.star);
+		return generator;
+	}
+
+	protected IFunction parseFunctionRest(Position startLoc, boolean isStatement,
+			boolean allowExpressionBody, boolean oldInGen, boolean oldInAsync,
+			int oldYieldPos, int oldAwaitPos,
+			boolean generator, Identifier id) {
+		boolean async = this.inAsync;
+		List<Expression> params = this.parseFunctionParams();
+		Node body = this.parseFunctionBody(id, params, allowExpressionBody);
+		this.inGenerator = oldInGen;
+		this.inAsync = oldInAsync;
+		this.yieldPos = oldYieldPos;
+		this.awaitPos = oldAwaitPos;
+		IFunction node;
+		SourceLocation loc = new SourceLocation(startLoc);
+		if (isStatement && id != null)
+			node = new FunctionDeclaration(loc, id, params, (BlockStatement) body, generator, async);
+		else
+			node = new FunctionExpression(loc, id, params, body, generator, async);
+		return this.finishNode(node);
+	}
+
+	protected List<Expression> parseFunctionParams() {
+		this.expect(TokenType.parenL);
+		List<Expression> params = this.parseBindingList(TokenType.parenR, false, this.options.ecmaVersion() >= 8, true);
+		this.checkYieldAwaitInDefaultParams();
+		return params;
+	}
+
+	// Parse a class declaration or literal (depending on the
+	// `isStatement` parameter).
+	protected Node parseClass(Position startLoc, boolean isStatement) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		this.next();
+		Identifier id = this.parseClassId(isStatement);
+		Expression superClass = this.parseClassSuper();
+		Position bodyStartLoc = this.startLoc;
+		boolean hadConstructor = false;
+		List<MemberDefinition<?>> body = new ArrayList<MemberDefinition<?>>();
+		this.expect(TokenType.braceL);
+		while (!this.eat(TokenType.braceR)) {
+			if (this.eat(TokenType.semi))
+				continue;
+			MemberDefinition<?> member = parseClassMember(hadConstructor);
+			body.add(member);
+			hadConstructor = hadConstructor || member.isConstructor();
+		}
+		ClassBody classBody = this.finishNode(new ClassBody(new SourceLocation(bodyStartLoc), body));
+		Node node;
+		if (isStatement)
+			node = new ClassDeclaration(loc, id, superClass, classBody);
+		else
+			node = new ClassExpression(loc, id, superClass, classBody);
+		return this.finishNode(node);
+	}
+
+	/**
+	 * Parse a member declaration in a class.
+	 */
+	protected MemberDefinition<?> parseClassMember(boolean hadConstructor) {
+		Position methodStartLoc = this.startLoc;
+		boolean isGenerator = this.eat(TokenType.star);
+		boolean isMaybeStatic = this.type == TokenType.name && this.value.equals("static");
+		PropertyInfo pi = new PropertyInfo(false, isGenerator, methodStartLoc);
+		this.parsePropertyName(pi);
+		boolean isStatic = isMaybeStatic && this.type != TokenType.parenL;
+		if (isStatic) {
+			if (isGenerator)
+				this.unexpected();
+			isGenerator = this.eat(TokenType.star);
+			pi = new PropertyInfo(false, isGenerator, methodStartLoc);
+			this.parsePropertyName(pi);
+		}
+		if (this.options.ecmaVersion() >= 8 && !isGenerator && this.isAsyncProp(pi)) {
+			pi.isAsync = true;
+			this.parsePropertyName(pi);
+		}
+		return parseClassPropertyBody(pi, hadConstructor, isStatic);
+	}
+
+	/**
+	 * Parse a method declaration in a class, assuming that its name has already been consumed.
+	 */
+	protected MemberDefinition<?> parseClassPropertyBody(PropertyInfo pi, boolean hadConstructor, boolean isStatic) {
+		pi.kind = "method";
+		boolean isGetSet = false;
+		if (!pi.computed) {
+			if (!pi.isGenerator && !pi.isAsync && pi.key instanceof Identifier && this.type != TokenType.parenL && (((Identifier) pi.key).getName().equals("get") || ((Identifier) pi.key).getName().equals("set"))) {
+				isGetSet = true;
+				pi.kind = ((Identifier) pi.key).getName();
+				this.parsePropertyName(pi);
+			}
+			if (!isStatic && (pi.key instanceof Identifier && ((Identifier) pi.key).getName().equals("constructor") ||
+					pi.key instanceof Literal && ((Literal) pi.key).getStringValue().equals("constructor"))) {
+				if (hadConstructor)
+					this.raise(pi.key, "Duplicate constructor in the same class");
+				if (isGetSet)
+					this.raise(pi.key, "Constructor can't have get/set modifier");
+				if (pi.isGenerator)
+					this.raise(pi.key, "Constructor can't be a generator");
+				if (pi.isAsync)
+					this.raise(pi.key, "Constructor can't be an async method");
+				pi.kind = "constructor";
+			}
+		}
+		MethodDefinition node = this.parseClassMethod(pi.startLoc, pi.isGenerator, pi.isAsync, isStatic, pi.computed, pi.getMethodKind(),
+				pi.key);
+		if (isGetSet) {
+			int paramCount = pi.kind.equals("get") ? 0 : 1;
+			List<Expression> params = node.getValue().getRawParameters();
+			if (params.size() != paramCount) {
+				if (pi.kind.equals("get"))
+					this.raiseRecoverable(node.getValue(), "getter should have no params");
+				else
+					this.raiseRecoverable(node.getValue(), "setter should have exactly one param");
+			}
+			if (pi.kind.equals("set") && node.getValue().hasRest())
+				this.raiseRecoverable(params.get(params.size()-1), "Setter cannot use rest params");
+		}
+		return node;
+	}
+
+	protected MethodDefinition parseClassMethod(Position startLoc, boolean isGenerator, boolean isAsync, boolean isStatic, boolean isComputed, MethodDefinition.Kind kind, Expression key) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		FunctionExpression body = this.parseMethod(isGenerator, isAsync);
+		int flags = DeclarationFlags.getStatic(isStatic) | DeclarationFlags.getComputed(isComputed);
+		MethodDefinition m = new MethodDefinition(loc, flags, kind, key, body);
+		return this.finishNode(m);
+	}
+
+	protected Identifier parseClassId(boolean isStatement) {
+		if (this.type == TokenType.name)
+			return this.parseIdent(false);
+		if (isStatement)
+			this.unexpected();
+		return null;
+	}
+
+	protected Expression parseClassSuper() {
+		return this.eat(TokenType._extends) ? this.parseExprSubscripts(null) : null;
+	}
+
+	// Parses module export declaration.
+	protected ExportDeclaration parseExport(Position startLoc, Set<String> exports) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		this.next();
+		return parseExportRest(loc, exports);
+	}
+
+	/**
+	 * Parse the body of an {@code export} declaration, assuming that the {@code export}
+	 * keyword itself has already been consumed.
+	 */
+	protected ExportDeclaration parseExportRest(SourceLocation loc, Set<String> exports) {
+		Position exportRestLoc = startLoc;
+		// export * from '...'
+		if (this.eat(TokenType.star)) {
+			return parseExportAll(loc, exportRestLoc, exports);
+		}
+		if (this.eat(TokenType._default)) { // export default ...
+			this.checkExport(exports, "default", this.lastTokStartLoc);
+			boolean isAsync = false;
+			Node declaration;
+			if (this.type == TokenType._function || (isAsync = this.isAsyncFunction())) {
+				Position startLoc = this.startLoc;
+				this.next();
+				if (isAsync)
+					this.next();
+				FunctionExpression fe = (FunctionExpression) this.parseFunction(startLoc, false, false, isAsync);
+				if (fe.hasId())
+					declaration = new FunctionDeclaration(fe.getLoc(), fe.getId(), fe.getRawParameters(), (BlockStatement) fe.getBody(),
+							fe.isGenerator(), fe.isAsync());
+				else
+					declaration = fe;
+			} else if (this.type == TokenType._class) {
+				ClassExpression ce = (ClassExpression) parseClass(this.startLoc, false);
+				if (ce.getClassDef().hasId())
+					declaration = new ClassDeclaration(ce.getLoc(), ce.getClassDef(), noDeclareKeyword, notAbstract);
+				else
+					declaration = ce;
+			} else {
+				declaration = this.parseMaybeAssign(false, null, null);
+				this.semicolon();
+			}
+			return this.finishNode(new ExportDefaultDeclaration(loc, declaration));
+		}
+		// export var|const|let|function|class ...
+		Statement declaration;
+		List<ExportSpecifier> specifiers;
+		Expression source = null;
+		if (this.shouldParseExportStatement()) {
+			declaration = this.parseStatement(true, false);
+			if (declaration == null)
+				return null;
+			if (declaration instanceof VariableDeclaration) {
+				checkVariableExport(exports, ((VariableDeclaration)declaration).getDeclarations());
+			} else {
+				Identifier id = getId(declaration);
+				if (id != null)
+					checkExport(exports, id.getName(), id.getLoc().getStart());
+			}
+			specifiers = new ArrayList<ExportSpecifier>();
+			source = null;
+		} else { // export { x, y as z } [from '...']
+			declaration = null;
+			specifiers = this.parseExportSpecifiers(exports);
+			source = parseExportFrom(specifiers, source, false);
+		}
+		return this.finishNode(new ExportNamedDeclaration(loc, declaration, specifiers, (Literal) source));
+	}
+
+	protected Expression parseExportFrom(List<ExportSpecifier> specifiers, Expression source, boolean expectFrom) {
+		if (this.eatContextual("from")) {
+			if (this.type == TokenType.string)
+				source = this.parseExprAtom(null);
+			else
+				this.unexpected();
+		} else {
+			if (expectFrom)
+				this.unexpected();
+
+			// check for keywords used as local names
+			for (ExportSpecifier specifier : specifiers) {
+				String localName = specifier.getLocal().getName();
+				if (this.keywords.contains(localName) || this.reservedWords.contains(localName)) {
+					this.unexpected(specifier.getLoc().getStart());
+				}
+			}
+
+			source = null;
+		}
+		this.semicolon();
+		return source;
+	}
+
+	protected ExportDeclaration parseExportAll(SourceLocation loc, Position starLoc, Set<String> exports) {
+		Expression source = parseExportFrom(null, null, true);
+		return this.finishNode(new ExportAllDeclaration(loc, (Literal)source));
+	}
+
+	private void checkExport(Set<String> exports, String name, Position pos) {
+		if (exports == null)
+			return;
+		if (exports.contains(name))
+			raiseRecoverable(pos.getOffset(), "Duplicate export '" + name + "'");
+		exports.add(name);
+	}
+
+	private void checkPatternExport(Set<String> exports, Expression pat) {
+		if (pat instanceof Identifier) {
+			checkExport(exports, ((Identifier) pat).getName(), pat.getLoc().getStart());
+		} else if (pat instanceof ObjectPattern) {
+			for (Property prop : ((ObjectPattern) pat).getProperties())
+				checkPatternExport(exports, prop.getValue());
+		} else if (pat instanceof ArrayPattern) {
+			for (Expression elt : ((ArrayPattern) pat).getElements())
+				if (elt != null)
+					checkPatternExport(exports, elt);
+		} else if (pat instanceof AssignmentPattern) {
+			checkPatternExport(exports, ((AssignmentPattern) pat).getLeft());
+		} else if (pat instanceof ParenthesizedExpression) {
+			checkPatternExport(exports, ((ParenthesizedExpression) pat).getExpression());
+		}
+	}
+
+	private void checkVariableExport(Set<String> exports, List<VariableDeclarator> decls) {
+		if (exports == null)
+			return;
+		for (VariableDeclarator decl : decls)
+			checkPatternExport(exports, (Expression) decl.getId());
+	}
+
+	protected boolean shouldParseExportStatement() {
+		return this.type.keyword != null || this.isLet() || this.isAsyncFunction();
+	}
+
+	// Parses a comma-separated list of module exports.
+	protected List<ExportSpecifier> parseExportSpecifiers(Set<String> exports) {
+		List<ExportSpecifier> nodes = new ArrayList<ExportSpecifier>();
+		boolean first = true;
+		// export { x, y as z } [from '...']
+		this.expect(TokenType.braceL);
+		while (!this.eat(TokenType.braceR)) {
+			if (!first) {
+				this.expect(TokenType.comma);
+				if (this.afterTrailingComma(TokenType.braceR, false))
+					break;
+			} else {
+				first = false;
+			}
+
+			SourceLocation loc = new SourceLocation(this.startLoc);
+			Identifier local = this.parseIdent(this.type == TokenType._default);
+			Identifier exported = this.eatContextual("as") ? this.parseIdent(true) : local;
+			checkExport(exports, exported.getName(), exported.getLoc().getStart());
+			nodes.add(this.finishNode(new ExportSpecifier(loc, local, exported)));
+		}
+		return nodes;
+	}
+
+	// Parses import declaration.
+	protected Statement parseImport(Position startLoc) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		this.next();
+		return parseImportRest(loc);
+	}
+
+	protected ImportDeclaration parseImportRest(SourceLocation loc) {
+		List<ImportSpecifier> specifiers;
+		Literal source;
+		// import '...'
+		if (this.type == TokenType.string) {
+			specifiers = new ArrayList<ImportSpecifier>();
+			source = (Literal) this.parseExprAtom(null);
+		} else {
+			specifiers = this.parseImportSpecifiers();
+			this.expectContextual("from");
+			if (this.type != TokenType.string)
+				this.unexpected();
+			source = (Literal) this.parseExprAtom(null);
+		}
+		this.semicolon();
+		if (specifiers == null)
+			return null;
+		return this.finishNode(new ImportDeclaration(loc, specifiers, source));
+	}
+
+	// Parses a comma-separated list of module imports.
+	protected List<ImportSpecifier> parseImportSpecifiers() {
+		List<ImportSpecifier> nodes = new ArrayList<ImportSpecifier>();
+		boolean first = true;
+		if (this.type == TokenType.name) {
+			// import defaultObj, { x, y as z } from '...'
+			SourceLocation loc = new SourceLocation(this.startLoc);
+			Identifier local = this.parseIdent(false);
+			this.checkLVal(local, true, null);
+			nodes.add(this.finishNode(new ImportDefaultSpecifier(loc, local)));
+			if (!this.eat(TokenType.comma))
+				return nodes;
+		}
+		if (this.type == TokenType.star) {
+			SourceLocation loc = new SourceLocation(this.startLoc);
+			this.next();
+			this.expectContextual("as");
+			Identifier local = this.parseIdent(false);
+			this.checkLVal(local, true, null);
+			nodes.add(this.finishNode(new ImportNamespaceSpecifier(loc, local)));
+			return nodes;
+		}
+		this.expect(TokenType.braceL);
+		while (!this.eat(TokenType.braceR)) {
+			if (!first) {
+				this.expect(TokenType.comma);
+				if (this.afterTrailingComma(TokenType.braceR, false))
+					break;
+			} else {
+				first = false;
+			}
+
+			ImportSpecifier importSpecifier = parseImportSpecifier();
+			if (importSpecifier != null)
+				nodes.add(importSpecifier);
+		}
+		return nodes;
+	}
+
+	protected ImportSpecifier parseImportSpecifier() {
+		SourceLocation loc = new SourceLocation(this.startLoc);
+		Identifier imported = this.parseIdent(true), local;
+		if (this.eatContextual("as")) {
+			local = this.parseIdent(false);
+		} else {
+			local = imported;
+			if (this.keywords.contains(local.getName()))
+				this.unexpected(local.getLoc().getStart());
+			if (this.reservedWordsStrict.contains(local.getName()))
+				this.raiseRecoverable(local, "The keyword '" + local.getName() + "' is reserved");
+		}
+		this.checkLVal(local, true, null);
+		return this.finishNode(new ImportSpecifier(loc, imported, local));
+	}
+
+	/// end statement.js
+
+	/// helpers
+	protected Number parseInt(String s, int radix) {
+		return stringToNumber(s, 0, radix);
+	}
+
+	protected Number parseFloat(String s) {
+		try {
+			return Double.valueOf(s);
+		} catch (NumberFormatException nfe) {
+			this.raise(this.start, "Invalid number");
+			return null;
+		}
+	}
+
+	protected int charAt(int i) {
+		if (i < input.length())
+			return input.charAt(i);
+		else
+			return -1;
+	}
+
+	protected String inputSubstring(int start, int end) {
+		if (start >= input.length())
+			return "";
+		if (end > input.length())
+			end = input.length();
+		return input.substring(start, end);
+	}
+
+	protected Identifier getId(Statement s) {
+		if (s instanceof ClassDeclaration)
+			return ((ClassDeclaration) s).getClassDef().getId();
+		if (s instanceof FunctionDeclaration)
+			return ((FunctionDeclaration) s).getId();
+		return null;
+	}
+
+	/*
+	 * Helper function for toNumber, parseInt, and TokenStream.getToken.
+	 *
+	 * Copied from Rhino.
+	 */
+	private static double stringToNumber(String s, int start, int radix) {
+		char digitMax = '9';
+		char lowerCaseBound = 'a';
+		char upperCaseBound = 'A';
+		int len = s.length();
+		if (radix < 10) {
+			digitMax = (char) ('0' + radix - 1);
+		}
+		if (radix > 10) {
+			lowerCaseBound = (char) ('a' + radix - 10);
+			upperCaseBound = (char) ('A' + radix - 10);
+		}
+		int end;
+		double sum = 0.0;
+		for (end=start; end < len; end++) {
+			char c = s.charAt(end);
+			int newDigit;
+			if ('0' <= c && c <= digitMax)
+				newDigit = c - '0';
+			else if ('a' <= c && c < lowerCaseBound)
+				newDigit = c - 'a' + 10;
+			else if ('A' <= c && c < upperCaseBound)
+				newDigit = c - 'A' + 10;
+			else
+				break;
+			sum = sum*radix + newDigit;
+		}
+		if (start == end) {
+			return Double.NaN;
+		}
+		if (sum >= 9007199254740992.0) {
+			if (radix == 10) {
+				/* If we're accumulating a decimal number and the number
+				 * is >= 2^53, then the result from the repeated multiply-add
+				 * above may be inaccurate.  Call Java to get the correct
+				 * answer.
+				 */
+				try {
+					return Double.parseDouble(s.substring(start, end));
+				} catch (NumberFormatException nfe) {
+					return Double.NaN;
+				}
+			} else if (radix == 2 || radix == 4 || radix == 8 ||
+					radix == 16 || radix == 32)
+			{
+				/* The number may also be inaccurate for one of these bases.
+				 * This happens if the addition in value*radix + digit causes
+				 * a round-down to an even least significant mantissa bit
+				 * when the first dropped bit is a one.  If any of the
+				 * following digits in the number (which haven't been added
+				 * in yet) are nonzero then the correct action would have
+				 * been to round up instead of down.  An example of this
+				 * occurs when reading the number 0x1000000000000081, which
+				 * rounds to 0x1000000000000000 instead of 0x1000000000000100.
+				 */
+				int bitShiftInChar = 1;
+				int digit = 0;
+
+				final int SKIP_LEADING_ZEROS = 0;
+				final int FIRST_EXACT_53_BITS = 1;
+				final int AFTER_BIT_53         = 2;
+				final int ZEROS_AFTER_54 = 3;
+				final int MIXED_AFTER_54 = 4;
+
+				int state = SKIP_LEADING_ZEROS;
+				int exactBitsLimit = 53;
+				double factor = 0.0;
+				boolean bit53 = false;
+				// bit54 is the 54th bit (the first dropped from the mantissa)
+				boolean bit54 = false;
+
+				for (;;) {
+					if (bitShiftInChar == 1) {
+						if (start == end)
+							break;
+						digit = s.charAt(start++);
+						if ('0' <= digit && digit <= '9')
+							digit -= '0';
+						else if ('a' <= digit && digit <= 'z')
+							digit -= 'a' - 10;
+						else
+							digit -= 'A' - 10;
+						bitShiftInChar = radix;
+					}
+					bitShiftInChar >>= 1;
+						boolean bit = (digit & bitShiftInChar) != 0;
+
+						switch (state) {
+						case SKIP_LEADING_ZEROS:
+							if (bit) {
+								--exactBitsLimit;
+								sum = 1.0;
+								state = FIRST_EXACT_53_BITS;
+							}
+							break;
+						case FIRST_EXACT_53_BITS:
+							sum *= 2.0;
+							if (bit)
+								sum += 1.0;
+							--exactBitsLimit;
+							if (exactBitsLimit == 0) {
+								bit53 = bit;
+								state = AFTER_BIT_53;
+							}
+							break;
+						case AFTER_BIT_53:
+							bit54 = bit;
+							factor = 2.0;
+							state = ZEROS_AFTER_54;
+							break;
+						case ZEROS_AFTER_54:
+							if (bit) {
+								state = MIXED_AFTER_54;
+							}
+							// fallthrough
+						case MIXED_AFTER_54:
+							factor *= 2;
+							break;
+						}
+				}
+				switch (state) {
+				case SKIP_LEADING_ZEROS:
+					sum = 0.0;
+					break;
+				case FIRST_EXACT_53_BITS:
+				case AFTER_BIT_53:
+					// do nothing
+					break;
+				case ZEROS_AFTER_54:
+					// x1.1 -> x1 + 1 (round up)
+					// x0.1 -> x0 (round down)
+					if (bit54 & bit53)
+						sum += 1.0;
+					sum *= factor;
+					break;
+				case MIXED_AFTER_54:
+					// x.100...1.. -> x + 1 (round up)
+					// x.0anything -> x (round down)
+					if (bit54)
+						sum += 1.0;
+					sum *= factor;
+					break;
+				}
+			}
+			/* We don't worry about inaccurate numbers for any other base. */
+		}
+		return sum;
+	}
+
+	/**
+	 * Return the next {@code n} characters of lookahead (or as many as are
+	 * available), after skipping over whitespace and comments.
+	 */
+	protected String lookahead(int n, boolean allowNewline) {
+		Matcher m = (allowNewline ? Whitespace.skipWhiteSpace : Whitespace.skipWhiteSpaceNoNewline).matcher(this.input);
+		m.find(this.pos);
+		return this.inputSubstring(m.end(), m.end()+n);
+	}
+
+	/**
+	 * Is the next input token (after skipping over whitespace and comments)
+	 * the identifier {@code name}?
+	 */
+	protected boolean lookaheadIsIdent(String name, boolean allowNewline) {
+		int n = name.length();
+		String lh = lookahead(n+1, allowNewline);
+		return lh.startsWith(name) &&
+				(lh.length() == n || !Identifiers.isIdentifierChar(lh.codePointAt(n), true));
+	}
+
+	// getters and setters
+	public void pushTokenContext(TokContext ctxt) {
+		this.context.push(ctxt);
+	}
+
+	public TokContext popTokenContext() {
+		return this.context.pop();
+	}
+
+	public void exprAllowed(boolean exprAllowed) {
+		this.exprAllowed = exprAllowed;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/README.md b/javascript/extractor/src/com/semmle/jcorn/README.md
new file mode 100644
index 00000000000..7d1cd38a351
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/README.md
@@ -0,0 +1 @@
+This directory contains the source code of the JavaScript parser used by the JavaScript extractor, which is essentially a Java port of [acorn](https://github.com/acornjs/acorn) and [acorn-jsx](https://github.com/RReverser/acorn-jsx) (both developed under an MIT license) with a few custom extensions.
diff --git a/javascript/extractor/src/com/semmle/jcorn/SyntaxError.java b/javascript/extractor/src/com/semmle/jcorn/SyntaxError.java
new file mode 100644
index 00000000000..994eaccd5ec
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/SyntaxError.java
@@ -0,0 +1,18 @@
+package com.semmle.jcorn;
+
+import com.semmle.js.ast.Position;
+
+public class SyntaxError extends RuntimeException {
+	private static final long serialVersionUID = -4883173648492364902L;
+
+	private final Position position;
+
+	public SyntaxError(String msg, Position loc, int raisedAt) {
+		super(msg);
+		this.position = loc;
+	}
+
+	public Position getPosition() {
+		return position;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/TokenType.java b/javascript/extractor/src/com/semmle/jcorn/TokenType.java
new file mode 100644
index 00000000000..3cced9b72f5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/TokenType.java
@@ -0,0 +1,279 @@
+package com.semmle.jcorn;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.semmle.jcorn.Parser.TokContext;
+
+/// tokentype.js
+
+// ## Token types
+
+// The assignment of fine-grained, information-carrying type objects
+// allows the tokenizer to store the information it has about a
+// token in a way that is very cheap for the parser to look up.
+
+// All token type variables start with an underscore, to make them
+// easy to recognize.
+
+// The `beforeExpr` property is used to disambiguate between regular
+// expressions and divisions. It is set on all token types that can
+// be followed by an expression (thus, a slash after them would be a
+// regular expression).
+//
+// The `startsExpr` property is used to check if the token ends a
+// `yield` expression. It is set on all token types that either can
+// directly start an expression (like a quotation mark) or can
+// continue an expression (like the body of a string).
+//
+// `isLoop` marks a keyword as starting a loop, which is important
+// to know when parsing a label, in order to allow or disallow
+// continue jumps to that label.
+
+public class TokenType {
+	// Map keyword names to token types.
+	public static final Map<String, TokenType> keywords = new LinkedHashMap<>();
+
+	public static final TokenType
+	num = new TokenType(new Properties("num").startsExpr()),
+	bigint = new TokenType(new Properties("bigint").startsExpr()),
+	regexp = new TokenType(new Properties("regexp").startsExpr()),
+	string = new TokenType(new Properties("string").startsExpr()),
+	name = new TokenType(new Properties("name").startsExpr()),
+	eof = new TokenType(new Properties("eof")),
+
+	// Punctuation token types.
+	bracketL = new TokenType(new Properties("[").beforeExpr().startsExpr()),
+	bracketR = new TokenType(new Properties("]")),
+	braceL = new TokenType(new Properties("{").beforeExpr().startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			parser.context.push(parser.braceIsBlock(prevType) ? TokContext.b_stat : TokContext.b_expr);
+			parser.exprAllowed = true;
+		}
+	},
+	braceR = new TokenType(new Properties("}")) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			updateParenBraceRContext(parser);
+		}
+	},
+	parenL = new TokenType(new Properties("(").beforeExpr().startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			boolean statementParens = prevType == TokenType._if || prevType == TokenType._for || prevType == TokenType._with || prevType == TokenType._while;
+			parser.context.push(statementParens ? TokContext.p_stat : TokContext.p_expr);
+			parser.exprAllowed = true;
+		}
+	},
+	parenR = new TokenType(new Properties(")")) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			updateParenBraceRContext(parser);
+		}
+	},
+	comma = new TokenType(new Properties(",").beforeExpr()),
+	semi = new TokenType(new Properties(";").beforeExpr()),
+	colon = new TokenType(new Properties(":").beforeExpr()),
+	dot = new TokenType(new Properties(".")),
+	question = new TokenType(new Properties("?").beforeExpr()),
+	arrow = new TokenType(new Properties("=>").beforeExpr()),
+	template = new TokenType(new Properties("template")),
+	invalidTemplate = new TokenType(new Properties("invalidTemplate")),
+	ellipsis = new TokenType(new Properties("...").beforeExpr()),
+	backQuote = new TokenType(new Properties("`").startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			if (parser.curContext() == TokContext.q_tmpl)
+				parser.context.pop();
+			else
+				parser.context.push(TokContext.q_tmpl);
+			parser.exprAllowed = false;
+		}
+	},
+	dollarBraceL = new TokenType(new Properties("${").beforeExpr().startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			parser.context.push(TokContext.b_tmpl);
+			parser.exprAllowed = true;
+		}
+	},
+
+	// Operators. These carry several kinds of properties to help the
+	// parser use them properly (the presence of these properties is
+	// what categorizes them as operators).
+	//
+	// `binop`, when present, specifies that this operator is a binary
+	// operator, and will refer to its precedence.
+	//
+	// `prefix` and `postfix` mark the operator as a prefix or postfix
+	// unary operator.
+	//
+	// `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as
+	// binary operators with a very low precedence, that should result
+	// in AssignmentExpression nodes.
+
+	eq = new TokenType(new Properties("=").beforeExpr().isAssign()),
+	assign = new TokenType(new Properties("_=").beforeExpr().isAssign()),
+	incDec = new TokenType(new Properties("++/--").prefix().postfix().startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			// exprAllowed stays unchanged
+		}
+	},
+	prefix = new TokenType(new Properties("prefix").beforeExpr().prefix().startsExpr()),
+	logicalOR = new TokenType(binop("||", 1)),
+	logicalAND = new TokenType(binop("&&", 2)),
+	bitwiseOR = new TokenType(binop("|", 3)),
+	bitwiseXOR = new TokenType(binop("^", 4)),
+	bitwiseAND = new TokenType(binop("&", 5)),
+	equality = new TokenType(binop("==/!=", 6)),
+	relational = new TokenType(binop("</>", 7)),
+	bitShift = new TokenType(binop("<</>>", 8)),
+	plusMin = new TokenType(new Properties("+/-").beforeExpr().binop(9).prefix().startsExpr()),
+	modulo= new TokenType(binop("%", 10)),
+	star= new TokenType(binop("*", 10)),
+	slash= new TokenType(binop("/", 10)),
+	starstar = new TokenType(new Properties("**").beforeExpr()),
+	_break = new TokenType(kw("break")),
+	_case = new TokenType(kw("case").beforeExpr()),
+	_catch = new TokenType(kw("catch")),
+	_continue = new TokenType(kw("continue")),
+	_debugger = new TokenType(kw("debugger")),
+	_default = new TokenType(kw("default").beforeExpr()),
+	_do = new TokenType(kw("do").isLoop().beforeExpr()),
+	_else = new TokenType(kw("else").beforeExpr()),
+	_finally = new TokenType(kw("finally")),
+	_for = new TokenType(kw("for").isLoop()),
+	_function = new TokenType(kw("function").startsExpr()) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			if (prevType.beforeExpr && prevType != TokenType.semi && prevType != TokenType._else &&
+					!((prevType == TokenType.colon || prevType == TokenType.braceL) && parser.curContext() == TokContext.b_stat))
+				parser.context.push(TokContext.f_expr);
+			parser.exprAllowed = false;
+		}
+	},
+	_if = new TokenType(kw("if")),
+	_return = new TokenType(kw("return").beforeExpr()),
+	_switch = new TokenType(kw("switch")),
+	_throw = new TokenType(kw("throw").beforeExpr()),
+	_try = new TokenType(kw("try")),
+	_var = new TokenType(kw("var")),
+	_const = new TokenType(kw("const")),
+	_while = new TokenType(kw("while").isLoop()),
+	_with = new TokenType(kw("with")),
+	_new = new TokenType(kw("new").beforeExpr().startsExpr()),
+	_this = new TokenType(kw("this").startsExpr()),
+	_super = new TokenType(kw("super").startsExpr()),
+	_class = new TokenType(kw("class")),
+	_extends = new TokenType(kw("extends").beforeExpr()),
+	_export = new TokenType(kw("export")),
+	_import = new TokenType(kw("import")),
+	_null = new TokenType(kw("null").startsExpr()),
+	_true = new TokenType(kw("true").startsExpr()),
+	_false = new TokenType(kw("false").startsExpr()),
+	_in = new TokenType(kw("in").beforeExpr().binop(7)),
+	_instanceof = new TokenType(kw("instanceof").beforeExpr().binop(7)),
+	_typeof = new TokenType(kw("typeof").beforeExpr().prefix().startsExpr()),
+	_void = new TokenType(kw("void").beforeExpr().prefix().startsExpr()),
+	_delete = new TokenType(kw("delete").beforeExpr().prefix().startsExpr());
+
+	public final String label, keyword;
+	public final boolean beforeExpr, startsExpr, isLoop, isAssign, isPrefix, isPostfix;
+	public final int binop;
+
+	public void updateContext(Parser parser, TokenType prevType) {
+		parser.exprAllowed = this.beforeExpr;
+	}
+
+	// Token-specific context update code
+	protected void updateParenBraceRContext(Parser parser) {
+		if (parser.context.size() == 1) {
+			parser.exprAllowed = true;
+			return;
+		}
+		TokContext out = parser.context.pop();
+		if (out == TokContext.b_stat && parser.curContext() == TokContext.f_expr) {
+			parser.context.pop();
+			parser.exprAllowed = false;
+		} else if (out == TokContext.b_tmpl) {
+			parser.exprAllowed = true;
+		} else {
+			parser.exprAllowed = !out.isExpr;
+		}
+	}
+
+	public TokenType(Properties prop) {
+		this.label = prop.label;
+		this.keyword = prop.keyword;
+		this.beforeExpr = prop.beforeExpr;
+		this.startsExpr = prop.startsExpr;
+		this.isLoop = prop.isLoop;
+		this.isAssign = prop.isAssign;
+		this.isPrefix = prop.prefix;
+		this.isPostfix = prop.postfix;
+		this.binop = prop.binop;
+		if (this.keyword != null)
+			keywords.put(this.keyword, this);
+	}
+
+	public static class Properties {
+		public String label, keyword;
+		public boolean beforeExpr, startsExpr, isLoop, isAssign, prefix, postfix;
+		public int binop;
+
+		public Properties(String label, String keyword) {
+			this.label = label;
+			this.keyword = keyword;
+		}
+
+		public Properties(String label) {
+			this(label, null);
+		}
+
+		public Properties beforeExpr() {
+			this.beforeExpr = true;
+			return this;
+		}
+
+		public Properties startsExpr() {
+			this.startsExpr = true;
+			return this;
+		}
+
+		public Properties isLoop() {
+			this.isLoop = true;
+			return this;
+		}
+
+		public Properties isAssign() {
+			this.isAssign = true;
+			return this;
+		}
+
+		public Properties prefix() {
+			this.prefix = true;
+			return this;
+		}
+
+		public Properties postfix() {
+			this.postfix = true;
+			return this;
+		}
+
+		public Properties binop(int prec) {
+			this.binop = prec;
+			return this;
+		}
+	}
+
+	private static Properties binop(String name, int prec) {
+		return new Properties(name, null).binop(prec).beforeExpr();
+	}
+
+	// Succinct definitions of keyword token types
+	private static Properties kw(String name) {
+		return new Properties(name, name);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/Whitespace.java b/javascript/extractor/src/com/semmle/jcorn/Whitespace.java
new file mode 100644
index 00000000000..c1f91bcee4d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/Whitespace.java
@@ -0,0 +1,18 @@
+package com.semmle.jcorn;
+
+import java.util.regex.Pattern;
+
+/// whitespace.js
+public class Whitespace {
+	public static final String lineBreak = "\r\n?|\n|\u2028|\u2029";
+	public static final Pattern lineBreakG = Pattern.compile(lineBreak); // global
+
+	public static boolean isNewLine(int code) {
+		return code == 10 || code == 13 || code == 0x2028 || code == 0x2029;
+	}
+
+	public static final String nonASCIIwhitespace = "\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000\ufeff";
+
+	public static final Pattern skipWhiteSpace = Pattern.compile("(?:\\s|//.*|/\\*([^*]|\\*(?!/))*\\*/)*"); // global
+	public static final Pattern skipWhiteSpaceNoNewline = Pattern.compile("(?:[ \\t\\x0B\\f]|//.*|/\\*([^*]|\\*(?!/))*\\*/)*");
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/flow/FlowParser.java b/javascript/extractor/src/com/semmle/jcorn/flow/FlowParser.java
new file mode 100644
index 00000000000..1aebb862a61
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/flow/FlowParser.java
@@ -0,0 +1,1161 @@
+package com.semmle.jcorn.flow;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.Stack;
+import java.util.function.Function;
+import java.util.regex.Matcher;
+
+import com.semmle.jcorn.ESNextParser;
+import com.semmle.jcorn.Identifiers;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.SyntaxError;
+import com.semmle.jcorn.TokenType;
+import com.semmle.jcorn.TokenType.Properties;
+import com.semmle.jcorn.Whitespace;
+import com.semmle.js.ast.ExportDeclaration;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.FieldDefinition;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.MethodDefinition;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Token;
+import com.semmle.util.exception.Exceptions;
+
+/**
+ * Java port of the <a href="https://github.com/babel/babylon">Babylon</a>
+ * <a href="https://github.com/babel/babylon/blob/master/src/plugins/flow.js">Flow plugin</a>.
+ * All Flow annotations are simply discarded after parsing.
+ */
+public class FlowParser extends ESNextParser {
+	private boolean inType = false, noAnonFunctionType = false;
+
+	private static final TokenType braceBarL = new TokenType(new Properties("{|").beforeExpr().startsExpr());
+	private static final TokenType braceBarR = new TokenType(new Properties("|}"));
+
+	public FlowParser(Options options, String input, int startPos) {
+		super(options, input, startPos);
+	}
+
+	@Override
+	protected Token getTokenFromCode(int code) {
+		if (code == '{' && charAt(this.pos+1) == '|') {
+			this.pos += 2;
+			return this.finishToken(braceBarL);
+		} else if (code == '|' && charAt(this.pos+1) == '}') {
+			this.pos += 2;
+			return this.finishToken(braceBarR);
+		}
+		return super.getTokenFromCode(code);
+	}
+
+	/**
+	 * Utility class for saving the parser state so we can later either restore
+	 * it by calling method {@link #reset()}, or commit to the new state by
+	 * calling method {@link #commit()}.
+	 */
+	private class State {
+		private boolean exprAllowed;
+		private int pos, lineStart, curLine, start, end, potentialArrowAt;
+		private TokenType type;
+		private Object value;
+		private Position startLoc, endLoc, lastTokEndLoc, lastTokStartLoc;
+		private int lastTokStart, lastTokEnd;
+		private Stack<TokContext> context;
+		private Function<Token, Void> onToken;
+		private boolean inType, noAnonFunctionType;
+		private List<Token> tokens = new ArrayList<Token>();
+
+		private State() {
+			this.exprAllowed = FlowParser.this.exprAllowed;
+			this.pos = FlowParser.this.pos;
+			this.lineStart = FlowParser.this.lineStart;
+			this.curLine = FlowParser.this.curLine;
+			this.start = FlowParser.this.start;
+			this.end = FlowParser.this.end;
+			this.potentialArrowAt = FlowParser.this.potentialArrowAt;
+			this.type = FlowParser.this.type;
+			this.value = FlowParser.this.value;
+			this.startLoc = FlowParser.this.startLoc;
+			this.endLoc = FlowParser.this.endLoc;
+			this.lastTokEndLoc = FlowParser.this.lastTokEndLoc;
+			this.lastTokStartLoc = FlowParser.this.lastTokStartLoc;
+			this.lastTokStart = FlowParser.this.lastTokStart;
+			this.lastTokEnd = FlowParser.this.lastTokEnd;
+			this.context = new Stack<TokContext>();
+			this.context.addAll(FlowParser.this.context);
+			this.inType = FlowParser.this.inType;
+			this.noAnonFunctionType = FlowParser.this.noAnonFunctionType;
+
+			// buffer tokens while we are in speculative mode
+			this.onToken = options.onToken();
+			options.onToken((tk) -> { tokens.add(tk); return null; });
+		}
+
+		private void reset() {
+			FlowParser.this.exprAllowed = this.exprAllowed;
+			FlowParser.this.pos = this.pos;
+			FlowParser.this.lineStart = this.lineStart;
+			FlowParser.this.curLine = this.curLine;
+			FlowParser.this.start = this.start;
+			FlowParser.this.end = this.end;
+			FlowParser.this.potentialArrowAt = this.potentialArrowAt;
+			FlowParser.this.type = this.type;
+			FlowParser.this.value = this.value;
+			FlowParser.this.startLoc = this.startLoc;
+			FlowParser.this.endLoc = this.endLoc;
+			FlowParser.this.lastTokEndLoc = this.lastTokEndLoc;
+			FlowParser.this.lastTokStartLoc = this.lastTokStartLoc;
+			FlowParser.this.lastTokStart = this.lastTokStart;
+			FlowParser.this.lastTokEnd = this.lastTokEnd;
+			FlowParser.this.context = this.context;
+			options.onToken(this.onToken);
+			FlowParser.this.inType = this.inType;
+			FlowParser.this.noAnonFunctionType = this.noAnonFunctionType;
+		}
+
+		private void commit() {
+			// commit buffered tokens
+			options.onToken(this.onToken);
+			if (this.onToken != null)
+				for (Token tk : tokens)
+					this.onToken.apply(tk);
+		}
+	}
+
+	private boolean isRelational(String op) {
+		return this.type == TokenType.relational && op.equals(value);
+	}
+
+	private void expectRelational(String op) {
+		if (isRelational(op))
+			next();
+		else
+			unexpected();
+	}
+
+	private void flowParseTypeInitialiser(TokenType tok, boolean allowLeadingPipeOrAnd) {
+		boolean oldInType = inType;
+		inType = true;
+		this.expect(tok == null ? TokenType.colon : tok);
+		if (allowLeadingPipeOrAnd) {
+			if (this.type == TokenType.bitwiseAND || this.type == TokenType.bitwiseOR) {
+				this.next();
+			}
+		}
+		this.flowParseType();
+		inType = oldInType;
+	}
+
+	private void flowParseDeclareClass(Position start) {
+		this.next();
+		this.flowParseInterfaceish(start, true);
+	}
+
+	private void flowParseDeclareFunction(Position start) {
+		this.next();
+
+		Identifier id = this.parseIdent(false);
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+
+		this.expect(TokenType.parenL);
+		this.flowParseFunctionTypeParams();
+		this.expect(TokenType.parenR);
+		this.flowParseTypeInitialiser(null, false);
+
+		this.finishNode(id);
+
+		this.semicolon();
+	}
+
+	private void flowParseDeclare(Position start) {
+		if (this.type == TokenType._class) {
+			this.flowParseDeclareClass(start);
+		} else if (this.type == TokenType._function) {
+			this.flowParseDeclareFunction(start);
+		} else if (this.type == TokenType._var) {
+			this.flowParseDeclareVariable(start);
+		} else if (this.isContextual("module")) {
+			if (".".equals(lookahead(1)))
+				this.flowParseDeclareModuleExports();
+			else
+				this.flowParseDeclareModule(start);
+		} else if (this.isContextual("type")) {
+			this.flowParseDeclareTypeAlias(start);
+		} else if (this.isContextual("opaque")) {
+			this.flowParseDeclareOpaqueType(start);
+		} else if (this.isContextual("interface")) {
+			this.flowParseDeclareInterface(start);
+		} else if (this.type == TokenType._export) {
+			this.flowParseDeclareExportDeclaration(start);
+		} else {
+			this.unexpected();
+		}
+	}
+
+	private void flowParseDeclareVariable(Position start) {
+		this.next();
+		this.flowParseTypeAnnotatableIdentifier(false, false);
+		this.semicolon();
+	}
+
+	private void flowParseDeclareModule(Position start) {
+		this.next();
+
+		if (this.type == TokenType.string) {
+			this.parseExprAtom(null);
+		} else {
+			this.parseIdent(false);
+		}
+
+		this.expect(TokenType.braceL);
+		while (this.type != TokenType.braceR) {
+			Position stmtStart = startLoc;
+
+			// todo: declare check
+			this.next();
+
+			this.flowParseDeclare(stmtStart);
+		}
+		this.expect(TokenType.braceR);
+	}
+
+	private void flowParseDeclareModuleExports() {
+		this.expectContextual("module");
+		this.expect(TokenType.dot);
+		this.expectContextual("exports");
+		this.flowParseTypeAnnotation();
+		this.semicolon();
+	}
+
+	private void flowParseDeclareTypeAlias(Position start) {
+		this.next();
+		this.flowParseTypeAlias(start);
+	}
+
+	private void flowParseDeclareOpaqueType(Position start) {
+		this.next();
+		this.flowParseOpaqueType(start, true);
+	}
+
+	private void flowParseDeclareInterface(Position start) {
+		this.next();
+		this.flowParseInterfaceish(start, false);
+	}
+
+	private boolean match(TokenType tt) {
+		return this.type == tt;
+	}
+
+	private void flowParseDeclareExportDeclaration(Position start) {
+		this.expect(TokenType._export);
+
+		if (this.eat(TokenType._default)) {
+			if (this.match(TokenType._function) || this.match(TokenType._class)) {
+				// declare export default class ...
+				// declare export default function ...
+				this.flowParseDeclare(this.startLoc);
+			} else {
+				// declare export default [type];
+				this.flowParseType();
+				this.semicolon();
+			}
+			return;
+		} else {
+			if (this.match(TokenType._const) || this.isContextual("let")) {
+				this.unexpected();
+			}
+
+			if (this.match(TokenType._var) || // declare export var ...
+				this.match(TokenType._function) || // declare export function ...
+				this.match(TokenType._class) || // declare export class ...
+				this.isContextual("opaque") // declare export opaque ..
+				) {
+				this.flowParseDeclare(this.startLoc);
+				return;
+			} else if (this.match(TokenType.star) || // declare export * from ''
+						this.match(TokenType.braceL) || // declare export {} ...
+						this.isContextual("interface") || // declare export interface ...
+						this.isContextual("type") || // declare export type ...
+						this.isContextual("opaque") // declare export opaque type ...
+						) {
+				this.parseExportRest(new SourceLocation(start), new LinkedHashSet<>());
+				return;
+			}
+		}
+
+		this.unexpected();
+	}
+
+	// Interfaces
+
+	private void flowParseInterfaceish(Position start, boolean allowStatic) {
+		this.parseIdent(false);
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+
+		if (this.eat(TokenType._extends)) {
+			do {
+				this.flowParseInterfaceExtends();
+			} while (this.eat(TokenType.comma));
+		}
+
+		if (this.isContextual("mixins")) {
+			this.next();
+			do {
+				this.flowParseInterfaceExtends();
+			} while (this.eat(TokenType.comma));
+		}
+
+		this.flowParseObjectType(allowStatic, false, false);
+	}
+
+	private void flowParseInterfaceExtends() {
+		this.flowParseQualifiedTypeIdentifier(null);
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterInstantiation();
+		}
+	}
+
+	private void flowParseQualifiedTypeIdentifier(Identifier id) {
+		if (id == null)
+			this.parseIdent(false);
+
+		while (this.eat(TokenType.dot))
+			this.parseIdent(false);
+	}
+
+	private void flowParseInterface(Position start) {
+		this.flowParseInterfaceish(start, false);
+	}
+
+	// Type aliases
+
+	private void flowParseTypeAlias(Position start) {
+		this.parseIdent(false);
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+
+		this.flowParseTypeInitialiser(
+				TokenType.eq,
+				/*allowLeadingPipeOrAnd*/ true
+				);
+		this.semicolon();
+	}
+
+	private void flowParseOpaqueType(Position start, boolean declare) {
+		this.expectContextual("type");
+		this.parseIdent(false);
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+
+		// Parse the supertype
+		if (this.type == TokenType.colon) {
+			this.flowParseTypeInitialiser(TokenType.colon, false);
+		}
+
+		if (!declare) {
+			this.flowParseTypeInitialiser(TokenType.eq, false);
+		}
+
+		this.semicolon();
+	}
+
+	// Type annotations
+
+	private void flowParseTypeParameter() {
+		this.eat(TokenType.plusMin);
+
+		this.flowParseTypeAnnotatableIdentifier(false, false);
+
+		if (this.eat(TokenType.eq)) {
+			this.flowParseType();
+		}
+	}
+
+	private void flowParseTypeParameterDeclaration() {
+		if (this.isRelational("<") || this.type == jsxTagStart) {
+			this.next();
+		} else {
+			this.unexpected();
+		}
+
+		do {
+			this.flowParseTypeParameter();
+			if (!this.isRelational(">")) {
+				this.expect(TokenType.comma);
+			}
+		} while (!this.isRelational(">"));
+		this.expectRelational(">");
+	}
+
+	private void flowParseTypeParameterInstantiation() {
+		boolean oldInType = inType;
+
+		inType = true;
+
+		this.expectRelational("<");
+		while (!this.isRelational(">")) {
+			this.flowParseType();
+			if (!this.isRelational(">")) {
+				this.expect(TokenType.comma);
+			}
+		}
+		this.expectRelational(">");
+
+		inType = oldInType;
+	}
+
+	private void flowParseObjectPropertyKey() {
+		if (this.type == TokenType.num || this.type == TokenType.string) {
+			this.parseExprAtom(null);
+		} else if ("@@iterator".equals(inputSubstring(start, start+10))) {
+			// allow `@@iterator` as property name; this doesn't appear to be standard Flow syntax,
+			// but is used a few times in react-native
+			this.expect(at);
+			this.expect(at);
+			this.expect(TokenType.name);
+		} else {
+			this.parseIdent(true);
+		}
+	}
+
+	private void flowParseObjectTypeIndexer(Position start, boolean isStatic) {
+		this.expect(TokenType.bracketL);
+		if (":".equals(lookahead(1))) {
+			this.flowParseObjectPropertyKey();
+			this.flowParseTypeInitialiser(null, false);
+		} else {
+			this.flowParseType();
+		}
+		this.expect(TokenType.bracketR);
+		this.flowParseTypeInitialiser(null, false);
+
+		this.flowObjectTypeSemicolon();
+	}
+
+	private void flowParseObjectTypeMethodish(Position start) {
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+
+		this.expect(TokenType.parenL);
+		while (this.type != TokenType.ellipsis && this.type != TokenType.parenR) {
+			this.flowParseFunctionTypeParam();
+			if (this.type != TokenType.parenR) {
+				this.expect(TokenType.comma);
+			}
+		}
+
+		if (this.eat(TokenType.ellipsis)) {
+			this.flowParseFunctionTypeParam();
+		}
+		this.expect(TokenType.parenR);
+		this.flowParseTypeInitialiser(null, false);
+	}
+
+	private void flowParseObjectTypeMethod(Position start, boolean isStatic) {
+		this.flowParseObjectTypeMethodish(start);
+		this.flowObjectTypeSemicolon();
+	}
+
+	private void flowParseObjectTypeCallProperty(Position start, boolean isStatic) {
+		this.flowParseObjectTypeMethodish(start);
+		this.flowObjectTypeSemicolon();
+	}
+
+	private void flowParseObjectType(boolean allowStatic, boolean allowExact, boolean allowSpread) {
+		boolean isStatic = false;
+
+		TokenType endDelim;
+		if (allowExact && this.eat(braceBarL)) {
+			endDelim = braceBarR;
+		} else {
+			this.expect(TokenType.braceL);
+			endDelim = TokenType.braceR;
+		}
+
+		while (this.type != endDelim) {
+			Position innerStart = startLoc;
+			if (allowStatic && this.isContextual("static")) {
+				this.next();
+				isStatic = true;
+			}
+
+			// variance annotation
+			this.eat(TokenType.plusMin);
+
+			if (this.type == TokenType.bracketL) {
+				this.flowParseObjectTypeIndexer(innerStart, isStatic);
+			} else if (this.type == TokenType.parenL || this.isRelational("<")) {
+				this.flowParseObjectTypeCallProperty(innerStart, allowStatic);
+			} else {
+				if (isStatic && this.type == TokenType.colon) {
+					this.parseIdent(false);
+				} else if (allowSpread && this.eat(TokenType.ellipsis)) {
+					flowParseType();
+					flowObjectTypeSemicolon();
+					continue;
+				} else {
+					this.flowParseObjectPropertyKey();
+				}
+				if (this.isRelational("<") || this.type == TokenType.parenL) {
+					// This is a method property
+					this.flowParseObjectTypeMethod(innerStart, isStatic);
+				} else {
+					if (this.eat(TokenType.question)) {
+						// do something
+					}
+					this.flowParseTypeInitialiser(null, false);
+					this.flowObjectTypeSemicolon();
+				}
+			}
+		}
+
+		this.expect(endDelim);
+	}
+
+	private void flowObjectTypeSemicolon() {
+		if (!this.eat(TokenType.semi) && !this.eat(TokenType.comma) &&
+				this.type != TokenType.braceR && this.type != braceBarR) {
+			this.unexpected();
+		}
+	}
+
+	private void flowParseGenericType(Position start) {
+		while (this.eat(TokenType.dot)) {
+			this.parseIdent(false);
+		}
+
+		if (this.isRelational("<")) {
+			this.flowParseTypeParameterInstantiation();
+		}
+	}
+
+	private void flowParseTypeofType() {
+		this.expect(TokenType._typeof);
+		this.flowParsePrimaryType();
+	}
+
+	private void flowParseTupleType() {
+		this.expect(TokenType.bracketL);
+		// We allow trailing commas
+		while (this.pos < this.input.length() && this.type != TokenType.bracketR) {
+			this.flowParseType();
+			if (this.type == TokenType.bracketR)
+				break;
+			this.expect(TokenType.comma);
+		}
+		this.expect(TokenType.bracketR);
+	}
+
+	private void flowParseFunctionTypeParam() {
+		String lh = lookahead(1);
+		if (":".equals(lh) || "?".equals(lh)) {
+			this.parseIdent(false);
+			this.eat(TokenType.question);
+			this.flowParseTypeInitialiser(null, false);
+		} else {
+			flowParseType();
+		}
+	}
+
+	private void flowParseFunctionTypeParams() {
+		while (this.type != TokenType.parenR && this.type != TokenType.ellipsis) {
+			this.flowParseFunctionTypeParam();
+			if (this.type != TokenType.parenR) {
+				this.expect(TokenType.comma);
+			}
+		}
+		if (this.eat(TokenType.ellipsis)) {
+			this.flowParseFunctionTypeParam();
+		}
+	}
+
+	private void flowIdentToTypeAnnotation(Position start, Identifier id) {
+		switch (id.getName()) {
+		case "any":
+			return;
+
+		case "void":
+			return;
+
+		case "bool":
+		case "boolean":
+			return;
+
+		case "mixed":
+			return;
+
+		case "number":
+			return;
+
+		case "string":
+			return;
+
+		default:
+			this.flowParseGenericType(start);
+		}
+	}
+
+	private String lookahead(int n) {
+		Matcher m = Whitespace.skipWhiteSpace.matcher(this.input);
+		if (m.find(this.pos))
+			return inputSubstring(m.end(), m.end()+n);
+		return "";
+	}
+
+	// The parsing of types roughly parallels the parsing of expressions, and
+	// primary types are kind of like primary expressions...they're the
+	// primitives with which other types are constructed.
+	private void flowParsePrimaryType() {
+		Position start = startLoc;
+		boolean isGroupedType = false;
+		boolean oldNoAnonFunctionType = noAnonFunctionType;
+
+		if (this.type == TokenType.name) {
+			this.flowIdentToTypeAnnotation(start, this.parseIdent(false));
+			return;
+		} else if (this.type == TokenType._void) {
+			this.next();
+			return;
+		} else if (this.type == TokenType.braceL) {
+			this.flowParseObjectType(false, false, true);
+			return;
+		} else if (this.type == braceBarL) {
+			this.flowParseObjectType(false, true, true);
+			return;
+		} else if (this.type == TokenType.bracketL) {
+			this.flowParseTupleType();
+			return;
+		} else if (this.type == TokenType.relational) {
+			if ("<".equals(this.value)) {
+				this.flowParseTypeParameterDeclaration();
+				this.expect(TokenType.parenL);
+				this.flowParseFunctionTypeParams();
+				this.expect(TokenType.parenR);
+
+				this.expect(TokenType.arrow);
+
+				this.flowParseType();
+				return;
+			} else {
+				this.unexpected();
+			}
+		} else if (this.type == TokenType.parenL) {
+			this.next();
+
+			// Check to see if this is actually a grouped type
+			if (this.type != TokenType.parenR && this.type != TokenType.ellipsis) {
+				if (this.type == TokenType.name) {
+					String lh = lookahead(1);
+					if ("?".equals(lh) || ":".equals(lh)) {
+						isGroupedType = false;
+					} else {
+						isGroupedType = true;
+					}
+				} else {
+					isGroupedType = true;
+				}
+			}
+
+			if (isGroupedType) {
+				this.noAnonFunctionType = false;
+				this.flowParseType();
+				this.noAnonFunctionType = oldNoAnonFunctionType;
+
+				if (noAnonFunctionType ||
+						!(this.type == TokenType.comma ||
+						(this.type == TokenType.parenR && "=>".equals(lookahead(2))))) {
+					this.expect(TokenType.parenR);
+					return;
+				} else {
+					// Eat a comma if there is one
+					this.eat(TokenType.comma);
+				}
+			}
+
+			this.flowParseFunctionTypeParams();
+
+			this.expect(TokenType.parenR);
+
+			this.expect(TokenType.arrow);
+
+			this.flowParseType();
+			return;
+		} else if (this.type == TokenType.string) {
+			this.next();
+			return;
+		} else if (this.type == TokenType._true || this.type == TokenType._false) {
+			this.next();
+			return;
+		} else if (this.type == TokenType.plusMin || this.type == TokenType.num) {
+			if ("-".equals(this.value)) {
+				this.next();
+				if (this.type != TokenType.num)
+					this.unexpected();
+				this.next();
+				return;
+			}
+
+			this.next();
+			return;
+		} else if (this.type == TokenType._null) {
+			this.next();
+			return;
+		} else if (this.type == TokenType._this) {
+			this.next();
+			return;
+		} else if (this.type == TokenType.star) {
+			this.next();
+			return;
+		} else if ("typeof".equals(this.type.keyword)) {
+			this.flowParseTypeofType();
+			return;
+		}
+
+		this.unexpected();
+	}
+
+	private void flowParsePostfixType() {
+		this.flowParsePrimaryType();
+		if (this.type == TokenType.bracketL) {
+			this.expect(TokenType.bracketL);
+			this.expect(TokenType.bracketR);
+		}
+	}
+
+	private void flowParsePrefixType() {
+		if (this.eat(TokenType.question)) {
+			this.flowParsePrefixType();
+		} else {
+			this.flowParsePostfixType();
+		}
+	}
+
+	private void flowParseIntersectionType() {
+		this.eat(TokenType.bitwiseAND);
+		this.flowParseAnonFunctionWithoutParens();
+		while (this.eat(TokenType.bitwiseAND)) {
+			this.flowParseAnonFunctionWithoutParens();
+		}
+	}
+
+	private void flowParseAnonFunctionWithoutParens() {
+		this.flowParsePrefixType();
+		if (!noAnonFunctionType && eat(TokenType.arrow))
+			flowParseType();
+	}
+
+	private void flowParseUnionType() {
+		this.eat(TokenType.bitwiseOR);
+		this.flowParseIntersectionType();
+		while (this.eat(TokenType.bitwiseOR)) {
+			this.flowParseIntersectionType();
+		}
+	}
+
+	private void flowParseType() {
+		boolean oldInType = inType;
+		inType = true;
+		this.flowParseUnionType();
+		inType = oldInType;
+	}
+
+	private void flowParseTypeAnnotation() {
+		this.flowParseTypeInitialiser(null, false);
+	}
+
+	private void flowParseTypeAnnotatableIdentifier(boolean requireTypeAnnotation, boolean canBeOptionalParam) {
+		this.parseIdent(false);
+		if (canBeOptionalParam && this.eat(TokenType.question)) {
+			this.expect(TokenType.question);
+		}
+
+		if (requireTypeAnnotation || this.type == TokenType.colon) {
+			this.flowParseTypeAnnotation();
+		}
+	}
+
+	/** Should Flow syntax be allowed? */
+	private boolean flow() {
+		return options.esnext();
+	}
+
+	@Override
+	protected Node parseFunctionBody(Identifier id, List<Expression> params, boolean isArrowFunction) {
+		// plain function return types: `function name(): string {}`
+		if (flow() && this.type == TokenType.colon) {
+			// if allowExpression is true then we're parsing an arrow function and if
+			// there's a return type then it's been handled elsewhere
+			this.flowParseTypeAnnotation();
+		}
+
+		return super.parseFunctionBody(id, params, isArrowFunction);
+	}
+
+	// interfaces
+	@Override
+	protected Statement parseStatement(boolean declaration, boolean topLevel, Set<String> exports) {
+		// strict mode handling of `interface` since it's a reserved word
+		if (flow() && declaration && this.strict && this.type == TokenType.name && "interface".equals(this.value)) {
+			Position start = startLoc;
+			this.next();
+			this.flowParseInterface(start);
+			return null;
+		} else {
+			return super.parseStatement(declaration, topLevel, exports);
+		}
+	};
+
+
+	// declares, interfaces and type aliases
+	@Override
+	protected ExpressionStatement parseExpressionStatement(boolean declaration, Position start, Expression expr) {
+		if (flow() && declaration && expr instanceof Identifier) {
+			String name = ((Identifier) expr).getName();
+			if ("declare".equals(name)) {
+				if (this.type == TokenType._class || this.type == TokenType.name ||
+						this.type == TokenType._function || this.type == TokenType._var || this.type == TokenType._export) {
+					this.flowParseDeclare(start);
+					return null;
+				}
+			} else if (this.type == TokenType.name) {
+				if ("interface".equals(name)) {
+					this.flowParseInterface(start);
+					return null;
+				} else if ("type".equals(name)) {
+					this.flowParseTypeAlias(start);
+					return null;
+				} else if ("opaque".equals(name)) {
+					this.flowParseOpaqueType(start, false);
+					return null;
+				}
+			}
+		}
+
+		return super.parseExpressionStatement(declaration, start, expr);
+	}
+
+	// export type
+	@Override
+	protected boolean shouldParseExportStatement() {
+		return flow() && (this.isContextual("type") || this.isContextual("interface") || this.isContextual("opaque"))
+				|| super.shouldParseExportStatement();
+	}
+
+	@Override
+	protected Expression parseParenItem(Expression left, int startPos, Position startLoc) {
+		Expression node = super.parseParenItem(left, startPos, startLoc);
+
+		if (flow()) {
+			if (this.eat(TokenType.question)) {
+				// do something with the information
+			}
+
+			if (this.type == TokenType.colon) {
+				this.flowParseTypeAnnotation();
+			}
+		}
+
+		return node;
+	};
+
+	@Override
+	protected ExportDeclaration parseExportRest(SourceLocation loc, Set<String> exports) {
+		if (flow() && (this.type.keyword != null || shouldParseExportStatement())) {
+			Position start = startLoc;
+			if (this.isContextual("type")) {
+				this.next();
+
+				if (this.type == TokenType.braceL) {
+					// `export type { foo, bar };`
+					List<ExportSpecifier> specifiers = this.parseExportSpecifiers(exports);
+					this.parseExportFrom(specifiers, null, false);
+					return null;
+				} else {
+					// `export type Foo = Bar;`
+					this.flowParseTypeAlias(startLoc);
+					return null;
+				}
+			} else if (this.isContextual("opaque")) {
+				this.next();
+				this.flowParseOpaqueType(start, false);
+				return null;
+			} else if (this.isContextual("interface")) {
+				this.next();
+				this.flowParseInterface(start);
+				return null;
+			}
+		}
+		return super.parseExportRest(loc, exports);
+	}
+
+	@Override
+	protected Identifier parseClassId(boolean isStatement) {
+		Identifier id = super.parseClassId(isStatement);
+		if (flow() && this.isRelational("<"))
+			this.flowParseTypeParameterDeclaration();
+		return id;
+	}
+
+	// don't consider `void` to be a keyword as then it'll use the void token type
+	// and set startExpr
+	@Override
+	protected boolean isKeyword(String src) {
+		if (inType && "void".equals(src))
+			return false;
+		return super.isKeyword(src);
+	}
+
+	// ensure that inside flow types, we bypass the jsx parser plugin
+	@Override
+	protected Token readToken(int code) {
+		if (this.inType && (code == 62 || code == 60)) {
+			return this.finishOp(TokenType.relational, 1);
+		} else {
+			return super.readToken(code);
+		}
+	}
+
+	@Override
+	protected MethodDefinition parseClassMethod(Position startLoc, boolean isGenerator, boolean isAsync, boolean isStatic, boolean isComputed, MethodDefinition.Kind kind, Expression key) {
+		if (flow() && this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+		}
+		return super.parseClassMethod(startLoc, isGenerator, isAsync, isStatic, isComputed, kind, key);
+	}
+
+	// parse a the super class type parameters and implements
+	@Override
+	protected Expression parseClassSuper() {
+		Expression ext = super.parseClassSuper();
+		if (flow() && ext != null && this.isRelational("<"))
+			this.flowParseTypeParameterInstantiation();
+		if (flow() && this.isContextual("implements")) {
+			this.next();
+			do {
+				this.parseIdent(false);
+				if (this.isRelational("<"))
+					this.flowParseTypeParameterInstantiation();
+			} while (this.eat(TokenType.comma));
+		}
+		return ext;
+	}
+
+	@Override
+	protected Expression processBindingListItem(Expression param) {
+		if (flow()) {
+			if (this.eat(TokenType.question)) {
+				// do something
+			}
+			if (this.type == TokenType.colon) {
+				this.flowParseTypeAnnotation();
+			}
+			this.finishNode(param);
+		}
+		return param;
+	}
+
+	@Override
+	protected List<ImportSpecifier> parseImportSpecifiers() {
+		String kind = null;
+		if (flow()) {
+			if (this.type == TokenType._typeof) {
+				kind = "typeof";
+			} else if (this.isContextual("type")) {
+				kind = "type";
+			}
+			if (kind != null) {
+				String lh = lookahead(4);
+				if (!lh.isEmpty()) {
+					int c = lh.codePointAt(0);
+					if ((Identifiers.isIdentifierStart(c, true) && !"from".equals(lh)) || c == '{' || c == '*') {
+						this.next();
+					}
+				}
+			}
+		}
+
+		List<ImportSpecifier> specs = super.parseImportSpecifiers();
+		if (kind != null || specs.isEmpty())
+			return null;
+		return specs;
+	}
+
+	@Override
+	protected ImportSpecifier parseImportSpecifier() {
+		if (this.type == TokenType._typeof || this.isContextual("type")) {
+			String lh = lookahead(2);
+			if (lh.charAt(0) == ',' || lh.charAt(0) == '}' || lh.equals("as"))
+				return super.parseImportSpecifier();
+			this.next();
+			super.parseImportSpecifier();
+			return null;
+		} else {
+			return super.parseImportSpecifier();
+		}
+	}
+
+	@Override
+	protected List<Expression> parseFunctionParams() {
+		if (flow()) {
+			boolean oldInType = this.inType;
+			this.inType = true;
+			if (this.isRelational("<")) {
+				this.flowParseTypeParameterDeclaration();
+			}
+			this.inType = oldInType;
+		}
+		return super.parseFunctionParams();
+	}
+
+	// parse flow type annotations on variable declarator heads - let foo: string = bar
+	@Override
+	protected Expression parseVarId() {
+		Expression varId = super.parseVarId();
+		if (flow() && this.type == TokenType.colon) {
+			this.flowParseTypeAnnotation();
+			this.finishNode(varId);
+		}
+		return varId;
+	}
+
+	@Override
+	protected Expression parseBindingAtom() {
+		Expression bindingAtom = super.parseBindingAtom();
+		if (flow()) {
+			if (this.eat(TokenType.question)) {
+				// do something
+			}
+			if (this.type == TokenType.colon) {
+				this.flowParseTypeAnnotation();
+			}
+			this.finishNode(bindingAtom);
+		}
+		return bindingAtom;
+	}
+
+	@Override
+	protected Expression processExprListItem(Expression item) {
+		if (flow()) {
+			if (this.eat(TokenType.question)) {
+				// do something
+			}
+			if (this.type == TokenType.colon) {
+				this.flowParseTypeAnnotation();
+			}
+			this.finishNode(item);
+		}
+		return item;
+	}
+
+	@Override
+	protected Expression parseConditionalRest(boolean noIn, Position start, Expression test) {
+		if (flow()) {
+			if (this.type == TokenType.colon) {
+				this.flowParseTypeAnnotation();
+				return test;
+			} else if (this.type == TokenType.comma || this.type == TokenType.parenR) {
+				return test;
+			}
+		}
+		return super.parseConditionalRest(noIn, start, test);
+	}
+
+	@Override
+	protected ParenthesisedExpressions parseParenthesisedExpressions(DestructuringErrors refDestructuringErrors) {
+		ParenthesisedExpressions pe = super.parseParenthesisedExpressions(refDestructuringErrors);
+
+		// handle return types for arrow functions
+		if (flow() && this.type == TokenType.colon) {
+			// This is a tricky case: we have parsed `c ? (e) :`
+			// We could be in the middle of parsing an arrow expression with a declared
+			// return type (that is, we are expecting to see `t => b : f`, with `t` the
+			// declared return type, `b` the body of the arrow expression, and `f` the
+			// "else" branch of the conditional expression), or we could be done parsing
+			// the "then" branch of the conditional (that is, we are expecting to see the
+			// "else" branch `f`).
+			// We model the behaviour of Babel and Flow by trying to parse the following
+			// tokens as a type annotation followed by an arrow token. If this fails, we
+			// backtrack.
+			State backup = new State();
+			try {
+				boolean oldNoAnonFunctionType = noAnonFunctionType;
+				noAnonFunctionType = true;
+				flowParseTypeAnnotation();
+				noAnonFunctionType = oldNoAnonFunctionType;
+				if (this.type != TokenType.arrow)
+					unexpected();
+				backup.commit();
+			} catch (SyntaxError e) {
+				Exceptions.ignore(e, "Backtracking parser.");
+				backup.reset();
+			}
+		}
+
+		return pe;
+	}
+
+	@Override
+	protected boolean shouldParseAsyncArrow() {
+		if (flow() && this.type == TokenType.colon) {
+			boolean oldNoAnonFunctionType = noAnonFunctionType;
+			noAnonFunctionType = true;
+			this.flowParseTypeAnnotation();
+			noAnonFunctionType = oldNoAnonFunctionType;
+		}
+		return super.shouldParseAsyncArrow();
+	}
+
+	@Override
+	protected boolean isClassProperty() {
+		return flow() && this.type == TokenType.colon || super.isClassProperty();
+	}
+
+	@Override
+	protected FieldDefinition parseFieldDefinition(PropertyInfo pi, boolean isStatic) {
+		if (flow() && this.type == TokenType.colon) {
+			this.flowParseTypeAnnotation();
+		}
+		return super.parseFieldDefinition(pi, isStatic);
+	}
+
+	// parse type parameters for object method shorthand
+	@Override
+	protected void parsePropertyValue(PropertyInfo pi,
+			DestructuringErrors refDestructuringErrors) {
+		// method shorthand
+		if (flow() && this.isRelational("<")) {
+			this.flowParseTypeParameterDeclaration();
+			if (this.type != TokenType.parenL) this.unexpected();
+		}
+
+		super.parsePropertyValue(pi, refDestructuringErrors);
+	}
+
+	@Override
+	protected void parsePropertyName(PropertyInfo result) {
+		if (flow())
+			this.eat(TokenType.plusMin);
+		super.parsePropertyName(result);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/jsx/JSXOptions.java b/javascript/extractor/src/com/semmle/jcorn/jsx/JSXOptions.java
new file mode 100644
index 00000000000..3319c24e06e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/jsx/JSXOptions.java
@@ -0,0 +1,24 @@
+package com.semmle.jcorn.jsx;
+
+import com.semmle.jcorn.Options;
+
+public class JSXOptions extends Options {
+	public boolean allowNamespacedObjects = true, allowNamespaces = true;
+
+	public JSXOptions() {
+	}
+
+	public JSXOptions(Options options) {
+		super(options);
+	}
+
+	public JSXOptions allowNamespacedObjects(boolean allowNamespacedObjects) {
+		this.allowNamespacedObjects = allowNamespacedObjects;
+		return this;
+	}
+
+	public JSXOptions allowNamespaces(boolean allowNamespaces) {
+		this.allowNamespaces = allowNamespaces;
+		return this;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/jsx/JSXParser.java b/javascript/extractor/src/com/semmle/jcorn/jsx/JSXParser.java
new file mode 100644
index 00000000000..3442462a639
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/jsx/JSXParser.java
@@ -0,0 +1,457 @@
+package com.semmle.jcorn.jsx;
+
+import static com.semmle.jcorn.Parser.TokContext.b_expr;
+import static com.semmle.jcorn.Parser.TokContext.b_tmpl;
+import static com.semmle.jcorn.TokenType.braceL;
+import static com.semmle.jcorn.TokenType.braceR;
+import static com.semmle.jcorn.TokenType.colon;
+import static com.semmle.jcorn.TokenType.dot;
+import static com.semmle.jcorn.TokenType.ellipsis;
+import static com.semmle.jcorn.TokenType.eq;
+import static com.semmle.jcorn.TokenType.relational;
+import static com.semmle.jcorn.TokenType.slash;
+import static com.semmle.jcorn.TokenType.string;
+import static com.semmle.jcorn.Whitespace.isNewLine;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+import java.util.regex.Pattern;
+
+import com.semmle.jcorn.Identifiers;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.Parser;
+import com.semmle.jcorn.TokenType;
+import com.semmle.jcorn.TokenType.Properties;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Token;
+import com.semmle.js.ast.jsx.IJSXAttribute;
+import com.semmle.js.ast.jsx.IJSXName;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+
+/**
+ * Java port of <a href="https://github.com/RReverser/acorn-jsx">Acorn-JSX</a> as of version
+ * <a href="https://github.com/RReverser/acorn-jsx/commit/05852d8ae9476b7f8a25e417665e2265528d5fb9">3.0.1</a>.
+ *
+ * Like the plain JavaScript {@link Parser}, the JSX parser is parameterized by an {@link Options}
+ * object. To enable JSX parsing, pass in a {@link JSXOptions} object.
+ */
+public class JSXParser extends Parser {
+	private static final Pattern hexNumber = Pattern.compile("^[\\da-fA-F]+$");
+	private static final Pattern decimalNumber = Pattern.compile("^\\d+$");
+
+	public JSXParser(Options options, String input, int startPos) {
+		super(options, input, startPos);
+	}
+
+	private static final TokContext j_oTag = new TokContext("<tag", false);
+	private static final TokContext j_cTag = new TokContext("</tag", false);
+	private static final TokContext j_expr = new TokContext("<tag>..</tag>", true, true, null);
+
+	private static final TokenType jsxName = new TokenType(new Properties("jsxName"));
+	public static final TokenType jsxText = new TokenType(new Properties("jsxText").beforeExpr());
+	protected static final TokenType jsxTagStart = new TokenType(new Properties("jsxTagStart")) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			parser.pushTokenContext(j_expr); // treat as beginning of JSX expression
+			parser.pushTokenContext(j_oTag); // start opening tag context
+			parser.exprAllowed(false);
+		}
+	};
+	private static final TokenType jsxTagEnd = new TokenType(new Properties("jsxTagEnd")) {
+		@Override
+		public void updateContext(Parser parser, TokenType prevType) {
+			TokContext out = parser.popTokenContext();
+			if (out == j_oTag && prevType == slash || out == j_cTag) {
+				parser.popTokenContext();
+				parser.exprAllowed(parser.curContext() == j_expr);
+			} else {
+				parser.exprAllowed(true);
+			}
+		}
+	};
+
+	/**
+	 * Reads inline JSX contents token.
+	 */
+	private Token jsx_readToken() {
+		StringBuilder out = new StringBuilder();
+		int chunkStart = this.pos;
+		for (;;) {
+			if (this.pos >= this.input.length())
+				this.raise(this.start, "Unterminated JSX contents");
+			int ch = this.charAt(this.pos);
+
+			switch (ch) {
+			case 60: // '<'
+			case 123: // '{'
+				if (this.pos == this.start) {
+					if (ch == 60 && this.exprAllowed) {
+						++this.pos;
+						return this.finishToken(jsxTagStart);
+					}
+					return this.getTokenFromCode(ch);
+				}
+				out.append(inputSubstring(chunkStart, this.pos));
+				return this.finishToken(jsxText, out.toString());
+
+			case 38: // '&'
+				out.append(inputSubstring(chunkStart, this.pos));
+				out.append(this.jsx_readEntity());
+				chunkStart = this.pos;
+				break;
+
+			default:
+				if (isNewLine(ch)) {
+					out.append(inputSubstring(chunkStart, this.pos));
+					out.append(this.jsx_readNewLine(true));
+					chunkStart = this.pos;
+				} else {
+					++this.pos;
+				}
+			}
+		}
+	}
+
+	private String jsx_readNewLine(boolean normalizeCRLF) {
+		int ch = this.charAt(this.pos);
+		String out;
+		++this.pos;
+		if (ch == 13 && this.charAt(this.pos) == 10) {
+			++this.pos;
+			out = normalizeCRLF ? "\n" : "\r\n";
+		} else {
+			out = String.valueOf((char)ch);
+		}
+		++this.curLine;
+		this.lineStart = this.pos;
+
+		return out;
+	}
+
+	private Token jsx_readString(char quote) {
+		StringBuilder out = new StringBuilder();
+		int chunkStart = ++this.pos;
+		for (;;) {
+			if (this.pos >= this.input.length())
+				this.raise(this.start, "Unterminated string constant");
+			int ch = this.charAt(this.pos);
+			if (ch == quote) break;
+			if (ch == 38) { // '&'
+				out.append(inputSubstring(chunkStart, this.pos));
+				out.append(this.jsx_readEntity());
+				chunkStart = this.pos;
+			} else if (isNewLine(ch)) {
+				out.append(inputSubstring(chunkStart, this.pos));
+				out.append(this.jsx_readNewLine(false));
+				chunkStart = this.pos;
+			} else {
+				++this.pos;
+			}
+		}
+		out.append(inputSubstring(chunkStart, this.pos++));
+		return this.finishToken(string, out.toString());
+	}
+
+	private String jsx_readEntity() {
+		int ch = this.charAt(this.pos);
+		if (ch != '&')
+			this.raise(this.pos, "Entity must start with an ampersand");
+		int startPos = ++this.pos;
+		String entity = null;
+		int semi = this.input.indexOf(';', startPos);
+		if (semi != -1) {
+			String entityName = inputSubstring(startPos, semi);
+			if (entityName.startsWith("#x")) {
+				entityName = entityName.substring(2);
+				if (hexNumber.matcher(entityName).matches())
+					entity = codePointToString(parseInt(entityName, 16).intValue());
+			} else if (entityName.startsWith("#")) {
+				entityName = entityName.substring(1);
+				if (decimalNumber.matcher(entityName).matches())
+					entity = codePointToString(parseInt(entityName, 10).intValue());
+			} else {
+				Character entityChar = XHTMLEntities.ENTITIES.get(entityName);
+				if (entityChar != null)
+					entity = String.valueOf(entityChar);
+			}
+		}
+
+		if (entity == null) {
+			this.pos = startPos;
+			return "&";
+		} else {
+			this.pos = semi+1;
+			return entity;
+		}
+	}
+
+	/**
+	 * Read a JSX identifier (valid tag or attribute name).
+	 *
+	 * Optimized version since JSX identifiers can't contain
+	 * escape characters and so can be read as single slice.
+	 * Also assumes that first character was already checked
+	 * by isIdentifierStart in readToken.
+	 */
+	private Token jsx_readWord() {
+		int ch, start = this.pos;
+		do {
+			ch = this.charAt(++this.pos);
+		} while (Identifiers.isIdentifierChar(ch, true) || ch == 45); // '-'
+		return this.finishToken(jsxName, inputSubstring(start, this.pos));
+	}
+
+	/** Transforms JSX element name to string; {@code null} is transformed to {@code null}. */
+	private String getQualifiedJSXName(Object object) {
+		if (object == null)
+			return null;
+		return ((IJSXName) object).getQualifiedName();
+	}
+
+	/** Parse next token as JSX identifier */
+	private JSXIdentifier jsx_parseIdentifier() {
+		SourceLocation loc = new SourceLocation(this.startLoc);
+		String name = null;
+		if (this.type == jsxName)
+			name = String.valueOf(this.value);
+		else if (this.type.keyword != null)
+			name = this.type.keyword;
+		else
+			this.unexpected();
+		this.next();
+		return this.finishNode(new JSXIdentifier(loc, name));
+	}
+
+	/** Parse namespaced identifier. */
+	private IJSXName jsx_parseNamespacedName() {
+		SourceLocation loc = new SourceLocation(this.startLoc);
+		JSXIdentifier namespace = this.jsx_parseIdentifier();
+		if (!((JSXOptions)options).allowNamespaces || !this.eat(colon))
+			return namespace;
+		return this.finishNode(new JSXNamespacedName(loc, namespace, this.jsx_parseIdentifier()));
+	}
+
+	/**
+	 * Parses element name in any form - namespaced, member
+	 * or single identifier. If the next token is a tag-end token,
+	 * {@code null} is returned; this happens with fragments.
+	 */
+	private IJSXName jsx_parseElementName () {
+		if (this.type == jsxTagEnd)
+			return null;
+		Position startPos = this.startLoc;
+		IJSXName node = this.jsx_parseNamespacedName();
+		if (this.type == dot && node instanceof JSXNamespacedName && !((JSXOptions)options).allowNamespacedObjects) {
+			this.unexpected();
+		}
+		while (this.eat(dot)) {
+			SourceLocation loc = new SourceLocation(startPos);
+			node = this.finishNode(new JSXMemberExpression(loc, node, this.jsx_parseIdentifier()));
+		}
+		return node;
+	}
+
+	/** Parses any type of JSX attribute value. */
+	private INode jsx_parseAttributeValue() {
+		if (type == braceL) {
+			JSXExpressionContainer node = this.jsx_parseExpressionContainer();
+			if (node.getExpression() instanceof JSXEmptyExpression)
+				this.raise(node, "JSX attributes must only be assigned a non-empty expression");
+			return node;
+		} else if (type == jsxTagStart || type == string) {
+			return this.parseExprAtom(null);
+		} else {
+			this.raise(this.start, "JSX value should be either an expression or a quoted JSX text");
+			return null;
+		}
+	}
+
+	/**
+	 * JSXEmptyExpression is unique type since it doesn't actually parse anything,
+	 * and so it should start at the end of last read token (left brace) and finish
+	 * at the beginning of the next one (right brace).
+	 */
+	private JSXEmptyExpression jsx_parseEmptyExpression() {
+		return new JSXEmptyExpression(new SourceLocation("", lastTokEndLoc, startLoc));
+	}
+
+	/** Parses JSX expression enclosed into curly brackets. */
+	private JSXExpressionContainer jsx_parseExpressionContainer() {
+		SourceLocation loc = new SourceLocation(this.startLoc);
+		this.next();
+		INode expression;
+		if (this.type == braceR)
+			expression = this.jsx_parseEmptyExpression();
+		else
+			expression = this.parseExpression(false, null);
+		this.expect(braceR);
+		return this.finishNode(new JSXExpressionContainer(loc, expression));
+	}
+
+	/** Parses following JSX attribute name-value pair. */
+	private IJSXAttribute jsx_parseAttribute() {
+		SourceLocation loc = new SourceLocation(this.startLoc);
+		if (this.eat(braceL)) {
+			this.expect(ellipsis);
+			Expression argument = this.parseMaybeAssign(false, null, null);
+			this.expect(braceR);
+			return this.finishNode(new JSXSpreadAttribute(loc, argument));
+		}
+		IJSXName name = this.jsx_parseNamespacedName();
+		INode value = this.eat(eq) ? this.jsx_parseAttributeValue() : null;
+		return this.finishNode(new JSXAttribute(loc, name, value));
+	}
+
+	/** Parses JSX opening tag starting after '&lt;'. */
+	private JSXOpeningElement jsx_parseOpeningElementAt(Position startLoc) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		List<IJSXAttribute> attributes = new ArrayList<>();
+		IJSXName name = this.jsx_parseElementName();
+		while (this.type != slash && this.type != jsxTagEnd)
+			attributes.add(this.jsx_parseAttribute());
+		boolean selfClosing = this.eat(slash);
+		this.expect(jsxTagEnd);
+		return this.finishNode(new JSXOpeningElement(loc, name, attributes, selfClosing));
+	}
+
+	/** Parses JSX closing tag starting after '&lt;/'. */
+	private JSXClosingElement jsx_parseClosingElementAt(Position startLoc) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		IJSXName name = this.jsx_parseElementName();
+		this.expect(jsxTagEnd);
+		return this.finishNode(new JSXClosingElement(loc, name));
+	}
+
+	/**
+	 * Parses entire JSX element, including its opening tag
+	 * (starting after '&lt;'), attributes, contents and closing tag.
+	 */
+	private JSXElement jsx_parseElementAt(Position startLoc) {
+		SourceLocation loc = new SourceLocation(startLoc);
+		List<INode> children = new ArrayList<INode>();
+		JSXOpeningElement openingElement = this.jsx_parseOpeningElementAt(startLoc);
+		JSXClosingElement closingElement = null;
+
+		if (!openingElement.isSelfClosing()) {
+			contents:
+				for (;;) {
+					if (type == jsxTagStart) {
+						startLoc = this.startLoc;
+						this.next();
+						if (this.eat(slash)) {
+							closingElement = this.jsx_parseClosingElementAt(startLoc);
+							break contents;
+						}
+						children.add(this.jsx_parseElementAt(startLoc));
+					} else if (type ==  jsxText) {
+						children.add(this.parseExprAtom(null));
+					} else if (type == braceL) {
+						children.add(this.jsx_parseExpressionContainer());
+					} else {
+						this.unexpected();
+					}
+				}
+
+			String closingQualName = getQualifiedJSXName(openingElement.getName());
+			if (!Objects.equals(getQualifiedJSXName(closingElement.getName()), closingQualName)) {
+				// prettify for error message
+				if (closingQualName == null)
+					closingQualName = "";
+				this.raise(
+						closingElement,
+						"Expected corresponding JSX closing tag for <" + closingQualName + ">");
+			}
+		}
+
+		if (this.type == relational && "<".equals(this.value)) {
+			this.raise(this.start, "Adjacent JSX elements must be wrapped in an enclosing tag");
+		}
+		return this.finishNode(new JSXElement(loc, openingElement, children, closingElement));
+	}
+
+	/** Parses entire JSX element from current position. */
+	private JSXElement jsx_parseElement() {
+		Position startLoc = this.startLoc;
+		this.next();
+		return this.jsx_parseElementAt(startLoc);
+	}
+
+	@Override
+	protected Expression parseExprAtom(DestructuringErrors refDestructuringErrors) {
+		if (this.type == jsxText) {
+			return this.parseLiteral(this.type, this.value);
+		} else if (this.type == jsxTagStart) {
+			return this.jsx_parseElement();
+		} else {
+			return super.parseExprAtom(refDestructuringErrors); 
+		}
+	}
+
+	@Override
+	protected Token readToken(int code) {
+		TokContext context = this.curContext();
+	
+		if (context == j_expr)
+			return this.jsx_readToken();
+	
+		if (context == j_oTag || context == j_cTag) {
+			if (Identifiers.isIdentifierStart(code, true))
+				return this.jsx_readWord();
+	
+			if (code == 62) {
+				++this.pos;
+				return this.finishToken(jsxTagEnd);
+			}
+	
+			if ((code == 34 || code == 39) && context == j_oTag)
+				return this.jsx_readString((char)code);
+		}
+	
+		if (options instanceof JSXOptions && code == 60 && this.exprAllowed &&
+				// avoid getting confused on HTML comments
+				this.charAt(this.pos+1) != '!') {
+			++this.pos;
+			return this.finishToken(jsxTagStart);
+		}
+	
+		return super.readToken(code);
+	}
+
+	@Override
+	protected void updateContext(TokenType prevType) {
+		if (options instanceof JSXOptions) {
+			if (type == braceL) {
+				TokContext curContext = this.curContext();
+				if (curContext == j_oTag) {
+					this.context.push(b_expr);
+				} else if (curContext == j_expr) {
+					this.context.push(b_tmpl);
+				} else {
+					type.updateContext(this, prevType);
+				}
+				this.exprAllowed = true;
+				return;
+			} else if (type == slash && prevType == jsxTagStart) {
+				this.context.pop();
+				this.context.pop(); // do not consider JSX expr -> JSX open tag -> ... anymore
+				this.context.push(j_cTag);
+				this.exprAllowed = false;
+				return;
+			}
+		}
+		super.updateContext(prevType);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/jcorn/jsx/XHTMLEntities.java b/javascript/extractor/src/com/semmle/jcorn/jsx/XHTMLEntities.java
new file mode 100644
index 00000000000..d8f38bb81ef
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/jcorn/jsx/XHTMLEntities.java
@@ -0,0 +1,263 @@
+package com.semmle.jcorn.jsx;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+public class XHTMLEntities {
+	public static final Map<String, Character> ENTITIES = new LinkedHashMap<>();
+	static {
+		ENTITIES.put("quot", '\u0022');
+		ENTITIES.put("amp", '&');
+		ENTITIES.put("apos", '\'');
+		ENTITIES.put("lt", '<');
+		ENTITIES.put("gt", '>');
+		ENTITIES.put("nbsp", '\u00A0');
+		ENTITIES.put("iexcl", '\u00A1');
+		ENTITIES.put("cent", '\u00A2');
+		ENTITIES.put("pound", '\u00A3');
+		ENTITIES.put("curren", '\u00A4');
+		ENTITIES.put("yen", '\u00A5');
+		ENTITIES.put("brvbar", '\u00A6');
+		ENTITIES.put("sect", '\u00A7');
+		ENTITIES.put("uml", '\u00A8');
+		ENTITIES.put("copy", '\u00A9');
+		ENTITIES.put("ordf", '\u00AA');
+		ENTITIES.put("laquo", '\u00AB');
+		ENTITIES.put("not", '\u00AC');
+		ENTITIES.put("shy", '\u00AD');
+		ENTITIES.put("reg", '\u00AE');
+		ENTITIES.put("macr", '\u00AF');
+		ENTITIES.put("deg", '\u00B0');
+		ENTITIES.put("plusmn", '\u00B1');
+		ENTITIES.put("sup2", '\u00B2');
+		ENTITIES.put("sup3", '\u00B3');
+		ENTITIES.put("acute", '\u00B4');
+		ENTITIES.put("micro", '\u00B5');
+		ENTITIES.put("para", '\u00B6');
+		ENTITIES.put("middot", '\u00B7');
+		ENTITIES.put("cedil", '\u00B8');
+		ENTITIES.put("sup1", '\u00B9');
+		ENTITIES.put("ordm", '\u00BA');
+		ENTITIES.put("raquo", '\u00BB');
+		ENTITIES.put("frac14", '\u00BC');
+		ENTITIES.put("frac12", '\u00BD');
+		ENTITIES.put("frac34", '\u00BE');
+		ENTITIES.put("iquest", '\u00BF');
+		ENTITIES.put("Agrave", '\u00C0');
+		ENTITIES.put("Aacute", '\u00C1');
+		ENTITIES.put("Acirc", '\u00C2');
+		ENTITIES.put("Atilde", '\u00C3');
+		ENTITIES.put("Auml", '\u00C4');
+		ENTITIES.put("Aring", '\u00C5');
+		ENTITIES.put("AElig", '\u00C6');
+		ENTITIES.put("Ccedil", '\u00C7');
+		ENTITIES.put("Egrave", '\u00C8');
+		ENTITIES.put("Eacute", '\u00C9');
+		ENTITIES.put("Ecirc", '\u00CA');
+		ENTITIES.put("Euml", '\u00CB');
+		ENTITIES.put("Igrave", '\u00CC');
+		ENTITIES.put("Iacute", '\u00CD');
+		ENTITIES.put("Icirc", '\u00CE');
+		ENTITIES.put("Iuml", '\u00CF');
+		ENTITIES.put("ETH", '\u00D0');
+		ENTITIES.put("Ntilde", '\u00D1');
+		ENTITIES.put("Ograve", '\u00D2');
+		ENTITIES.put("Oacute", '\u00D3');
+		ENTITIES.put("Ocirc", '\u00D4');
+		ENTITIES.put("Otilde", '\u00D5');
+		ENTITIES.put("Ouml", '\u00D6');
+		ENTITIES.put("times", '\u00D7');
+		ENTITIES.put("Oslash", '\u00D8');
+		ENTITIES.put("Ugrave", '\u00D9');
+		ENTITIES.put("Uacute", '\u00DA');
+		ENTITIES.put("Ucirc", '\u00DB');
+		ENTITIES.put("Uuml", '\u00DC');
+		ENTITIES.put("Yacute", '\u00DD');
+		ENTITIES.put("THORN", '\u00DE');
+		ENTITIES.put("szlig", '\u00DF');
+		ENTITIES.put("agrave", '\u00E0');
+		ENTITIES.put("aacute", '\u00E1');
+		ENTITIES.put("acirc", '\u00E2');
+		ENTITIES.put("atilde", '\u00E3');
+		ENTITIES.put("auml", '\u00E4');
+		ENTITIES.put("aring", '\u00E5');
+		ENTITIES.put("aelig", '\u00E6');
+		ENTITIES.put("ccedil", '\u00E7');
+		ENTITIES.put("egrave", '\u00E8');
+		ENTITIES.put("eacute", '\u00E9');
+		ENTITIES.put("ecirc", '\u00EA');
+		ENTITIES.put("euml", '\u00EB');
+		ENTITIES.put("igrave", '\u00EC');
+		ENTITIES.put("iacute", '\u00ED');
+		ENTITIES.put("icirc", '\u00EE');
+		ENTITIES.put("iuml", '\u00EF');
+		ENTITIES.put("eth", '\u00F0');
+		ENTITIES.put("ntilde", '\u00F1');
+		ENTITIES.put("ograve", '\u00F2');
+		ENTITIES.put("oacute", '\u00F3');
+		ENTITIES.put("ocirc", '\u00F4');
+		ENTITIES.put("otilde", '\u00F5');
+		ENTITIES.put("ouml", '\u00F6');
+		ENTITIES.put("divide", '\u00F7');
+		ENTITIES.put("oslash", '\u00F8');
+		ENTITIES.put("ugrave", '\u00F9');
+		ENTITIES.put("uacute", '\u00FA');
+		ENTITIES.put("ucirc", '\u00FB');
+		ENTITIES.put("uuml", '\u00FC');
+		ENTITIES.put("yacute", '\u00FD');
+		ENTITIES.put("thorn", '\u00FE');
+		ENTITIES.put("yuml", '\u00FF');
+		ENTITIES.put("OElig", '\u0152');
+		ENTITIES.put("oelig", '\u0153');
+		ENTITIES.put("Scaron", '\u0160');
+		ENTITIES.put("scaron", '\u0161');
+		ENTITIES.put("Yuml", '\u0178');
+		ENTITIES.put("fnof", '\u0192');
+		ENTITIES.put("circ", '\u02C6');
+		ENTITIES.put("tilde", '\u02DC');
+		ENTITIES.put("Alpha", '\u0391');
+		ENTITIES.put("Beta", '\u0392');
+		ENTITIES.put("Gamma", '\u0393');
+		ENTITIES.put("Delta", '\u0394');
+		ENTITIES.put("Epsilon", '\u0395');
+		ENTITIES.put("Zeta", '\u0396');
+		ENTITIES.put("Eta", '\u0397');
+		ENTITIES.put("Theta", '\u0398');
+		ENTITIES.put("Iota", '\u0399');
+		ENTITIES.put("Kappa", '\u039A');
+		ENTITIES.put("Lambda", '\u039B');
+		ENTITIES.put("Mu", '\u039C');
+		ENTITIES.put("Nu", '\u039D');
+		ENTITIES.put("Xi", '\u039E');
+		ENTITIES.put("Omicron", '\u039F');
+		ENTITIES.put("Pi", '\u03A0');
+		ENTITIES.put("Rho", '\u03A1');
+		ENTITIES.put("Sigma", '\u03A3');
+		ENTITIES.put("Tau", '\u03A4');
+		ENTITIES.put("Upsilon", '\u03A5');
+		ENTITIES.put("Phi", '\u03A6');
+		ENTITIES.put("Chi", '\u03A7');
+		ENTITIES.put("Psi", '\u03A8');
+		ENTITIES.put("Omega", '\u03A9');
+		ENTITIES.put("alpha", '\u03B1');
+		ENTITIES.put("beta", '\u03B2');
+		ENTITIES.put("gamma", '\u03B3');
+		ENTITIES.put("delta", '\u03B4');
+		ENTITIES.put("epsilon", '\u03B5');
+		ENTITIES.put("zeta", '\u03B6');
+		ENTITIES.put("eta", '\u03B7');
+		ENTITIES.put("theta", '\u03B8');
+		ENTITIES.put("iota", '\u03B9');
+		ENTITIES.put("kappa", '\u03BA');
+		ENTITIES.put("lambda", '\u03BB');
+		ENTITIES.put("mu", '\u03BC');
+		ENTITIES.put("nu", '\u03BD');
+		ENTITIES.put("xi", '\u03BE');
+		ENTITIES.put("omicron", '\u03BF');
+		ENTITIES.put("pi", '\u03C0');
+		ENTITIES.put("rho", '\u03C1');
+		ENTITIES.put("sigmaf", '\u03C2');
+		ENTITIES.put("sigma", '\u03C3');
+		ENTITIES.put("tau", '\u03C4');
+		ENTITIES.put("upsilon", '\u03C5');
+		ENTITIES.put("phi", '\u03C6');
+		ENTITIES.put("chi", '\u03C7');
+		ENTITIES.put("psi", '\u03C8');
+		ENTITIES.put("omega", '\u03C9');
+		ENTITIES.put("thetasym", '\u03D1');
+		ENTITIES.put("upsih", '\u03D2');
+		ENTITIES.put("piv", '\u03D6');
+		ENTITIES.put("ensp", '\u2002');
+		ENTITIES.put("emsp", '\u2003');
+		ENTITIES.put("thinsp", '\u2009');
+		ENTITIES.put("zwnj", '\u200C');
+		ENTITIES.put("zwj", '\u200D');
+		ENTITIES.put("lrm", '\u200E');
+		ENTITIES.put("rlm", '\u200F');
+		ENTITIES.put("ndash", '\u2013');
+		ENTITIES.put("mdash", '\u2014');
+		ENTITIES.put("lsquo", '\u2018');
+		ENTITIES.put("rsquo", '\u2019');
+		ENTITIES.put("sbquo", '\u201A');
+		ENTITIES.put("ldquo", '\u201C');
+		ENTITIES.put("rdquo", '\u201D');
+		ENTITIES.put("bdquo", '\u201E');
+		ENTITIES.put("dagger", '\u2020');
+		ENTITIES.put("Dagger", '\u2021');
+		ENTITIES.put("bull", '\u2022');
+		ENTITIES.put("hellip", '\u2026');
+		ENTITIES.put("permil", '\u2030');
+		ENTITIES.put("prime", '\u2032');
+		ENTITIES.put("Prime", '\u2033');
+		ENTITIES.put("lsaquo", '\u2039');
+		ENTITIES.put("rsaquo", '\u203A');
+		ENTITIES.put("oline", '\u203E');
+		ENTITIES.put("frasl", '\u2044');
+		ENTITIES.put("euro", '\u20AC');
+		ENTITIES.put("image", '\u2111');
+		ENTITIES.put("weierp", '\u2118');
+		ENTITIES.put("real", '\u211C');
+		ENTITIES.put("trade", '\u2122');
+		ENTITIES.put("alefsym", '\u2135');
+		ENTITIES.put("larr", '\u2190');
+		ENTITIES.put("uarr", '\u2191');
+		ENTITIES.put("rarr", '\u2192');
+		ENTITIES.put("darr", '\u2193');
+		ENTITIES.put("harr", '\u2194');
+		ENTITIES.put("crarr", '\u21B5');
+		ENTITIES.put("lArr", '\u21D0');
+		ENTITIES.put("uArr", '\u21D1');
+		ENTITIES.put("rArr", '\u21D2');
+		ENTITIES.put("dArr", '\u21D3');
+		ENTITIES.put("hArr", '\u21D4');
+		ENTITIES.put("forall", '\u2200');
+		ENTITIES.put("part", '\u2202');
+		ENTITIES.put("exist", '\u2203');
+		ENTITIES.put("empty", '\u2205');
+		ENTITIES.put("nabla", '\u2207');
+		ENTITIES.put("isin", '\u2208');
+		ENTITIES.put("notin", '\u2209');
+		ENTITIES.put("ni", '\u220B');
+		ENTITIES.put("prod", '\u220F');
+		ENTITIES.put("sum", '\u2211');
+		ENTITIES.put("minus", '\u2212');
+		ENTITIES.put("lowast", '\u2217');
+		ENTITIES.put("radic", '\u221A');
+		ENTITIES.put("prop", '\u221D');
+		ENTITIES.put("infin", '\u221E');
+		ENTITIES.put("ang", '\u2220');
+		ENTITIES.put("and", '\u2227');
+		ENTITIES.put("or", '\u2228');
+		ENTITIES.put("cap", '\u2229');
+		ENTITIES.put("cup", '\u222A');
+		ENTITIES.put("'int'", '\u222B');
+		ENTITIES.put("there4", '\u2234');
+		ENTITIES.put("sim", '\u223C');
+		ENTITIES.put("cong", '\u2245');
+		ENTITIES.put("asymp", '\u2248');
+		ENTITIES.put("ne", '\u2260');
+		ENTITIES.put("equiv", '\u2261');
+		ENTITIES.put("le", '\u2264');
+		ENTITIES.put("ge", '\u2265');
+		ENTITIES.put("sub", '\u2282');
+		ENTITIES.put("sup", '\u2283');
+		ENTITIES.put("nsub", '\u2284');
+		ENTITIES.put("sube", '\u2286');
+		ENTITIES.put("supe", '\u2287');
+		ENTITIES.put("oplus", '\u2295');
+		ENTITIES.put("otimes", '\u2297');
+		ENTITIES.put("perp", '\u22A5');
+		ENTITIES.put("sdot", '\u22C5');
+		ENTITIES.put("lceil", '\u2308');
+		ENTITIES.put("rceil", '\u2309');
+		ENTITIES.put("lfloor", '\u230A');
+		ENTITIES.put("rfloor", '\u230B');
+		ENTITIES.put("lang", '\u2329');
+		ENTITIES.put("rang", '\u232A');
+		ENTITIES.put("loz", '\u25CA');
+		ENTITIES.put("spades", '\u2660');
+		ENTITIES.put("clubs", '\u2663');
+		ENTITIES.put("hearts", '\u2665');
+		ENTITIES.put("diams", '\u2666');
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/ABinaryExpression.java b/javascript/extractor/src/com/semmle/js/ast/ABinaryExpression.java
new file mode 100644
index 00000000000..77dc62130a2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ABinaryExpression.java
@@ -0,0 +1,29 @@
+package com.semmle.js.ast;
+
+/**
+ * An expression involving an operator and two operands; may be an
+ * {@link AssignmentExpression}, a {@link BinaryExpression} or a {@link LogicalExpression}.
+ */
+public abstract class ABinaryExpression extends Expression {
+	private final String operator;
+	private final Expression left, right;
+
+	public ABinaryExpression(SourceLocation loc, String type, String operator, Expression left, Expression right) {
+		super(type, loc);
+		this.operator = operator;
+		this.left = left;
+		this.right = right;
+	}
+
+	public String getOperator() {
+		return operator;
+	}
+
+	public Expression getLeft() {
+		return left;
+	}
+
+	public Expression getRight() {
+		return right;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AClass.java b/javascript/extractor/src/com/semmle/js/ast/AClass.java
new file mode 100644
index 00000000000..35267cd205b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AClass.java
@@ -0,0 +1,81 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * Common backing class for {@linkplain ClassDeclaration} and {@linkplain ClassExpression}.
+ */
+public class AClass implements INodeWithSymbol {
+	private final Identifier id;
+	private final List<TypeParameter> typeParameters;
+	private final Expression superClass;
+	private final List<ITypeExpression> superInterfaces;
+	private final ClassBody body;
+	private final List<Decorator> decorators;
+	private int typeSymbol = -1;
+
+	public AClass(Identifier id, List<TypeParameter> typeParameters, Expression superClass, List<ITypeExpression> superInterfaces,
+			ClassBody body) {
+		this.id = id;
+		this.typeParameters = typeParameters;
+		this.superClass = superClass;
+		this.superInterfaces = superInterfaces;
+		this.body = body;
+		this.decorators = new ArrayList<Decorator>();
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	public boolean hasId() {
+		return id != null;
+	}
+
+	public List<TypeParameter> getTypeParameters() {
+		return typeParameters;
+	}
+
+	public boolean hasTypeParameters() {
+		return !typeParameters.isEmpty();
+	}
+
+	public Expression getSuperClass() {
+		return superClass;
+	}
+
+	public boolean hasSuperClass() {
+		return superClass != null;
+	}
+
+	public List<ITypeExpression> getSuperInterfaces() {
+		return superInterfaces;
+	}
+
+	public ClassBody getBody() {
+		return body;
+	}
+
+	public void addDecorators(List<Decorator> decorators) {
+		this.decorators.addAll(decorators);
+	}
+
+	public List<Decorator> getDecorators() {
+		return decorators;
+	}
+
+	@Override
+	public int getSymbol() {
+		return typeSymbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.typeSymbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AFunction.java b/javascript/extractor/src/com/semmle/js/ast/AFunction.java
new file mode 100644
index 00000000000..1e5217a033c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AFunction.java
@@ -0,0 +1,144 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+public class AFunction<B> {
+	private final Identifier id;
+	private final List<IPattern> params, allParams;
+	private final List<Expression> rawParams, defaults;
+	private final IPattern rest;
+	private final B body;
+	private final boolean generator, async;
+	private final List<TypeParameter> typeParameters;
+	private final ITypeExpression returnType;
+	private final List<ITypeExpression> parameterTypes;
+	private final ITypeExpression thisParameterType;
+	private final List<DecoratorList> parameterDecorators;
+
+	public AFunction(Identifier id, List<Expression> params, B body, boolean generator, boolean async,
+			List<TypeParameter> typeParameters, List<ITypeExpression> parameterTypes, List<DecoratorList> parameterDecorators,
+			ITypeExpression returnType, ITypeExpression thisParameterType) {
+		this.id = id;
+		this.params = new ArrayList<IPattern>(params.size());
+		this.defaults = new ArrayList<Expression>(params.size());
+		this.parameterTypes = parameterTypes;
+		this.body = body;
+		this.generator = generator;
+		this.async = async;
+		this.rawParams = params;
+		this.typeParameters = typeParameters;
+		this.returnType = returnType;
+		this.thisParameterType = thisParameterType;
+		this.parameterDecorators = parameterDecorators;
+
+		IPattern rest = null;
+		for (Expression param : params) {
+			if (param instanceof RestElement) {
+				rest = (IPattern)((RestElement) param).getArgument();
+			} else if (param instanceof AssignmentPattern) {
+				AssignmentPattern ap = (AssignmentPattern) param;
+				this.params.add((IPattern)ap.getLeft());
+				this.defaults.add(ap.getRight());
+			} else {
+				// workaround for parser bug, which currently (erroneously) accepts
+				// async arrow functions with parens around their parameters
+				param = param.stripParens();
+				this.params.add((IPattern) param);
+				this.defaults.add(null);
+			}
+		}
+		this.rest = rest;
+
+		this.allParams = new ArrayList<IPattern>(this.params);
+		if (rest != null)
+			this.allParams.add(rest);
+	}
+
+	/**
+	 * Does this function have a name?
+	 */
+	public boolean hasId() {
+		return id != null;
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	public List<IPattern> getParams() {
+		return params;
+	}
+
+	public boolean hasDefault(int i) {
+		return i < defaults.size();
+	}
+
+	public Expression getDefault(int i) {
+		if (i >= defaults.size())
+			return null;
+		return defaults.get(i);
+	}
+
+	public boolean hasRest() {
+		return rest != null;
+	}
+
+	public IPattern getRest() {
+		return rest;
+	}
+
+	public B getBody() {
+		return body;
+	}
+
+	public boolean isGenerator() {
+		return generator;
+	}
+
+	public boolean isAsync() {
+		return async;
+	}
+
+	public List<IPattern> getAllParams() {
+		return allParams;
+	}
+
+	public List<Expression> getRawParams() {
+		return rawParams;
+	}
+
+	public ITypeExpression getReturnType() {
+		return returnType;
+	}
+
+	public boolean hasParameterType(int i) {
+		return getParameterType(i) != null;
+	}
+
+	public ITypeExpression getParameterType(int i) {
+		if (i >= parameterTypes.size())
+			return null;
+		return parameterTypes.get(i);
+	}
+
+	public List<ITypeExpression> getParameterTypes() {
+		return parameterTypes;
+	}
+
+	public List<TypeParameter> getTypeParameters() {
+		return typeParameters;
+	}
+
+	public ITypeExpression getThisParameterType() {
+		return thisParameterType;
+	}
+
+	public List<DecoratorList> getParameterDecorators() {
+		return parameterDecorators;
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/AFunctionExpression.java b/javascript/extractor/src/com/semmle/js/ast/AFunctionExpression.java
new file mode 100644
index 00000000000..88c57643bac
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AFunctionExpression.java
@@ -0,0 +1,65 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A function expression, which may be either an {@link ArrowFunctionExpression} or
+ * a normal {@link FunctionExpression}.
+ */
+public abstract class AFunctionExpression extends Expression implements IFunction {
+	private final AFunction<? extends Node> fn;
+	private int symbol = -1;
+
+	public AFunctionExpression(String type, SourceLocation loc, Identifier id,
+			List<Expression> params, Node body, Boolean generator, Boolean async,
+			List<TypeParameter> typeParameters, List<ITypeExpression> parameterTypes, List<DecoratorList> parameterDecorators,
+			ITypeExpression returnType, ITypeExpression thisParameterType) {
+		super(type, loc);
+		this.fn = new AFunction<Node>(id, params, body, generator == Boolean.TRUE, async == Boolean.TRUE, typeParameters, parameterTypes,
+				parameterDecorators, returnType, thisParameterType);
+	}
+
+	public AFunctionExpression(String type, SourceLocation loc, AFunction<? extends Node> fn) {
+		super(type, loc);
+		this.fn = fn;
+	}
+
+	@Override public Identifier getId()            { return fn.getId();        }
+	@Override public List<IPattern> getParams()    { return fn.getParams();    }
+	@Override public boolean hasDefault(int i)     { return fn.hasDefault(i);  }
+	@Override public Expression getDefault(int i)  { return fn.getDefault(i);  }
+	@Override public IPattern getRest()            { return fn.getRest();      }
+	@Override public Node getBody()                { return fn.getBody();      }
+	@Override public boolean hasRest()             { return fn.hasRest();      }
+	public boolean hasId()                         { return fn.hasId();        }
+	public boolean isGenerator()                   { return fn.isGenerator();  }
+	public boolean isAsync()                       { return fn.isAsync();      }
+	public List<IPattern> getAllParams()           { return fn.getAllParams(); }
+	@Override public List<Expression> getRawParameters() { return fn.getRawParams(); }
+	public ITypeExpression getReturnType()         { return fn.getReturnType(); }
+	public boolean hasParameterType(int i)         { return fn.hasParameterType(i); }
+	public ITypeExpression getParameterType(int i) { return fn.getParameterType(i); }
+	public List<ITypeExpression> getParameterTypes() { return fn.getParameterTypes(); }
+	public List<TypeParameter> getTypeParameters() { return fn.getTypeParameters(); }
+	public ITypeExpression getThisParameterType() { return fn.getThisParameterType(); }
+	public List<DecoratorList> getParameterDecorators() { return fn.getParameterDecorators(); }
+
+	@Override
+	public boolean hasDeclareKeyword() {
+		return false;
+	}
+
+	@Override
+	public int getSymbol() {
+		return symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AST2JSON.java b/javascript/extractor/src/com/semmle/js/ast/AST2JSON.java
new file mode 100644
index 00000000000..ad084f62f75
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AST2JSON.java
@@ -0,0 +1,853 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import com.semmle.js.ast.AClass;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.AssignmentPattern;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.BreakStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.ComprehensionBlock;
+import com.semmle.js.ast.ComprehensionExpression;
+import com.semmle.js.ast.ConditionalExpression;
+import com.semmle.js.ast.ContinueStatement;
+import com.semmle.js.ast.DebuggerStatement;
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.EmptyStatement;
+import com.semmle.js.ast.EnhancedForStatement;
+import com.semmle.js.ast.ExportAllDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportNamespaceSpecifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.LetExpression;
+import com.semmle.js.ast.LetStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.LogicalExpression;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.NewExpression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectExpression;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.ReturnStatement;
+import com.semmle.js.ast.SequenceExpression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Super;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TaggedTemplateExpression;
+import com.semmle.js.ast.TemplateElement;
+import com.semmle.js.ast.TemplateLiteral;
+import com.semmle.js.ast.ThisExpression;
+import com.semmle.js.ast.ThrowStatement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.ast.YieldExpression;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.util.data.StringUtil;
+
+/**
+ * Convert ASTs to their JSON representation.
+ */
+public class AST2JSON extends DefaultVisitor<Void, JsonElement> {
+	public static JsonElement convert(INode nd) {
+		return new AST2JSON().visit(nd);
+	}
+
+	private JsonElement visit(INode nd) {
+		if (nd == null)
+			return JsonNull.INSTANCE;
+		return nd.accept(this, null);
+	}
+
+	private JsonArray visit(List<? extends INode> nds) {
+		JsonArray result = new JsonArray();
+		nds.stream().forEach((nd) -> {
+			result.add(visit(nd));
+		});
+		return result;
+	}
+
+	private JsonElement visitPrimitive(Object o) {
+		if (o == null)
+			return JsonNull.INSTANCE;
+		if (o instanceof Boolean)
+			return new JsonPrimitive((Boolean) o);
+		if (o instanceof Number)
+			return new JsonPrimitive((Number) o);
+		return new JsonPrimitive(String.valueOf(o));
+	}
+
+	private JsonObject mkNode(INode nd) {
+		String type = nd.getType();
+		return mkNode(nd, type);
+	}
+
+	private JsonObject mkNode(INode nd, String type) {
+		JsonObject result = new JsonObject();
+		result.add("type", new JsonPrimitive(type));
+		if (nd.getLoc() != null)
+			result.add("loc", visit(nd.getLoc()));
+		return result;
+	}
+
+	private JsonObject visit(SourceLocation loc) {
+		JsonObject result = new JsonObject();
+		result.add("start", visit(loc.getStart()));
+		result.add("end", visit(loc.getEnd()));
+		return result;
+	}
+
+	private JsonObject visit(Position pos) {
+		JsonObject result = new JsonObject();
+		result.add("line", visitPrimitive(pos.getLine()));
+		result.add("column", visitPrimitive(pos.getColumn()));
+		result.add("offset", visitPrimitive(pos.getOffset()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ArrayExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("elements", visit(nd.getElements()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(AssignmentExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("operator", visitPrimitive(nd.getOperator()));
+		result.add("left", visit(nd.getLeft()));
+		result.add("right", visit(nd.getRight()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(AssignmentPattern nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("left", visit(nd.getLeft()));
+		result.add("right", visit(nd.getRight()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(BinaryExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("left", visit(nd.getLeft()));
+		result.add("operator", visitPrimitive(nd.getOperator()));
+		result.add("right", visit(nd.getRight()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(BlockStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(BreakStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("label", visit(nd.getLabel()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ContinueStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("label", visit(nd.getLabel()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(CallExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("callee", visit(nd.getCallee()));
+		result.add("arguments", visit(nd.getArguments()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(CatchClause nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("param", visit(nd.getParam()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ClassBody nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ClassDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		visit(nd.getClassDef(), result);
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ClassExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		visit(nd.getClassDef(), result);
+		return result;
+	}
+
+	private void visit(AClass classDef, JsonObject result) {
+		result.add("id", visit(classDef.getId()));
+		result.add("superClass", visit(classDef.getSuperClass()));
+		result.add("body", visit(classDef.getBody()));
+		if (!classDef.getDecorators().isEmpty())
+			result.add("decorators", visit(classDef.getDecorators()));
+	}
+
+	@Override
+	public JsonElement visit(ComprehensionBlock nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("left", visit(nd.getLeft()));
+		result.add("right", visit(nd.getRight()));
+		result.add("each", visitPrimitive(nd.isOf()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ComprehensionExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		result.add("blocks", visit(nd.getBlocks()));
+		result.add("filter", visit(nd.getFilter()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ConditionalExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("test", visit(nd.getTest()));
+		result.add("consequent", visit(nd.getConsequent()));
+		result.add("alternate", visit(nd.getAlternate()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(DoWhileStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		result.add("test", visit(nd.getTest()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(EmptyStatement nd, Void c) {
+		return this.mkNode(nd);
+	}
+
+	@Override
+	public JsonElement visit(ExportNamedDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("declaration", visit(nd.getDeclaration()));
+		result.add("specifiers", visit(nd.getSpecifiers()));
+		result.add("source", visit(nd.getSource()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExportSpecifier nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		if (nd.getLocal() != null)
+			result.add("local", visit(nd.getLocal()));
+		result.add("exported", visit(nd.getExported()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExpressionStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getExpression()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(EnhancedForStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("left", visit(nd.getLeft()));
+		result.add("right", visit(nd.getRight()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ForStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("init", visit(nd.getInit()));
+		result.add("test", visit(nd.getTest()));
+		result.add("update", visit(nd.getUpdate()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(IFunction nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("id", visit(nd.getId()));
+		result.add("generator", new JsonPrimitive(nd.isGenerator()));
+		result.add("expression", new JsonPrimitive(nd.getBody() instanceof Expression));
+		result.add("async", new JsonPrimitive(nd.isAsync()));
+		result.add("params", visit(nd.getRawParameters()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Identifier nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", new JsonPrimitive(nd.getName()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(IfStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("test", visit(nd.getTest()));
+		result.add("consequent", visit(nd.getConsequent()));
+		result.add("alternate", visit(nd.getAlternate()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ImportDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("specifiers", visit(nd.getSpecifiers()));
+		result.add("source", visit(nd.getSource()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ImportSpecifier nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("imported", visit(nd.getImported()));
+		result.add("local", visit(nd.getLocal()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ImportNamespaceSpecifier nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("local", visit(nd.getLocal()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(LabeledStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		result.add("label", visit(nd.getLabel()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Literal nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		if (nd.isRegExp())
+			result.add("value", new JsonObject());
+		else
+			result.add("value", visitPrimitive(nd.getValue()));
+		result.add("raw", new JsonPrimitive(nd.getRaw()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(LogicalExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("left", visit(nd.getLeft()));
+		result.add("operator", visitPrimitive(nd.getOperator()));
+		result.add("right", visit(nd.getRight()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(MemberExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("object", visit(nd.getObject()));
+		result.add("property", visit(nd.getProperty()));
+		result.add("computed", new JsonPrimitive(nd.isComputed()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(MemberDefinition<?> nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("computed", visitPrimitive(nd.isComputed()));
+		result.add("key", visit(nd.getKey()));
+		result.add("static", visitPrimitive(nd.isStatic()));
+		result.add("value", visit(nd.getValue()));
+		if (!nd.getDecorators().isEmpty())
+			result.add("decorators", visit(nd.getDecorators()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(MethodDefinition nd, Void c) {
+		JsonObject result = (JsonObject) super.visit(nd, c);
+		result.add("kind", visitPrimitive(StringUtil.lc(nd.getKind().toString())));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(NewExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("callee", visit(nd.getCallee()));
+		result.add("arguments", visit(nd.getArguments()));
+		return result;
+	}
+
+	@Override
+	public JsonObject visit(Node nd, Void c) {
+		throw new UnsupportedOperationException(nd.getType());
+	}
+
+	@Override
+	public JsonElement visit(ObjectExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("properties", visit(nd.getProperties()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ObjectPattern nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("properties", visit(nd.getRawProperties()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ParenthesizedExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getExpression()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Program nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		result.add("sourceType", visitPrimitive(nd.getSourceType()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Property nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("method", new JsonPrimitive(nd.isMethod()));
+		result.add("shorthand", new JsonPrimitive(nd.isShorthand()));
+		result.add("computed", new JsonPrimitive(nd.isComputed()));
+		result.add("key", visit(nd.getKey()));
+		result.add("kind", new JsonPrimitive(StringUtil.lc(nd.getKind().name())));
+		result.add("value", visit(nd.getRawValue()));
+		if (!nd.getDecorators().isEmpty())
+			result.add("decorators", visit(nd.getDecorators()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(RestElement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ReturnStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(SequenceExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expressions", visit(nd.getExpressions()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(SwitchCase nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("consequent", visit(nd.getConsequent()));
+		result.add("test", visit(nd.getTest()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(SwitchStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("discriminant", visit(nd.getDiscriminant()));
+		result.add("cases", visit(nd.getCases()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ThisExpression nd, Void c) {
+		return this.mkNode(nd);
+	}
+
+	@Override
+	public JsonElement visit(ThrowStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(TryStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("block", visit(nd.getBlock()));
+		result.add("handler", visit(nd.getHandler()));
+		result.add("finalizer", visit(nd.getFinalizer()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(UnaryExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("operator", visitPrimitive(nd.getOperator()));
+		result.add("prefix", new JsonPrimitive(nd.isPrefix()));
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(UpdateExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("operator", visitPrimitive(nd.getOperator()));
+		result.add("prefix", new JsonPrimitive(nd.isPrefix()));
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(VariableDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("declarations", visit(nd.getDeclarations()));
+		result.add("kind", new JsonPrimitive(nd.getKind()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(VariableDeclarator nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("id", visit(nd.getId()));
+		result.add("init", visit(nd.getInit()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(WhileStatement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("test", visit(nd.getTest()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ArrayPattern nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("elements", visit(nd.getRawElements()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(WithStatement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("object", visit(nd.getObject()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(SpreadElement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(YieldExpression nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		result.add("delegate", visitPrimitive(nd.isDelegating()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(DebuggerStatement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(TemplateElement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		JsonObject value = new JsonObject();
+		value.add("cooked", visitPrimitive(nd.getCooked()));
+		value.add("raw", visitPrimitive(nd.getRaw()));
+		result.add("value", value);
+		result.add("tail", visitPrimitive(nd.isTail()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(TemplateLiteral nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("quasis", visit(nd.getQuasis()));
+		result.add("expressions", visit(nd.getExpressions()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(TaggedTemplateExpression nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("tag", visit(nd.getTag()));
+		result.add("quasi", visit(nd.getQuasi()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(LetStatement nd, Void q) {
+		JsonObject result = this.mkNode(nd);
+		result.add("head", visit(nd.getHead()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(LetExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("head", visit(nd.getHead()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Super nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(MetaProperty nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("meta", visit(nd.getMeta()));
+		result.add("property", visit(nd.getProperty()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExportAllDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("source", visit(nd.getSource()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExportDefaultDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("declaration", visit(nd.getDeclaration()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXIdentifier nd, Void c) {
+		JsonObject result = this.mkNode(nd, "JSXIdentifier");
+		result.add("name", visitPrimitive(nd.getName()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXMemberExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("object", visit(nd.getObject()));
+		result.add("property", visit(nd.getName()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXNamespacedName nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("namespace", visit(nd.getNamespace()));
+		result.add("name", visit(nd.getName()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXEmptyExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXExpressionContainer nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getExpression()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXOpeningElement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", visit(nd.getName()));
+		result.add("attributes", visit(nd.getAttributes()));
+		result.add("selfClosing", visitPrimitive(nd.isSelfClosing()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXClosingElement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", visit(nd.getName()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXAttribute nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", visit(nd.getName()));
+		result.add("value", visit(nd.getValue()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXSpreadAttribute nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(JSXElement nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("openingElement", visit(nd.getOpeningElement()));
+		result.add("children", visit(nd.getChildren()));
+		result.add("closingElement", visit(nd.getClosingElement()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(AwaitExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("argument", visit(nd.getArgument()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(Decorator nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getExpression()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(BindExpression nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("object", visit(nd.getObject()));
+		result.add("callee", visit(nd.getCallee()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(NamespaceDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", visit(nd.getName()));
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ImportWholeDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("name", visit(nd.getLhs()));
+		result.add("moduleReference", visit(nd.getRhs()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExportWholeDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getRhs()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(ExternalModuleReference nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("expression", visit(nd.getExpression()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(DynamicImport nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("source", visit(nd.getSource()));
+		return result;
+	}
+
+	@Override
+	public JsonElement visit(InterfaceDeclaration nd, Void c) {
+		JsonObject result = this.mkNode(nd);
+		result.add("body", visit(nd.getBody()));
+		return result;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ArrayExpression.java b/javascript/extractor/src/com/semmle/js/ast/ArrayExpression.java
new file mode 100644
index 00000000000..735c7e1b52a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ArrayExpression.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * An array expression such as <code>[x, , "hello"]</code>.
+ */
+public class ArrayExpression extends Expression {
+	private final List<Expression> elements;
+
+	public ArrayExpression(SourceLocation loc, List<Expression> elements) {
+		super("ArrayExpression", loc);
+		this.elements = elements;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The elements of the array; omitted elements are represented by {@literal null}.
+	 */
+	public List<Expression> getElements() {
+		return elements;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ArrayPattern.java b/javascript/extractor/src/com/semmle/js/ast/ArrayPattern.java
new file mode 100644
index 00000000000..c7c466513f2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ArrayPattern.java
@@ -0,0 +1,78 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * An array pattern as in <code>var [x, y] = z;</code>.
+ */
+public class ArrayPattern extends Expression implements DestructuringPattern {
+	private final List<Expression> elements, rawElements;
+	private final List<Expression> defaults;
+	private final Expression restPattern;
+
+	public ArrayPattern(SourceLocation loc, List<Expression> elements) {
+		super("ArrayPattern", loc);
+		this.rawElements = elements;
+		this.elements = new ArrayList<Expression>(elements.size());
+		this.defaults = new ArrayList<Expression>(elements.size());
+		Expression rest = null;
+		for (Expression element : elements) {
+			if (element instanceof RestElement) {
+				rest = ((RestElement)element).getArgument();
+			} else {
+				if (element instanceof AssignmentPattern) {
+					AssignmentPattern assgn = (AssignmentPattern) element;
+					this.defaults.add(assgn.getRight());
+					this.elements.add(assgn.getLeft());
+				} else {
+					this.defaults.add(null);
+					this.elements.add(element);
+				}
+			}
+		}
+		this.restPattern = rest;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The element patterns of the array pattern; omitted element patterns are
+	 * represented by {@literal null}.
+	 */
+	public List<Expression> getElements() {
+		return elements;
+	}
+
+	/**
+	 * The default expressions for the element patterns of the array pattern.
+	 */
+	public List<Expression> getDefaults() {
+		return defaults;
+	}
+
+	/**
+	 * Return the rest pattern of this array pattern, if any.
+	 */
+	public Expression getRest() {
+		return restPattern;
+	}
+
+	/**
+	 * Does this array pattern have a rest pattern?
+	 */
+	public boolean hasRest() {
+		return restPattern != null;
+	}
+
+	/**
+	 * The raw element patterns of the array pattern; patterns with defaults
+	 * are represented as {@link AssignmentPattern}s.
+	 */
+	public List<Expression> getRawElements() {
+		return rawElements;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ArrowFunctionExpression.java b/javascript/extractor/src/com/semmle/js/ast/ArrowFunctionExpression.java
new file mode 100644
index 00000000000..99ef7905b90
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ArrowFunctionExpression.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * An arrow function expression such as <code>(x) =&gt; x*x</code>.
+ */
+public class ArrowFunctionExpression extends AFunctionExpression {
+	public ArrowFunctionExpression(SourceLocation loc,
+			List<Expression> params, Node body, Boolean generator, Boolean async) {
+		super("ArrowFunctionExpression", loc, null, params, body, generator, async, Collections.emptyList(), Collections.emptyList(),
+				Collections.emptyList(), null, null);
+	}
+
+	public ArrowFunctionExpression(SourceLocation loc,
+			List<Expression> params, Node body, Boolean generator, Boolean async,
+			List<TypeParameter> typeParameters, List<ITypeExpression> parameterTypes, ITypeExpression returnType) {
+		super("ArrowFunctionExpression", loc, null, params, body, generator, async, typeParameters, parameterTypes, Collections.emptyList(),
+				returnType, null);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AssignmentExpression.java b/javascript/extractor/src/com/semmle/js/ast/AssignmentExpression.java
new file mode 100644
index 00000000000..6871b904e3e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AssignmentExpression.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * An assignment expression such as <code>x = 23</code> or <code>y += 19</code>.
+ */
+public class AssignmentExpression extends ABinaryExpression {
+	public AssignmentExpression(SourceLocation loc, String operator, Expression left, Expression right) {
+		super(loc, "AssignmentExpression", operator, left, right);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AssignmentPattern.java b/javascript/extractor/src/com/semmle/js/ast/AssignmentPattern.java
new file mode 100644
index 00000000000..5e89a4344de
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AssignmentPattern.java
@@ -0,0 +1,21 @@
+package com.semmle.js.ast;
+
+
+/**
+ * An assignment pattern occurring in an lvalue position.
+ *
+ * Assignment patterns specify default values for function parameters, for-in/for-of loop variables and
+ * in destructuring assignments. We normalise them away during AST construction, attaching information
+ * about the default value directly to the parameter or variable in question. Hence, assignment patterns
+ * are not expected to appear in the AST the extractor works on.
+ */
+public class AssignmentPattern extends ABinaryExpression implements IPattern {
+	public AssignmentPattern(SourceLocation loc, String operator, Expression left, Expression right) {
+		super(loc, "AssignmentPattern", operator, left, right);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/AwaitExpression.java b/javascript/extractor/src/com/semmle/js/ast/AwaitExpression.java
new file mode 100644
index 00000000000..183a4dc81fe
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/AwaitExpression.java
@@ -0,0 +1,20 @@
+package com.semmle.js.ast;
+
+public class AwaitExpression extends Expression {
+	private Expression argument;
+
+	public AwaitExpression(SourceLocation loc, Expression argument) {
+		super("AwaitExpression", loc);
+		this.argument = argument;
+	}
+
+	public Expression getArgument() {
+		return argument;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/BinaryExpression.java b/javascript/extractor/src/com/semmle/js/ast/BinaryExpression.java
new file mode 100644
index 00000000000..e6250b8d6a6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/BinaryExpression.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A binary expression such as <code>x + y</code>.
+ */
+public class BinaryExpression extends ABinaryExpression {
+	public BinaryExpression(SourceLocation loc, String operator, Expression left, Expression right) {
+		super(loc, "BinaryExpression", operator, left, right);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/BindExpression.java b/javascript/extractor/src/com/semmle/js/ast/BindExpression.java
new file mode 100644
index 00000000000..cdd39082de0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/BindExpression.java
@@ -0,0 +1,28 @@
+package com.semmle.js.ast;
+
+public class BindExpression extends Expression {
+	private final Expression object, callee;
+
+	public BindExpression(SourceLocation loc, Expression object, Expression callee) {
+		super("BindExpression", loc);
+		this.object = object;
+		this.callee = callee;
+	}
+
+	public boolean hasObject() {
+		return object != null;
+	}
+
+	public Expression getObject() {
+		return object;
+	}
+
+	public Expression getCallee() {
+		return callee;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/BlockStatement.java b/javascript/extractor/src/com/semmle/js/ast/BlockStatement.java
new file mode 100644
index 00000000000..58434cb40b4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/BlockStatement.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A block statement such as <code>{ console.log("Hi"); }</code>.
+ */
+public class BlockStatement extends Statement {
+	private final List<Statement> body;
+
+	public BlockStatement(SourceLocation loc, List<Statement> body) {
+		super("BlockStatement", loc);
+		this.body = body;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The statements in the block.
+	 */
+	public List<Statement> getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/BreakStatement.java b/javascript/extractor/src/com/semmle/js/ast/BreakStatement.java
new file mode 100644
index 00000000000..eb6cf541a79
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/BreakStatement.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A break statement either with a label (<code>break outer;</code>) or without (<code>break;</code>).
+ */
+public class BreakStatement extends JumpStatement {
+	public BreakStatement(SourceLocation loc, Identifier label) {
+		super("BreakStatement", loc, label);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/CallExpression.java b/javascript/extractor/src/com/semmle/js/ast/CallExpression.java
new file mode 100644
index 00000000000..acb9dd1420a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/CallExpression.java
@@ -0,0 +1,19 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * A function call expression such as <code>f(1, 1)</code>.
+ */
+public class CallExpression extends InvokeExpression {
+	public CallExpression(SourceLocation loc, Expression callee, List<ITypeExpression> typeArguments, List<Expression> arguments) {
+		super("CallExpression", loc, callee, typeArguments, arguments);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/CatchClause.java b/javascript/extractor/src/com/semmle/js/ast/CatchClause.java
new file mode 100644
index 00000000000..ad6b10a7c80
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/CatchClause.java
@@ -0,0 +1,50 @@
+package com.semmle.js.ast;
+
+/**
+ * A catch clause with or without a guarding expression.
+ */
+public class CatchClause extends Statement {
+	private final IPattern param;
+	private final Expression guard;
+	private final BlockStatement body;
+
+	public CatchClause(SourceLocation loc, IPattern param, Expression guard, BlockStatement body) {
+		super("CatchClause", loc);
+		this.param = param;
+		this.guard = guard;
+		this.body = body;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The parameter of the catch clause.
+	 */
+	public IPattern getParam() {
+		return param;
+	}
+
+	/**
+	 * Does this catch clause have a guarding expression?
+	 */
+	public boolean hasGuard() {
+		return guard != null;
+	}
+
+	/**
+	 * The guarding expression of the catch clause; may be null.
+	 */
+	public Expression getGuard() {
+		return guard;
+	}
+
+	/**
+	 * The body of the catch clause.
+	 */
+	public BlockStatement getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ClassBody.java b/javascript/extractor/src/com/semmle/js/ast/ClassBody.java
new file mode 100644
index 00000000000..bcdb71d3c65
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ClassBody.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * The body of a {@linkplain ClassDeclaration} or {@linkplain ClassExpression}.
+ */
+public class ClassBody extends Node {
+	private final List<MemberDefinition<?>> body;
+
+	public ClassBody(SourceLocation loc, List<MemberDefinition<?>> body) {
+		super("ClassBody", loc);
+		this.body = body;
+	}
+
+	public List<MemberDefinition<?>> getBody() {
+		return body;
+	}
+
+	public void addMember(MemberDefinition<?> md) {
+		body.add(md);
+	}
+
+	public MethodDefinition getConstructor() {
+		for (MemberDefinition<?> md : body)
+			if (md.isConstructor())
+				return (MethodDefinition) md;
+		return null;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ClassDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ClassDeclaration.java
new file mode 100644
index 00000000000..ba67e293f88
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ClassDeclaration.java
@@ -0,0 +1,66 @@
+package com.semmle.js.ast;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A class declaration such as
+ *
+ * <pre>
+ * class ColouredPoint extends Point {
+ *   constructor(x, y, colour) {
+ *     super(x, y);
+ *     this.colour = colour;
+ *   }
+ * }
+ * </pre>
+ */
+public class ClassDeclaration extends Statement {
+	private final AClass klass;
+	private final boolean hasDeclareKeyword;
+	private final boolean hasAbstractKeyword;
+
+	public ClassDeclaration(SourceLocation loc, Identifier id, Expression superClass, ClassBody body) {
+		this(loc, id, Collections.emptyList(), superClass, Collections.emptyList(), body, false, false);
+	}
+
+	public ClassDeclaration(SourceLocation loc, Identifier id, List<TypeParameter> typeParameters, Expression superClass,
+			List<ITypeExpression> superInterfaces, ClassBody body, boolean hasDeclareKeyword, boolean hasAbstractKeyword) {
+		this(loc, new AClass(id, typeParameters, superClass, superInterfaces, body), hasDeclareKeyword, hasAbstractKeyword);
+	}
+
+	public ClassDeclaration(SourceLocation loc, AClass klass, boolean hasDeclareKeyword, boolean hasAbstractKeyword) {
+		super("ClassDeclaration", loc);
+		this.klass = klass;
+		this.hasDeclareKeyword = hasDeclareKeyword;
+		this.hasAbstractKeyword = hasAbstractKeyword;
+	}
+
+	public AClass getClassDef() {
+		return klass;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public void addDecorators(List<Decorator> decorators) {
+		klass.addDecorators(decorators);
+	}
+
+	public List<Decorator> getDecorators() {
+		return klass.getDecorators();
+	}
+
+	public boolean hasDeclareKeyword() {
+		return hasDeclareKeyword;
+	}
+
+	public boolean hasAbstractKeyword() {
+		return hasAbstractKeyword;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ClassExpression.java b/javascript/extractor/src/com/semmle/js/ast/ClassExpression.java
new file mode 100644
index 00000000000..c22ca8cac26
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ClassExpression.java
@@ -0,0 +1,54 @@
+package com.semmle.js.ast;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A class expression as in
+ *
+ * <pre>
+ * let ColouredPoint = class extends Point {
+ *   constructor(x, y, colour) {
+ *     super(x, y);
+ *     this.colour = colour;
+ *   }
+ * };
+ * </pre>
+ */
+public class ClassExpression extends Expression {
+	private final AClass klass;
+
+	public ClassExpression(SourceLocation loc, Identifier id, Expression superClass, ClassBody body) {
+		this(loc, id, Collections.emptyList(), superClass, Collections.emptyList(), body);
+	}
+
+	public ClassExpression(SourceLocation loc, Identifier id, List<TypeParameter> typeParameters, Expression superClass,
+			List<ITypeExpression> superInterfaces, ClassBody body) {
+		this(loc, new AClass(id, typeParameters, superClass, superInterfaces, body));
+	}
+
+	public ClassExpression(SourceLocation loc, AClass klass) {
+		super("ClassExpression", loc);
+		this.klass = klass;
+	}
+
+	public AClass getClassDef() {
+		return klass;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public void addDecorators(List<Decorator> decorators) {
+		klass.addDecorators(decorators);
+	}
+
+	public Iterable<Decorator> getDecorators() {
+		return klass.getDecorators();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Comment.java b/javascript/extractor/src/com/semmle/js/ast/Comment.java
new file mode 100644
index 00000000000..ef010fe9b24
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Comment.java
@@ -0,0 +1,78 @@
+package com.semmle.js.ast;
+
+import static com.semmle.js.ast.Comment.Kind.BLOCK;
+import static com.semmle.js.ast.Comment.Kind.HTML_END;
+import static com.semmle.js.ast.Comment.Kind.HTML_START;
+import static com.semmle.js.ast.Comment.Kind.LINE;
+
+/**
+ * A source code comment.
+ *
+ * This is not part of the SpiderMonkey AST format.
+ */
+public class Comment extends SourceElement {
+	/**
+	 * The kinds of comments recognized by the parser.
+	 */
+	public static enum Kind {
+		/**
+		 * A C++-style line comment starting with two slashes.
+		 */
+		LINE,
+
+		/**
+		 * A C-style block comment starting with slash-star and ending with star-slash.
+		 */
+		BLOCK,
+
+		/**
+		 * The start of an HTML comment (<code>&lt;!--</code>).
+		 */
+		HTML_START,
+
+		/**
+		 * The end of an HTML comment (<code>--&gt;</code>).
+		 */
+		HTML_END
+	};
+
+	private final String text;
+	private final Kind kind;
+
+	public Comment(SourceLocation loc, String text) {
+		super(loc);
+		this.text = text;
+		String raw = getLoc().getSource();
+		if (raw.startsWith("//"))
+			this.kind = LINE;
+		else if (raw.startsWith("/*"))
+			this.kind = BLOCK;
+		else if (raw.startsWith("<!--"))
+			this.kind = HTML_START;
+		else
+			this.kind = HTML_END;
+	}
+
+	/**
+	 * What kind of comment is this?
+	 */
+	public Kind getKind() {
+		return kind;
+	}
+
+	/**
+	 * Is this a JSDoc documentation comment?
+	 */
+	public boolean isDocComment() {
+		return kind == BLOCK && text.startsWith("*");
+	}
+
+	/**
+	 * The text of the comment, not including its delimiters.
+	 *
+	 * For documentation comments, the leading asterisk is included.
+	 */
+	public String getText() {
+		return text;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ComprehensionBlock.java b/javascript/extractor/src/com/semmle/js/ast/ComprehensionBlock.java
new file mode 100644
index 00000000000..4f55d87e707
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ComprehensionBlock.java
@@ -0,0 +1,43 @@
+package com.semmle.js.ast;
+
+/**
+ * A block in a comprehension expression.
+ */
+public class ComprehensionBlock extends Expression {
+	private final IPattern left;
+	private final Expression right;
+	private final boolean of;
+
+	public ComprehensionBlock(SourceLocation loc, IPattern left, Expression right, Boolean of) {
+		super("ComprehensionBlock", loc);
+		this.left = left;
+		this.right = right;
+		this.of = of != Boolean.FALSE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The iterator variable of this comprehension block.
+	 */
+	public IPattern getLeft() {
+		return left;
+	}
+
+	/**
+	 * The expression this comprehension block iterates over.
+	 */
+	public Expression getRight() {
+		return right;
+	}
+
+	/**
+	 * Is this a <code>for-of</code> comprehension block?
+	 */
+	public boolean isOf() {
+		return of;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ComprehensionExpression.java b/javascript/extractor/src/com/semmle/js/ast/ComprehensionExpression.java
new file mode 100644
index 00000000000..dbf0ccec6e9
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ComprehensionExpression.java
@@ -0,0 +1,61 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A comprehension expression.
+ */
+public class ComprehensionExpression extends Expression {
+	private final Expression body;
+	private final List<ComprehensionBlock> blocks;
+	private final Expression filter;
+	private final boolean generator;
+
+	public ComprehensionExpression(SourceLocation loc, Expression body, List<ComprehensionBlock> blocks, Expression filter, Boolean generator) {
+		super("ComprehensionExpression", loc);
+		this.body = body;
+		this.blocks = blocks;
+		this.filter = filter;
+		this.generator = generator == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The body expression of this comprehension.
+	 */
+	public Expression getBody() {
+		return body;
+	}
+
+	/**
+	 * The comprehension blocks of this comprehension.
+	 */
+	public List<ComprehensionBlock> getBlocks() {
+		return blocks;
+	}
+
+	/**
+	 * Does this comprehension expression have a filter expression?
+	 */
+	public boolean hasFilter() {
+		return filter != null;
+	}
+
+	/**
+	 * The filter expression of this comprehension; may be null.
+	 */
+	public Expression getFilter() {
+		return filter;
+	}
+
+	/**
+	 * Is this a generator expression?
+	 */
+	public boolean isGenerator() {
+		return generator;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ConditionalExpression.java b/javascript/extractor/src/com/semmle/js/ast/ConditionalExpression.java
new file mode 100644
index 00000000000..8ddd38cb3b4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ConditionalExpression.java
@@ -0,0 +1,42 @@
+package com.semmle.js.ast;
+
+/**
+ * A conditional expression such as <code>i &gt;= 0 ? a[i] : null</code>.
+ */
+public class ConditionalExpression extends Expression {
+	private final Expression test;
+	private final Expression consequent, alternate;
+
+	public ConditionalExpression(SourceLocation loc, Expression test, Expression consequent, Expression alternate) {
+		super("ConditionalExpression", loc);
+		this.test = test;
+		this.consequent = consequent;
+		this.alternate = alternate;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The test expression of this conditional expression.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	/**
+	 * The then-branch of this conditional expression.
+	 */
+	public Expression getConsequent() {
+		return consequent;
+	}
+
+	/**
+	 * The else-branch of this conditional expression.
+	 */
+	public Expression getAlternate() {
+		return alternate;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ContinueStatement.java b/javascript/extractor/src/com/semmle/js/ast/ContinueStatement.java
new file mode 100644
index 00000000000..a5e099b6e07
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ContinueStatement.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A continue statement either with a label (<code>continue outer;</code>) or without (<code>continue;</code>).
+ */
+public class ContinueStatement extends JumpStatement {
+	public ContinueStatement(SourceLocation loc, Identifier label) {
+		super("ContinueStatement", loc, label);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DebuggerStatement.java b/javascript/extractor/src/com/semmle/js/ast/DebuggerStatement.java
new file mode 100644
index 00000000000..c21890cbb89
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DebuggerStatement.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A debugger statement <code>debugger;</code>.
+ */
+public class DebuggerStatement extends Statement {
+	public DebuggerStatement(SourceLocation loc) {
+		super("DebuggerStatement", loc);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DeclarationFlags.java b/javascript/extractor/src/com/semmle/js/ast/DeclarationFlags.java
new file mode 100644
index 00000000000..e86b10d670c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DeclarationFlags.java
@@ -0,0 +1,128 @@
+package com.semmle.js.ast;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Defines bitmasks where each bit corresponds to a flag on
+ * {@linkplain MemberDefinition} or {@linkplain VariableDeclarator}.
+ */
+public class DeclarationFlags {
+	public static final int computed = 1 << 0;
+	public static final int abstract_ = 1 << 1;
+	public static final int static_ = 1 << 2;
+	public static final int readonly = 1 << 3;
+	public static final int public_ = 1 << 4;
+	public static final int private_ = 1 << 5;
+	public static final int protected_ = 1 << 6;
+	public static final int optional = 1 << 7;
+	public static final int definiteAssignmentAssertion = 1 << 8;
+
+	public static final int none = 0;
+	public static final int numberOfFlags = 9;
+
+	public static final List<String> names = Arrays.asList("computed", "abstract", "static", "readonly", "public", "private", "protected",
+			"optional", "definiteAssignmentAssertion");
+
+	public static final List<String> relationNames = Arrays.asList("isComputed", "isAbstractMember", "isStatic", "hasReadonlyKeyword",
+			"hasPublicKeyword", "hasPrivateKeyword", "hasProtectedKeyword", "isOptionalMember", "hasDefiniteAssignmentAssertion");
+
+	public static boolean isComputed(int flags) {
+		return (flags & computed) != 0;
+	}
+
+	public static boolean isAbstract(int flags) {
+		return (flags & abstract_) != 0;
+	}
+
+	public static boolean isStatic(int flags) {
+		return (flags & static_) != 0;
+	}
+
+	public static boolean isReadonly(int flags) {
+		return (flags & readonly) != 0;
+	}
+
+	public static boolean isPublic(int flags) {
+		return (flags & public_) != 0;
+	}
+
+	public static boolean isPrivate(int flags) {
+		return (flags & private_) != 0;
+	}
+
+	public static boolean isProtected(int flags) {
+		return (flags & protected_) != 0;
+	}
+
+	public static boolean isOptional(int flags) {
+		return (flags & optional) != 0;
+	}
+
+	public static boolean hasDefiniteAssignmentAssertion(int flags) {
+		return (flags & definiteAssignmentAssertion) != 0;
+	}
+
+	/** Returns a mask with the computed bit set to the value of <tt>enable</tt>. */
+	public static int getComputed(boolean enable) {
+		return enable ? computed : 0;
+	}
+
+	/** Returns a mask with the abstract bit set to the value of <tt>enable</tt>. */
+	public static int getAbstract(boolean enable) {
+		return enable ? abstract_ : 0;
+	}
+
+	/** Returns a mask with the static bit set to the value of <tt>enable</tt>. */
+	public static int getStatic(boolean enable) {
+		return enable ? static_ : 0;
+	}
+
+	/** Returns a mask with the public bit set to the value of <tt>enable</tt>. */
+	public static int getPublic(boolean enable) {
+		return enable ? public_ : 0;
+	}
+
+	/** Returns a mask with the readonly bit set to the value of <tt>enable</tt>. */
+	public static int getReadonly(boolean enable) {
+		return enable ? readonly : 0;
+	}
+
+	/** Returns a mask with the private bit set to the value of <tt>enable</tt>. */
+	public static int getPrivate(boolean enable) {
+		return enable ? private_ : 0;
+	}
+
+	/** Returns a mask with the protected bit set to the value of <tt>enable</tt>. */
+	public static int getProtected(boolean enable) {
+		return enable ? protected_ : 0;
+	}
+
+	/** Returns a mask with the optional bit set to the value of <tt>enable</tt>. */
+	public static int getOptional(boolean enable) {
+		return enable ? optional : 0;
+	}
+
+	/** Returns a mask with the definite assignment assertion bit set to the value of <tt>enable</tt>. */
+	public static int getDefiniteAssignmentAssertion(boolean enable) {
+		return enable ? definiteAssignmentAssertion : 0;
+	}
+
+	/** Returns true if the <tt>n</tt>th bit is set in <tt>flags</tt>. */
+	public static boolean hasNthFlag(int flags, int n) {
+		return (flags & (1 << n)) != 0;
+	}
+
+	public static String getFlagNames(int flags) {
+		StringBuilder b = new StringBuilder();
+		for (int i = 0; i < numberOfFlags; ++i) {
+			if (hasNthFlag(flags, i)) {
+				if (b.length() > 0) {
+					b.append(", ");
+				}
+				b.append(names.get(i));
+			}
+		}
+		return b.toString();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Decorator.java b/javascript/extractor/src/com/semmle/js/ast/Decorator.java
new file mode 100644
index 00000000000..15f44bb6afc
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Decorator.java
@@ -0,0 +1,19 @@
+package com.semmle.js.ast;
+
+public class Decorator extends Expression {
+	private final Expression expression;
+
+	public Decorator(SourceLocation loc, Expression expression) {
+		super("Decorator", loc);
+		this.expression = expression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public Expression getExpression() {
+		return expression;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DefaultVisitor.java b/javascript/extractor/src/com/semmle/js/ast/DefaultVisitor.java
new file mode 100644
index 00000000000..ead6ab52590
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DefaultVisitor.java
@@ -0,0 +1,737 @@
+package com.semmle.js.ast;
+
+import com.semmle.js.ast.jsx.IJSXAttribute;
+import com.semmle.js.ast.jsx.IJSXExpression;
+import com.semmle.js.ast.jsx.IJSXName;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXBoundaryElement;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportAsNamespaceDeclaration;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.GlobalAugmentationDeclaration;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.ts.ast.TypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+import com.semmle.util.exception.CatastrophicError;
+
+/**
+ * A convenience implementation of {@link Visitor} that provides default implementations
+ * of all visitor methods, and catch-all methods for treating similar classes of AST nodes.
+ */
+public class DefaultVisitor<C, R> implements Visitor<C, R> {
+	public R visit(Node nd, C c) {
+		return null;
+	}
+
+	public R visit(Expression nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	public R visit(Statement nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	/** Default visitor for type expressions that are not also expressions. */
+	public R visit(TypeExpression nd, C c) {
+		return visit((Node) nd, c);
+	}
+
+	public R visit(EnhancedForStatement nd, C c) {
+		return visit((Loop)nd, c);
+	}
+
+	public R visit(InvokeExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	public R visit(Loop nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	public R visit(IFunction nd, C c) {
+		if (nd instanceof Statement)
+			return visit((Statement)nd, c);
+		else
+			return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(AssignmentExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(AssignmentPattern nd, C q) {
+		throw new CatastrophicError("Assignment patterns should not appear in the AST.");
+	}
+
+	@Override
+	public R visit(BinaryExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(BlockStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(CallExpression nd, C c) {
+		return visit((InvokeExpression)nd, c);
+	}
+
+	@Override
+	public R visit(ComprehensionBlock nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ComprehensionExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ExpressionStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(FunctionDeclaration nd, C c) {
+		return visit((IFunction)nd, c);
+	}
+
+	@Override
+	public R visit(Identifier nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(Literal nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(LogicalExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(MemberExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(Program nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	@Override
+	public R visit(RestElement nd, C q) {
+		throw new CatastrophicError("Rest elements should not appear in the AST.");
+	}
+
+	@Override
+	public R visit(UnaryExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(UpdateExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(VariableDeclaration nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(VariableDeclarator nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(SwitchStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(SwitchCase nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ForStatement nd, C c) {
+		return visit((Loop)nd, c);
+	}
+
+	@Override
+	public R visit(ForInStatement nd, C c) {
+		return visit((EnhancedForStatement)nd, c);
+	}
+
+	@Override
+	public R visit(ForOfStatement nd, C c) {
+		return visit((EnhancedForStatement)nd, c);
+	}
+
+	@Override
+	public R visit(Property nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	@Override
+	public R visit(ArrayPattern nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(IfStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(LabeledStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ObjectPattern nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(WithStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(DoWhileStatement nd, C c) {
+		return visit((Loop)nd, c);
+	}
+
+	@Override
+	public R visit(WhileStatement nd, C c) {
+		return visit((Loop)nd, c);
+	}
+
+	@Override
+	public R visit(CatchClause nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(TryStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(NewExpression nd, C c) {
+		return visit((InvokeExpression)nd, c);
+	}
+
+	@Override
+	public R visit(ReturnStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ThrowStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(SpreadElement nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(YieldExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ParenthesizedExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(EmptyStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	public R visit(JumpStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(BreakStatement nd, C c) {
+		return visit((JumpStatement)nd, c);
+	}
+
+	@Override
+	public R visit(ContinueStatement nd, C c) {
+		return visit((JumpStatement)nd, c);
+	}
+
+	public R visit(AFunctionExpression nd, C c) {
+		return visit((IFunction)nd, c);
+	}
+
+	@Override
+	public R visit(FunctionExpression nd, C c) {
+		return visit((AFunctionExpression)nd, c);
+	}
+
+	@Override
+	public R visit(ArrowFunctionExpression nd, C c) {
+		return visit((AFunctionExpression)nd, c);
+	}
+
+	@Override
+	public R visit(DebuggerStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ArrayExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ObjectExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ThisExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ConditionalExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(SequenceExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(TemplateElement nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(TemplateLiteral nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(TaggedTemplateExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(LetStatement nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(LetExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ClassDeclaration nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ClassExpression nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ClassBody nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	public R visit(MemberDefinition<?> nd, C c) {
+		return visit((Node)nd, c);
+	}
+
+	@Override
+	public R visit(MethodDefinition nd, C c) {
+		return visit((MemberDefinition<FunctionExpression>) nd, c);
+	}
+
+	@Override
+	public R visit(FieldDefinition nd, C c) {
+		return visit((MemberDefinition<Expression>) nd, c);
+	}
+
+	@Override
+	public R visit(Super nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(MetaProperty nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	public R visit(ExportDeclaration nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ExportAllDeclaration nd, C c) {
+		return visit((ExportDeclaration)nd, c);
+	}
+
+	@Override
+	public R visit(ExportDefaultDeclaration nd, C c) {
+		return visit((ExportDeclaration)nd, c);
+	}
+
+	@Override
+	public R visit(ExportNamedDeclaration nd, C c) {
+		return visit((ExportDeclaration)nd, c);
+	}
+
+	@Override
+	public R visit(ExportSpecifier nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	@Override
+	public R visit(ExportDefaultSpecifier nd, C c) {
+		return visit((ExportSpecifier)nd, c);
+	}
+
+	@Override
+	public R visit(ExportNamespaceSpecifier nd, C c) {
+		return visit((ExportSpecifier)nd, c);
+	}
+
+	@Override
+	public R visit(ImportDeclaration nd, C c) {
+		return visit((Statement)nd, c);
+	}
+
+	@Override
+	public R visit(ImportDefaultSpecifier nd, C c) {
+		return visit((ImportSpecifier)nd, c);
+	}
+
+	@Override
+	public R visit(ImportNamespaceSpecifier nd, C c) {
+		return visit((ImportSpecifier)nd, c);
+	}
+
+	@Override
+	public R visit(ImportSpecifier nd, C c) {
+		return visit((Expression)nd, c);
+	}
+
+	public R visit(IJSXAttribute nd, C c) {
+		return visit((Node) nd, c);
+	}
+
+	@Override
+	public R visit(JSXAttribute nd, C c) {
+		return visit((IJSXAttribute) nd, c);
+	}
+
+	@Override
+	public R visit(JSXSpreadAttribute nd, C c) {
+		return visit((IJSXAttribute) nd, c);
+	}
+
+	public R visit(IJSXName nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(JSXIdentifier nd, C c) {
+		return visit((IJSXName) nd, c);
+	}
+
+	@Override
+	public R visit(JSXMemberExpression nd, C c) {
+		return visit((IJSXName) nd, c);
+	}
+
+	@Override
+	public R visit(JSXNamespacedName nd, C c) {
+		return visit((IJSXName) nd, c);
+	}
+
+	public R visit(IJSXExpression nd, C c) {
+		return visit((Node) nd, c);
+	}
+
+	@Override
+	public R visit(JSXEmptyExpression nd, C c) {
+		return visit((IJSXExpression) nd, c);
+	}
+
+	@Override
+	public R visit(JSXExpressionContainer nd, C c) {
+		return visit((IJSXExpression) nd, c);
+	}
+
+	public R visit(JSXBoundaryElement nd, C c) {
+		return visit((Node) nd, c);
+	}
+
+	@Override
+	public R visit(JSXOpeningElement nd, C c) {
+		return visit((JSXBoundaryElement) nd, c);
+	}
+
+	@Override
+	public R visit(JSXClosingElement nd, C c) {
+		return visit((JSXBoundaryElement) nd, c);
+	}
+
+	@Override
+	public R visit(JSXElement nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(AwaitExpression nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(Decorator nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(BindExpression nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(NamespaceDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(ImportWholeDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(ExportWholeDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(ExternalModuleReference nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(DynamicImport nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(InterfaceDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(KeywordTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(ArrayTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(UnionTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(IndexedAccessTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(IntersectionTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(ParenthesizedTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(TupleTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(KeyofTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(GenericTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(TypeofTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(IsTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(InterfaceTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(ExpressionWithTypeArguments nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(TypeParameter nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(FunctionTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(TypeAssertion nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(MappedTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(TypeAliasDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(EnumDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(EnumMember nd, C c) {
+		return visit((Node) nd, c);
+	}
+
+	@Override
+	public R visit(DecoratorList nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(ExternalModuleDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(ExportAsNamespaceDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(GlobalAugmentationDeclaration nd, C c) {
+		return visit((Statement) nd, c);
+	}
+
+	@Override
+	public R visit(NonNullAssertion nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(ConditionalTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(InferTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(ImportTypeExpr nd, C c) {
+		return visit((Expression) nd, c);
+	}
+
+	@Override
+	public R visit(OptionalTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+
+	@Override
+	public R visit(RestTypeExpr nd, C c) {
+		return visit((TypeExpression) nd, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DestructuringPattern.java b/javascript/extractor/src/com/semmle/js/ast/DestructuringPattern.java
new file mode 100644
index 00000000000..471d231ba83
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DestructuringPattern.java
@@ -0,0 +1,7 @@
+package com.semmle.js.ast;
+
+/**
+ * An array or object pattern.
+ */
+public interface DestructuringPattern extends IPattern {
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DoWhileStatement.java b/javascript/extractor/src/com/semmle/js/ast/DoWhileStatement.java
new file mode 100644
index 00000000000..0373b032376
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DoWhileStatement.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+/**
+ * A do-while statement of the form <code>do { ... } while(...);</code>.
+ */
+public class DoWhileStatement extends Loop {
+	private final Expression test;
+
+	public DoWhileStatement(SourceLocation loc, Expression test, Statement body) {
+		super("DoWhileStatement", loc, body);
+		this.test = test;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The test expression of this loop.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	@Override
+	public Node getContinueTarget() {
+		return test;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/DynamicImport.java b/javascript/extractor/src/com/semmle/js/ast/DynamicImport.java
new file mode 100644
index 00000000000..cf87ad8df03
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/DynamicImport.java
@@ -0,0 +1,19 @@
+package com.semmle.js.ast;
+
+public class DynamicImport extends Expression {
+	private final Expression source;
+
+	public DynamicImport(SourceLocation loc, Expression source) {
+		super("DynamicImport", loc);
+		this.source = source;
+	}
+
+	public Expression getSource() {
+		return source;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/EmptyStatement.java b/javascript/extractor/src/com/semmle/js/ast/EmptyStatement.java
new file mode 100644
index 00000000000..c0048326687
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/EmptyStatement.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * An empty statement <code>;</code>.
+ */
+public class EmptyStatement extends Statement {
+	public EmptyStatement(SourceLocation loc) {
+		super("EmptyStatement", loc);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/EnhancedForStatement.java b/javascript/extractor/src/com/semmle/js/ast/EnhancedForStatement.java
new file mode 100644
index 00000000000..62f21940739
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/EnhancedForStatement.java
@@ -0,0 +1,58 @@
+package com.semmle.js.ast;
+
+/**
+ * An enhanced for statement, that is, either a {@link ForInStatement} or a {@link ForOfStatement}.
+ */
+public abstract class EnhancedForStatement extends Loop {
+	private final Node left;
+	private final Expression defaultValue;
+	private final Expression right;
+
+	public EnhancedForStatement(String type, SourceLocation loc, Node left,
+			Expression right, Statement body) {
+		super(type, loc, body);
+		if (left instanceof AssignmentPattern) {
+			AssignmentPattern ap = (AssignmentPattern) left;
+			this.left = ap.getLeft();
+			this.defaultValue = ap.getRight();
+		} else {
+			this.left = left;
+			this.defaultValue = null;
+		}
+		this.right = right;
+	}
+
+	/**
+	 * The iterator variable of this statement; may be either a {@link VariableDeclaration} statement,
+	 * or an lvalue {@link Expression}. 
+	 */
+	public Node getLeft() {
+		return left;
+	}
+
+	/**
+	 * Does the iterator variable of this statement have a default value?
+	 */
+	public boolean hasDefaultValue() {
+		return defaultValue != null;
+	}
+
+	/**
+	 * Get the default value of the iterator variable of this statement.
+	 */
+	public Expression getDefaultValue() {
+		return defaultValue;
+	}
+
+	/**
+	 * The expression this loop iterates over.
+	 */
+	public Expression getRight() {
+		return right;
+	}
+
+	@Override
+	public Node getContinueTarget() {
+		return this;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportAllDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ExportAllDeclaration.java
new file mode 100644
index 00000000000..e3f67494f4b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportAllDeclaration.java
@@ -0,0 +1,26 @@
+package com.semmle.js.ast;
+
+/**
+ * A re-export declaration of the form
+ *
+ * <pre>
+ *   export * from 'foo';
+ * </pre>
+ */
+public class ExportAllDeclaration extends ExportDeclaration {
+	private final Literal source;
+
+	public ExportAllDeclaration(SourceLocation loc, Literal source) {
+		super("ExportAllDeclaration", loc);
+		this.source = source;
+	}
+
+	public Literal getSource() {
+		return source;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ExportDeclaration.java
new file mode 100644
index 00000000000..484fa0c1fc5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportDeclaration.java
@@ -0,0 +1,9 @@
+package com.semmle.js.ast;
+
+public abstract class ExportDeclaration extends Statement {
+
+	public ExportDeclaration(String type, SourceLocation loc) {
+		super(type, loc);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportDefaultDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ExportDefaultDeclaration.java
new file mode 100644
index 00000000000..b5b306c1269
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportDefaultDeclaration.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast;
+
+/**
+ * A default export declaration of the form
+ *
+ * <pre>
+ *   export default function f() { return 23; };
+ * </pre>
+ *
+ * or
+ *
+ * <pre>
+ *   export default 42;
+ * </pre>
+ */
+public class ExportDefaultDeclaration extends ExportDeclaration {
+	/**
+	 * Either an {@linkplain Expression} or a {@linkplain FunctionDeclaration} or
+	 * a {@linkplain ClassDeclaration}.
+	 */
+	private final Node declaration;
+
+	public ExportDefaultDeclaration(SourceLocation loc, Node declaration) {
+		super("ExportDefaultDeclaration", loc);
+		this.declaration = declaration;
+	}
+
+	public Node getDeclaration() {
+		return declaration;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportDefaultSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ExportDefaultSpecifier.java
new file mode 100644
index 00000000000..fe703f960f1
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportDefaultSpecifier.java
@@ -0,0 +1,16 @@
+package com.semmle.js.ast;
+
+/**
+ * A default export specifier, such as <code>f</code> in
+ * <code>export f from 'foo';</code>.
+ */
+public class ExportDefaultSpecifier extends ExportSpecifier {
+	public ExportDefaultSpecifier(SourceLocation loc, Identifier exported) {
+		super("ExportDefaultSpecifier", loc, null, exported);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportNamedDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ExportNamedDeclaration.java
new file mode 100644
index 00000000000..4f55c79e3fc
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportNamedDeclaration.java
@@ -0,0 +1,50 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A named export declaration, which can be of one of the following forms:
+ *
+ * <ul>
+ * <li><code>export var x = 23;</code></li>
+ * <li><code>export { x, y } from 'foo';</code></li>
+ * <li><code>export { x, y };</code></li>
+ * </ul>
+ */
+public class ExportNamedDeclaration extends ExportDeclaration {
+	private final Statement declaration;
+	private final List<ExportSpecifier> specifiers;
+	private final Literal source;
+
+	public ExportNamedDeclaration(SourceLocation loc, Statement declaration, List<ExportSpecifier> specifiers, Literal source) {
+		super("ExportNamedDeclaration", loc);
+		this.declaration = declaration;
+		this.specifiers = specifiers;
+		this.source = source;
+	}
+
+	public Statement getDeclaration() {
+		return declaration;
+	}
+
+	public boolean hasDeclaration() {
+		return declaration != null;
+	}
+
+	public List<ExportSpecifier> getSpecifiers() {
+		return specifiers;
+	}
+
+	public Literal getSource() {
+		return source;
+	}
+
+	public boolean hasSource() {
+		return source != null;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportNamespaceSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ExportNamespaceSpecifier.java
new file mode 100644
index 00000000000..7bfc380ebee
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportNamespaceSpecifier.java
@@ -0,0 +1,16 @@
+package com.semmle.js.ast;
+
+/**
+ * A namespace export specifier such as <code>* as foo</code> in
+ * <code>export * as foo from 'foo';</code>.
+ */
+public class ExportNamespaceSpecifier extends ExportSpecifier {
+	public ExportNamespaceSpecifier(SourceLocation loc, Identifier exported) {
+		super("ExportNamespaceSpecifier", loc, null, exported);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExportSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ExportSpecifier.java
new file mode 100644
index 00000000000..009520e91d3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExportSpecifier.java
@@ -0,0 +1,32 @@
+package com.semmle.js.ast;
+
+/**
+ * An export specifier in an {@linkplain ExportNamedDeclaration}; may either be a plain
+ * identifier <code>x</code>, or a rename export <code>x as y</code>.
+ */
+public class ExportSpecifier extends Expression {
+	private final Identifier local, exported;
+
+	public ExportSpecifier(SourceLocation loc, Identifier local, Identifier exported) {
+		this("ExportSpecifier", loc, local, exported);
+	}
+
+	public ExportSpecifier(String type, SourceLocation loc, Identifier local, Identifier exported) {
+		super(type, loc);
+		this.local = local;
+		this.exported = exported == local ? new NodeCopier().copy(exported) : exported;
+	}
+
+	public Identifier getLocal() {
+		return local;
+	}
+
+	public Identifier getExported() {
+		return exported;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Expression.java b/javascript/extractor/src/com/semmle/js/ast/Expression.java
new file mode 100644
index 00000000000..ff70dd20eaa
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Expression.java
@@ -0,0 +1,31 @@
+package com.semmle.js.ast;
+
+import com.semmle.ts.ast.ITypedAstNode;
+
+/**
+ * Common superclass of all expressions.
+ */
+public abstract class Expression extends Node implements ITypedAstNode {
+	private int staticTypeId = -1;
+
+	public Expression(String type, SourceLocation loc) {
+		super(type, loc);
+	}
+
+	/**
+	 * This expression, but with any surrounding parentheses stripped off.
+	 */
+	public Expression stripParens() {
+		return this;
+	}
+
+	@Override
+	public int getStaticTypeId() {
+		return staticTypeId;
+	}
+
+	@Override
+	public void setStaticTypeId(int staticTypeId) {
+		this.staticTypeId = staticTypeId;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ExpressionStatement.java b/javascript/extractor/src/com/semmle/js/ast/ExpressionStatement.java
new file mode 100644
index 00000000000..35132f02d3d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ExpressionStatement.java
@@ -0,0 +1,25 @@
+package com.semmle.js.ast;
+
+/**
+ * An expression statement such as <code>alert("Hi!");</code>.
+ */
+public class ExpressionStatement extends Statement {
+	private final Expression expression;
+
+	public ExpressionStatement(SourceLocation loc, Expression expression) {
+		super("ExpressionStatement", loc);
+		this.expression = expression;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expression wrapped by this expression statement.
+	 */
+	public Expression getExpression() {
+		return expression;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/FieldDefinition.java b/javascript/extractor/src/com/semmle/js/ast/FieldDefinition.java
new file mode 100644
index 00000000000..33e9452478e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/FieldDefinition.java
@@ -0,0 +1,53 @@
+package com.semmle.js.ast;
+
+import com.semmle.ts.ast.ITypeExpression;
+
+public class FieldDefinition extends MemberDefinition<Expression> {
+	private final ITypeExpression typeAnnotation;
+	private final int fieldParameterIndex;
+
+	private static final int notFieldParameter = -1;
+
+	public FieldDefinition(SourceLocation loc, int flags, Expression key, Expression value) {
+		this(loc, flags, key, value, null);
+	}
+
+	public FieldDefinition(SourceLocation loc, int flags,
+			Expression key, Expression value, ITypeExpression typeAnnotation) {
+		this(loc, flags, key, value, typeAnnotation, notFieldParameter);
+	}
+
+	public FieldDefinition(SourceLocation loc, int flags, Expression key, Expression value, ITypeExpression typeAnnotation,
+			int fieldParameterIndex) {
+		super("FieldDefinition", loc, flags, key, value);
+		this.typeAnnotation = typeAnnotation;
+		this.fieldParameterIndex = fieldParameterIndex;
+	}
+
+	public ITypeExpression getTypeAnnotation() {
+		return typeAnnotation;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public boolean isConcrete() {
+		return !isAbstract();
+	}
+
+	@Override
+	public boolean isParameterField() {
+		return fieldParameterIndex != notFieldParameter;
+	}
+
+	/**
+	 * If this is a field parameter, returns the index of the parameter that
+	 * generated it, or -1 if this is not a field parameter.
+	 */
+	public int getFieldParameterIndex() {
+		return fieldParameterIndex;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ForInStatement.java b/javascript/extractor/src/com/semmle/js/ast/ForInStatement.java
new file mode 100644
index 00000000000..5978216129b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ForInStatement.java
@@ -0,0 +1,29 @@
+package com.semmle.js.ast;
+
+/**
+ * A for-in statement such as
+ *
+ * <pre>
+ * for (var p in src)
+ *   dest[p] = src[p];
+ * </pre>
+ *
+ * This also includes legacy for-each statements.
+ */
+public class ForInStatement extends EnhancedForStatement {
+	private final boolean each;
+
+	public ForInStatement(SourceLocation loc, Node left, Expression right, Statement body, Boolean each) {
+		super("ForInStatement", loc, left, right, body);
+		this.each = each == Boolean.TRUE;
+	}
+
+	public boolean isEach() {
+		return each;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ForOfStatement.java b/javascript/extractor/src/com/semmle/js/ast/ForOfStatement.java
new file mode 100644
index 00000000000..f67a07ddc43
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ForOfStatement.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+/**
+ * A for-of statement such as
+ *
+ * <pre>
+ * for (var elt of array)
+ *   sum += elt;
+ * </pre>
+ */
+public class ForOfStatement extends EnhancedForStatement {
+	private boolean isAwait;
+
+	public ForOfStatement(SourceLocation loc, Node left, Expression right, Statement body) {
+		super("ForOfStatement", loc, left, right, body);
+	}
+
+	public void setAwait(boolean isAwait) {
+		this.isAwait = isAwait;
+	}
+
+	public boolean isAwait() {
+		return isAwait;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ForStatement.java b/javascript/extractor/src/com/semmle/js/ast/ForStatement.java
new file mode 100644
index 00000000000..5276bf95aa1
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ForStatement.java
@@ -0,0 +1,79 @@
+package com.semmle.js.ast;
+
+/**
+ * A for statement such as
+ *
+ * <pre>
+ * for (var i=10; i&gt;0; i--)
+ *   console.log(i);
+ * console.log("Boom!");
+ * </pre>
+ */
+public class ForStatement extends Loop {
+	private final Node init;
+	private final Expression test, update;
+
+	public ForStatement(SourceLocation loc, Node init, Expression test, Expression update, Statement body) {
+		super("ForStatement", loc, body);
+		this.init = init;
+		this.test = test;
+		this.update = update;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * Does this for statement have an initialization part?
+	 */
+	public boolean hasInit() {
+		return init != null;
+	}
+
+	/**
+	 * The initialization part of this for statement; may be a {@link VariableDeclaration}
+	 * statement, an {@link Expression}, or {@literal null}.
+	 */
+	public Node getInit() {
+		return init;
+	}
+
+	/**
+	 * Does this for statement have a test?
+	 */
+	public boolean hasTest() {
+		return test != null;
+	}
+
+	/**
+	 * The test expression of this for statement; may be null.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	/**
+	 * Does this for statement have an update expression?
+	 */
+	public boolean hasUpdate() {
+		return update != null;
+	}
+
+	/**
+	 * The update expression of this for statement; may be null.
+	 */
+	public Expression getUpdate() {
+		return update;
+	}
+
+	@Override
+	public Node getContinueTarget() {
+		if (update != null)
+			return update;
+		if (test != null)
+			return test;
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/FunctionDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/FunctionDeclaration.java
new file mode 100644
index 00000000000..4971aa671dc
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/FunctionDeclaration.java
@@ -0,0 +1,87 @@
+package com.semmle.js.ast;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A function declaration such as
+ *
+ * <pre>
+ * function add(x, y) {
+ *   return x+y;
+ * }
+ * </pre>
+ */
+public class FunctionDeclaration extends Statement implements IFunction {
+	private final AFunction<BlockStatement> fn;
+	private final boolean hasDeclareKeyword;
+	private int symbol = -1;
+
+	public FunctionDeclaration(SourceLocation loc, Identifier id, List<Expression> params, BlockStatement body, boolean generator,
+			boolean async) {
+		this(loc, new AFunction<BlockStatement>(id, params, body, generator, async, Collections.emptyList(), Collections.emptyList(),
+				Collections.emptyList(), null, null),
+				false);
+	}
+
+	public FunctionDeclaration(SourceLocation loc, Identifier id,
+			List<Expression> params, BlockStatement body, boolean generator, boolean async, boolean hasDeclareKeyword,
+			List<TypeParameter> typeParameters, List<ITypeExpression> parameterTypes, ITypeExpression returnType,
+			ITypeExpression thisParameterType) {
+		this(loc, new AFunction<BlockStatement>(id, params, body, generator, async, typeParameters, parameterTypes, Collections.emptyList(),
+				returnType, thisParameterType), hasDeclareKeyword);
+	}
+
+	private FunctionDeclaration(SourceLocation loc, AFunction<BlockStatement> fn, boolean hasDeclareKeyword) {
+		super("FunctionDeclaration", loc);
+		this.fn = fn;
+		this.hasDeclareKeyword = hasDeclareKeyword;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	public FunctionExpression asFunctionExpression() {
+		return new FunctionExpression(getLoc(), fn);
+	}
+
+	@Override public Identifier getId()            { return fn.getId();        }
+	@Override public List<IPattern> getParams()    { return fn.getParams();    }
+	@Override public boolean hasDefault(int i)     { return fn.hasDefault(i);  }
+	@Override public Expression getDefault(int i)  { return fn.getDefault(i);  }
+	@Override public IPattern getRest()            { return fn.getRest();      }
+	@Override public BlockStatement getBody()      { return fn.getBody();      }
+	@Override public boolean hasRest()             { return fn.hasRest();      }
+	public boolean hasId()                         { return fn.hasId();        }
+	public boolean isGenerator()                   { return fn.isGenerator();  }
+	public boolean isAsync()                       { return fn.isAsync();      }
+	public List<IPattern> getAllParams()           { return fn.getAllParams(); }
+	@Override public List<Expression> getRawParameters() { return fn.getRawParams(); }
+	public ITypeExpression getReturnType()         { return fn.getReturnType(); }
+	@Override public boolean hasParameterType(int i) { return fn.hasParameterType(i); }
+	@Override public ITypeExpression getParameterType(int i) { return fn.getParameterType(i); }
+	public List<ITypeExpression> getParameterTypes() { return fn.getParameterTypes(); }
+	public List<TypeParameter> getTypeParameters() { return fn.getTypeParameters(); }
+	public ITypeExpression getThisParameterType() { return fn.getThisParameterType(); }
+	public List<DecoratorList> getParameterDecorators() { return fn.getParameterDecorators(); }
+
+	public boolean hasDeclareKeyword() {
+		return hasDeclareKeyword;
+	}
+
+	@Override
+	public int getSymbol() {
+		return this.symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/FunctionExpression.java b/javascript/extractor/src/com/semmle/js/ast/FunctionExpression.java
new file mode 100644
index 00000000000..b73f4bb6c8c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/FunctionExpression.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast;
+
+import java.util.Collections;
+import java.util.List;
+
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A plain function expression.
+ */
+public class FunctionExpression extends AFunctionExpression {
+	public FunctionExpression(SourceLocation loc, Identifier id,
+			List<Expression> params, Node body, Boolean generator, Boolean async) {
+		super("FunctionExpression", loc, id, params, body, generator, async, Collections.emptyList(), Collections.emptyList(),
+				Collections.emptyList(), null, null);
+	}
+
+	public FunctionExpression(SourceLocation loc, Identifier id,
+			List<Expression> params, Node body, Boolean generator, Boolean async,
+			List<TypeParameter> typeParameters, List<ITypeExpression> parameterTypes, List<DecoratorList> parameterDecorators,
+			ITypeExpression returnType, ITypeExpression thisParameterType) {
+		super("FunctionExpression", loc, id, params, body, generator, async, typeParameters, parameterTypes, parameterDecorators,
+				returnType, thisParameterType);
+	}
+
+	public FunctionExpression(SourceLocation loc, AFunction<? extends Node> fn) {
+		super("FunctionExpression", loc, fn);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/IFunction.java b/javascript/extractor/src/com/semmle/js/ast/IFunction.java
new file mode 100644
index 00000000000..f39cfe9c0fe
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/IFunction.java
@@ -0,0 +1,94 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+
+/**
+ * A function declaration or expression.
+ */
+public interface IFunction extends IStatementContainer, INodeWithSymbol {
+	/**
+	 * The function name; may be null for function expressions.
+	 */
+	public Identifier getId();
+
+	/**
+	 * The parameters of the function, not including the rest parameter.
+	 */
+	public List<IPattern> getParams();
+
+	/**
+	 * The parameters of the function, including the rest parameter.
+	 */
+	public List<IPattern> getAllParams();
+
+	/**
+	 * Does the i'th parameter have a default expression?
+	 */
+	public boolean hasDefault(int i);
+
+	/**
+	 * The default expression for the i'th parameter; may be null.
+	 */
+	public Expression getDefault(int i);
+
+	/**
+	 * The rest parameter of this function; may be null.
+	 */
+	public IPattern getRest();
+
+	/**
+	 * The body of the function; usually a {@link BlockStatement}, but may
+	 * be an {@link Expression} for function expressions.
+	 */
+	public Node getBody();
+
+	/**
+	 * Does this function have a rest parameter?
+	 */
+	public boolean hasRest();
+
+	/**
+	 * Is this function a generator function?
+	 */
+	public boolean isGenerator();
+
+	/**
+	 * The raw parameters of this function; parameters with defaults are
+	 * represented as {@link AssignmentPattern}s and the rest parameter
+	 * (if any) as a {@link RestElement}.
+	 */
+	public List<Expression> getRawParameters();
+
+	/**
+	 * Is this function an asynchronous function?
+	 */
+	public boolean isAsync();
+
+	/**
+	 * The return type of the function, if any.
+	 */
+	public ITypeExpression getReturnType();
+
+	/**
+	 * Does the i'th parameter have a type annotation?
+	 */
+	public boolean hasParameterType(int i);
+
+	/**
+	 * The type annotation for the i'th parameter; may be null.
+	 */
+	public ITypeExpression getParameterType(int i);
+
+	public List<TypeParameter> getTypeParameters();
+
+	public ITypeExpression getThisParameterType();
+
+	public List<DecoratorList> getParameterDecorators();
+
+	public boolean hasDeclareKeyword();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/INode.java b/javascript/extractor/src/com/semmle/js/ast/INode.java
new file mode 100644
index 00000000000..3b90cdcd8af
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/INode.java
@@ -0,0 +1,16 @@
+package com.semmle.js.ast;
+
+/**
+ * The common interface implemented by all AST node types.
+ */
+public interface INode extends ISourceElement {
+	/**
+	 * Accept a visitor object.
+	 */
+	public <C, R> R accept(Visitor<C, R> v, C c);
+
+	/**
+	 * Return the node's type tag.
+	 */
+	public String getType();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/IPattern.java b/javascript/extractor/src/com/semmle/js/ast/IPattern.java
new file mode 100644
index 00000000000..e14da5b5157
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/IPattern.java
@@ -0,0 +1,8 @@
+package com.semmle.js.ast;
+
+/**
+ * A marker interface encompassing variables ({@link Identifier}) and complex patterns
+ * used in destructuring assignments ({@link ArrayPattern}, {@link ObjectPattern}).
+ */
+public interface IPattern extends INode {
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ISourceElement.java b/javascript/extractor/src/com/semmle/js/ast/ISourceElement.java
new file mode 100644
index 00000000000..0aa745d7b39
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ISourceElement.java
@@ -0,0 +1,11 @@
+package com.semmle.js.ast;
+
+/**
+ * A source code element potentially associated with a location.
+ */
+public interface ISourceElement {
+	/**
+	 * Get the source location of this element; may be null.
+	 */
+	public SourceLocation getLoc();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/IStatementContainer.java b/javascript/extractor/src/com/semmle/js/ast/IStatementContainer.java
new file mode 100644
index 00000000000..3dd7a7dc37c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/IStatementContainer.java
@@ -0,0 +1,7 @@
+package com.semmle.js.ast;
+
+/**
+ * A statement container, that is, either a {@link Program} or a {@link IFunction}.
+ */
+public interface IStatementContainer extends INode {
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Identifier.java b/javascript/extractor/src/com/semmle/js/ast/Identifier.java
new file mode 100644
index 00000000000..4a1a94748fb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Identifier.java
@@ -0,0 +1,45 @@
+package com.semmle.js.ast;
+
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * An identifier.
+ *
+ * Identifiers can either be variable declarations (like <code>x</code> in <code>var x;</code>),
+ * variable references (like <code>x</code> in <code>x = 42</code>), property names
+ * (like <code>f</code> in <code>e.f</code>), statement labels (like <code>l</code> in
+ * <code>l: while(true);</code>), or statement label references (like <code>l</code> in
+ * <code>break l;</code>).
+ */
+public class Identifier extends Expression implements IPattern, ITypeExpression, INodeWithSymbol {
+	private final String name;
+	private int symbol = -1;
+
+	public Identifier(SourceLocation loc, String name) {
+		super("Identifier", loc);
+		this.name = name;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The name of this identifier.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public int getSymbol() {
+		return symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/IfStatement.java b/javascript/extractor/src/com/semmle/js/ast/IfStatement.java
new file mode 100644
index 00000000000..e144ed2e8db
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/IfStatement.java
@@ -0,0 +1,49 @@
+package com.semmle.js.ast;
+
+/**
+ * An if statement.
+ */
+public class IfStatement extends Statement {
+	private final Expression test;
+	private final Statement consequent, alternate;
+
+	public IfStatement(SourceLocation loc, Expression test, Statement consequent, Statement alternate) {
+		super("IfStatement", loc);
+		this.test = test;
+		this.consequent = consequent;
+		this.alternate = alternate;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The test expression of this if statement.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	/**
+	 * The then-branch of this if statement.
+	 */
+	public Statement getConsequent() {
+		return consequent;
+	}
+
+	/**
+	 * The else-branch of this if statement; may be null.
+	 */
+	public Statement getAlternate() {
+		return alternate;
+	}
+
+	/**
+	 * Does this if statement have an else branch?
+	 */
+	public boolean hasAlternate() {
+		return alternate != null;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ImportDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/ImportDeclaration.java
new file mode 100644
index 00000000000..500a2b9203e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ImportDeclaration.java
@@ -0,0 +1,42 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * An import declaration, which can be of one of the following forms:
+ *
+ * <pre>
+ *   import v from "m";
+ *   import * as ns from "m";
+ *   import {x, y, w as z} from "m";
+ *   import v, * as ns from "m";
+ *   import v, {x, y, w as z} from "m";
+ *   import "m";
+ * </pre>
+ */
+public class ImportDeclaration extends Statement {
+	/** List of import specifiers detailing how declarations are imported; may be empty. */
+	private final List<ImportSpecifier> specifiers;
+
+	/** The module from which declarations are imported. */
+	private final Literal source;
+
+	public ImportDeclaration(SourceLocation loc, List<ImportSpecifier> specifiers, Literal source) {
+		super("ImportDeclaration", loc);
+		this.specifiers = specifiers;
+		this.source = source;
+	}
+
+	public Literal getSource() {
+		return source;
+	}
+
+	public List<ImportSpecifier> getSpecifiers() {
+		return specifiers;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ImportDefaultSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ImportDefaultSpecifier.java
new file mode 100644
index 00000000000..6752ef53c9b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ImportDefaultSpecifier.java
@@ -0,0 +1,19 @@
+package com.semmle.js.ast;
+
+/**
+ * A default import specifier, such as <code>f</code> in
+ * <code>import f, { x, y } from 'foo';</code>.
+ *
+ * Default import specifiers do not have an explicit imported name
+ * (the imported name is, implicitly, <code>default</code>).
+ */
+public class ImportDefaultSpecifier extends ImportSpecifier {
+	public ImportDefaultSpecifier(SourceLocation loc, Identifier local) {
+		super("ImportDefaultSpecifier", loc, null, local);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ImportNamespaceSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ImportNamespaceSpecifier.java
new file mode 100644
index 00000000000..e33516247e2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ImportNamespaceSpecifier.java
@@ -0,0 +1,18 @@
+package com.semmle.js.ast;
+
+/**
+ * A namespace import specifier such as <code>* as foo</code> in
+ * <code>import * as foo from 'foo';</code>.
+ *
+ * Namespace import specifiers do not have an imported name.
+ */
+public class ImportNamespaceSpecifier extends ImportSpecifier {
+	public ImportNamespaceSpecifier(SourceLocation loc, Identifier local) {
+		super("ImportNamespaceSpecifier", loc, null, local);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ImportSpecifier.java b/javascript/extractor/src/com/semmle/js/ast/ImportSpecifier.java
new file mode 100644
index 00000000000..146bafa6b9a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ImportSpecifier.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast;
+
+/**
+ * An import specifier such as <code>x</code> and <code>y as z</code> in
+ * <code>import { x, y as z } from 'foo';</code>.
+ *
+ * An import specifier has a local name and an imported name; for instance,
+ * <code>y as z</code> has local name <code>z</code> and imported name <code>y</code>,
+ * while <code>x</code> has both local and imported name <code>x</code>.
+ */
+public class ImportSpecifier extends Expression {
+	private final Identifier imported, local;
+
+	public ImportSpecifier(SourceLocation loc, Identifier imported, Identifier local) {
+		this("ImportSpecifier", loc, imported, local);
+	}
+
+	public ImportSpecifier(String type, SourceLocation loc, Identifier imported, Identifier local) {
+		super(type, loc);
+		this.imported = imported;
+		this.local = local == imported ? new NodeCopier().copy(local) : local;
+	}
+
+	public Identifier getImported() {
+		return imported;
+	}
+
+	public Identifier getLocal() {
+		return local;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/InvokeExpression.java b/javascript/extractor/src/com/semmle/js/ast/InvokeExpression.java
new file mode 100644
index 00000000000..e8eebe1bc7f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/InvokeExpression.java
@@ -0,0 +1,73 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * An invocation, that is, either a {@link CallExpression} or a {@link NewExpression}.
+ */
+public abstract class InvokeExpression extends Expression implements INodeWithSymbol {
+	private final Expression callee;
+	private final List<ITypeExpression> typeArguments;
+	private final List<Expression> arguments;
+	private int resolvedSignatureId = -1;
+	private int overloadIndex = -1;
+	private int symbol = -1;
+
+	public InvokeExpression(String type, SourceLocation loc, Expression callee, List<ITypeExpression> typeArguments,
+			List<Expression> arguments) {
+		super(type, loc);
+		this.callee = callee;
+		this.typeArguments = typeArguments;
+		this.arguments = arguments;
+	}
+
+	/**
+	 * The callee expression of this invocation.
+	 */
+	public Expression getCallee() {
+		return callee;
+	}
+
+	/**
+	 * The type arguments of this invocation.
+	 */
+	public List<ITypeExpression> getTypeArguments() {
+		return typeArguments;
+	}
+
+	/**
+	 * The argument expressions of this invocation.
+	 */
+	public List<Expression> getArguments() {
+		return arguments;
+	}
+
+	public int getResolvedSignatureId() {
+		return resolvedSignatureId;
+	}
+
+	public void setResolvedSignatureId(int resolvedSignatureId) {
+		this.resolvedSignatureId = resolvedSignatureId;
+	}
+
+	public int getOverloadIndex() {
+		return overloadIndex;
+	}
+
+	public void setOverloadIndex(int overloadIndex) {
+		this.overloadIndex = overloadIndex;
+	}
+
+	@Override
+	public int getSymbol() {
+		return symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/JumpStatement.java b/javascript/extractor/src/com/semmle/js/ast/JumpStatement.java
new file mode 100644
index 00000000000..aa3c226a665
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/JumpStatement.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast;
+
+/**
+ * A jump statement, that is, either a {@link BreakStatement} or a {@link ContinueStatement}.
+ */
+public abstract class JumpStatement extends Statement {
+	private final Identifier label;
+
+	public JumpStatement(String type, SourceLocation loc, Identifier label) {
+		super(type, loc);
+		this.label = label;
+	}
+
+	/**
+	 * Does this jump have an explicit target label?
+	 */
+	public boolean hasLabel() {
+		return label != null;
+	}
+
+	/**
+	 * Get the target label of this jump; may be null.
+	 */
+	public Identifier getLabel() {
+		return label;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/LabeledStatement.java b/javascript/extractor/src/com/semmle/js/ast/LabeledStatement.java
new file mode 100644
index 00000000000..724dd80be9e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/LabeledStatement.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast;
+
+/**
+ * A labeled statement.
+ */
+public class LabeledStatement extends Statement {
+	private final Identifier label;
+	private final Statement body;
+
+	public LabeledStatement(SourceLocation loc, Identifier label, Statement body) {
+		super("LabeledStatement", loc);
+		this.label = label;
+		this.body = body;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The label of the labeled statement.
+	 */
+	public Identifier getLabel() {
+		return label;
+	}
+
+	/**
+	 * The statement wrapped by this labeled statement.
+	 */
+	public Statement getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/LetExpression.java b/javascript/extractor/src/com/semmle/js/ast/LetExpression.java
new file mode 100644
index 00000000000..2c6ff32cd02
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/LetExpression.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * An old-style let expression of the form <code>let (vardecls) expr</code>.
+ */
+public class LetExpression extends Expression {
+	private final List<VariableDeclarator> head;
+	private final Expression body;
+
+	public LetExpression(SourceLocation loc, List<VariableDeclarator> head, Expression body) {
+		super("LetExpression", loc);
+		this.head = head;
+		this.body = body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public List<VariableDeclarator> getHead() {
+		return head;
+	}
+
+	public Expression getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/LetStatement.java b/javascript/extractor/src/com/semmle/js/ast/LetStatement.java
new file mode 100644
index 00000000000..066e852426a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/LetStatement.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * An old-style let statement of the form <code>let(vardecls) stmt</code>.
+ */
+public class LetStatement extends Statement {
+	private final List<VariableDeclarator> head;
+	private final Statement body;
+
+	public LetStatement(SourceLocation loc, List<VariableDeclarator> head, Statement body) {
+		super("LetStatement", loc);
+		this.head = head;
+		this.body = body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public List<VariableDeclarator> getHead() {
+		return head;
+	}
+
+	public Statement getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Literal.java b/javascript/extractor/src/com/semmle/js/ast/Literal.java
new file mode 100644
index 00000000000..0216a9997e7
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Literal.java
@@ -0,0 +1,96 @@
+package com.semmle.js.ast;
+
+import com.semmle.jcorn.TokenType;
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * A literal constant.
+ * <p>
+ * A <tt>null</tt> literal may occur as a TypeScript type annotation - other
+ * literals are always expressions.
+ */
+public class Literal extends Expression implements ITypeExpression {
+	private final TokenType tokenType;
+	private final Object value;
+	private final String raw;
+
+	public Literal(SourceLocation loc, TokenType tokenType, Object value) {
+		super("Literal", loc);
+
+		// for numbers, check whether they can be represented as integers
+		if (value instanceof Double) {
+			Double dvalue = (Double)value;
+			if (dvalue >= Long.MIN_VALUE && dvalue <= Long.MAX_VALUE && (dvalue%1) == 0)
+				value = dvalue.longValue();
+		} else if (value instanceof CharSequence) {
+			value = value.toString();
+		}
+
+		this.tokenType = tokenType;
+		this.value = value;
+		this.raw = getLoc().getSource();
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The type of the token corresponding to this literal.
+	 */
+	public TokenType getTokenType() {
+		return tokenType;
+	}
+
+	/**
+	 * The value of this literal; may be null if this is a null literal or a literal whose value
+	 * cannot be represented by the parser.
+	 */
+	public Object getValue() {
+		return value;
+	}
+
+	/**
+	 * The source text of this literal.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+
+	/**
+	 * Is this a regular expression literal?
+	 */
+	public boolean isRegExp() {
+		return tokenType == TokenType.regexp;
+	}
+
+	/**
+	 * The value of this literal expressed as a string.
+	 */
+	public String getStringValue() {
+		// regular expressions may have a null value; use the raw value instead
+		if (isRegExp())
+			return raw;
+		return String.valueOf(value);
+	}
+
+	/**
+	 * Is the value of this literal falsy?
+	 */
+	public boolean isFalsy() {
+		if (isRegExp())
+			return false;
+		return value == null ||
+				value instanceof Number && ((Number)value).intValue() == 0 ||
+				value == Boolean.FALSE ||
+				value instanceof String && ((String)value).isEmpty();
+	}
+
+	/**
+	 * Is the value of this literal truthy?
+	 */
+	public boolean isTruthy() {
+		return !isFalsy();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/LogicalExpression.java b/javascript/extractor/src/com/semmle/js/ast/LogicalExpression.java
new file mode 100644
index 00000000000..7c9e0c7af47
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/LogicalExpression.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A short-circuiting binary expression, i.e., either <code>&amp;&amp;</code> or <code>||</code>.
+ */
+public class LogicalExpression extends ABinaryExpression {
+	public LogicalExpression(SourceLocation loc, String operator, Expression left, Expression right) {
+		super(loc, "LogicalExpression", operator, left, right);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Loop.java b/javascript/extractor/src/com/semmle/js/ast/Loop.java
new file mode 100644
index 00000000000..af9d37febb6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Loop.java
@@ -0,0 +1,26 @@
+package com.semmle.js.ast;
+
+/**
+ * A loop statement, that is, a {@link WhileStatement}, a {@link DoWhileStatement}, a {@link ForStatement},
+ * or a {@link EnhancedForStatement}.
+ */
+public abstract class Loop extends Statement {
+	protected final Statement body;
+
+	public Loop(String type, SourceLocation loc, Statement body) {
+		super(type, loc);
+		this.body = body;
+	}
+
+	/**
+	 * The loop body.
+	 */
+	public final Statement getBody() {
+		return body;
+	}
+
+	/**
+	 * The child node of this loop where execution resumes after a <code>continue</code> statement.
+	 */
+	public abstract Node getContinueTarget();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/MemberDefinition.java b/javascript/extractor/src/com/semmle/js/ast/MemberDefinition.java
new file mode 100644
index 00000000000..9fd15aa9ba9
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/MemberDefinition.java
@@ -0,0 +1,131 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A member definition in a {@linkplain ClassBody}.
+ *
+ * A member definition has a name and an optional initial value, whose type is
+ * given by the type parameter {@code V}.
+ */
+public abstract class MemberDefinition<V extends Expression> extends Node {
+	/**
+	 * A bitmask of flags defined in {@linkplain DeclarationFlags}.
+	 */
+	private final int flags;
+
+	/**
+	 * The name of the member.
+	 *
+	 * If {@link #isComputed} is false, this must be an {@link Identifier}, otherwise
+	 * it can be an arbitrary expression.
+	 */
+	private final Expression key;
+
+	/** The initial value of the member. */
+	private final V value;
+
+	/** The decorators applied to this member, if any. */
+	private final List<Decorator> decorators;
+
+	public MemberDefinition(String type, SourceLocation loc, int flags, Expression key, V value) {
+		super(type, loc);
+		this.flags = flags;
+		this.key = key;
+		this.value = value;
+		this.decorators = new ArrayList<Decorator>();
+	}
+
+	/** Returns the flags, as defined by {@linkplain DeclarationFlags}. */
+	public int getFlags() {
+		return flags;
+	}
+
+	/** Returns true if this has the <tt>static</tt> modifier. */
+	public boolean isStatic() {
+		return DeclarationFlags.isStatic(flags);
+	}
+
+	/** Returns true if the member name is computed. */
+	public boolean isComputed() {
+		return DeclarationFlags.isComputed(flags);
+	}
+
+	/** Returns true if this is an abstract member. */
+	public boolean isAbstract() {
+		return DeclarationFlags.isAbstract(flags);
+	}
+
+	/**
+	 * Returns true if has the <tt>public</tt> modifier (not true for implicitly
+	 * public members).
+	 */
+	public boolean hasPublicKeyword() {
+		return DeclarationFlags.isPublic(flags);
+	}
+
+	/** Returns true if this is a private member. */
+	public boolean hasPrivateKeyword() {
+		return DeclarationFlags.isPrivate(flags);
+	}
+
+	/** Returns true if this is a protected member. */
+	public boolean hasProtectedKeyword() {
+		return DeclarationFlags.isProtected(flags);
+	}
+
+	/** Returns true if this is a readonly member. */
+	public boolean hasReadonlyKeyword() {
+		return DeclarationFlags.isReadonly(flags);
+	}
+
+	/**
+	 * Returns the expression denoting the name of the member, or {@code null} if
+	 * this is a call/construct signature.
+	 */
+	public Expression getKey() {
+		return key;
+	}
+
+	public V getValue() {
+		return value;
+	}
+
+	/** The name of the method, if it can be determined. */
+	public String getName() {
+		if (!isComputed() && key instanceof Identifier)
+			return ((Identifier)key).getName();
+		if (key instanceof Literal)
+			return ((Literal)key).getStringValue();
+		return null;
+	}
+
+	/** True if this is a constructor; does not hold for construct signatures. */
+	public boolean isConstructor() {
+		return false;
+	}
+
+	/** True if this is a non-abstract field or a method with a body. */
+	public abstract boolean isConcrete();
+
+	public boolean isCallSignature() {
+		return false;
+	}
+
+	public boolean isIndexSignature() {
+		return false;
+	}
+
+	public void addDecorators(List<Decorator> decorators) {
+		this.decorators.addAll(decorators);
+	}
+
+	public List<Decorator> getDecorators() {
+		return this.decorators;
+	}
+
+	public boolean isParameterField() {
+		return false;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/MemberExpression.java b/javascript/extractor/src/com/semmle/js/ast/MemberExpression.java
new file mode 100644
index 00000000000..093e8a5b4c0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/MemberExpression.java
@@ -0,0 +1,57 @@
+package com.semmle.js.ast;
+
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * A member expression, either computed (<code>e[f]</code>) or static (<code>e.f</code>).
+ */
+public class MemberExpression extends Expression implements ITypeExpression, INodeWithSymbol {
+	private final Expression object, property;
+	private final boolean computed;
+	private int symbol = -1;
+
+	public MemberExpression(SourceLocation loc, Expression object, Expression property, Boolean computed) {
+		super("MemberExpression", loc);
+		this.object = object;
+		this.property = property;
+		this.computed = computed == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The base expression of this member expression.
+	 */
+	public Expression getObject() {
+		return object;
+	}
+
+	/**
+	 * The property expression of this member expression; for static member expressions this is always
+	 * an {@link Identifier}.
+	 */
+	public Expression getProperty() {
+		return property;
+	}
+
+	/**
+	 * Is this a computed member expression?
+	 */
+	public boolean isComputed() {
+		return computed;
+	}
+
+	@Override
+	public int getSymbol() {
+		return symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/MetaProperty.java b/javascript/extractor/src/com/semmle/js/ast/MetaProperty.java
new file mode 100644
index 00000000000..56b454d5ec3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/MetaProperty.java
@@ -0,0 +1,32 @@
+package com.semmle.js.ast;
+
+/**
+ * A meta property access (cf. ECMAScript 2015 Language Specification, Chapter 12.3.8).
+ *
+ * <p>
+ * Currently the only recognised meta properties are <code>new.target</code> and
+ * <code>function.sent</code>.
+ * </p>
+ */
+public class MetaProperty extends Expression {
+	private final Identifier meta, property;
+
+	public MetaProperty(SourceLocation loc, Identifier meta, Identifier property) {
+		super("MetaProperty", loc);
+		this.meta = meta;
+		this.property = property;
+	}
+
+	public Identifier getMeta() {
+		return meta;
+	}
+
+	public Identifier getProperty() {
+		return property;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/MethodDefinition.java b/javascript/extractor/src/com/semmle/js/ast/MethodDefinition.java
new file mode 100644
index 00000000000..6c28f2656da
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/MethodDefinition.java
@@ -0,0 +1,65 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class MethodDefinition extends MemberDefinition<FunctionExpression> {
+	public enum Kind {
+		CONSTRUCTOR, METHOD, GET, SET, FUNCTION_CALL_SIGNATURE, CONSTRUCTOR_CALL_SIGNATURE, INDEX_SIGNATURE
+	};
+
+	private final Kind kind;
+	private final List<FieldDefinition> parameterFields;
+
+	public MethodDefinition(SourceLocation loc, int flags, Kind kind, Expression key, FunctionExpression value) {
+		this(loc, flags, kind, key, value, new ArrayList<>());
+	}
+
+	public MethodDefinition(SourceLocation loc, int flags, Kind kind, Expression key, FunctionExpression value,
+			List<FieldDefinition> parameterFields) {
+		super("MethodDefinition", loc, flags, key, value);
+		this.kind = kind;
+		this.parameterFields = parameterFields;
+	}
+
+
+	public Kind getKind() {
+		return kind;
+	}
+
+	@Override
+	public boolean isCallSignature() {
+		return kind == Kind.FUNCTION_CALL_SIGNATURE || kind == Kind.CONSTRUCTOR_CALL_SIGNATURE;
+	}
+
+	@Override
+	public boolean isIndexSignature() {
+		return kind == Kind.INDEX_SIGNATURE;
+	}
+
+	@Override
+	public boolean isConstructor() {
+		return !isStatic() && !isComputed() && "constructor".equals(getName());
+	}
+
+	@Override
+	public boolean isConcrete() {
+		return getValue().getBody() != null;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	/**
+	 * Returns the parameter fields synthesized for initializing constructor
+	 * parameters, if this is a constructor, or an empty list otherwise.
+	 * <p>
+	 * The index in this list does not correspond to the parameter index, as there
+	 * can be ordinary parameters interleaved with parameter fields.
+	 */
+	public List<FieldDefinition> getParameterFields() {
+		return parameterFields;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/NewExpression.java b/javascript/extractor/src/com/semmle/js/ast/NewExpression.java
new file mode 100644
index 00000000000..eb5ba5d8eb4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/NewExpression.java
@@ -0,0 +1,19 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * A <code>new</code> expression.
+ */
+public class NewExpression extends InvokeExpression {
+	public NewExpression(SourceLocation loc, Expression callee, List<ITypeExpression> typeArguments, List<Expression> arguments) {
+		super("NewExpression", loc, callee, typeArguments, arguments);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Node.java b/javascript/extractor/src/com/semmle/js/ast/Node.java
new file mode 100644
index 00000000000..f49e0e838d4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Node.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast;
+
+/**
+ * Common superclass of all AST node types.
+ */
+public abstract class Node extends SourceElement implements INode {
+	private final String type;
+
+	public Node(String type, SourceLocation loc) {
+		super(loc);
+		this.type = type;
+	}
+
+	public final String getType() {
+		return type;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/NodeCopier.java b/javascript/extractor/src/com/semmle/js/ast/NodeCopier.java
new file mode 100644
index 00000000000..040b594b49b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/NodeCopier.java
@@ -0,0 +1,707 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportAsNamespaceDeclaration;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.GlobalAugmentationDeclaration;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+
+/**
+ * Deep cloning of AST nodes.
+ */
+public class NodeCopier implements Visitor<Void, INode> {
+	private Position visit(Position pos) {
+		return new Position(pos.getLine(), pos.getColumn(), pos.getOffset());
+	}
+
+	private SourceLocation visit(SourceLocation loc) {
+		return new SourceLocation(loc.getSource(), visit(loc.getStart()), visit(loc.getEnd()));
+	}
+
+	@SuppressWarnings("unchecked")
+	public <T extends INode> T copy(T t) {
+		if (t == null)
+			return null;
+		return (T) t.accept(this, null);
+	}
+
+	private <T extends INode> List<T> copy(List<T> ts) {
+		List<T> result = new ArrayList<T>();
+		for (T t : ts)
+			result.add(copy(t));
+		return result;
+	}
+
+	@Override
+	public AssignmentExpression visit(AssignmentExpression nd, Void q) {
+		return new AssignmentExpression(visit(nd.getLoc()), nd.getOperator(), copy(nd.getLeft()), copy(nd.getRight()));
+	}
+
+	@Override
+	public AssignmentPattern visit(AssignmentPattern nd, Void q) {
+		return new AssignmentPattern(visit(nd.getLoc()), nd.getOperator(), copy(nd.getLeft()), copy(nd.getRight()));
+	}
+
+	@Override
+	public BinaryExpression visit(BinaryExpression nd, Void q) {
+		return new BinaryExpression(visit(nd.getLoc()), nd.getOperator(), copy(nd.getLeft()), copy(nd.getRight()));
+	}
+
+	@Override
+	public BlockStatement visit(BlockStatement nd, Void q) {
+		return new BlockStatement(visit(nd.getLoc()), copy(nd.getBody()));
+	}
+
+	@Override
+	public CallExpression visit(CallExpression nd, Void q) {
+		return new CallExpression(visit(nd.getLoc()), copy(nd.getCallee()), copy(nd.getTypeArguments()), copy(nd.getArguments()));
+	}
+
+	@Override
+	public ComprehensionBlock visit(ComprehensionBlock nd, Void q) {
+		return new ComprehensionBlock(visit(nd.getLoc()), copy(nd.getLeft()), copy(nd.getRight()), nd.isOf());
+	}
+
+	@Override
+	public ComprehensionExpression visit(ComprehensionExpression nd, Void q) {
+		return new ComprehensionExpression(visit(nd.getLoc()), copy(nd.getBody()), copy(nd.getBlocks()), copy(nd.getFilter()), nd.isGenerator());
+	}
+
+	@Override
+	public ExpressionStatement visit(ExpressionStatement nd, Void q) {
+		return new ExpressionStatement(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public FunctionDeclaration visit(FunctionDeclaration nd, Void q) {
+		return new FunctionDeclaration(visit(nd.getLoc()), copy(nd.getId()),
+				copy(nd.getRawParameters()), copy(nd.getBody()), nd.isGenerator(), nd.isAsync(),
+				nd.hasDeclareKeyword(), copy(nd.getTypeParameters()), copy(nd.getParameterTypes()), copy(nd.getReturnType()),
+				copy(nd.getThisParameterType()));
+	}
+
+	@Override
+	public Identifier visit(Identifier nd, Void q) {
+		return new Identifier(visit(nd.getLoc()), nd.getName());
+	}
+
+	@Override
+	public Literal visit(Literal nd, Void q) {
+		return new Literal(visit(nd.getLoc()), nd.getTokenType(), nd.getValue());
+	}
+
+	@Override
+	public LogicalExpression visit(LogicalExpression nd, Void q) {
+		return new LogicalExpression(visit(nd.getLoc()), nd.getOperator(), copy(nd.getLeft()), copy(nd.getRight()));
+	}
+
+	@Override
+	public MemberExpression visit(MemberExpression nd, Void q) {
+		return new MemberExpression(visit(nd.getLoc()), copy(nd.getObject()), copy(nd.getProperty()), nd.isComputed());
+	}
+
+	@Override
+	public Program visit(Program nd, Void q) {
+		return new Program(visit(nd.getLoc()), copy(nd.getBody()), nd.getSourceType());
+	}
+
+	@Override
+	public UnaryExpression visit(UnaryExpression nd, Void q) {
+		return new UnaryExpression(visit(nd.getLoc()), nd.getOperator(), copy(nd.getArgument()), nd.isPrefix());
+	}
+
+	@Override
+	public UpdateExpression visit(UpdateExpression nd, Void q) {
+		return new UpdateExpression(visit(nd.getLoc()), nd.getOperator(), copy(nd.getArgument()), nd.isPrefix());
+	}
+
+	@Override
+	public VariableDeclaration visit(VariableDeclaration nd, Void q) {
+		return new VariableDeclaration(visit(nd.getLoc()), nd.getKind(), copy(nd.getDeclarations()),
+				nd.hasDeclareKeyword());
+	}
+
+	@Override
+	public VariableDeclarator visit(VariableDeclarator nd, Void q) {
+		return new VariableDeclarator(visit(nd.getLoc()), copy(nd.getId()), copy(nd.getInit()), copy(nd.getTypeAnnotation()),
+				nd.getFlags());
+	}
+
+	@Override
+	public SwitchStatement visit(SwitchStatement nd, Void q) {
+		return new SwitchStatement(visit(nd.getLoc()), copy(nd.getDiscriminant()), copy(nd.getCases()));
+	}
+
+	@Override
+	public SwitchCase visit(SwitchCase nd, Void q) {
+		return new SwitchCase(visit(nd.getLoc()), copy(nd.getTest()), copy(nd.getConsequent()));
+	}
+
+	@Override
+	public ForStatement visit(ForStatement nd, Void q) {
+		return new ForStatement(visit(nd.getLoc()), copy(nd.getInit()), copy(nd.getTest()), copy(nd.getUpdate()), copy(nd.getBody()));
+	}
+
+	@Override
+	public ForInStatement visit(ForInStatement nd, Void q) {
+		return new ForInStatement(visit(nd.getLoc()), copy(nd.getLeft()), copy(nd.getRight()), copy(nd.getBody()), nd.isEach());
+	}
+
+	@Override
+	public ForOfStatement visit(ForOfStatement nd, Void q) {
+		return new ForOfStatement(visit(nd.getLoc()), copy(nd.getLeft()), copy(nd.getRight()), copy(nd.getBody()));
+	}
+
+	@Override
+	public Property visit(Property nd, Void q) {
+		return new Property(visit(nd.getLoc()), copy(nd.getKey()), copy(nd.getRawValue()), nd.getKind().name(), nd.isComputed(), nd.isMethod());
+	}
+
+	@Override
+	public ArrayPattern visit(ArrayPattern nd, Void q) {
+		return new ArrayPattern(visit(nd.getLoc()), copy(nd.getElements()));
+	}
+
+	@Override
+	public ObjectPattern visit(ObjectPattern nd, Void q) {
+		return new ObjectPattern(visit(nd.getLoc()), copy(nd.getRawProperties()));
+	}
+
+	@Override
+	public IfStatement visit(IfStatement nd, Void q) {
+		return new IfStatement(visit(nd.getLoc()), copy(nd.getTest()), copy(nd.getConsequent()), copy(nd.getAlternate()));
+	}
+
+	@Override
+	public LabeledStatement visit(LabeledStatement nd, Void q) {
+		return new LabeledStatement(visit(nd.getLoc()), copy(nd.getLabel()), copy(nd.getBody()));
+	}
+
+	@Override
+	public WithStatement visit(WithStatement nd, Void q) {
+		return new WithStatement(visit(nd.getLoc()), copy(nd.getObject()), copy(nd.getBody()));
+	}
+
+	@Override
+	public DoWhileStatement visit(DoWhileStatement nd, Void q) {
+		return new DoWhileStatement(visit(nd.getLoc()), copy(nd.getTest()), copy(nd.getBody()));
+	}
+
+	@Override
+	public WhileStatement visit(WhileStatement nd, Void q) {
+		return new WhileStatement(visit(nd.getLoc()), copy(nd.getTest()), copy(nd.getBody()));
+	}
+
+	@Override
+	public CatchClause visit(CatchClause nd, Void q) {
+		return new CatchClause(visit(nd.getLoc()), copy(nd.getParam()), copy(nd.getGuard()), copy(nd.getBody()));
+	}
+
+	@Override
+	public TryStatement visit(TryStatement nd, Void q) {
+		return new TryStatement(visit(nd.getLoc()), copy(nd.getBlock()), copy(nd.getHandler()), copy(nd.getGuardedHandlers()), copy(nd.getFinalizer()));
+	}
+
+	@Override
+	public NewExpression visit(NewExpression nd, Void q) {
+		return new NewExpression(visit(nd.getLoc()), copy(nd.getCallee()), copy(nd.getTypeArguments()), copy(nd.getArguments()));
+	}
+
+	@Override
+	public ReturnStatement visit(ReturnStatement nd, Void q) {
+		return new ReturnStatement(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public ThrowStatement visit(ThrowStatement nd, Void q) {
+		return new ThrowStatement(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public SpreadElement visit(SpreadElement nd, Void q) {
+		return new SpreadElement(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public RestElement visit(RestElement nd, Void q) {
+		return new RestElement(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public YieldExpression visit(YieldExpression nd, Void q) {
+		return new YieldExpression(visit(nd.getLoc()), copy(nd.getArgument()), nd.isDelegating());
+	}
+
+	@Override
+	public ParenthesizedExpression visit(ParenthesizedExpression nd, Void q) {
+		return new ParenthesizedExpression(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public EmptyStatement visit(EmptyStatement nd, Void q) {
+		return new EmptyStatement(visit(nd.getLoc()));
+	}
+
+	@Override
+	public BreakStatement visit(BreakStatement nd, Void q) {
+		return new BreakStatement(visit(nd.getLoc()), copy(nd.getLabel()));
+	}
+
+	@Override
+	public ContinueStatement visit(ContinueStatement nd, Void q) {
+		return new ContinueStatement(visit(nd.getLoc()), copy(nd.getLabel()));
+	}
+
+	@Override
+	public FunctionExpression visit(FunctionExpression nd, Void q) {
+		return new FunctionExpression(visit(nd.getLoc()), copy(nd.getId()),
+				copy(nd.getRawParameters()), copy(nd.getBody()), nd.isGenerator(), nd.isAsync(),
+				copy(nd.getTypeParameters()), copy(nd.getParameterTypes()), copy(nd.getParameterDecorators()), copy(nd.getReturnType()),
+				copy(nd.getThisParameterType()));
+	}
+
+	@Override
+	public DebuggerStatement visit(DebuggerStatement nd, Void q) {
+		return new DebuggerStatement(visit(nd.getLoc()));
+	}
+
+	@Override
+	public ArrayExpression visit(ArrayExpression nd, Void q) {
+		return new ArrayExpression(visit(nd.getLoc()), copy(nd.getElements()));
+	}
+
+	@Override
+	public ObjectExpression visit(ObjectExpression nd, Void q) {
+		return new ObjectExpression(visit(nd.getLoc()), copy(nd.getProperties()));
+	}
+
+	@Override
+	public ThisExpression visit(ThisExpression nd, Void q) {
+		return new ThisExpression(visit(nd.getLoc()));
+	}
+
+	@Override
+	public ConditionalExpression visit(ConditionalExpression nd, Void q) {
+		return new ConditionalExpression(visit(nd.getLoc()), copy(nd.getTest()), copy(nd.getConsequent()), copy(nd.getAlternate()));
+	}
+
+	@Override
+	public SequenceExpression visit(SequenceExpression nd, Void q) {
+		return new SequenceExpression(visit(nd.getLoc()), copy(nd.getExpressions()));
+	}
+
+	@Override
+	public TemplateElement visit(TemplateElement nd, Void q) {
+		return new TemplateElement(visit(nd.getLoc()), nd.getCooked(), nd.getRaw(), nd.isTail());
+	}
+
+	@Override
+	public TemplateLiteral visit(TemplateLiteral nd, Void q) {
+		return new TemplateLiteral(visit(nd.getLoc()), copy(nd.getExpressions()), copy(nd.getQuasis()));
+	}
+
+	@Override
+	public TaggedTemplateExpression visit(TaggedTemplateExpression nd, Void q) {
+		return new TaggedTemplateExpression(visit(nd.getLoc()), copy(nd.getTag()), copy(nd.getQuasi()));
+	}
+
+	@Override
+	public ArrowFunctionExpression visit(ArrowFunctionExpression nd, Void q) {
+		return new ArrowFunctionExpression(visit(nd.getLoc()), copy(nd.getRawParameters()), copy(nd.getBody()), nd.isGenerator(),
+				nd.isAsync(), copy(nd.getTypeParameters()), copy(nd.getParameterTypes()), copy(nd.getReturnType()));
+	}
+
+	@Override
+	public LetStatement visit(LetStatement nd, Void q) {
+		return new LetStatement(visit(nd.getLoc()), copy(nd.getHead()), copy(nd.getBody()));
+	}
+
+	@Override
+	public LetExpression visit(LetExpression nd, Void c) {
+		return new LetExpression(visit(nd.getLoc()), copy(nd.getHead()), copy(nd.getBody()));
+	}
+
+	@Override
+	public ClassDeclaration visit(ClassDeclaration nd, Void c) {
+		return new ClassDeclaration(visit(nd.getLoc()), visit(nd.getClassDef()), nd.hasDeclareKeyword(), nd.hasAbstractKeyword());
+	}
+
+	@Override
+	public ClassExpression visit(ClassExpression nd, Void c) {
+		return new ClassExpression(visit(nd.getLoc()), visit(nd.getClassDef()));
+	}
+
+	private AClass visit(AClass nd) {
+		return new AClass(copy(nd.getId()), copy(nd.getTypeParameters()), copy(nd.getSuperClass()), copy(nd.getSuperInterfaces()),
+				copy(nd.getBody()));
+	}
+
+	@Override
+	public ClassBody visit(ClassBody nd, Void c) {
+		return new ClassBody(visit(nd.getLoc()), copy(nd.getBody()));
+	}
+
+	@Override
+	public MethodDefinition visit(MethodDefinition nd, Void c) {
+		return new MethodDefinition(visit(nd.getLoc()), nd.getFlags(), nd.getKind(),
+				copy(nd.getKey()), copy(nd.getValue()), copy(nd.getParameterFields()));
+	}
+
+	@Override
+	public FieldDefinition visit(FieldDefinition nd, Void c) {
+		return new FieldDefinition(visit(nd.getLoc()), nd.getFlags(), copy(nd.getKey()),
+				copy(nd.getValue()), copy(nd.getTypeAnnotation()));
+	}
+
+	@Override
+	public Super visit(Super nd, Void c) {
+		return new Super(visit(nd.getLoc()));
+	}
+
+	@Override
+	public MetaProperty visit(MetaProperty nd, Void c) {
+		return new MetaProperty(visit(nd.getLoc()), copy(nd.getMeta()), copy(nd.getProperty()));
+	}
+
+	@Override
+	public ExportAllDeclaration visit(ExportAllDeclaration nd, Void c) {
+		return new ExportAllDeclaration(visit(nd.getLoc()), copy(nd.getSource()));
+	}
+
+	@Override
+	public ExportDefaultDeclaration visit(ExportDefaultDeclaration nd, Void c) {
+		return new ExportDefaultDeclaration(visit(nd.getLoc()), copy(nd.getDeclaration()));
+	}
+
+	@Override
+	public ExportNamedDeclaration visit(ExportNamedDeclaration nd, Void c) {
+		return new ExportNamedDeclaration(visit(nd.getLoc()), copy(nd.getDeclaration()), copy(nd.getSpecifiers()), copy(nd.getSource()));
+	}
+
+	@Override
+	public ExportDefaultSpecifier visit(ExportDefaultSpecifier nd, Void c) {
+		return new ExportDefaultSpecifier(visit(nd.getLoc()), copy(nd.getExported()));
+	}
+
+	@Override
+	public ExportNamespaceSpecifier visit(ExportNamespaceSpecifier nd, Void c) {
+		return new ExportNamespaceSpecifier(visit(nd.getLoc()), copy(nd.getExported()));
+	}
+
+	@Override
+	public ExportSpecifier visit(ExportSpecifier nd, Void c) {
+		return new ExportSpecifier(visit(nd.getLoc()), copy(nd.getLocal()), copy(nd.getExported()));
+	}
+
+	@Override
+	public ImportDeclaration visit(ImportDeclaration nd, Void c) {
+		return new ImportDeclaration(visit(nd.getLoc()), copy(nd.getSpecifiers()), copy(nd.getSource()));
+	}
+
+	@Override
+	public ImportDefaultSpecifier visit(ImportDefaultSpecifier nd, Void c) {
+		return new ImportDefaultSpecifier(visit(nd.getLoc()), copy(nd.getLocal()));
+	}
+
+	@Override
+	public ImportNamespaceSpecifier visit(ImportNamespaceSpecifier nd, Void c) {
+		return new ImportNamespaceSpecifier(visit(nd.getLoc()), copy(nd.getLocal()));
+	}
+
+	@Override
+	public ImportSpecifier visit(ImportSpecifier nd, Void c) {
+		return new ImportSpecifier(visit(nd.getLoc()), copy(nd.getImported()), copy(nd.getLocal()));
+	}
+
+	@Override
+	public INode visit(JSXIdentifier nd, Void c) {
+		return new JSXIdentifier(visit(nd.getLoc()), nd.getName());
+	}
+
+	@Override
+	public INode visit(JSXMemberExpression nd, Void c) {
+		return new JSXMemberExpression(visit(nd.getLoc()), copy(nd.getObject()), copy(nd.getName()));
+	}
+
+	@Override
+	public INode visit(JSXNamespacedName nd, Void c) {
+		return new JSXNamespacedName(visit(nd.getLoc()), copy(nd.getNamespace()), copy(nd.getName()));
+	}
+
+	@Override
+	public INode visit(JSXEmptyExpression nd, Void c) {
+		return new JSXEmptyExpression(visit(nd.getLoc()));
+	}
+
+	@Override
+	public INode visit(JSXExpressionContainer nd, Void c) {
+		return new JSXExpressionContainer(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public INode visit(JSXOpeningElement nd, Void c) {
+		return new JSXOpeningElement(visit(nd.getLoc()), copy(nd.getName()), copy(nd.getAttributes()), nd.isSelfClosing());
+	}
+
+	@Override
+	public INode visit(JSXClosingElement nd, Void c) {
+		return new JSXClosingElement(visit(nd.getLoc()), copy(nd.getName()));
+	}
+
+	@Override
+	public INode visit(JSXAttribute nd, Void c) {
+		return new JSXAttribute(visit(nd.getLoc()), copy(nd.getName()), copy(nd.getValue()));
+	}
+
+	@Override
+	public INode visit(JSXSpreadAttribute nd, Void c) {
+		return new JSXSpreadAttribute(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public INode visit(JSXElement nd, Void c) {
+		return new JSXElement(visit(nd.getLoc()), copy(nd.getOpeningElement()), copy(nd.getChildren()), copy(nd.getClosingElement()));
+	}
+
+	@Override
+	public INode visit(AwaitExpression nd, Void c) {
+		return new AwaitExpression(visit(nd.getLoc()), copy(nd.getArgument()));
+	}
+
+	@Override
+	public INode visit(Decorator nd, Void c) {
+		return new Decorator(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public INode visit(BindExpression nd, Void c) {
+		return new BindExpression(visit(nd.getLoc()), copy(nd.getObject()), copy(nd.getCallee()));
+	}
+
+	@Override
+	public INode visit(NamespaceDeclaration nd, Void c) {
+		return new NamespaceDeclaration(visit(nd.getLoc()), copy(nd.getName()), copy(nd.getBody()), nd.isInstantiated(),
+				nd.hasDeclareKeyword());
+	}
+
+	@Override
+	public INode visit(ImportWholeDeclaration nd, Void c) {
+		return new ImportWholeDeclaration(visit(nd.getLoc()), copy(nd.getLhs()), copy(nd.getRhs()));
+	}
+
+	@Override
+	public INode visit(ExportWholeDeclaration nd, Void c) {
+		return new ExportWholeDeclaration(visit(nd.getLoc()), copy(nd.getRhs()));
+	}
+
+	@Override
+	public INode visit(ExternalModuleReference nd, Void c) {
+		return new ExternalModuleReference(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public INode visit(DynamicImport nd, Void c) {
+		return new DynamicImport(visit(nd.getLoc()), copy(nd.getSource()));
+	}
+
+	@Override
+	public INode visit(InterfaceDeclaration nd, Void c) {
+		return new InterfaceDeclaration(visit(nd.getLoc()), copy(nd.getName()), copy(nd.getTypeParameters()), copy(nd.getSuperInterfaces()),
+				copy(nd.getBody()));
+	}
+
+	@Override
+	public INode visit(KeywordTypeExpr nd, Void c) {
+		return new KeywordTypeExpr(visit(nd.getLoc()), nd.getKeyword());
+	}
+
+	@Override
+	public INode visit(ArrayTypeExpr nd, Void c) {
+		return new ArrayTypeExpr(visit(nd.getLoc()), copy(nd.getElementType()));
+	}
+
+	@Override
+	public INode visit(UnionTypeExpr nd, Void c) {
+		return new UnionTypeExpr(visit(nd.getLoc()), copy(nd.getElementTypes()));
+	}
+
+	@Override
+	public INode visit(IndexedAccessTypeExpr nd, Void c) {
+		return new IndexedAccessTypeExpr(visit(nd.getLoc()), copy(nd.getObjectType()), copy(nd.getIndexType()));
+	}
+
+	@Override
+	public INode visit(IntersectionTypeExpr nd, Void c) {
+		return new IntersectionTypeExpr(visit(nd.getLoc()), copy(nd.getElementTypes()));
+	}
+
+	@Override
+	public INode visit(ParenthesizedTypeExpr nd, Void c) {
+		return new ParenthesizedTypeExpr(visit(nd.getLoc()), copy(nd.getElementType()));
+	}
+
+	@Override
+	public INode visit(TupleTypeExpr nd, Void c) {
+		return new TupleTypeExpr(visit(nd.getLoc()), copy(nd.getElementTypes()));
+	}
+
+	@Override
+	public INode visit(KeyofTypeExpr nd, Void c) {
+		return new KeyofTypeExpr(visit(nd.getLoc()), copy(nd.getElementType()));
+	}
+
+	@Override
+	public INode visit(GenericTypeExpr nd, Void c) {
+		return new GenericTypeExpr(visit(nd.getLoc()), copy(nd.getTypeName()), copy(nd.getTypeArguments()));
+	}
+
+	@Override
+	public INode visit(TypeofTypeExpr nd, Void c) {
+		return new TypeofTypeExpr(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public INode visit(IsTypeExpr nd, Void c) {
+		return new IsTypeExpr(visit(nd.getLoc()), copy(nd.getLeft()), copy(nd.getRight()));
+	}
+
+	@Override
+	public INode visit(InterfaceTypeExpr nd, Void c) {
+		return new InterfaceTypeExpr(visit(nd.getLoc()), copy(nd.getBody()));
+	}
+
+	@Override
+	public INode visit(ExpressionWithTypeArguments nd, Void c) {
+		return new ExpressionWithTypeArguments(visit(nd.getLoc()), copy(nd.getExpression()), copy(nd.getTypeArguments()));
+	}
+
+	@Override
+	public INode visit(TypeParameter nd, Void c) {
+		return new TypeParameter(visit(nd.getLoc()), copy(nd.getId()), copy(nd.getBound()), copy(nd.getDefault()));
+	}
+
+	@Override
+	public INode visit(FunctionTypeExpr nd, Void c) {
+		return new FunctionTypeExpr(visit(nd.getLoc()), copy(nd.getFunction()), nd.isConstructor());
+	}
+
+	@Override
+	public INode visit(TypeAssertion nd, Void c) {
+		return new TypeAssertion(visit(nd.getLoc()), copy(nd.getExpression()), copy(nd.getTypeAnnotation()), nd.isAsExpression());
+	}
+
+	@Override
+	public INode visit(MappedTypeExpr nd, Void c) {
+		return new MappedTypeExpr(visit(nd.getLoc()), copy(nd.getTypeParameter()), copy(nd.getElementType()));
+	}
+
+	@Override
+	public INode visit(TypeAliasDeclaration nd, Void c) {
+		return new TypeAliasDeclaration(visit(nd.getLoc()), copy(nd.getId()), copy(nd.getTypeParameters()), copy(nd.getDefinition()));
+	}
+
+	@Override
+	public INode visit(EnumDeclaration nd, Void c) {
+		return new EnumDeclaration(visit(nd.getLoc()), nd.isConst(), nd.hasDeclareKeyword(), copy(nd.getDecorators()), copy(nd.getId()),
+				copy(nd.getMembers()));
+	}
+
+	@Override
+	public INode visit(EnumMember nd, Void c) {
+		return new EnumMember(visit(nd.getLoc()), copy(nd.getId()), copy(nd.getInitializer()));
+	}
+
+	@Override
+	public INode visit(DecoratorList nd, Void c) {
+		return new DecoratorList(visit(nd.getLoc()), copy(nd.getDecorators()));
+	}
+
+	@Override
+	public INode visit(ExternalModuleDeclaration nd, Void c) {
+		return new ExternalModuleDeclaration(visit(nd.getLoc()), copy(nd.getName()), copy(nd.getBody()));
+	}
+
+	@Override
+	public INode visit(ExportAsNamespaceDeclaration nd, Void c) {
+		return new ExportAsNamespaceDeclaration(visit(nd.getLoc()), copy(nd.getId()));
+	}
+
+	@Override
+	public INode visit(GlobalAugmentationDeclaration nd, Void c) {
+		return new GlobalAugmentationDeclaration(visit(nd.getLoc()), copy(nd.getBody()));
+	}
+
+	@Override
+	public INode visit(NonNullAssertion nd, Void c) {
+		return new NonNullAssertion(visit(nd.getLoc()), copy(nd.getExpression()));
+	}
+
+	@Override
+	public INode visit(ConditionalTypeExpr nd, Void q) {
+		return new ConditionalTypeExpr(visit(nd.getLoc()), copy(nd.getCheckType()),
+				copy(nd.getExtendsType()), copy(nd.getTrueType()), copy(nd.getFalseType()));
+	}
+
+	@Override
+	public INode visit(InferTypeExpr nd, Void c) {
+		return new InferTypeExpr(visit(nd.getLoc()), copy(nd.getTypeParameter()));
+	}
+
+	@Override
+	public INode visit(ImportTypeExpr nd, Void c) {
+		return new ImportTypeExpr(visit(nd.getLoc()), copy(nd.getPath()));
+	}
+
+	@Override
+	public INode visit(OptionalTypeExpr nd, Void c) {
+		return new OptionalTypeExpr(visit(nd.getLoc()), copy(nd.getElementType()));
+	}
+
+	@Override
+	public INode visit(RestTypeExpr nd, Void c) {
+		return new RestTypeExpr(visit(nd.getLoc()), copy(nd.getArrayType()));
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ObjectExpression.java b/javascript/extractor/src/com/semmle/js/ast/ObjectExpression.java
new file mode 100644
index 00000000000..1c41bba9c54
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ObjectExpression.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * An object literal.
+ */
+public class ObjectExpression extends Expression {
+	private final List<Property> properties;
+
+	public ObjectExpression(SourceLocation loc, List<Property> properties) {
+		super("ObjectExpression", loc);
+		this.properties = properties;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The properties in this literal.
+	 */
+	public List<Property> getProperties() {
+		return properties;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ObjectPattern.java b/javascript/extractor/src/com/semmle/js/ast/ObjectPattern.java
new file mode 100644
index 00000000000..f8c8a70412e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ObjectPattern.java
@@ -0,0 +1,62 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * An object pattern.
+ */
+public class ObjectPattern extends Expression implements DestructuringPattern {
+	private final List<Property> rawProperties, properties;
+	private final Expression restPattern;
+
+	public ObjectPattern(SourceLocation loc, List<Property> properties) {
+		super("ObjectPattern", loc);
+		this.rawProperties = properties;
+		this.properties = new ArrayList<Property>(properties.size());
+		Expression rest = null;
+		for (Property prop : properties) {
+			Expression val = prop.getValue();
+			if (val instanceof RestElement) {
+				rest = ((RestElement)val).getArgument();
+			} else {
+				this.properties.add(prop);
+			}
+		}
+		this.restPattern = rest;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The property patterns in this literal.
+	 */
+	public List<Property> getProperties() {
+		return properties;
+	}
+
+	/**
+	 * Does this object pattern have a rest pattern?
+	 */
+	public boolean hasRest() {
+		return restPattern != null;
+	}
+
+	/**
+	 * The rest pattern of this literal, if any.
+	 */
+	public Expression getRest() {
+		return restPattern;
+	}
+
+	/**
+	 * The raw property patterns in this literal; the rest
+	 * pattern (if any) is represented as a {@link RestElement}.
+	 */
+	public List<Property> getRawProperties() {
+		return rawProperties;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ParenthesizedExpression.java b/javascript/extractor/src/com/semmle/js/ast/ParenthesizedExpression.java
new file mode 100644
index 00000000000..0c7bded5976
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ParenthesizedExpression.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+/**
+ * A parenthesized expression.
+ */
+public class ParenthesizedExpression extends Expression {
+	private final Expression expression;
+
+	public ParenthesizedExpression(SourceLocation loc, Expression expression) {
+		super("ParenthesizedExpression", loc);
+		this.expression = expression;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expression between parentheses.
+	 */
+	public Expression getExpression() {
+		return expression;
+	}
+
+	@Override
+	public Expression stripParens() {
+		return expression.stripParens();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Position.java b/javascript/extractor/src/com/semmle/js/ast/Position.java
new file mode 100644
index 00000000000..63e1d9155b0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Position.java
@@ -0,0 +1,81 @@
+package com.semmle.js.ast;
+
+/**
+ * A source position identifying a single character.
+ */
+public class Position implements Comparable<Position> {
+	private final int line, column, offset;
+
+	public Position(int line, int column, int offset) {
+		this.line = line;
+		this.column = column;
+		this.offset = offset;
+	}
+
+	/**
+	 * The line number (1-based) of this position.
+	 */
+	public int getLine() {
+		return line;
+	}
+
+	/**
+	 * The column number (1-based) of this position.
+	 */
+	public int getColumn() {
+		return column;
+	}
+
+	/**
+	 * The offset (0-based) of this position from the start
+	 * of the file, that is, the number of characters that
+	 * precede it.
+	 */
+	public int getOffset() {
+		return offset;
+	}
+
+	@Override
+	public int compareTo(Position that) {
+		if (this.line < that.line)
+			return -1;
+		if (this.line == that.line)
+			if (this.column < that.column)
+				return -1;
+			else if (this.column == that.column)
+				return 0;
+			else
+				return 1;
+		return 1;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + column;
+		result = prime * result + line;
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		Position other = (Position) obj;
+		if (column != other.column)
+			return false;
+		if (line != other.line)
+			return false;
+		return true;
+	}
+
+	@Override
+	public String toString() {
+		return line + ":" + column;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Program.java b/javascript/extractor/src/com/semmle/js/ast/Program.java
new file mode 100644
index 00000000000..4ebd89985bf
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Program.java
@@ -0,0 +1,44 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.ts.ast.INodeWithSymbol;
+
+/**
+ * A top-level program entity forming the root of an AST.
+ */
+public class Program extends Node implements IStatementContainer, INodeWithSymbol {
+	private final List<Statement> body;
+	private final String sourceType;
+	private int symbolId = -1;
+
+	public Program(SourceLocation loc, List<Statement> body, String sourceType) {
+		super("Program", loc);
+		this.body = body;
+		this.sourceType = sourceType;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The statements in this program.
+	 */
+	public List<Statement> getBody() {
+		return body;
+	}
+
+	public String getSourceType() {
+		return sourceType;
+	}
+
+	public int getSymbol() {
+		return this.symbolId;
+	}
+
+	public void setSymbol(int symbolId) {
+		this.symbolId = symbolId;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Property.java b/javascript/extractor/src/com/semmle/js/ast/Property.java
new file mode 100644
index 00000000000..df42c11876a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Property.java
@@ -0,0 +1,137 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.semmle.util.data.StringUtil;
+
+/**
+ * A property in an object literal or an object pattern.
+ *
+ * This includes both regular properties as well as accessor properties, method properties,
+ * properties with computed names, and spread/rest properties.
+ */
+public class Property extends Node {
+	public static enum Kind {
+		/** Either a normal property or a spread/rest property. */
+		INIT(false),
+
+		/** Getter property. */
+		GET(true),
+
+		/** Setter property. */
+		SET(true);
+
+		public final boolean isAccessor;
+
+		private Kind(boolean isAccessor) {
+			this.isAccessor = isAccessor;
+		}
+	};
+
+	private final Expression key;
+	private final Expression value, rawValue;
+	private final Expression defaultValue; // only applies to property patterns
+	private final Kind kind;
+	private final boolean computed, method;
+	private final List<Decorator> decorators;
+
+	public Property(SourceLocation loc, Expression key, Expression rawValue, String kind, Boolean computed, Boolean method) {
+		super("Property", loc);
+		this.key = key;
+		if (rawValue instanceof AssignmentPattern) {
+			AssignmentPattern ap = (AssignmentPattern) rawValue;
+			if (ap.getLeft() == key)
+				rawValue = ap = new AssignmentPattern(ap.getLoc(), ap.getOperator(), new NodeCopier().copy(key), ap.getRight());
+			this.value = ap.getLeft();
+			this.defaultValue = ap.getRight();
+		} else {
+			this.value = rawValue == key ? new NodeCopier().copy(rawValue) : rawValue;
+			this.defaultValue = null;
+		}
+		this.rawValue = rawValue;
+		this.kind = Kind.valueOf(StringUtil.uc(kind));
+		this.computed = computed == Boolean.TRUE;
+		this.method = method == Boolean.TRUE;
+		this.decorators = new ArrayList<Decorator>();
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The key of this property; usually a {@link Literal} or an {@link Identifier}, but may
+	 * be an arbitrary expression for properties with computed names. For spread/rest properties
+	 * this method returns {@code null}.
+	 */
+	public Expression getKey() {
+		return key;
+	}
+
+	/**
+	 * The value expression of this property.
+	 */
+	public Expression getValue() {
+		return value;
+	}
+
+	/**
+	 * The default value of this property pattern.
+	 */
+	public Expression getDefaultValue() {
+		return defaultValue;
+	}
+
+	/**
+	 * Is this a property pattern with a default value?
+	 */
+	public boolean hasDefaultValue() {
+		return defaultValue != null;
+	}
+
+	/**
+	 * The kind of this property.
+	 */
+	public Kind getKind() {
+		return kind;
+	}
+
+	/**
+	 * Is the name of this property computed?
+	 */
+	public boolean isComputed() {
+		return computed;
+	}
+
+	/**
+	 * Is this property declared using method syntax?
+	 */
+	public boolean isMethod() {
+		return method;
+	}
+
+	/**
+	 * Is this property declared using shorthand syntax?
+	 */
+	public boolean isShorthand() {
+		return key != null && key.getLoc().equals(value.getLoc());
+	}
+
+	/**
+	 * The raw value expression of this property; if this property is a property
+	 * pattern with a default value, this method returns an {@link AssignmentPattern}.
+	 */
+	public Expression getRawValue() {
+		return rawValue;
+	}
+
+	public void addDecorators(List<Decorator> decorators) {
+		this.decorators.addAll(decorators);
+	}
+
+	public List<Decorator> getDecorators() {
+		return this.decorators;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/RestElement.java b/javascript/extractor/src/com/semmle/js/ast/RestElement.java
new file mode 100644
index 00000000000..4b0fdb6e91f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/RestElement.java
@@ -0,0 +1,29 @@
+package com.semmle.js.ast;
+
+/**
+ * A rest element <code>...xs</code> in lvalue position.
+ *
+ * Rest elements can only appear as part of a function's parameter list or in an array
+ * pattern; they are rewritten away by the constructors of {@linkplain AFunction} and
+ * {@link ArrayPattern}, and don't appear in the AST the extractor works on.
+ */
+public class RestElement extends Expression implements IPattern {
+	private final Expression argument;
+
+	public RestElement(SourceLocation loc, Expression argument) {
+		super("RestElement", loc);
+		this.argument = argument;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The argument expression of this spread element.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ReturnStatement.java b/javascript/extractor/src/com/semmle/js/ast/ReturnStatement.java
new file mode 100644
index 00000000000..1487b6c7a5c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ReturnStatement.java
@@ -0,0 +1,32 @@
+package com.semmle.js.ast;
+
+/**
+ * A return statement.
+ */
+public class ReturnStatement extends Statement {
+	private final Expression argument;
+
+	public ReturnStatement(SourceLocation loc, Expression argument) {
+		super("ReturnStatement", loc);
+		this.argument = argument;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * Does this return statement have an argument expression?
+	 */
+	public boolean hasArgument() {
+		return argument != null;
+	}
+
+	/**
+	 * The argument expression of this return statement; may be null.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SequenceExpression.java b/javascript/extractor/src/com/semmle/js/ast/SequenceExpression.java
new file mode 100644
index 00000000000..246a7eaeeee
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SequenceExpression.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A comma expression containing two or more expressions evaluated in sequence.
+ */
+public class SequenceExpression extends Expression {
+	private final List<Expression> expressions;
+
+	public SequenceExpression(SourceLocation loc, List<Expression> expressions) {
+		super("SequenceExpression", loc);
+		this.expressions = expressions;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expressions in this sequence.
+	 */
+	public List<Expression> getExpressions() {
+		return expressions;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SourceElement.java b/javascript/extractor/src/com/semmle/js/ast/SourceElement.java
new file mode 100644
index 00000000000..bd587f9535f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SourceElement.java
@@ -0,0 +1,21 @@
+package com.semmle.js.ast;
+
+/**
+ * Common superclass of all source elements.
+ */
+public class SourceElement implements ISourceElement {
+	private final SourceLocation loc;
+
+	public SourceElement(SourceLocation loc) {
+		this.loc = loc;
+	}
+
+	public boolean hasLoc() {
+		return loc != null;
+	}
+
+	@Override
+	public final SourceLocation getLoc() {
+		return loc;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SourceLocation.java b/javascript/extractor/src/com/semmle/js/ast/SourceLocation.java
new file mode 100644
index 00000000000..2ef727051f5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SourceLocation.java
@@ -0,0 +1,96 @@
+package com.semmle.js.ast;
+
+/**
+ * A source location representing a range of characters.
+ */
+public class SourceLocation {
+	private String source;
+	private Position start, end;
+
+	public SourceLocation(String source, Position start, Position end) {
+		this.source = source;
+		this.start = start;
+		this.end = end;
+	}
+
+	public SourceLocation(Position start) {
+		this(null, start, null);
+	}
+
+	public SourceLocation(String source, Position start) {
+		this(source, start, null);
+	}
+
+	/**
+	 * The source code contained in this location.
+	 */
+	public String getSource() {
+		return source;
+	}
+
+	/**
+	 * Set the source code contain in this location.
+	 */
+	public void setSource(String source) {
+		this.source = source;
+	}
+
+	/**
+	 * The start position of the location.
+	 */
+	public Position getStart() {
+		return start;
+	}
+
+	/**
+	 * Set the start position of this location.
+	 */
+	public void setStart(Position start) {
+		this.start = start;
+	}
+
+	/**
+	 * The end position of the location.
+	 */
+	public Position getEnd() {
+		return end;
+	}
+
+	/**
+	 * Set the end position of this location.
+	 */
+	public void setEnd(Position end) {
+		this.end = end;
+	}
+
+	@Override
+	public int hashCode() {
+		final int prime = 31;
+		int result = 1;
+		result = prime * result + ((end == null) ? 0 : end.hashCode());
+		result = prime * result + ((start == null) ? 0 : start.hashCode());
+		return result;
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj)
+			return true;
+		if (obj == null)
+			return false;
+		if (getClass() != obj.getClass())
+			return false;
+		SourceLocation other = (SourceLocation) obj;
+		if (end == null) {
+			if (other.end != null)
+				return false;
+		} else if (!end.equals(other.end))
+			return false;
+		if (start == null) {
+			if (other.start != null)
+				return false;
+		} else if (!start.equals(other.start))
+			return false;
+		return true;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SpreadElement.java b/javascript/extractor/src/com/semmle/js/ast/SpreadElement.java
new file mode 100644
index 00000000000..189634195d4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SpreadElement.java
@@ -0,0 +1,25 @@
+package com.semmle.js.ast;
+
+/**
+ * A spread element <code>...xs</code> in rvalue position.
+ */
+public class SpreadElement extends Expression {
+	private final Expression argument;
+
+	public SpreadElement(SourceLocation loc, Expression argument) {
+		super("SpreadElement", loc);
+		this.argument = argument;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The argument expression of this spread element.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Statement.java b/javascript/extractor/src/com/semmle/js/ast/Statement.java
new file mode 100644
index 00000000000..4a53027272f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Statement.java
@@ -0,0 +1,10 @@
+package com.semmle.js.ast;
+
+/**
+ * Common superclass of all statements.
+ */
+public abstract class Statement extends Node {
+	public Statement(String type, SourceLocation loc) {
+		super(type, loc);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Super.java b/javascript/extractor/src/com/semmle/js/ast/Super.java
new file mode 100644
index 00000000000..d3f224dc08e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Super.java
@@ -0,0 +1,16 @@
+package com.semmle.js.ast;
+
+/**
+ * A <code>super</code> expression, appearing either as the callee of a super constructor
+ * call or as the receiver of a super method call.
+ */
+public class Super extends Expression {
+	public Super(SourceLocation loc) {
+		super("Super", loc);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SwitchCase.java b/javascript/extractor/src/com/semmle/js/ast/SwitchCase.java
new file mode 100644
index 00000000000..ec4418de076
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SwitchCase.java
@@ -0,0 +1,50 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A case in a switch statement; may be a default case.
+ */
+public class SwitchCase extends Statement {
+	private final Expression test;
+	private final List<Statement> consequent;
+
+	public SwitchCase(SourceLocation loc, Expression test, List<Statement> consequent) {
+		super("SwitchCase", loc);
+		this.test = test;
+		this.consequent = consequent;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * Does this case have a test expression?
+	 */
+	public boolean hasTest() {
+		return test != null;
+	}
+
+	/**
+	 * The test expression of this case; is null for default cases.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	/**
+	 * The statements belonging to this case.
+	 */
+	public List<Statement> getConsequent() {
+		return consequent;
+	}
+
+	/**
+	 * Is this a default case?
+	 */
+	public boolean isDefault() {
+		return !hasTest();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/SwitchStatement.java b/javascript/extractor/src/com/semmle/js/ast/SwitchStatement.java
new file mode 100644
index 00000000000..b31ce0db3ca
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/SwitchStatement.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+/**
+ * A switch statement.
+ */
+public class SwitchStatement extends Statement {
+	private final Expression discriminant;
+	private final List<SwitchCase> cases;
+
+	public SwitchStatement(SourceLocation loc, Expression discriminant, List<SwitchCase> cases) {
+		super("SwitchStatement", loc);
+		this.discriminant = discriminant;
+		this.cases = cases;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expression whose value is examined.
+	 */
+	public Expression getDiscriminant() {
+		return discriminant;
+	}
+
+	/**
+	 * The cases in this switch statement.
+	 */
+	public List<SwitchCase> getCases() {
+		return cases;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/TaggedTemplateExpression.java b/javascript/extractor/src/com/semmle/js/ast/TaggedTemplateExpression.java
new file mode 100644
index 00000000000..1ca642654ad
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/TaggedTemplateExpression.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast;
+
+/**
+ * A tagged template expression.
+ */
+public class TaggedTemplateExpression extends Expression {
+	private final Expression tag;
+	private final TemplateLiteral quasi;
+	
+	public TaggedTemplateExpression(SourceLocation loc, Expression tag, TemplateLiteral quasi) {
+		super("TaggedTemplateExpression", loc);
+		this.tag = tag;
+		this.quasi = quasi;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The tagging expression.
+	 */
+	public Expression getTag() {
+		return tag;
+	}
+
+	/**
+	 * The tagged template literal.
+	 */
+	public TemplateLiteral getQuasi() {
+		return quasi;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/TemplateElement.java b/javascript/extractor/src/com/semmle/js/ast/TemplateElement.java
new file mode 100644
index 00000000000..4331cb97ade
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/TemplateElement.java
@@ -0,0 +1,43 @@
+package com.semmle.js.ast;
+
+/**
+ * An element in a template literal.
+ */
+public class TemplateElement extends Expression {
+	private final Object cooked;
+	private final String raw;
+	private final boolean tail;
+
+	public TemplateElement(SourceLocation loc, Object cooked, String raw, Boolean tail) {
+		super("TemplateElement", loc);
+		this.cooked = cooked;
+		this.raw = raw;
+		this.tail = tail == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The "cooked" value of the template element.
+	 */
+	public Object getCooked() {
+		return cooked;
+	}
+
+	/**
+	 * The raw value of the template element.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+
+	/**
+	 * Is this the tail element?
+	 */
+	public boolean isTail() {
+		return tail;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/TemplateLiteral.java b/javascript/extractor/src/com/semmle/js/ast/TemplateLiteral.java
new file mode 100644
index 00000000000..34c40ecc732
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/TemplateLiteral.java
@@ -0,0 +1,82 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A template literal such as <code>`Hello, ${name}!`</code>.
+ *
+ * <p>
+ * In SpiderMonkey parlance, a template literal is composed of <i>quasis</i> (the constant parts of
+ * the template literal) and <i>expressions</i> (the variable parts). In the example,
+ * <code>"Hello, "</code> and <code>"!"</code> are the quasis, and <code>name</code> is the single
+ * expression.
+ * </p>
+ */
+public class TemplateLiteral extends Expression {
+	private final List<Expression> expressions;
+	private final List<TemplateElement> quasis;
+	private final List<Expression> children;
+
+	public TemplateLiteral(SourceLocation loc, List<Expression> expressions, List<TemplateElement> quasis) {
+		super("TemplateLiteral", loc);
+		this.expressions = expressions;
+		this.quasis = quasis;
+		this.children = mergeChildren(expressions, quasis);
+	}
+
+	/*
+	 * Merge quasis and expressions into a single array in textual order.
+	 * Also filter out the empty constant strings that the parser likes to generate.
+	 */
+	private List<Expression> mergeChildren(List<Expression> expressions, List<TemplateElement> quasis) {
+		List<Expression> children = new ArrayList<Expression>();
+		int j = 0, n = quasis.size();
+
+		for (int i=0, m=expressions.size(); i<m; ++i) {
+			Expression expr = expressions.get(i);
+			for (; j<n; ++j) {
+				TemplateElement quasi = quasis.get(j);
+				if (quasi.getLoc().getStart().compareTo(expr.getLoc().getStart()) > 0)
+					break;
+				if (!quasi.getRaw().isEmpty())
+					children.add(quasi);
+			}
+			children.add(expr);
+		}
+
+		for (; j<n; ++j) {
+			TemplateElement quasi = quasis.get(j);
+			if (!quasi.getRaw().isEmpty())
+				children.add(quasi);
+		}
+
+		return children;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expressions in this template.
+	 */
+	public List<Expression> getExpressions() {
+		return expressions;
+	}
+
+	/**
+	 * The template elements in this template.
+	 */
+	public List<TemplateElement> getQuasis() {
+		return quasis;
+	}
+
+	/**
+	 * All expressions and template elements in this template, in lexical order.
+	 */
+	public List<Expression> getChildren() {
+		return children;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ThisExpression.java b/javascript/extractor/src/com/semmle/js/ast/ThisExpression.java
new file mode 100644
index 00000000000..8ed3b12cfd2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ThisExpression.java
@@ -0,0 +1,15 @@
+package com.semmle.js.ast;
+
+/**
+ * A <code>this</code> expression.
+ */
+public class ThisExpression extends Expression {
+	public ThisExpression(SourceLocation loc) {
+		super("ThisExpression", loc);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/ThrowStatement.java b/javascript/extractor/src/com/semmle/js/ast/ThrowStatement.java
new file mode 100644
index 00000000000..6a938f0fe3f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/ThrowStatement.java
@@ -0,0 +1,25 @@
+package com.semmle.js.ast;
+
+/**
+ * A <code>throw</code> statement.
+ */
+public class ThrowStatement extends Statement {
+	private final Expression argument;
+
+	public ThrowStatement(SourceLocation loc, Expression argument) {
+		super("ThrowStatement", loc);
+		this.argument = argument;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The thrown expression.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Token.java b/javascript/extractor/src/com/semmle/js/ast/Token.java
new file mode 100644
index 00000000000..68e8ebb77ed
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Token.java
@@ -0,0 +1,75 @@
+package com.semmle.js.ast;
+
+import static com.semmle.js.ast.Token.Type.EOF;
+import static com.semmle.js.ast.Token.Type.FALSE;
+import static com.semmle.js.ast.Token.Type.KEYWORD;
+import static com.semmle.js.ast.Token.Type.NAME;
+import static com.semmle.js.ast.Token.Type.NULL;
+import static com.semmle.js.ast.Token.Type.NUM;
+import static com.semmle.js.ast.Token.Type.PUNCTUATOR;
+import static com.semmle.js.ast.Token.Type.REGEXP;
+import static com.semmle.js.ast.Token.Type.STRING;
+import static com.semmle.js.ast.Token.Type.TRUE;
+
+/**
+ * A source code token.
+ *
+ * This is not part of the SpiderMonkey AST format.
+ */
+public class Token extends SourceElement {
+	/**
+	 * The supported token types.
+	 */
+	public static enum Type { EOF, NULL, TRUE, FALSE, NUM, STRING, REGEXP, NAME, KEYWORD, PUNCTUATOR };
+
+	private final Type type;
+	private final String value;
+
+	public Token(SourceLocation loc, String typename, Object keyword) {
+		this(loc, getType(typename, keyword));
+	}
+
+	public Token(SourceLocation loc, Type type) {
+		super(loc);
+		this.value = loc.getSource();
+		this.type = type;
+	}
+
+	private static Type getType(String typename, Object keyword) {
+		if ("eof".equals(typename)) {
+			return EOF;
+		} else if ("num".equals(typename)) {
+			return NUM;
+		} else if("name".equals(typename) || "jsxName".equals(typename)) {
+			return NAME;
+		} else if("string".equals(typename) || "template".equals(typename) || "jsxText".equals(typename)) {
+			return STRING;
+		} else if("regexp".equals(typename)) {
+			return REGEXP;
+		} else if ("true".equals(keyword)) {
+			return TRUE;
+		} else if ("false".equals(keyword)) {
+			return FALSE;
+		} else if ("null".equals(keyword)) {
+			return NULL;
+		} else if (keyword instanceof String) {
+			return KEYWORD;
+		} else {
+			return PUNCTUATOR;
+		}
+	}
+
+	/**
+	 * The type of this token.
+	 */
+	public Type getType() {
+		return type;
+	}
+
+	/**
+	 * The source text of this token.
+	 */
+	public String getValue() {
+		return value;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/TryStatement.java b/javascript/extractor/src/com/semmle/js/ast/TryStatement.java
new file mode 100644
index 00000000000..b69b59a0531
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/TryStatement.java
@@ -0,0 +1,83 @@
+package com.semmle.js.ast;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A try statement.
+ */
+public class TryStatement extends Statement {
+	private final BlockStatement block;
+	private final CatchClause handler;
+	private final List<CatchClause> guardedHandlers, allHandlers;
+	private final BlockStatement finalizer;
+
+	public TryStatement(SourceLocation loc, BlockStatement block,
+			CatchClause handler, List<CatchClause> guardedHandlers,
+			BlockStatement finalizer) {
+		super("TryStatement", loc);
+		this.block = block;
+		this.handler = handler;
+		this.guardedHandlers = guardedHandlers;
+		this.finalizer = finalizer;
+		this.allHandlers = new ArrayList<CatchClause>();
+		if (guardedHandlers != null)
+			this.allHandlers.addAll(guardedHandlers);
+		if (handler != null)
+			this.allHandlers.add(handler);
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The body of this try statement.
+	 */
+	public BlockStatement getBlock() {
+		return block;
+	}
+
+	/**
+	 * The (single unguarded) catch clause of this try statement; may be null.
+	 */
+	public CatchClause getHandler() {
+		return handler;
+	}
+
+	/**
+	 * The guarded catch clauses of this try statement.
+	 */
+	public List<CatchClause> getGuardedHandlers() {
+		return guardedHandlers;
+	}
+
+	/**
+	 * The finally block of this try statement; may be null.
+	 */
+	public BlockStatement getFinalizer() {
+		return finalizer;
+	}
+
+	/**
+	 * All catch clauses (both guarded and unguarded) of this try statement in lexical order.
+	 */
+	public List<CatchClause> getAllHandlers() {
+		return allHandlers;
+	}
+
+	/**
+	 * Does this try statement have a finally block?
+	 */
+	public boolean hasFinalizer() {
+		return finalizer != null;
+	}
+
+	/**
+	 * Does this try statement have an unguarded catch block?
+	 */
+	public boolean hasHandler() {
+		return handler != null;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/UnaryExpression.java b/javascript/extractor/src/com/semmle/js/ast/UnaryExpression.java
new file mode 100644
index 00000000000..f33580563be
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/UnaryExpression.java
@@ -0,0 +1,46 @@
+package com.semmle.js.ast;
+
+/**
+ * A unary expression such as <code>!x</code> or <code>void(0)</code>.
+ *
+ * Note that increment and decrement expressions are represented by {@link UpdateExpression}.
+ */
+public class UnaryExpression extends Expression {
+	private final String operator;
+	private final Expression argument;
+	private final boolean prefix;
+
+	public UnaryExpression(SourceLocation loc, String operator, Expression argument, Boolean prefix) {
+		super("UnaryExpression", loc);
+		this.operator = operator;
+		this.argument = argument;
+		this.prefix = prefix == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The operator of this unary expression.
+	 */
+	public String getOperator() {
+		return operator;
+	}
+
+	/**
+	 * The argument of this unary expression.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+
+	/**
+	 * Is the operator of this unary expression a prefix operator?
+	 */
+	public boolean isPrefix() {
+		return prefix;
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/UpdateExpression.java b/javascript/extractor/src/com/semmle/js/ast/UpdateExpression.java
new file mode 100644
index 00000000000..50be7b0c4ef
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/UpdateExpression.java
@@ -0,0 +1,44 @@
+package com.semmle.js.ast;
+
+/**
+ * An increment or decrement expression.
+ */
+public class UpdateExpression extends Expression {
+	private final String operator;
+	private final Expression argument;
+	private final boolean prefix;
+
+	public UpdateExpression(SourceLocation loc, String operator, Expression argument, Boolean prefix) {
+		super("UpdateExpression", loc);
+		this.operator = operator;
+		this.argument = argument;
+		this.prefix = prefix == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The operator of this expression.
+	 */
+	public String getOperator() {
+		return operator;
+	}
+
+	/**
+	 * The argument of this expression.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+
+	/**
+	 * Is this a prefix increment or decrement expression?
+	 */
+	public boolean isPrefix() {
+		return prefix;
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/VariableDeclaration.java b/javascript/extractor/src/com/semmle/js/ast/VariableDeclaration.java
new file mode 100644
index 00000000000..287060d3873
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/VariableDeclaration.java
@@ -0,0 +1,54 @@
+package com.semmle.js.ast;
+
+import java.util.List;
+
+import com.semmle.js.extractor.ExtractorConfig.ECMAVersion;
+
+/**
+ * A variable declaration statement containing one or more {@link VariableDeclarator} expressions.
+ */
+public class VariableDeclaration extends Statement {
+	private final String kind;
+	private final List<VariableDeclarator> declarations;
+	private final boolean hasDeclareKeyword;
+
+	public VariableDeclaration(SourceLocation loc, String kind, List<VariableDeclarator> declarations, boolean hasDeclareKeyword) {
+		super("VariableDeclaration", loc);
+		this.kind = kind;
+		this.declarations = declarations;
+		this.hasDeclareKeyword = hasDeclareKeyword;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The kind of this variable declaration statement; one of <code>"var"</code>,
+	 * <code>"let"</code> or <code>"const"</code>.
+	 */
+	public String getKind() {
+		return kind;
+	}
+
+	/**
+	 * Is this a block-scoped declaration?
+	 *
+	 * Note that <code>const</code> declarations are function-scoped pre-ECMAScript 2015.
+	 */
+	public boolean isBlockScoped(ECMAVersion ecmaVersion) {
+		return "let".equals(kind) || ecmaVersion.compareTo(ECMAVersion.ECMA2015) >= 0 && "const".equals(kind);
+	}
+
+	/**
+	 * The declarations in this declaration statement.
+	 */
+	public List<VariableDeclarator> getDeclarations() {
+		return declarations;
+	}
+
+	public boolean hasDeclareKeyword() {
+		return hasDeclareKeyword;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/VariableDeclarator.java b/javascript/extractor/src/com/semmle/js/ast/VariableDeclarator.java
new file mode 100644
index 00000000000..12188746daf
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/VariableDeclarator.java
@@ -0,0 +1,69 @@
+package com.semmle.js.ast;
+
+import com.semmle.ts.ast.ITypeExpression;
+
+/**
+ * A variable declarator in a variable declaration statement.
+ */
+public class VariableDeclarator extends Expression {
+	private final IPattern id;
+	private final Expression init;
+	private final ITypeExpression typeAnnotation;
+
+	/**
+	 * A bitmask of flags defined in {@linkplain DeclarationFlags}.
+	 *
+	 * Currently only {@link DeclarationFlags#definiteAssignmentAssertion} may be set on
+	 * variable declarators.
+	 */
+	private final int flags;
+
+	public VariableDeclarator(SourceLocation loc, IPattern id, Expression init, ITypeExpression typeAnnotation, int flags) {
+		super("VariableDeclarator", loc);
+		this.id = id;
+		this.init = init;
+		this.typeAnnotation = typeAnnotation;
+		this.flags = flags;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The declared variable(s).
+	 */
+	public IPattern getId() {
+		return id;
+	}
+
+	/**
+	 * Does this variable declarator have an initializing expression?
+	 */
+	public boolean hasInit() {
+		return init != null;
+	}
+
+	/**
+	 * The initializing expression of this variable declarator; may be null.
+	 */
+	public Expression getInit() {
+		return init;
+	}
+
+	/**
+	 * The TypeScript type annotation for this variable; may be null.
+	 */
+	public ITypeExpression getTypeAnnotation() {
+		return typeAnnotation;
+	}
+
+	/**
+	 * Returns the modifiers set on this variable, as defined by
+	 * {@link DeclarationFlags}.
+	 */
+	public int getFlags() {
+		return this.flags;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/Visitor.java b/javascript/extractor/src/com/semmle/js/ast/Visitor.java
new file mode 100644
index 00000000000..ab27a2489e4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/Visitor.java
@@ -0,0 +1,177 @@
+package com.semmle.js.ast;
+
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportAsNamespaceDeclaration;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.GlobalAugmentationDeclaration;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+
+/**
+ * Interface for visitors to implement.
+ *
+ * Visit methods take a context argument of type {@link C} and return a result of type {@link R}.
+ */
+public interface Visitor<C, R> {
+	public R visit(AssignmentExpression nd, C q);
+	public R visit(AssignmentPattern nd, C q);
+	public R visit(BinaryExpression nd, C q);
+	public R visit(BlockStatement nd, C q);
+	public R visit(CallExpression nd, C q);
+	public R visit(ComprehensionBlock nd, C q);
+	public R visit(ComprehensionExpression nd, C q);
+	public R visit(ExpressionStatement nd, C q);
+	public R visit(FunctionDeclaration nd, C q);
+	public R visit(Identifier nd, C q);
+	public R visit(Literal nd, C q);
+	public R visit(LogicalExpression nd, C q);
+	public R visit(MemberExpression nd, C q);
+	public R visit(Program nd, C q);
+	public R visit(UnaryExpression nd, C q);
+	public R visit(UpdateExpression nd, C q);
+	public R visit(VariableDeclaration nd, C q);
+	public R visit(VariableDeclarator nd, C q);
+	public R visit(SwitchStatement nd, C q);
+	public R visit(SwitchCase nd, C q);
+	public R visit(ForStatement nd, C q);
+	public R visit(ForInStatement nd, C q);
+	public R visit(ForOfStatement nd, C q);
+	public R visit(Property nd, C q);
+	public R visit(ArrayPattern nd, C q);
+	public R visit(ObjectPattern nd, C q);
+	public R visit(IfStatement nd, C q);
+	public R visit(LabeledStatement nd, C q);
+	public R visit(WithStatement nd, C q);
+	public R visit(DoWhileStatement nd, C q);
+	public R visit(WhileStatement nd, C q);
+	public R visit(CatchClause nd, C q);
+	public R visit(TryStatement nd, C q);
+	public R visit(NewExpression nd, C q);
+	public R visit(ReturnStatement nd, C q);
+	public R visit(ThrowStatement nd, C q);
+	public R visit(SpreadElement nd, C q);
+	public R visit(RestElement nd, C q);
+	public R visit(YieldExpression nd, C q);
+	public R visit(ParenthesizedExpression nd, C q);
+	public R visit(EmptyStatement nd, C q);
+	public R visit(BreakStatement nd, C q);
+	public R visit(ContinueStatement nd, C q);
+	public R visit(FunctionExpression nd, C q);
+	public R visit(DebuggerStatement nd, C q);
+	public R visit(ArrayExpression nd, C q);
+	public R visit(ObjectExpression nd, C q);
+	public R visit(ThisExpression nd, C q);
+	public R visit(ConditionalExpression nd, C q);
+	public R visit(SequenceExpression nd, C q);
+	public R visit(TemplateElement nd, C q);
+	public R visit(TemplateLiteral nd, C q);
+	public R visit(TaggedTemplateExpression nd, C q);
+	public R visit(ArrowFunctionExpression nd, C q);
+	public R visit(LetStatement nd, C q);
+	public R visit(LetExpression nd, C c);
+	public R visit(ClassDeclaration nd, C c);
+	public R visit(ClassExpression nd, C c);
+	public R visit(ClassBody nd, C c);
+	public R visit(MethodDefinition nd, C c);
+	public R visit(FieldDefinition nd, C c);
+	public R visit(Super nd, C c);
+	public R visit(MetaProperty nd, C c);
+	public R visit(ExportAllDeclaration nd, C c);
+	public R visit(ExportDefaultDeclaration nd, C c);
+	public R visit(ExportNamedDeclaration nd, C c);
+	public R visit(ExportDefaultSpecifier nd, C c);
+	public R visit(ExportNamespaceSpecifier nd, C c);
+	public R visit(ExportSpecifier nd, C c);
+	public R visit(ImportDeclaration nd, C c);
+	public R visit(ImportDefaultSpecifier nd, C c);
+	public R visit(ImportNamespaceSpecifier nd, C c);
+	public R visit(ImportSpecifier nd, C c);
+	public R visit(JSXIdentifier nd, C c);
+	public R visit(JSXMemberExpression nd, C c);
+	public R visit(JSXNamespacedName nd, C c);
+	public R visit(JSXEmptyExpression nd, C c);
+	public R visit(JSXExpressionContainer nd, C c);
+	public R visit(JSXOpeningElement nd, C c);
+	public R visit(JSXClosingElement nd, C c);
+	public R visit(JSXAttribute nd, C c);
+	public R visit(JSXSpreadAttribute nd, C c);
+	public R visit(JSXElement nd, C c);
+	public R visit(AwaitExpression nd, C c);
+	public R visit(Decorator nd, C c);
+	public R visit(BindExpression nd, C c);
+	public R visit(NamespaceDeclaration nd, C c);
+	public R visit(ImportWholeDeclaration nd, C c);
+	public R visit(ExportWholeDeclaration nd, C c);
+	public R visit(ExternalModuleReference nd, C c);
+	public R visit(DynamicImport nd, C c);
+	public R visit(InterfaceDeclaration nd, C c);
+	public R visit(KeywordTypeExpr nd, C c);
+	public R visit(ArrayTypeExpr nd, C c);
+	public R visit(UnionTypeExpr nd, C c);
+	public R visit(IndexedAccessTypeExpr nd, C c);
+	public R visit(IntersectionTypeExpr nd, C c);
+	public R visit(ParenthesizedTypeExpr nd, C c);
+	public R visit(TupleTypeExpr nd, C c);
+	public R visit(KeyofTypeExpr nd, C c);
+	public R visit(GenericTypeExpr nd, C c);
+	public R visit(TypeofTypeExpr nd, C c);
+	public R visit(IsTypeExpr nd, C c);
+	public R visit(InterfaceTypeExpr nd, C c);
+	public R visit(ExpressionWithTypeArguments nd, C c);
+	public R visit(TypeParameter nd, C c);
+	public R visit(FunctionTypeExpr nd, C c);
+	public R visit(TypeAssertion nd, C c);
+	public R visit(MappedTypeExpr nd, C c);
+	public R visit(TypeAliasDeclaration nd, C c);
+	public R visit(EnumDeclaration nd, C c);
+	public R visit(EnumMember nd, C c);
+	public R visit(DecoratorList nd, C c);
+	public R visit(ExternalModuleDeclaration nd, C c);
+	public R visit(ExportAsNamespaceDeclaration nd, C c);
+	public R visit(GlobalAugmentationDeclaration nd, C c);
+	public R visit(NonNullAssertion nd, C c);
+	public R visit(ConditionalTypeExpr nd, C q);
+	public R visit(InferTypeExpr nd, C c);
+	public R visit(ImportTypeExpr nd, C c);
+	public R visit(OptionalTypeExpr nd, C c);
+	public R visit(RestTypeExpr nd, C c);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/WhileStatement.java b/javascript/extractor/src/com/semmle/js/ast/WhileStatement.java
new file mode 100644
index 00000000000..fc0df30c985
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/WhileStatement.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast;
+
+/**
+ * A while loop.
+ */
+public class WhileStatement extends Loop {
+	private final Expression test;
+
+	public WhileStatement(SourceLocation loc, Expression test, Statement body) {
+		super("WhileStatement", loc, body);
+		this.test = test;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The test expression of this while loop.
+	 */
+	public Expression getTest() {
+		return test;
+	}
+
+	@Override
+	public Node getContinueTarget() {
+		return test;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/WithStatement.java b/javascript/extractor/src/com/semmle/js/ast/WithStatement.java
new file mode 100644
index 00000000000..b54094ae9ac
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/WithStatement.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast;
+
+/**
+ * A with statement.
+ */
+public class WithStatement extends Statement {
+	private final Expression object;
+	private final Statement body;
+
+	public WithStatement(SourceLocation loc, Expression object, Statement body) {
+		super("WithStatement", loc);
+		this.object = object;
+		this.body = body;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The expression put into the context chain by this with statement.
+	 */
+	public Expression getObject() {
+		return object;
+	}
+
+	/**
+	 * The body of this with statement.
+	 */
+	public Statement getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/YieldExpression.java b/javascript/extractor/src/com/semmle/js/ast/YieldExpression.java
new file mode 100644
index 00000000000..e5dcbec1eb3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/YieldExpression.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast;
+
+/**
+ * A yield expression.
+ */
+public class YieldExpression extends Expression {
+	private final Expression argument;
+	private final boolean delegating;
+
+	public YieldExpression(SourceLocation loc, Expression argument, Boolean delegating) {
+		super("YieldExpression", loc);
+		this.argument = argument;
+		this.delegating = delegating == Boolean.TRUE;
+	}
+
+	@Override
+	public <Q, A> A accept(Visitor<Q, A> v, Q q) {
+		return v.visit(this, q);
+	}
+
+	/**
+	 * The argument of this yield expression.
+	 */
+	public Expression getArgument() {
+		return argument;
+	}
+
+	/**
+	 * Is this a delegating yield expression?
+	 */
+	public boolean isDelegating() {
+		return delegating;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/AllLiteral.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/AllLiteral.java
new file mode 100644
index 00000000000..a4dc25186d2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/AllLiteral.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A dont-care type expression <code>*</code>.
+ */
+public class AllLiteral extends JSDocTypeExpression {
+	public AllLiteral(SourceLocation loc) {
+		super(loc, "AllLiteral");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	@Override
+	public String pp() {
+		return "*";
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/ArrayType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/ArrayType.java
new file mode 100644
index 00000000000..59221859f87
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/ArrayType.java
@@ -0,0 +1,24 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An array type expression such as <code>[number]</code>.
+ */
+public class ArrayType extends CompoundType {
+	public ArrayType(SourceLocation loc, List<JSDocTypeExpression> elements) {
+		super("ArrayType", loc, elements);
+	}
+
+	@Override
+	public String pp() {
+		return "[" + super.pp(", ") + "]";
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/CompoundType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/CompoundType.java
new file mode 100644
index 00000000000..0e478407219
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/CompoundType.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass of {@link ArrayType} and {@link UnionType}.
+ */
+public abstract class CompoundType extends JSDocTypeExpression {
+	private final List<JSDocTypeExpression> elements;
+
+	public CompoundType(String type, SourceLocation loc, List<JSDocTypeExpression> elements) {
+		super(loc, type);
+		this.elements = elements;
+	}
+
+	protected String pp(String sep) {
+		StringBuilder sb = new StringBuilder();
+		for (JSDocTypeExpression element : elements) {
+			if (sb.length() > 0)
+				sb.append(sep);
+			sb.append(element.pp());
+		}
+		return sb.toString();
+	}
+
+	/**
+	 * The element type expressions of this compound type.
+	 */
+	public List<JSDocTypeExpression> getElements() {
+		return elements;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/FieldType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/FieldType.java
new file mode 100644
index 00000000000..0bb24c285ed
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/FieldType.java
@@ -0,0 +1,51 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A field type expression describing the type of a field in a record type.
+ */
+public class FieldType extends JSDocTypeExpression {
+	private final String key;
+	private final JSDocTypeExpression value;
+
+	public FieldType(SourceLocation loc, String key, JSDocTypeExpression value) {
+		super(loc, "FieldType");
+		this.key = key;
+		this.value = value;
+	}
+
+	/**
+	 * The field name.
+	 */
+	public String getKey() {
+		return key;
+	}
+
+	/**
+	 * Does this field type expression specify a type for the field?
+	 */
+	public boolean hasValue() {
+		return value != null;
+	}
+
+	/**
+	 * Get the type expression for the field; may be null.
+	 */
+	public JSDocTypeExpression getValue() {
+		return value;
+	}
+
+	@Override
+	public String pp() {
+		if (value != null)
+			return key + ": " + value.pp();
+		else
+			return key;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/FunctionType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/FunctionType.java
new file mode 100644
index 00000000000..72dfb7346e6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/FunctionType.java
@@ -0,0 +1,102 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A function type expression.
+ */
+public class FunctionType extends JSDocTypeExpression {
+	private final JSDocTypeExpression _this;
+	private final boolean _new;
+	private final List<JSDocTypeExpression> params;
+	private final JSDocTypeExpression result;
+
+	public FunctionType(SourceLocation loc, JSDocTypeExpression _this, Boolean _new, List<JSDocTypeExpression> params,
+			JSDocTypeExpression result) {
+		super(loc, "FunctionType");
+		this._this = _this;
+		this._new = _new == Boolean.TRUE;
+		this.params = params;
+		this.result = result;
+	}
+
+	@Override
+	public String pp() {
+		StringBuilder sb = new StringBuilder();
+
+		sb.append("function (");
+
+		if (_this != null) {
+			if (_new) {
+				sb.append("new: ");
+			} else {
+				sb.append("this: ");
+			}
+			sb.append(_this.pp());
+		}
+
+		for (JSDocTypeExpression param : params) {
+			if (sb.length() > 10)
+				sb.append(", ");
+			sb.append(param.pp());
+		}
+
+		sb.append(")");
+
+		if (result != null) {
+			sb.append(": ");
+			sb.append(result.pp());
+		}
+
+		return sb.toString();
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * Does this function type expression specify a receiver type, that is, a type for <code>this</code>?
+	 */
+	public boolean hasThis() {
+		return _this != null;
+	}
+
+	/**
+	 * Get the receiver type for this function expression; may be null.
+	 */
+	public JSDocTypeExpression getThis() {
+		return _this;
+	}
+
+	/**
+	 * Is this a constructor type?
+	 */
+	public boolean isNew() {
+		return _new;
+	}
+
+	/**
+	 * The parameter types of the function.
+	 */
+	public List<JSDocTypeExpression> getParams() {
+		return params;
+	}
+
+	/**
+	 * Does this function type specify a result type?
+	 */
+	public boolean hasResult() {
+		return result != null;
+	}
+
+	/**
+	 * The result type of the function; may be null.
+	 */
+	public JSDocTypeExpression getResult() {
+		return result;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocComment.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocComment.java
new file mode 100644
index 00000000000..24e087497b6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocComment.java
@@ -0,0 +1,47 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.Comment;
+
+/**
+ * A JSDoc comment.
+ */
+public class JSDocComment extends JSDocElement {
+	private final Comment comment;
+	private final String description;
+	private final List<JSDocTag> tags;
+	
+	public JSDocComment(Comment comment, String description, List<JSDocTag> tags) {
+		super(comment.getLoc());
+		this.comment = comment;
+		this.description = description;
+		this.tags = tags;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The underlying comment.
+	 */
+	public Comment getComment() {
+		return comment;
+	}
+
+	/**
+	 * The description string of this JSDoc comment.
+	 */
+	public String getDescription() {
+		return description;
+	}
+
+	/**
+	 * The block tags in this JSDoc comment.
+	 */
+	public List<JSDocTag> getTags() {
+		return tags;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocElement.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocElement.java
new file mode 100644
index 00000000000..f3a4b72d466
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocElement.java
@@ -0,0 +1,18 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass of all JSDoc AST nodes.
+ */
+public abstract class JSDocElement extends SourceElement {
+	public JSDocElement(SourceLocation loc) {
+		super(loc);
+	}
+
+	/**
+	 * Accept a visitor object.
+	 */
+	public abstract void accept(Visitor v);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTag.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTag.java
new file mode 100644
index 00000000000..0eb785f8495
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTag.java
@@ -0,0 +1,86 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A JSDoc block tag.
+ */
+public class JSDocTag extends JSDocElement {
+	private final String title;
+	private final String description;
+	private final String name;
+	private final JSDocTypeExpression type;
+	private final List<String> errors;
+
+	public JSDocTag(SourceLocation loc, String title, String description, String name, JSDocTypeExpression type, List<String> errors) {
+		super(loc);
+		this.title = title;
+		this.description = description;
+		this.name = name;
+		this.type = type;
+		this.errors = errors;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The type of this tag; e.g., <code>"param"</code> for a <code>@param</code> tag.
+	 */
+	public String getTitle() {
+		return title;
+	}
+
+	/**
+	 * Does this tag have a description?
+	 */
+	public boolean hasDescription() {
+		return description != null;
+	}
+
+	/**
+	 * The description of this tag; may be null.
+	 */
+	public String getDescription() {
+		return description;
+	}
+
+	/**
+	 * Does this tag specify a name?
+	 */
+	public boolean hasName() {
+		return name != null;
+	}
+
+	/**
+	 * The name this tag refers to; null except for <code>@param</code> tags.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * The type expression this tag specifies; may be null.
+	 */
+	public JSDocTypeExpression getType() {
+		return type;
+	}
+
+	/**
+	 * Does this tag specify a type expression?
+	 */
+	public boolean hasType() {
+		return type != null;
+	}
+
+	/**
+	 * Errors encountered while parsing this tag.
+	 */
+	public List<String> getErrors() {
+		return errors;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTypeExpression.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTypeExpression.java
new file mode 100644
index 00000000000..d15b8d5758c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/JSDocTypeExpression.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass of all JSDoc type expressions.
+ */
+public abstract class JSDocTypeExpression extends JSDocElement {
+	private final String type;
+
+	public JSDocTypeExpression(SourceLocation loc, String type) {
+		super(loc);
+		this.type = type;
+	}
+
+	/**
+	 * The type of the expression.
+	 */
+	public final String getType() {
+		return type;
+	}
+
+	/**
+	 * A pretty-printed representation of the type.
+	 */
+	public abstract String pp();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/NameExpression.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NameExpression.java
new file mode 100644
index 00000000000..7c0785890d0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NameExpression.java
@@ -0,0 +1,32 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A named JSDoc type.
+ */
+public class NameExpression extends JSDocTypeExpression {
+	private final String name;
+
+	public NameExpression(SourceLocation loc, String name) {
+		super(loc, "NameExpression");
+		this.name = name;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The type name.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	@Override
+	public String pp() {
+		return name;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/NonNullableType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NonNullableType.java
new file mode 100644
index 00000000000..15d1e2eb9e5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NonNullableType.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A non-nullable type such as <code>!string</code>.
+ */
+public class NonNullableType extends UnaryTypeConstructor {
+	public NonNullableType(SourceLocation loc, JSDocTypeExpression expression, Boolean prefix) {
+		super(loc, "NonNullableType", expression, prefix, "!");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullLiteral.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullLiteral.java
new file mode 100644
index 00000000000..8f20f2fd655
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullLiteral.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * The null type.
+ */
+public class NullLiteral extends JSDocTypeExpression {
+	public NullLiteral(SourceLocation loc) {
+		super(loc, "NullLiteral");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	@Override
+	public String pp() {
+		return "null";
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableLiteral.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableLiteral.java
new file mode 100644
index 00000000000..1e417926c67
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableLiteral.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A nullable dont-care type <code>?</code>.
+ */
+public class NullableLiteral extends JSDocTypeExpression {
+	public NullableLiteral(SourceLocation loc) {
+		super(loc, "NullableLiteral");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	@Override
+	public String pp() {
+		return "?";
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableType.java
new file mode 100644
index 00000000000..8e500f14c4d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/NullableType.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A nullable like <code>string?</code>.
+ */
+public class NullableType extends UnaryTypeConstructor {
+	public NullableType(SourceLocation loc, JSDocTypeExpression expression, Boolean prefix) {
+		super(loc, "NullableType", expression, prefix, "?");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/OptionalType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/OptionalType.java
new file mode 100644
index 00000000000..124339ecca3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/OptionalType.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An optional type like <code>=number</code>.
+ */
+public class OptionalType extends UnaryTypeConstructor {
+	public OptionalType(SourceLocation loc, JSDocTypeExpression expression) {
+		super(loc, "OptionalType", expression, false, "=");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/ParameterType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/ParameterType.java
new file mode 100644
index 00000000000..71be1a4a46b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/ParameterType.java
@@ -0,0 +1,41 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A parameter type expression describing the type of a named function parameter.
+ */
+public class ParameterType extends JSDocTypeExpression {
+	private final String name;
+	private final JSDocTypeExpression expression;
+
+	public ParameterType(SourceLocation loc, String name, JSDocTypeExpression expression) {
+		super(loc, "ParameterType");
+		this.name = name;
+		this.expression = expression;
+	}
+
+	/**
+	 * The name of the parameter.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * The type of the parameter.
+	 */
+	public JSDocTypeExpression getExpression() {
+		return expression;
+	}
+
+	@Override
+	public String pp() {
+		return name + ": " + expression.pp();
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/RecordType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/RecordType.java
new file mode 100644
index 00000000000..306b99828bc
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/RecordType.java
@@ -0,0 +1,42 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A record type.
+ */
+public class RecordType extends JSDocTypeExpression {
+	private final List<FieldType> fields;
+
+	public RecordType(SourceLocation loc, List<FieldType> fields) {
+		super(loc, "RecordType");
+		this.fields = fields;
+	}
+
+	/**
+	 * The types of the fields of the record.
+	 */
+	public List<FieldType> getFields() {
+		return fields;
+	}
+
+	@Override
+	public String pp() {
+		StringBuilder result = new StringBuilder("{");
+		String sep = "";
+		for (JSDocTypeExpression field : fields) {
+			result.append(sep);
+			result.append(field.pp());
+			sep = ", ";
+		}
+		result.append("}");
+		return result.toString();
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/RestType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/RestType.java
new file mode 100644
index 00000000000..21eba1a6b1f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/RestType.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A rest type expression like <code>...string</code>.
+ */
+public class RestType extends UnaryTypeConstructor {
+	public RestType(SourceLocation loc, JSDocTypeExpression expression) {
+		super(loc, "RestType", expression, true, "...");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/TypeApplication.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/TypeApplication.java
new file mode 100644
index 00000000000..eeadeaead6f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/TypeApplication.java
@@ -0,0 +1,57 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A type application like <code>Map.&lt;String, Object&gt;</code>.
+ */
+public class TypeApplication extends JSDocTypeExpression {
+	private final JSDocTypeExpression expression;
+	private final List<JSDocTypeExpression> applications;
+
+	public TypeApplication(SourceLocation loc, JSDocTypeExpression expression, List<JSDocTypeExpression> applications) {
+		super(loc, "TypeApplication");
+		this.expression = expression;
+		this.applications = applications;
+	}
+
+	@Override
+	public String pp() {
+		StringBuilder sb = new StringBuilder();
+		boolean first = true;
+
+		sb.append(expression.pp());
+		sb.append(".<");
+		for (JSDocTypeExpression application : applications) {
+			if (first)
+				first = false;
+			else
+				sb.append(", ");
+			sb.append(application.pp());
+		}
+		sb.append(">");
+
+		return sb.toString();
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The type constructor being applied.
+	 */
+	public JSDocTypeExpression getExpression() {
+		return expression;
+	}
+
+	/**
+	 * The arguments to the type constructor.
+	 */
+	public List<JSDocTypeExpression> getApplications() {
+		return applications;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnaryTypeConstructor.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnaryTypeConstructor.java
new file mode 100644
index 00000000000..77945850696
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnaryTypeConstructor.java
@@ -0,0 +1,45 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass of {@link NonNullableType}, {@link NullableType}, {@link OptionalType} and
+ * {@link RestType}.
+ */
+public abstract class UnaryTypeConstructor extends JSDocTypeExpression {
+	private final JSDocTypeExpression expression;
+	private final boolean prefix;
+	private final String operator;
+
+	public UnaryTypeConstructor(SourceLocation loc, String type, JSDocTypeExpression expression, Boolean prefix, String operator) {
+		super(loc, type);
+		this.expression = expression;
+		this.prefix = prefix == Boolean.TRUE;
+		this.operator = operator;
+	}
+
+	@Override
+	public String pp() {
+		if (expression == null)
+			return operator;
+
+		if (prefix)
+			return operator + expression.pp();
+		else
+			return expression.pp() + operator;
+	}
+
+	/**
+	 * The argument of this type constructor.
+	 */
+	public JSDocTypeExpression getExpression() {
+		return expression;
+	}
+
+	/**
+	 * Is this a prefix type constructor?
+	 */
+	public boolean isPrefix() {
+		return prefix;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/UndefinedLiteral.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UndefinedLiteral.java
new file mode 100644
index 00000000000..a26f114438a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UndefinedLiteral.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * The undefined type.
+ */
+public class UndefinedLiteral extends JSDocTypeExpression {
+	public UndefinedLiteral(SourceLocation loc) {
+		super(loc, "UndefinedLiteral");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	@Override
+	public String pp() {
+		return "undefined";
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnionType.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnionType.java
new file mode 100644
index 00000000000..e6f52785d58
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/UnionType.java
@@ -0,0 +1,24 @@
+package com.semmle.js.ast.jsdoc;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A union type expression.
+ */
+public class UnionType extends CompoundType {
+	public UnionType(SourceLocation loc, List<JSDocTypeExpression> elements) {
+		super("UnionType", loc, elements);
+	}
+
+	@Override
+	public String pp() {
+		return "(" + super.pp("|") + ")";
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/Visitor.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/Visitor.java
new file mode 100644
index 00000000000..e85e711e32a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/Visitor.java
@@ -0,0 +1,26 @@
+package com.semmle.js.ast.jsdoc;
+
+/**
+ * Interface for visitors on {@link JSDocElement}.
+ */
+public interface Visitor {
+	public void visit(AllLiteral nd);
+	public void visit(ArrayType nd);
+	public void visit(JSDocComment nd);
+	public void visit(JSDocTag nd);
+	public void visit(NameExpression nd);
+	public void visit(NullableLiteral nd);
+	public void visit(NullLiteral nd);
+	public void visit(UndefinedLiteral nd);
+	public void visit(VoidLiteral nd);
+	public void visit(UnionType nd);
+	public void visit(TypeApplication nd);
+	public void visit(FunctionType nd);
+	public void visit(NonNullableType nd);
+	public void visit(NullableType nd);
+	public void visit(OptionalType nd);
+	public void visit(RestType nd);
+	public void visit(RecordType nd);
+	public void visit(FieldType nd);
+	public void visit(ParameterType nd);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/VoidLiteral.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/VoidLiteral.java
new file mode 100644
index 00000000000..39959828919
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/VoidLiteral.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.jsdoc;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * The void type.
+ */
+public class VoidLiteral extends JSDocTypeExpression {
+	public VoidLiteral(SourceLocation loc) {
+		super(loc, "VoidLiteral");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	@Override
+	public String pp() {
+		return "void";
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsdoc/package-info.java b/javascript/extractor/src/com/semmle/js/ast/jsdoc/package-info.java
new file mode 100644
index 00000000000..cf90ad4ab0a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsdoc/package-info.java
@@ -0,0 +1,14 @@
+/**
+ * This package contains a Java implementation of the
+ * <a href="https://github.com/Constellation/doctrine">Doctrine AST format</a>.
+ *
+ * <p>
+ * The root of the AST class hierarchy is {@link com.semmle.js.ast.jsdoc.JSDocElement}, which in
+ * turn extends {@link com.semmle.js.ast.SourceElement}.
+ * </p>
+ *
+ * <p>
+ * Nodes accept visitors implementing interface {@link com.semmle.js.ast.jsdoc.Visitor}.
+ * </p>
+ */
+package com.semmle.js.ast.jsdoc;
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/JSONArray.java b/javascript/extractor/src/com/semmle/js/ast/json/JSONArray.java
new file mode 100644
index 00000000000..a62ea8ebe2a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/JSONArray.java
@@ -0,0 +1,42 @@
+package com.semmle.js.ast.json;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A JSON array.
+ */
+public class JSONArray extends JSONValue {
+	private final List<JSONValue> elements;
+
+	public JSONArray(SourceLocation loc, List<JSONValue> elements) {
+		super("Array", loc);
+		this.elements = elements;
+	}
+
+	/**
+	 * The elements of the array.
+	 */
+	public List<JSONValue> getElements() {
+		return elements;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String toString() {
+		StringBuilder res = new StringBuilder("[");
+		String sep = "";
+		for (JSONValue element : elements) {
+			res.append(sep);
+			res.append(element.toString());
+			sep = ", ";
+		}
+		res.append("]");
+		return res.toString();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/JSONLiteral.java b/javascript/extractor/src/com/semmle/js/ast/json/JSONLiteral.java
new file mode 100644
index 00000000000..2edf3db9d15
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/JSONLiteral.java
@@ -0,0 +1,48 @@
+package com.semmle.js.ast.json;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A JSON literal: one of null, true, false, a string, or a number.
+ */
+public class JSONLiteral extends JSONValue {
+	private final Object value;
+	private final String raw;
+
+	public JSONLiteral(SourceLocation loc, Object value) {
+		super("Literal", loc);
+		this.value = value;
+		this.raw = loc.getSource();
+	}
+
+	/**
+	 * The value of the literal.
+	 */
+	public Object getValue() {
+		return value;
+	}
+
+	/**
+	 * The value of the literal as a string.
+	 */
+	public String getStringValue() {
+		return String.valueOf(value);
+	}
+
+	/**
+	 * The source text of the literal.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String toString() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/JSONObject.java b/javascript/extractor/src/com/semmle/js/ast/json/JSONObject.java
new file mode 100644
index 00000000000..f15fd090de3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/JSONObject.java
@@ -0,0 +1,45 @@
+package com.semmle.js.ast.json;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.util.data.Pair;
+
+/**
+ * A JSON object.
+ */
+public class JSONObject extends JSONValue {
+	private final List<Pair<String, JSONValue>> properties;
+
+	public JSONObject(SourceLocation loc, List<Pair<String, JSONValue>> properties) {
+		super("Object", loc);
+		this.properties = properties;
+	}
+
+	/**
+	 * The properties of this object.
+	 */
+	public List<Pair<String, JSONValue>> getProperties() {
+		return properties;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String toString() {
+		StringBuilder res = new StringBuilder("{");
+		String sep = "";
+		for (Pair<String, JSONValue> property : properties) {
+			res.append(sep);
+			res.append(property.fst());
+			res.append(": ");
+			res.append(property.snd());
+			sep = ", ";
+		}
+		res.append("}");
+		return res.toString();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/JSONValue.java b/javascript/extractor/src/com/semmle/js/ast/json/JSONValue.java
new file mode 100644
index 00000000000..a20c2df6eed
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/JSONValue.java
@@ -0,0 +1,28 @@
+package com.semmle.js.ast.json;
+
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass for representing JSON values.
+ */
+public abstract class JSONValue extends SourceElement {
+	private final String type;
+
+	public JSONValue(String type, SourceLocation loc) {
+		super(loc);
+		this.type = type;
+	}
+
+	/**
+	 * The type of the value.
+	 */
+	public String getType() {
+		return type;
+	}
+
+	/**
+	 * Accept a visitor object.
+	 */
+	public abstract <C, R> R accept(Visitor<C, R> v, C c);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/Visitor.java b/javascript/extractor/src/com/semmle/js/ast/json/Visitor.java
new file mode 100644
index 00000000000..6236a68c928
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/Visitor.java
@@ -0,0 +1,12 @@
+package com.semmle.js.ast.json;
+
+/**
+ * Visitor interface for {@link JSONValue}.
+ *
+ * Visit methods take a context argument of type {@link C} and return a result of type {@link R}.
+ */
+public interface Visitor<C, R> {
+	public R visit(JSONObject nd, C c);
+	public R visit(JSONArray nd, C c);
+	public R visit(JSONLiteral nd, C c);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/json/package-info.java b/javascript/extractor/src/com/semmle/js/ast/json/package-info.java
new file mode 100644
index 00000000000..e0996f514ce
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/json/package-info.java
@@ -0,0 +1,13 @@
+/**
+ * This package contains AST classes for representing parsed JSON values.
+ *
+ * <p>
+ * The root of the AST class hierarchy is {@link com.semmle.js.ast.json.JSONValue}, which in
+ * turn extends {@link com.semmle.js.ast.SourceElement}.
+ * </p>
+ *
+ * <p>
+ * Nodes accept visitors implementing interface {@link com.semmle.js.ast.json.Visitor}.
+ * </p>
+ */
+package com.semmle.js.ast.json;
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXAttribute.java b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXAttribute.java
new file mode 100644
index 00000000000..ebc935a42a0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXAttribute.java
@@ -0,0 +1,6 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.INode;
+
+public interface IJSXAttribute extends INode {
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXExpression.java b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXExpression.java
new file mode 100644
index 00000000000..0694ac8ccc3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXExpression.java
@@ -0,0 +1,5 @@
+package com.semmle.js.ast.jsx;
+
+public interface IJSXExpression {
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXName.java b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXName.java
new file mode 100644
index 00000000000..9ee4a115127
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/IJSXName.java
@@ -0,0 +1,7 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.INode;
+
+public interface IJSXName extends INode {
+	public String getQualifiedName();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXAttribute.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXAttribute.java
new file mode 100644
index 00000000000..433510db3c2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXAttribute.java
@@ -0,0 +1,30 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXAttribute extends Node implements IJSXAttribute {
+	private final IJSXName name;
+	private final INode value;
+
+	public JSXAttribute(SourceLocation loc, IJSXName name, INode value) {
+		super("JSXAttribute", loc);
+		this.name = name;
+		this.value = value;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public IJSXName getName() {
+		return name;
+	}
+
+	public INode getValue() {
+		return value;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXBoundaryElement.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXBoundaryElement.java
new file mode 100644
index 00000000000..ae5ad729c6b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXBoundaryElement.java
@@ -0,0 +1,7 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.INode;
+
+public interface JSXBoundaryElement extends INode {
+	public IJSXName getName();
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXClosingElement.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXClosingElement.java
new file mode 100644
index 00000000000..544d7872237
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXClosingElement.java
@@ -0,0 +1,25 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXClosingElement extends Node implements JSXBoundaryElement {
+	private final IJSXName name;
+
+	public JSXClosingElement(SourceLocation loc, IJSXName name) {
+		super("JSXClosingElement", loc);
+		this.name = name;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public IJSXName getName() {
+		return name;
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXElement.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXElement.java
new file mode 100644
index 00000000000..87d3f1fc403
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXElement.java
@@ -0,0 +1,38 @@
+package com.semmle.js.ast.jsx;
+
+import java.util.List;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXElement extends Expression {
+	private final JSXOpeningElement openingElement;
+	private final List<INode> children;
+	private final JSXClosingElement closingElement;
+
+	public JSXElement(SourceLocation loc, JSXOpeningElement openingElement, List<INode> children, JSXClosingElement closingElement) {
+		super("JSXElement", loc);
+		this.openingElement = openingElement;
+		this.children = children;
+		this.closingElement = closingElement;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public JSXOpeningElement getOpeningElement() {
+		return openingElement;
+	}
+
+	public List<INode> getChildren() {
+		return children;
+	}
+
+	public JSXClosingElement getClosingElement() {
+		return closingElement;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXEmptyExpression.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXEmptyExpression.java
new file mode 100644
index 00000000000..7d329a33e09
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXEmptyExpression.java
@@ -0,0 +1,16 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXEmptyExpression extends Node implements IJSXExpression {
+	public JSXEmptyExpression(SourceLocation loc) {
+		super("JSXEmptyExpression", loc);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXExpressionContainer.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXExpressionContainer.java
new file mode 100644
index 00000000000..3254b5eda11
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXExpressionContainer.java
@@ -0,0 +1,24 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXExpressionContainer extends Node implements IJSXExpression {
+	private final INode expression;
+
+	public JSXExpressionContainer(SourceLocation loc, INode expression) {
+		super("JSXExpressionContainer", loc);
+		this.expression = expression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public INode getExpression() {
+		return expression;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXIdentifier.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXIdentifier.java
new file mode 100644
index 00000000000..2ff3b5bc877
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXIdentifier.java
@@ -0,0 +1,21 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXIdentifier extends Identifier implements IJSXName {
+	public JSXIdentifier(SourceLocation loc, String name) {
+		super(loc, name);
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String getQualifiedName() {
+		return getName();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXMemberExpression.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXMemberExpression.java
new file mode 100644
index 00000000000..ba687bdf4bb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXMemberExpression.java
@@ -0,0 +1,34 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXMemberExpression extends Expression implements IJSXName {
+	private final IJSXName object;
+	private final JSXIdentifier property;
+
+	public JSXMemberExpression(SourceLocation loc, IJSXName object, JSXIdentifier property) {
+		super("JSXMemberExpression", loc);
+		this.object = object;
+		this.property = property;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String getQualifiedName() {
+		return object.getQualifiedName() + "." + property.getName();
+	}
+
+	public IJSXName getObject() {
+		return object;
+	}
+
+	public JSXIdentifier getName() {
+		return property;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXNamespacedName.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXNamespacedName.java
new file mode 100644
index 00000000000..a786a5b7c78
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXNamespacedName.java
@@ -0,0 +1,33 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXNamespacedName extends Expression implements IJSXName {
+	private final JSXIdentifier namespace, name;
+
+	public JSXNamespacedName(SourceLocation loc, JSXIdentifier namespace, JSXIdentifier name) {
+		super("JSXNamespacedName", loc);
+		this.namespace = namespace;
+		this.name = name;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public String getQualifiedName() {
+		return namespace.getName() + ":" + name.getName();
+	}
+
+	public JSXIdentifier getNamespace() {
+		return namespace;
+	}
+
+	public JSXIdentifier getName() {
+		return name;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXOpeningElement.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXOpeningElement.java
new file mode 100644
index 00000000000..95d9857f470
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXOpeningElement.java
@@ -0,0 +1,38 @@
+package com.semmle.js.ast.jsx;
+
+import java.util.List;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXOpeningElement extends Node implements JSXBoundaryElement {
+	private final IJSXName name;
+	private final List<IJSXAttribute> attributes;
+	private final boolean selfClosing;
+
+	public JSXOpeningElement(SourceLocation loc, IJSXName name, List<IJSXAttribute> attributes, boolean selfClosing) {
+		super("JSXOpeningElement", loc);
+		this.name = name;
+		this.attributes = attributes;
+		this.selfClosing = selfClosing;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public IJSXName getName() {
+		return name;
+	}
+
+	public List<IJSXAttribute> getAttributes() {
+		return attributes;
+	}
+
+	public boolean isSelfClosing() {
+		return selfClosing;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/jsx/JSXSpreadAttribute.java b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXSpreadAttribute.java
new file mode 100644
index 00000000000..143ccc8db0b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/jsx/JSXSpreadAttribute.java
@@ -0,0 +1,24 @@
+package com.semmle.js.ast.jsx;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class JSXSpreadAttribute extends Node implements IJSXAttribute {
+	private final Expression argument;
+
+	public JSXSpreadAttribute(SourceLocation loc, Expression argument) {
+		super("JSXSpreadAttribute", loc);
+		this.argument = argument;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public Expression getArgument() {
+		return argument;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/package-info.java b/javascript/extractor/src/com/semmle/js/ast/package-info.java
new file mode 100644
index 00000000000..deb9422f3c5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/package-info.java
@@ -0,0 +1,30 @@
+/**
+ * This package contains a Java implementation of the
+ * <a href="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/SpiderMonkey/Parser_API">SpiderMonkey AST format</a>.
+ *
+ * <p>
+ * SpiderMonkey AST node interfaces are represented by Java classes and interfaces with the same
+ * name, plus a few additional abstract classes to improve code reuse. Union types are represented
+ * by additional interfaces.
+ * </p>
+ *
+ * <p>
+ * The root of the AST class hierarchy is {@link com.semmle.js.ast.Node}, which in turn implements
+ * interface {@link com.semmle.js.ast.INode}. Interfaces representing union types also extend that
+ * interface.
+ * </p>
+ *
+ * <p>
+ * Every node has a source location ({@link com.semmle.js.ast.SourceLocation}), comprising a start
+ * and an end position ({@link com.semmle.js.ast.Position}). Since other source elements besides
+ * nodes also have source locations, this association is kept track of by {@link com.semmle.js.ast.SourceElement},
+ * the super class of {@link com.semmle.js.ast.Node}.
+ * </p>
+ *
+ * <p>
+ * Nodes accept visitors implementing interface {@link com.semmle.js.ast.Visitor}. A default
+ * visitor implementation that provides catch-all visit methods for groups of AST node classes
+ * is also provided ({@link com.semmle.js.ast.DefaultVisitor}).
+ * </p>
+ */
+package com.semmle.js.ast;
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/BackReference.java b/javascript/extractor/src/com/semmle/js/ast/regexp/BackReference.java
new file mode 100644
index 00000000000..dbd47e5d647
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/BackReference.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A back reference to a capture group.
+ */
+public class BackReference extends RegExpTerm {
+	private final Long value;
+	private final String raw;
+
+	public BackReference(SourceLocation loc, Double value, String raw) {
+		super(loc, "BackReference");
+		this.value = value.longValue();
+		this.raw = raw;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The number of the capture group referenced.
+	 */
+	public Long getValue() {
+		return value;
+	}
+
+	/**
+	 * The source text of the back reference.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Caret.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Caret.java
new file mode 100644
index 00000000000..072979a4400
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Caret.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A start-of-line assertion.
+ */
+public class Caret extends RegExpTerm {
+	public Caret(SourceLocation loc) {
+		super(loc, "Caret");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClass.java b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClass.java
new file mode 100644
index 00000000000..66c338cc286
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClass.java
@@ -0,0 +1,38 @@
+package com.semmle.js.ast.regexp;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A character class.
+ */
+public class CharacterClass extends RegExpTerm {
+	private final List<RegExpTerm> elements;
+	private final boolean inverted;
+
+	public CharacterClass(SourceLocation loc, List<RegExpTerm> elements, Boolean inverted) {
+		super(loc, "CharacterClass");
+		this.elements = elements;
+		this.inverted = inverted == Boolean.TRUE;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The elements of this character class.
+	 */
+	public List<RegExpTerm> getElements() {
+		return elements;
+	}
+
+	/**
+	 * Is this an inverted character class?
+	 */
+	public boolean isInverted() {
+		return inverted;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassEscape.java
new file mode 100644
index 00000000000..1d6ae5de385
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassEscape.java
@@ -0,0 +1,35 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A shorthand character class escape such as <code>\w</code> or <code>\S</code>.
+ */
+public class CharacterClassEscape extends RegExpTerm {
+	private final String classIdentifier, raw;
+
+	public CharacterClassEscape(SourceLocation loc, String classIdentifier, String raw) {
+		super(loc, "CharacterClassEscape");
+		this.classIdentifier = classIdentifier;
+		this.raw = raw;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The character class identifier.
+	 */
+	public String getClassIdentifier() {
+		return classIdentifier;
+	}
+
+	/**
+	 * The source text of the character class escape.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassRange.java b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassRange.java
new file mode 100644
index 00000000000..9678a7a33ea
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/CharacterClassRange.java
@@ -0,0 +1,35 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A character range in a character class.
+ */
+public class CharacterClassRange extends RegExpTerm {
+	private final RegExpTerm left, right;
+
+	public CharacterClassRange(SourceLocation loc, RegExpTerm left, RegExpTerm right) {
+		super(loc, "CharacterClassRange");
+		this.left = left;
+		this.right = right;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The left hand side of the character range.
+	 */
+	public RegExpTerm getLeft() {
+		return left;
+	}
+
+	/**
+	 * The right hand side of the character range.
+	 */
+	public RegExpTerm getRight() {
+		return right;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Constant.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Constant.java
new file mode 100644
index 00000000000..7b5301aacca
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Constant.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A constant character.
+ */
+public class Constant extends Literal {
+	public Constant(SourceLocation loc, String value) {
+		super(loc, "Constant", value);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ControlEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ControlEscape.java
new file mode 100644
index 00000000000..1c5006c78d0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ControlEscape.java
@@ -0,0 +1,18 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A control character escape.
+ */
+public class ControlEscape extends EscapeSequence {
+	public ControlEscape(SourceLocation loc, String value, Number codepoint, String raw) {
+		super(loc, "ControlEscape", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ControlLetter.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ControlLetter.java
new file mode 100644
index 00000000000..e393ae6f3f4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ControlLetter.java
@@ -0,0 +1,18 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A control letter escape.
+ */
+public class ControlLetter extends EscapeSequence {
+	public ControlLetter(SourceLocation loc, String value, Number codepoint, String raw) {
+		super(loc, "ControlLetter", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/DecimalEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/DecimalEscape.java
new file mode 100644
index 00000000000..0789c9d0217
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/DecimalEscape.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A decimal escape sequence.
+ */
+public class DecimalEscape extends EscapeSequence {
+	public DecimalEscape(SourceLocation loc, String value, Double codepoint, String raw) {
+		super(loc, "DecimalEscape", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Disjunction.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Disjunction.java
new file mode 100644
index 00000000000..c21a4fabde8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Disjunction.java
@@ -0,0 +1,29 @@
+package com.semmle.js.ast.regexp;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A disjunctive pattern.
+ */
+public class Disjunction extends RegExpTerm {
+	private final List<RegExpTerm> disjuncts;
+
+	public Disjunction(SourceLocation loc, List<RegExpTerm> disjuncts) {
+		super(loc, "Disjunction");
+		this.disjuncts = disjuncts;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The individual elements of the disjunction.
+	 */
+	public List<RegExpTerm> getDisjuncts() {
+		return disjuncts;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Dollar.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Dollar.java
new file mode 100644
index 00000000000..484737102b4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Dollar.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An end-of-line assertion.
+ */
+public class Dollar extends RegExpTerm {
+	public Dollar(SourceLocation loc) {
+		super(loc, "Dollar");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Dot.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Dot.java
new file mode 100644
index 00000000000..e55ef5433f8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Dot.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An any-character wildcard.
+ */
+public class Dot extends RegExpTerm {
+	public Dot(SourceLocation loc) {
+		super(loc, "Dot");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Error.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Error.java
new file mode 100644
index 00000000000..b5f56e3d4f6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Error.java
@@ -0,0 +1,23 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An error encountered while parsing a regular expression.
+ */
+public class Error extends SourceElement {
+	private final int code;
+
+	public Error(SourceLocation loc, Number code) {
+		super(loc);
+		this.code = code.intValue();
+	}
+
+	/**
+	 * The error code.
+	 */
+	public int getCode() {
+		return code;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/EscapeSequence.java b/javascript/extractor/src/com/semmle/js/ast/regexp/EscapeSequence.java
new file mode 100644
index 00000000000..6e6259ca8c8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/EscapeSequence.java
@@ -0,0 +1,31 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An escape sequence representing a single character.
+ */
+public abstract class EscapeSequence extends Literal {
+	private final String raw;
+	private final int codepoint;
+
+	public EscapeSequence(SourceLocation loc, String type, String value, Number codepoint, String raw) {
+		super(loc, type, value);
+		this.codepoint = codepoint.intValue();
+		this.raw = raw;
+	}
+
+	/**
+	 * The code point of the represented character.
+	 */
+	public int getCodepoint() {
+		return codepoint;
+	}
+
+	/**
+	 * The source text of the escape sequence.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Group.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Group.java
new file mode 100644
index 00000000000..fd1785f930e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Group.java
@@ -0,0 +1,61 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A parenthesized group in a regular expression.
+ */
+public class Group extends RegExpTerm {
+	private final boolean capture;
+	private final int number;
+	private final String name;
+	private final RegExpTerm operand;
+	
+	public Group(SourceLocation loc, boolean capture, Number number, String name, RegExpTerm operand) {
+		super(loc, "Group");
+		this.capture = capture;
+		this.number = number.intValue();
+		this.name = name;
+		this.operand = operand;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * Is this a capture group?
+	 */
+	public boolean isCapture() {
+		return capture;
+	}
+
+	/**
+	 * Get the index of this group.
+	 */
+	public int getNumber() {
+		return number;
+	}
+
+	/**
+	 * Is this a named captured group?
+	 */
+	public boolean isNamed() {
+		return name != null;
+	}
+
+	/**
+	 * Get the name of this group, if any.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * Get the term inside the group.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/HexEscapeSequence.java b/javascript/extractor/src/com/semmle/js/ast/regexp/HexEscapeSequence.java
new file mode 100644
index 00000000000..3c0a5b2f018
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/HexEscapeSequence.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A hexadecimal character escape sequence.
+ */
+public class HexEscapeSequence extends EscapeSequence {
+	public HexEscapeSequence(SourceLocation loc, String value, Double codepoint, String raw) {
+		super(loc, "HexEscapeSequence", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/IdentityEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/IdentityEscape.java
new file mode 100644
index 00000000000..a93f008efdd
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/IdentityEscape.java
@@ -0,0 +1,18 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An identity escape sequence.
+ */
+public class IdentityEscape extends EscapeSequence {
+	public IdentityEscape(SourceLocation loc, String value, Number codepoint, String raw) {
+		super(loc, "IdentityEscape", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Literal.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Literal.java
new file mode 100644
index 00000000000..03b2014cf4c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Literal.java
@@ -0,0 +1,22 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A regular expression subterm representing a literal string.
+ */
+public abstract class Literal extends RegExpTerm {
+	private final String value;
+
+	public Literal(SourceLocation loc, String type, String value) {
+		super(loc, type);
+		this.value = value;
+	}
+
+	/**
+	 * The represented string.
+	 */
+	public String getValue() {
+		return value;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/NamedBackReference.java b/javascript/extractor/src/com/semmle/js/ast/regexp/NamedBackReference.java
new file mode 100644
index 00000000000..dcd9c21be6b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/NamedBackReference.java
@@ -0,0 +1,36 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A back reference to a named capture group.
+ */
+public class NamedBackReference extends RegExpTerm {
+	private final String name;
+	private final String raw;
+
+	public NamedBackReference(SourceLocation loc, String name, String raw) {
+		super(loc, "NamedBackReference");
+		this.name = name;
+		this.raw = raw;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The name of the capture group referenced.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * The source text of the back reference.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/NonWordBoundary.java b/javascript/extractor/src/com/semmle/js/ast/regexp/NonWordBoundary.java
new file mode 100644
index 00000000000..97102c76c8f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/NonWordBoundary.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A non-word boundary assertion <code>\B</code>.
+ */
+public class NonWordBoundary extends RegExpTerm {
+	public NonWordBoundary(SourceLocation loc) {
+		super(loc, "NonWordBoundary");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/OctalEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/OctalEscape.java
new file mode 100644
index 00000000000..2f08cfacda4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/OctalEscape.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An octal character escape sequence.
+ */
+public class OctalEscape extends EscapeSequence {
+	public OctalEscape(SourceLocation loc, String value, Double codepoint, String raw) {
+		super(loc, "OctalEscape", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Opt.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Opt.java
new file mode 100644
index 00000000000..4c964a524c5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Opt.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An optional quantifier such as <code>s?</code>.
+ */
+public class Opt extends Quantifier {
+	public Opt(SourceLocation loc, RegExpTerm operand, Boolean greedy) {
+		super(loc, "Opt", operand, greedy);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Plus.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Plus.java
new file mode 100644
index 00000000000..39567899bad
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Plus.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A non-empty repetition quantifier such as <code>a+</code>.
+ */
+public class Plus extends Quantifier {
+	public Plus(SourceLocation loc, RegExpTerm operand, Boolean greedy) {
+		super(loc, "Plus", operand, greedy);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Quantifier.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Quantifier.java
new file mode 100644
index 00000000000..414fc94d888
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Quantifier.java
@@ -0,0 +1,31 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A quantifier, that is, one of {@link Opt}, {@link Plus}, {@link Star} or {@link Range}.
+ */
+public abstract class Quantifier extends RegExpTerm {
+	private final RegExpTerm operand;
+	private final boolean greedy;
+
+	public Quantifier(SourceLocation loc, String type, RegExpTerm operand, Boolean greedy) {
+		super(loc, type);
+		this.operand = operand;
+		this.greedy = greedy == Boolean.TRUE;
+	}
+
+	/**
+	 * The quantified term.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+
+	/**
+	 * Is this a greedy quantifier?
+	 */
+	public boolean isGreedy() {
+		return greedy;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Range.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Range.java
new file mode 100644
index 00000000000..b958ae615d5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Range.java
@@ -0,0 +1,42 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A range quantifier.
+ */
+public class Range extends Quantifier {
+	private final Long lowerBound, upperBound;
+
+	public Range(SourceLocation loc, RegExpTerm operand, Boolean greedy, Double lo, Double hi) {
+		super(loc, "Range", operand, greedy);
+		this.lowerBound = lo.longValue();
+		this.upperBound = hi == null ? null : hi.longValue();
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * Get the lower bound of this quantifier.
+	 */
+	public Long getLowerBound() {
+		return lowerBound;
+	}
+
+	/**
+	 * Does this range quantifier have an upper bound?
+	 */
+	public boolean hasUpperBound() {
+		return upperBound != null;
+	}
+
+	/**
+	 * The upper bound of this quantifier; may be null.
+	 */
+	public Long getUpperBound() {
+		return upperBound;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/RegExpTerm.java b/javascript/extractor/src/com/semmle/js/ast/regexp/RegExpTerm.java
new file mode 100644
index 00000000000..bf9cb31eb4a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/RegExpTerm.java
@@ -0,0 +1,28 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * Common superclass of all regular expression AST nodes.
+ */
+public abstract class RegExpTerm extends SourceElement {
+	private final String type;
+
+	public RegExpTerm(SourceLocation loc, String type) {
+		super(loc);
+		this.type = type;
+	}
+
+	/**
+	 * Accept a visitor object.
+	 */
+	public abstract void accept(Visitor v);
+
+	/**
+	 * The type of this regular expression AST node.
+	 */
+	public String getType() {
+		return type;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Sequence.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Sequence.java
new file mode 100644
index 00000000000..f6ce79b3bae
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Sequence.java
@@ -0,0 +1,29 @@
+package com.semmle.js.ast.regexp;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A sequence of regular expression terms.
+ */
+public class Sequence extends RegExpTerm {
+	private final List<RegExpTerm> elements;
+
+	public Sequence(SourceLocation loc, List<RegExpTerm> elements) {
+		super(loc, "Sequence");
+		this.elements = elements;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The individual elements of this sequence.
+	 */
+	public List<RegExpTerm> getElements() {
+		return elements;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Star.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Star.java
new file mode 100644
index 00000000000..6130f71b742
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Star.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A possibly empty repetition.
+ */
+public class Star extends Quantifier {
+	public Star(SourceLocation loc, RegExpTerm operand, Boolean greedy) {
+		super(loc, "Star", operand, greedy);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodeEscapeSequence.java b/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodeEscapeSequence.java
new file mode 100644
index 00000000000..e6675fad29f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodeEscapeSequence.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A Unicode escape sequence.
+ */
+public class UnicodeEscapeSequence extends EscapeSequence {
+	public UnicodeEscapeSequence(SourceLocation loc, String value, Double codepoint, String raw) {
+		super(loc, "UnicodeEscapeSequence", value, codepoint, raw);
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodePropertyEscape.java b/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodePropertyEscape.java
new file mode 100644
index 00000000000..e1264655fa6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/UnicodePropertyEscape.java
@@ -0,0 +1,50 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A Unicode property escape such as <code>\p{Number}</code> or <code>\p{Script=Greek}</code>.
+ */
+public class UnicodePropertyEscape extends RegExpTerm {
+	private final String name, value, raw;
+
+	public UnicodePropertyEscape(SourceLocation loc, String name, String value, String raw) {
+		super(loc, "UnicodePropertyEscape");
+		this.name = name;
+		this.value = value;
+		this.raw = raw;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The name of the property.
+	 */
+	public String getName() {
+		return name;
+	}
+
+	/**
+	 * Does this property have a value?
+	 */
+	public boolean hasValue() {
+		return value != null;
+	}
+
+	/**
+	 * The value of the property if any.
+	 */
+	public String getValue() {
+		return value;
+	}
+
+	/**
+	 * The source text of the Unicode property escape.
+	 */
+	public String getRaw() {
+		return raw;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/Visitor.java b/javascript/extractor/src/com/semmle/js/ast/regexp/Visitor.java
new file mode 100644
index 00000000000..5b0a4e407c4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/Visitor.java
@@ -0,0 +1,37 @@
+package com.semmle.js.ast.regexp;
+
+/**
+ * Visitor interface for {@link RegExpTerm}.
+ */
+public interface Visitor {
+	public void visit(Caret nd);
+	public void visit(Constant nd);
+	public void visit(Dollar nd);
+	public void visit(Group nd);
+	public void visit(NonWordBoundary nd);
+	public void visit(Opt nd);
+	public void visit(Plus nd);
+	public void visit(Range nd);
+	public void visit(Sequence nd);
+	public void visit(Star nd);
+	public void visit(WordBoundary nd);
+	public void visit(Disjunction nd);
+	public void visit(ZeroWidthPositiveLookahead nd);
+	public void visit(ZeroWidthNegativeLookahead nd);
+	public void visit(Dot nd);
+	public void visit(DecimalEscape nd);
+	public void visit(HexEscapeSequence nd);
+	public void visit(OctalEscape nd);
+	public void visit(UnicodeEscapeSequence nd);
+	public void visit(BackReference nd);
+	public void visit(ControlEscape nd);
+	public void visit(IdentityEscape nd);
+	public void visit(ControlLetter nd);
+	public void visit(CharacterClassEscape nd);
+	public void visit(CharacterClass nd);
+	public void visit(CharacterClassRange nd);
+	public void visit(NamedBackReference nd);
+	public void visit(ZeroWidthPositiveLookbehind nd);
+	public void visit(ZeroWidthNegativeLookbehind nd);
+	public void visit(UnicodePropertyEscape nd);
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/WordBoundary.java b/javascript/extractor/src/com/semmle/js/ast/regexp/WordBoundary.java
new file mode 100644
index 00000000000..cc67f6e2160
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/WordBoundary.java
@@ -0,0 +1,17 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A word-boundary assertion <code>\b</code>.
+ */
+public class WordBoundary extends RegExpTerm {
+	public WordBoundary(SourceLocation loc) {
+		super(loc, "WordBoundary");
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookahead.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookahead.java
new file mode 100644
index 00000000000..695d0475575
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookahead.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A zero-width negative lookahead assertion of the form <code>(?!p)</code>.
+ */
+public class ZeroWidthNegativeLookahead extends RegExpTerm {
+	private final RegExpTerm operand;
+	
+	public ZeroWidthNegativeLookahead(SourceLocation loc, RegExpTerm operand) {
+		super(loc, "ZeroWidthNegativeLookahead");
+		this.operand = operand;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The operand of this negative lookahead assertion.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookbehind.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookbehind.java
new file mode 100644
index 00000000000..be224241837
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthNegativeLookbehind.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A zero-width negative lookbehind assertion of the form <code>(?&lt;!p)</code>.
+ */
+public class ZeroWidthNegativeLookbehind extends RegExpTerm {
+	private final RegExpTerm operand;
+	
+	public ZeroWidthNegativeLookbehind(SourceLocation loc, RegExpTerm operand) {
+		super(loc, "ZeroWidthNegativeLookbehind");
+		this.operand = operand;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The operand of this negative lookbehind assertion.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookahead.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookahead.java
new file mode 100644
index 00000000000..d6245023ccb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookahead.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A zero-width positive lookahead assertion of the form <code>(?=p)</code>.
+ */
+public class ZeroWidthPositiveLookahead extends RegExpTerm {
+	private final RegExpTerm operand;
+	
+	public ZeroWidthPositiveLookahead(SourceLocation loc, RegExpTerm operand) {
+		super(loc, "ZeroWidthPositiveLookahead");
+		this.operand = operand;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The operand of this negative lookahead assertion.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookbehind.java b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookbehind.java
new file mode 100644
index 00000000000..3bec9513a63
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/ZeroWidthPositiveLookbehind.java
@@ -0,0 +1,27 @@
+package com.semmle.js.ast.regexp;
+
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * A zero-width positive lookbehind assertion of the form <code>(?&lt;=p)</code>.
+ */
+public class ZeroWidthPositiveLookbehind extends RegExpTerm {
+	private final RegExpTerm operand;
+	
+	public ZeroWidthPositiveLookbehind(SourceLocation loc, RegExpTerm operand) {
+		super(loc, "ZeroWidthPositiveLookbehind");
+		this.operand = operand;
+	}
+
+	@Override
+	public void accept(Visitor v) {
+		v.visit(this);
+	}
+
+	/**
+	 * The operand of this negative lookbehind assertion.
+	 */
+	public RegExpTerm getOperand() {
+		return operand;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/ast/regexp/package-info.java b/javascript/extractor/src/com/semmle/js/ast/regexp/package-info.java
new file mode 100644
index 00000000000..7930aeb57f7
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/ast/regexp/package-info.java
@@ -0,0 +1,14 @@
+/**
+ * This package contains a Java implementation of the
+ * esregex AST format.
+ *
+ * <p>
+ * The root of the AST class hierarchy is {@link com.semmle.js.ast.regexp.RegExpTerm}, which in
+ * turn extends {@link com.semmle.js.ast.SourceElement}.
+ * </p>
+ *
+ * <p>
+ * Nodes accept visitors implementing interface {@link com.semmle.js.ast.regexp.Visitor}.
+ * </p>
+ */
+package com.semmle.js.ast.regexp;
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java
new file mode 100644
index 00000000000..db1cd18d94d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ASTExtractor.java
@@ -0,0 +1,1878 @@
+package com.semmle.js.extractor;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.Stack;
+
+import com.semmle.js.ast.AClass;
+import com.semmle.js.ast.AFunction;
+import com.semmle.js.ast.AFunctionExpression;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.ArrowFunctionExpression;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.AwaitExpression;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.BindExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.ComprehensionBlock;
+import com.semmle.js.ast.ComprehensionExpression;
+import com.semmle.js.ast.ConditionalExpression;
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.DynamicImport;
+import com.semmle.js.ast.EnhancedForStatement;
+import com.semmle.js.ast.ExportAllDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.FieldDefinition;
+import com.semmle.js.ast.ForOfStatement;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.FunctionExpression;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IPattern;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportNamespaceSpecifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.InvokeExpression;
+import com.semmle.js.ast.JumpStatement;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.LetExpression;
+import com.semmle.js.ast.LetStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.LogicalExpression;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.DeclarationFlags;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.MethodDefinition;
+import com.semmle.js.ast.MethodDefinition.Kind;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectExpression;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.RestElement;
+import com.semmle.js.ast.ReturnStatement;
+import com.semmle.js.ast.SequenceExpression;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Super;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TaggedTemplateExpression;
+import com.semmle.js.ast.TemplateElement;
+import com.semmle.js.ast.TemplateLiteral;
+import com.semmle.js.ast.ThrowStatement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.ast.YieldExpression;
+import com.semmle.js.ast.jsx.IJSXName;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.js.extractor.ExtractorConfig.Platform;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.extractor.ScopeManager.DeclKind;
+import com.semmle.js.extractor.ScopeManager.Scope;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportAsNamespaceDeclaration;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.GlobalAugmentationDeclaration;
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypedAstNode;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.ts.ast.TypeExpression;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+import com.semmle.util.collections.CollectionUtil;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for AST-based information; invoked by the {@link JSExtractor}.
+ */
+public class ASTExtractor {
+	private final TrapWriter trapwriter;
+	private final LocationManager locationManager;
+	private final SyntacticContextManager contextManager;
+	private final ScopeManager scopeManager;
+	private final Label toplevelLabel;
+	private final LexicalExtractor lexicalExtractor;
+	private final RegExpExtractor regexpExtractor;
+
+	public ASTExtractor(LexicalExtractor lexicalExtractor, ScopeManager scopeManager) {
+		this.trapwriter = lexicalExtractor.getTrapwriter();
+		this.locationManager = lexicalExtractor.getLocationManager();
+		this.contextManager = new SyntacticContextManager();
+		this.scopeManager = scopeManager;
+		this.lexicalExtractor = lexicalExtractor;
+		this.regexpExtractor = new RegExpExtractor(trapwriter, locationManager);
+		this.toplevelLabel = trapwriter.globalID("script;{" + locationManager.getFileLabel() + "}," + locationManager.getStartLine() + ',' + locationManager.getStartColumn());
+	}
+
+	public TrapWriter getTrapwriter() {
+		return trapwriter;
+	}
+
+	public LocationManager getLocationManager() {
+		return locationManager;
+	}
+
+	public Label getToplevelLabel() {
+		return toplevelLabel;
+	}
+
+	public ScopeManager getScopeManager() {
+		return scopeManager;
+	}
+
+	/**
+	 * The binding semantics for an identifier.
+	 *
+	 * An identifier is either a label, or declares or binds to a variable or type.
+	 */
+	public enum IdContext {
+		/** An identifier that binds to a variable. */
+		varBind,
+
+		/** An identifier that declares a variable. */
+		varDecl,
+
+		/** An identifier that declares both a variable and a type. */
+		varAndTypeDecl,
+
+		/**
+		 * An identifier that is not associated with variables or types, such as a
+		 * property name and statement label.
+		 */
+		label,
+
+		/** An identifier that binds to a type (and not a variable). */
+		typeBind,
+
+		/** An identifier that declares a type (and not a variable). */
+		typeDecl,
+
+		/**
+		 * An identifier that is part of a type, but should not bind to a type name.
+		 * Unlike {@link #label}, this will not result in an expression.
+		 */
+		typeLabel,
+
+		/**
+		 * An identifier that refers to a variable from inside a type, i.e. the operand
+		 * to a <tt>typeof</tt> type or left operand to an <tt>is</tt> type.
+		 *
+		 * This is generally treated as a type, except a variable binding will be
+		 * emitted for it.
+		 */
+		varInTypeBind,
+
+		/**
+		 * An identifier that refers to a namespace from inside a type.
+		 */
+		namespaceBind,
+
+		/**
+		 * An identifier that declares a namespace.
+		 */
+		namespaceDecl,
+
+		/**
+		 * An identifier that declares a variable and a namespace.
+		 */
+		varAndNamespaceDecl,
+
+		/**
+		 * An identifier that declares a variable, type, and namepsace.
+		 */
+		varAndTypeAndNamespaceDecl,
+
+		/**
+		 * An identifier that occurs as part of a named export, such as
+		 * <tt>export { A }</tt>.
+		 * <p>
+		 * This may refer to a variable, type, and/or a namespace, and will export
+		 * exactly those that can be resolved.
+		 * <p>
+		 * In this case, the identifier is not implicitly resolved to a global unless
+		 * the global is explicitly declared, since TypeScript only emits the export
+		 * code when it refers to a declared variable.
+		 */
+		export,
+
+		/**
+		 * An identifier that occurs as a qualified name in a default export expression,
+		 * such as <tt>A</tt> in <tt>export default A.B</tt>.
+		 * <p>
+		 * This acts like {@link #export}, except it cannot refer to a type (i.e. it
+		 * must be a variable and/or a namespace).
+		 */
+		exportBase;
+
+		/**
+		 * True if this occurs as part of a type annotation, i.e. it is
+		 * {@link #typeBind} or {@link #typeDecl}, {@link #typeLabel},
+		 * {@link #varInTypeBind}, or {@link #namespaceBind}.
+		 * <p>
+		 * Does not hold for {@link #varAndTypeDecl}.
+		 */
+		public boolean isInsideType() {
+			return this == typeBind || this == typeDecl || this == typeLabel || this == varInTypeBind || this == namespaceBind;
+		}
+	};
+
+	private static class Context {
+		private final Label parent;
+		private final int childIndex;
+		private final IdContext idcontext;
+
+		public Context(Label parent, int childIndex, IdContext idcontext) {
+			this.parent = parent;
+			this.childIndex = childIndex;
+			this.idcontext = idcontext;
+		}
+
+		/** True if the visited AST node occurs as part of a type annotation. */
+		public boolean isInsideType() {
+			return idcontext.isInsideType();
+		}
+	}
+
+	private class V extends DefaultVisitor<Context, Label> {
+		private final Platform platform;
+		private final SourceType sourceType;
+		private boolean isStrict;
+
+		public V(Platform platform, SourceType sourceType) {
+			this.platform = platform;
+			this.sourceType = sourceType;
+			this.isStrict = sourceType == SourceType.MODULE;
+		}
+
+		private Label visit(INode child, Label parent, int childIndex) {
+			return visit(child, parent, childIndex, IdContext.varBind);
+		}
+
+		private Label visitAll(List<? extends INode> children, Label parent) {
+			return visitAll(children, parent, IdContext.varBind, 0);
+		}
+
+		private Label visit(INode child, Label parent, int childIndex, IdContext idContext) {
+			if (child == null)
+				return null;
+			return child.accept(this, new Context(parent, childIndex, idContext));
+		}
+
+		private Label visitAll(List<? extends INode> children, Label parent, IdContext idContext, int index) {
+			return visitAll(children, parent, idContext, index, 1);
+		}
+
+		private Label visitAll(List<? extends INode> children, Label parent, IdContext idContext, int index, int step) {
+			Label res = null;
+			for (INode child : children) {
+				res = visit(child, parent, index, idContext);
+				index += step;
+			}
+			return res;
+		}
+
+		@Override
+		public Label visit(Expression nd, Context c) {
+			int kind = c.isInsideType()
+					? TypeExprKinds.getTypeExprKind(nd, c.idcontext)
+					: ExprKinds.getExprKind(nd, c.idcontext);
+			Label lbl = visit(nd, kind, c);
+			emitStaticType(nd, lbl);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(TypeExpression nd, Context c) {
+			Label lbl = visit(nd, TypeExprKinds.getTypeExprKind(nd, c.idcontext), c);
+			emitStaticType(nd, lbl);
+			return lbl;
+		}
+
+		private void emitStaticType(ITypedAstNode nd, Label lbl) {
+			if (nd.getStaticTypeId() != -1) {
+				trapwriter.addTuple("ast_node_type", lbl, trapwriter.globalID("type;" + nd.getStaticTypeId()));
+			}
+		}
+
+		private Label visit(SourceElement nd, int kind, Context c) {
+			return visit(nd, kind, lexicalExtractor.mkToString(nd), c);
+		}
+
+		protected Label visit(SourceElement nd, int kind, String tostring,
+				Context c) {
+			Label lbl = trapwriter.localID(nd);
+			if (c.isInsideType()) {
+				trapwriter.addTuple("typeexprs", lbl, kind, c.parent, c.childIndex, tostring);
+			} else {
+				trapwriter.addTuple("exprs", lbl, kind, c.parent, c.childIndex, tostring);
+			}
+			if (nd.hasLoc())
+				locationManager.emitNodeLocation(nd, lbl);
+			Statement enclosingStmt = contextManager.getCurrentStatement();
+			if (enclosingStmt != null)
+				trapwriter.addTuple("enclosingStmt", lbl, trapwriter.localID(enclosingStmt));
+			trapwriter.addTuple("exprContainers", lbl, contextManager.getCurrentContainerKey());
+			return lbl;
+		}
+
+		@Override
+		public Label visit(Statement nd, Context c) {
+			Label lbl = trapwriter.localID(nd);
+			int kind = StmtKinds.getStmtKind(nd);
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("stmts", lbl, kind, c.parent, c.childIndex, tostring);
+			locationManager.emitNodeLocation(nd, lbl);
+			trapwriter.addTuple("stmtContainers", lbl, contextManager.getCurrentContainerKey());
+			contextManager.setCurrentStatement(nd);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(InvokeExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getCallee(), key, -1);
+			visitAll(nd.getTypeArguments(), key, IdContext.typeBind, -2, -1);
+			visitAll(nd.getArguments(), key);
+			if (nd.getResolvedSignatureId() != -1) {
+				Label signature = trapwriter.globalID("signature;" + nd.getResolvedSignatureId());
+				trapwriter.addTuple("invoke_expr_signature", key, signature);
+			}
+			if (nd.getOverloadIndex() != -1) {
+				trapwriter.addTuple("invoke_expr_overload_index", key, nd.getOverloadIndex());
+			}
+			emitNodeSymbol(nd, key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ExpressionStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			return visit(nd.getExpression(), key, 0);
+		}
+
+		private void addVariableBinding(String relation, Label key, String name) {
+			Label variableKey = scopeManager.getVarKey(name);
+			trapwriter.addTuple(relation, key, variableKey);
+		}
+
+		private boolean addTypeBinding(String relation, Label key, String name) {
+			// Type bindings do not implicitly resolve to a global - they are null if unresolved.
+			Label typenameKey = scopeManager.getTypeKey(name);
+			if (typenameKey != null) {
+				trapwriter.addTuple(relation, key, typenameKey);
+				return true;
+			}
+			return false;
+		}
+
+		private boolean addNamespaceBinding(String relation, Label key, String name) {
+			// Namespace bindings do not implicitly resolve to a global - they are null if
+			// unresolved.
+			Label typenameKey = scopeManager.getNamespaceKey(name);
+			if (typenameKey != null) {
+				trapwriter.addTuple(relation, key, typenameKey);
+				return true;
+			}
+			return false;
+		}
+
+		@Override
+		public Label visit(Identifier nd, Context c) {
+			Label key = super.visit(nd, c);
+			String name = nd.getName();
+			emitNodeSymbol(nd, key);
+			trapwriter.addTuple("literals", name, name, key);
+			switch (c.idcontext) {
+			case varBind:
+			case varInTypeBind:
+				addVariableBinding("bind", key, name);
+				break;
+			case varDecl:
+				addVariableBinding("decl", key, name);
+				break;
+			case varAndTypeDecl:
+				addVariableBinding("decl", key, name);
+				addTypeBinding("typedecl", key, name);
+				break;
+			case typeBind:
+				addTypeBinding("typebind", key, name);
+				break;
+			case typeDecl:
+				addTypeBinding("typedecl", key, name);
+				break;
+			case namespaceBind:
+				addNamespaceBinding("namespacebind", key, name);
+				break;
+			case namespaceDecl:
+				addNamespaceBinding("namespacedecl", key, name);
+				break;
+			case varAndNamespaceDecl:
+				addVariableBinding("decl", key, name);
+				addNamespaceBinding("namespacedecl", key, name);
+				break;
+			case varAndTypeAndNamespaceDecl:
+				addVariableBinding("decl", key, name);
+				addTypeBinding("typedecl", key, name);
+				addNamespaceBinding("namespacedecl", key, name);
+				break;
+			case export:
+			case exportBase:
+				// At the time of writing, this kind of export is only allowed at the top-level.
+				boolean resolved = false;
+				if (c.idcontext != IdContext.exportBase) {
+					resolved |= addTypeBinding("typebind", key, name);
+				}
+				resolved |= addNamespaceBinding("namespacebind", key, name);
+				if (scopeManager.isStrictlyInScope(name) || !resolved) {
+					// Do not reference implicit globals, unless nothing else is in scope.
+					addVariableBinding("bind", key, name);
+				}
+				break;
+			case label:
+			case typeLabel:
+				break;
+			}
+			return key;
+		}
+
+		@Override
+		public Label visit(Literal nd, Context c) {
+			Label key = super.visit(nd, c);
+			String source = nd.getLoc().getSource();
+			String valueString = nd.getStringValue();
+
+			trapwriter.addTuple("literals", valueString, source, key);
+			if (nd.isRegExp())
+				regexpExtractor.extract(source.substring(1, source.lastIndexOf('/')), nd);
+			return key;
+		}
+
+		@Override
+		public Label visit(MemberExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			if (c.isInsideType()) {
+				emitNodeSymbol(nd, key);
+
+				// The context can either be typeBind, namespaceBind, or varInTypeBind.
+				IdContext baseIdContext = c.idcontext == IdContext.varInTypeBind ? IdContext.varInTypeBind : IdContext.namespaceBind;
+				visit(nd.getObject(), key, 0, baseIdContext);
+
+				// Ensure the property name is not a TypeAccess, since this would create two
+				// TypeAccesses from the same type usage, easily leading to duplicate query
+				// results. The qualified access is the one we prefer to select.
+				visit(nd.getProperty(), key, 1, IdContext.typeLabel);
+			} else {
+				IdContext baseIdContext = c.idcontext == IdContext.export ? IdContext.exportBase : IdContext.varBind;
+				visit(nd.getObject(), key, 0, baseIdContext);
+				visit(nd.getProperty(), key, 1, nd.isComputed() ? IdContext.varBind : IdContext.label);
+			}
+			return key;
+		}
+
+		@Override
+		public Label visit(Program nd, Context c) {
+			contextManager.enterContainer(toplevelLabel);
+
+			isStrict = hasUseStrict(nd.getBody());
+
+			// if we're extracting a Node.js/ES2015 module, introduce module scope
+			if (platform == Platform.NODE) {
+				// add node.js-specific globals
+				scopeManager.addVariables("global", "process", "console", "Buffer");
+
+				Label moduleScopeKey = trapwriter.globalID("module;{" + locationManager.getFileLabel() + "}," + locationManager.getStartLine() + "," + locationManager.getStartColumn());
+				scopeManager.enterScope(3, moduleScopeKey, toplevelLabel);
+				// special variables aren't available in `.mjs` modules
+				if (!".mjs".equals(locationManager.getSourceFileExtension()))
+					scopeManager.addVariables("require", "module", "exports", "__filename", "__dirname", "arguments");
+				trapwriter.addTuple("isModule", toplevelLabel);
+			} else if (sourceType == SourceType.MODULE) {
+				Label moduleScopeKey = trapwriter.globalID("module;{" + locationManager.getFileLabel() + "}," + locationManager.getStartLine() + "," + locationManager.getStartColumn());
+				scopeManager.enterScope(3, moduleScopeKey, toplevelLabel);
+				trapwriter.addTuple("isModule", toplevelLabel);
+			}
+
+			// add all declared global (or module-scoped) names, both non-lexical and lexical
+			scopeManager.addNames(scopeManager.collectDeclaredNames(nd, isStrict, false, DeclKind.none));
+			scopeManager.addNames(scopeManager.collectDeclaredNames(nd, isStrict, true, DeclKind.none));
+
+			visitAll(nd.getBody(), toplevelLabel);
+
+			// if we're extracting a Node.js/ES2015 module, leave its scope
+			if (platform == Platform.NODE || sourceType == SourceType.MODULE)
+				scopeManager.leaveScope();
+
+			contextManager.leaveContainer();
+
+			emitNodeSymbol(nd, toplevelLabel);
+
+			return toplevelLabel;
+		}
+
+		/**
+		 * Is the first statement of {@code body} a strict mode declaration?
+		 */
+		private boolean hasUseStrict(List<Statement> body) {
+			if (!body.isEmpty()) {
+				Statement firstStmt = body.get(0);
+				if (firstStmt instanceof ExpressionStatement) {
+					Expression e = ((ExpressionStatement) firstStmt).getExpression();
+					if (e instanceof Literal) {
+						String r = ((Literal) e).getRaw();
+						return "'use strict'".equals(r) || "\"use strict\"".equals(r);
+					}
+				}
+			}
+			return false;
+		}
+
+		@Override
+		public Label visit(AssignmentExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLeft(), key, 0);
+			visit(nd.getRight(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(BinaryExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLeft(), key, 0);
+			visit(nd.getRight(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(ComprehensionBlock nd, Context c) {
+			Label key = super.visit(nd, c);
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(nd.getLeft(), isStrict, true, DeclKind.var);
+			scopeManager.enterScope(nd);
+			scopeManager.addNames(lexicals);
+			visit(nd.getLeft(), key, 0, IdContext.varDecl);
+			visit(nd.getRight(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(ComprehensionExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getBlocks(), key, IdContext.varBind, 1);
+			visit(nd.getFilter(), key, -1);
+			visit(nd.getBody(), key, 0);
+			for (int i=nd.getBlocks().size(); i>0; --i)
+				scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(LogicalExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLeft(), key, 0);
+			visit(nd.getRight(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(UnaryExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(SpreadElement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(UpdateExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(YieldExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0);
+			if (nd.isDelegating())
+				trapwriter.addTuple("isDelegating", key);
+			return key;
+		}
+
+		/*
+		 * Caveat: If you change this method, check whether you also need to change the
+		 * handling of for loops with let-bound loop variables above.
+		 */
+		@Override
+		public Label visit(VariableDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			if (nd.hasDeclareKeyword()) {
+				trapwriter.addTuple("hasDeclareKeyword", key);
+			}
+			visitAll(nd.getDeclarations(), key);
+			return key;
+		}
+
+		@Override
+		public Label visit(LetStatement nd, Context c) {
+			return extractLet(nd, super.visit(nd, c), nd.getHead(), nd.getBody());
+		}
+
+		@Override
+		public Label visit(LetExpression nd, Context c) {
+			return extractLet(nd, super.visit(nd, c), nd.getHead(), nd.getBody());
+		}
+
+		private Label extractLet(Node nd, Label key, List<VariableDeclarator> head, Node body) {
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(head, isStrict, true, DeclKind.var);
+			scopeManager.enterScope(nd);
+			scopeManager.addNames(lexicals);
+			visitAll(head, key);
+			visit(body, key, -1, IdContext.varBind);
+			scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(VariableDeclarator nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getId(), key, 0, IdContext.varDecl);
+			visit(nd.getInit(), key, 1);
+			visit(nd.getTypeAnnotation(), key, 2, IdContext.typeBind);
+			for (int i = 0; i < DeclarationFlags.numberOfFlags; ++i) {
+				if (DeclarationFlags.hasNthFlag(nd.getFlags(), i)) {
+					trapwriter.addTuple(DeclarationFlags.relationNames.get(i), key);
+				}
+			}
+			return key;
+		}
+
+		@Override
+		public Label visit(BlockStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, true, DeclKind.none);
+			if (!lexicals.isEmpty()) {
+				scopeManager.enterScope(nd);
+				scopeManager.addNames(lexicals);
+			}
+			visitAll(nd.getBody(), key);
+			if (!lexicals.isEmpty())
+				scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(FunctionDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			if (nd.hasDeclareKeyword()) {
+				trapwriter.addTuple("hasDeclareKeyword", key);
+			}
+			extractFunction(nd, key);
+			return key;
+		}
+
+		private void extractFunctionAttributes(IFunction nd, Label key) {
+			if (nd.isGenerator())
+				trapwriter.addTuple("isGenerator", key);
+			if (nd.hasRest())
+				trapwriter.addTuple("hasRestParameter", key);
+			if (nd.isAsync())
+				trapwriter.addTuple("isAsync", key);
+		}
+
+		@Override
+		public Label visit(AFunctionExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			extractFunction(nd, key);
+			return key;
+		}
+
+		private void extractFunction(IFunction nd, Label key) {
+			// If the function has no body we process it like any other function, it
+			// just won't contain any statements.
+			contextManager.enterContainer(key);
+
+			boolean bodyIsStrict = isStrict;
+			if (!isStrict && nd.getBody() instanceof BlockStatement)
+				bodyIsStrict = hasUseStrict(((BlockStatement) nd.getBody()).getBody());
+
+			// The name of a function declaration binds to the outer scope.
+			if (nd instanceof FunctionDeclaration) {
+				visit(nd.getId(), key, -1, IdContext.varDecl);
+			}
+
+			DeclaredNames locals = scopeManager.collectDeclaredNames(nd.getBody(), bodyIsStrict, false, DeclKind.none);
+
+			scopeManager.enterScope((Node) nd);
+			scopeManager.addNames(locals);
+
+			// The name of a function expression binds to its own scope.
+			if (nd.getId() != null && nd instanceof AFunctionExpression) {
+				scopeManager.addVariables(nd.getId().getName());
+				visit(nd.getId(), key, -1, IdContext.varDecl);
+			}
+
+			for (TypeParameter tp : nd.getTypeParameters()) {
+				scopeManager.addTypeName(tp.getId().getName());
+			}
+
+			int i = 0;
+			for (IPattern param : nd.getAllParams()) {
+				scopeManager.addNames(scopeManager.collectDeclaredNames(param, isStrict, false, DeclKind.var));
+				visit(param, key, i, IdContext.varDecl);
+				++i;
+			}
+
+			// add 'arguments' object unless this is an arrow function
+			if (!(nd instanceof ArrowFunctionExpression)) {
+				if (!scopeManager.declaredInCurrentScope("arguments"))
+					scopeManager.addVariables("arguments");
+				trapwriter.addTuple("isArgumentsObject", scopeManager.getVarKey("arguments"));
+			}
+
+			// add return type at index -3
+			visit(nd.getReturnType(), key, -3, IdContext.typeBind);
+
+			// add 'this' type at index -4
+			visit(nd.getThisParameterType(), key, -4, IdContext.typeBind);
+
+			// add parameter stuff at index -5 and down
+			extractParameterDefaultsAndTypes(nd, key, i);
+
+			extractFunctionAttributes(nd, key);
+			emitNodeSymbol(nd, key);
+
+			boolean oldIsStrict = isStrict;
+			isStrict = bodyIsStrict;
+			this.visit(nd.getBody(), key, -2);
+			isStrict = oldIsStrict;
+
+			contextManager.leaveContainer();
+			scopeManager.leaveScope();
+			lexicalExtractor.emitNumlines(key, nd.getLoc().getStart(), nd.getLoc().getEnd());
+		}
+
+		private void extractParameterDefaultsAndTypes(IFunction nd, Label key, int paramCount) {
+			for (int j=0; j<paramCount; ++j) {
+				// parameter defaults are populated at indices -5, -9, ...
+				if (nd.hasDefault(j))
+					this.visit(nd.getDefault(j), key, -(4 * j + 5));
+				// parameter type annotations are populated at indices -6, -10, ...
+				if (nd.hasParameterType(j))
+					this.visit(nd.getParameterType(j), key, -(4 * j + 6), IdContext.typeBind);
+			}
+			// type parameters are at indices -7, -11, -15, ...
+			visitAll(nd.getTypeParameters(), key, IdContext.typeDecl, -7, -4);
+			// parameter decorators are at indices -8, -12, -16, ...
+			visitAll(nd.getParameterDecorators(), key, IdContext.varBind, -8, -4);
+		}
+
+		@Override
+		public Label visit(SwitchStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(nd.getCases(), isStrict, true, DeclKind.none);
+
+			visit(nd.getDiscriminant(), key, -1);
+
+			if (!lexicals.isEmpty()) {
+				scopeManager.enterScope(nd);
+				scopeManager.addNames(lexicals);
+			}
+			contextManager.enterSwitchStatement(nd);
+			visitAll(nd.getCases(), key);
+			contextManager.leaveSwitchStatement();
+			if (!lexicals.isEmpty())
+				scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(SwitchCase nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTest(), key, -1);
+			visitAll(nd.getConsequent(), key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ForStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(nd.getInit(), isStrict, true, DeclKind.none);
+			Scope scope = null;
+			if (!lexicals.isEmpty()) {
+				scope = scopeManager.enterScope(nd);
+				scopeManager.addNames(lexicals);
+			}
+
+			visit(nd.getTest(), key, 1);
+			visit(nd.getUpdate(), key, 2);
+
+			/**
+			 * If the 'for' statement declares lexical variables in its init, we have to
+			 * handle it specially: while the variables are declared in the newly introduced scope,
+			 * the initialiser expressions are evaluated in the outer scope. Since this differs
+			 * from our normal handling of variable declarations, we have to treat the entire
+			 * declaration inline instead of delegating to the normal visitor methods.
+			 */
+			if (!lexicals.isEmpty()) {
+				VariableDeclaration decl = (VariableDeclaration)nd.getInit();
+				Label declkey = visit((Statement)decl, new Context(key, 0, IdContext.varBind));
+				int idx = 0;
+				for (VariableDeclarator declarator : decl.getDeclarations()) {
+					Label declaratorKey = visit((Expression)declarator, new Context(declkey, idx++, IdContext.varBind));
+
+					// the 'let' bound variable lives in the new scope
+					visit(declarator.getId(), declaratorKey, 0, IdContext.varDecl);
+
+					// but its initialiser does not
+					scopeManager.leaveScope();
+					visit(declarator.getInit(), declaratorKey, 1);
+					scopeManager.reenterScope(scope);
+				}
+			} else {
+				visit(nd.getInit(), key, 0);
+			}
+
+			contextManager.enterLoopStmt(nd);
+			visit(nd.getBody(), key, 3);
+			contextManager.leaveLoopStmt();
+			if (!lexicals.isEmpty())
+				scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(EnhancedForStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			DeclaredNames lexicals = scopeManager.collectDeclaredNames(nd.getLeft(), isStrict, true, DeclKind.none);
+			visit(nd.getRight(), key, 1);
+			if (!lexicals.isEmpty()) {
+				scopeManager.enterScope(nd);
+				scopeManager.addNames(lexicals);
+			}
+			visit(nd.getLeft(), key, 0);
+			visit(nd.getDefaultValue(), key, -1);
+			contextManager.enterLoopStmt(nd);
+			visit(nd.getBody(), key, 2);
+			contextManager.leaveLoopStmt();
+			if (!lexicals.isEmpty())
+				scopeManager.leaveScope();
+			if (nd instanceof ForOfStatement && ((ForOfStatement) nd).isAwait())
+				trapwriter.addTuple("isForAwaitOf", key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ArrayExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getElements(), key, IdContext.varBind, 0);
+			trapwriter.addTuple("arraySize", key, nd.getElements().size());
+			return key;
+		}
+
+		@Override
+		public Label visit(ArrayPattern nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getElements(), key, c.idcontext, 0);
+			visit(nd.getRest(), key, -1, c.idcontext);
+			visitAll(nd.getDefaults(), key, IdContext.varBind, -2, -1);
+			trapwriter.addTuple("arraySize", key, nd.getElements().size());
+			return key;
+		}
+
+		@Override
+		public Label visit(ObjectPattern nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getProperties(), key, c.idcontext, 0);
+			visit(nd.getRest(), key, -1, c.idcontext);
+			return key;
+		}
+
+		@Override
+		public Label visit(ObjectExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getProperties(), key, IdContext.varBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(Property nd, Context c) {
+			Label propkey = trapwriter.localID(nd);
+			int kind = nd.getKind().ordinal();
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("properties", propkey, c.parent, c.childIndex, kind, tostring);
+			locationManager.emitNodeLocation(nd, propkey);
+			visitAll(nd.getDecorators(), propkey, IdContext.varBind, -1, -1);
+			visit(nd.getKey(), propkey, 0, nd.isComputed() ? IdContext.varBind : IdContext.label);
+			visit(nd.getValue(), propkey, 1, c.idcontext);
+			visit(nd.getDefaultValue(), propkey, 2, IdContext.varBind);
+			if (nd.isComputed())
+				trapwriter.addTuple("isComputed", propkey);
+			if (nd.isMethod())
+				trapwriter.addTuple("isMethod", propkey);
+			return propkey;
+		}
+
+		@Override
+		public Label visit(IfStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTest(), key, 0);
+			visit(nd.getConsequent(), key, 1);
+			visit(nd.getAlternate(), key, 2);
+			return key;
+		}
+
+		@Override
+		public Label visit(ConditionalExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTest(), key, 0);
+			visit(nd.getConsequent(), key, 1);
+			visit(nd.getAlternate(), key, 2);
+			return key;
+		}
+
+		@Override
+		public Label visit(LabeledStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLabel(), key, 0, IdContext.label);
+			contextManager.enterLabeledStatement(nd);
+			visit(nd.getBody(), key, 1);
+			contextManager.leaveLabeledStatement(nd);
+			return key;
+		}
+
+		@Override
+		public Label visit(WithStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getObject(), key, 0);
+			visit(nd.getBody(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(DoWhileStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTest(), key, 1);
+			contextManager.enterLoopStmt(nd);
+			visit(nd.getBody(), key, 0);
+			contextManager.leaveLoopStmt();
+			return key;
+		}
+
+		@Override
+		public Label visit(WhileStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTest(), key, 0);
+			contextManager.enterLoopStmt(nd);
+			visit(nd.getBody(), key, 1);
+			contextManager.leaveLoopStmt();
+			return key;
+		}
+
+		@Override
+		public Label visit(CatchClause nd, Context c) {
+			Label key = super.visit(nd, c);
+			scopeManager.enterScope(nd);
+			if (nd.getParam() != null) {
+				scopeManager.addNames(scopeManager.collectDeclaredNames(nd.getParam(), isStrict, false, DeclKind.var));
+				visit(nd.getParam(), key, 0, IdContext.varDecl);
+			}
+			visit(nd.getGuard(), key, 2);
+			visit(nd.getBody(), key, 1);
+			scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(TryStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getBlock(), key, 0);
+			visitAll(nd.getAllHandlers(), key, IdContext.varBind, 1);
+			visit(nd.getFinalizer(), key, -1);
+			return key;
+		}
+
+		@Override
+		public Label visit(JumpStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLabel(), key, 0, IdContext.label);
+			Label targetKey = trapwriter.localID(contextManager.getTarget(nd));
+			trapwriter.addTuple("jumpTargets", key, targetKey);
+			return key;
+		}
+
+		@Override
+		public Label visit(ReturnStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0, IdContext.varBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(ThrowStatement nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0, IdContext.varBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(SequenceExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getExpressions(), key, IdContext.varBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(ParenthesizedExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0, IdContext.varBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(TaggedTemplateExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTag(), key, 0);
+			visit(nd.getQuasi(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(TemplateLiteral nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getChildren(), key, IdContext.varBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(TemplateElement nd, Context c) {
+			Label key = super.visit(nd, c);
+			String cooked;
+			if (nd.getCooked() == null)
+				cooked = "";
+			else
+				cooked = String.valueOf(nd.getCooked());
+			trapwriter.addTuple("literals", cooked, nd.getRaw(), key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ClassDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			if (nd.hasDeclareKeyword()) {
+				trapwriter.addTuple("hasDeclareKeyword", lbl);
+			}
+			if (nd.hasAbstractKeyword()) {
+				trapwriter.addTuple("isAbstractClass", lbl);
+			}
+			return visit(nd.getClassDef(), lbl, nd, false);
+		}
+
+		@Override
+		public Label visit(ClassExpression nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			return visit(nd.getClassDef(), lbl, nd, true);
+		}
+
+		@Override
+		public Label visit(TypeParameter nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getId(), key, 0, IdContext.typeDecl);
+			visit(nd.getBound(), key, 1, IdContext.typeBind);
+			visit(nd.getDefault(), key, 2, IdContext.typeBind);
+			return key;
+		}
+
+		private Label visit(AClass ac, Label key, Node scopeNode, boolean isClassExpression) {
+			visitAll(ac.getDecorators(), key, IdContext.varBind, -2, -3);
+			// The identifier of a class declaration is visited before entering the
+			// class scope, since it must resolve to the enclosing block, not its own scope.
+			if (!isClassExpression) {
+				visit(ac.getId(), key, 0, IdContext.varAndTypeDecl);
+			}
+			if (ac.hasId() || ac.hasTypeParameters()) {
+				scopeManager.enterScope(scopeNode);
+				if (isClassExpression && ac.hasId()) {
+					scopeManager.addVariables(ac.getId().getName());
+					scopeManager.addTypeName(ac.getId().getName());
+					// Caveat: if the class name equals a type parameter name, the class name
+					// is shadowed. We don't model that; instead it will be seen as a type name
+					// that has two declarations (the class name and the type parameter).
+				}
+				for (TypeParameter tp : ac.getTypeParameters()) {
+					scopeManager.addTypeName(tp.getId().getName());
+				}
+			}
+			if (isClassExpression) {
+				visit(ac.getId(), key, 0, IdContext.varAndTypeDecl);
+			}
+			visitAll(ac.getTypeParameters(), key, IdContext.typeDecl, -3, -3);
+			visitAll(ac.getSuperInterfaces(), key, IdContext.typeBind, -1, -3);
+			visit(ac.getSuperClass(), key, 1);
+			MethodDefinition constructor = ac.getBody().getConstructor();
+			if (constructor == null) {
+				addDefaultConstructor(ac);
+			}
+			visit(ac.getBody(), key, 2);
+			if (ac.hasId() || ac.hasTypeParameters()) {
+				scopeManager.leaveScope();
+			}
+			emitNodeSymbol(ac, key);
+			return key;
+		}
+
+		private void emitNodeSymbol(INodeWithSymbol def, Label key) {
+			int symbol = def.getSymbol();
+			if (symbol != -1) {
+				Label symbolLabel = trapwriter.globalID("symbol;" + symbol);
+				trapwriter.addTuple("ast_node_symbol", key, symbolLabel);
+			}
+		}
+
+		@Override
+		public Label visit(NamespaceDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			emitNodeSymbol(nd, lbl);
+			IdContext context = nd.isInstantiated() ? IdContext.varAndNamespaceDecl : IdContext.namespaceDecl;
+			visit(nd.getName(), lbl, -1, context);
+			if (nd.hasDeclareKeyword()) {
+				trapwriter.addTuple("hasDeclareKeyword", lbl);
+			}
+			DeclaredNames hoistedVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, false, DeclKind.none);
+			DeclaredNames lexicalVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, true, DeclKind.none);
+			scopeManager.enterScope(nd);
+			scopeManager.addNames(hoistedVars);
+			scopeManager.addNames(lexicalVars);
+			contextManager.enterContainer(lbl);
+			visitAll(nd.getBody(), lbl);
+			contextManager.leaveContainer();
+			scopeManager.leaveScope();
+			if (nd.isInstantiated()) {
+				trapwriter.addTuple("isInstantiated", lbl);
+			}
+			return lbl;
+		}
+
+		/**
+		 * Add a synthetic default constructor to {@code ac}: for classes without a
+		 * superclass, the default constructor is {@code constructor() {}}, for those
+		 * with a superclass, it is {@code constructor(...args) { super(...args); }}.
+		 */
+		private void addDefaultConstructor(AClass ac) {
+			ClassBody classBody = ac.getBody();
+
+			Position loc = classBody.getLoc().getStart();
+
+			// fake identifier `constructor`
+			SourceLocation idLoc = fakeLoc("constructor", loc);
+			Identifier id = new Identifier(idLoc, "constructor");
+
+			// fake body `{}` or `{ super(...args); }`
+			boolean hasSuperClass = ac.hasSuperClass();
+			SourceLocation bodyLoc = fakeLoc(hasSuperClass ? "{ super(...args); }" : "{}", loc);
+			BlockStatement body = new BlockStatement(bodyLoc, new ArrayList<Statement>());
+			if (hasSuperClass) {
+				Identifier argsRef = new Identifier(fakeLoc("args", loc), "args");
+				SpreadElement spreadArgs = new SpreadElement(fakeLoc("...args", loc), argsRef);
+				Super superExpr = new Super(fakeLoc("super", loc));
+				CallExpression superCall = new CallExpression(
+						fakeLoc("super(...args)", loc),
+						superExpr, new ArrayList<>(), CollectionUtil.makeList(spreadArgs));
+				ExpressionStatement superCallStmt = new ExpressionStatement(
+						fakeLoc("super(...args);", loc), superCall);
+				body.getBody().add(superCallStmt);
+			}
+
+			// fake method definition `() {}` or `(...args) { super(...args); }`
+			List<Expression> params = new ArrayList<>();
+			if (hasSuperClass) {
+				Identifier argsDecl = new Identifier(fakeLoc("args", loc), "args");
+				RestElement restArgs = new RestElement(fakeLoc("...args", loc), argsDecl);
+				params.add(restArgs);
+			}
+			AFunction<BlockStatement> fndef = new AFunction<>(null, params, body, false, false, Collections.emptyList(),
+					Collections.emptyList(), Collections.emptyList(), null, null);
+			String fnSrc = hasSuperClass ? "(...args) { super(...args); }" : "() {}";
+			SourceLocation fnloc = fakeLoc(fnSrc, loc);
+			FunctionExpression fn = new FunctionExpression(fnloc, fndef);
+
+			// fake constructor definition `constructor() {}`
+			// or `constructor(...args) { super(...args); }`
+			String ctorSrc = hasSuperClass ? "constructor(...args) { super(...args); }" : "constructor() {}";
+			SourceLocation ctorloc = fakeLoc(ctorSrc, loc);
+			MethodDefinition ctor = new MethodDefinition(ctorloc, DeclarationFlags.none, Kind.CONSTRUCTOR, id, fn);
+			classBody.addMember(ctor);
+		}
+
+		private SourceLocation fakeLoc(String src, Position loc) {
+			return new SourceLocation(src, loc, loc);
+		}
+
+		/** The constructors of all enclosing classes. */
+		private Stack<MethodDefinition> ctors = new Stack<>();
+
+		@Override
+		public Label visit(ClassBody nd, Context c) {
+			ctors.push(nd.getConstructor());
+			visitAll(nd.getBody(), c.parent, c.idcontext, c.childIndex);
+			visitAll(nd.getConstructor().getParameterFields(), c.parent, c.idcontext, c.childIndex + nd.getBody().size());
+			ctors.pop();
+			return c.parent;
+		}
+
+		private int getMethodKind(MethodDefinition nd) {
+			switch (nd.getKind()) {
+			case METHOD:
+			case CONSTRUCTOR:
+				return 0;
+			case GET:
+				return 1;
+			case SET:
+				return 2;
+			case FUNCTION_CALL_SIGNATURE:
+				return 4;
+			case CONSTRUCTOR_CALL_SIGNATURE:
+				return 5;
+			case INDEX_SIGNATURE:
+				return 6;
+			}
+			return 0;
+		}
+
+		private int getFieldKind(FieldDefinition nd) {
+			return nd.isParameterField() ? 9 : 8;
+		}
+
+		@Override
+		public Label visit(MemberDefinition<?> nd, Context c) {
+			Label methkey = trapwriter.localID(nd);
+			int kind;
+			if (nd instanceof MethodDefinition) {
+				kind = getMethodKind((MethodDefinition) nd);
+			} else {
+				kind = getFieldKind((FieldDefinition) nd);
+			}
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("properties", methkey, c.parent, c.childIndex, kind, tostring);
+			locationManager.emitNodeLocation(nd, methkey);
+			visitAll(nd.getDecorators(), methkey, IdContext.varBind, -1, -1);
+			visit(nd.getKey(), methkey, 0, nd.isComputed() ? IdContext.varBind : IdContext.label);
+
+			// the initialiser expression of an instance field is evaluated as part of
+			// the constructor, so we adjust our syntactic context to reflect this
+			MethodDefinition ctor = null;
+			if (nd instanceof FieldDefinition && !nd.isStatic() && !ctors.isEmpty())
+				ctor = ctors.peek();
+			Label constructorKey = null;
+			if (ctor != null) {
+				constructorKey = trapwriter.localID(ctor.getValue());
+				contextManager.enterContainer(constructorKey);
+			}
+			visit(nd.getValue(), methkey, 1, c.idcontext);
+			if (ctor != null)
+				contextManager.leaveContainer();
+
+			if (nd instanceof MethodDefinition && !nd.isCallSignature() && !nd.isIndexSignature())
+				trapwriter.addTuple("isMethod", methkey);
+			// Emit tuples for isStatic, isAbstract, isComputed, etc
+			for (int i = 0; i < DeclarationFlags.numberOfFlags; ++i) {
+				if (DeclarationFlags.hasNthFlag(nd.getFlags(), i)) {
+					trapwriter.addTuple(DeclarationFlags.relationNames.get(i), methkey);
+				}
+			}
+
+			if (nd instanceof FieldDefinition) {
+				FieldDefinition field = (FieldDefinition) nd;
+				if (field.isParameterField() && constructorKey != null) {
+					trapwriter.addTuple("parameter_fields", methkey, constructorKey, field.getFieldParameterIndex());
+				} else {
+					visit(field.getTypeAnnotation(), methkey, 2, IdContext.typeBind);
+				}
+			}
+
+			return methkey;
+		}
+
+		@Override
+		public Label visit(MetaProperty nd, Context c) {
+			return visit((Expression)nd, c);
+		}
+
+		@Override
+		public Label visit(ExportAllDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getSource(), lbl, 0);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(ExportDefaultDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getDeclaration(), lbl, 0, IdContext.export);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(ExportNamedDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getDeclaration(), lbl, -1);
+			visit(nd.getSource(), lbl, -2);
+			visitAll(nd.getSpecifiers(), lbl, nd.hasSource() ? IdContext.label : IdContext.export, 0);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(ExportSpecifier nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getLocal(), lbl, 0, c.idcontext);
+			visit(nd.getExported(), lbl, 1, IdContext.label);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(ImportDeclaration nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getSource(), lbl, -1);
+			visitAll(nd.getSpecifiers(), lbl);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(ImportSpecifier nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getImported(), lbl, 0, IdContext.label);
+			visit(nd.getLocal(), lbl, 1, nd instanceof ImportNamespaceSpecifier ? IdContext.varAndNamespaceDecl : IdContext.varAndTypeAndNamespaceDecl);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(JSXElement nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			JSXOpeningElement open = nd.getOpeningElement();
+			IJSXName name = open.getName();
+			/*
+			 * Children of JSX elements are populated at the following indices:
+			 *
+			 *  - -1: element name (omitted for fragments)
+			 *  - 0, 1, 2, ...: attributes
+			 *  - -2, -3, ...: body elements
+			 *
+			 * A spread attribute is represented as an attribute without
+			 * a name, whose value is a spread element.
+			 */
+			visit(name, lbl, -1, isTagName(name) ? IdContext.label : IdContext.varBind);
+			visitAll(open.getAttributes(), lbl, IdContext.varBind, 0, 1);
+			visitAll(nd.getChildren(), lbl, IdContext.varBind, -2, -1);
+			return lbl;
+		}
+
+		/**
+		 * A JSX element name is interpreted as an HTML tag name if it starts
+		 * with a lower-case character or contains a dash.
+		 */
+		private boolean isTagName(IJSXName name) {
+			if (name instanceof JSXIdentifier) {
+				String id = ((JSXIdentifier) name).getName();
+				return Character.isLowerCase(id.charAt(0)) || id.contains("-");
+			}
+			return false;
+		}
+
+		@Override
+		public Label visit(JSXIdentifier nd, Context c) {
+			return visit((Identifier) nd, c);
+		}
+
+		@Override
+		public Label visit(JSXMemberExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getObject(), key, 0);
+			visit(nd.getName(), key, 1, IdContext.label);
+			return key;
+		}
+
+		@Override
+		public Label visit(JSXNamespacedName nd, Context c) {
+			Label lbl = super.visit(nd, c);
+			visit(nd.getNamespace(), lbl, 0, IdContext.label);
+			visit(nd.getName(), lbl, 1, IdContext.label);
+			return lbl;
+		}
+
+		@Override
+		public Label visit(JSXAttribute nd, Context c) {
+			Label propkey = trapwriter.localID(nd);
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("properties", propkey, c.parent, c.childIndex, 3, tostring);
+			locationManager.emitNodeLocation(nd, propkey);
+			visit(nd.getName(), propkey, 0, IdContext.label);
+			visit(nd.getValue(), propkey, 1, c.idcontext);
+			return propkey;
+		}
+
+		@Override
+		public Label visit(JSXSpreadAttribute nd, Context c) {
+			// We want to represent a spread attribute like `{...props}` as an anonymous attribute
+			// whose value is a spread expression `...props`. Hence we need two entities,
+			// one for the attribute and one for the spread expression, which both correspond
+			// to the same AST node. We achieve this by using a special label kind for the former
+			// to make the trap writer give it a different label
+
+			// first, make one entity for the attribute, and populate its entry
+			// in the `properties` table
+			Label propkey = trapwriter.localID(nd, "JSXSpreadAttribute");
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("properties", propkey, c.parent, c.childIndex, 3, tostring);
+			locationManager.emitNodeLocation(nd, propkey);
+
+			// now populate the spread expression, stripping off the surrounding
+			// braces for its tostring
+			tostring = tostring.substring(1, tostring.length()-1).trim();
+			Label valkey = visit(nd, 66, tostring, new Context(propkey, 1, IdContext.varBind));
+			visit(nd.getArgument(), valkey, 0);
+			return propkey;
+		}
+
+		@Override
+		public Label visit(JSXExpressionContainer nd, Context c) {
+			return visit(nd.getExpression(), c.parent, c.childIndex);
+		}
+
+		@Override
+		public Label visit(JSXEmptyExpression nd, Context c) {
+			return visit(nd, 91, c);
+		}
+
+		@Override
+		public Label visit(AwaitExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArgument(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(Decorator nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(BindExpression nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getObject(), key, 0);
+			visit(nd.getCallee(), key, 1);
+			return key;
+		}
+
+		@Override
+		public Label visit(ImportWholeDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLhs(), key, 0, IdContext.varAndTypeAndNamespaceDecl);
+			visit(nd.getRhs(), key, 1, IdContext.export);
+			return key;
+		}
+
+		@Override
+		public Label visit(ExportWholeDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getRhs(), key, 0, IdContext.export);
+			return key;
+		}
+
+		@Override
+		public Label visit(ExternalModuleReference nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(DynamicImport nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getSource(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(InterfaceDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			if (nd.hasTypeParameters()) {
+				scopeManager.enterScope(nd);
+				for (TypeParameter tp : nd.getTypeParameters()) {
+					scopeManager.addTypeName(tp.getId().getName());
+				}
+			}
+			visitAll(nd.getTypeParameters(), key, IdContext.typeBind, -2, -2);
+			visitAll(nd.getSuperInterfaces(), key, IdContext.typeBind, -1, -2);
+			visit(nd.getName(), key, 0, IdContext.typeDecl);
+			visitAll(nd.getBody(), key, IdContext.label, 2);
+			if (nd.hasTypeParameters()) {
+				scopeManager.leaveScope();
+			}
+			emitNodeSymbol(nd, key);
+			return key;
+		}
+
+		@Override
+		public Label visit(KeywordTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			trapwriter.addTuple("literals", nd.getKeyword(), nd.getKeyword(), key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ArrayTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getElementType(), key, 0, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(UnionTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getElementTypes(), key, IdContext.typeBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(IndexedAccessTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getObjectType(), key, 0, IdContext.typeBind);
+			visit(nd.getIndexType(), key, 1, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(IntersectionTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getElementTypes(), key, IdContext.typeBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(ParenthesizedTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getElementType(), key, 0, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(TupleTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getElementTypes(), key, IdContext.typeBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(KeyofTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getElementType(), key, 0, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(GenericTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTypeName(), key, -1, IdContext.typeBind);
+			visitAll(nd.getTypeArguments(), key, IdContext.typeBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(TypeofTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0, IdContext.varInTypeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(IsTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getLeft(), key, 0, IdContext.varInTypeBind);
+			visit(nd.getRight(), key, 1, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(InterfaceTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getBody(), key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ExpressionWithTypeArguments nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, -1, IdContext.varBind);
+			visitAll(nd.getTypeArguments(), key, IdContext.typeBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(FunctionTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getFunction(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(TypeAssertion nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0);
+			visit(nd.getTypeAnnotation(), key, 1, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(MappedTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			scopeManager.enterScope(nd);
+			scopeManager.addTypeName(nd.getTypeParameter().getId().getName());
+			visit(nd.getTypeParameter(), key, 0, IdContext.typeDecl);
+			visit(nd.getElementType(), key, 1, IdContext.typeBind);
+			scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(TypeAliasDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getId(), key, 0, IdContext.typeDecl);
+			if (nd.hasTypeParameters()) {
+				scopeManager.enterScope(nd);
+				for (TypeParameter tp : nd.getTypeParameters()) {
+					scopeManager.addTypeName(tp.getId().getName());
+				}
+			}
+			visitAll(nd.getTypeParameters(), key, IdContext.typeDecl, 2, 1);
+			visit(nd.getDefinition(), key, 1, IdContext.typeBind);
+			if (nd.hasTypeParameters()) {
+				scopeManager.leaveScope();
+			}
+			emitNodeSymbol(nd, key);
+			return key;
+		}
+
+		@Override
+		public Label visit(EnumDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getId(), key, 0, IdContext.varAndTypeAndNamespaceDecl);
+			visitAll(nd.getDecorators(), key, IdContext.varBind, -1, -1);
+			scopeManager.enterScope(nd);
+			for (EnumMember member : nd.getMembers()) {
+				scopeManager.addVariables(member.getId().getName());
+				scopeManager.addTypeName(member.getId().getName());
+			}
+			visitAll(nd.getMembers(), key, IdContext.varAndTypeDecl, 1, 1);
+			scopeManager.leaveScope();
+			if (nd.isConst()) {
+				trapwriter.addTuple("isConstEnum", key);
+			}
+			if (nd.hasDeclareKeyword()) {
+				trapwriter.addTuple("hasDeclareKeyword", key);
+			}
+			emitNodeSymbol(nd, key);
+			return key;
+		}
+
+		@Override
+		public Label visit(EnumMember nd, Context c) {
+			Label key = trapwriter.localID(nd);
+			String tostring = lexicalExtractor.mkToString(nd);
+			trapwriter.addTuple("properties", key, c.parent, c.childIndex, 7, tostring);
+			locationManager.emitNodeLocation(nd, key);
+			visit(nd.getId(), key, 0, IdContext.varAndTypeDecl);
+			visit(nd.getInitializer(), key, 1, IdContext.varBind);
+			emitNodeSymbol(nd, key);
+			return key;
+		}
+
+		@Override
+		public Label visit(ExternalModuleDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			trapwriter.addTuple("hasDeclareKeyword", key);
+			visit(nd.getName(), key, -1, IdContext.label);
+			DeclaredNames hoistedVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, false, DeclKind.none);
+			DeclaredNames lexicalVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, true, DeclKind.none);
+			scopeManager.enterScope(nd);
+			scopeManager.addNames(hoistedVars);
+			scopeManager.addNames(lexicalVars);
+			contextManager.enterContainer(key);
+			visitAll(nd.getBody(), key);
+			contextManager.leaveContainer();
+			scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(ExportAsNamespaceDeclaration nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getId(), key, 0, IdContext.label);
+			return key;
+		}
+
+		@Override
+		public Label visit(DecoratorList nd, Context c) {
+			Label key = super.visit(nd, c);
+			visitAll(nd.getDecorators(), key, IdContext.varBind, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(GlobalAugmentationDeclaration nd, Context c) {
+			// It is possible for declarations in the global scope block to refer
+			// to types not declared in the global scope. For instance:
+			//
+			// interface I {}
+			// declare global {
+			//   var x: I
+			// }
+			//
+			// At extraction time, we model this by introducing a scope for the block
+			// that has the same label as the global scope, but is otherwise a normal scope.
+			// The fake scope does not exist at the QL level, as it is indistinguishable
+			// from the global scope.
+			Label key = super.visit(nd, c);
+			trapwriter.addTuple("hasDeclareKeyword", key);
+			DeclaredNames hoistedVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, false, DeclKind.none);
+			DeclaredNames lexicalVars = scopeManager.collectDeclaredNames(nd.getBody(), isStrict, true, DeclKind.none);
+			scopeManager.enterGlobalAugmentationScope();
+			scopeManager.addNames(hoistedVars);
+			scopeManager.addNames(lexicalVars);
+			contextManager.enterContainer(key);
+			visitAll(nd.getBody(), key);
+			contextManager.leaveContainer();
+			scopeManager.leaveScope();
+			return key;
+		}
+
+		@Override
+		public Label visit(NonNullAssertion nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getExpression(), key, 0);
+			return key;
+		}
+
+		@Override
+		public Label visit(ConditionalTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getCheckType(), key, 0, IdContext.typeBind);
+			Set<String> boundTypes = scopeManager.collectDeclaredInferTypes(nd.getExtendsType());
+			if (!boundTypes.isEmpty()) {
+				scopeManager.enterScope(nd);
+				scopeManager.addTypeNames(boundTypes);
+			}
+			visit(nd.getExtendsType(), key, 1, IdContext.typeBind);
+			visit(nd.getTrueType(), key, 2, IdContext.typeBind);
+			if (!boundTypes.isEmpty()) {
+				scopeManager.leaveScope();
+			}
+			visit(nd.getFalseType(), key, 3, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(InferTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getTypeParameter(), key, 0, IdContext.typeDecl);
+			return key;
+		}
+
+		@Override
+		public Label visit(ImportTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getPath(), key, 0, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(OptionalTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getElementType(), key, 0, IdContext.typeBind);
+			return key;
+		}
+
+		@Override
+		public Label visit(RestTypeExpr nd, Context c) {
+			Label key = super.visit(nd, c);
+			visit(nd.getArrayType(), key, 0, IdContext.typeBind);
+			return key;
+		}
+	}
+
+	public void extract(Node root, Platform platform, SourceType sourceType, int toplevelKind) {
+		trapwriter.addTuple("toplevels", toplevelLabel, toplevelKind);
+		locationManager.emitNodeLocation(root, toplevelLabel);
+
+		root.accept(new V(platform, sourceType), null);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java b/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java
new file mode 100644
index 00000000000..05a00770c2f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java
@@ -0,0 +1,572 @@
+package com.semmle.js.extractor;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.Reader;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.FileVisitResult;
+import java.nio.file.FileVisitor;
+import java.nio.file.Files;
+import java.nio.file.InvalidPathException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.SimpleFileVisitor;
+import java.nio.file.attribute.BasicFileAttributes;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Stream;
+
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.extractor.FileExtractor.FileType;
+import com.semmle.js.extractor.trapcache.DefaultTrapCache;
+import com.semmle.js.extractor.trapcache.DummyTrapCache;
+import com.semmle.js.extractor.trapcache.ITrapCache;
+import com.semmle.js.parser.ParsedProject;
+import com.semmle.js.parser.TypeScriptParser;
+import com.semmle.ts.extractor.TypeExtractor;
+import com.semmle.ts.extractor.TypeTable;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.defect.Language;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.exception.ResourceError;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.extraction.ExtractorOutputConfig;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.io.csv.CSVReader;
+import com.semmle.util.process.Env;
+import com.semmle.util.projectstructure.ProjectLayout;
+import com.semmle.util.trap.TrapWriter;
+
+/**
+ * An alternative entry point to the JavaScript extractor.
+ *
+ * <p>
+ * It assumes the following environment variables to be set:
+ * </p>
+ *
+ * <ul>
+ * <li><code>LGTM_SRC</code>: the source root;</li>
+ * <li><code>SEMMLE_DIST</code>: the distribution root.</li>
+ * </ul>
+ *
+ * <p>
+ * It extracts the following:
+ * </p>
+ *
+ * <ol>
+ * <li>all <code>*.js</code> files under <code>$SEMMLE_DIST/tools/data/externs</code>
+ *     (cf. {@link AutoBuild#extractExterns()};</li>
+ * <li>all source code files (cf. {@link AutoBuild#extractSource()}.</li>
+ * </ol>
+ *
+ * <p>
+ * In the second step, the set of files to extract is determined in two phases: the walking
+ * phase, which computes a set of candidate files, and the filtering phase. A file is
+ * extracted if it is a candidate, its type is supported
+ * (cf. {@link FileExtractor#supports(File)}), and it is not filtered out in the filtering phase.
+ * </p>
+ *
+ * <p>
+ * The walking phase is parameterised by a set of <i>include paths</i> and a set of <i>exclude
+ * paths</i>. By default, the single include path is <code>LGTM_SRC</code>. If the environment
+ * variable <code>LGTM_INDEX_INCLUDE</code> is set, it is interpreted as a newline-separated list
+ * of include paths, which are slash-separated paths relative to <code>LGTM_SRC</code>. This
+ * list <i>replaces</i> (rather than extends) the default include path.
+ * </p>
+ *
+ * <p>
+ * Similarly, the set of exclude paths is determined by the environment variables
+ * <code>LGTM_INDEX_EXCLUDE</code> and <code>LGTM_REPOSITORY_FOLDERS_CSV</code>. The former
+ * is interpreted like <code>LGTM_INDEX_EXCLUDE</code>, that is, a newline-separated list
+ * of exclude paths relative to <code>LGTM_SRC</code>. The latter is interpreted as
+ * the path of a CSV file, where each line in the file consists of a classification tag
+ * and an absolute path; any path classified as "external" or "metadata" becomes an
+ * exclude path. Note that there are no implicit exclude paths.
+ * </p>
+ *
+ * <p>
+ * The walking phase starts at each include path in turn and recursively traverses folders and
+ * files. Symlinks and hidden folders are skipped, but not hidden files. If it encounters a
+ * sub-folder whose path is excluded, traversal stops. If it encounters a file, that file
+ * becomes a candidate, unless its path is excluded. If the path of a file is both an include
+ * path and an exclude path, the inclusion takes precedence, and the file becomes a candidate
+ * after all.
+ * </p>
+ *
+ * <p>
+ * If an include or exclude path cannot be resolved, a warning is printed and the path is ignored.
+ * </p>
+ *
+ * <p>
+ * Note that the overall effect of this procedure is that the precedence of include and
+ * exclude paths is derived from their specificity: a more specific include/exclude takes
+ * precedence over a less specific include/exclude. In case of a tie, the include takes
+ * precedence.
+ * </p>
+ *
+ * <p>
+ * The filtering phase is parameterised by a list of include/exclude patterns in the style of
+ * {@link ProjectLayout} specifications. There are some built-in include patterns discussed
+ * below. Additionally, the environment variable <code>LGTM_INDEX_FILTERS</code> is interpreted
+ * as a newline-separated list of patterns to append to that list (hence taking precedence over
+ * the built-in patterns). Unlike for {@link ProjectLayout}, patterns in
+ * <code>LGTM_INDEX_FILTERS</code> use the syntax <code>include: pattern</code> for inclusions
+ * and <code>exclude: pattern</code> for exclusions.
+ * </p>
+ *
+ * <p>
+ * The default inclusion patterns cause the following files to be included:
+ * </p>
+ * <ul>
+ * <li>All JavaScript files, that is, files with one of the extensions supported by
+ *     {@link FileType#JS} (currently ".js", ".jsx", ".mjs", ".es6", ".es").</li>
+ * <li>All HTML files, that is, files with with one of the extensions supported by
+ *     {@link FileType#HTML} (currently ".htm", ".html", ".xhtm", ".xhtml", ".vue").</li>
+ * <li>Files with base name "package.json".</li>
+ * <li>JavaScript, JSON or YAML files whose base name starts with ".eslintrc".</li>
+ * <li>All extension-less files.</li>
+ * </ul>
+ *
+ * <p>
+ * Additionally, if the environment variable <code>LGTM_INDEX_TYPESCRIPT</code> is set to
+ * "basic" (default) or "full", files with one of the extensions supported by {@link FileType#TYPESCRIPT} (currently
+ * ".ts" and ".tsx") are also included. In case of "full", type information from the TypeScript
+ * compiler is extracted as well.
+ * </p>
+ *
+ * <p>
+ * JavaScript files are normally extracted with {@link SourceType#AUTO}, but an explicit
+ * source type can be specified in the environment variable <code>LGTM_INDEX_SOURCE_TYPE</code>.
+ * </p>
+ *
+ * <p>
+ * Note that all these customisations only apply to <code>LGTM_SRC</code>. Extraction of
+ * externs is not customisable.
+ * </p>
+ *
+ * <p>
+ * Finally, the environment variables <code>LGTM_TRAP_CACHE</code> and
+ * <code>LGTM_TRAP_CACHE_BOUND</code> can optionally be used to specify the location and size
+ * of a trap cache to be used during extraction.
+ * </p>
+ */
+public class AutoBuild {
+	private final ExtractorOutputConfig outputConfig;
+	private final ITrapCache trapCache;
+	private Set<Path> includes = new LinkedHashSet<>();
+	private Set<Path> excludes = new LinkedHashSet<>();
+	private ProjectLayout filters;
+	private final Path LGTM_SRC, SEMMLE_DIST;
+	private final TypeScriptMode typeScriptMode;
+	private final String defaultEncoding;
+	private ExtractorState extractorState;
+	private long timedLogMessageStart = 0;
+
+	public AutoBuild() {
+		this.LGTM_SRC = toRealPath(getPathFromEnvVar("LGTM_SRC"));
+		this.SEMMLE_DIST = getPathFromEnvVar(Env.Var.SEMMLE_DIST.toString());
+		this.outputConfig = new ExtractorOutputConfig(Language.JAVASCRIPT);
+		this.trapCache = mkTrapCache();
+		this.typeScriptMode = getEnumFromEnvVar("LGTM_INDEX_TYPESCRIPT", TypeScriptMode.class, TypeScriptMode.BASIC);
+		this.defaultEncoding = getEnvVar("LGTM_INDEX_DEFAULT_ENCODING");
+		this.extractorState = new ExtractorState();
+		setupMatchers();
+	}
+
+	private String getEnvVar(String envVarName) {
+		return getEnvVar(envVarName, null);
+	}
+
+	private String getEnvVar(String envVarName, String deflt) {
+		String value = Env.systemEnv().getNonEmpty(envVarName);
+		if (value == null)
+			return deflt;
+		return value;
+	}
+
+	private Path getPathFromEnvVar(String envVarName) {
+		String lgtmSrc = getEnvVar(envVarName);
+		if (lgtmSrc == null)
+			throw new UserError(envVarName + " must be set.");
+		Path path = Paths.get(lgtmSrc);
+		return path;
+	}
+
+	private <T extends Enum<T>> T getEnumFromEnvVar(String envVarName, Class<T> enumClass, T defaultValue) {
+		String envValue = getEnvVar(envVarName);
+		if (envValue == null)
+			return defaultValue;
+		try {
+			return Enum.valueOf(enumClass, StringUtil.uc(envValue));
+		} catch (IllegalArgumentException ex) {
+			Exceptions.ignore(ex, "We rewrite this to a meaningful user error.");
+			Stream<String> enumNames = Arrays.asList(enumClass.getEnumConstants()).stream().map(c -> StringUtil.lc(c.toString()));
+			throw new UserError(envVarName + " must be set to one of: " + StringUtil.glue(", ", enumNames.toArray()));
+		}
+	}
+
+	/**
+	 * Convert {@code p} to a real path (as per {@link Path#toRealPath(java.nio.file.LinkOption...)}),
+	 * throwing a {@link ResourceError} if this fails.
+	 */
+	private Path toRealPath(Path p) {
+		try {
+			return p.toRealPath();
+		} catch (IOException e) {
+			throw new ResourceError("Could not compute real path for " + p + ".", e);
+		}
+	}
+
+	/**
+	 * Set up TRAP cache based on environment variables <code>LGTM_TRAP_CACHE</code> and
+	 * <code>LGTM_TRAP_CACHE_BOUND</code>.
+	 */
+	private ITrapCache mkTrapCache() {
+		ITrapCache trapCache;
+		String trapCachePath = getEnvVar("LGTM_TRAP_CACHE");
+		if (trapCachePath != null) {
+			Long sizeBound = null;
+			String trapCacheBound = getEnvVar("LGTM_TRAP_CACHE_BOUND");
+			if (trapCacheBound != null) {
+				sizeBound = DefaultTrapCache.asFileSize(trapCacheBound);
+				if (sizeBound == null)
+					throw new UserError("Invalid TRAP cache size bound: " + trapCacheBound);
+			}
+			trapCache = new DefaultTrapCache(trapCachePath, sizeBound, Main.EXTRACTOR_VERSION);
+		} else {
+			trapCache = new DummyTrapCache();
+		}
+		return trapCache;
+	}
+
+	/**
+	 * Set up include and exclude matchers based on environment variables.
+	 */
+	private void setupMatchers() {
+		setupIncludesAndExcludes();
+		setupFilters();
+	}
+
+	/**
+	 * Set up include matchers based on <code>LGTM_INDEX_INCLUDE</code> and
+	 * <code>LGTM_INDEX_TYPESCRIPT</code>.
+	 */
+	private void setupIncludesAndExcludes() {
+		// process `$LGTM_INDEX_INCLUDE` and `$LGTM_INDEX_EXCLUDE`
+		boolean seenInclude = false;
+		for (String pattern : Main.NEWLINE.split(getEnvVar("LGTM_INDEX_INCLUDE", "")))
+			seenInclude |= addPathPattern(includes, LGTM_SRC, pattern);
+		if (!seenInclude)
+			includes.add(LGTM_SRC);
+		for (String pattern : Main.NEWLINE.split(getEnvVar("LGTM_INDEX_EXCLUDE", "")))
+			addPathPattern(excludes, LGTM_SRC, pattern);
+
+		// process `$LGTM_REPOSITORY_FOLDERS_CSV`
+		String lgtmRepositoryFoldersCsv = getEnvVar("LGTM_REPOSITORY_FOLDERS_CSV");
+		if (lgtmRepositoryFoldersCsv != null) {
+			Path path = Paths.get(lgtmRepositoryFoldersCsv);
+			try (Reader reader = Files.newBufferedReader(path, StandardCharsets.UTF_8);
+					CSVReader csv = new CSVReader(reader)) {
+				// skip titles
+				csv.readNext();
+				String[] fields;
+				while ((fields = csv.readNext()) != null) {
+					if (fields.length != 2)
+						continue;
+					if ("external".equals(fields[0]) || "metadata".equals(fields[0])) {
+						String folder = fields[1];
+						try {
+							Path folderPath = folder.startsWith("file://") ? Paths.get(new URI(folder)) : Paths.get(folder);
+							excludes.add(toRealPath(folderPath));
+						} catch (InvalidPathException | URISyntaxException | ResourceError e) {
+							Exceptions.ignore(e, "Ignore path and print warning message instead");
+							System.err.println("Ignoring '" + fields[0] + "' classification for " +
+									folder + ", which is not a valid path.");
+							System.err.flush();
+						}
+					}
+				}
+			} catch (IOException e) {
+				throw new ResourceError("Unable to process LGTM repository folder CSV.", e);
+			}
+		}
+	}
+
+	private void setupFilters() {
+		List<String> patterns = new ArrayList<String>();
+		patterns.add("/");
+
+		// exclude all files with extensions
+		patterns.add("-**/*.*");
+
+		// but include HTML, JavaScript and (optionally) TypeScript
+		Set<FileType> defaultExtract = new LinkedHashSet<FileType>();
+		defaultExtract.add(FileType.HTML);
+		defaultExtract.add(FileType.JS);
+		if (typeScriptMode != TypeScriptMode.NONE)
+			defaultExtract.add(FileType.TYPESCRIPT);
+		for (FileType filetype : defaultExtract)
+			for (String extension : filetype.getExtensions())
+				patterns.add("**/*" + extension);
+
+		// include .eslintrc files and package.json files
+		patterns.add("**/.eslintrc*");
+		patterns.add("**/package.json");
+
+		String base = LGTM_SRC.toString().replace('\\', '/');
+		// process `$LGTM_INDEX_FILTERS`
+		for (String pattern : Main.NEWLINE.split(getEnvVar("LGTM_INDEX_FILTERS", ""))) {
+			pattern = pattern.trim();
+			if (pattern.isEmpty())
+				continue;
+			String[] fields = pattern.split(":");
+			if (fields.length != 2)
+				continue;
+			pattern = fields[1].trim();
+			pattern = base + "/" + pattern;
+			if ("exclude".equals(fields[0].trim()))
+				pattern = "-" + pattern;
+			patterns.add(pattern);
+		}
+
+		filters = new ProjectLayout(patterns.toArray(new String[0]));
+	}
+
+	/**
+	 * Add {@code pattern} to {@code patterns}, trimming off whitespace and prepending
+	 * {@code base} to it. If {@code pattern} ends with a trailing slash, that slash
+	 * is stripped off.
+	 *
+	 * @return true if {@code pattern} is non-empty
+	 */
+	private boolean addPathPattern(Set<Path> patterns, Path base, String pattern) {
+		pattern = pattern.trim();
+		if (pattern.isEmpty())
+			return false;
+		Path path = base.resolve(pattern);
+		try {
+			Path realPath = toRealPath(path);
+			patterns.add(realPath);
+		} catch (ResourceError e) {
+			Exceptions.ignore(e, "Ignore exception and print warning instead.");
+			System.err.println("Skipping path " + path + ", which does not exist.");
+			System.err.flush();
+		}
+		return true;
+	}
+
+	/**
+	 * Perform extraction.
+	 */
+	public void run() throws IOException {
+		extractExterns();
+		extractSource();
+	}
+
+	/**
+	 * Extract all "*.js" files under <code>$SEMMLE_DIST/tools/data/externs</code> as
+	 * externs.
+	 */
+	private void extractExterns() throws IOException {
+		ExtractorConfig config = new ExtractorConfig(true).withExterns(true);
+		FileExtractor extractor = new FileExtractor(config, outputConfig, trapCache, extractorState);
+		FileVisitor<? super Path> visitor = new SimpleFileVisitor<Path>() {
+			@Override
+			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+				if (".js".equals(FileUtil.extension(file.toString())))
+					extract(extractor, file);
+				return super.visitFile(file, attrs);
+			}
+		};
+		Path externs = SEMMLE_DIST.resolve("tools").resolve("data").resolve("externs");
+		Files.walkFileTree(externs, visitor);
+	}
+
+	/**
+	 * Extract all supported candidate files that pass the filters.
+	 */
+	private void extractSource() throws IOException {
+		ExtractorConfig config = new ExtractorConfig(true);
+		config = config.withSourceType(getSourceType());
+		config = config.withTypeScriptMode(typeScriptMode);
+		if (defaultEncoding != null)
+			config = config.withDefaultEncoding(defaultEncoding);
+		FileExtractor extractor = new FileExtractor(config, outputConfig, trapCache, extractorState);
+		Path[] currentRoot = new Path[1];
+		final Set<Path> filesToExtract = new LinkedHashSet<>();
+		final List<Path> tsconfigFiles = new ArrayList<>();
+		FileVisitor<? super Path> visitor = new SimpleFileVisitor<Path>() {
+			private boolean isFileIncluded(Path file) {
+				// normalise path for matching
+				String path = file.toString().replace('\\', '/');
+				if (path.charAt(0) != '/')
+					path = "/" + path;
+				return filters.includeFile(path);
+			}
+
+			@Override
+			public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+				if (attrs.isSymbolicLink())
+					return FileVisitResult.SKIP_SUBTREE;
+
+				if (!file.equals(currentRoot[0]) && excludes.contains(file))
+					return FileVisitResult.SKIP_SUBTREE;
+
+				// extract files that are supported and pass the include/exclude patterns
+				if (extractor.supports(file.toFile()) && isFileIncluded(file)) {
+					filesToExtract.add(normalizePath(file));
+				}
+
+				// extract TypeScript projects from 'tsconfig.json'
+				if (typeScriptMode == TypeScriptMode.FULL && file.getFileName().endsWith("tsconfig.json") && !excludes.contains(file)) {
+					tsconfigFiles.add(file);
+				}
+
+				return super.visitFile(file, attrs);
+			}
+
+			@Override
+			public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
+				if (!dir.equals(currentRoot[0]) && (excludes.contains(dir) || dir.toFile().isHidden()))
+					return FileVisitResult.SKIP_SUBTREE;
+				return super.preVisitDirectory(dir, attrs);
+			}
+		};
+		for (Path root : includes) {
+			currentRoot[0] = root;
+			Files.walkFileTree(currentRoot[0], visitor);
+		}
+
+		// If there are any .ts files, verify that TypeScript is installed.
+		TypeScriptParser tsParser = extractorState.getTypeScriptParser();
+		boolean hasTypeScriptFiles = false;
+		for (Path file : filesToExtract) {
+			// Check if there are any files with the TypeScript extension.
+			// Do not use FileType.forFile as it involves I/O for file header checks,
+			// and files with a bad header have already been excluded.
+			if (FileType.forFileExtension(file.toFile()) == FileType.TYPESCRIPT) {
+				hasTypeScriptFiles = true;
+				break;
+			}
+		}
+		if (hasTypeScriptFiles || !tsconfigFiles.isEmpty()) {
+			verifyTypeScriptInstallation();
+		}
+
+		// Extract TypeScript projects
+		Set<Path> extractedFiles = new LinkedHashSet<>();
+		for (Path projectPath : tsconfigFiles) {
+			File projectFile = projectPath.toFile();
+			logBeginProcess("Opening project " + projectFile);
+			ParsedProject project = tsParser.openProject(projectFile);
+			logEndProcess();
+			// Extract all files belonging to this project which are also matched
+			// by our include/exclude filters.
+			for (File sourceFile : project.getSourceFiles()) {
+				Path sourcePath = sourceFile.toPath();
+				if (!filesToExtract.contains(normalizePath(sourcePath)))
+					continue;
+				if (extractedFiles.add(sourcePath)) {
+					extract(extractor, sourcePath);
+				}
+			}
+			tsParser.closeProject(projectFile);
+		}
+
+		if (!tsconfigFiles.isEmpty()) {
+			// Extract all the types discovered when extracting the ASTs.
+			TypeTable typeTable = tsParser.getTypeTable();
+			extractTypeTable(tsconfigFiles.iterator().next(), typeTable);
+
+			// The TypeScript compiler instance is no longer needed.
+			tsParser.killProcess();
+		}
+
+		// Extract files that were not part of a project.
+		for (Path f : filesToExtract) {
+			if (extractedFiles.add(f)) {
+				extract(extractor, f);
+			}
+		}
+	}
+
+	/**
+	 * Verifies that Node.js and the TypeScript compiler are installed and can be
+	 * found.
+	 */
+	public void verifyTypeScriptInstallation() {
+		extractorState.getTypeScriptParser().verifyInstallation(true);
+	}
+
+	private Path normalizePath(Path path) {
+		return path.toAbsolutePath().normalize();
+	}
+
+	private void extractTypeTable(Path fileHandle, TypeTable table) {
+		TrapWriter trapWriter = outputConfig.getTrapWriterFactory().mkTrapWriter(fileHandle.toFile());
+		try {
+			new TypeExtractor(trapWriter, table).extract();
+		} finally {
+			FileUtil.close(trapWriter);
+		}
+	}
+
+	/**
+	 * Get the source type specified in <code>LGTM_INDEX_SOURCE_TYPE</code>,
+	 * or the default of {@link SourceType#AUTO}.
+	 */
+	private SourceType getSourceType() {
+		String sourceTypeName = getEnvVar("LGTM_INDEX_SOURCE_TYPE");
+		if (sourceTypeName != null) {
+			try {
+				return SourceType.valueOf(StringUtil.uc(sourceTypeName));
+			} catch (IllegalArgumentException e) {
+				Exceptions.ignore(e, "We construct a better error message.");
+				throw new UserError(sourceTypeName + " is not a valid source type.");
+			}
+		}
+		return SourceType.AUTO;
+	}
+
+	/**
+	 * Extract a single file.
+	 */
+	protected void extract(FileExtractor extractor, Path file) throws IOException {
+		File f = file.toFile();
+		if (!f.exists()) {
+			System.err.println("Skipping " + file + ", which does not exist.");
+			System.err.flush();
+			return;
+		}
+
+		logBeginProcess("Extracting " + file);
+		extractor.extract(f);
+		logEndProcess();
+	}
+
+	private void logBeginProcess(String message) {
+		System.out.print(message + "...");
+		System.out.flush();
+		this.timedLogMessageStart = System.nanoTime();
+	}
+
+	private void logEndProcess() {
+		long end = System.nanoTime();
+		int milliseconds = (int) ((end - this.timedLogMessageStart) / 1000000);
+		System.out.println(" done (" + milliseconds + " ms)");
+	}
+
+	public static void main(String[] args) {
+		try {
+			new AutoBuild().run();
+		} catch (IOException | UserError e) {
+			System.err.println(e.toString());
+			System.exit(1);
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/CFGExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/CFGExtractor.java
new file mode 100644
index 00000000000..27ecbb571e2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/CFGExtractor.java
@@ -0,0 +1,1918 @@
+package com.semmle.js.extractor;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.Stack;
+
+import com.semmle.js.ast.AClass;
+import com.semmle.js.ast.AFunctionExpression;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.AwaitExpression;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.BindExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.BreakStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.ComprehensionBlock;
+import com.semmle.js.ast.ComprehensionExpression;
+import com.semmle.js.ast.ConditionalExpression;
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.DestructuringPattern;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.DynamicImport;
+import com.semmle.js.ast.EnhancedForStatement;
+import com.semmle.js.ast.ExportAllDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportDefaultSpecifier;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportNamespaceSpecifier;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.FieldDefinition;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IStatementContainer;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.InvokeExpression;
+import com.semmle.js.ast.JumpStatement;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.LetExpression;
+import com.semmle.js.ast.LetStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.LogicalExpression;
+import com.semmle.js.ast.Loop;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.MethodDefinition;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectExpression;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.ReturnStatement;
+import com.semmle.js.ast.SequenceExpression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Super;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TaggedTemplateExpression;
+import com.semmle.js.ast.TemplateLiteral;
+import com.semmle.js.ast.ThrowStatement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.Visitor;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.ast.YieldExpression;
+import com.semmle.js.ast.jsx.IJSXName;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXNamespacedName;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.util.collections.CollectionUtil;
+import com.semmle.util.data.Pair;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for intra-procedural expression-level control flow graphs.
+ *
+ * The nodes in the CFG are expressions, statements, and synthetic entry and exit
+ * nodes for every function and for every toplevel.
+ *
+ * Exceptional control flow is modeled (mostly) conservatively inside `try`-`catch`,
+ * i.e., most syntactic constructs that can throw an exception at runtime will get
+ * a CFG edge to the enclosing `catch`. We do not model the possible exception
+ * resulting from accessing an undeclared global variable, or possible exceptions
+ * thrown by implicitly invoked conversion methods.
+ *
+ * Outside `try`-`catch`, only `throw` statements have their exceptional control
+ * flow modeled: they have the `exit` node of the enclosing function or toplevel
+ * as their successor.
+ *
+ * Control flow through `finally` is modeled imprecisely: there is only a single
+ * copy of each `finally` block in the CFG, so different control flow paths through
+ * a `finally` block get merged at the block.
+ *
+ * The control flow inside compound expressions and statements reflects execution
+ * order at runtime. For most statements that contain expressions, the statement
+ * appears in the CFG before the contained expression. The two exceptions here
+ * are `return` and `throw`, which both appear _after_ the contained expression
+ * to reflect the fact that the return/throw happens after the expression has
+ * been evaluated.
+ *
+ * For assignments, we take the assignment expression itself to express the
+ * operation of assigning the RHS to the LHS. Thus, in a simple assignment expression
+ * of the form `lhs = rhs`, the control flow is lhs -&gt; rhs -&gt; lhs = rhs.
+ *
+ * For most binary expressions, the expression node itself represents the operator
+ * application, so the CFG of `x + y` is x -&gt; y -&gt; x + y. For short-circuiting operators,
+ * on the other hand, the expression node itself acts more like an `if` statement,
+ * hence it comes first in the CFG: `x &amp;&amp; y` has CFG
+ *
+ *     x &amp;&amp; y +&gt; x -&gt; y +&gt; f
+ *            |_________|
+ *
+ * Finally, for a variable declarator with an initialiser, the declarator represents
+ * the assignment of the initialiser expression to the variable. So, the CFG of
+ * `var x = 23` is x -&gt; 23 -&gt; var x = 23.
+ *
+ * The CFG of each function starts with a preamble that visits the parameters and,
+ * for ECMAScript 2015 and above, their default arguments, followed by the identifiers
+ * of each function declaration in the body in lexical order. This reflects the fact
+ * that function declarations are hoisted, but their initialisation happens after
+ * parameters have been assigned.
+ *
+ * Similar considerations apply to toplevels: the preamble visits any import specifiers
+ * first, reflecting the fact that imports are resolved before module evaluation starts,
+ * followed by (the identifiers of) hoisted function declarations.
+ */
+public class CFGExtractor {
+	private final TrapWriter trapwriter;
+	private final Label toplevelLabel;
+	private final LocationManager locationManager;
+
+	public CFGExtractor(ASTExtractor astExtractor) {
+		this.trapwriter = astExtractor.getTrapwriter();
+		this.toplevelLabel = astExtractor.getToplevelLabel();
+		this.locationManager = astExtractor.getLocationManager();
+	}
+
+	@SuppressWarnings("unchecked")
+	private static Iterable<Node> foreach(Object nd) {
+		if (nd == null)
+			return Collections.<Node>emptySet();
+		if (nd instanceof Node)
+			return CollectionUtil.singletonIterable((Node)nd);
+		return (Iterable<Node>)nd;
+	}
+
+	private Iterable<Node> hcaerof(final Object nd) {
+		if (nd == null)
+			return Collections.<Node>emptySet();
+		if (nd instanceof Node)
+			return CollectionUtil.singletonIterable((Node)nd);
+		return new Iterable<Node>() {
+			@SuppressWarnings("unchecked")
+			@Override
+			public Iterator<Node> iterator() {
+				return CollectionUtil.reverseIterator((List<Node>)nd);
+			}
+		};
+	}
+
+	/**
+	 * Returns a list of all the nodes in a tree of nested lists.
+	 */
+	private List<Node> flattenNestedList(Iterable<?> lists) {
+		return flattenNestedList(lists, new ArrayList<>());
+	}
+
+	/**
+	 * Appends all the nodes in a tree of nested lists the given output list, and
+	 * returns that list.
+	 */
+	private List<Node> flattenNestedList(Iterable<?> lists, List<Node> output) {
+		for (Object object : lists) {
+			if (object == null)
+				continue;
+			if (object instanceof Node) {
+				output.add((Node) object);
+			} else if (object instanceof Iterable<?>) {
+				flattenNestedList((Iterable<?>) object, output);
+			} else {
+				throw new RuntimeException("Cannot flatten object: " + object);
+			}
+		}
+		return output;
+	}
+
+	private static Object union(Object xs, Object ys) {
+		if (xs == null)
+			return ys;
+		if (ys == null)
+			return xs;
+		if (xs instanceof List<?>) {
+			@SuppressWarnings("unchecked")
+			List<Node> xsCopy = new ArrayList<Node>((List<Node>)xs);
+			for (Node y : foreach(ys))
+				if (!xsCopy.contains(y))
+					xsCopy.add(y);
+			return xsCopy;
+		} else {
+			if (ys instanceof List<?>) {
+				@SuppressWarnings("unchecked")
+				List<Object> lys = (List<Object>)ys;
+				if (!lys.contains(xs)) {
+					lys = new ArrayList<Object>(lys);
+					lys.add(0, xs);
+				}
+				return lys;
+			} else if (xs == ys) {
+				return xs;
+			} else {
+				List<Node> res = new ArrayList<Node>(2);
+				res.add((Node)xs);
+				res.add((Node)ys);
+				return res;
+			}
+		}
+	}
+
+	private void succ(Object nd, Object succs) {
+		Label ndkey = trapwriter.localID(nd);
+		for (Node succ : foreach(succs))
+			succ(ndkey, succ);
+	}
+
+	private void succ(Label ndkey, Node succ) {
+		trapwriter.addTuple("successor", ndkey, trapwriter.localID(succ));
+	}
+
+	/**
+	 * Compute the first sub-expression or sub-statement in control flow order.
+	 *
+	 * Caution: If you modify this, be sure to also adjust the implementation of the corresponding
+	 * QL-level method ExprParent.getFirstControlFlowNode().
+	 */
+	private static class First extends DefaultVisitor<Void, Node> {
+		@Override
+		public Node visit(Node nd, Void v) {
+			return nd;
+		}
+
+		@Override
+		public Node visit(ReturnStatement nd, Void v) {
+			if (nd.hasArgument())
+				return nd.getArgument().accept(this, v);
+			else
+				return nd;
+		}
+
+		@Override
+		public Node visit(ThrowStatement nd, Void v) {
+			return nd.getArgument().accept(this, v);
+		}
+
+		@Override
+		public Node visit(SpreadElement nd, Void v) {
+			return nd.getArgument().accept(this, v);
+		}
+
+		@Override
+		public Node visit(UnaryExpression nd, Void v) {
+			return nd.getArgument().accept(this, v);
+		}
+
+		@Override
+		public Node visit(UpdateExpression nd, Void v) {
+			return nd.getArgument().accept(this, v);
+		}
+
+		@Override
+		public Node visit(YieldExpression nd, Void v) {
+			Expression argument = nd.getArgument();
+			if (argument != null)
+				return argument.accept(this, v);
+			return nd;
+		}
+
+		@Override
+		public Node visit(Property nd, Void v) {
+			Expression key = nd.getKey();
+			return (key == null ? nd.getValue() : key).accept(this, v);
+		}
+
+		@Override
+		public Node visit(MemberDefinition<?> nd, Void v) {
+			if (!nd.isConcrete() || nd.isParameterField())
+				return nd;
+			return nd.getKey().accept(this, v);
+		}
+
+		// for binary operators, the operands come first (but not for LogicalExpression, see above)
+		@Override
+		public Node visit(BinaryExpression nd, Void v) {
+			return nd.getLeft().accept(this, v);
+		}
+
+		@Override
+		public Node visit(AssignmentExpression nd, Void v) {
+			if (nd.getLeft() instanceof DestructuringPattern)
+				return nd.getRight().accept(this, v);
+			return nd.getLeft().accept(this, v);
+		}
+
+		@Override
+		public Node visit(VariableDeclarator nd, Void v) {
+			if (nd.getId() instanceof DestructuringPattern && nd.hasInit())
+				return nd.getInit().accept(this, v);
+			return nd.getId().accept(this, v);
+		}
+
+		@Override
+		public Node visit(MemberExpression nd, Void v) {
+			return nd.getObject().accept(this, v);
+		}
+
+		@Override
+		public Node visit(InvokeExpression nd, Void v) {
+			return nd.getCallee().accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXElement nd, Void v) {
+			IJSXName name = nd.getOpeningElement().getName();
+			if (name == null) {
+				if (nd.getChildren().isEmpty())
+					return nd;
+				return nd.getChildren().get(0).accept(this, v);
+			}
+			return name.accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXMemberExpression nd, Void v) {
+			return nd.getObject().accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXNamespacedName nd, Void v) {
+			return nd.getNamespace().accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXAttribute nd, Void v) {
+			return nd.getName().accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXSpreadAttribute nd, Void v) {
+			return nd.getArgument().accept(this, v);
+		}
+
+		@Override
+		public Node visit(JSXExpressionContainer nd, Void v) {
+			return nd.getExpression().accept(this, v);
+		}
+
+		@Override
+		public Node visit(AwaitExpression nd, Void c) {
+			return nd.getArgument().accept(this, c);
+		}
+
+		@Override
+		public Node visit(Decorator nd, Void v) {
+			return nd.getExpression().accept(this, v);
+		}
+
+		@Override
+		public Node visit(BindExpression nd, Void v) {
+			if (nd.hasObject())
+				return nd.getObject().accept(this, v);
+			return nd.getCallee().accept(this, v);
+		}
+
+		@Override
+		public Node visit(ExternalModuleReference nd, Void v) {
+			return nd.getExpression().accept(this, v);
+		}
+
+		@Override
+		public Node visit(DynamicImport nd, Void v) {
+			return nd.getSource().accept(this, v);
+		}
+
+		@Override
+		public Node visit(ClassDeclaration nd, Void v) {
+			if (nd.hasDeclareKeyword())
+				return nd;
+			else
+				return nd.getClassDef().getId();
+		}
+
+		@Override
+		public Node visit(ClassExpression nd, Void v) {
+			AClass def = nd.getClassDef();
+			if (def.getId() != null)
+				return def.getId();
+			if (def.getSuperClass() != null)
+				return def.getSuperClass().accept(this, v);
+			Node first = def.getBody().accept(this, v);
+			if (first != null)
+				return first;
+			return nd;
+		}
+
+		@Override
+		public Node visit(ClassBody nd, Void v) {
+			for (MemberDefinition<?> m : nd.getBody()) {
+				if (m instanceof MethodDefinition) {
+					Node first = m.accept(this, v);
+					if (first != null)
+						return first;
+				}
+			}
+			return null;
+		}
+
+		@Override
+		public Node visit(ExpressionWithTypeArguments nd, Void c) {
+			return nd.getExpression().accept(this, c);
+		}
+
+		@Override
+		public Node visit(TypeAssertion nd, Void c) {
+			return nd.getExpression().accept(this, c);
+		}
+
+		@Override
+		public Node visit(NonNullAssertion nd, Void c) {
+			return nd.getExpression().accept(this, c);
+		}
+
+		@Override
+		public Node visit(EnumDeclaration nd, Void c) {
+			return nd.getId();
+		}
+
+		@Override
+		public Node visit(EnumMember nd, Void c) {
+			return nd.getId();
+		}
+
+		@Override
+		public Node visit(DecoratorList nd, Void c) {
+			if (nd.getDecorators().isEmpty())
+				return nd;
+			return nd.getDecorators().get(0).accept(this, c);
+		}
+
+		@Override
+		public Node visit(NamespaceDeclaration nd, Void c) {
+			if (nd.hasDeclareKeyword())
+				return nd;
+			return nd.getName();
+		}
+
+		@Override
+		public Node visit(ImportWholeDeclaration nd, Void c) {
+			return nd.getLhs();
+		}
+
+		@Override
+		public Node visit(EnhancedForStatement nd, Void c) {
+			return nd.getRight().accept(this, null);
+		}
+
+		public static Node of(Node nd) {
+			return nd.accept(new First(), null);
+		}
+	}
+
+	/**
+	 * Collect all hoisted function declaration statements (that is, function
+	 * declarations not nested inside a block statement or control statement) in
+	 * a subtree, returning an array containing their declaring identifiers in
+	 * lexical order.
+	 *
+	 * This is used to construct the function preamble mentioned above.
+	 */
+	private static class HoistedFunDecls extends DefaultVisitor<Void, Void> {
+		private List<Identifier> decls = new ArrayList<Identifier>();
+
+		@Override
+		public Void visit(FunctionDeclaration nd, Void v) {
+			// We do not consider ambient function declarations to be hoisted.
+			if (!nd.hasDeclareKeyword()) {
+				decls.add(nd.getId());
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(LabeledStatement nd, Void v) {
+			return nd.getBody().accept(this, v);
+		}
+
+		@Override
+		public Void visit(ExportDefaultDeclaration nd, Void c) {
+			return nd.getDeclaration().accept(this, c);
+		}
+
+		@Override
+		public Void visit(ExportNamedDeclaration nd, Void c) {
+			if (nd.hasDeclaration())
+				nd.getDeclaration().accept(this, c);
+			return null;
+		}
+
+		private static List<Identifier> of(List<Statement> body) {
+			HoistedFunDecls d = new HoistedFunDecls();
+			for (Node stmt : body)
+				stmt.accept(d, null);
+			return d.decls;
+		}
+
+		public static List<Identifier> of(Program p) {
+			return of(p.getBody());
+		}
+
+		public static List<Identifier> of(IFunction fn) {
+			Node body = fn.getBody();
+			if (body instanceof BlockStatement)
+				return of(((BlockStatement) body).getBody());
+			// if the body of the function is missing or is an expression, then there are
+			// no hoisted functions
+			return Collections.emptyList();
+		}
+	}
+
+	/**
+	 * Class used to represent information about the possible successors of a CFG node
+	 * during extraction.
+	 *
+	 * For expressions and catch clauses, we distinguish between "true" and "false"
+	 * successors (the former being the successors in case the expression or catch guard
+	 * evaluates to a truthy value, the latter the successors for the falsy case); for
+	 * other CFG nodes, no such distinction is made.
+	 */
+	private static abstract class SuccessorInfo {
+		/**
+		 * Get all possible successors, including both "true" and "false" successors
+		 * where applicable.
+		 */
+		public abstract Object getAllSuccessors();
+
+		/**
+		 * Depending on the value of {@code edge}, get only the "true" or only the "false"
+		 * successors (if they are not distinguished, the same set will be returned in
+		 * both cases.)
+		 */
+		public abstract Object getSuccessors(boolean edge);
+
+		/**
+		 * If we have both true and false successors, place guard nodes before them
+		 * indicating that <code>guard</code> is true or false, respectively, and return
+		 * the set containing all guarded successors.
+		 *
+		 * Otherwise, just return the set of all successors.
+		 */
+		public abstract Object getGuardedSuccessors(Expression guard);
+	}
+
+	/**
+	 * A simple implementation of {@link SuccessorInfo} that does not distinguish between
+	 * "true" and "false" successors.
+	 */
+	private static class SimpleSuccessorInfo extends SuccessorInfo {
+		private final Object successors;
+
+		public SimpleSuccessorInfo(Object successors) {
+			this.successors = successors;
+		}
+
+		@Override
+		public Object getAllSuccessors() {
+			return successors;
+		}
+
+		@Override
+		public Object getSuccessors(boolean edge) {
+			return successors;
+		}
+
+		@Override
+		public Object getGuardedSuccessors(Expression guard) {
+			return successors;
+		}
+	}
+
+	/**
+	 * An implementation of {@link SuccessorInfo} that does distinguish between "true" and
+	 * "false" successors.
+	 */
+	private class SplitSuccessorInfo extends SuccessorInfo {
+		private final Object trueSuccessors;
+		private final Object falseSuccessors;
+
+		public SplitSuccessorInfo(Object trueSuccessors, Object falseSuccessors) {
+			this.trueSuccessors = trueSuccessors;
+			this.falseSuccessors = falseSuccessors;
+		}
+
+		@Override
+		public Object getSuccessors(boolean edge) {
+			return edge ? trueSuccessors : falseSuccessors;
+		}
+
+		@Override
+		public Object getAllSuccessors() {
+			return union(trueSuccessors, falseSuccessors);
+		}
+
+		@Override
+		public Object getGuardedSuccessors(Expression guard) {
+			Object trueGuard = addGuard(guard, true, trueSuccessors);
+			Object falseGuard = addGuard(guard, false, falseSuccessors);
+			return union(trueGuard, falseGuard);
+		}
+	}
+
+	/**
+	 * Create a guard node stating that {@code test} evaluates to {@code outcome},
+	 * with {@code succs} as its successors.
+	 *
+	 * We simplify guards based on the shape of {@code test}:
+	 * <ul>
+	 * <li>If {@code test} is a parenthesised expression {@code (a)}, we create a guard
+	 *     for {@code a} instead.</li>
+	 * <li>If {@code test} is a negated expression {@code !a}, we create the inverse guard
+	 *     for {@code a} instead.</li>
+	 * <li>If {@code test} is a sequence expression {@code a, b}, we create a guard
+	 *     for {@code b} instead.</li>
+	 * <li>Instead of asserting that {@code a && b} is {@code true}, we assert that {@code a} and
+	 *     {@code b} are {@code true}.</li>
+	 * <li>Instead of asserting that {@code a || b} is {@code false}, we assert that {@code a}
+	 *     and {@code b} are {@code false}.</li>
+	 * <li>We never assert that {@code a && b} is {@code false} or {@code a || b} is {@code true},
+	 *     since by themselves these guards are not very useful.</li>
+	 * </ul>
+	 *
+	 * It might seem that we do not need to do this simplification since guards are placed
+	 * bottom-up. However, the CFG for a logical negation <code>!a</code> is <code>a -&gt; !a</code>,
+	 * that is, <code>a</code> only has a single successor and does not immediately induce any
+	 * guard nodes. We can only add a guard for the entire <code>!a</code> expression, at which
+	 * point we will try to recover a condition involving <code>a</code> if possible.
+	 */
+	private Object addGuard(Expression test, boolean outcome, Object succs) {
+		if (test instanceof ParenthesizedExpression)
+			return addGuard(((ParenthesizedExpression) test).getExpression(), outcome, succs);
+
+		if (test instanceof UnaryExpression && "!".equals(((UnaryExpression) test).getOperator()))
+			return addGuard(((UnaryExpression) test).getArgument(), !outcome, succs);
+
+		if (test instanceof LogicalExpression) {
+			LogicalExpression log = (LogicalExpression) test;
+			String op = log.getOperator();
+			if (outcome && "&&".equals(op)) {
+				return addGuard(log.getLeft(), outcome, addGuard(log.getRight(), outcome, succs));
+			} else if (!outcome && "||".equals(op)) {
+				return addGuard(log.getLeft(), outcome, addGuard(log.getRight(), outcome, succs));
+			} else {
+				return succs;
+			}
+		}
+
+		if (test instanceof SequenceExpression) {
+			SequenceExpression seq = (SequenceExpression) test;
+			List<Expression> exprs = seq.getExpressions();
+			return addGuard(exprs.get(exprs.size()-1), outcome, succs);
+		}
+
+		Node guardNode = guardNode(test, outcome);
+		succ(guardNode, succs);
+		return guardNode;
+	}
+
+	/**
+	 * Generate guard nodes.
+	 */
+	private Node guardNode(Expression nd, boolean outcome) {
+		SourceLocation ndLoc = nd.getLoc();
+		Node result = new Node("Assertion", new SourceLocation(ndLoc.getSource(), ndLoc.getStart(), ndLoc.getEnd())) {
+			@Override public <Q, A> A accept(Visitor<Q, A> v, Q q) { return null; }
+		};
+		Label lbl = trapwriter.localID(result);
+		int kind = outcome ? 1 : 0;
+		trapwriter.addTuple("guard_node", lbl, kind, trapwriter.localID(nd));
+		locationManager.emitNodeLocation(result, lbl);
+		return result;
+	}
+
+	private class V extends DefaultVisitor<SuccessorInfo, Void> {
+		/**
+		 * The context stores relevant bits of syntactic context to be able to
+		 * resolve jumps.
+		 *
+		 * Every element in the context is either an AST node of type
+		 * `Program`, `FunctionDeclaration`, `FunctionExpression`, `ArrowFunctionExpression`,
+		 * `WhileStatement`, `DoWhileStatement`, `ForStatement`, `ForInStatement`, `ForOfStatement`,
+		 * `SwitchStatement`, `TryStatement`, `LabeledStatement` or a pseudo-node of type `Finally`.
+		 * The latter means that we are in the `catch` clause of a `try` statement that
+		 * has a `finally`.
+		 */
+		private final Stack<Node> ctxt = new Stack<Node>();
+
+		/**
+		 * Hoisted function declarations in the enclosing statement container
+		 * (function or script).
+		 */
+		private final Set<Identifier> hoistedFns = new LinkedHashSet<Identifier>();
+
+		/**
+		 * Hoisted import declarations in the enclosing script.
+		 *
+		 * In standard ECMAScript, all import declarations are hoisted. However, we support
+		 * non-toplevel import declarations, which are not hoisted.
+		 */
+		private final Set<ImportDeclaration> hoistedImports = new LinkedHashSet<ImportDeclaration>();
+
+		private class Finally extends Node {
+			private final BlockStatement body;
+
+			public Finally(SourceLocation loc, BlockStatement body) {
+				super("Finally", loc);
+				this.body = body;
+			}
+
+			@Override
+			public <Q, A> A accept(Visitor<Q, A> v, Q q) { return null; }
+		}
+
+		// associate statements with their (direct or indirect) labels
+		private final Map<Statement, Set<String>> loopLabels = new LinkedHashMap<Statement, Set<String>>();
+
+		// cache the set of normal control flow successors
+		private final Map<Node, Object> followingCache = new LinkedHashMap<Node, Object>();
+
+		/**
+		 * Generate entry node.
+		 */
+		private final HashMap<IStatementContainer, Node> entryNodeCache = new LinkedHashMap<IStatementContainer, Node>();
+		private Node entry(IStatementContainer nd) {
+			Node entry = entryNodeCache.get(nd);
+			if (entry == null) {
+				entry = new Node("Entry", new SourceLocation("", nd.getLoc().getStart(), nd.getLoc().getStart())) {
+					@Override public <Q, A> A accept(Visitor<Q, A> v, Q q) { return null; }
+				};
+				entryNodeCache.put(nd, entry);
+				Label lbl = trapwriter.localID(entry);
+				trapwriter.addTuple("entry_cfg_node", lbl, nd instanceof Program ? toplevelLabel : trapwriter.localID(nd));
+				locationManager.emitNodeLocation(entry, lbl);
+			}
+			return entry;
+		}
+
+		/**
+		 * Generate exit node.
+		 */
+		private final HashMap<IStatementContainer, Node> exitNodeCache = new LinkedHashMap<IStatementContainer, Node>();
+		private Node exit(IStatementContainer nd) {
+			Node exit = exitNodeCache.get(nd);
+			if (exit == null) {
+				exit = new Node("Exit", new SourceLocation("", nd.getLoc().getEnd(), nd.getLoc().getEnd())) {
+					@Override public <Q, A> A accept(Visitor<Q, A> v, Q q) { return null; }
+				};
+				Label lbl = trapwriter.localID(exit);
+				trapwriter.addTuple("exit_cfg_node", lbl, nd instanceof Program ? toplevelLabel : trapwriter.localID(nd));
+				locationManager.emitNodeLocation(exit, lbl);
+				exitNodeCache.put(nd, exit);
+			}
+			return exit;
+		}
+
+		/**
+		 * Find the target nodes of a jump by consulting the syntactic context.
+		 *
+		 * @param type the type of the jump
+		 * @param label for labelled `BreakStatement` and `ContinueStatement`, the target label;
+		 *              otherwise null
+		 */
+		private Object findTarget(final JumpType type, final String label) {
+			return new Object() {
+				private Object find(final int i) {
+					if (i < 0)
+						return null;
+
+					Node nd = ctxt.get(i);
+
+					if (nd instanceof Finally) {
+						BlockStatement finalizer = ((Finally)nd).body;
+						followingCache.put(finalizer, union(followingCache.get(finalizer), find(i-1)));
+						return First.of(finalizer);
+					}
+
+					return nd.accept(new DefaultVisitor<Void, Object>() {
+						@Override
+						public Object visit(Loop loop, Void v) {
+							Set<String> labels = loopLabels.computeIfAbsent(loop, k -> new LinkedHashSet<>());
+							if (type == JumpType.CONTINUE && (label == null || labels.contains(label)))
+								return First.of(loop.getContinueTarget());
+							else if (type == JumpType.BREAK && label == null)
+								return followingCache.get(loop);
+							return find(i-1);
+						}
+
+						@Override
+						public Object visit(SwitchStatement nd, Void v) {
+							if (type == JumpType.BREAK && label == null)
+								return followingCache.get(nd);
+							return find(i-1);
+						}
+
+						@Override
+						public Object visit(LabeledStatement nd, Void v) {
+							if (type == JumpType.BREAK && nd.getLabel().getName().equals(label))
+								return followingCache.get(nd);
+							return find(i-1);
+						}
+
+						@Override
+						public Object visit(TryStatement t, Void v) {
+							if (type == JumpType.THROW && !t.getAllHandlers().isEmpty()) {
+								return First.of(t.getAllHandlers().get(0));
+							}
+							if (t.hasFinalizer()) {
+								BlockStatement finalizer = t.getFinalizer();
+								followingCache.put(finalizer, union(followingCache.get(finalizer), find(i-1)));
+								return First.of(finalizer);
+							}
+							return find(i-1);
+						}
+
+						@Override
+						public Object visit(Program nd, Void v) {
+							return visit(nd);
+						}
+
+						@Override
+						public Object visit(IFunction nd, Void v) {
+							return visit(nd);
+						}
+
+						private Object visit(IStatementContainer nd) {
+							if (type == JumpType.RETURN)
+								return exit((IStatementContainer)nd);
+							return null;
+						}
+					}, null);
+				}
+			}.find(ctxt.size()-1);
+		}
+
+		private Node visit(Node nd, Object trueSuccessors, Object falseSuccessors) {
+			if (nd == null)
+				return null;
+
+			followingCache.put(nd, union(followingCache.get(nd), union(trueSuccessors, falseSuccessors)));
+			nd.accept(this, falseSuccessors == null ? new SimpleSuccessorInfo(trueSuccessors)
+			                                        : new SplitSuccessorInfo(trueSuccessors, falseSuccessors));
+			return First.of(nd);
+		}
+
+		private Object seq(Object... nodes) {
+			Object fst = nodes[nodes.length-1];
+			for (int i=nodes.length-2; i>=0; --i) {
+				for (Node node : hcaerof(nodes[i])) {
+					Node ffst = visit(node, fst, null);
+					if (ffst != null)
+						fst = ffst;
+				}
+			}
+			return fst;
+		}
+
+		@Override
+		public Void visit(Node nd, SuccessorInfo i) {
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(Expression nd, SuccessorInfo i) {
+			succ(nd, i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(Program nd, SuccessorInfo i) {
+			this.ctxt.push(nd);
+			Node entry = this.entry(nd);
+
+			List<ImportDeclaration> imports = scanImports(nd);
+			hoistedImports.addAll(imports);
+			List<ImportSpecifier> importSpecifiers = new ArrayList<>();
+			for (ImportDeclaration imp : imports)
+				importSpecifiers.addAll(imp.getSpecifiers());
+
+			List<Identifier> fns = HoistedFunDecls.of(nd);
+			hoistedFns.addAll(fns);
+
+			Object fst = this.seq(
+					importSpecifiers, fns,
+					nd.getBody(),
+					this.exit(nd)
+			);
+			succ(entry, fst);
+			this.ctxt.pop();
+			return null;
+		}
+
+		/**
+		 * Return a list of all {@link ImportDeclaration}s in the given program,
+		 * in lexical order.
+		 */
+		private List<ImportDeclaration> scanImports(Program p) {
+			List<ImportDeclaration> result = new ArrayList<>();
+			// import statements can only appear at the top-level
+			for (Statement s : p.getBody())
+				if (s instanceof ImportDeclaration)
+					result.add((ImportDeclaration) s);
+			return result;
+		}
+
+		/**
+		 * Builds the CFG for the creation of the given function as part of CFG the
+		 * enclosing container.
+		 */
+		private void buildFunctionCreation(IFunction nd, SuccessorInfo i) {
+			// `tail` is the last CFG node in the function creation
+			INode tail = nd;
+			if (!(nd instanceof AFunctionExpression) && !hoistedFns.contains(nd.getId())) {
+				succ(tail, nd.getId());
+				tail = nd.getId();
+			}
+			succ(tail, nd instanceof AFunctionExpression ? i.getSuccessors(true) : i.getAllSuccessors());
+		}
+
+		/**
+		 * Builds the CFG for the body of the given function.
+		 */
+		private void buildFunctionBody(IFunction nd) {
+			this.ctxt.push((Node)nd);
+
+			// build a list of all parameters and default expressions in order, with
+			// the default expressions preceding their corresponding parameter
+			List<Expression> paramsAndDefaults = new ArrayList<Expression>();
+			for (int j=0, n=nd.getParams().size(); j<n; ++j) {
+				if (nd.hasDefault(j))
+					paramsAndDefaults.add(nd.getDefault(j));
+				paramsAndDefaults.add((Expression)nd.getParams().get(j));
+			}
+			if (nd.hasRest())
+				paramsAndDefaults.add((Expression)nd.getRest());
+
+			Node entry = this.entry(nd);
+			List<Identifier> fns = HoistedFunDecls.of(nd);
+			hoistedFns.addAll(fns);
+
+			// if this is the constructor of a class without a superclass, we need to
+			// initialise all fields before running the body of the constructor
+			// (for classes with a superclass, that initialisation only happens after
+			// `super` calls)
+			AClass klass = constructor2Class.get(nd);
+			FieldDefinition firstField = null;
+			if (klass != null && !klass.hasSuperClass()) {
+				Pair<FieldDefinition, FieldDefinition> p = instanceFields.peek();
+				if (p != null) {
+					firstField = p.fst();
+					succ(p.snd(), First.of(nd.getBody()));
+				}
+			}
+
+			Object fst = this.seq(nd.getBody(), this.exit(nd));
+			if (firstField != null)
+				fst = First.of(firstField);
+			fst = this.seq(nd instanceof FunctionDeclaration ? null : nd.getId(),
+					paramsAndDefaults,
+					fns,
+					fst);
+			succ(entry, fst);
+
+			this.ctxt.pop();
+		}
+
+		@Override
+		public Void visit(IFunction nd, SuccessorInfo i) {
+			if (nd instanceof FunctionDeclaration && nd.hasDeclareKeyword()) {
+				// All 'declared' statements have a no-op CFG node, but their children should
+				// not be processed.
+				succ(nd, i.getAllSuccessors());
+				return null;
+			}
+			buildFunctionCreation(nd, i);
+			buildFunctionBody(nd);
+			return null;
+		}
+
+		@Override
+		public Void visit(ClassDeclaration nd, SuccessorInfo i) {
+			if (nd.hasDeclareKeyword()) {
+				succ(nd, i.getAllSuccessors());
+			} else {
+				visit(nd, nd.getClassDef(), i);
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(ClassExpression nd, SuccessorInfo i) {
+			return visit(nd, nd.getClassDef(), i);
+		}
+
+		private Map<Object, AClass> constructor2Class = new LinkedHashMap<>();
+
+		private Void visit(Node nd, AClass ac, SuccessorInfo i) {
+			for (MemberDefinition<?> m : ac.getBody().getBody())
+				if (m.isConstructor() && m.isConcrete())
+					constructor2Class.put(m.getValue(), ac);
+			seq(ac.getId(), ac.getSuperClass(), ac.getBody(), nd);
+			succ(nd, seq(getStaticFields(ac.getBody()), getDecoratorsOfClass(ac), i.getAllSuccessors()));
+			return null;
+		}
+
+		/**
+		 * Gets the decorators for the given member, including parameter decorators.
+		 *
+		 * The result is a tree of nested lists containing Decorator and DecoratorList
+		 * nodes at the leaves.
+		 */
+		private List<?> getMemberDecorators(MemberDefinition<?> member) {
+			if (member instanceof MethodDefinition) {
+				MethodDefinition method = (MethodDefinition) member;
+				return Arrays.asList(method.getValue().getParameterDecorators(), method.getDecorators());
+			} else {
+				return member.getDecorators();
+			}
+		}
+
+		/**
+		 * Returns all the decorators on the given class and its members in the order
+		 * the decorators are evaluated.
+		 * <p>
+		 * We don't model the call to each decorator, only the initial evaluation.
+		 * <p>
+		 * The result is a list of Decorator and DecoratorList nodes.
+		 */
+		private List<Node> getDecoratorsOfClass(AClass ac) {
+			List<Object> instanceDecorators = new ArrayList<>();
+			List<Object> staticDecorators = new ArrayList<>();
+			List<Object> constructorParameterDecorators = new ArrayList<>();
+			List<?> classDecorators = ac.getDecorators();
+			for (MemberDefinition<?> member : ac.getBody().getBody()) {
+				if (!member.isConcrete())
+					continue;
+				List<?> decorators = getMemberDecorators(member);
+				if (member.isConstructor()) {
+					constructorParameterDecorators.add(decorators);
+				} else if (member.isStatic()) {
+					staticDecorators.add(decorators);
+				} else {
+					instanceDecorators.add(decorators);
+				}
+			}
+			return flattenNestedList(Arrays.asList(instanceDecorators, staticDecorators, constructorParameterDecorators, classDecorators));
+		}
+
+		@Override
+		public Void visit(NamespaceDeclaration nd, SuccessorInfo i) {
+			if (nd.hasDeclareKeyword()) {
+				succ(nd, i.getAllSuccessors());
+			} else {
+				List<Identifier> hoisted = HoistedFunDecls.of(nd.getBody());
+				hoistedFns.addAll(hoisted);
+				succ(nd.getName(), nd);
+				succ(nd, seq(hoisted, nd.getBody(), i.getAllSuccessors()));
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(Literal nd, SuccessorInfo i) {
+			if (nd.isFalsy()) {
+				succ(nd, i.getSuccessors(false));
+			} else {
+				succ(nd, i.getSuccessors(true));
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(BlockStatement nd, SuccessorInfo i) {
+			if (nd.getBody().isEmpty())
+				succ(nd, i.getAllSuccessors());
+			else
+				succ(nd, First.of(nd.getBody().get(0)));
+			seq(nd.getBody(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(CatchClause nd, SuccessorInfo i) {
+			// check whether this is a guarded catch
+			if (nd.hasGuard()) {
+				// if so, the guard may fail and execution might continue with the next
+				// catch clause (if any)
+				succ(nd, nd.getParam());
+				this.seq(nd.getParam(), nd.getGuard(), union(First.of(nd.getBody()), i.getSuccessors(false)));
+				this.seq(nd.getBody(), i.getSuccessors(true));
+			} else {
+				// unguarded catch clauses always execute their body
+				if (nd.getParam() != null) {
+					succ(nd, nd.getParam());
+					this.seq(nd.getParam(), nd.getBody(), i.getAllSuccessors());
+				} else {
+					succ(nd, First.of(nd.getBody()));
+					this.seq(nd.getBody(), i.getAllSuccessors());
+				}
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(LabeledStatement nd, SuccessorInfo i) {
+			Set<String> ndLabels = loopLabels.computeIfAbsent(nd, k -> new LinkedHashSet<>()),
+					bodyLabels = loopLabels.computeIfAbsent(nd.getBody(), k -> new LinkedHashSet<>());
+			bodyLabels.addAll(ndLabels);
+			bodyLabels.add(nd.getLabel().getName());
+			succ(nd, First.of(nd.getBody()));
+			this.ctxt.push(nd);
+			this.seq(nd.getBody(), i.getAllSuccessors());
+			this.ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(ExpressionStatement nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getExpression()));
+			visit(nd.getExpression(), i.getAllSuccessors(), null);
+			return null;
+		}
+
+		@Override
+		public Void visit(ParenthesizedExpression nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getExpression()));
+			return nd.getExpression().accept(this, i);
+		}
+
+		@Override
+		public Void visit(IfStatement nd, SuccessorInfo i) {
+			Expression test = nd.getTest();
+			succ(nd, First.of(test));
+			Object following = i.getAllSuccessors();
+			visit(test,
+					First.of(nd.getConsequent()),
+					nd.hasAlternate() ? First.of(nd.getAlternate()) : following);
+			this.visit(nd.getConsequent(), following, null);
+			this.visit(nd.getAlternate(), following, null);
+			return null;
+		}
+
+		@Override
+		public Void visit(ConditionalExpression nd, SuccessorInfo i) {
+			Expression test = nd.getTest();
+			succ(nd, First.of(test));
+			visit(test, First.of(nd.getConsequent()), First.of(nd.getAlternate()));
+
+			nd.getConsequent().accept(this, i);
+			nd.getAlternate().accept(this, i);
+
+			return null;
+		}
+
+		@Override
+		public Void visit(JumpStatement nd, SuccessorInfo i) {
+			JumpType tp = nd instanceof BreakStatement ? JumpType.BREAK : JumpType.CONTINUE;
+			succ(nd, findTarget(tp, nd.hasLabel() ? nd.getLabel().getName() : null));
+			return null;
+		}
+
+		@Override
+		public Void visit(WithStatement nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getObject()));
+			seq(nd.getObject(), nd.getBody(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(SwitchStatement nd, SuccessorInfo i) {
+			this.ctxt.push(nd);
+			succ(nd, First.of(nd.getDiscriminant()));
+
+			// find all default cases (in a valid program there is
+			// only one, but we want to gracefully handle switches with
+			// multiple defaults)
+			Object deflt = null;
+			for (SwitchCase c : nd.getCases())
+				if (c.isDefault())
+					deflt = union(deflt, c);
+
+			// compute 'following' for every case label
+			outer:
+				for (int j=0, n=nd.getCases().size(); j<n; ++j) {
+					SwitchCase cse = nd.getCases().get(j);
+					if (cse.hasTest()) {
+						// find next non-default clause
+						for (int k=j+1; k<n; ++k) {
+							if (nd.getCases().get(k).hasTest()) {
+								followingCache.put(cse.getTest(), nd.getCases().get(k));
+								continue outer;
+							}
+						}
+
+						// if there isn't one, the default clause is next
+						if (deflt != null)
+							followingCache.put(cse.getTest(), deflt);
+						else
+							// if there is no default clause, execution continues after the `switch`
+							followingCache.put(cse.getTest(), i.getAllSuccessors());
+					}
+				}
+
+			if (nd.getCases().isEmpty())
+				this.visit(nd.getDiscriminant(), i.getAllSuccessors(), null);
+			else if (nd.getCases().size() > 1 && nd.getCases().get(0).isDefault())
+				this.visit(nd.getDiscriminant(), First.of(nd.getCases().get(1)), null);
+			else
+				this.visit(nd.getDiscriminant(), First.of(nd.getCases().get(0)), null);
+			this.seq(nd.getCases(), i.getAllSuccessors());
+			this.ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(SwitchCase nd, SuccessorInfo i) {
+			if (nd.hasTest())
+				succ(nd, First.of(nd.getTest()));
+			else if (!nd.getConsequent().isEmpty())
+				succ(nd, First.of(nd.getConsequent().get(0)));
+			else
+				succ(nd, followingCache.get(nd));
+			Object fst = followingCache.get(nd.getTest());
+			if (nd.getConsequent().isEmpty())
+				fst = union(i.getAllSuccessors(), fst);
+			else
+				fst = union(First.of(nd.getConsequent().get(0)), fst);
+			seq(nd.getTest(), fst);
+			seq(nd.getConsequent(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ReturnStatement nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			succ(nd, findTarget(JumpType.RETURN, null));
+			return null;
+		}
+
+		@Override
+		public Void visit(ThrowStatement nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			succ(nd, findTarget(JumpType.THROW, null));
+			return null;
+		}
+
+		@Override
+		public Void visit(TryStatement nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getBlock()));
+			if (nd.hasFinalizer())
+				followingCache.put(nd.getFinalizer(), i.getAllSuccessors());
+
+			ctxt.push(nd);
+			Object fst = nd.hasFinalizer() ? First.of(nd.getFinalizer()) : i.getAllSuccessors();
+			this.visit(nd.getBlock(), fst, null);
+			ctxt.pop();
+
+			if (nd.hasFinalizer())
+				ctxt.push(new Finally(nd.getFinalizer().getLoc(), nd.getFinalizer()));
+
+			for (int j=0, n=nd.getAllHandlers().size(); j<n; ++j)
+				visit(nd.getAllHandlers().get(j), fst, j+1<n ? nd.getAllHandlers().get(j+1) : null);
+
+			if (nd.hasFinalizer()) {
+				ctxt.pop();
+				visit(nd.getFinalizer(), followingCache.get(nd.getFinalizer()), null);
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(VariableDeclaration nd, SuccessorInfo i) {
+			if (nd.hasDeclareKeyword()) {
+				succ(nd, i.getAllSuccessors());
+			} else {
+				succ(nd, First.of(nd.getDeclarations().get(0)));
+				seq(nd.getDeclarations(), i.getAllSuccessors());
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(ImportWholeDeclaration nd, SuccessorInfo i) {
+			seq(nd.getLhs(), nd.getRhs(), nd);
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportWholeDeclaration nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getRhs()));
+			seq(nd.getRhs(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(LetStatement nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getHead().get(0)));
+			seq(nd.getHead(), nd.getBody(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(LetExpression nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getHead().get(0)));
+			seq(nd.getHead(), nd.getBody(), i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(WhileStatement nd, SuccessorInfo i) {
+			Expression test = nd.getTest();
+			Node testStart = First.of(test);
+			succ(nd, testStart);
+			ctxt.push(nd);
+			visit(nd.getBody(), testStart, null);
+			visit(test,
+					First.of(nd.getBody()),
+					i.getAllSuccessors());
+			ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(DoWhileStatement nd, SuccessorInfo i) {
+			Node body = First.of(nd.getBody());
+			succ(nd, body);
+			ctxt.push(nd);
+			Expression test = nd.getTest();
+			visit(nd.getBody(), First.of(test), null);
+			visit(test,
+					body,
+					i.getAllSuccessors());
+			ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(EnhancedForStatement nd, SuccessorInfo i) {
+			seq(nd.getRight(), nd);
+			succ(nd, First.of(nd.getLeft()));
+			succ(nd, i.getAllSuccessors());
+			ctxt.push(nd);
+			seq(nd.getLeft(), nd.getDefaultValue(), nd.getBody(), nd);
+			ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(ForStatement nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.hasInit() ? nd.getInit() : nd.hasTest() ? nd.getTest() : nd.getBody()));
+			ctxt.push(nd);
+			Node fst = First.of(nd.hasTest() ? nd.getTest() : nd.getBody());
+			visit(nd.getInit(), fst, null);
+
+			if (nd.hasTest()) {
+				Expression test = nd.getTest();
+				visit(test,
+						First.of(nd.getBody()),
+						i.getAllSuccessors());
+			}
+			seq(nd.getBody(), nd.getUpdate(), fst);
+			ctxt.pop();
+			return null;
+		}
+
+		@Override
+		public Void visit(SequenceExpression nd, SuccessorInfo i) {
+			List<Expression> expressions = nd.getExpressions();
+			succ(nd, First.of(expressions.get(0)));
+			int n = expressions.size()-1;
+			expressions.get(n).accept(this, i);
+			Node next = First.of(expressions.get(n));
+			while(--n>=0)
+				next = visit(expressions.get(n), next, null);
+			return null;
+		}
+
+		@Override
+		public Void visit(ArrayExpression nd, SuccessorInfo i) {
+			visitArrayLike(nd, nd.getElements(), i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ArrayPattern nd, SuccessorInfo i) {
+			// build a list of all pattern elements and default expressions in order, with
+			// the default expressions preceding their corresponding elements
+			List<Expression> elementsAndDefaults = new ArrayList<Expression>();
+			List<Expression> elements = nd.getElements();
+			List<Expression> defaults = nd.getDefaults();
+			for (int j=0, n=elements.size(); j<n; ++j) {
+				elementsAndDefaults.add(defaults.get(j));
+				elementsAndDefaults.add(elements.get(j));
+			}
+			if (nd.hasRest())
+				elementsAndDefaults.add(nd.getRest());
+
+			visitArrayLike(nd, elementsAndDefaults, i.getAllSuccessors());
+			return null;
+		}
+
+		public void visitArrayLike(Node nd, List<? extends INode> elements, Object following) {
+			// find the first non-omitted element
+			boolean foundNonOmitted = false;
+			for (INode element : elements)
+				if (element != null) {
+					// `nd` is followed by the first non-omitted element
+					foundNonOmitted = true;
+					succ(nd, First.of((Node)element));
+					break;
+				}
+
+			// if all elements are omitted, `nd` is immediately followed by `following`
+			if (!foundNonOmitted)
+				succ(nd, following);
+
+			seq(elements, following);
+		}
+
+		@Override
+		public Void visit(ObjectExpression nd, SuccessorInfo i) {
+			visitObjectLike(nd, nd.getProperties(), i);
+			return null;
+		}
+
+		@Override
+		public Void visit(ObjectPattern nd, SuccessorInfo i) {
+			List<Node> allProperties = new ArrayList<Node>();
+			allProperties.addAll(nd.getProperties());
+			if (nd.hasRest())
+				allProperties.add(nd.getRest());
+			visitObjectLike(nd, allProperties, i);
+			return null;
+		}
+
+		/**
+		 * For each enclosing class, this records the first and last non-abstract instance fields.
+		 */
+		private Stack<Pair<FieldDefinition, FieldDefinition>> instanceFields = new Stack<>();
+
+		@Override
+		public Void visit(ClassBody nd, SuccessorInfo i) {
+			List<FieldDefinition> fds = getConcreteInstanceFields(nd);
+			if (fds.isEmpty()) {
+				instanceFields.push(null);
+			} else {
+				seq(fds, null);
+				instanceFields.push(Pair.make(fds.get(0), fds.get(fds.size()-1)));
+			}
+			seq(getMethods(nd), i.getAllSuccessors());
+			instanceFields.pop();
+			return null;
+		}
+
+		private List<MemberDefinition<?>> getMethods(ClassBody nd) {
+			List<MemberDefinition<?>> mds = new ArrayList<>();
+			for (MemberDefinition<?> md : nd.getBody()) {
+				if (md instanceof MethodDefinition)
+					mds.add(md);
+			}
+			return mds;
+		}
+
+		private List<MemberDefinition<?>> getStaticFields(ClassBody nd) {
+			List<MemberDefinition<?>> mds = new ArrayList<>();
+			for (MemberDefinition<?> md : nd.getBody()) {
+				if (md instanceof FieldDefinition && md.isStatic())
+					mds.add(md);
+			}
+			return mds;
+		}
+
+		private List<FieldDefinition> getConcreteInstanceFields(ClassBody nd) {
+			List<FieldDefinition> fds = new ArrayList<>();
+			for (MemberDefinition<?> md : nd.getBody())
+				if (md instanceof FieldDefinition && !md.isStatic() && md.isConcrete())
+					fds.add((FieldDefinition) md);
+			return fds;
+		}
+
+		public Void visitObjectLike(Node nd, List<? extends Node> properties, SuccessorInfo i) {
+			if (properties.isEmpty())
+				succ(nd, i.getAllSuccessors());
+			else
+				succ(nd, First.of(properties.get(0)));
+			seq(properties, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(Property nd, SuccessorInfo i) {
+			this.seq(nd.getKey(), nd.getValue(), nd.getDefaultValue(), nd.getDecorators(), nd);
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(MemberDefinition<?> nd, SuccessorInfo i) {
+			if (nd.isConcrete() && !nd.isParameterField()) {
+				this.seq(nd.getKey(), nd.getValue(), nd);
+			}
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(AssignmentExpression nd, SuccessorInfo i) {
+			visitAssign(nd, nd.getLeft(), nd.getRight());
+			succ(nd, i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		protected void visitAssign(INode assgn, INode lhs, Expression rhs) {
+			if (lhs instanceof DestructuringPattern)
+				seq(rhs, lhs, assgn);
+			else
+				seq(lhs, rhs, assgn);
+		}
+
+		@Override
+		public Void visit(BinaryExpression nd, SuccessorInfo i) {
+			this.seq(nd.getLeft(), nd.getRight(), nd);
+			succ(nd, i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(VariableDeclarator nd, SuccessorInfo i) {
+			visitAssign(nd, nd.getId(), nd.getInit());
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		// special treatment of short-circuiting operators as explained above
+		@Override
+		public Void visit(LogicalExpression nd, SuccessorInfo i) {
+			Expression left = nd.getLeft();
+			succ(nd, First.of(left));
+			if ("&&".equals(nd.getOperator()))
+				visit(left,
+						First.of(nd.getRight()),
+						i.getSuccessors(false));
+			else
+				visit(left,
+						i.getSuccessors(true),
+						First.of(nd.getRight()));
+			nd.getRight().accept(this, i);
+			return null;
+		}
+
+		@Override
+		public Void visit(SpreadElement nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			succ(nd, i.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(UnaryExpression nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			succ(nd, i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(UpdateExpression nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			succ(nd, i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(YieldExpression nd, SuccessorInfo i) {
+			visit(nd.getArgument(), nd, null);
+			// yield expressions may throw
+			succ(nd, union(this.findTarget(JumpType.THROW, null), i.getGuardedSuccessors(nd)));
+			return null;
+		}
+
+		@Override
+		public Void visit(MemberExpression nd, SuccessorInfo i) {
+			seq(nd.getObject(), nd.getProperty(), nd);
+			// property accesses may throw
+			succ(nd, union(this.findTarget(JumpType.THROW, null), i.getGuardedSuccessors(nd)));
+			return null;
+		}
+
+		@Override
+		public Void visit(InvokeExpression nd, SuccessorInfo i) {
+			seq(nd.getCallee(), nd.getArguments(), nd);
+			Object succs = i.getGuardedSuccessors(nd);
+			if (nd instanceof CallExpression && nd.getCallee() instanceof Super && !instanceFields.isEmpty()) {
+				Pair<FieldDefinition, FieldDefinition> p = instanceFields.peek();
+				if (p != null) {
+					FieldDefinition firstField = p.fst();
+					FieldDefinition lastField = p.snd();
+					succ(lastField, succs);
+					succs = First.of(firstField);
+				}
+			}
+			// calls may throw
+			succ(nd, union(this.findTarget(JumpType.THROW, null), succs));
+			return null;
+		}
+
+		@Override
+		public Void visit(TaggedTemplateExpression nd, SuccessorInfo i) {
+			succ(nd, First.of(nd.getTag()));
+			seq(nd.getTag(), nd.getQuasi(), i.getGuardedSuccessors(nd));
+			return null;
+		}
+
+		@Override
+		public Void visit(TemplateLiteral nd, SuccessorInfo i) {
+			if (nd.getChildren().isEmpty()) {
+				succ(nd, i.getSuccessors(false));
+			} else {
+				succ(nd, First.of(nd.getChildren().get(0)));
+				seq(nd.getChildren(), i.getGuardedSuccessors(nd));
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(ComprehensionExpression nd, SuccessorInfo i) {
+			succ(nd, visitComprehensionBlock(nd, 0, i.getSuccessors(true)));
+			return null;
+		}
+
+		private Node visitComprehensionBlock(ComprehensionExpression nd, int i, Object follow) {
+			int n = nd.getBlocks().size();
+			if (i >= n) {
+				return visitComprehensionFilter(nd, follow);
+			} else {
+				ComprehensionBlock block = nd.getBlocks().get(i);
+				succ(block, First.of(block.getRight()));
+				follow = union(First.of((Node)block.getLeft()), follow);
+				seq(block.getRight(), follow);
+				seq(block.getLeft(), visitComprehensionBlock(nd, i+1, follow));
+				return First.of(block);
+			}
+		}
+
+		private Node visitComprehensionFilter(ComprehensionExpression nd, Object follow) {
+			if (nd.hasFilter()) {
+				visit(nd.getFilter(), visitComprehensionBody(nd, follow), follow);
+				return First.of(nd.getFilter());
+			} else {
+				return visitComprehensionBody(nd, follow);
+			}
+		}
+
+		private Node visitComprehensionBody(ComprehensionExpression nd, Object back) {
+			seq(nd.getBody(), back);
+			return First.of(nd.getBody());
+		}
+
+		@Override
+		public Void visit(ExportAllDeclaration nd, SuccessorInfo c) {
+			succ(nd, First.of(nd.getSource()));
+			seq(nd.getSource(), c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportDefaultDeclaration nd, SuccessorInfo c) {
+			succ(nd, First.of(nd.getDeclaration()));
+			seq(nd.getDeclaration(), c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportNamedDeclaration nd, SuccessorInfo c) {
+			if (nd.hasDeclaration()) {
+				succ(nd, First.of(nd.getDeclaration()));
+				seq(nd.getDeclaration(), c.getAllSuccessors());
+			} else if (nd.hasSource()) {
+				succ(nd, First.of(nd.getSource()));
+				seq(nd.getSource(), nd.getSpecifiers(), c.getAllSuccessors());
+			} else if (nd.getSpecifiers().isEmpty()) {
+				succ(nd, c.getAllSuccessors());
+			} else {
+				succ(nd, First.of(nd.getSpecifiers().get(0)));
+				seq(nd.getSpecifiers(), c.getAllSuccessors());
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportSpecifier nd, SuccessorInfo c) {
+			succ(nd, First.of(nd.getLocal()));
+			seq(nd.getLocal(), nd.getExported(), c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportDefaultSpecifier nd, SuccessorInfo c) {
+			succ(nd, First.of(nd.getExported()));
+			seq(nd.getExported(), c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ExportNamespaceSpecifier nd, SuccessorInfo c) {
+			succ(nd, First.of(nd.getExported()));
+			seq(nd.getExported(), c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(ImportDeclaration nd, SuccessorInfo c) {
+			if (hoistedImports.contains(nd) || nd.getSpecifiers().isEmpty()) {
+				succ(nd, c.getAllSuccessors());
+			} else {
+				succ(nd, First.of(nd.getSpecifiers().get(0)));
+				seq(nd.getSpecifiers(), c.getAllSuccessors());
+			}
+			return null;
+		}
+
+		@Override
+		public Void visit(ImportSpecifier nd, SuccessorInfo c) {
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXElement nd, SuccessorInfo c) {
+			JSXOpeningElement open = nd.getOpeningElement();
+			IJSXName name = open.getName();
+			if (name == null)
+				seq(nd.getChildren(), nd);
+			else
+				seq(name, open.getAttributes(), nd.getChildren(), nd);
+			succ(nd, c.getSuccessors(true));
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXMemberExpression nd, SuccessorInfo c) {
+			seq(nd.getObject(), nd.getName(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXNamespacedName nd, SuccessorInfo c) {
+			seq(nd.getNamespace(), nd.getName(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXAttribute nd, SuccessorInfo c) {
+			seq(nd.getName(), nd.getValue(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXSpreadAttribute nd, SuccessorInfo c) {
+			visit(nd.getArgument(), nd, null);
+			Label propkey = trapwriter.localID(nd, "JSXSpreadAttribute");
+			Label spreadkey = trapwriter.localID(nd);
+			trapwriter.addTuple("successor", spreadkey, propkey);
+			for (Node succ : foreach(c.getAllSuccessors()))
+				succ(propkey, succ);
+			return null;
+		}
+
+		@Override
+		public Void visit(JSXExpressionContainer nd, SuccessorInfo c) {
+			return nd.getExpression().accept(this, c);
+		}
+
+		@Override
+		public Void visit(AwaitExpression nd, SuccessorInfo c) {
+			seq(nd.getArgument(), nd);
+			// `await` may throw
+			succ(nd, union(this.findTarget(JumpType.THROW, null), c.getGuardedSuccessors(nd)));
+			return null;
+		}
+
+		@Override
+		public Void visit(Decorator nd, SuccessorInfo c) {
+			seq(nd.getExpression(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(BindExpression nd, SuccessorInfo c) {
+			seq(nd.getObject(), nd.getCallee(), nd);
+			succ(nd, c.getSuccessors(true));
+			return null;
+		}
+
+		@Override
+		public Void visit(ExternalModuleReference nd, SuccessorInfo c) {
+			seq(nd.getExpression(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(DynamicImport nd, SuccessorInfo c) {
+			seq(nd.getSource(), nd);
+			succ(nd, c.getSuccessors(true));
+			return null;
+		}
+
+		@Override
+		public Void visit(ExpressionWithTypeArguments nd, SuccessorInfo c) {
+			seq(nd.getExpression(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(TypeAssertion nd, SuccessorInfo c) {
+			seq(nd.getExpression(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(NonNullAssertion nd, SuccessorInfo c) {
+			seq(nd.getExpression(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(EnumDeclaration nd, SuccessorInfo c) {
+			seq(nd.getId(), nd.getMembers(), nd.getDecorators(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(EnumMember nd, SuccessorInfo c) {
+			seq(nd.getId(), nd.getInitializer(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+
+		@Override
+		public Void visit(DecoratorList nd, SuccessorInfo c) {
+			seq(nd.getDecorators(), nd);
+			succ(nd, c.getAllSuccessors());
+			return null;
+		}
+	}
+
+	public void extract(Node nd) {
+		nd.accept(new V(), new SimpleSuccessorInfo(null));
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/DeclaredNames.java b/javascript/extractor/src/com/semmle/js/extractor/DeclaredNames.java
new file mode 100644
index 00000000000..3215be28d3d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/DeclaredNames.java
@@ -0,0 +1,41 @@
+package com.semmle.js.extractor;
+
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+/**
+ * Names of variables, types, and namespaces declared in a particular scope.
+ */
+public class DeclaredNames {
+	private Set<String> variableNames;
+	private Set<String> typeNames;
+	private Set<String> namespaceNames;
+
+	public DeclaredNames() {
+		this.variableNames = new LinkedHashSet<String>();
+		this.typeNames = new LinkedHashSet<String>();
+		this.namespaceNames = new LinkedHashSet<String>();
+	}
+
+	public DeclaredNames(Set<String> variableNames, Set<String> typeNames, Set<String> namespaceNames) {
+		this.variableNames = variableNames;
+		this.typeNames = typeNames;
+		this.namespaceNames = namespaceNames;
+	}
+
+	public boolean isEmpty() {
+		return variableNames.isEmpty() && typeNames.isEmpty() && namespaceNames.isEmpty();
+	}
+
+	public Set<String> getVariableNames() {
+		return variableNames;
+	}
+
+	public Set<String> getTypeNames() {
+		return typeNames;
+	}
+
+	public Set<String> getNamespaceNames() {
+		return namespaceNames;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ExprKinds.java b/javascript/extractor/src/com/semmle/js/extractor/ExprKinds.java
new file mode 100644
index 00000000000..d1cf7ecb27c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ExprKinds.java
@@ -0,0 +1,273 @@
+package com.semmle.js.extractor;
+
+import java.util.EnumMap;
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.semmle.jcorn.TokenType;
+import com.semmle.jcorn.jsx.JSXParser;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.ComprehensionBlock;
+import com.semmle.js.ast.ComprehensionExpression;
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.DynamicImport;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.LogicalExpression;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.js.extractor.ASTExtractor.IdContext;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.util.exception.CatastrophicError;
+
+/**
+ * Map from SpiderMonkey expression types to the numeric kinds used in the DB scheme.
+ */
+public class ExprKinds {
+	private static final Map<String, Integer> binOpKinds = new LinkedHashMap<String, Integer>();
+	static {
+		binOpKinds.put("==", 23);
+		binOpKinds.put("!=", 24);
+		binOpKinds.put("===", 25);
+		binOpKinds.put("!==", 26);
+		binOpKinds.put("<", 27);
+		binOpKinds.put("<=", 28);
+		binOpKinds.put(">", 29);
+		binOpKinds.put(">=", 30);
+		binOpKinds.put("<<", 31);
+		binOpKinds.put(">>", 32);
+		binOpKinds.put(">>>", 33);
+		binOpKinds.put("+", 34);
+		binOpKinds.put("-", 35);
+		binOpKinds.put("*", 36);
+		binOpKinds.put("/", 37);
+		binOpKinds.put("%", 38);
+		binOpKinds.put("|", 39);
+		binOpKinds.put("^", 40);
+		binOpKinds.put("&", 41);
+		binOpKinds.put("in", 42);
+		binOpKinds.put("instanceof", 43);
+		binOpKinds.put("&&", 44);
+		binOpKinds.put("||", 45);
+		binOpKinds.put("=", 47);
+		binOpKinds.put("+=", 48);
+		binOpKinds.put("-=", 49);
+		binOpKinds.put("*=", 50);
+		binOpKinds.put("/=", 51);
+		binOpKinds.put("%=", 52);
+		binOpKinds.put("<<=", 53);
+		binOpKinds.put(">>=", 54);
+		binOpKinds.put(">>>=", 55);
+		binOpKinds.put("|=", 56);
+		binOpKinds.put("^=", 57);
+		binOpKinds.put("&=", 58);
+		binOpKinds.put("**", 87);
+		binOpKinds.put("**=", 88);
+	}
+
+	private static final Map<String, Integer> unOpKinds = new LinkedHashMap<String, Integer>();
+	static {
+		unOpKinds.put("-", 16);
+		unOpKinds.put("+", 17);
+		unOpKinds.put("!", 18);
+		unOpKinds.put("~", 19);
+		unOpKinds.put("typeof", 20);
+		unOpKinds.put("void", 21);
+		unOpKinds.put("delete", 22);
+	}
+
+	private static final Map<String, Integer> prefixOpKinds = new LinkedHashMap<String, Integer>();
+	static {
+		prefixOpKinds.put("++", 59);
+		prefixOpKinds.put("--", 61);
+	}
+
+	private static final Map<String, Integer> postfixOpKinds = new LinkedHashMap<String, Integer>();
+	static {
+		postfixOpKinds.put("++", 60);
+		postfixOpKinds.put("--", 62);
+	}
+
+	private static final Map<String, Integer> exprKinds = new LinkedHashMap<String, Integer>();
+	static {
+		exprKinds.put("ArrayExpression", 7);
+		exprKinds.put("CallExpression", 13);
+		exprKinds.put("ConditionalExpression", 11);
+		exprKinds.put("FunctionExpression", 9);
+		exprKinds.put("NewExpression", 12);
+		exprKinds.put("ObjectExpression", 8);
+		exprKinds.put("SequenceExpression", 10);
+		exprKinds.put("ThisExpression", 6);
+		exprKinds.put("ParenthesizedExpression", 63);
+		exprKinds.put("VariableDeclarator", 64);
+		exprKinds.put("ArrowFunctionExpression", 65);
+		exprKinds.put("SpreadElement", 66);
+		exprKinds.put("ArrayPattern", 67);
+		exprKinds.put("ObjectPattern", 68);
+		exprKinds.put("YieldExpression", 69);
+		exprKinds.put("TaggedTemplateExpression", 70);
+		exprKinds.put("TemplateLiteral", 71);
+		exprKinds.put("TemplateElement", 72);
+		exprKinds.put("LetExpression", 77);
+		exprKinds.put("ClassExpression", 80);
+		exprKinds.put("Super", 81);
+		exprKinds.put("ImportSpecifier", 83);
+		exprKinds.put("ImportDefaultSpecifier", 84);
+		exprKinds.put("ImportNamespaceSpecifier", 85);
+		exprKinds.put("ExportSpecifier", 86);
+		exprKinds.put("JSXElement", 89);
+		exprKinds.put("JSXNamespacedName", 90);
+		exprKinds.put("JSXEmptyExpression", 91);
+		exprKinds.put("AwaitExpression", 92);
+		exprKinds.put("Decorator", 94);
+		exprKinds.put("ExportDefaultSpecifier", 95);
+		exprKinds.put("ExportNamespaceSpecifier", 96);
+		exprKinds.put("BindExpression", 97);
+		exprKinds.put("ExternalModuleReference", 98);
+		exprKinds.put("NonNullAssertion", 105);
+	}
+
+	private static final Map<IdContext, Integer> idKinds = new EnumMap<IdContext, Integer>(IdContext.class);
+	static {
+		idKinds.put(IdContext.label, 0);
+		idKinds.put(IdContext.varDecl, 78);
+		idKinds.put(IdContext.varAndTypeDecl, 78);
+		idKinds.put(IdContext.namespaceDecl, 78);
+		idKinds.put(IdContext.varAndNamespaceDecl, 78);
+		idKinds.put(IdContext.varAndTypeAndNamespaceDecl, 78);
+		idKinds.put(IdContext.varBind, 79);
+		idKinds.put(IdContext.export, 103);
+		idKinds.put(IdContext.exportBase, 103);
+	}
+
+	public static int getExprKind(final Expression expr, final IdContext idContext) {
+		Integer kind = expr.accept(new DefaultVisitor<Void, Integer>() {
+			@Override
+			public Integer visit(Expression nd, Void q) {
+				return exprKinds.get(nd.getType());
+			}
+
+			@Override
+			public Integer visit(AssignmentExpression nd, Void q) {
+				return binOpKinds.get(nd.getOperator());
+			}
+
+			@Override
+			public Integer visit(BinaryExpression nd, Void q) {
+				return binOpKinds.get(nd.getOperator());
+			}
+
+			@Override
+			public Integer visit(Identifier nd, Void c) {
+				return idKinds.get(idContext);
+			}
+
+			@Override
+			public Integer visit(JSXIdentifier nd, Void c) {
+				return visit((Identifier) nd, c);
+			}
+
+			@Override
+			public Integer visit(LogicalExpression nd, Void q) {
+				return binOpKinds.get(nd.getOperator());
+			}
+
+			@Override
+			public Integer visit(Literal nd, Void q) {
+				TokenType tp = nd.getTokenType();
+
+				if (tp == TokenType._null)
+					return 1;
+				if (tp == TokenType._true || tp == TokenType._false)
+					return 2;
+				if (tp == TokenType.num)
+					return 3;
+				if (tp == TokenType.string || tp == JSXParser.jsxText)
+					return 4;
+				if (tp == TokenType.regexp)
+					return 5;
+				if (tp == TokenType.bigint)
+					return 106;
+
+				throw new CatastrophicError("Unexpected literal with token type " + tp.label);
+			}
+
+			@Override
+			public Integer visit(MemberExpression nd, Void q) {
+				return nd.isComputed() ? 15 : 14;
+			}
+
+			@Override
+			public Integer visit(JSXMemberExpression nd, Void c) {
+				// treat JSX member expressions as dot expressions
+				return 14;
+			}
+
+			@Override
+			public Integer visit(JSXSpreadAttribute nd, Void c) {
+				// treat JSX spread attributes as spread elements
+				return exprKinds.get("SpreadElement");
+			}
+
+			@Override
+			public Integer visit(UnaryExpression nd, Void q) {
+				return unOpKinds.get(nd.getOperator());
+			}
+
+			@Override
+			public Integer visit(UpdateExpression nd, Void q) {
+				return nd.isPrefix() ? prefixOpKinds.get(nd.getOperator())
+				                     : postfixOpKinds.get(nd.getOperator());
+			}
+
+			@Override
+			public Integer visit(ComprehensionExpression nd, Void q) {
+				return nd.isGenerator() ? 74 : 73;
+			}
+
+			@Override
+			public Integer visit(ComprehensionBlock nd, Void q) {
+				return nd.isOf() ? 76 : 75;
+			}
+
+			@Override
+			public Integer visit(MetaProperty nd, Void c) {
+				if (nd.getMeta().getName().equals("new"))
+					return 82; // @newtargetexpr
+				return 93; // @functionsentexpr
+			}
+
+			@Override
+			public Integer visit(DynamicImport nd, Void c) {
+				return 99;
+			}
+
+			@Override
+			public Integer visit(ExpressionWithTypeArguments nd, Void c) {
+				return 100;
+			}
+
+			@Override
+			public Integer visit(TypeAssertion nd, Void c) {
+				return nd.isAsExpression() ? 102 : 101;
+			}
+
+			@Override
+			public Integer visit(DecoratorList nd, Void c) {
+				return 104;
+			}
+		}, null);
+		if (kind == null)
+			throw new CatastrophicError("Unsupported expression kind: " + expr.getClass());
+		return kind;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ExtractorConfig.java b/javascript/extractor/src/com/semmle/js/extractor/ExtractorConfig.java
new file mode 100644
index 00000000000..9eb384db63a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ExtractorConfig.java
@@ -0,0 +1,376 @@
+package com.semmle.js.extractor;
+
+import java.nio.charset.Charset;
+import java.nio.charset.IllegalCharsetNameException;
+import java.nio.charset.StandardCharsets;
+import java.nio.charset.UnsupportedCharsetException;
+
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.exception.UserError;
+
+
+/**
+ * Configuration options that affect the behaviour of the extractor.
+ *
+ * <p>
+ * The intended invariants are:
+ * </p>
+ * <ol>
+ *   <li> If the extractor is invoked twice on the same file (contents and path both the same)
+ *      with the same configuration options, it will produce exactly the same TRAP files.</li>
+ *
+ *   <li> If the extractor is invoked on two files that have the same content, but whose path
+ *      (and file extension) may be different, and the two invocations have the same configuration
+ *      options, then the trap files it produces are identical from label #20000 onwards.
+ *      (See comments on the trap cache below for further explanation.)</li>
+ * </ol>
+ */
+public class ExtractorConfig {
+    public static enum ECMAVersion {
+        ECMA3(3), ECMA5(5), ECMA2015(2015, 6), ECMA2016(2016, 7), ECMA2017(2017, 8), ECMA2018(2018, 9),
+        ECMA2019(2019, 10);
+
+        private final int version;
+        public final int legacyVersion;
+
+        private ECMAVersion(int version, int legacyVersion) {
+            this.version = version;
+            this.legacyVersion = legacyVersion;
+        }
+
+        private ECMAVersion(int version) {
+            this(version, version);
+        }
+
+        public static ECMAVersion of(int version) {
+            for (ECMAVersion v : values())
+                if (v.version == version || v.legacyVersion == version)
+                    return v;
+            return null;
+        }
+    };
+
+    public static enum SourceType {
+        SCRIPT, MODULE, AUTO;
+
+        @Override
+        public String toString() {
+            return StringUtil.lc(name());
+        }
+    };
+
+    public static enum Platform {
+        WEB, NODE, AUTO;
+
+        @Override
+        public String toString() {
+            return StringUtil.lc(name());
+        }
+    }
+
+    /**
+     * How to handle HTML files.
+     */
+    public static enum HTMLHandling {
+        /** Only extract embedded scripts, not the HTML itself. */
+        SCRIPTS(false, false),
+        /** Only extract elements and embedded scripts, not text. */
+        ELEMENTS(true, false),
+        /** Extract elements, embedded scripts, and text. */
+        ALL(true, true)
+        ;
+
+        private final boolean extractElements;
+
+        private final boolean extractText;
+
+        private HTMLHandling(boolean extractElements, boolean extractText) {
+            this.extractElements = extractElements;
+            this.extractText = extractText;
+        }
+
+        public boolean extractElements() {
+            return extractElements;
+        }
+
+        public boolean extractText() {
+            return extractText;
+        }
+
+        public boolean extractComments() {
+            return extractElements;
+        }
+
+        @Override
+        public String toString() {
+            return StringUtil.lc(name());
+        }
+    }
+
+    /** Which language version is the source code parsed as? */
+    private ECMAVersion ecmaVersion;
+
+    /** Is this code parsed as externs definitions? */
+    private boolean externs;
+
+    /** Which {@link Platform} is this code meant to be running on? */
+    private Platform platform;
+
+    /** Should Mozilla-specific language extensions be supported? */
+    private boolean mozExtensions;
+
+    /** Should JScript language extensions be supported? */
+    private boolean jscript;
+
+    /** Should JSX be supported? */
+    private boolean jsx;
+
+    /** Should unfinished ECMAScript proposals be supported? */
+    private boolean esnext;
+
+    /** Should v8-specific language extensions be supported? */
+    private boolean v8Extensions;
+
+    /** Should parse errors be reported as violations instead of aborting extraction? */
+    private boolean tolerateParseErrors;
+
+    /** How should HTML files be extracted? */
+    private HTMLHandling htmlHandling;
+
+    /**
+     * Which {@link FileExtractor.FileType} should this code be parsed as?
+     *
+     * If this is {@code null}, the file type is inferred from the file extension. */
+    private String fileType;
+
+    /** Which {@link SourceType} should this code be parsed as? */
+    private SourceType sourceType;
+
+    /** Should textual information be extracted into the lines/4 relation? */
+    private boolean extractLines;
+
+    /** Should TypeScript files be extracted? */
+    private TypeScriptMode typescriptMode;
+
+    /** Override amount of RAM to allocate to the TypeScript compiler. */
+    private int typescriptRam;
+
+    /** The default character encoding to use for parsing source files. */
+    private String defaultEncoding;
+
+    public ExtractorConfig(boolean experimental) {
+        this.ecmaVersion = experimental ? ECMAVersion.ECMA2019 : ECMAVersion.ECMA2018;
+        this.platform = Platform.AUTO;
+        this.jsx = true;
+        this.sourceType = SourceType.SCRIPT;
+        this.htmlHandling = HTMLHandling.ELEMENTS;
+        this.tolerateParseErrors = true;
+        if (experimental) {
+            this.mozExtensions = true;
+            this.jscript = true;
+            this.esnext = true;
+            this.v8Extensions = true;
+        }
+        this.defaultEncoding = StandardCharsets.UTF_8.name();
+    }
+
+    public ExtractorConfig(ExtractorConfig that) {
+        this.ecmaVersion = that.ecmaVersion;
+        this.externs = that.externs;
+        this.platform = that.platform;
+        this.mozExtensions = that.mozExtensions;
+        this.jscript = that.jscript;
+        this.jsx = that.jsx;
+        this.esnext = that.esnext;
+        this.v8Extensions = that.v8Extensions;
+        this.tolerateParseErrors = that.tolerateParseErrors;
+        this.fileType = that.fileType;
+        this.sourceType = that.sourceType;
+        this.htmlHandling = that.htmlHandling;
+        this.extractLines = that.extractLines;
+        this.typescriptMode = that.typescriptMode;
+        this.typescriptRam = that.typescriptRam;
+        this.defaultEncoding = that.defaultEncoding;
+    }
+
+    public ECMAVersion getEcmaVersion() {
+        return ecmaVersion;
+    }
+
+    public ExtractorConfig withEcmaVersion(ECMAVersion ecmaVersion) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.ecmaVersion = ecmaVersion;
+        return res;
+    }
+
+    public boolean isExterns() {
+        return externs;
+    }
+
+    public ExtractorConfig withExterns(boolean externs) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.externs = externs;
+        return res;
+    }
+
+    public Platform getPlatform() {
+        return platform;
+    }
+
+    public ExtractorConfig withPlatform(Platform platform) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.platform = platform;
+        return res;
+    }
+
+    public boolean isJscript() {
+        return jscript;
+    }
+
+    public ExtractorConfig withJscript(boolean jscript) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.jscript = jscript;
+        return res;
+    }
+
+    public boolean isMozExtensions() {
+        return mozExtensions;
+    }
+
+    public ExtractorConfig withMozExtensions(boolean mozExtensions) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.mozExtensions = mozExtensions;
+        return res;
+    }
+
+    public boolean isEsnext() {
+        return esnext;
+    }
+
+    public ExtractorConfig withEsnext(boolean esnext) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.esnext = esnext;
+        return res;
+    }
+
+    public boolean isV8Extensions() {
+        return v8Extensions;
+    }
+
+    public ExtractorConfig withV8Extensions(boolean v8Extensions) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.v8Extensions = v8Extensions;
+        return res;
+    }
+
+    public boolean isTolerateParseErrors() {
+        return tolerateParseErrors;
+    }
+
+    public ExtractorConfig withTolerateParseErrors(boolean tolerateParseErrors) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.tolerateParseErrors = tolerateParseErrors;
+        return res;
+    }
+
+    public boolean hasFileType() {
+        return fileType != null;
+    }
+
+    public String getFileType() {
+        return fileType;
+    }
+
+    public ExtractorConfig withFileType(String fileType) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.fileType = fileType;
+        return res;
+    }
+
+    public SourceType getSourceType() {
+        return sourceType;
+    }
+
+    public ExtractorConfig withSourceType(SourceType sourceType) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.sourceType = sourceType;
+        return res;
+    }
+
+    public boolean isJsx() {
+        return jsx;
+    }
+
+    public ExtractorConfig withJsx(boolean jsx) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.jsx = jsx;
+        return res;
+    }
+
+    public HTMLHandling getHtmlHandling() {
+        return htmlHandling;
+    }
+
+    public ExtractorConfig withHtmlHandling(HTMLHandling htmlHandling) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.htmlHandling = htmlHandling;
+        return res;
+    }
+
+    public boolean getExtractLines() {
+        return extractLines;
+    }
+
+    public ExtractorConfig withExtractLines(boolean extractLines) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.extractLines = extractLines;
+        return res;
+    }
+
+    public TypeScriptMode getTypeScriptMode() {
+        return typescriptMode;
+    }
+
+    public int getTypeScriptRam() {
+        return typescriptRam;
+    }
+
+    public ExtractorConfig withTypeScriptMode(TypeScriptMode typescriptMode) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.typescriptMode = typescriptMode;
+        return res;
+    }
+
+    public ExtractorConfig withTypeScriptRam(int ram) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        res.typescriptRam = ram;
+        return res;
+    }
+
+    public String getDefaultEncoding() {
+        return defaultEncoding;
+    }
+
+    public ExtractorConfig withDefaultEncoding(String defaultEncoding) {
+        ExtractorConfig res = new ExtractorConfig(this);
+        try {
+            res.defaultEncoding = Charset.forName(defaultEncoding).name();
+        } catch(IllegalCharsetNameException | UnsupportedCharsetException e) {
+            throw new UserError("Unsupported encoding " + defaultEncoding + ".", e);
+        }
+        return res;
+    }
+
+    @Override
+    public String toString() {
+        return "ExtractorConfig [ecmaVersion=" + ecmaVersion + ", externs="
+                + externs + ", platform=" + platform + ", mozExtensions="
+                + mozExtensions + ", jscript=" + jscript + ", jsx=" + jsx
+                + ", esnext=" + esnext + ", v8Extensions=" + v8Extensions
+                + ", tolerateParseErrors=" + tolerateParseErrors
+                + ", htmlHandling=" + htmlHandling + ", fileType=" + fileType
+                + ", sourceType=" + sourceType + ", extractLines="
+                + extractLines + ", typescript=" + typescriptMode
+                + ", defaultEncoding=" + defaultEncoding + "]";
+    }
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ExtractorState.java b/javascript/extractor/src/com/semmle/js/extractor/ExtractorState.java
new file mode 100644
index 00000000000..b7e56c2b364
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ExtractorState.java
@@ -0,0 +1,33 @@
+package com.semmle.js.extractor;
+
+import com.semmle.js.parser.TypeScriptParser;
+
+/**
+ * Contains the state to be shared between extractions of different files.
+ * <p>
+ * In general, this contains both semantic state that affects the extractor
+ * output as well as shared resources that are simply expensive to reacquire.
+ * <p>
+ * The {@link #reset()} method resets the semantic state while retaining shared
+ * resources when possible.
+ * <p>
+ * Concretely, the shared resource is the Node.js process running the TypeScript
+ * compiler, which is expensive to restart. The semantic state is the set of
+ * projects currently open in that process, which affects the type information
+ * obtained during extraction of a file.
+ */
+public class ExtractorState {
+	private TypeScriptParser typeScriptParser = new TypeScriptParser();
+
+	public TypeScriptParser getTypeScriptParser() {
+		return typeScriptParser;
+	}
+
+	/**
+	 * Makes this semantically equivalent to a fresh state, but may internally
+	 * retain shared resources that are expensive to reacquire.
+	 */
+	public void reset() {
+		typeScriptParser.reset();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/FileExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/FileExtractor.java
new file mode 100644
index 00000000000..1be577c04ae
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/FileExtractor.java
@@ -0,0 +1,470 @@
+package com.semmle.js.extractor;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import com.semmle.js.extractor.trapcache.CachingTrapWriter;
+import com.semmle.js.extractor.trapcache.ITrapCache;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.extraction.ExtractorOutputConfig;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.io.WholeIO;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * The file extractor extracts a single file and handles source archive population and TRAP caching;
+ * it delegates to the appropriate {@link IExtractor} for extracting the contents of the file.
+ */
+public class FileExtractor {
+	/**
+	 * Pattern to use on the shebang line of a script to identify whether it is a Node.js script.
+	 *
+	 * There are many different ways of invoking the Node.js interpreter (directly, through
+	 * {@code env}, with or without flags, with or without modified environment, etc.), so we
+	 * simply look for the word {@code "node"} or {@code "nodejs"}.
+	 */
+	private static final Pattern NODE_INVOCATION = Pattern.compile("\\bnode(js)?\\b");
+
+	/**
+	 * A pattern that matches strings starting with `{ "...":`, suggesting JSON data.
+	 */
+	public static final Pattern JSON_OBJECT_START = Pattern.compile("^(?s)\\s*\\{\\s*\"([^\"]|\\\\.)*\"\\s*:.*");
+
+	/**
+	 * Information about supported file types.
+	 */
+	public static enum FileType {
+		HTML(".htm", ".html", ".xhtm", ".xhtml", ".vue") {
+			@Override
+			public IExtractor mkExtractor(ExtractorConfig config, ExtractorState state) {
+				return new HTMLExtractor(config);
+			}
+
+			@Override
+			public String toString() {
+				return "html";
+			}
+		},
+
+		JS(".js", ".jsx", ".mjs", ".es6", ".es") {
+			@Override
+			public IExtractor mkExtractor(ExtractorConfig config, ExtractorState state) {
+				return new ScriptExtractor(config);
+			}
+
+			@Override
+			protected boolean contains(File f, String lcExt, ExtractorConfig config) {
+				if (super.contains(f, lcExt, config))
+					return true;
+
+				// detect Node.js scripts that are meant to be run from
+				// the command line and do not have a `.js` extension
+				if (f.isFile() && lcExt.isEmpty()) {
+					try (BufferedReader br = new BufferedReader(new FileReader(f))) {
+						String firstLine = br.readLine();
+						// do a cheap check first
+						if (firstLine != null && firstLine.startsWith("#!")) {
+							// now do the slightly more expensive one
+							return NODE_INVOCATION.matcher(firstLine).find();
+						}
+					} catch (IOException e) {
+						Exceptions.ignore(e, "We simply skip this file.");
+					}
+				}
+
+				return false;
+			}
+
+			@Override
+			public String toString() {
+				return "javascript";
+			}
+		},
+
+		JSON(".json") {
+			@Override
+			public IExtractor mkExtractor(ExtractorConfig config, ExtractorState state) {
+				return new JSONExtractor(config);
+			}
+
+			@Override
+			protected boolean contains(File f, String lcExt, ExtractorConfig config) {
+				if (super.contains(f, lcExt, config))
+					return true;
+
+				// detect JSON-encoded configuration files whose name starts with `.` and ends with `rc`
+				// (e.g., `.eslintrc` or `.babelrc`)
+				if (f.isFile() && f.getName().matches("\\..*rc")) {
+					try (BufferedReader br = new BufferedReader(new FileReader(f))) {
+						// check whether the first two non-empty lines look like the start of a JSON object
+						// (two lines because the opening brace is usually on a line by itself)
+						StringBuilder firstTwoLines = new StringBuilder();
+						for (int i=0; i<2;) {
+							String nextLine = br.readLine();
+							if (nextLine == null)
+								break;
+							nextLine = nextLine.trim();
+							if (!nextLine.isEmpty()) {
+								firstTwoLines.append(nextLine);
+								++i;
+							}
+						}
+						return JSON_OBJECT_START.matcher(firstTwoLines).matches();
+					} catch (IOException e) {
+						Exceptions.ignore(e, "We simply skip this file.");
+					}
+				}
+
+				return false;
+			}
+
+			@Override
+			public String toString() {
+				return "json";
+			}
+		},
+
+		TYPESCRIPT(".ts", ".tsx") {
+			@Override
+			protected boolean contains(File f, String lcExt, ExtractorConfig config) {
+				if (config.getTypeScriptMode() == TypeScriptMode.NONE)
+					return false;
+
+				// Read the beginning of the file to guess the file type.
+				if (hasBadFileHeader(f, lcExt, config)) {
+					return false;
+				}
+
+				return super.contains(f, lcExt, config);
+			}
+
+			/**
+			 * Number of bytes to read from the beginning of a ".ts" file for sniffing its
+			 * file type.
+			 */
+			private static final int fileHeaderSize = 128;
+
+			private boolean hasBadFileHeader(File f, String lcExt, ExtractorConfig config) {
+				if (!".ts".equals(lcExt)) {
+					return false;
+				}
+				try (FileInputStream fis = new FileInputStream(f)) {
+					byte[] bytes = new byte[fileHeaderSize];
+					int length = fis.read(bytes);
+
+					// Avoid invalid or unprintable UTF-8 files.
+					if (config.getDefaultEncoding().equals("UTF-8") && hasUnprintableUtf8(bytes, length)) {
+						return true;
+					}
+
+					// Avoid trying to extract XML files.
+					if (isXml(bytes, length))
+						return true;
+
+					return false;
+				} catch (IOException e) {
+					Exceptions.ignore(e, "Let extractor handle this one.");
+				}
+				return false;
+			}
+
+			/** Returns the index after the initial BOM, if any, otherwise 0. */
+			private int skipBOM(byte[] bytes, int length) {
+				if (length >= 2 && (bytes[0] == (byte)0xfe && bytes[1] == (byte)0xff || bytes[0] == (byte)0xff && bytes[1] == (byte)0xfe)) {
+					return 2;
+				} else {
+					return 0;
+				}
+			}
+
+			private boolean isXml(byte[] bytes, int length) {
+				int startIndex = skipBOM(bytes, length);
+				// Check for `<` encoded in Ascii/UTF-8 or litte-endian UTF-16.
+				if (startIndex < length && bytes[startIndex] == '<') {
+					return true;
+				}
+				// Check for `<` encoded in big-endian UTF-16
+				if (startIndex + 1 < length && bytes[startIndex] == 0 && bytes[startIndex + 1] == '<') {
+					return true;
+				}
+				return false;
+			}
+
+			/**
+			 * Returns true if the byte sequence contains invalid UTF-8 or unprintable ASCII
+			 * characters.
+			 */
+			private boolean hasUnprintableUtf8(byte[] bytes, int length) {
+				// Constants for bytes with N high-order 1-bits.
+				// They are typed as `int` as the subsequent byte-to-int promotion would
+				// otherwise fill the high-order `int` bits with 1s.
+				final int high1 = 0b10000000;
+				final int high2 = 0b11000000;
+				final int high3 = 0b11100000;
+				final int high4 = 0b11110000;
+				final int high5 = 0b11111000;
+
+				int startIndex = skipBOM(bytes, length);
+				for (int i = startIndex; i < length; ++i) {
+					int b = bytes[i];
+					if ((b & high1) == 0) { // 0xxxxxxx is an ASCII character
+						// ASCII values 0-31 are unprintable, except 9-13 are whitespace.
+						// 127 is the unprintable DEL character.
+						if (b <= 8 || 14 <= b && b <= 31 || b == 127) {
+							return true;
+						}
+					} else {
+						// Check for malformed UTF-8 multibyte code point
+						int trailingBytes = 0;
+						if ((b & high3) == high2) {
+							trailingBytes = 1; // 110xxxxx 10xxxxxx
+						} else if ((b & high4) == high3) {
+							trailingBytes = 2; // 1110xxxx 10xxxxxx 10xxxxxx
+						} else if ((b & high5) == high4) {
+							trailingBytes = 3; // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
+						} else {
+							return true; // 10xxxxxx and 11111xxx are not valid here.
+						}
+						// Trailing bytes must be of form 10xxxxxx
+						while (trailingBytes > 0) {
+							++i;
+							--trailingBytes;
+							if (i >= length) {
+								return false;
+							}
+							if ((bytes[i] & high2) != high1) {
+								return true;
+							}
+						}
+					}
+				}
+				return false;
+			}
+
+			@Override
+			public IExtractor mkExtractor(ExtractorConfig config, ExtractorState state) {
+				return new TypeScriptExtractor(config, state.getTypeScriptParser());
+			}
+
+			@Override
+			public String toString() {
+				return "typescript";
+			}
+
+			@Override
+			public boolean isTrapCachingAllowed() {
+				return false; // Type information cannot be cached per-file.
+			}
+		},
+
+		YAML(".raml", ".yaml", ".yml") {
+			@Override
+			public IExtractor mkExtractor(ExtractorConfig config, ExtractorState state) {
+				return new YAMLExtractor(config);
+			}
+
+			@Override
+			public String toString() {
+				return "yaml";
+			}
+		};
+
+		/**
+		 * The file extensions (lower-case, including leading dot) corresponding to
+		 * this file type.
+		 */
+		private final Set<String> extensions = new LinkedHashSet<String>();
+
+		private FileType(String... extensions) {
+			for (String extension : extensions)
+				this.extensions.add(extension);
+		}
+
+		public Set<String> getExtensions() {
+			return extensions;
+		}
+
+		/**
+		 * Construct an extractor for this file type with the appropriate configuration settings.
+		 */
+		public abstract IExtractor mkExtractor(ExtractorConfig config, ExtractorState state);
+
+		/**
+		 * Determine the {@link FileType} for a given file.
+		 */
+		public static FileType forFile(File f, ExtractorConfig config) {
+			String lcExt = StringUtil.lc(FileUtil.extension(f));
+			for (FileType tp : values())
+				if (tp.contains(f, lcExt, config))
+					return tp;
+			return null;
+		}
+
+		/**
+		 * Determine the {@link FileType} for a given file based on its extension only.
+		 */
+		public static FileType forFileExtension(File f) {
+			String lcExt = StringUtil.lc(FileUtil.extension(f));
+			for (FileType tp : values())
+				if (tp.getExtensions().contains(lcExt)) {
+					return tp;
+				}
+			return null;
+		}
+
+		/**
+		 * Is the given file of this type?
+		 *
+		 * For convenience, the lower-case file extension is also passed as an argument.
+		 */
+		protected boolean contains(File f, String lcExt, ExtractorConfig config) {
+			return extensions.contains(lcExt);
+		}
+
+		/**
+		 * Can we cache the TRAP output of this file?
+		 *
+		 * Caching is disabled for TypeScript files as they depend on type information
+		 * from other files.
+		 */
+		public boolean isTrapCachingAllowed() {
+			return true;
+		}
+
+		/**
+		 * The names of all defined {@linkplain FileType}s.
+		 */
+		public static final Set<String> allNames = new LinkedHashSet<String>();
+		static {
+			for (FileType ft : FileType.values())
+				allNames.add(ft.name());
+		}
+	}
+
+	private final ExtractorConfig config;
+	private final ExtractorOutputConfig outputConfig;
+	private final ITrapCache trapCache;
+	private final ExtractorState state;
+
+	public FileExtractor(ExtractorConfig config, ExtractorOutputConfig outputConfig, ITrapCache trapCache, ExtractorState state) {
+		this.config = config;
+		this.outputConfig = outputConfig;
+		this.trapCache = trapCache;
+		this.state = state;
+	}
+
+	public ExtractorConfig getConfig() {
+		return config;
+	}
+
+	public boolean supports(File f) {
+		return config.hasFileType() || FileType.forFile(f, config) != null;
+	}
+
+	public void extract(File f) throws IOException {
+		// populate source archive
+		String source = new WholeIO(config.getDefaultEncoding()).strictread(f);
+		outputConfig.getSourceArchive().add(f, source);
+
+		// extract language-independent bits
+		TrapWriter trapwriter = outputConfig.getTrapWriterFactory().mkTrapWriter(f);
+		Label fileLabel = trapwriter.populateFile(f);
+		LocationManager locationManager = new LocationManager(f, trapwriter, fileLabel);
+		locationManager.emitFileLocation(fileLabel, 0, 0, 0, 0);
+
+		// now extract the contents
+		extractContents(f, fileLabel, source, locationManager);
+	}
+
+
+	/**
+	 * Extract the contents of a file, potentially making use of cached information.
+	 *
+	 * TRAP files can be logically split into two parts: a location-dependent
+	 * prelude containing all the `files`, `folders` and `containerparent` tuples, and
+	 * a content-dependent main part containing all the rest, which does not depend on
+	 * the source file location at all. Locations in the main part do, of course, refer
+	 * to the source file's ID, but they do so via its symbolic label, which is always
+	 * #10000.
+	 *
+	 * We only cache the content-dependent part, which makes up the bulk of the TRAP
+	 * file anyway. The location-dependent part is emitted from scratch every time
+	 * by the {@link #extract(File)} method above.
+	 *
+	 * In order to keep labels in the main part independent of the file's location,
+	 * we bump the TRAP label counter to a known value (currently 20000) after the
+	 * location-dependent part has been emitted. If the counter should already be larger
+	 * than that (which is theoretically possible with insanely deeply nested directories),
+	 * we have to skip caching.
+	 *
+	 * Also note that we support extraction with TRAP writer factories that are not file-backed;
+	 * obviously, no caching is done in that scenario.
+	 */
+	private void extractContents(File f, Label fileLabel, String source, LocationManager locationManager) throws IOException {
+		TrapWriter trapwriter = locationManager.getTrapWriter();
+		FileType fileType = config.hasFileType() ? FileType.valueOf(config.getFileType())
+				: FileType.forFile(f, config);
+
+		File cacheFile = null,   // the cache file for this extraction
+		     resultFile = null;  // the final result TRAP file for this extraction
+
+		// check whether we can perform caching
+		if (bumpIdCounter(trapwriter) && fileType.isTrapCachingAllowed()) {
+			resultFile = outputConfig.getTrapWriterFactory().getTrapFileFor(f);
+			if (resultFile != null)
+				cacheFile = trapCache.lookup(source, config, fileType);
+		}
+
+		if (cacheFile != null) {
+			FileUtil.close(trapwriter);
+
+			if (cacheFile.exists()) {
+				FileUtil.append(cacheFile, resultFile);
+				return;
+			}
+
+			// not in the cache yet, so use a caching TRAP writer to
+			// put the data into the cache and append it to the result file
+			trapwriter = new CachingTrapWriter(cacheFile, resultFile);
+			bumpIdCounter(trapwriter);
+			// re-initialise the location manager, since it keeps a reference to the TRAP writer
+			locationManager = new LocationManager(f, trapwriter, locationManager.getFileLabel());
+		}
+
+		// now do the extraction itself
+		boolean successful = false;
+		try {
+			IExtractor extractor = fileType.mkExtractor(config, state);
+			TextualExtractor textualExtractor = new TextualExtractor(trapwriter, locationManager,
+					source, config.getExtractLines());
+			LoCInfo loc = extractor.extract(textualExtractor);
+			int numLines = textualExtractor.getNumLines();
+			int linesOfCode = loc.getLinesOfCode(), linesOfComments = loc.getLinesOfComments();
+			trapwriter.addTuple("numlines", fileLabel, numLines, linesOfCode, linesOfComments);
+			trapwriter.addTuple("filetype", fileLabel, fileType.toString());
+			successful = true;
+		} finally {
+			if (!successful && trapwriter instanceof CachingTrapWriter)
+				((CachingTrapWriter) trapwriter).discard();
+
+			FileUtil.close(trapwriter);
+		}
+	}
+
+	/**
+	 * Bump trap ID counter to separate path-dependent and path-independent parts of the TRAP file.
+	 *
+	 * @return true if the counter was successfully bumped
+	 */
+	public boolean bumpIdCounter(TrapWriter trapwriter) {
+		return trapwriter.bumpIdCount(20000);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/HTMLExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/HTMLExtractor.java
new file mode 100644
index 00000000000..5d47fff222d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/HTMLExtractor.java
@@ -0,0 +1,317 @@
+package com.semmle.js.extractor;
+
+import java.util.regex.Pattern;
+
+import com.semmle.js.extractor.ExtractorConfig.Platform;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.parser.ParseError;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+import net.htmlparser.jericho.Attribute;
+import net.htmlparser.jericho.Attributes;
+import net.htmlparser.jericho.CharacterReference;
+import net.htmlparser.jericho.Element;
+import net.htmlparser.jericho.HTMLElementName;
+import net.htmlparser.jericho.RowColumnVector;
+import net.htmlparser.jericho.Segment;
+import net.htmlparser.jericho.Source;
+import net.htmlparser.jericho.StartTagType;
+
+/**
+ * Extractor for handling HTML and XHTML files.
+ */
+public class HTMLExtractor implements IExtractor {
+	/**
+	 * List of HTML attributes whose value is interpreted as JavaScript.
+	 */
+	private final static Pattern JS_ATTRIBUTE = Pattern.compile("^on(abort|blur|change|(dbl)?click|error|focus|key(down|press|up)|load|mouse(down|move|out|over|up)|re(set|size)|select|submit|unload)$", Pattern.CASE_INSENSITIVE);
+
+	private final ExtractorConfig config;
+
+	public HTMLExtractor(ExtractorConfig config) {
+		this.config = config.withPlatform(Platform.WEB);
+	}
+
+	@Override
+	public LoCInfo extract(TextualExtractor textualExtractor) {
+		LoCInfo result = new LoCInfo(0, 0);
+
+		Source src = new Source(textualExtractor.getSource());
+		src.setLogger(null);
+		ScopeManager scopeManager = new ScopeManager(textualExtractor.getTrapwriter(), config.getEcmaVersion());
+
+		LocationManager locationManager = textualExtractor.getLocationManager();
+
+		/*
+		 * Extract all JavaScript snippets appearing in (in-line) script elements and
+		 * as attribute values.
+		 */
+		for (Element elt : src.getAllElements()) {
+			LoCInfo snippetLoC = null;
+			if (elt.getName().equals(HTMLElementName.SCRIPT)) {
+				SourceType sourceType = getScriptSourceType(elt);
+				if (sourceType != null) {
+					// Jericho sometimes misparses empty elements, which will show up as start tags
+					// ending in "/"; we manually exclude these cases to avoid spurious syntax errors
+					if (elt.getStartTag().getTagContent().toString().trim().endsWith("/"))
+						continue;
+
+					Segment content = elt.getContent();
+					String source = content.toString();
+
+					/*
+					 * Script blocks in XHTML files may wrap (parts of) their code inside CDATA sections.
+					 * We need to unwrap them in order not to confuse the JavaScript parser.
+					 *
+					 * Note that CDATA sections do not nest, so they can be detected by a regular expression.
+					 *
+					 * In order to preserve position information, we replace the CDATA section markers with
+					 * an equivalent number of whitespace characters. This will yield surprising results
+					 * for CDATA sections inside string literals, but those are likely to be rare.
+					 */
+					source = source.replace("<![CDATA[", "         ").replace("]]>", "   ");
+					if (!source.trim().isEmpty()) {
+						RowColumnVector contentStart = content.getRowColumnVector();
+						snippetLoC = extractSnippet(1, config.withSourceType(sourceType), scopeManager, textualExtractor, source,
+								contentStart.getRow(), contentStart.getColumn());
+					}
+				}
+			} else {
+				Attributes attributes = elt.getAttributes();
+				// attributes can be null for directives
+				if (attributes != null)
+					for (Attribute attr : attributes) {
+						// ignore empty attributes
+						if (attr.getValue() == null || attr.getValue().isEmpty())
+							continue;
+
+						String source = attr.getValue();
+						RowColumnVector valueStart = attr.getValueSegment().getRowColumnVector();
+						if (JS_ATTRIBUTE.matcher(attr.getName()).matches()) {
+							snippetLoC = extractSnippet(2, config, scopeManager, textualExtractor, source,
+									valueStart.getRow(), valueStart.getColumn());
+						} else if (source.startsWith("javascript:")) {
+							source = source.substring(11);
+							snippetLoC = extractSnippet(3, config, scopeManager, textualExtractor, source,
+									valueStart.getRow(), valueStart.getColumn()+11);
+						}
+					}
+			}
+
+			if (snippetLoC != null)
+				result.add(snippetLoC);
+		}
+
+		// extract HTML elements if necessary.
+		if (config.getHtmlHandling().extractElements()) {
+			extractChildElements(src, locationManager);
+
+			for (Element elt : src.getAllElements()) {
+				if (isPlainElement(elt)) {
+					extractChildElements(elt, locationManager);
+					extractAttributes(elt, locationManager);
+				}
+			}
+		}
+
+		return result;
+	}
+
+	/**
+	 * Deduce the {@link SourceType} with which the given <code>script</code>
+	 * element should be extracted, returning <code>null</code> if it cannot
+	 * be determined.
+	 */
+	private SourceType getScriptSourceType(Element script) {
+		String scriptType = getAttributeValueLC(script, "type");
+		String scriptLanguage = getAttributeValueLC(script, "language");
+
+		// if `type` and `language` are both either missing, contain the
+		// string "javascript", or if `type` is the string "text/jsx", this is a plain script
+		if ((scriptType == null || scriptType.contains("javascript") || "text/jsx".equals(scriptType)) &&
+			(scriptLanguage == null || scriptLanguage.contains("javascript")))
+			// use default source type
+			return config.getSourceType();
+
+
+		// if `type` is "text/babel", the source type depends on the `data-plugins` attribute
+		if ("text/babel".equals(scriptType)) {
+			String plugins = getAttributeValueLC(script, "data-plugins");
+			if (plugins != null && plugins.contains("transform-es2015-modules-umd")) {
+				return SourceType.MODULE;
+			}
+			return config.getSourceType();
+		}
+
+		// if `type` is "module", extract as module
+		if ("module".equals(scriptType))
+			return SourceType.MODULE;
+
+		return null;
+	}
+
+	/**
+	 * Get the value of attribute <code>attr</code> of element <code>elt</code>
+	 * in lower case; if the attribute has no value, <code>null</code> is returned.
+	 */
+	private String getAttributeValueLC(Element elt, String attr) {
+		String val = elt.getAttributeValue(attr);
+		return val == null ? val : StringUtil.lc(val);
+	}
+
+	private LoCInfo extractSnippet(int toplevelKind, ExtractorConfig config,
+			ScopeManager scopeManager, TextualExtractor textualExtractor,
+			String source, int line, int column) {
+		TrapWriter trapwriter = textualExtractor.getTrapwriter();
+		LocationManager locationManager = textualExtractor.getLocationManager();
+		LocationManager scriptLocationManager = new LocationManager(locationManager.getSourceFile(), trapwriter, locationManager.getFileLabel());
+		scriptLocationManager.setStart(line, column);
+		JSExtractor extractor = new JSExtractor(config);
+		try {
+			TextualExtractor tx = new TextualExtractor(trapwriter, scriptLocationManager, source, config.getExtractLines());
+			return extractor.extract(tx, source, toplevelKind, scopeManager).snd();
+		} catch (ParseError e) {
+			e.setPosition(scriptLocationManager.translatePosition(e.getPosition()));
+			throw e.asUserError();
+		}
+	}
+
+	/**
+	 * Is {@code elt} a plain HTML element (as opposed to a doctype declaration, comment,
+	 * processing instruction, etc.)?
+	 */
+	private boolean isPlainElement(Element elt) {
+		return elt.getStartTag().getTagType() == StartTagType.NORMAL;
+	}
+
+	/**
+	 * Is {@code elt} a CDATA element ?
+	 */
+	private boolean isCDataElement(Element elt) {
+		return elt.getStartTag().getTagType() == StartTagType.CDATA_SECTION;
+	}
+
+	/**
+	 * Is {@code elt} an HTML comment?
+	 */
+	private boolean isComment(Element elt) {
+		return elt.getStartTag().getTagType() == StartTagType.COMMENT;
+	}
+
+	/**
+	 * Populate the {@code xmlElements} relation recording information about all child
+	 * elements of {@code parent}, which is either an {@link Element} or a {@link Source}
+	 * (representing the HTML file itself).
+	 */
+	private void extractChildElements(Segment parent, LocationManager locationManager) {
+		TrapWriter trapWriter = locationManager.getTrapWriter();
+		Label fileLabel = locationManager.getFileLabel();
+		Label parentLabel = parent instanceof Source ? fileLabel : trapWriter.localID(parent);
+		int childIndex = 0;
+		Source source = parent.getSource();
+		int contentStart = parent instanceof Element ? ((Element) parent).getStartTag().getEnd() : parent.getBegin();
+		int contentEnd;
+		if (parent instanceof Element && ((Element) parent).getEndTag() != null)
+			contentEnd = ((Element) parent).getEndTag().getBegin();
+		else
+			contentEnd = parent.getEnd();
+		int prevChildEnd = contentStart;
+		for (Element child : parent.getChildElements()) {
+			childIndex += emitXmlChars(source, prevChildEnd, child.getBegin(), parentLabel, childIndex, false, fileLabel, locationManager);
+
+			if (isCDataElement(child)) {
+				// treat CDATA sections as text
+				childIndex += emitXmlChars(source, child.getBegin() + "<![CDATA[".length(), child.getEnd() - "]]>".length(), parentLabel, childIndex, true, fileLabel, locationManager);
+			}
+
+			if (isPlainElement(child)) {
+				String childName = child.getName();
+				Label childLabel = trapWriter.localID(child);
+				trapWriter.addTuple("xmlElements", childLabel, childName, parentLabel, childIndex++, fileLabel);
+				emitLocation(child, childLabel, locationManager);
+			}
+
+			if (config.getHtmlHandling().extractComments() && isComment(child)) {
+				Label childLabel = trapWriter.localID(child);
+				trapWriter.addTuple("xmlComments", childLabel, child.toString(), parentLabel, fileLabel);
+				emitLocation(child, childLabel, locationManager);
+			}
+
+			prevChildEnd = child.getEnd();
+		}
+		emitXmlChars(source, prevChildEnd, contentEnd, parentLabel, childIndex, false, fileLabel, locationManager);
+	}
+
+	/**
+	 * Populate the {@code xmlAttrs} relation recording information about all attributes
+	 * of {@code elt}.
+	 */
+	private void extractAttributes(Element elt, LocationManager locationManager) {
+		TrapWriter trapWriter = locationManager.getTrapWriter();
+		Label fileLabel = locationManager.getFileLabel();
+		Label eltLabel = trapWriter.localID(elt);
+		Attributes attributes = elt.getAttributes();
+		// attributes can be null for directives
+		if (attributes == null)
+			return;
+		int i = 0;
+		for (Attribute attr : attributes) {
+			String attrName = attr.getName();
+			String attrValue = attr.getValue() == null ? "" : attr.getValue();
+			Label attrLabel = trapWriter.localID(attr);
+			trapWriter.addTuple("xmlAttrs", attrLabel, eltLabel, attrName, attrValue, i++, fileLabel);
+			emitLocation(attr, attrLabel, locationManager);
+		}
+	}
+
+	/**
+	 * Record the location of {@code s}, which is either an {@link Element} or
+	 * an {@code Attribute}.
+	 */
+	private void emitLocation(Segment s, Label label, LocationManager locationManager) {
+		TrapWriter trapWriter = locationManager.getTrapWriter();
+		Source src = s.getSource();
+		int so = s.getBegin(), eo = s.getEnd()-1;
+		int sl = src.getRow(so), sc = src.getColumn(so);
+		int el = src.getRow(eo), ec = src.getColumn(eo);
+		Label loc = locationManager.emitLocationsDefault(sl, sc, el, ec);
+		trapWriter.addTuple("xmllocations", label, loc);
+	}
+
+	/**
+	 * If {@code textEnd} is greater than {@code textBegin}, extract all characters
+	 * in that range as HTML text, populating {@code xmlChars} and make it the 
+	 * {@code i}th child of {@code parentLabel}.
+	 *
+	 * @return 1 if text was extractod, 0 otherwise
+	 */
+	private int emitXmlChars(Source src, int textBegin, int textEnd, Label parentLabel, int id, boolean isCData, Label fileLabel,
+			LocationManager locationManager) {
+		if (!config.getHtmlHandling().extractText()) {
+			return 0;
+		}
+		if (textBegin >= textEnd) {
+			return 0;
+		}
+		TrapWriter trapWriter = locationManager.getTrapWriter();
+		Segment s = new Segment(src, textBegin, textEnd);
+
+		int so = s.getBegin(), eo = s.getEnd() - 1;
+		String rawText = s.toString();
+		if (!isCData) {
+			 // expand entities. Note that `rawText` no longer spans the start/end region. 
+			rawText = CharacterReference.decode(rawText, false);
+		}
+		Label label = trapWriter.freshLabel();
+		trapWriter.addTuple("xmlChars", label, rawText, parentLabel, id, isCData? 1: 0, fileLabel);
+		int sl = src.getRow(so), sc = src.getColumn(so);
+		int el = src.getRow(eo), ec = src.getColumn(eo);
+		Label loc = locationManager.emitLocationsDefault(sl, sc, el, ec);
+		trapWriter.addTuple("xmllocations", label, loc);
+
+		return 1;
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/IExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/IExtractor.java
new file mode 100644
index 00000000000..fa89828dde7
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/IExtractor.java
@@ -0,0 +1,15 @@
+package com.semmle.js.extractor;
+
+import java.io.IOException;
+
+/**
+ * Generic extractor interface.
+ */
+public interface IExtractor {
+	/**
+	 * Extract a snippet of code whose textual information is provided by the
+	 * given {@link TextualExtractor}, and return information about the
+	 * number of lines of code and the number of lines of comments extracted.
+	 */
+	public LoCInfo extract(TextualExtractor textualExtractor) throws IOException;
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/JSDocExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/JSDocExtractor.java
new file mode 100644
index 00000000000..70c3592e7a1
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/JSDocExtractor.java
@@ -0,0 +1,251 @@
+package com.semmle.js.extractor;
+
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.jsdoc.AllLiteral;
+import com.semmle.js.ast.jsdoc.ArrayType;
+import com.semmle.js.ast.jsdoc.FieldType;
+import com.semmle.js.ast.jsdoc.FunctionType;
+import com.semmle.js.ast.jsdoc.JSDocComment;
+import com.semmle.js.ast.jsdoc.JSDocElement;
+import com.semmle.js.ast.jsdoc.JSDocTag;
+import com.semmle.js.ast.jsdoc.JSDocTypeExpression;
+import com.semmle.js.ast.jsdoc.NameExpression;
+import com.semmle.js.ast.jsdoc.NonNullableType;
+import com.semmle.js.ast.jsdoc.NullLiteral;
+import com.semmle.js.ast.jsdoc.NullableLiteral;
+import com.semmle.js.ast.jsdoc.NullableType;
+import com.semmle.js.ast.jsdoc.OptionalType;
+import com.semmle.js.ast.jsdoc.ParameterType;
+import com.semmle.js.ast.jsdoc.RecordType;
+import com.semmle.js.ast.jsdoc.RestType;
+import com.semmle.js.ast.jsdoc.TypeApplication;
+import com.semmle.js.ast.jsdoc.UnaryTypeConstructor;
+import com.semmle.js.ast.jsdoc.UndefinedLiteral;
+import com.semmle.js.ast.jsdoc.UnionType;
+import com.semmle.js.ast.jsdoc.Visitor;
+import com.semmle.js.ast.jsdoc.VoidLiteral;
+import com.semmle.js.parser.JSDocParser;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating JSDoc comments.
+ */
+public class JSDocExtractor {
+	private static final Map<String, Integer> jsdocTypeExprKinds = new LinkedHashMap<String, Integer>();
+	static {
+		jsdocTypeExprKinds.put("AllLiteral", 0);
+		jsdocTypeExprKinds.put("NullLiteral", 1);
+		jsdocTypeExprKinds.put("UndefinedLiteral", 2);
+		jsdocTypeExprKinds.put("NullableLiteral", 3);
+		jsdocTypeExprKinds.put("VoidLiteral", 4);
+		jsdocTypeExprKinds.put("NameExpression", 5);
+		jsdocTypeExprKinds.put("TypeApplication", 6);
+		jsdocTypeExprKinds.put("NullableType", 7);
+		jsdocTypeExprKinds.put("NonNullableType", 8);
+		jsdocTypeExprKinds.put("RecordType", 9);
+		jsdocTypeExprKinds.put("ArrayType", 10);
+		jsdocTypeExprKinds.put("UnionType", 11);
+		jsdocTypeExprKinds.put("FunctionType", 12);
+		jsdocTypeExprKinds.put("OptionalType", 13);
+		jsdocTypeExprKinds.put("RestType", 14);
+	}
+
+	private final TrapWriter trapwriter;
+	private final LocationManager locationManager;
+
+	public JSDocExtractor(TextualExtractor textualExtractor) {
+		this.trapwriter = textualExtractor.getTrapwriter();
+		this.locationManager = textualExtractor.getLocationManager();
+	}
+
+	private class V implements Visitor {
+		private Label parent;
+		private int idx;
+
+		private Label visit(JSDocTypeExpression nd) {
+			Label key = trapwriter.localID(nd);
+			int kind = jsdocTypeExprKinds.get(nd.getType());
+			trapwriter.addTuple("jsdoc_type_exprs", key, kind, parent, idx, nd.pp());
+			return key;
+		}
+
+		public void visit(Label parent, List<? extends JSDocElement> nds) {
+			Label oldParent = this.parent;
+			int oldIdx = this.idx;
+
+			this.parent = parent;
+			this.idx = 0;
+
+			for (JSDocElement element : nds) {
+				element.accept(this);
+				++this.idx;
+			}
+
+			this.parent = oldParent;
+			this.idx = oldIdx;
+		}
+
+		public void visit(JSDocElement child, Label parent, int idx) {
+			if (child == null)
+				return;
+
+			Label oldParent = this.parent;
+			int oldIdx = this.idx;
+
+			this.parent = parent;
+			this.idx = idx;
+			child.accept(this);
+
+			this.parent = oldParent;
+			this.idx = oldIdx;
+		}
+
+		@Override
+		public void visit(AllLiteral nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(FieldType nd) {
+			trapwriter.addTuple("jsdoc_record_field_name", parent, idx, nd.getKey());
+			if (nd.hasValue())
+				visit(nd.getValue(), parent, idx);
+		}
+
+		@Override
+		public void visit(RecordType nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			visit(label, nd.getFields());
+		}
+
+		@Override
+		public void visit(NameExpression nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(NullableLiteral nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(NullLiteral nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(UndefinedLiteral nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(VoidLiteral nd) {
+			visit((JSDocTypeExpression)nd);
+		}
+
+		@Override
+		public void visit(JSDocComment nd) {
+			Label commentLabel = trapwriter.localID(nd.getComment());
+			Label jsdocLabel = trapwriter.freshLabel();
+			trapwriter.addTuple("jsdoc", jsdocLabel, nd.getDescription(), commentLabel);
+			locationManager.emitNodeLocation(nd, jsdocLabel);
+			visit(jsdocLabel, nd.getTags());
+		}
+
+		@Override
+		public void visit(JSDocTag nd) {
+			Label label = trapwriter.localID(nd);
+			trapwriter.addTuple("jsdoc_tags", label, nd.getTitle(), parent, idx, "@" + nd.getTitle());
+			locationManager.emitNodeLocation(nd, label);
+
+			if (nd.hasDescription() && !nd.getDescription().isEmpty())
+				trapwriter.addTuple("jsdoc_tag_descriptions", label, nd.getDescription());
+			if (nd.hasName())
+				trapwriter.addTuple("jsdoc_tag_names", label, nd.getName());
+			visit(nd.getType(), label, 0);
+
+			for (String msg : nd.getErrors())
+				trapwriter.addTuple("jsdoc_errors", trapwriter.freshLabel(), label, msg,
+						TextualExtractor.sanitiseToString(msg));
+		}
+
+		@Override
+		public void visit(UnionType nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			List<JSDocTypeExpression> elements = nd.getElements();
+			visit(label, elements);
+		}
+
+		@Override
+		public void visit(ArrayType nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			List<JSDocTypeExpression> elements = nd.getElements();
+			visit(label, elements);
+		}
+
+		@Override
+		public void visit(TypeApplication nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			visit(nd.getExpression(), label, -1);
+			visit(label, nd.getApplications());
+		}
+
+		@Override
+		public void visit(FunctionType nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			visit(label, nd.getParams());
+			visit(nd.getResult(), label, -1);
+			visit(nd.getThis(), label, -2);
+			if (nd.isNew())
+				trapwriter.addTuple("jsdoc_has_new_parameter", label);
+		}
+
+		@Override
+		public void visit(ParameterType nd) {
+			visit(nd.getExpression(), parent, idx);
+		}
+
+		private void visit(UnaryTypeConstructor nd) {
+			Label label = visit((JSDocTypeExpression)nd);
+			visit(nd.getExpression(), label, 0);
+			if (!(nd instanceof RestType) && nd.isPrefix())
+				trapwriter.addTuple("jsdoc_prefix_qualifier", label);
+		}
+
+		@Override
+		public void visit(NonNullableType nd) {
+			visit((UnaryTypeConstructor)nd);
+		}
+
+		@Override
+		public void visit(NullableType nd) {
+			visit((UnaryTypeConstructor)nd);
+		}
+
+		@Override
+		public void visit(OptionalType nd) {
+			visit((UnaryTypeConstructor)nd);
+		}
+
+		@Override
+		public void visit(RestType nd) {
+			visit((UnaryTypeConstructor)nd);
+		}
+	}
+
+	public void extract(List<Comment> comments) {
+		JSDocParser jsdocParser = new JSDocParser();
+
+		for (Comment comment : comments) {
+			if (comment.isDocComment()) {
+				JSDocComment docComment = jsdocParser.parse(comment);
+				docComment.accept(new V());
+			}
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/JSExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/JSExtractor.java
new file mode 100644
index 00000000000..1d5a14183cd
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/JSExtractor.java
@@ -0,0 +1,139 @@
+package com.semmle.js.extractor;
+
+import java.util.ArrayList;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Token;
+import com.semmle.js.extractor.ExtractorConfig.ECMAVersion;
+import com.semmle.js.extractor.ExtractorConfig.Platform;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.parser.JSParser;
+import com.semmle.js.parser.ParseError;
+import com.semmle.util.data.Pair;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating JavaScript source code, including AST information, lexical information about
+ * comments and tokens, textual information about lines, control flow graphs, and JSDoc comments.
+ */
+public class JSExtractor {
+	private final ExtractorConfig config;
+
+	public JSExtractor(ExtractorConfig config) {
+		this.config = config;
+	}
+
+	// heuristic: if `import` or `export` appears at the beginning of a line, it's probably a module
+	private static final Pattern containsImportOrExport = Pattern.compile("(?m)^([ \t]*)(import|export)\\b");
+
+	public Pair<Label, LoCInfo> extract(TextualExtractor textualExtractor, String source, int toplevelKind, ScopeManager scopeManager) throws ParseError {
+		// if the file starts with `{ "<string>":` it won't parse as JavaScript; try parsing as JSON instead
+		if (FileExtractor.JSON_OBJECT_START.matcher(textualExtractor.getSource()).matches()) {
+			try {
+				LoCInfo loc = new JSONExtractor(config.withTolerateParseErrors(false)).extract(textualExtractor);
+				return Pair.make(null, loc);
+			} catch (UserError ue) {
+				// didn't work, so parse as JavaScript (and fail)
+				Exceptions.ignore(ue, "Try parsing as JavaScript instead.");
+			}
+		}
+
+
+		SourceType sourceType = establishSourceType(source, true);
+
+		JSParser.Result parserRes = JSParser.parse(config, sourceType, source);
+		return extract(textualExtractor, source, toplevelKind, scopeManager,
+				sourceType, parserRes);
+	}
+
+	/**
+	 * Determine the {@link SourceType} of {@code source}.
+	 *
+	 * If the configuration specifies as explicit source type, we use that.
+	 * Otherwise, for ECMAScript 2015 and greater we check for lines starting with
+	 * {@code import} or {@code export}, and if we find any we assume it's a module.
+	 * For plain JavaScript, we allow leading whitespace before the {@code import}/
+	 * {@code export}, but not for TypeScript, to avoid getting confused by namespace
+	 * exports.
+	 *
+	 * If all else fails, we go with {@link SourceType#SCRIPT}.
+	 */
+	public SourceType establishSourceType(String source, boolean allowLeadingWS) {
+		SourceType sourceType = config.getSourceType();
+		if (sourceType != SourceType.AUTO)
+			return sourceType;
+		if (config.getEcmaVersion().compareTo(ECMAVersion.ECMA2015) >= 0) {
+			Matcher m = containsImportOrExport.matcher(source);
+			if (m.find() && (allowLeadingWS || m.group(1).isEmpty()))
+				return SourceType.MODULE;
+		}
+		return SourceType.SCRIPT;
+	}
+
+	public Pair<Label, LoCInfo> extract(TextualExtractor textualExtractor,
+			String source, int toplevelKind, ScopeManager scopeManager,
+			SourceType sourceType, JSParser.Result parserRes)
+			throws ParseError {
+		Label toplevelLabel;
+		TrapWriter trapwriter = textualExtractor.getTrapwriter();
+		LocationManager locationManager = textualExtractor.getLocationManager();
+		Platform platform = config.getPlatform();
+		Node ast = parserRes.getAST();
+		LexicalExtractor lexicalExtractor;
+		LoCInfo loc;
+		if (ast != null) {
+			platform = getPlatform(platform, ast);
+
+			lexicalExtractor = new LexicalExtractor(textualExtractor, parserRes.getTokens(), parserRes.getComments());
+			ASTExtractor scriptExtractor = new ASTExtractor(lexicalExtractor, scopeManager);
+			toplevelLabel = scriptExtractor.getToplevelLabel();
+
+			scriptExtractor.extract(ast, platform, sourceType, toplevelKind);
+			lexicalExtractor.extractComments(toplevelLabel);
+			loc = lexicalExtractor.extractLines(parserRes.getSource(), toplevelLabel);
+			lexicalExtractor.extractTokens(toplevelLabel);
+			new CFGExtractor(scriptExtractor).extract(ast);
+			new JSDocExtractor(textualExtractor).extract(lexicalExtractor.getComments());
+		} else {
+			lexicalExtractor = new LexicalExtractor(textualExtractor, new ArrayList<Token>(), new ArrayList<Comment>());
+			ASTExtractor scriptExtractor = new ASTExtractor(lexicalExtractor, null);
+			toplevelLabel = scriptExtractor.getToplevelLabel();
+
+			trapwriter.addTuple("toplevels", toplevelLabel, toplevelKind);
+			locationManager.emitSnippetLocation(toplevelLabel, 1, 1, 1, 1);
+			loc = new LoCInfo(0, 0);
+		}
+
+		for (ParseError parseError : parserRes.getErrors()) {
+			if (!config.isTolerateParseErrors())
+				throw parseError;
+
+			Label key = trapwriter.freshLabel();
+			String errorLine = textualExtractor.getLine(parseError.getPosition().getLine());
+			trapwriter.addTuple("jsParseErrors", key, toplevelLabel, "Error: " + parseError, errorLine);
+			locationManager.emitErrorLocation(key, parseError.getPosition(), textualExtractor.getNumLines());
+			lexicalExtractor.extractLines(source, toplevelLabel);
+		}
+
+		if (config.isExterns())
+			textualExtractor.getTrapwriter().addTuple("isExterns", toplevelLabel);
+		if (platform == Platform.NODE && sourceType != SourceType.MODULE)
+			textualExtractor.getTrapwriter().addTuple("isNodejs", toplevelLabel);
+
+		return Pair.make(toplevelLabel, loc);
+	}
+
+	private Platform getPlatform(Platform platform, Node ast) {
+		if (platform == Platform.AUTO)
+			return NodeJSDetector.looksLikeNodeJS(ast) ? Platform.NODE : Platform.WEB;
+
+		return platform;
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/JSONExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/JSONExtractor.java
new file mode 100644
index 00000000000..c9804ed6caf
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/JSONExtractor.java
@@ -0,0 +1,112 @@
+package com.semmle.js.extractor;
+
+import java.util.List;
+
+import com.semmle.js.ast.json.JSONArray;
+import com.semmle.js.ast.json.JSONLiteral;
+import com.semmle.js.ast.json.JSONObject;
+import com.semmle.js.ast.json.JSONValue;
+import com.semmle.js.ast.json.Visitor;
+import com.semmle.js.parser.JSONParser;
+import com.semmle.js.parser.ParseError;
+import com.semmle.util.data.Pair;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating JSON files.
+ */
+public class JSONExtractor implements IExtractor {
+	private static class Context {
+		private final Label parent;
+		private final int childIndex;
+
+		public Context(Label parent, int childIndex) {
+			this.parent = parent;
+			this.childIndex = childIndex;
+		}
+	}
+
+	private final boolean tolerateParseErrors;
+
+	public JSONExtractor(ExtractorConfig config) {
+		this.tolerateParseErrors = config.isTolerateParseErrors();
+	}
+
+	@Override
+	public LoCInfo extract(final TextualExtractor textualExtractor) {
+		final TrapWriter trapwriter = textualExtractor.getTrapwriter();
+		final LocationManager locationManager = textualExtractor.getLocationManager();
+		try {
+			String source = textualExtractor.getSource();
+			Pair<JSONValue, List<ParseError>> res = new JSONParser().parseValue(source);
+			JSONValue v = res.fst();
+			List<ParseError> recoverableErrors = res.snd();
+			if (!recoverableErrors.isEmpty() && !tolerateParseErrors)
+				throw recoverableErrors.get(0).asUserError();
+
+			Label fileLabel = locationManager.getFileLabel();
+			v.accept(new Visitor<Context, Label>() {
+				private Label emit(JSONValue nd, int kind, Context c) {
+					Label label = trapwriter.localID(nd);
+					trapwriter.addTuple("json", label, kind, c.parent, c.childIndex, textualExtractor.mkToString(nd));
+					locationManager.emitNodeLocation(nd, label);
+					return label;
+				}
+
+				@Override
+				public Label visit(JSONLiteral nd, Context c) {
+					int kind = 0;
+					if (nd.getValue() instanceof Boolean)
+						kind = 1;
+					else if (nd.getValue() instanceof Number)
+						kind = 2;
+					else if (nd.getValue() instanceof String)
+						kind = 3;
+					Label label = emit(nd, kind, c);
+					trapwriter.addTuple("json_literals", nd.getStringValue(), nd.getRaw(), label);
+					return label;
+				}
+
+				@Override
+				public Label visit(JSONArray nd, Context c) {
+					Label label = emit(nd, 4, c);
+					int i = 0;
+					for (JSONValue element : nd.getElements())
+						element.accept(this, new Context(label, i++));
+					return label;
+				}
+
+				@Override
+				public Label visit(JSONObject nd, Context c) {
+					Label label = emit(nd, 5, c);
+					int i = 0;
+					for (Pair<String, JSONValue> prop : nd.getProperties()) {
+						String name = prop.fst();
+						Label vallabel = prop.snd().accept(this, new Context(label, i++));
+						trapwriter.addTuple("json_properties", label, name, vallabel);
+					}
+					return label;
+				}
+			}, new Context(fileLabel, 0));
+
+			for (ParseError e : recoverableErrors)
+				populateError(textualExtractor, trapwriter, locationManager, e);
+		} catch (ParseError e) {
+			if (!this.tolerateParseErrors)
+				throw e.asUserError();
+
+			populateError(textualExtractor, trapwriter, locationManager, e);
+		}
+
+		return new LoCInfo(0, 0);
+	}
+
+	private void populateError(final TextualExtractor textualExtractor,
+			final TrapWriter trapwriter, final LocationManager locationManager,
+			ParseError e) {
+		Label label = trapwriter.freshLabel();
+		trapwriter.addTuple("json_errors", label, "Error: " + e);
+		locationManager.emitErrorLocation(label, e.getPosition(), textualExtractor.getNumLines());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/JumpType.java b/javascript/extractor/src/com/semmle/js/extractor/JumpType.java
new file mode 100644
index 00000000000..2fd444f67e2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/JumpType.java
@@ -0,0 +1,8 @@
+package com.semmle.js.extractor;
+
+/**
+ * Simple enum for representing the four kinds of unstructured control flow in JavaScript.
+ */
+public enum JumpType {
+	BREAK, CONTINUE, THROW, RETURN;
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/extractor/LexicalExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/LexicalExtractor.java
new file mode 100644
index 00000000000..242ce0d2a13
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/LexicalExtractor.java
@@ -0,0 +1,176 @@
+package com.semmle.js.extractor;
+
+import java.util.List;
+
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.Token;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating lexical information about a JavaScript file, including comments and tokens.
+ */
+public class LexicalExtractor {
+	private final TextualExtractor textualExtractor;
+	private final TrapWriter trapwriter;
+	private final LocationManager locationManager;
+	private final List<Token> tokens;
+	private final List<Comment> comments;
+
+	public LexicalExtractor(TextualExtractor textualExtractor, List<Token> tokens, List<Comment> comments) {
+		this.textualExtractor = textualExtractor;
+		this.trapwriter = textualExtractor.getTrapwriter();
+		this.locationManager = textualExtractor.getLocationManager();
+		this.tokens = tokens;
+		this.comments = comments;
+	}
+
+	public TrapWriter getTrapwriter() {
+		return trapwriter;
+	}
+
+	public LocationManager getLocationManager() {
+		return locationManager;
+	}
+
+	public List<Comment> getComments() {
+		return comments;
+	}
+
+	public LoCInfo extractLines(String src, Label toplevelKey) {
+		Position end = textualExtractor.extractLines(src, toplevelKey);
+		return emitNumlines(toplevelKey, new Position(1, 0, 0), end);
+	}
+
+	/**
+	 * Emit line number information for an entity.
+	 *
+	 * @param key the entity key
+	 * @param start the start position of the node
+	 * @param end the end position of the node
+	 */
+	public LoCInfo emitNumlines(Label key, Position start, Position end) {
+		int num_code = 0, num_comment = 0, num_lines = end.getLine() - start.getLine() + 1;
+
+		if (tokens != null && comments != null) {
+			// every line on which there is a (non-EOF) token counts as a line of code
+			int maxline = 0; // maximum line number on which we've seen a token so far
+			for (int i = findNode(tokens, start), m = tokens.size(); i<m; ++i) {
+				Token token = tokens.get(i);
+				if (token.getLoc().getStart().compareTo(end) >= 0 || token.getType() == Token.Type.EOF)
+					break;
+				for (int j = token.getLoc().getStart().getLine(), n = token.getLoc().getEnd().getLine(); j <= n; ++j) {
+					if (j > maxline) {
+						// token covers a new line, so increment count and update maxline
+						maxline = j;
+						++num_code;
+					}
+				}
+			}
+
+			// every line on which there is a comment counts as a line of comment
+			maxline = 0; // maximum line number on which we've seen a comment so far
+			for (int i = findNode(comments, start), m = comments.size(); i<m; ++i) {
+				Comment comment = comments.get(i);
+				if (comment.getLoc().getStart().compareTo(end) >= 0)
+					break;
+				for (int j = comment.getLoc().getStart().getLine(), n = comment.getLoc().getEnd().getLine(); j <= n; ++j) {
+					if (j > maxline) {
+						// comment covers a new line, so increment count and update maxline
+						maxline = j;
+						++num_comment;
+					}
+				}
+			}
+		}
+
+		trapwriter.addTuple("numlines", key, num_lines, num_code, num_comment);
+		return new LoCInfo(num_code, num_comment);
+	}
+
+	private <T extends SourceElement> int findNode(List<T> ts, Position start) {
+		int lo = 0, hi = ts.size(), mid;
+
+		/**
+		 * Invariant: forall i in [0..lo), ts[i] starts before `start`
+		 *        and forall i in [hi..ts.size()), ts[i] starts at or after `start`
+		 */
+		while (lo < hi) {
+			// other parts of the extractor will break long before this could overflow
+			mid = (lo + hi) >>> 1;
+			if (ts.get(mid).getLoc().getStart().compareTo(start) >= 0)
+				hi = mid;
+			else
+				lo = mid+1;
+		}
+
+		return hi;
+	}
+
+	public void extractTokens(Label toplevelKey) {
+		int j = 0;
+		for (int i=0, n=tokens.size(), idx=0; i<n; ++i) {
+			Token token = tokens.get(i);
+			if (token == null)
+				continue;
+
+			Label key = trapwriter.freshLabel();
+			int kind = -1;
+			switch (token.getType()) {
+			case EOF: kind = 0; break;
+			case NULL: kind = 1; break;
+			case FALSE: case TRUE: kind = 2; break;
+			case NUM: kind = 3; break;
+			case STRING: kind = 4; break;
+			case REGEXP: kind = 5; break;
+			case NAME: kind = 6; break;
+			case KEYWORD: kind = 7; break;
+			case PUNCTUATOR: kind = 8; break;
+			}
+			trapwriter.addTuple("tokeninfo", key, kind, toplevelKey, idx++, token.getValue());
+			locationManager.emitNodeLocation(token, key);
+
+			// fill in next_token relation
+			while (j < comments.size() && comments.get(j).getLoc().getEnd().compareTo(token.getLoc().getStart()) < 0)
+				trapwriter.addTuple("next_token", this.trapwriter.localID(comments.get(j++)), key);
+
+			// the parser sometimes duplicates tokens; skip the second one by nulling it out
+			if (i+1 < n) {
+				Token next = tokens.get(i+1);
+				// every token has a unique location
+				if (token.getLoc().equals(next.getLoc()))
+					tokens.set(i+1, null);
+			}
+		}
+	}
+
+	public void extractComments(Label toplevelKey) {
+		for (Comment comment : comments) {
+			Label key = this.trapwriter.localID(comment);
+			String text = comment.getText();
+			int kind = -1;
+			switch (comment.getKind()) {
+			case LINE: kind = 0; break;
+			case HTML_START: kind = 3; break;
+			case HTML_END: kind = 4; break;
+			case BLOCK:
+				if (comment.isDocComment()) {
+					kind = 2;
+					text = text.substring(1);
+				} else {
+					kind = 1;
+				}
+				break;
+			}
+			String tostring = mkToString(comment);
+			this.trapwriter.addTuple("comments", key, kind, toplevelKey, text, tostring);
+			this.locationManager.emitNodeLocation(comment, key);
+		}
+	}
+
+	public String mkToString(SourceElement nd) {
+		return textualExtractor.mkToString(nd);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/LoCInfo.java b/javascript/extractor/src/com/semmle/js/extractor/LoCInfo.java
new file mode 100644
index 00000000000..a9e5c5ebb14
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/LoCInfo.java
@@ -0,0 +1,27 @@
+package com.semmle.js.extractor;
+
+/**
+ * Utility class for representing LoC information; really just a glorified
+ * <code>Pair&lt;Integer, Integer&gt;</code>.
+ */
+public class LoCInfo {
+	private int linesOfCode, linesOfComments;
+
+	public LoCInfo(int linesOfCode, int linesOfComments) {
+		this.linesOfCode = linesOfCode;
+		this.linesOfComments = linesOfComments;
+	}
+
+	public void add(LoCInfo that) {
+		this.linesOfCode += that.linesOfCode;
+		this.linesOfComments += that.linesOfComments;
+	}
+
+	public int getLinesOfCode() {
+		return linesOfCode;
+	}
+
+	public int getLinesOfComments() {
+		return linesOfComments;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/LocationManager.java b/javascript/extractor/src/com/semmle/js/extractor/LocationManager.java
new file mode 100644
index 00000000000..2457c3a3bde
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/LocationManager.java
@@ -0,0 +1,125 @@
+package com.semmle.js.extractor;
+
+import java.io.File;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * This class handles location information; in particular, it translates
+ * locations reported by the various parsers to absolute source file locations.
+ */
+public class LocationManager {
+	private final File sourceFile;
+	private final TrapWriter trapWriter;
+	private final Label fileLabel;
+	private int startColumn;
+	private int startLine;
+	private final Set<String> locationDefaultEmitted = new LinkedHashSet<String>();
+
+	public LocationManager(File sourceFile, TrapWriter trapWriter, Label fileLabel) {
+		this.sourceFile = sourceFile;
+		this.trapWriter = trapWriter;
+		this.fileLabel = fileLabel;
+		this.startLine = 1;
+		this.startColumn = 1;
+	}
+
+	public File getSourceFile() {
+		return sourceFile;
+	}
+
+	public String getSourceFileExtension() {
+		return FileUtil.extension(sourceFile);
+	}
+
+	public TrapWriter getTrapWriter() {
+		return trapWriter;
+	}
+
+	public Label getFileLabel() {
+		return fileLabel;
+	}
+
+	public int getStartLine() {
+		return startLine;
+	}
+
+	public int getStartColumn() {
+		return startColumn;
+	}
+
+	public void setStart(int line, int column) {
+		startLine = line;
+		startColumn = column;
+	}
+
+	/**
+	 * Emit location information for an AST node. The node's location is translated from the parser's
+	 * 0-based column numbering scheme into our 1-based scheme and then emitted as a snippet location.
+	 */
+	public void emitNodeLocation(SourceElement nd, Label lbl) {
+		int sl = nd.getLoc().getStart().getLine(),
+				sc = nd.getLoc().getStart().getColumn(),
+				el = nd.getLoc().getEnd().getLine(),
+				ec = nd.getLoc().getEnd().getColumn();
+		// adjust start column since the parser uses 0-based indexing
+		// (note: no adjustment needed for end column, since the parser also uses
+		// exclusive end columns)
+		sc++;
+
+		// standardise empty locations
+		if (el < sl || el == sl && ec < sc) {
+			el = sl;
+			ec = sc-1;
+		}
+
+		emitSnippetLocation(lbl, sl, sc, el, ec);
+	}
+
+	/** Emit a relative location in the current snippet. */
+	public void emitSnippetLocation(Label lbl, int sl, int sc, int el, int ec) {
+		Position start = translatePosition(new Position(sl, sc, -1));
+		Position end = translatePosition(new Position(el, ec, -1));
+		emitFileLocation(lbl, start.getLine(), start.getColumn(), end.getLine(), end.getColumn());
+	}
+
+	/** Emit an absolute location in the current file. No line or column adjustment is performed. */
+	public void emitFileLocation(Label lbl, int sl, int sc, int el, int ec) {
+		Label locLabel = emitLocationsDefault(sl, sc, el, ec);
+		trapWriter.addTuple("hasLocation", lbl, locLabel);
+	}
+
+	/** Emit an entry in the {@code locations_default} table. No line or column adjustment is performed. */
+	public Label emitLocationsDefault(int sl, int sc, int el, int ec) {
+		Label locLabel = trapWriter.location(fileLabel, sl, sc, el, ec);
+		if (locationDefaultEmitted.add(locLabel.toString()))
+			trapWriter.addTuple("locations_default", locLabel, fileLabel, sl, sc, el, ec);
+		return locLabel;
+	}
+
+	/** Emit location information for a parse error. These locations are special, since
+	 * their reported line number can be one past the last line in the file. Our toolchain does not like
+	 * such positions, so we artificially constrain the line number to be in an acceptable range. */
+	public void emitErrorLocation(Label lbl, Position pos, int numlines) {
+		int line = Math.max(1, Math.min(pos.getLine(), numlines));
+		int column = Math.max(1, pos.getColumn()+1);
+		this.emitSnippetLocation(lbl, line, column, line, column);
+	}
+
+	/**
+	 * Translate a relative position into an absolute position.
+	 */
+	public Position translatePosition(Position p) {
+		int line = p.getLine(), column = p.getColumn();
+		if (line == 1)
+			column += startColumn-1;
+		line += startLine-1;
+		return new Position(line, column, -1);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/Main.java b/javascript/extractor/src/com/semmle/js/extractor/Main.java
new file mode 100644
index 00000000000..9116a71dc0a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/Main.java
@@ -0,0 +1,450 @@
+package com.semmle.js.extractor;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+import com.semmle.js.extractor.ExtractorConfig.HTMLHandling;
+import com.semmle.js.extractor.ExtractorConfig.Platform;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.extractor.FileExtractor.FileType;
+import com.semmle.js.extractor.trapcache.DefaultTrapCache;
+import com.semmle.js.extractor.trapcache.DummyTrapCache;
+import com.semmle.js.extractor.trapcache.ITrapCache;
+import com.semmle.js.parser.ParsedProject;
+import com.semmle.js.parser.TypeScriptParser;
+import com.semmle.ts.extractor.TypeTable;
+import com.semmle.ts.extractor.TypeExtractor;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.data.UnitParser;
+import com.semmle.util.defect.Language;
+import com.semmle.util.exception.ResourceError;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.extraction.ExtractorOutputConfig;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.files.PathMatcher;
+import com.semmle.util.io.WholeIO;
+import com.semmle.util.process.ArgsParser;
+import com.semmle.util.process.ArgsParser.FileMode;
+import com.semmle.util.trap.TrapWriter;
+
+/**
+ * The main entry point of the JavaScript extractor.
+ */
+public class Main {
+	/**
+	 * A version identifier that should be updated every time the extractor changes in
+	 * such a way that it may produce different tuples for the same file under the same
+	 * {@link ExtractorConfig}.
+	 */
+	public static final String EXTRACTOR_VERSION = "2018-10-16";
+
+	public static final Pattern NEWLINE = Pattern.compile("\n");
+
+	// symbolic constants for command line parameter names
+	private static final String P_ABORT_ON_PARSE_ERRORS = "--abort-on-parse-errors";
+	private static final String P_DEBUG_EXCLUSIONS = "--debug-exclusions";
+	private static final String P_DEFAULT_ENCODING = "--default-encoding";
+	private static final String P_EXCLUDE = "--exclude";
+	private static final String P_EXPERIMENTAL = "--experimental";
+	private static final String P_EXTERNS = "--externs";
+	private static final String P_EXTRACT_PROGRAM_TEXT = "--extract-program-text";
+	private static final String P_FILE_TYPE = "--file-type";
+	private static final String P_HTML = "--html";
+	private static final String P_INCLUDE = "--include";
+	private static final String P_PLATFORM = "--platform";
+	private static final String P_QUIET = "--quiet";
+	private static final String P_SOURCE_TYPE = "--source-type";
+	private static final String P_TRAP_CACHE = "--trap-cache";
+	private static final String P_TRAP_CACHE_BOUND = "--trap-cache-bound";
+	private static final String P_TYPESCRIPT = "--typescript";
+	private static final String P_TYPESCRIPT_FULL = "--typescript-full";
+	private static final String P_TYPESCRIPT_RAM = "--typescript-ram";
+
+	// symbolic constants for deprecated command line parameter names
+	private static final String P_EXCLUDE_PATH = "--exclude-path";
+	private static final String P_TOLERATE_PARSE_ERRORS = "--tolerate-parse-errors";
+	private static final String P_NODEJS = "--nodejs";
+	private static final String P_MOZ_EXTENSIONS = "--mozExtensions";
+	private static final String P_JSCRIPT = "--jscript";
+	private static final String P_HELP = "--help";
+	private static final String P_ECMA_VERSION = "--ecmaVersion";
+
+	private final ExtractorOutputConfig extractorOutputConfig;
+	private ExtractorConfig extractorConfig;
+
+	private PathMatcher includeMatcher, excludeMatcher;
+	private FileExtractor fileExtractor;
+	private ExtractorState extractorState;
+	private final Set<File> projectFiles = new LinkedHashSet<>();
+	private final Set<File> files = new LinkedHashSet<>();
+	private final Set<File> extractedFiles = new LinkedHashSet<>();
+
+	/* used to detect cyclic directory hierarchies */
+	private final Set<String> seenDirectories = new LinkedHashSet<>();
+
+	/**
+	 * If true, the extractor state is shared with other extraction jobs.
+	 *
+	 * This is used by the test runner.
+	 */
+	private boolean hasSharedExtractorState = false;
+
+	public Main(ExtractorOutputConfig extractorOutputConfig) {
+		this.extractorOutputConfig = extractorOutputConfig;
+		this.extractorState = new ExtractorState();
+	}
+
+	public Main(ExtractorOutputConfig extractorOutputConfig, ExtractorState extractorState) {
+		this.extractorOutputConfig = extractorOutputConfig;
+		this.extractorState = extractorState;
+		this.hasSharedExtractorState = true;
+	}
+
+	public void run(String[] args) {
+		ArgsParser ap = addArgs(new ArgsParser(args));
+		ap.parse();
+
+		extractorConfig = parseJSOptions(ap);
+		ITrapCache trapCache;
+		if (ap.has(P_TRAP_CACHE)) {
+			Long sizeBound = null;
+			if (ap.has(P_TRAP_CACHE_BOUND)) {
+				String tcb = ap.getString(P_TRAP_CACHE_BOUND);
+				sizeBound = DefaultTrapCache.asFileSize(tcb);
+				if (sizeBound == null)
+					ap.error("Invalid TRAP cache size bound: " + tcb);
+			}
+			trapCache = new DefaultTrapCache(ap.getString(P_TRAP_CACHE), sizeBound, EXTRACTOR_VERSION);
+		} else {
+			if (ap.has(P_TRAP_CACHE_BOUND))
+				ap.error(P_TRAP_CACHE_BOUND + " should only be specified together with " + P_TRAP_CACHE + ".");
+			trapCache = new DummyTrapCache();
+		}
+		fileExtractor = new FileExtractor(extractorConfig, extractorOutputConfig, trapCache, extractorState);
+
+		setupMatchers(ap);
+
+		collectFiles(ap);
+
+		if (files.isEmpty()) {
+			verboseLog(ap, "Nothing to extract.");
+			return;
+		}
+
+		TypeScriptParser tsParser = extractorState.getTypeScriptParser();
+		tsParser.setTypescriptRam(extractorConfig.getTypeScriptRam());
+		if (containsTypeScriptFiles()) {
+			tsParser.verifyInstallation(!ap.has(P_QUIET));
+		}
+		for (File projectFile : projectFiles) {
+			long start = verboseLogStartTimer(ap, "Opening project " + projectFile);
+			ParsedProject project = tsParser.openProject(projectFile);
+			verboseLogEndTimer(ap, start);
+			// Extract all files belonging to this project which are also matched
+			// by our include/exclude filters.
+			for (File sourceFile : project.getSourceFiles()) {
+				if (files.contains(normalizeFile(sourceFile))) {
+					ensureFileIsExtracted(sourceFile, ap);
+				}
+			}
+			// Close the project to free memory. This does not need to be in a `finally` as
+			// the project is not a system resource.
+			tsParser.closeProject(projectFile);
+		}
+
+		if (!projectFiles.isEmpty()) {
+			// Extract all the types discovered when extracting the ASTs.
+			TypeTable typeTable = tsParser.getTypeTable();
+			extractTypeTable(projectFiles.iterator().next(), typeTable);
+
+			// The TypeScript compiler instance is no longer needed - free up some memory.
+			if (hasSharedExtractorState) {
+				tsParser.reset(); // This is called from a test runner, so keep the process alive.
+			} else {
+				tsParser.killProcess();
+			}
+		}
+
+		// Extract files that were not part of a project.
+		for (File f : files) {
+			ensureFileIsExtracted(f, ap);
+		}
+	}
+
+	private void extractTypeTable(File fileHandle, TypeTable table) {
+		TrapWriter trapWriter = extractorOutputConfig.getTrapWriterFactory().mkTrapWriter(fileHandle);
+		try {
+			new TypeExtractor(trapWriter, table).extract();
+		} finally {
+			FileUtil.close(trapWriter);
+		}
+	}
+
+	private void ensureFileIsExtracted(File f, ArgsParser ap) {
+		if (!extractedFiles.add(f.getAbsoluteFile())) {
+			// The file has already been extracted as part of a project.
+			return;
+		}
+		long start = verboseLogStartTimer(ap, "Extracting " + f);
+		try {
+			fileExtractor.extract(f.getAbsoluteFile());
+			verboseLogEndTimer(ap, start);
+		} catch (IOException e) {
+			throw new ResourceError("Extraction of " + f + " failed.", e);
+		}
+	}
+
+	private void verboseLog(ArgsParser ap, String message) {
+		if (!ap.has(P_QUIET)) {
+			System.out.println(message);
+		}
+	}
+
+	private long verboseLogStartTimer(ArgsParser ap, String message) {
+		if (!ap.has(P_QUIET)) {
+			System.out.print(message + "...");
+			System.out.flush();
+		}
+		return System.currentTimeMillis();
+	}
+
+	private void verboseLogEndTimer(ArgsParser ap, long start) {
+		long end = System.currentTimeMillis();
+		if (!ap.has(P_QUIET)) {
+			System.out.println(" done (" + (end - start) / 1000 + " seconds).");
+		}
+	}
+
+	/**
+	 * Returns true if the project contains a TypeScript file to be extracted.
+	 */
+	private boolean containsTypeScriptFiles() {
+		for (File file : files) {
+			// The file headers have already been checked, so don't use I/O.
+			if (FileType.forFileExtension(file) == FileType.TYPESCRIPT) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public void collectFiles(ArgsParser ap) {
+		for (File f : ap.getOneOrMoreFiles("files", FileMode.FILE_OR_DIRECTORY_MUST_EXIST))
+			collectFiles(f, true);
+	}
+
+	public void setupMatchers(ArgsParser ap) {
+		Set<String> includes = new LinkedHashSet<>();
+
+		// only extract HTML and JS by default
+		addIncludesFor(includes, FileType.HTML);
+		addIncludesFor(includes, FileType.JS);
+
+		// extract TypeScript if `--typescript` or `--typescript-full` was specified
+		if (getTypeScriptMode(ap) != TypeScriptMode.NONE)
+			addIncludesFor(includes, FileType.TYPESCRIPT);
+
+		// add explicit include patterns
+		for (String pattern : ap.getZeroOrMore(P_INCLUDE))
+			addPathPattern(includes, System.getProperty("user.dir"), pattern);
+		this.includeMatcher = new PathMatcher(includes);
+
+		// if we are extracting (potential) Node.js code, we also want to
+		// include package.json files, and files without extension
+		if (getPlatform(ap) != Platform.WEB) {
+			PathMatcher innerIncludeMatcher = this.includeMatcher;
+			this.includeMatcher = new PathMatcher("**/package.json") {
+				@Override
+				public boolean matches(String path) {
+					// match files without extension
+					String basename = path.substring(path.lastIndexOf(File.separatorChar)+1);
+					if (FileUtil.extension(basename).isEmpty())
+						return true;
+
+					// match package.json and anything matched by the inner matcher
+					return super.matches(path) || innerIncludeMatcher.matches(path);
+				}
+			};
+		}
+
+		Set<String> excludes = new LinkedHashSet<>();
+		for (String pattern : ap.getZeroOrMore(P_EXCLUDE))
+			addPathPattern(excludes, System.getProperty("user.dir"), pattern);
+		for (String excl : ap.getZeroOrMore(P_EXCLUDE_PATH)) {
+			File exclFile = new File(excl).getAbsoluteFile();
+			String base = exclFile.getParent();
+			for (String pattern : NEWLINE.split(new WholeIO().strictread(exclFile)))
+				addPathPattern(excludes, base, pattern);
+		}
+		this.excludeMatcher = new PathMatcher(excludes);
+
+		if (ap.has(P_DEBUG_EXCLUSIONS)) {
+			System.out.println("Inclusion patterns: " + this.includeMatcher);
+			System.out.println("Exclusion patterns: " + this.excludeMatcher);
+		}
+	}
+
+	private void addIncludesFor(Set<String> includes, FileType filetype) {
+		for (String extension : filetype.getExtensions())
+			includes.add("**/*" + extension);
+	}
+
+	private void addPathPattern(Set<String> patterns, String base, String pattern) {
+		pattern = pattern.trim();
+		if (pattern.isEmpty())
+			return;
+		if (!FileUtil.isAbsolute(pattern) && base != null) {
+			pattern = base + "/" + pattern;
+		}
+		if (pattern.endsWith("/"))
+			pattern = pattern.substring(0, pattern.length()-1);
+		patterns.add(pattern);
+	}
+
+	private ArgsParser addArgs(ArgsParser argsParser) {
+		argsParser.addDeprecatedFlag(P_ECMA_VERSION, 1, "Files are now always extracted as ECMAScript 2017.");
+		argsParser.addFlag(P_EXCLUDE, 1, "Do not extract files matching the given filename pattern.", true);
+		argsParser.addToleratedFlag(P_EXCLUDE_PATH, 1, true);
+		argsParser.addFlag(P_EXPERIMENTAL, 0, "Enable experimental support for pending ECMAScript proposals "
+				+ "(public class fields, function.sent, decorators, export extensions, function bind, "
+				+ "parameter-less catch, dynamic import, numeric separators, bigints), "
+				+ "as well as other language extensions (JScript, Mozilla and v8-specific extensions) and full HTML extraction.");
+		argsParser.addFlag(P_EXTERNS, 0, "Extract the given JavaScript files as Closure-style externs.");
+		argsParser.addFlag(P_EXTRACT_PROGRAM_TEXT, 0, "Extract a representation of the textual content of the program "
+				+ "(in addition to its syntactic structure).");
+		argsParser.addFlag(P_FILE_TYPE, 1, "Assume all files to be of the given type, regardless of extension; "
+				+ "the type must be one of " + StringUtil.glue(", ", FileExtractor.FileType.allNames) + ".");
+		argsParser.addFlag(P_HELP, 0, "Display this help.");
+		argsParser.addFlag(P_HTML, 1, "Control extraction of HTML files: "
+				+ "'scripts' extracts JavaScript code embedded inside HTML, but not the HTML itself; "
+				+ "'elements' additionally extracts HTML elements and their attributes, as well as HTML comments, but not textual content (default); "
+				+ "'all' extracts elements, embedded scripts, comments and text.");
+		argsParser.addFlag(P_INCLUDE, 1, "Extract files matching the given filename pattern (in addition to HTML and JavaScript files).", true);
+		argsParser.addDeprecatedFlag(P_JSCRIPT, 0, "Use '" + P_EXPERIMENTAL + "' instead.");
+		argsParser.addDeprecatedFlag(P_MOZ_EXTENSIONS, 0, "Use '" + P_EXPERIMENTAL + "' instead.");
+		argsParser.addDeprecatedFlag(P_NODEJS, 0, "Use '" + P_PLATFORM + " node' instead.");
+		argsParser.addFlag(P_PLATFORM, 1, "Extract the given JavaScript files as code for the given platform: "
+				+ "'node' extracts them as Node.js modules; "
+				+ "'web' as plain JavaScript files; "
+				+ "'auto' uses heuristics to automatically detect "
+				+ "Node.js modules and extracts everything else as plain JavaScript files. "
+				+ "The default is 'auto'.");
+		argsParser.addFlag(P_QUIET, 0, "Produce less output.");
+		argsParser.addFlag(P_SOURCE_TYPE, 1, "The source type to use; must be one of 'script', 'module' or 'auto'. "
+				+ "The default is 'auto'.");
+		argsParser.addToleratedFlag(P_TOLERATE_PARSE_ERRORS, 0);
+		argsParser.addFlag(P_ABORT_ON_PARSE_ERRORS, 0, "Abort extraction if a parse error is encountered.");
+		argsParser.addFlag(P_TRAP_CACHE, 1, "Use the given directory as the TRAP cache.");
+		argsParser.addFlag(P_TRAP_CACHE_BOUND, 1, "A (soft) upper limit on the size of the TRAP cache, "
+				+ "in standard size units (e.g., 'g' for gigabytes).");
+		argsParser.addFlag(P_DEFAULT_ENCODING, 1, "The encoding to use; default is UTF-8.");
+		argsParser.addFlag(P_TYPESCRIPT, 0, "Enable basic TypesScript support.");
+		argsParser.addFlag(P_TYPESCRIPT_FULL, 0, "Enable full TypeScript support with static type information.");
+		argsParser.addFlag(P_TYPESCRIPT_RAM, 1, "Amount of memory allocated to the TypeScript compiler process. The default is 1G.");
+		argsParser.addToleratedFlag(P_DEBUG_EXCLUSIONS, 0);
+		argsParser.addTrailingParam("files", "Files and directories to extract.");
+		return argsParser;
+	}
+
+	private boolean enableExperimental(ArgsParser ap) {
+		return ap.has(P_EXPERIMENTAL) || ap.has(P_JSCRIPT) || ap.has(P_MOZ_EXTENSIONS);
+	}
+
+	private static TypeScriptMode getTypeScriptMode(ArgsParser ap) {
+		if (ap.has(P_TYPESCRIPT_FULL))
+			return TypeScriptMode.FULL;
+		if (ap.has(P_TYPESCRIPT))
+			return TypeScriptMode.BASIC;
+		return TypeScriptMode.NONE;
+	}
+
+	private ExtractorConfig parseJSOptions(ArgsParser ap) {
+		ExtractorConfig cfg = new ExtractorConfig(enableExperimental(ap))
+				.withExterns(ap.has(P_EXTERNS))
+				.withPlatform(getPlatform(ap))
+				.withTolerateParseErrors(ap.has(P_TOLERATE_PARSE_ERRORS) || !ap.has(P_ABORT_ON_PARSE_ERRORS))
+				.withHtmlHandling(ap.getEnum(P_HTML, HTMLHandling.class, ap.has(P_EXPERIMENTAL)? HTMLHandling.ALL: HTMLHandling.ELEMENTS))
+				.withFileType(getFileType(ap))
+				.withSourceType(ap.getEnum(P_SOURCE_TYPE, SourceType.class, SourceType.AUTO))
+				.withExtractLines(ap.has(P_EXTRACT_PROGRAM_TEXT))
+				.withTypeScriptMode(getTypeScriptMode(ap)).withTypeScriptRam(
+						ap.has(P_TYPESCRIPT_RAM) ? UnitParser.parseOpt(ap.getString(P_TYPESCRIPT_RAM), UnitParser.MEGABYTES) : 0);
+		if (ap.has(P_DEFAULT_ENCODING))
+			cfg = cfg.withDefaultEncoding(ap.getString(P_DEFAULT_ENCODING));
+		return cfg;
+	}
+
+	private String getFileType(ArgsParser ap) {
+		String fileType = null;
+		if (ap.has(P_FILE_TYPE)) {
+			fileType = StringUtil.uc(ap.getString(P_FILE_TYPE));
+			if (!FileExtractor.FileType.allNames.contains(fileType))
+				ap.error("Invalid file type " + ap.getString(P_FILE_TYPE));
+		}
+		return fileType;
+	}
+
+	private Platform getPlatform(ArgsParser ap) {
+		if (ap.has(P_NODEJS))
+			return Platform.NODE;
+		return ap.getEnum(P_PLATFORM, Platform.class, Platform.AUTO);
+	}
+
+	/**
+	 * Collect files to extract under a given root, which may be either a file
+	 * or a directory. The {@code explicit} flag indicates whether {@code root}
+	 * was explicitly passed to the extractor as a command line argument, or
+	 * whether it is examined as part of a recursive traversal.
+	 */
+	private void collectFiles(File root, boolean explicit) {
+		if (!root.exists()) {
+			System.err.println("Skipping " + root + ", which does not exist.");
+			return;
+		}
+
+		if (root.isDirectory()) {
+			// exclude directories we've seen before
+			if (seenDirectories.add(FileUtil.tryMakeCanonical(root).getPath()))
+				// apply exclusion filters for directories
+				if (!excludeMatcher.matches(root.getAbsolutePath())) {
+					File[] gs = root.listFiles();
+					if (gs == null)
+						System.err.println("Skipping " + root + ", which cannot be listed.");
+					else
+						for (File g : gs)
+							collectFiles(g, false);
+				}
+		} else {
+			String path = root.getAbsolutePath();
+
+			// extract files that are supported, match the layout (if any), pass the includeMatcher,
+			// and do not pass the excludeMatcher
+			if (fileExtractor.supports(root) && extractorOutputConfig.shouldExtract(root) &&
+					(explicit || includeMatcher.matches(path) && !excludeMatcher.matches(path))) {
+				files.add(normalizeFile(root));
+			}
+
+			if (extractorConfig.getTypeScriptMode() == TypeScriptMode.FULL && root.getName().equals("tsconfig.json")
+					&& !excludeMatcher.matches(path)) {
+				projectFiles.add(root);
+			}
+		}
+	}
+
+	private File normalizeFile(File root) {
+		return root.getAbsoluteFile().toPath().normalize().toFile();
+	}
+
+	public static void main(String[] args) {
+		try {
+			new Main(new ExtractorOutputConfig(Language.JAVASCRIPT)).run(args);
+		} catch (UserError e) {
+			System.err.println(e.getMessage());
+			if (!e.reportAsInfoMessage())
+				System.exit(1);
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/NodeJSDetector.java b/javascript/extractor/src/com/semmle/js/extractor/NodeJSDetector.java
new file mode 100644
index 00000000000..045343e9570
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/NodeJSDetector.java
@@ -0,0 +1,185 @@
+package com.semmle.js.extractor;
+
+import java.util.List;
+
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.IFunction;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+
+/**
+ * A utility class for detecting Node.js code.
+ */
+public class NodeJSDetector {
+	/**
+	 * Is {@code ast} a program that looks like Node.js code, that is,
+	 * does it contain a top-level {@code require} or an export?
+	 */
+	public static boolean looksLikeNodeJS(Node ast) {
+		if (!(ast instanceof Program))
+			return false;
+
+		return hasToplevelRequireOrExport(((Program) ast).getBody());
+	}
+
+	/**
+	 * Does this program contain a statement that looks like a Node.js {@code require}
+	 * or an export?
+	 *
+	 * We recursively traverse argument-less immediately invoked function expressions
+	 * (i.e., no UMD modules), but not loops or if statements.
+	 */
+	private static boolean hasToplevelRequireOrExport(List<Statement> stmts) {
+		for (Statement stmt : stmts)
+			if (hasToplevelRequireOrExport(stmt))
+				return true;
+		return false;
+	}
+
+	private static boolean hasToplevelRequireOrExport(Statement stmt) {
+		if (stmt instanceof ExpressionStatement) {
+			Expression e = stripParens(((ExpressionStatement) stmt).getExpression());
+
+			// check whether `e` is an iife; if so, recursively check its body
+
+			// strip off unary operators to handle `!function(){...}()`
+			if (e instanceof UnaryExpression)
+				e = ((UnaryExpression) e).getArgument();
+
+			if (e instanceof CallExpression && ((CallExpression) e).getArguments().isEmpty()) {
+				Expression callee = stripParens(((CallExpression) e).getCallee());
+				if (callee instanceof IFunction) {
+					Node body = ((IFunction) callee).getBody();
+					if (body instanceof BlockStatement)
+						return hasToplevelRequireOrExport(((BlockStatement) body).getBody());
+				}
+			}
+
+			if (isRequireCall(e) || isExport(e))
+				return true;
+
+		} else if (stmt instanceof VariableDeclaration) {
+			for (VariableDeclarator decl : ((VariableDeclaration) stmt).getDeclarations()) {
+				Expression init = stripParens(decl.getInit());
+				if (isRequireCall(init) || isExport(init))
+					return true;
+			}
+
+		} else if (stmt instanceof TryStatement) {
+			return hasToplevelRequireOrExport(((TryStatement) stmt).getBlock());
+
+		} else if (stmt instanceof BlockStatement) {
+			return hasToplevelRequireOrExport(((BlockStatement) stmt).getBody());
+
+		} else if (stmt instanceof IfStatement) {
+			IfStatement is = (IfStatement) stmt;
+			return hasToplevelRequireOrExport(is.getConsequent())
+					|| hasToplevelRequireOrExport(is.getAlternate());
+		}
+
+		return false;
+	}
+
+	private static Expression stripParens(Expression e) {
+		if (e instanceof ParenthesizedExpression)
+			return stripParens(((ParenthesizedExpression) e).getExpression());
+		return e;
+	}
+
+	/**
+	 * Is {@code e} a call to a function named {@code require} with one argument,
+	 * or an assignment whose right hand side is the result of such a call?
+	 */
+	private static boolean isRequireCall(Expression e) {
+		if (e instanceof CallExpression) {
+			CallExpression call = (CallExpression) e;
+			Expression callee = call.getCallee();
+			return (isIdentifier(callee, "require") || isRequireCall(callee)) &&
+					call.getArguments().size() == 1;
+		} else if (e instanceof MemberExpression) {
+			return isRequireCall(((MemberExpression) e).getObject());
+		} else if (e instanceof AssignmentExpression) {
+			AssignmentExpression assgn = (AssignmentExpression) e;
+
+			// filter out compound assignments
+			if (!"=".equals(assgn.getOperator()))
+				return false;
+
+			return isRequireCall(assgn.getRight());
+		}
+		return false;
+	}
+
+	/**
+	 * Does {@code e} look like a Node.js export?
+	 *
+	 * Currently, three kinds of exports are recognised:
+	 * <ul>
+	 *   <li> <code>exports.foo = ...</code>
+	 *   <li> <code>module.exports = ...</code>
+	 *   <li> <code>module.exports.foo = ...</code>
+	 * </ul>
+	 *
+	 * Detection is done recursively, so <code>foo = exports.foo = ...</code>
+	 * is handled correctly.
+	 */
+	private static boolean isExport(Expression e) {
+		if (e instanceof AssignmentExpression) {
+			AssignmentExpression assgn = (AssignmentExpression) e;
+
+			// filter out compound assignments
+			if (!"=".equals(assgn.getOperator()))
+				return false;
+
+			if (assgn.getLeft() instanceof MemberExpression) {
+				MemberExpression target = (MemberExpression) assgn.getLeft();
+
+				// `exports.foo = ...;`
+				if (isIdentifier(target.getObject(), "exports"))
+					return true;
+
+				// `module.exports = ...;`
+				if (isModuleExports(target))
+					return true;
+
+				if (target.getObject() instanceof MemberExpression) {
+					MemberExpression targetBase = (MemberExpression) target.getObject();
+
+					// `module.exports.foo = ...;`
+					if (isModuleExports(targetBase))
+						return true;
+				}
+			}
+
+			// recursively check right hand side
+			return isExport(assgn.getRight());
+		}
+
+		return false;
+	}
+
+	/** Is {@code me} a member expression {@code module.exports}? */
+	private static boolean isModuleExports(MemberExpression me) {
+		return !me.isComputed() &&
+				isIdentifier(me.getObject(), "module") &&
+				isIdentifier(me.getProperty(), "exports");
+	}
+
+	/** Is {@code e} an identifier with name {@code name}? */
+	private static boolean isIdentifier(Expression e, String name) {
+		return e instanceof Identifier && name.equals(((Identifier) e).getName());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/RegExpExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/RegExpExtractor.java
new file mode 100644
index 00000000000..219c3fa7612
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/RegExpExtractor.java
@@ -0,0 +1,372 @@
+package com.semmle.js.extractor;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.regexp.BackReference;
+import com.semmle.js.ast.regexp.Caret;
+import com.semmle.js.ast.regexp.CharacterClass;
+import com.semmle.js.ast.regexp.CharacterClassEscape;
+import com.semmle.js.ast.regexp.CharacterClassRange;
+import com.semmle.js.ast.regexp.Constant;
+import com.semmle.js.ast.regexp.ControlEscape;
+import com.semmle.js.ast.regexp.ControlLetter;
+import com.semmle.js.ast.regexp.DecimalEscape;
+import com.semmle.js.ast.regexp.Disjunction;
+import com.semmle.js.ast.regexp.Dollar;
+import com.semmle.js.ast.regexp.Dot;
+import com.semmle.js.ast.regexp.Error;
+import com.semmle.js.ast.regexp.Group;
+import com.semmle.js.ast.regexp.HexEscapeSequence;
+import com.semmle.js.ast.regexp.IdentityEscape;
+import com.semmle.js.ast.regexp.Literal;
+import com.semmle.js.ast.regexp.NamedBackReference;
+import com.semmle.js.ast.regexp.NonWordBoundary;
+import com.semmle.js.ast.regexp.OctalEscape;
+import com.semmle.js.ast.regexp.Opt;
+import com.semmle.js.ast.regexp.Plus;
+import com.semmle.js.ast.regexp.Quantifier;
+import com.semmle.js.ast.regexp.Range;
+import com.semmle.js.ast.regexp.RegExpTerm;
+import com.semmle.js.ast.regexp.Sequence;
+import com.semmle.js.ast.regexp.Star;
+import com.semmle.js.ast.regexp.UnicodeEscapeSequence;
+import com.semmle.js.ast.regexp.UnicodePropertyEscape;
+import com.semmle.js.ast.regexp.Visitor;
+import com.semmle.js.ast.regexp.WordBoundary;
+import com.semmle.js.ast.regexp.ZeroWidthNegativeLookahead;
+import com.semmle.js.ast.regexp.ZeroWidthNegativeLookbehind;
+import com.semmle.js.ast.regexp.ZeroWidthPositiveLookahead;
+import com.semmle.js.ast.regexp.ZeroWidthPositiveLookbehind;
+import com.semmle.js.parser.RegExpParser;
+import com.semmle.js.parser.RegExpParser.Result;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating regular expressions.
+ */
+public class RegExpExtractor {
+	private final TrapWriter trapwriter;
+	private final LocationManager locationManager;
+	private final RegExpParser parser = new RegExpParser();
+	private Position literalStart;
+
+	public RegExpExtractor(TrapWriter trapwriter, LocationManager locationManager) {
+		this.trapwriter = trapwriter;
+		this.locationManager = locationManager;
+	}
+
+	private static final Map<String, Integer> termkinds = new LinkedHashMap<String, Integer>();
+	static {
+		termkinds.put("Disjunction", 0);
+		termkinds.put("Sequence", 1);
+		termkinds.put("Caret", 2);
+		termkinds.put("Dollar", 3);
+		termkinds.put("WordBoundary", 4);
+		termkinds.put("NonWordBoundary", 5);
+		termkinds.put("ZeroWidthPositiveLookahead", 6);
+		termkinds.put("ZeroWidthNegativeLookahead", 7);
+		termkinds.put("Star", 8);
+		termkinds.put("Plus", 9);
+		termkinds.put("Opt", 10);
+		termkinds.put("Range", 11);
+		termkinds.put("Dot", 12);
+		termkinds.put("Group", 13);
+		termkinds.put("Constant", 14);
+		termkinds.put("HexEscapeSequence", 15);
+		termkinds.put("UnicodeEscapeSequence", 16);
+		termkinds.put("DecimalEscape", 17);
+		termkinds.put("OctalEscape", 18);
+		termkinds.put("ControlEscape", 19);
+		termkinds.put("ControlLetter", 19); // not a typo; these two are merged in the database
+		termkinds.put("CharacterClassEscape", 20);
+		termkinds.put("IdentityEscape", 21);
+		termkinds.put("BackReference", 22);
+		termkinds.put("CharacterClass", 23);
+		termkinds.put("CharacterClassRange", 24);
+		termkinds.put("NamedBackReference", 22); // merged with BackReference in the database
+		termkinds.put("ZeroWidthPositiveLookbehind", 25);
+		termkinds.put("ZeroWidthNegativeLookbehind", 26);
+		termkinds.put("UnicodePropertyEscape", 27);
+	}
+
+	/** This has to be kept consistent with esregex. */
+	private static final String[] errmsgs = new String[] {
+		"unexpected end of regular expression",
+		"unexpected character",
+		"expected digit",
+		"expected hexadecimal digit",
+		"expected control letter",
+		"expected ')'",
+		"expected '}'",
+		"trailing characters",
+		"octal escape sequence",
+		"invalid back reference",
+		"expected ']'",
+		"expected identifier",
+		"expected '>'"
+	};
+
+	private Label extractTerm(RegExpTerm term, Label parent, int idx) {
+		Label lbl = trapwriter.localID(term);
+		int kind = termkinds.get(term.getType());
+		String srctext = term.getLoc().getSource();
+		this.trapwriter.addTuple("regexpterm", lbl, kind, parent, idx, srctext);
+		emitLocation(term, lbl);
+		return lbl;
+	}
+
+	public void emitLocation(SourceElement term, Label lbl) {
+		int sl, sc, el, ec;
+		sl = el = literalStart.getLine();
+		sc = literalStart.getColumn() + 2 + term.getLoc().getStart().getColumn();
+		ec = literalStart.getColumn() + 1 + term.getLoc().getEnd().getColumn();
+		locationManager.emitSnippetLocation(lbl, sl, sc, el, ec);
+	}
+
+	private class V implements Visitor {
+		private Label parent;
+		private int idx;
+
+		private void visit(RegExpTerm child, Label parent, int idx) {
+			Label oldParent = this.parent;
+			int oldIdx = this.idx;
+
+			this.parent = parent;
+			this.idx = idx;
+
+			child.accept(this);
+
+			this.parent = oldParent;
+			this.idx = oldIdx;
+		}
+
+		@Override
+		public void visit(BackReference nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			if (inRange(nd.getValue()))
+				trapwriter.addTuple("backref", lbl, nd.getValue());
+		}
+
+		@Override
+		public void visit(NamedBackReference nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			trapwriter.addTuple("namedBackref", lbl, nd.getName());
+		}
+
+		@Override
+		public void visit(Caret nd) {
+			extractTerm(nd, parent, idx);
+		}
+
+		@Override
+		public void visit(Dot nd) {
+			extractTerm(nd, parent, idx);
+		}
+
+		@Override
+		public void visit(Constant nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(Dollar nd) {
+			extractTerm(nd, parent, idx);
+		}
+
+		@Override
+		public void visit(Group nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			if (nd.isCapture())
+				trapwriter.addTuple("isCapture", lbl, nd.getNumber());
+			if (nd.isNamed())
+				trapwriter.addTuple("isNamedCapture", lbl, nd.getName());
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(ZeroWidthPositiveLookahead nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(ZeroWidthNegativeLookahead nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(ZeroWidthPositiveLookbehind nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(ZeroWidthNegativeLookbehind nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(NonWordBoundary nd) {
+			extractTerm(nd, parent, idx);
+		}
+
+		private void visit(Quantifier nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			if (nd.isGreedy())
+				trapwriter.addTuple("isGreedy", lbl);
+			visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(Opt nd) {
+			visit((Quantifier)nd);
+		}
+
+		@Override
+		public void visit(Plus nd) {
+			visit((Quantifier)nd);
+		}
+
+		private boolean inRange(long l) {
+			return 0 <= l && l <= Integer.MAX_VALUE;
+		}
+
+		@Override
+		public void visit(Range nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			if (nd.isGreedy())
+				trapwriter.addTuple("isGreedy", lbl);
+
+			long lo = nd.getLowerBound();
+			if (inRange(lo))
+				trapwriter.addTuple("rangeQuantifierLowerBound", lbl, lo);
+
+			if (nd.hasUpperBound()) {
+				long hi = nd.getUpperBound();
+				if (inRange(hi))
+					trapwriter.addTuple("rangeQuantifierUpperBound", lbl, hi);
+			}
+
+			this.visit(nd.getOperand(), lbl, 0);
+		}
+
+		@Override
+		public void visit(Sequence nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			int i = 0;
+			for (RegExpTerm element : nd.getElements())
+				visit(element, lbl, i++);
+		}
+
+		@Override
+		public void visit(Disjunction nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			int i = 0;
+			for (RegExpTerm element : nd.getDisjuncts())
+				visit(element, lbl, i++);
+		}
+
+		@Override
+		public void visit(Star nd) {
+			visit((Quantifier)nd);
+		}
+
+		@Override
+		public void visit(WordBoundary nd) {
+			extractTerm(nd, parent, idx);
+		}
+
+		@Override
+		public void visit(CharacterClassEscape nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			trapwriter.addTuple("charClassEscape", lbl, nd.getClassIdentifier());
+		}
+
+		@Override
+		public void visit(UnicodePropertyEscape nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			trapwriter.addTuple("unicodePropertyEscapeName", lbl, nd.getName());
+			if (nd.hasValue())
+				trapwriter.addTuple("unicodePropertyEscapeValue", lbl, nd.getValue());
+		}
+
+		@Override
+		public void visit(DecimalEscape nd) {
+			visit((Literal)nd);
+		}
+
+		private void visit(Literal nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			trapwriter.addTuple("regexpConstValue", lbl, nd.getValue());
+		}
+
+		@Override
+		public void visit(HexEscapeSequence nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(OctalEscape nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(UnicodeEscapeSequence nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(ControlEscape nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(ControlLetter nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(IdentityEscape nd) {
+			visit((Literal)nd);
+		}
+
+		@Override
+		public void visit(CharacterClass nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			if (nd.isInverted())
+				trapwriter.addTuple("isInverted", lbl);
+			int i = 0;
+			for (RegExpTerm element : nd.getElements())
+				visit(element, lbl, i++);
+		}
+
+		@Override
+		public void visit(CharacterClassRange nd) {
+			Label lbl = extractTerm(nd, parent, idx);
+			visit(nd.getLeft(), lbl, 0);
+			visit(nd.getRight(), lbl, 1);
+		}
+	}
+
+	public void extract(String src, Node parent) {
+		this.literalStart = parent.getLoc().getStart();
+		Result res = parser.parse(src);
+		RegExpTerm ast = res.getAST();
+		new V().visit(ast, trapwriter.localID(parent), 0);
+
+		Label rootLbl = trapwriter.localID(ast);
+		for (Error err : res.getErrors()) {
+			Label lbl = this.trapwriter.freshLabel();
+			String msg = errmsgs[err.getCode()];
+			this.trapwriter.addTuple("regexpParseErrors", lbl, rootLbl, msg);
+			this.emitLocation(err, lbl);
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ScopeManager.java b/javascript/extractor/src/com/semmle/js/extractor/ScopeManager.java
new file mode 100644
index 00000000000..3a3a4582eda
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ScopeManager.java
@@ -0,0 +1,744 @@
+package com.semmle.js.extractor;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.EnhancedForStatement;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.FunctionExpression;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportNamespaceSpecifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.LetExpression;
+import com.semmle.js.ast.LetStatement;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.extractor.ExtractorConfig.ECMAVersion;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.UnionTypeExpr;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Class for maintaining scoping information during extraction.
+ */
+public class ScopeManager {
+	public static class Scope {
+		private final Scope outer;
+		private final Label scopeLabel;
+		private final HashMap<String, Label> variableBindings = new LinkedHashMap<String, Label>();
+		private final HashMap<String, Label> typeBindings = new LinkedHashMap<String, Label>();
+		private final HashMap<String, Label> namespaceBindings = new LinkedHashMap<String, Label>();
+
+		public Scope(Scope outer, Label scopeLabel) {
+			this.outer = outer;
+			this.scopeLabel = scopeLabel;
+		}
+
+		public Label lookupVariable(String name) {
+			Label l = variableBindings.get(name);
+			if (l == null && outer != null)
+				return outer.lookupVariable(name);
+			return l;
+		}
+
+		public Label lookupType(String name) {
+			Label l = typeBindings.get(name);
+			if (l == null && outer != null)
+				return outer.lookupType(name);
+			return l;
+		}
+
+		public Label lookupNamespace(String name) {
+			Label l = namespaceBindings.get(name);
+			if (l == null && outer != null)
+				return outer.lookupNamespace(name);
+			return l;
+		}
+	}
+
+	private final TrapWriter trapWriter;
+	private Scope curScope;
+	private final Scope toplevelScope;
+	private final ECMAVersion ecmaVersion;
+	private final Set<String> implicitGlobals = new LinkedHashSet<String>();
+
+	public ScopeManager(TrapWriter trapWriter, ECMAVersion ecmaVersion) {
+		this.trapWriter = trapWriter;
+		this.toplevelScope = enterScope(0, trapWriter.globalID("global_scope"), null);
+		this.ecmaVersion = ecmaVersion;
+	}
+
+	/**
+	 * Enter a new scope.
+	 *
+	 * @param scopeKind the numeric scope kind
+	 * @param scopeLabel the label of the scope itself
+	 * @param scopeNodeLabel the label of the AST node inducing this scope; may be null
+	 */
+	public Scope enterScope(int scopeKind, Label scopeLabel, Label scopeNodeLabel) {
+		Label outerScopeLabel = curScope == null ? null : curScope.scopeLabel;
+
+		curScope = new Scope(curScope, scopeLabel);
+
+		trapWriter.addTuple("scopes", curScope.scopeLabel, scopeKind);
+		if (scopeNodeLabel != null)
+			trapWriter.addTuple("scopenodes", scopeNodeLabel, curScope.scopeLabel);
+		if (outerScopeLabel != null)
+			trapWriter.addTuple("scopenesting", curScope.scopeLabel, outerScopeLabel);
+
+		return curScope;
+	}
+
+	/**
+	 * Enter the scope induced by a given AST node.
+	 */
+	public Scope enterScope(Node scopeNode) {
+		return enterScope(scopeKinds.get(scopeNode.getType()), trapWriter.freshLabel(), trapWriter.localID(scopeNode));
+	}
+
+	/**
+	 * Enters a scope for a block of form <tt>declare global { ... }</tt>.
+	 * <p>
+	 * Declarations in this block will contribute to the global scope, but
+	 * references can still be resolved in the scope enclosing the declaration
+	 * itself. The scope itself does not have its own label and will thus not exist
+	 * at the QL level.
+	 */
+	public void enterGlobalAugmentationScope() {
+		curScope = new Scope(curScope, toplevelScope.scopeLabel);
+	}
+
+	/**
+	 * Re-enter a scope that was previously established.
+	 */
+	public Scope reenterScope(Scope scope) {
+		return curScope = scope;
+	}
+
+	/**
+	 * Leave the innermost scope.
+	 */
+	public void leaveScope() {
+		curScope = curScope.outer;
+	}
+
+	public Scope getToplevelScope() {
+		return toplevelScope;
+	}
+
+	private final static Map<String, Integer> scopeKinds = new LinkedHashMap<String, Integer>();
+	static {
+		scopeKinds.put("Program", 0);
+		scopeKinds.put("FunctionDeclaration", 1);
+		scopeKinds.put("FunctionExpression", 1);
+		scopeKinds.put("ArrowFunctionExpression", 1);
+		scopeKinds.put("CatchClause", 2);
+		scopeKinds.put("Module", 3);
+		scopeKinds.put("BlockStatement", 4);
+		scopeKinds.put("SwitchStatement", 4);
+		scopeKinds.put("ForStatement", 5);
+		scopeKinds.put("ForInStatement", 6);
+		scopeKinds.put("ForOfStatement", 6);
+		scopeKinds.put("ComprehensionBlock", 7);
+		scopeKinds.put("LetStatement", 4);
+		scopeKinds.put("LetExpression", 4);
+		scopeKinds.put("ClassExpression", 8);
+		scopeKinds.put("NamespaceDeclaration", 9);
+		scopeKinds.put("ClassDeclaration", 10);
+		scopeKinds.put("InterfaceDeclaration", 11);
+		scopeKinds.put("TypeAliasDeclaration", 12);
+		scopeKinds.put("MappedTypeExpr", 13);
+		scopeKinds.put("EnumDeclaration", 14);
+		scopeKinds.put("ExternalModuleDeclaration", 15);
+		scopeKinds.put("ConditionalTypeExpr", 16);
+	}
+
+	/**
+	 * Get the label for a given variable in the current scope; if it cannot be found, add it
+	 * to the global scope.
+	 */
+	public Label getVarKey(String name) {
+		Label lbl = curScope.lookupVariable(name);
+		if (lbl == null) {
+			lbl = addVariable(name, toplevelScope);
+			implicitGlobals.add(name);
+		}
+		return lbl;
+	}
+
+	/**
+	 * Get the label for a given type in the current scope; or {@code null} if it
+	 * cannot be found (unlike variables, there are no implicitly global type
+	 * names).
+	 */
+	public Label getTypeKey(String name) {
+		return curScope.lookupType(name);
+	}
+
+	/**
+	 * Get the label for a given namespace in the current scope; or {@code null} if
+	 * it cannot be found (unlike variables, there are no implicitly global
+	 * namespace names).
+	 */
+	public Label getNamespaceKey(String name) {
+		return curScope.lookupNamespace(name);
+	}
+
+	/**
+	 * Add a variable to a given scope.
+	 */
+	private Label addVariable(String name, Scope scope) {
+		Label key = trapWriter.globalID("var;{" + name + "};{" + scope.scopeLabel + "}");
+		scope.variableBindings.put(name, key);
+		trapWriter.addTuple("variables", key, name, scope.scopeLabel);
+		return key;
+	}
+
+	/**
+	 * Add the given list of variables to the current scope.
+	 */
+	public void addVariables(Iterable<String> names) {
+		for (String name : names)
+			addVariable(name, curScope);
+	}
+
+	/**
+	 * Convenience wrapper for {@link #addVariables(Iterable)}.
+	 */
+	public void addVariables(String... names) {
+		addVariables(Arrays.asList(names));
+	}
+
+	/**
+	 * Add a type name to a given scope.
+	 */
+	private Label addTypeName(String name, Scope scope) {
+		Label key = trapWriter.globalID("local_type_name;{" + name + "};{" + scope.scopeLabel + "}");
+		scope.typeBindings.put(name, key);
+		trapWriter.addTuple("local_type_names", key, name, scope.scopeLabel);
+		return key;
+	}
+
+	/**
+	 * Add a type name to the current scope.
+	 */
+	public Label addTypeName(String name) {
+		return addTypeName(name, curScope);
+	}
+
+	/**
+	 * Add the given list of type names to the current scope.
+	 */
+	public void addTypeNames(Iterable<String> names) {
+		for (String name : names)
+			addTypeName(name, curScope);
+	}
+
+	/**
+	 * Adds a namespace name to the given scope.
+	 */
+	private Label addNamespaceName(String name, Scope scope) {
+		Label key = trapWriter.globalID("local_namespace_name;{" + name + "};{" + scope.scopeLabel + "}");
+		scope.namespaceBindings.put(name, key);
+		trapWriter.addTuple("local_namespace_names", key, name, scope.scopeLabel);
+		return key;
+	}
+
+	/**
+	 * Add the given list of namespace names to the current scope.
+	 */
+	public void addNamespaceNames(Iterable<String> names) {
+		for (String name : names)
+			addNamespaceName(name, curScope);
+	}
+
+	/**
+	 * Add the given list of variables to the current scope, returning the key for
+	 * the last one.
+	 */
+	public void addNames(DeclaredNames names) {
+		addVariables(names.getVariableNames());
+		addTypeNames(names.getTypeNames());
+		addNamespaceNames(names.getNamespaceNames());
+	}
+
+	/**
+	 * Does the current scope declare the given variable?
+	 */
+	public boolean declaredInCurrentScope(String name) {
+		return curScope.variableBindings.containsKey(name);
+	}
+
+	/**
+	 * True if a declaration of 'name' is in scope, not counting implicit globals.
+	 */
+	public boolean isStrictlyInScope(String name) {
+		for (Scope scope = curScope; scope != null; scope = scope.outer) {
+			if (scope.variableBindings.containsKey(name) &&
+					!(scope == toplevelScope && implicitGlobals.contains(name))) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	public static class DeclKind {
+		public static final int var = 1 << 0;
+		public static final int type = 1 << 1;
+		public static final int namespace = 1 << 2;
+
+		public static final int none = 0;
+		public static final int varAndType = var | type;
+		public static final int varAndNamespace = var | namespace;
+		public static final int all = var | type | namespace;
+
+		public static boolean isVariable(int kind) {
+			return (kind & var) != 0;
+		}
+
+		public static boolean isType(int kind) {
+			return (kind & type) != 0;
+		}
+
+		public static boolean isNamespace(int kind) {
+			return (kind & namespace) != 0;
+		}
+	}
+
+	/**
+	 * Collect all local variables, types, and namespaces declared in the given
+	 * subtree. For convenience, 'subtree' is also allowed to be an array of
+	 * subtrees, in which case all its elements are considered in turn.
+	 *
+	 * {@code isStrict} indicates whether the subtree appears in strict-mode code
+	 * (which influences the scoping of function declarations).
+	 *
+	 * If 'blockscope' is true, only block-scoped declarations are considered, and
+	 * traversal stops at block scope boundaries. Otherwise, only hoisted
+	 * declarations are considered, and traversal stops at nested functions.
+	 *
+	 * If 'declKind' is not {@link DeclKind#none}, then 'subtree' itself should be
+	 * considered to be a declaration of the kind(s) specified.
+	 */
+	public DeclaredNames collectDeclaredNames(INode subtree,
+			boolean isStrict, boolean blockscope, int declKind) {
+		return collectDeclaredNames(Collections.singletonList(subtree), isStrict, blockscope, declKind);
+	}
+
+	public DeclaredNames collectDeclaredNames(List<? extends INode> subforest,
+			final boolean isStrict, final boolean blockscope, final int declKind) {
+		final Set<String> variableNames = new LinkedHashSet<String>();
+		final Set<String> typeNames = new LinkedHashSet<String>();
+		final Set<String> namespaceNames = new LinkedHashSet<String>();
+
+		new DefaultVisitor<Void, Void>() {
+			private int declKind;
+
+			private Void visit(INode nd) {
+				return visit(nd, DeclKind.none);
+			}
+
+			private Void visit(List<? extends INode> nds) {
+				return rec(nds, DeclKind.none);
+			}
+
+			private Void visit(INode nd, int declKind) {
+				if (nd != null) {
+					int oldDeclKind = this.declKind;
+					this.declKind = declKind;
+					nd.accept(this, null);
+					this.declKind = oldDeclKind;
+				}
+				return null;
+			}
+
+			private Void rec(List<? extends INode> nds, int declKind) {
+				if (nds != null)
+					for (INode nd : nds)
+						visit(nd, declKind);
+				return null;
+			}
+
+			// this is where we actually process declarations
+			@Override
+			public Void visit(Identifier nd, Void v) {
+				if (DeclKind.isVariable(declKind))
+					variableNames.add(nd.getName());
+				if (DeclKind.isType(declKind))
+					typeNames.add(nd.getName());
+				if (DeclKind.isNamespace(declKind))
+					namespaceNames.add(nd.getName());
+				return null;
+			}
+
+			// cases where we turn on the 'declKind' flags
+			@Override
+			public Void visit(FunctionDeclaration nd, Void v) {
+				if (nd.hasDeclareKeyword())
+					return null;
+				// strict mode functions are block-scoped, non-strict mode ones aren't
+				if (blockscope == isStrict)
+					visit(nd.getId(), DeclKind.var);
+				return null;
+			}
+
+			@Override
+			public Void visit(ClassDeclaration nd, Void c) {
+				if (nd.hasDeclareKeyword())
+					return null;
+				if (blockscope)
+					visit(nd.getClassDef().getId(), DeclKind.varAndType);
+				return null;
+			}
+
+			@Override
+			public Void visit(VariableDeclarator nd, Void v) {
+				return visit(nd.getId(), DeclKind.var);
+			}
+
+			@Override
+			public Void visit(InterfaceDeclaration nd, Void c) {
+				if (blockscope)
+					visit(nd.getName(), DeclKind.type);
+				return null;
+			}
+
+			// cases where we stop traversal for block scoping
+			@Override
+			public Void visit(BlockStatement nd, Void v) {
+				if (!blockscope)
+					visit(nd.getBody());
+				return null;
+			}
+
+			@Override
+			public Void visit(SwitchStatement nd, Void v) {
+				if (!blockscope)
+					visit(nd.getCases());
+				return null;
+			}
+
+			@Override
+			public Void visit(ForStatement nd, Void v) {
+				if (!blockscope) {
+					visit(nd.getInit());
+					visit(nd.getBody());
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(EnhancedForStatement nd, Void v) {
+				if (!blockscope) {
+					visit(nd.getLeft());
+					visit(nd.getBody());
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(VariableDeclaration nd, Void v) {
+				if (nd.hasDeclareKeyword())
+					return null;
+				// in block scoping mode, only process 'let'; in non-block scoping
+				// mode, only process non-'let'
+				if (blockscope == nd.isBlockScoped(ecmaVersion))
+					visit(nd.getDeclarations());
+				return null;
+			}
+
+			@Override
+			public Void visit(LetExpression nd, Void v) {
+				if (blockscope)
+					visit(nd.getHead());
+				return null;
+			}
+
+			@Override
+			public Void visit(LetStatement nd, Void v) {
+				if (blockscope)
+					visit(nd.getHead());
+				return null;
+			}
+
+			@Override
+			public Void visit(Property nd, Void v) {
+				// properties only give rise to declarations if they are part of an object pattern
+				if (DeclKind.isVariable(declKind))
+					visit(nd.getValue(), DeclKind.var);
+				return null;
+			}
+
+			@Override
+			public Void visit(ClassBody nd, Void c) {
+				if (!blockscope)
+					visit(nd.getBody());
+				return null;
+			}
+
+			@Override
+			public Void visit(NamespaceDeclaration nd, Void c) {
+				if (blockscope)
+					return null;
+				boolean hasVariable = nd.isInstantiated() && !nd.hasDeclareKeyword();
+				visit(nd.getName(), hasVariable ? DeclKind.varAndNamespace : DeclKind.namespace);
+				return null;
+			}
+
+			// straightforward recursive cases
+			@Override
+			public Void visit(ArrayPattern nd, Void v) {
+				rec(nd.getElements(), declKind);
+				return visit(nd.getRest(), declKind);
+			}
+
+			@Override
+			public Void visit(ObjectPattern nd, Void v) {
+				rec(nd.getProperties(), declKind);
+				return visit(nd.getRest(), declKind);
+			}
+
+			@Override
+			public Void visit(IfStatement nd, Void v) {
+				visit(nd.getConsequent());
+				return visit(nd.getAlternate());
+			}
+
+			@Override
+			public Void visit(LabeledStatement nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(WithStatement nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(WhileStatement nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(DoWhileStatement nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(Program nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(TryStatement nd, Void v) {
+				visit(nd.getBlock());
+				visit(nd.getHandler());
+				visit(nd.getGuardedHandlers());
+				return visit(nd.getFinalizer());
+			}
+
+			@Override
+			public Void visit(CatchClause nd, Void v) {
+				return visit(nd.getBody());
+			}
+
+			@Override
+			public Void visit(SwitchCase nd, Void v) {
+				return visit(nd.getConsequent());
+			}
+
+			@Override
+			public Void visit(ExportDefaultDeclaration nd, Void c) {
+				return visit(nd.getDeclaration());
+			}
+
+			@Override
+			public Void visit(ExportNamedDeclaration nd, Void c) {
+				return visit(nd.getDeclaration());
+			}
+
+			@Override
+			public Void visit(ImportDeclaration nd, Void c) {
+				return visit(nd.getSpecifiers());
+			}
+
+			@Override
+			public Void visit(ImportSpecifier nd, Void c) {
+				return visit(nd.getLocal(), nd instanceof ImportNamespaceSpecifier ? DeclKind.varAndNamespace : DeclKind.all);
+			}
+
+			@Override
+			public Void visit(ImportWholeDeclaration nd, Void c) {
+				return visit(nd.getLhs(), DeclKind.all);
+			}
+
+			@Override
+			public Void visit(EnumDeclaration nd, Void c) {
+				if (!blockscope)
+					return null;
+				// Enums always occupy a place in all three declaration spaces.
+				// In some contexts it is a compilation error to reference the enum name
+				// (e.g. a const enum used as namespace), but we do not need to model this
+				// in the scope analysis.
+				return visit(nd.getId(), DeclKind.all);
+			}
+
+			@Override
+			public Void visit(TypeAliasDeclaration nd, Void c) {
+				if (!blockscope)
+					return null;
+				return visit(nd.getId(), DeclKind.type);
+			}
+		}.rec(subforest, declKind);
+
+		return new DeclaredNames(variableNames, typeNames, namespaceNames);
+	}
+
+	public Set<String> collectDeclaredInferTypes(ITypeExpression expr) {
+		final Set<String> result = new LinkedHashSet<>();
+		expr.accept(new DefaultVisitor<Void, Void>() {
+			@Override
+			public Void visit(InferTypeExpr nd, Void c) {
+				// collect all the names declared by `infer R` types.
+				result.add(nd.getTypeParameter().getId().getName());
+				return null;
+			}
+
+			@Override
+			public Void visit(ConditionalTypeExpr nd, Void c) {
+				// Note: inhibit traversal into condition, since variables declared in the
+				// condition are bound to the inner conditional expression.
+				nd.getTrueType().accept(this, c);
+				nd.getFalseType().accept(this, c);
+				return null;
+			}
+
+			@Override
+			public Void visit(ArrayTypeExpr nd, Void c) {
+				return nd.getElementType().accept(this, c);
+			}
+
+			@Override
+			public Void visit(FunctionTypeExpr nd, Void c) {
+				return nd.getFunction().accept(this, c);
+			}
+
+			@Override
+			public Void visit(FunctionExpression nd, Void c) {
+				if (nd.getReturnType() != null) {
+					nd.getReturnType().accept(this, c);
+				}
+				for (ITypeExpression paramType : nd.getParameterTypes()) {
+					paramType.accept(this, c);
+				}
+				// note: `infer` types may not occur in type parameter bounds.
+				return null;
+			}
+
+			@Override
+			public Void visit(GenericTypeExpr nd, Void c) {
+				for (ITypeExpression typeArg : nd.getTypeArguments()) {
+					typeArg.accept(this, c);
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(IndexedAccessTypeExpr nd, Void c) {
+				nd.getObjectType().accept(this, null);
+				nd.getIndexType().accept(this, null);
+				return null;
+			}
+
+			@Override
+			public Void visit(InterfaceTypeExpr nd, Void c) {
+				for (MemberDefinition<?> member : nd.getBody()) {
+					member.accept(this, null);
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(IntersectionTypeExpr nd, Void c) {
+				for (ITypeExpression type : nd.getElementTypes()) {
+					type.accept(this, null);
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(IsTypeExpr nd, Void c) {
+				return nd.getRight().accept(this, c);
+			}
+
+			@Override
+			public Void visit(ParenthesizedTypeExpr nd, Void c) {
+				return nd.getElementType().accept(this, c);
+			}
+
+			@Override
+			public Void visit(TupleTypeExpr nd, Void c) {
+				for (ITypeExpression type : nd.getElementTypes()) {
+					type.accept(this, null);
+				}
+				return null;
+			}
+
+			@Override
+			public Void visit(UnionTypeExpr nd, Void c) {
+				for (ITypeExpression type : nd.getElementTypes()) {
+					type.accept(this, null);
+				}
+				return null;
+			}
+		}, null);
+		return result;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/ScriptExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/ScriptExtractor.java
new file mode 100644
index 00000000000..d526a8fae2d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/ScriptExtractor.java
@@ -0,0 +1,75 @@
+package com.semmle.js.extractor;
+
+import com.semmle.js.extractor.ExtractorConfig.Platform;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.parser.ParseError;
+import com.semmle.util.data.Pair;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extract a stand-alone JavaScript script.
+ */
+public class ScriptExtractor implements IExtractor {
+	private ExtractorConfig config;
+
+	public ScriptExtractor(ExtractorConfig config) {
+		this.config = config;
+	}
+
+	/**
+	 * True if files with the given extension should always be treated as modules.
+	 */
+	private boolean isAlwaysModule(String extension) {
+		return extension.equals(".mjs") || extension.equals(".es6") || extension.equals(".es");
+	}
+
+	@Override
+	public LoCInfo extract(TextualExtractor textualExtractor) {
+		LocationManager locationManager = textualExtractor.getLocationManager();
+		String source = textualExtractor.getSource();
+		String shebangLine = null, shebangLineTerm = null;
+
+		if (source.startsWith("#!")) {
+			// at this point, it's safe to assume we're extracting Node.js code
+			// (unless we were specifically told otherwise)
+			if (config.getPlatform() != Platform.WEB)
+				config = config.withPlatform(Platform.NODE);
+
+			// skip shebang (but populate it as part of the lines relation below)
+			int eolPos = source.indexOf('\n');
+			if (eolPos > 0) {
+				shebangLine = source.substring(0, eolPos);
+				shebangLineTerm = "\n";
+				source = source.substring(eolPos+1);
+			} else {
+				shebangLine = source;
+				shebangLineTerm = "";
+				source = "";
+			}
+			locationManager.setStart(2, 1);
+		}
+
+		// Some file extensions are interpreted as modules by default.
+		if (isAlwaysModule(locationManager.getSourceFileExtension())) {
+			if (config.getSourceType() == SourceType.AUTO)
+				config = config.withSourceType(SourceType.MODULE);
+		}
+
+		ScopeManager scopeManager = new ScopeManager(textualExtractor.getTrapwriter(), config.getEcmaVersion());
+		Label toplevelLabel = null;
+		LoCInfo loc;
+		try {
+			Pair<Label, LoCInfo> res = new JSExtractor(config).extract(textualExtractor, source, 0, scopeManager);
+			toplevelLabel = res.fst();
+			loc = res.snd();
+		} catch (ParseError e) {
+			e.setPosition(locationManager.translatePosition(e.getPosition()));
+			throw e.asUserError();
+		}
+
+		if (shebangLine != null)
+			textualExtractor.extractLine(shebangLine, shebangLineTerm, 0, toplevelLabel);
+
+		return loc;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/StmtKinds.java b/javascript/extractor/src/com/semmle/js/extractor/StmtKinds.java
new file mode 100644
index 00000000000..d14132ddfd6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/StmtKinds.java
@@ -0,0 +1,85 @@
+package com.semmle.js.extractor;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.ForInStatement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.util.exception.CatastrophicError;
+
+/**
+ * Map from SpiderMonkey statement types to the numeric kinds used in the DB scheme.
+ */
+public class StmtKinds {
+	private static final Map<String, Integer> stmtKinds = new LinkedHashMap<String, Integer>();
+	static {
+		stmtKinds.put("EmptyStatement", 0);
+		stmtKinds.put("BlockStatement", 1);
+		stmtKinds.put("ExpressionStatement", 2);
+		stmtKinds.put("IfStatement", 3);
+		stmtKinds.put("LabeledStatement", 4);
+		stmtKinds.put("BreakStatement", 5);
+		stmtKinds.put("ContinueStatement", 6);
+		stmtKinds.put("WithStatement", 7);
+		stmtKinds.put("SwitchStatement", 8);
+		stmtKinds.put("ReturnStatement", 9);
+		stmtKinds.put("ThrowStatement", 10);
+		stmtKinds.put("TryStatement", 11);
+		stmtKinds.put("WhileStatement", 12);
+		stmtKinds.put("DoWhileStatement", 13);
+		stmtKinds.put("ForStatement", 14);
+		stmtKinds.put("ForInStatement", 15);
+		stmtKinds.put("DebuggerStatement", 16);
+		stmtKinds.put("FunctionDeclaration", 17);
+		stmtKinds.put("SwitchCase", 19);
+		stmtKinds.put("CatchClause", 20);
+		stmtKinds.put("ForOfStatement", 21);
+		stmtKinds.put("LetStatement", 24);
+		stmtKinds.put("ForEachStatement", 25);
+		stmtKinds.put("ClassDeclaration", 26);
+		stmtKinds.put("ImportDeclaration", 27);
+		stmtKinds.put("ExportAllDeclaration", 28);
+		stmtKinds.put("ExportDefaultDeclaration", 29);
+		stmtKinds.put("ExportNamedDeclaration", 30);
+		stmtKinds.put("NamespaceDeclaration", 31);
+		stmtKinds.put("ImportWholeDeclaration", 32);
+		stmtKinds.put("ExportWholeDeclaration", 33);
+		stmtKinds.put("InterfaceDeclaration", 34);
+		stmtKinds.put("TypeAliasDeclaration", 35);
+		stmtKinds.put("EnumDeclaration", 36);
+		stmtKinds.put("ExternalModuleDeclaration", 37);
+		stmtKinds.put("ExportAsNamespaceDeclaration", 38);
+		stmtKinds.put("GlobalAugmentationDeclaration", 39);
+	}
+
+	private static final Map<String, Integer> declKinds = new LinkedHashMap<String, Integer>();
+	static {
+		declKinds.put("var", 18);
+		declKinds.put("const", 22);
+		declKinds.put("let", 23);
+	}
+
+	public static int getStmtKind(final Statement stmt) {
+		Integer kind = stmt.accept(new DefaultVisitor<Void, Integer>() {
+			@Override
+			public Integer visit(Statement nd, Void v) {
+				return stmtKinds.get(nd.getType());
+			}
+
+			@Override
+			public Integer visit(VariableDeclaration nd, Void v) {
+				return declKinds.get(nd.getKind());
+			}
+
+			@Override
+			public Integer visit(ForInStatement nd, Void c) {
+				return stmtKinds.get(nd.isEach() ? "ForEachStatement" : nd.getType());
+			}
+		}, null);
+		if (kind == null)
+			throw new CatastrophicError("Unsupported statement kind: " + stmt.getClass());
+		return kind;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/SyntacticContextManager.java b/javascript/extractor/src/com/semmle/js/extractor/SyntacticContextManager.java
new file mode 100644
index 00000000000..92a4d3157b4
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/SyntacticContextManager.java
@@ -0,0 +1,144 @@
+package com.semmle.js.extractor;
+
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+import com.semmle.js.ast.BreakStatement;
+import com.semmle.js.ast.JumpStatement;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.Loop;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * The syntactic context manager keeps track of the statement currently being
+ * extracted and its enclosing loops, switch statements and labelled statements.
+ * It can use this information to determine the targets of 'break' or 'continue'
+ * statements.
+ *
+ * The syntactic context manager maintains a context chain. Each context object
+ * on the chain represents a syntactic context within a given function or the
+ * toplevel, and has a link to its enclosing syntactic context. Context objects
+ * also maintain a reference to the statement currently being extracted, and to
+ * the function or toplevel.
+ *
+ * Furthermore, each context object has two maps, one representing 'break' targets,
+ * the other 'continue' targets. These maps associate labels <i>l</i>
+ * with the nearest enclosing statement (in the same function) that has label
+ * <i>l</i>, if any. If <i>l</i> is the empty string, it maps to the nearest enclosing loop
+ * or switch statement (but only for 'break' targets).
+ */
+public class SyntacticContextManager {
+	private static class JumpTarget {
+		private final String label;
+		private final Node node;
+		private final JumpTarget outer;
+
+		public JumpTarget(String label, Node node, JumpTarget outer) {
+			this.label = label;
+			this.node = node;
+			this.outer = outer;
+		}
+
+		public Node lookup(String label) {
+			if (this.label.equals(label))
+				return node;
+			return outer == null ? null : outer.lookup(label);
+		}
+	}
+
+	private static class Context {
+		private final Context outer;
+		private final Label containerKey;
+
+		private Statement curStatement;
+		private JumpTarget breakTargets;
+		private JumpTarget continueTargets;
+
+		public Context(Context outer, Label containerKey) {
+			this.outer = outer;
+			this.containerKey = containerKey;
+		}
+
+		public void addBreakTarget(String label, Node node) {
+			breakTargets = new JumpTarget(label, node, breakTargets);
+		}
+
+		public void addContinueTarget(String label, Node node) {
+			continueTargets = new JumpTarget(label, node, continueTargets);
+		}
+	}
+
+	private Context context = null;
+	private final Set<LabeledStatement> loopLabels = new LinkedHashSet<LabeledStatement>();
+
+	public void enterContainer(Label containerKey) {
+		context = new Context(context, containerKey);
+	}
+
+	public void leaveContainer() {
+		context = context.outer;
+	}
+
+	public Statement getCurrentStatement() {
+		return context.curStatement;
+	}
+
+	public void setCurrentStatement(Statement nd) {
+		context.curStatement = nd;
+	}
+
+	public Object getCurrentContainerKey() {
+		return context.containerKey;
+	}
+
+	public void enterSwitchStatement(SwitchStatement nd) {
+		context.addBreakTarget("", nd);
+	}
+
+	public void leaveSwitchStatement() {
+		context.breakTargets = context.breakTargets.outer;
+	}
+
+	public void enterLoopStmt(Statement nd) {
+		context.addBreakTarget("", nd);
+		context.addContinueTarget("", nd);
+	}
+
+	public void leaveLoopStmt() {
+		context.breakTargets = context.breakTargets.outer;
+		context.continueTargets = context.continueTargets.outer;
+	}
+
+	public void enterLabeledStatement(LabeledStatement nd) {
+		context.addBreakTarget(nd.getLabel().getName(), nd);
+
+		// check whether this labelled statement directly or indirectly labels a loop
+		// (and thus may be the target of a 'continue' statement)
+		Statement stmt;
+		for (stmt = nd.getBody(); stmt instanceof LabeledStatement;) {
+			stmt = ((LabeledStatement)stmt).getBody();
+		}
+		if (stmt instanceof Loop) {
+			loopLabels.add(nd);
+			context.addContinueTarget(nd.getLabel().getName(), nd);
+		}
+	}
+
+	public void leaveLabeledStatement(LabeledStatement nd) {
+		context.breakTargets = context.breakTargets.outer;
+		if (loopLabels.contains(nd))
+			context.continueTargets = context.continueTargets.outer;
+	}
+
+	public Object getTarget(JumpStatement nd) {
+		String label = nd.hasLabel() ? nd.getLabel().getName() : "";
+		if (nd instanceof BreakStatement)
+			return this.context.breakTargets == null ? null : this.context.breakTargets.lookup(label);
+		else
+			return this.context.continueTargets == null ? null : this.context.continueTargets.lookup(label);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/TextualExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/TextualExtractor.java
new file mode 100644
index 00000000000..cc919b2645f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/TextualExtractor.java
@@ -0,0 +1,141 @@
+package com.semmle.js.extractor;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extractor for populating purely textual information about a file, namely its lines and their line terminators.
+ */
+public class TextualExtractor {
+	private final static Pattern LINE_TERMINATOR = Pattern.compile("\\n|\\r\\n|\\r|\\u2028|\\u2029");
+	private final static Pattern INDENT_CHAR = Pattern.compile("((\\s)\\2*)\\S.*");
+
+	private final String source;
+	private final TrapWriter trapwriter;
+	private final LocationManager locationManager;
+	private final Label fileLabel;
+	private final boolean extractLines;
+
+	public TextualExtractor(TrapWriter trapwriter, LocationManager locationManager, String source, boolean extractLines) {
+		this.trapwriter = trapwriter;
+		this.locationManager = locationManager;
+		this.source = source;
+		this.fileLabel = locationManager.getFileLabel();
+		this.extractLines = extractLines;
+	}
+
+	public TrapWriter getTrapwriter() {
+		return trapwriter;
+	}
+
+	public LocationManager getLocationManager() {
+		return locationManager;
+	}
+
+	public String getSource() {
+		return source;
+	}
+
+	public String mkToString(SourceElement nd) {
+		return sanitiseToString(nd.getLoc().getSource());
+	}
+
+	private static final String esc = "\nn\rr\tt";
+	public static String sanitiseToString(String str) {
+		if (str.length() > 20)
+			str = str.substring(0, 7) + " ... " + str.substring(str.length()-7);
+
+		StringBuilder res = new StringBuilder();
+		for (int i=0, n=str.length(); i<n; ++i) {
+			int c = str.codePointAt(i);
+			if (c < 0x20 || c > 0x7e) {
+				int j = esc.indexOf(c);
+				if (j >= 0)
+					res.append("\\" + esc.charAt(j+1));
+				else
+					res.append("\\u" + String.format("%04x", Integer.valueOf(c)));
+			} else {
+				res.append((char)c);
+			}
+		}
+		return res.toString();
+	}
+
+	/**
+	 * Emit a lines/4 tuple, if {@link #extractLines} is {@code true},  and an
+	 * indentation/4 tuple, where applicable, for a line of source code.
+	 *
+	 * @param line the text of the line
+	 * @param term the line terminator
+	 * @param i the line number
+	 */
+	public void extractLine(String line, String term, int i, Label toplevelKey) {
+		if (extractLines) {
+			Label key = trapwriter.freshLabel();
+			trapwriter.addTuple("lines", key, toplevelKey, line, term);
+			locationManager.emitSnippetLocation(key, i, 1, i, line.length());
+		}
+
+		Matcher indentCharMatcher = INDENT_CHAR.matcher(line);
+		if (indentCharMatcher.matches()) {
+			// translate logical line number `i` into actual line number within file
+			int lineno = locationManager.translatePosition(new Position(i, 1, 0)).getLine();
+			String indentChar = indentCharMatcher.group(2);
+			int indentDepth = indentCharMatcher.group(1).length();
+			trapwriter.addTuple("indentation", fileLabel, lineno, indentChar, indentDepth);
+		}
+	}
+
+	/**
+	 * Extract lexical information about source lines and line numbers.
+	 */
+	public Position extractLines(String src, Label toplevelKey) {
+		int len = src.length(), i = 1, start = 0, llength = 0;
+
+		Matcher matcher = LINE_TERMINATOR.matcher(src);
+		while (matcher.find()) {
+			String line = src.substring(start, matcher.start());
+			llength = line.length();
+			extractLine(line, matcher.group(), i++, toplevelKey);
+			start = matcher.end();
+		}
+
+		if (start < len) {
+			extractLine(src.substring(start), "", i, toplevelKey);
+			llength = len - start;
+		} else {
+			--i;
+		}
+
+		return new Position(i, llength, len);
+	}
+
+	public int getNumLines() {
+		Matcher matcher = LINE_TERMINATOR.matcher(source);
+		int n = 0, end = 0;
+		while (matcher.find()) {
+			++n;
+			end = matcher.end();
+		}
+		if (end < source.length())
+			++n;
+		return n;
+	}
+
+	public String getLine(int lineNumber) {
+		Matcher matcher = LINE_TERMINATOR.matcher(source);
+		int n = 1, end = 0;
+		while (matcher.find()) {
+			if (n == lineNumber)
+				return source.substring(end, matcher.end());
+			++n;
+			end = matcher.end();
+		}
+		return source.substring(end);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/TypeExprKinds.java b/javascript/extractor/src/com/semmle/js/extractor/TypeExprKinds.java
new file mode 100644
index 00000000000..2887ad3ab8e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/TypeExprKinds.java
@@ -0,0 +1,234 @@
+package com.semmle.js.extractor;
+
+import com.semmle.js.ast.DefaultVisitor;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.extractor.ASTExtractor.IdContext;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+import com.semmle.util.exception.CatastrophicError;
+
+public class TypeExprKinds {
+	private static final int simpleTypeAccess = 0;
+	private static final int typeDecl = 1;
+	private static final int keywordTypeExpr = 2;
+	private static final int stringLiteralTypeExpr = 3;
+	private static final int numberLiteralTypeExpr = 4;
+	private static final int booeleanLiteralTypeExpr = 5;
+	private static final int arrayTypeExpr = 6;
+	private static final int unionTypeExpr = 7;
+	private static final int indexedAccessTypeExpr = 8;
+	private static final int intersectionTypeExpr = 9;
+	private static final int parenthesizedTypeExpr = 10;
+	private static final int tupleTypeExpr = 11;
+	private static final int keyofTypeExpr = 12;
+	private static final int qualifiedTypeAccess = 13;
+	private static final int genericTypeExpr = 14;
+	private static final int typeLabel = 15;
+	private static final int typeofTypeExpr = 16;
+	private static final int simpleVarTypeAccess = 17;
+	private static final int qualifiedVarTypeAccess = 18;
+	private static final int thisVarTypeAccess = 19;
+	private static final int isTypeExpr = 20;
+	private static final int interfaceTypeExpr = 21;
+	private static final int typeParameter = 22;
+	private static final int plainFunctionTypeExpr = 23;
+	private static final int constructorTypeExpr = 24;
+	private static final int simpleNamespaceAccess = 25;
+	private static final int qualifiedNamespaceAccess = 26;
+	private static final int mappedTypeExpr = 27;
+	private static final int conditionalTypeExpr = 28;
+	private static final int inferTypeExpr = 29;
+	private static final int importTypeAccess = 30;
+	private static final int importNamespaceAccess = 31;
+	private static final int importVarTypeAccess = 32;
+	private static final int optionalTypeExpr = 33;
+	private static final int restTypeExpr = 34;
+
+	public static int getTypeExprKind(final INode type, final IdContext idcontext) {
+		Integer kind = type.accept(new DefaultVisitor<Void, Integer>() {
+			@Override
+			public Integer visit(Identifier nd, Void c) {
+				switch (idcontext) {
+				case typeDecl:
+					return TypeExprKinds.typeDecl;
+				case typeBind:
+					return simpleTypeAccess;
+				case varInTypeBind:
+					return simpleVarTypeAccess;
+				case namespaceBind:
+					return simpleNamespaceAccess;
+				default:
+					return typeLabel;
+				}
+			}
+
+			@Override
+			public Integer visit(KeywordTypeExpr nd, Void c) {
+				if (idcontext == IdContext.varInTypeBind && nd.getKeyword().equals("this")) {
+					return thisVarTypeAccess;
+				}
+				return keywordTypeExpr;
+			}
+
+			@Override
+			public Integer visit(ArrayTypeExpr nd, Void c) {
+				return arrayTypeExpr;
+			}
+
+			@Override
+			public Integer visit(UnionTypeExpr nd, Void c) {
+				return unionTypeExpr;
+			}
+
+			@Override
+			public Integer visit(IndexedAccessTypeExpr nd, Void c) {
+				return indexedAccessTypeExpr;
+			}
+
+			@Override
+			public Integer visit(IntersectionTypeExpr nd, Void c) {
+				return intersectionTypeExpr;
+			}
+
+			@Override
+			public Integer visit(ParenthesizedTypeExpr nd, Void c) {
+				return parenthesizedTypeExpr;
+			}
+
+			@Override
+			public Integer visit(TupleTypeExpr nd, Void c) {
+				return tupleTypeExpr;
+			}
+
+			@Override
+			public Integer visit(KeyofTypeExpr nd, Void c) {
+				return keyofTypeExpr;
+			}
+
+			@Override
+			public Integer visit(MemberExpression nd, Void c) {
+				if (idcontext == IdContext.varInTypeBind) {
+					return qualifiedVarTypeAccess;
+				} else if (idcontext == IdContext.namespaceBind) {
+					return qualifiedNamespaceAccess;
+				} else {
+					return qualifiedTypeAccess;
+				}
+			}
+
+			@Override
+			public Integer visit(GenericTypeExpr nd, Void c) {
+				return genericTypeExpr;
+			}
+
+			@Override
+			public Integer visit(TypeofTypeExpr nd, Void c) {
+				return typeofTypeExpr;
+			}
+
+			@Override
+			public Integer visit(IsTypeExpr nd, Void c) {
+				return isTypeExpr;
+			}
+
+			@Override
+			public Integer visit(InterfaceTypeExpr nd, Void c) {
+				return interfaceTypeExpr;
+			}
+
+			@Override
+			public Integer visit(Literal nd, Void c) {
+				if (nd.getValue() == null) {
+					// We represent the null type as a keyword type in QL, but in the extractor AST
+					// it is a Literal because the TypeScript AST does not distinguish those.
+					//
+					// Main reasons not to expose the null type as a literal type:
+					// - TypeScript documentation does not treat the null type as a literal type.
+					// - There is an "undefined" type, but there is no "undefined" literal.
+					return keywordTypeExpr;
+				} else if (nd.getValue() instanceof String) {
+					return stringLiteralTypeExpr;
+				} else if (nd.getValue() instanceof Number) {
+					return numberLiteralTypeExpr;
+				} else if (nd.getValue() instanceof Boolean) {
+					return booeleanLiteralTypeExpr;
+				} else {
+					throw new CatastrophicError("Unsupported literal type expression kind: " + nd.getValue().getClass());
+				}
+			}
+
+			@Override
+			public Integer visit(TypeParameter nd, Void c) {
+				return typeParameter;
+			}
+
+			@Override
+			public Integer visit(FunctionTypeExpr nd, Void c) {
+				return nd.isConstructor() ? constructorTypeExpr : plainFunctionTypeExpr;
+			}
+
+			@Override
+			public Integer visit(MappedTypeExpr nd, Void c) {
+				return mappedTypeExpr;
+			}
+
+			@Override
+			public Integer visit(ConditionalTypeExpr nd, Void c) {
+				return conditionalTypeExpr;
+			}
+
+			@Override
+			public Integer visit(InferTypeExpr nd, Void c) {
+				return inferTypeExpr;
+			}
+
+			@Override
+			public Integer visit(ImportTypeExpr nd, Void c) {
+				switch (idcontext) {
+				case namespaceBind:
+					return importNamespaceAccess;
+				case typeBind:
+					return importTypeAccess;
+				case varInTypeBind:
+					return importVarTypeAccess;
+				default:
+					return importTypeAccess;
+				}
+			}
+
+			@Override
+			public Integer visit(OptionalTypeExpr nd, Void c) {
+				return optionalTypeExpr;
+			}
+
+			@Override
+			public Integer visit(RestTypeExpr nd, Void c) {
+				return restTypeExpr;
+			}
+		}, null);
+		if (kind == null)
+			throw new CatastrophicError("Unsupported type expression kind: " + type.getClass());
+		return kind;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/TypeScriptExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/TypeScriptExtractor.java
new file mode 100644
index 00000000000..64bb63f9e69
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/TypeScriptExtractor.java
@@ -0,0 +1,35 @@
+package com.semmle.js.extractor;
+
+import java.io.File;
+
+import com.semmle.js.extractor.ExtractorConfig.ECMAVersion;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.parser.JSParser.Result;
+import com.semmle.js.parser.ParseError;
+import com.semmle.js.parser.TypeScriptParser;
+
+public class TypeScriptExtractor implements IExtractor {
+	private final JSExtractor jsExtractor;
+	private final TypeScriptParser parser;
+
+	public TypeScriptExtractor(ExtractorConfig config, TypeScriptParser parser) {
+		this.jsExtractor = new JSExtractor(config);
+		this.parser = parser;
+	}
+
+	@Override
+	public LoCInfo extract(TextualExtractor textualExtractor) {
+		LocationManager locationManager = textualExtractor.getLocationManager();
+		String source = textualExtractor.getSource();
+		File sourceFile = locationManager.getSourceFile();
+		Result res = parser.parse(sourceFile, source);
+		ScopeManager scopeManager = new ScopeManager(textualExtractor.getTrapwriter(), ECMAVersion.ECMA2017);
+		try {
+			SourceType sourceType = jsExtractor.establishSourceType(source, false);
+			return jsExtractor.extract(textualExtractor, source, 0, scopeManager, sourceType, res).snd();
+		} catch (ParseError e) {
+			e.setPosition(locationManager.translatePosition(e.getPosition()));
+			throw e.asUserError();
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/TypeScriptMode.java b/javascript/extractor/src/com/semmle/js/extractor/TypeScriptMode.java
new file mode 100644
index 00000000000..62b44a33c3c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/TypeScriptMode.java
@@ -0,0 +1,24 @@
+package com.semmle.js.extractor;
+
+/**
+ * The amount of information to extract from TypeScript files.
+ */
+public enum TypeScriptMode {
+	/**
+	 * TypeScript files will not be extracted.
+	 */
+	NONE,
+
+	/**
+	 * Only syntactic information will be extracted from TypeScript files.
+	 *
+	 * This requires Node.js and the TypeScript compiler to be installed if the
+	 * project contains any TypeScript files.
+	 */
+	BASIC,
+
+	/**
+	 * Extract as much as possible from TypeScript files.
+	 */
+	FULL;
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/YAMLExtractor.java b/javascript/extractor/src/com/semmle/js/extractor/YAMLExtractor.java
new file mode 100644
index 00000000000..dd22e5d5707
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/YAMLExtractor.java
@@ -0,0 +1,246 @@
+package com.semmle.js.extractor;
+
+import org.yaml.snakeyaml.composer.Composer;
+import org.yaml.snakeyaml.error.Mark;
+import org.yaml.snakeyaml.error.MarkedYAMLException;
+import org.yaml.snakeyaml.events.AliasEvent;
+import org.yaml.snakeyaml.events.Event;
+import org.yaml.snakeyaml.events.MappingStartEvent;
+import org.yaml.snakeyaml.events.NodeEvent;
+import org.yaml.snakeyaml.events.ScalarEvent;
+import org.yaml.snakeyaml.events.SequenceStartEvent;
+import org.yaml.snakeyaml.nodes.NodeId;
+import org.yaml.snakeyaml.parser.Parser;
+import org.yaml.snakeyaml.parser.ParserImpl;
+import org.yaml.snakeyaml.reader.ReaderException;
+import org.yaml.snakeyaml.reader.StreamReader;
+import org.yaml.snakeyaml.resolver.Resolver;
+
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.exception.CatastrophicError;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+import com.semmle.util.trap.TrapWriter.Table;
+
+/**
+ * Extractor for populating YAML files.
+ *
+ * <p>
+ * The extractor uses <a href="http://www.snakeyaml.org/">SnakeYAML</a> to parse YAML.
+ * </p>
+ */
+public class YAMLExtractor implements IExtractor {
+    /** The tables constituting the YAML dbscheme. */
+    private static enum YAMLTables implements Table {
+        YAML(6),         // yaml         (id: @yaml_node, kind: int ref, parent: @yaml_node_parent ref,
+                         //               idx: int ref, tag: string ref, tostring: string ref)
+        YAML_ANCHORS(2), // yaml_anchors (node: @yaml_node ref, anchor: string ref)
+        YAML_ALIASES(2), // yaml_aliases (alias: @yaml_alias_node ref, target: string ref)
+        YAML_SCALARS(3), // yaml_scalars (scalar: @yaml_scalar_node ref, style: int ref, value: string ref)
+        YAML_ERRORS(2);  // yaml_errors  (id: @yaml_error, message: string ref)
+
+        private final int arity;
+
+        private YAMLTables(int arity) {
+            this.arity = arity;
+        }
+
+        @Override
+        public String getName() {
+            return StringUtil.lc(name());
+        }
+
+        @Override
+        public int getArity() {
+            return arity;
+        }
+
+        @Override
+        public boolean validate(Object... values) {
+            return true;
+        }
+    }
+
+    /*
+     * case @yaml_node.kind of
+     *   0 = @yaml_scalar_node
+     * | 1 = @yaml_mapping_node
+     * | 2 = @yaml_sequence_node
+     * | 3 = @yaml_alias_node
+     */
+    private static enum NodeKind { SCALAR, MAPPING, SEQUENCE, ALIAS };
+
+    private final boolean tolerateParseErrors;
+
+    private LocationManager locationManager;
+    private TrapWriter trapWriter;
+
+    /**
+     * The underlying SnakeYAML parser; we use the relatively low-level {@linkplain Parser}
+     * instead of the more high-level {@linkplain Composer}, since our dbscheme represents
+     * YAML documents in AST form, with aliases left unresolved.
+     */
+    private Parser parser;
+
+    /** The resolver used for resolving type tags. */
+    private Resolver resolver;
+
+    public YAMLExtractor(ExtractorConfig config) {
+        this.tolerateParseErrors = config.isTolerateParseErrors();
+    }
+
+    @Override
+    public LoCInfo extract(TextualExtractor textualExtractor) {
+        locationManager = textualExtractor.getLocationManager();
+        trapWriter = textualExtractor.getTrapwriter();
+
+        Label fileLabel = locationManager.getFileLabel();
+        try {
+            parser = new ParserImpl(new StreamReader(textualExtractor.getSource()));
+            resolver = new Resolver();
+
+            int idx = 0;
+            while (!atStreamEnd())
+                extractDocument(fileLabel, idx++);
+        } catch (MarkedYAMLException e) {
+            int line = e.getProblemMark().getLine()+1;
+            int column = e.getProblemMark().getColumn()+1;
+            if (!this.tolerateParseErrors)
+                throw new UserError(e.getProblem() + ": " + line + ":" + column);
+            Label lbl = trapWriter.freshLabel();
+            trapWriter.addTuple(YAMLTables.YAML_ERRORS, lbl, e.getProblem());
+            locationManager.emitSnippetLocation(lbl, line, column, line, column);
+        } catch (ReaderException e) {
+            if (!this.tolerateParseErrors)
+                throw new UserError(e.toString());
+            int c = e.getCodePoint();
+            String s = String.valueOf(Character.toChars(c));
+            trapWriter.addTuple(YAMLTables.YAML_ERRORS, trapWriter.freshLabel(), 
+            		"Unexpected character " + s + "(" + c + ")");
+            // unfortunately, SnakeYAML does not provide structured location information for ReaderExceptions
+        }
+
+        return new LoCInfo(0, 0);
+    }
+
+    /** Check whether the parser has encountered the end of the YAML input stream. */
+    private boolean atStreamEnd() {
+        if (parser.checkEvent(Event.ID.StreamStart))
+            parser.getEvent();
+        return parser.checkEvent(Event.ID.StreamEnd);
+    }
+
+    /** Extract a complete YAML document; cf. {@link Composer#composeDocument}. */
+    private void extractDocument(Label parent, int idx) {
+        // Drop the DOCUMENT-START event
+        parser.getEvent();
+        extractNode(parent, idx);
+        // Drop the DOCUMENT-END event
+        parser.getEvent();
+    }
+
+    /** Extract a single YAML node; cf. {@link Composer#composeNode}. */
+    private void extractNode(Label parent, int idx) {
+        Label label = trapWriter.freshLabel();
+        NodeKind kind;
+        String tag = "";
+        Event start = parser.getEvent(), end = start;
+
+        if (start.is(Event.ID.Alias)) {
+            kind = NodeKind.ALIAS;
+            trapWriter.addTuple(YAMLTables.YAML_ALIASES, label, ((AliasEvent) start).getAnchor());
+        } else {
+            String anchor = start instanceof NodeEvent ? ((NodeEvent)start).getAnchor() : null;
+            if (anchor != null)
+                trapWriter.addTuple(YAMLTables.YAML_ANCHORS, label, anchor);
+
+            if (start.is(Event.ID.Scalar)) {
+                kind = NodeKind.SCALAR;
+                ScalarEvent scalar = (ScalarEvent) start;
+                tag = getTag(scalar.getTag(), NodeId.scalar, scalar.getValue(), scalar.getImplicit().canOmitTagInPlainScalar());
+                trapWriter.addTuple(YAMLTables.YAML_SCALARS, label, (int)scalar.getStyle(), scalar.getValue());
+            } else if (start.is(Event.ID.SequenceStart)) {
+                kind = NodeKind.SEQUENCE;
+                SequenceStartEvent sequenceStart = (SequenceStartEvent) start;
+                tag = getTag(sequenceStart.getTag(), NodeId.sequence, null, sequenceStart.getImplicit());
+
+                int childIdx = 0;
+                while (!parser.checkEvent(Event.ID.SequenceEnd))
+                    extractNode(label, childIdx++);
+
+                end = parser.getEvent();
+            } else if (start.is(Event.ID.MappingStart)) {
+                kind = NodeKind.MAPPING;
+                MappingStartEvent mappingStart = (MappingStartEvent) start;
+                tag = getTag(mappingStart.getTag(), NodeId.mapping, null, mappingStart.getImplicit());
+
+                int childIdx = 1;
+                while (!parser.checkEvent(Event.ID.MappingEnd)) {
+                    extractNode(label, childIdx);
+                    extractNode(label, -childIdx);
+                    ++childIdx;
+                }
+
+                end = parser.getEvent();
+            } else {
+                throw new CatastrophicError("Unexpected YAML parser event: " + start);
+            }
+        }
+
+        trapWriter.addTuple(YAMLTables.YAML, label, kind.ordinal(), parent, idx, tag, mkToString(start.getStartMark(), end.getEndMark()));
+        extractLocation(label, start.getStartMark(), end.getEndMark());
+    }
+
+    /** Determine the type tag of a node. */
+    private String getTag(String explicitTag, NodeId kind, String value, boolean implicit) {
+        if (explicitTag == null || "!".equals(explicitTag))
+            return resolver.resolve(kind, value, implicit).getValue();
+        return explicitTag;
+    }
+
+    /**
+     * SnakeYAML doesn't directly expose the source text of nodes, but we can get a decent approximation
+     * from the snippet associated with the node's start {@linkplain Mark}.
+     *
+     * <p>
+     * The snippet of a {@linkplain Mark} is meant to be used for diagnostic messages and consists of
+     * two lines: the first line contains some context around the source position represented by the mark,
+     * the second line contains a caret character positioned underneath the source position itself.
+     * </p>
+     *
+     * <p>
+     * To approximate the source text, we take the text on the first line and strip off the first <i>n</i>
+     * characters, where <i>n</i> is the number of spaces preceding the caret character on the second line.
+     * </p>
+     *
+     * <p>
+     * This is only an approximation, since the context never extends across newlines, but it suffices
+     * for the purposes of <code>toString</code>.
+     * </p>
+     */
+    private String mkToString(Mark startMark, Mark endMark) {
+        String snippet = startMark.get_snippet(0, Integer.MAX_VALUE);
+        int nl = snippet.indexOf('\n');
+        String context = snippet.substring(0, nl);
+        String src = context.substring(snippet.substring(nl+1).indexOf('^'));
+        if (endMark.getLine() == startMark.getLine())
+            src = src.substring(0, endMark.getColumn()-startMark.getColumn());
+        return TextualExtractor.sanitiseToString(src);
+    }
+
+    /** Emit a source location for a YAML node. */
+    private void extractLocation(Label label, Mark startMark, Mark endMark) {
+        int startLine, startColumn, endLine, endColumn;
+
+        // SnakeYAML uses 0-based indexing for both lines and columns, so need to +1
+        startLine = startMark.getLine()+1;
+        startColumn = startMark.getColumn()+1;
+
+        // SnakeYAML's end positions are exclusive, so only need to +1 for the line
+        endLine = endMark.getLine()+1;
+        endColumn = endMark.getColumn();
+
+        locationManager.emitSnippetLocation(label, startLine, startColumn, endLine, endColumn);
+    }
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/ASTMatchingTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/ASTMatchingTests.java
new file mode 100644
index 00000000000..f57de79ff60
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/ASTMatchingTests.java
@@ -0,0 +1,93 @@
+package com.semmle.js.extractor.test;
+
+import java.io.File;
+import java.util.Iterator;
+import java.util.Map.Entry;
+
+import org.junit.Assert;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
+import com.semmle.jcorn.ESNextParser;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.SyntaxError;
+import com.semmle.js.ast.AST2JSON;
+import com.semmle.js.ast.Program;
+import com.semmle.util.io.WholeIO;
+
+/**
+ * Base class for tests that use Acorn-like AST templates to specify
+ * expected test output.
+ */
+public abstract class ASTMatchingTests {
+	/**
+	 * Assert that the given actual sub-AST matches the expected AST template, where
+	 * {@code path} is the path from the root to the sub-AST.
+	 */
+	protected void assertMatch(String path, JsonElement expected, JsonElement actual) {
+		if (expected == null)
+			Assert.assertNull(path + ": null != " + actual, actual);
+	
+		if (expected instanceof JsonPrimitive || expected instanceof JsonNull)
+			Assert.assertEquals(path, expected.toString(), actual.toString());
+	
+		if (expected instanceof JsonArray) {
+			Assert.assertTrue(path + ": " + expected + " != " + actual, actual instanceof JsonArray);
+			Iterator<JsonElement> expectedElements = ((JsonArray) expected).iterator();
+			Iterator<JsonElement> actualElements = ((JsonArray) actual).iterator();
+			int elt = 0;
+			while (expectedElements.hasNext()) {
+				String newPath = path + "[" + elt++ + "]";
+				Assert.assertTrue(newPath + ": missing", actualElements.hasNext());
+				assertMatch(newPath, expectedElements.next(), actualElements.next());
+			}
+		}
+	
+		if (expected instanceof JsonObject) {
+			Assert.assertTrue(path + ": " + expected + " != " + actual, actual instanceof JsonObject);
+			JsonObject actualObject = (JsonObject) actual;
+			for (Entry<String,JsonElement> expectedProp : ((JsonObject) expected).entrySet()) {
+				String key = expectedProp.getKey();
+				JsonElement value = expectedProp.getValue();
+				String newPath = path + "." + key;
+				Assert.assertTrue(newPath + ": missing", actualObject.has(key));
+				assertMatch(newPath, value, actualObject.get(key));
+			}
+		}
+	}
+
+	private static final File BABYLON_BASE = new File("parser-tests/babylon").getAbsoluteFile();
+
+	protected void babylonTest(String dir) {
+		babylonTest(dir, new Options().esnext(true));
+	}
+
+	protected void babylonTest(String dir, Options options) {
+		File actual = new File(new File(BABYLON_BASE, dir), "actual.js");
+		String actualSrc = new WholeIO().strictread(actual);
+		JsonElement actualJSON;
+		try {
+			Program actualAST = new ESNextParser(options, actualSrc, 0).parse();
+			actualJSON = AST2JSON.convert(actualAST);
+		} catch (SyntaxError e) {
+			actualJSON = new JsonPrimitive(e.getMessage());
+		}
+
+		File expected = new File(actual.getParentFile(), "expected.ast");
+		JsonElement expectedJSON;
+		if (expected.exists()) {
+			String expectedSrc = new WholeIO().strictread(expected);
+			expectedJSON = new JsonParser().parse(expectedSrc).getAsJsonObject();
+		} else {
+			File expectedErrFile = new File(actual.getParentFile(), "expected.error");
+			String expectedErrMsg = new WholeIO().strictread(expectedErrFile).trim();
+			expectedJSON = new JsonPrimitive(expectedErrMsg);
+		}
+
+		assertMatch("<root>", expectedJSON, actualJSON);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/AllTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/AllTests.java
new file mode 100644
index 00000000000..808d7a7ed30
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/AllTests.java
@@ -0,0 +1,23 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.runner.RunWith;
+import org.junit.runners.Suite;
+import org.junit.runners.Suite.SuiteClasses;
+
+@RunWith(Suite.class)
+@SuiteClasses({
+	JSXTests.class,
+	NodeJSDetectorTests.class,
+	TrapTests.class,
+	ObjectRestSpreadTests.class,
+	ClassPropertiesTests.class,
+	FunctionSentTests.class,
+	DecoratorTests.class,
+	ExportExtensionsTests.class,
+	AutoBuildTests.class,
+	RobustnessTests.class,
+	NumericSeparatorTests.class
+})
+public class AllTests {
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/AutoBuildTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/AutoBuildTests.java
new file mode 100644
index 00000000000..89d9494b404
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/AutoBuildTests.java
@@ -0,0 +1,428 @@
+package com.semmle.js.extractor.test;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.attribute.DosFileAttributeView;
+import java.util.ArrayList;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.Before;
+import org.junit.Test;
+
+import com.semmle.js.extractor.AutoBuild;
+import com.semmle.js.extractor.FileExtractor;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.files.FileUtil8;
+import com.semmle.util.process.Env;
+
+public class AutoBuildTests {
+	private Path SEMMLE_DIST, LGTM_SRC;
+	private Set<String> expected;
+	private Map<String, String> envVars;
+
+	/**
+	 * Set up fake distribution and source directory and environment variables pointing
+	 * to them, and add in a few fake externs.
+	 */
+	@Before
+	public void setup() throws IOException {
+		expected = new LinkedHashSet<>();
+		envVars = new LinkedHashMap<>();
+		// set up an empty distribution directory with an empty sub-directory for externs
+		SEMMLE_DIST = Files.createTempDirectory("autobuild-dist").toRealPath();
+		Path externs = Files.createDirectories(Paths.get(SEMMLE_DIST.toString(), "tools", "data", "externs"));
+
+		// set up environment variables (the value of TRAP_FOLDER and SOURCE_ARCHIVE doesn't
+		// really matter, since we won't do any actual extraction)
+		envVars.put(Env.Var.SEMMLE_DIST.toString(), SEMMLE_DIST.toString());
+		envVars.put(Env.Var.TRAP_FOLDER.toString(), SEMMLE_DIST.toString());
+		envVars.put(Env.Var.SOURCE_ARCHIVE.toString(), SEMMLE_DIST.toString());
+
+		// set up an empty source directory
+		LGTM_SRC = Files.createTempDirectory("autobuild-src").toRealPath();
+		envVars.put("LGTM_SRC", LGTM_SRC.toString());
+
+		// add a few fake externs
+		addFile(true, externs, "a.js");
+		addFile(false, externs, "a.html");
+		addFile(true, externs, "sub", "b.js");
+		addFile(false, externs, "sub", "b.json");
+	}
+
+	/**
+	 * Clean up distribution and source directory, and reset environment.
+	 */
+	@After
+	public void teardown() throws IOException {
+		FileUtil8.recursiveDelete(SEMMLE_DIST);
+		FileUtil8.recursiveDelete(LGTM_SRC);
+	}
+
+	/**
+	 * Add a file under {@code root} that we either do or don't expect to be extracted,
+	 * depending on the value of {@code extracted}. If the file is expected to be
+	 * extracted, its path is added to {@link #expected}.
+	 */
+	private Path addFile(boolean extracted, Path root, String... components) throws IOException {
+		Path p = Paths.get(root.toString(), components);
+		Files.createDirectories(p.getParent());
+		Path f = Files.createFile(p);
+		if (extracted)
+			expected.add(f.toString());
+		return f;
+	}
+
+	/**
+	 * Run autobuild and compare the set of actually extracted files against
+	 * {@link #expected}.
+	 */
+	private void runTest() throws IOException {
+		Env.systemEnv().pushEnvironmentContext(envVars);
+		try {
+			Set<String> actual = new LinkedHashSet<>();
+			new AutoBuild() {
+				@Override
+				protected void extract(FileExtractor extractor, Path file) {
+					actual.add(file.toString());
+				}
+
+				@Override
+				public void verifyTypeScriptInstallation() {
+				}
+			}.run();
+			String expectedString = StringUtil.glue("\n", expected.stream().sorted().toArray());
+			String actualString = StringUtil.glue("\n", actual.stream().sorted().toArray());
+			Assert.assertEquals(expectedString, actualString);
+		} finally {
+			Env.systemEnv().popEnvironmentContext();
+		}
+	}
+
+	@Test
+	public void basicTest() throws IOException {
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "tst.ts");
+		addFile(true, LGTM_SRC, "tst.html");
+		addFile(false, LGTM_SRC, "tst.json");
+		addFile(true, LGTM_SRC, "package.json");
+		addFile(true, LGTM_SRC, ".eslintrc.yml");
+		addFile(true, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void typescript() throws IOException {
+		envVars.put("LGTM_INDEX_TYPESCRIPT", "basic");
+		addFile(true, LGTM_SRC, "tst.ts");
+		addFile(true, LGTM_SRC, "tst.tsx");
+		runTest();
+	}
+
+	@Test(expected = UserError.class)
+	public void typescriptWrongConfig() throws IOException {
+		envVars.put("LGTM_INDEX_TYPESCRIPT", "true");
+		addFile(true, LGTM_SRC, "tst.ts");
+		addFile(true, LGTM_SRC, "tst.tsx");
+		runTest();
+	}
+
+	@Test
+	public void includeFile() throws IOException {
+		envVars.put("LGTM_INDEX_INCLUDE", "tst.js");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFile() throws IOException {
+		envVars.put("LGTM_INDEX_EXCLUDE", "node_modules/leftpad/index.js");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByPattern() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "exclude:**/node_modules");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByPattern2() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "exclude:*/**/node_modules");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "node_modules", "dep", "index.js");
+		addFile(false, LGTM_SRC, "node_modules", "dep", "node_modules", "depdep", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByPattern3() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "exclude:**/node_modules\n");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByPatterns() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "exclude:foo\nexclude:**/node_modules");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByName() throws IOException {
+		envVars.put("LGTM_INDEX_EXCLUDE", "node_modules");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByName2() throws IOException {
+		envVars.put("LGTM_INDEX_EXCLUDE", "node_modules\n");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeFolderByName3() throws IOException {
+		envVars.put("LGTM_INDEX_EXCLUDE", "./node_modules\n");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeByExtension() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "exclude:**/*.js");
+		addFile(false, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "tst.html");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		addFile(true, LGTM_SRC, "node_modules", "leftpad", "index.html");
+		runTest();
+	}
+
+	@Test
+	public void includeByExtension() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "include:**/*.json");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "tst.json");
+		addFile(true, LGTM_SRC, "node_modules", "leftpad", "tst.json");
+		runTest();
+	}
+
+	@Test
+	public void includeByExtensionInRootOnly() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "include:*.json");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "tst.json");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "tst.json");
+		runTest();
+	}
+
+	@Test
+	public void includeAndExclude() throws IOException {
+		envVars.put("LGTM_INDEX_FILTERS", "include:**/*.json\n"
+										+ "exclude:**/node_modules");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "tst.json");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "tst.json");
+		runTest();
+	}
+
+	@Test
+	public void excludeByClassification() throws IOException {
+		Path repositoryFolders = Files.createFile(SEMMLE_DIST.resolve("repositoryFolders.csv"));
+		List<String> csvLines = new ArrayList<>();
+		csvLines.add("classification,path");
+		csvLines.add("thirdparty," + LGTM_SRC.resolve("node_modules"));
+		csvLines.add("external," + LGTM_SRC.resolve("foo").resolve("bar").toUri());
+		csvLines.add("metadata," + LGTM_SRC.resolve(".git"));
+		Files.write(repositoryFolders, csvLines, StandardCharsets.UTF_8);
+		envVars.put("LGTM_REPOSITORY_FOLDERS_CSV", repositoryFolders.toString());
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(false, LGTM_SRC, "foo", "bar", "tst.js");
+		addFile(false, LGTM_SRC, ".git", "tst.js");
+		addFile(true, LGTM_SRC, "node_modules", "leftpad", "tst.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeIncludeNested() throws IOException {
+		envVars.put("LGTM_INDEX_INCLUDE", ".\ntest/util");
+		envVars.put("LGTM_INDEX_EXCLUDE", "test\ntest/util/test");
+		addFile(true, LGTM_SRC, "index.js");
+		addFile(false, LGTM_SRC, "test", "tst.js");
+		addFile(false, LGTM_SRC, "test", "subtest", "tst.js");
+		addFile(true, LGTM_SRC, "test", "util", "util.js");
+		addFile(false, LGTM_SRC, "test", "util", "test", "utiltst.js");
+		runTest();
+	}
+
+	@Test
+	public void includeImplicitlyExcluded() throws IOException {
+		Path repositoryFolders = Files.createFile(SEMMLE_DIST.resolve("repositoryFolders.csv"));
+		List<String> csvLines = new ArrayList<>();
+		csvLines.add("classification,path");
+		csvLines.add("thirdparty," + LGTM_SRC.resolve("node_modules"));
+		csvLines.add("external," + LGTM_SRC.resolve("foo").resolve("bar"));
+		csvLines.add("metadata," + LGTM_SRC.resolve(".git"));
+		Files.write(repositoryFolders, csvLines, StandardCharsets.UTF_8);
+		envVars.put("LGTM_REPOSITORY_FOLDERS_CSV", repositoryFolders.toString());
+		envVars.put("LGTM_INDEX_INCLUDE", ".\nfoo/bar");
+		addFile(true, LGTM_SRC, "tst.js");
+		addFile(true, LGTM_SRC, "foo", "bar", "tst.js");
+		addFile(false, LGTM_SRC, ".git", "tst.js");
+		addFile(true, LGTM_SRC, "node_modules", "leftpad", "tst.js");
+		runTest();
+	}
+
+	/**
+	 * Create a symbolic link from {@code $LGTM_SRC/link} to {@code target} and invoke
+	 * {@code runTest}. Skip running the test if the symbolic link cannot be created.
+	 */
+	private void createSymlinkAndRunTest(String link, Path target) throws IOException {
+		createSymlinkAndRunTest(Paths.get(LGTM_SRC.toString(), link), target);
+	}
+
+	/**
+	 * Create a symbolic link from {@code link} to {@code target} and invoke
+	 * {@code runTest}. Skip running the test if the symbolic link cannot be created.
+	 */
+	private void createSymlinkAndRunTest(Path linkPath, Path target)
+			throws IOException {
+		try {
+			Files.createSymbolicLink(linkPath, target);
+		} catch (UnsupportedOperationException | SecurityException | IOException  e) {
+			Assume.assumeNoException("Cannot create symlinks.", e);
+		}
+		runTest();
+	}
+
+	@Test
+	public void symlinkFile() throws IOException {
+		Path tst_js = addFile(true, LGTM_SRC, "tst.js");
+		createSymlinkAndRunTest("tst_link.js", tst_js);
+	}
+
+	@Test
+	public void symlinkDir() throws IOException {
+		Path testFolder = Files.createTempDirectory("autobuild-test").toAbsolutePath();
+		try {
+			addFile(false, testFolder, "tst.js");
+			createSymlinkAndRunTest("test", testFolder);
+		} finally {
+			FileUtil8.recursiveDelete(testFolder);
+		}
+	}
+
+	@Test
+	public void deadSymlinkFile() throws IOException {
+		Path dead = Paths.get("i", "do", "not", "exist", "tst.js");
+		Assert.assertFalse(Files.exists(dead));
+		createSymlinkAndRunTest("tst_link.js", dead);
+	}
+
+	@Test
+	public void deadSymlinkDir() throws IOException {
+		Path dead = Paths.get("i", "do", "not", "exist");
+		Assert.assertFalse(Files.exists(dead));
+		createSymlinkAndRunTest("test", dead);
+	}
+
+	@Test
+	public void excludeByClassificationSymlink() throws IOException {
+		// check for robustness in case LGTM_SRC is canonicalised but repositoryFolders.csv is not
+		Path testFolder = Files.createTempDirectory("autobuild-test").toAbsolutePath();
+		Files.createDirectories(testFolder);
+		Path repositoryFolders = Files.createFile(SEMMLE_DIST.resolve("repositoryFolders.csv"));
+		List<String> csvLines = new ArrayList<>();
+		csvLines.add("classification,path");
+		csvLines.add("external," + testFolder.resolve("src").resolve("foo"));
+		Files.write(repositoryFolders, csvLines, StandardCharsets.UTF_8);
+		envVars.put("LGTM_REPOSITORY_FOLDERS_CSV", repositoryFolders.toString());
+		addFile(false, LGTM_SRC, "foo", "tst.js");
+		createSymlinkAndRunTest(testFolder.resolve("src"), LGTM_SRC);
+		FileUtil8.recursiveDelete(testFolder);
+	}
+
+	@Test
+	public void excludeByClassificationBadPath() throws IOException {
+		// check for robustness in case there are unresolvable paths in repositoryFolders.csv
+		Path testFolder = Files.createTempDirectory("autobuild-test").toAbsolutePath();
+		Files.createDirectories(testFolder);
+		Path repositoryFolders = Files.createFile(SEMMLE_DIST.resolve("repositoryFolders.csv"));
+		List<String> csvLines = new ArrayList<>();
+		csvLines.add("classification,path");
+		csvLines.add("external,no-such-path");
+		Files.write(repositoryFolders, csvLines, StandardCharsets.UTF_8);
+		envVars.put("LGTM_REPOSITORY_FOLDERS_CSV", repositoryFolders.toString());
+		addFile(true, LGTM_SRC, "tst.js");
+		runTest();
+		FileUtil8.recursiveDelete(testFolder);
+	}
+
+	/**
+	 * Hide {@code p} on using {@link DosFileAttributeView} if available; otherwise do nothing.
+	 */
+	private void hide(Path p) throws IOException {
+		DosFileAttributeView attrs = Files.getFileAttributeView(p, DosFileAttributeView.class);
+		if (attrs != null)
+			attrs.setHidden(true);
+	}
+
+	@Test
+	public void hiddenFolders() throws IOException {
+		Path tst_js = addFile(false, LGTM_SRC, ".DS_Store", "tst.js");
+		hide(tst_js.getParent());
+		runTest();
+	}
+
+	@Test
+	public void hiddenFiles() throws IOException {
+		Path eslintrc = addFile(true, LGTM_SRC, ".eslintrc.json");
+		hide(eslintrc);
+		runTest();
+	}
+
+	@Test
+	public void noTypescriptExtraction() throws IOException {
+		envVars.put("LGTM_INDEX_TYPESCRIPT", "none");
+		addFile(false, LGTM_SRC, "tst.ts");
+		addFile(false, LGTM_SRC, "sub.js", "tst.ts");
+		addFile(false, LGTM_SRC, "tst.js.ts");
+		runTest();
+	}
+
+	@Test
+	public void includeNonExistentFile() throws IOException {
+		envVars.put("LGTM_INDEX_INCLUDE", "tst.js");
+		addFile(false, LGTM_SRC, "node_modules", "leftpad", "index.js");
+		runTest();
+	}
+
+	@Test
+	public void excludeNonExistentFile() throws IOException {
+		envVars.put("LGTM_INDEX_EXCLUDE", "node_modules/leftpad/index.js");
+		addFile(true, LGTM_SRC, "tst.js");
+		runTest();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/ClassPropertiesTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/ClassPropertiesTests.java
new file mode 100644
index 00000000000..c0fa0724866
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/ClassPropertiesTests.java
@@ -0,0 +1,46 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Test;
+
+/**
+ * Tests for parsing class properties.
+ *
+ * Most tests are automatically derived from the Babylon test suite
+ * as described in <code>parser-tests/babylon/README.md</code>.
+ */
+public class ClassPropertiesTests extends ASTMatchingTests {
+	@Test
+	public void testASIFailureComputed() {
+		babylonTest("experimental/class-properties/asi-failure-computed");
+	}
+
+	@Test
+	public void testASIFailureGenerator() {
+		babylonTest("experimental/class-properties/asi-failure-generator");
+	}
+
+	@Test
+	public void testASISuccess() {
+		babylonTest("experimental/class-properties/asi-success");
+	}
+
+	@Test
+	public void test43() {
+		babylonTest("experimental/uncategorised/43");
+	}
+
+	@Test
+	public void test44() {
+		babylonTest("experimental/uncategorised/44");
+	}
+
+	@Test
+	public void test45() {
+		babylonTest("experimental/uncategorised/45");
+	}
+
+	@Test
+	public void test46() {
+		babylonTest("experimental/uncategorised/46");
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/DecoratorTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/DecoratorTests.java
new file mode 100644
index 00000000000..3a2f741dbdd
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/DecoratorTests.java
@@ -0,0 +1,71 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Test;
+
+/**
+ * Tests for parsing decorators.
+ *
+ * Most tests are automatically derived from the Babylon test suite
+ * as described in <code>parser-tests/babylon/README.md</code>.
+ */
+public class DecoratorTests extends ASTMatchingTests {
+	@Test
+	public void test33() {
+		babylonTest("experimental/uncategorised/33");
+	}
+
+	@Test
+	public void test34() {
+		babylonTest("experimental/uncategorised/34");
+	}
+
+	@Test
+	public void test35() {
+		babylonTest("experimental/uncategorised/35");
+	}
+
+	@Test
+	public void test36() {
+		babylonTest("experimental/uncategorised/36");
+	}
+
+	@Test
+	public void test37() {
+		babylonTest("experimental/uncategorised/37");
+	}
+
+	@Test
+	public void test38() {
+		babylonTest("experimental/uncategorised/38");
+	}
+
+	@Test
+	public void test39() {
+		babylonTest("experimental/uncategorised/39");
+	}
+
+	@Test
+	public void test40() {
+		babylonTest("experimental/uncategorised/40");
+	}
+
+	@Test
+	public void test41() {
+		babylonTest("experimental/uncategorised/41");
+	}
+
+	@Test
+	public void test42() {
+		babylonTest("experimental/uncategorised/42");
+	}
+
+	@Test
+	public void test49() {
+		babylonTest("experimental/uncategorised/49");
+	}
+
+	@Test
+	public void test62() {
+		babylonTest("experimental/uncategorised/62");
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/ExportExtensionsTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/ExportExtensionsTests.java
new file mode 100644
index 00000000000..8026ccdc479
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/ExportExtensionsTests.java
@@ -0,0 +1,43 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Test;
+
+import com.semmle.jcorn.Options;
+
+/**
+ * Tests for parsing export extensions.
+ *
+ * Most tests are automatically derived from the Babylon test suite
+ * as described in <code>parser-tests/babylon/README.md</code>.
+ */
+public class ExportExtensionsTests extends ASTMatchingTests {
+	@Override
+	protected void babylonTest(String dir) {
+		babylonTest(dir, new Options().esnext(true).sourceType("module"));
+	}
+
+	@Test
+	public void test50() {
+		babylonTest("experimental/uncategorised/50");
+	}
+
+	@Test
+	public void test51() {
+		babylonTest("experimental/uncategorised/51");
+	}
+
+	@Test
+	public void test52() {
+		babylonTest("experimental/uncategorised/52");
+	}
+
+	@Test
+	public void test53() {
+		babylonTest("experimental/uncategorised/53");
+	}
+
+	@Test
+	public void test54() {
+		babylonTest("experimental/uncategorised/54");
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/FunctionSentTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/FunctionSentTests.java
new file mode 100644
index 00000000000..ba537356a3c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/FunctionSentTests.java
@@ -0,0 +1,26 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Test;
+
+/**
+ * Tests for parsing <code>function.sent</code>.
+ *
+ * Most tests are automatically derived from the Babylon test suite
+ * as described in <code>parser-tests/babylon/README.md</code>.
+ */
+public class FunctionSentTests extends ASTMatchingTests {
+	@Test
+	public void testInsideFunction() {
+		babylonTest("experimental/function-sent/inside-function");
+	}
+
+	@Test
+	public void testInsideGenerator() {
+		babylonTest("experimental/function-sent/inside-generator");
+	}
+
+	@Test
+	public void testInvalidProperty() {
+		babylonTest("experimental/function-sent/invalid-property");
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/JSXTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/JSXTests.java
new file mode 100644
index 00000000000..ca671de001d
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/JSXTests.java
@@ -0,0 +1,95 @@
+package com.semmle.js.extractor.test;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.semmle.jcorn.SyntaxError;
+import com.semmle.jcorn.jsx.JSXOptions;
+import com.semmle.jcorn.jsx.JSXParser;
+import com.semmle.js.ast.AST2JSON;
+import com.semmle.js.ast.Program;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.io.WholeIO;
+
+/**
+ * Tests for the JSX parser, automatically generated from the acorn-jsx test suite
+ * as described in <code>parser-tests/jcorn-jsx/README.md</code>.
+ */
+@RunWith(Parameterized.class)
+public class JSXTests extends ASTMatchingTests {
+	private static final File BASE = new File("parser-tests/jcorn-jsx").getAbsoluteFile();
+
+	@Parameters(name = "{0}")
+	public static Iterable<Object[]> tests() {
+		List<Object[]> testData = new ArrayList<Object[]>();
+
+		// iterate over all tests
+		for (File test : BASE.listFiles(FileUtil.extensionFilter(true, ".js"))) {
+			String testName = FileUtil.basename(test);
+
+			JSXOptions options = new JSXOptions().allowNamespacedObjects(false);
+			File optionsFile = new File(test.getParentFile(), testName + ".options.json");
+			if (optionsFile.exists()) {
+				JsonObject optionsJson = new JsonParser().parse(new WholeIO().strictread(optionsFile)).getAsJsonObject();
+				if (optionsJson.has("allowNamespacedObjects"))
+					options = options.allowNamespacedObjects(optionsJson.get("allowNamespacedObjects").getAsBoolean());
+				if (optionsJson.has("allowNamespaces"))
+					options = options.allowNamespaces(optionsJson.get("allowNamespaces").getAsBoolean());
+			}
+
+			JsonObject expectedAST;
+			File expectedASTFile = new File(test.getParentFile(), testName + ".ast");
+			if (expectedASTFile.exists())
+				expectedAST = new JsonParser().parse(new WholeIO().strictread(expectedASTFile)).getAsJsonObject();
+			else
+				expectedAST = null;
+
+			String expectedFailure;
+			File expectedFailureFile = new File(test.getParentFile(), testName + ".fail");
+			if (expectedFailureFile.exists())
+				expectedFailure = new WholeIO().strictread(expectedFailureFile).trim();
+			else
+				expectedFailure = null;
+
+			testData.add(new Object[] { testName, options, expectedAST, expectedFailure });
+		}
+
+		return testData;
+	}
+
+	private final String testName;
+	private final JSXOptions options;
+	private final JsonObject expectedAST;
+	private final String expectedFailure;
+
+	public JSXTests(String testName, JSXOptions options, JsonObject expectedAST, String expectedFailure) {
+		this.testName = testName;
+		this.options = options;
+		this.expectedAST = expectedAST;
+		this.expectedFailure = expectedFailure;
+	}
+
+	@Test
+	public void runtest() {
+		File inputFile = new File(BASE, testName + ".js");
+		String input = new WholeIO().strictread(inputFile);
+		try {
+			Program actualProgram = new JSXParser(options, input, 0).parse();
+			JsonElement actualAST = AST2JSON.convert(actualProgram);
+			assertMatch("<root>", expectedAST, actualAST);
+		} catch (SyntaxError e) {
+			Assert.assertEquals(expectedFailure, e.getMessage());
+		}
+	}
+}
+
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/NodeJSDetectorTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/NodeJSDetectorTests.java
new file mode 100644
index 00000000000..345554087b7
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/NodeJSDetectorTests.java
@@ -0,0 +1,198 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+import com.semmle.js.extractor.NodeJSDetector;
+import com.semmle.js.parser.JSParser;
+import com.semmle.js.parser.JSParser.Result;
+
+public class NodeJSDetectorTests {
+	private static final ExtractorConfig CONFIG = new ExtractorConfig(false);
+
+	private void isNodeJS(String src, boolean expected) {
+		Result res = JSParser.parse(CONFIG, SourceType.SCRIPT, src);
+		Node ast = res.getAST();
+		Assert.assertNotNull(ast);
+		Assert.assertTrue(NodeJSDetector.looksLikeNodeJS(ast) == expected);
+	}
+
+	@Test
+	public void testBareRequire() {
+		isNodeJS("require('fs');", true);
+	}
+
+	@Test
+	public void testRequireInit() {
+		isNodeJS("var fs = require('fs');", true);
+	}
+
+	@Test
+	public void testRequireInit2() {
+		isNodeJS("var foo, fs = require('fs');", true);
+	}
+
+	@Test
+	public void testDirective() {
+		isNodeJS("\"use strict\"; require('fs');", true);
+	}
+
+	@Test
+	public void testComment() {
+		isNodeJS("/** My awesome package.\n"
+			+ "* (C) me.\n"
+			+ "*/\n"
+			+ "\n"
+			+ "var isArray = require(\"isArray\");", true);
+	}
+
+	@Test
+	public void testInitialExport() {
+		isNodeJS("exports.foo = 0; console.log('Hello, world!');", true);
+	}
+
+	@Test
+	public void testInitialModuleExport() {
+		isNodeJS("module.exports.foo = 0; console.log('Hello, world!');", true);
+	}
+
+	@Test
+	public void testInitialBulkExport() {
+		isNodeJS("module.exports = {}; console.log('Hello, world!');", true);
+	}
+
+	@Test
+	public void testTrailingExport() {
+		isNodeJS("console.log('Hello, world!'); exports.foo = 0;", true);
+	}
+
+	@Test
+	public void testTrailingModuleExport() {
+		isNodeJS("console.log('Hello, world!'); module.exports.foo = 0;", true);
+	}
+
+	@Test
+	public void testTrailingBulkExport() {
+		isNodeJS("console.log('Hello, world!'); module.exports = {};", true);
+	}
+
+	@Test
+	public void testInitialNestedExport() {
+		isNodeJS("mystuff = module.exports = {}; mystuff.foo = 0;", true);
+	}
+
+	@Test
+	public void testInitialNestedExportInit() {
+		isNodeJS("var mystuff = module.exports = exports = {}; mystuff.foo = 0;", true);
+	}
+
+	@Test
+	public void testTrailingRequire() {
+		isNodeJS("console.log('Hello, world!'); var fs = require('fs');", true);
+	}
+
+	@Test
+	public void testSandwichedExport() {
+		isNodeJS("console.log('Hello'); exports.foo = 0; console.log('world!');", true);
+	}
+
+	@Test
+	public void umd() {
+		isNodeJS("(function(define) {\n"
+				+ "  define(function (require, exports, module) {\n"
+				+ "    var b = require('b');\n"
+				+ "    return function () {};\n"
+				+ "  });\n"
+				+ "}(\n"
+				+ "  typeof module === 'object' && module.exports && typeof define !== 'function' ?\n"
+				+ "  function (factory) { module.exports = factory(require, exports, module); } :\n"
+				+ "  define\n"
+				+ "));", false);
+	}
+
+	@Test
+	public void testRequirePropAccess() {
+		isNodeJS("var foo = require('./b').foo;", true);
+	}
+
+	@Test
+	public void testReExport() {
+		isNodeJS("module.exports = require('./e');", true);
+	}
+
+	@Test
+	public void testSeparateVar() {
+		isNodeJS("var fs; fs = require('fs');", true);
+	}
+
+	@Test
+	public void testLet() {
+		isNodeJS("let fs = require('fs');", true);
+	}
+
+	@Test
+	public void testSeparateLet() {
+		isNodeJS("let fs; fs = require('fs');", true);
+	}
+
+	@Test
+	public void testConst() {
+		isNodeJS("const fs = require('fs');", true);
+	}
+
+	@Test
+	public void testIife() {
+		isNodeJS(";(function() { require('fs'); })()", true);
+	}
+
+	@Test
+	public void testIife2() {
+		isNodeJS("!function() { require('fs'); }()", true);
+	}
+
+	@Test
+	public void testUMD() {
+		isNodeJS("(function(require) { require('fs'); })(myRequire);", false);
+	}
+
+	@Test
+	public void amdefine() {
+		// not currently detected
+		isNodeJS("if (typeof define !== 'function') define = require('amdefine')(module, require);", false);
+	}
+
+	@Test
+	public void requireAndReadProp() {
+		isNodeJS("var readFileSync = require('fs').readFileSync;", true);
+	}
+
+	@Test
+	public void toplevelAMDRequire() {
+		isNodeJS("require(['foo'], function(foo) { });", false);
+	}
+
+	@Test
+	public void requireInTry() {
+		isNodeJS("var fs;"
+				+ "try {"
+				+ "  fs = require('graceful-fs');"
+				+ "} catch(e) {"
+				+ "  fs = require('fs');"
+				+ "}",
+				true);
+	}
+
+	@Test
+	public void requireInIf() {
+		isNodeJS("var fs;"
+				+ "if (useGracefulFs) {"
+				+ "  fs = require('graceful-fs');"
+				+ "} else {"
+				+ "  fs = require('fs');"
+				+ "}",
+				true);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/NumericSeparatorTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/NumericSeparatorTests.java
new file mode 100644
index 00000000000..b7378a92f2a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/NumericSeparatorTests.java
@@ -0,0 +1,46 @@
+package com.semmle.js.extractor.test;
+
+import static org.junit.Assert.*;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+import com.semmle.jcorn.ESNextParser;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.SyntaxError;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.Program;
+
+public class NumericSeparatorTests {
+	private void test(String src, Integer numVal) {
+		try {
+			Program p = new ESNextParser(new Options().esnext(true), src, 0).parse();
+			assertNotNull(numVal);
+			assertEquals(1, p.getBody().size());
+			assertTrue(p.getBody().get(0) instanceof ExpressionStatement);
+			ExpressionStatement exprStmt = (ExpressionStatement)p.getBody().get(0);
+			assertTrue(exprStmt.getExpression() instanceof Literal);
+			assertEquals(numVal.longValue(), ((Literal)exprStmt.getExpression()).getValue());
+		} catch (SyntaxError e) {
+			assertNull(e.toString(), numVal);
+		}
+	}
+
+	@Test
+	public void test() {
+		test("0b_", null);
+		test("0b0_1", 0b01);
+		test("0B0_1", 0b01);
+		test("0b0_10", 0b010);
+		test("0B0_10", 0b010);
+		test("0b01_0", 0b010);
+		test("0B01_0", 0b010);
+		test("0b01_00", 0b0100);
+		test("0B01_00", 0b0100);
+		test("0b0__0", null);
+		test("0b0_", null);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/ObjectRestSpreadTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/ObjectRestSpreadTests.java
new file mode 100644
index 00000000000..bf98f528723
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/ObjectRestSpreadTests.java
@@ -0,0 +1,60 @@
+package com.semmle.js.extractor.test;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.semmle.jcorn.CustomParser;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.SyntaxError;
+
+/**
+ * Tests for parsing rest/spread properties.
+ *
+ * Most tests are automatically derived from the Babylon test suite
+ * as described in <code>parser-tests/babylon/README.md</code>.
+ */
+public class ObjectRestSpreadTests extends ASTMatchingTests {
+	private void testFail(String input, String msg) {
+		try {
+			new CustomParser(new Options().esnext(true), input, 0).parse();
+			Assert.fail("Expected syntax error, but parsing succeeded.");
+		} catch (SyntaxError e) {
+			Assert.assertEquals(msg, e.getMessage());
+		}
+	}
+
+	@Test
+	public void test9() {
+		babylonTest("experimental/uncategorised/9");
+	}
+
+	@Test
+	public void test10() {
+		babylonTest("experimental/uncategorised/10");
+	}
+
+	@Test
+	public void test11() {
+		babylonTest("experimental/uncategorised/11");
+	}
+
+	@Test
+	public void test12() {
+		babylonTest("experimental/uncategorised/12");
+	}
+
+	@Test
+	public void test13() {
+		babylonTest("experimental/uncategorised/13");
+	}
+
+	@Test
+	public void testObjectRestSpread() {
+		babylonTest("harmony/arrow-functions/object-rest-spread");
+	}
+
+	@Test
+	public void testFail() {
+		testFail("({...'hi'} = {})", "Assigning to rvalue (1:5)");
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/RobustnessTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/RobustnessTests.java
new file mode 100644
index 00000000000..791dcca4d11
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/RobustnessTests.java
@@ -0,0 +1,21 @@
+package com.semmle.js.extractor.test;
+
+import java.io.File;
+import java.nio.charset.StandardCharsets;
+
+import org.junit.Test;
+
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.Parser;
+import com.semmle.util.io.WholeIO;
+
+public class RobustnessTests {
+
+	@Test
+	public void letLookheadTest() {
+		File test = new File("parser-tests/robustness/letLookahead.js");
+		String src = new WholeIO(StandardCharsets.UTF_8.name()).strictread(test);
+		new Parser(new Options(), src, 0).parse();
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/test/TrapTests.java b/javascript/extractor/src/com/semmle/js/extractor/test/TrapTests.java
new file mode 100644
index 00000000000..af1c05bb776
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/test/TrapTests.java
@@ -0,0 +1,168 @@
+package com.semmle.js.extractor.test;
+
+import java.io.File;
+import java.io.StringWriter;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map.Entry;
+
+import org.junit.AfterClass;
+import org.junit.Assert;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
+import com.semmle.js.extractor.ExtractorState;
+import com.semmle.js.extractor.Main;
+import com.semmle.util.data.Pair;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.extraction.ExtractorOutputConfig;
+import com.semmle.util.io.WholeIO;
+import com.semmle.util.srcarchive.DummySourceArchive;
+import com.semmle.util.trap.ITrapWriterFactory;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.pathtransformers.ProjectLayoutTransformer;
+
+@RunWith(Parameterized.class)
+public class TrapTests {
+	private static final File BASE = new File("tests").getAbsoluteFile();
+
+	@Parameters(name = "{0}:{1}")
+	public static Iterable<Object[]> tests() {
+		List<Object[]> testData = new ArrayList<Object[]>();
+
+		// iterate over all test groups
+		for (String testgroup : BASE.list()) {
+			File root = new File(BASE, testgroup);
+			if (root.isDirectory()) {
+				// check for options.json file and process it if it exists
+				List<String> options = new ArrayList<String>();
+				File optionsFile = new File(root, "options.json");
+				if (optionsFile.exists()) {
+					JsonParser p = new JsonParser();
+					JsonObject jsonOpts = p.parse(new WholeIO().strictread(optionsFile)).getAsJsonObject();
+					for (Entry<String, JsonElement> e : jsonOpts.entrySet()) {
+						JsonElement v = e.getValue();
+						if (v instanceof JsonPrimitive) {
+							JsonPrimitive pv = (JsonPrimitive) v;
+							if (pv.isBoolean() && pv.getAsBoolean()) {
+								options.add("--" + e.getKey());
+							} else {
+								options.add("--" + e.getKey());
+								options.add(pv.getAsString());
+							}
+						} else {
+							Assert.assertTrue(v instanceof JsonArray);
+							JsonArray a = (JsonArray)v;
+							for (JsonElement elt : a) {
+								options.add("--" + e.getKey());
+								options.add(elt.getAsString());
+							}
+						}
+					}
+				}
+
+				File inputDir = new File(root, "input");
+				File jsconfigFile = new File(inputDir, "tsconfig.json");
+
+				if (jsconfigFile.exists()) {
+					// create a single test with all files in the group
+					testData.add(new Object[] { testgroup, "tsconfig", new ArrayList<String>(options) });
+				} else {
+					// create isolated tests for each input file in the group
+					for (String testfile : inputDir.list()) {
+						testData.add(new Object[] { testgroup, testfile, new ArrayList<String>(options) });
+					}
+				}
+			}
+		}
+
+		return testData;
+	}
+
+	private final String testgroup, testname;
+	private final List<String> options;
+	private static String userDir;
+	private static ExtractorState state;
+
+	public TrapTests(String testgroup, String testname, List<String> options) {
+		this.testgroup = testgroup;
+		this.testname = testname;
+		this.options = options;
+	}
+
+	@BeforeClass
+	public static void saveUserDir() {
+		userDir = System.getProperty("user.dir");
+	}
+
+	@BeforeClass
+	public static void setupState() {
+		state = new ExtractorState();
+	}
+
+	@AfterClass
+	public static void restoreUserDir() {
+		System.setProperty("user.dir", userDir);
+	}
+
+	@Test
+	public void runtest() {
+		state.reset();
+		File testdir = new File(BASE, testgroup);
+		File inputDir = new File(testdir, "input");
+		File inputFile = new File(inputDir, testname);
+		final File outputDir = new File(testdir, "output/trap");
+
+		System.setProperty("user.dir", inputFile.getParent());
+
+		options.add("--extract-program-text");
+		options.add("--quiet");
+		if (new File(inputDir, "tsconfig.json").exists()) {
+			// Use full extractor on entire directory.
+			options.add("--typescript-full");
+			options.add(inputDir.getAbsolutePath());
+		} else {
+			// Use basic extractor on a single file.
+			options.add("--typescript");
+			options.add(inputFile.getAbsolutePath());
+		}
+
+		final List<Pair<String, String>> expectedVsActual = new ArrayList<Pair<String, String>>();
+		Main main = new Main(new ExtractorOutputConfig(new ITrapWriterFactory() {
+			@Override
+			public TrapWriter mkTrapWriter(final File f) {
+				final StringWriter sw = new StringWriter();
+				ProjectLayoutTransformer transformer = new ProjectLayoutTransformer(new File(BASE, "project-layout"));
+				return new TrapWriter(sw, transformer) {
+					@Override
+					public void close() {
+						super.close();
+						// convert to and from UTF-8 to mimick treatment of unencodable characters
+						byte[] actual_utf8_bytes = StringUtil.stringToBytes(sw.toString());
+						String actual = new String(actual_utf8_bytes, Charset.forName("UTF-8"));
+						String expected = new WholeIO().strictreadText(new File(outputDir, f.getName() + ".trap"));
+						expectedVsActual.add(Pair.make(expected, actual));
+					}
+				};
+			}
+
+			@Override
+			public File getTrapFileFor(File f) {
+				return null;
+			}
+		}, new DummySourceArchive()), state);
+
+		main.run(options.toArray(new String[options.size()]));
+		for (Pair<String, String> p : expectedVsActual)
+			Assert.assertEquals(p.fst(), p.snd());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/trapcache/CachingTrapWriter.java b/javascript/extractor/src/com/semmle/js/extractor/trapcache/CachingTrapWriter.java
new file mode 100644
index 00000000000..650ef3685f1
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/trapcache/CachingTrapWriter.java
@@ -0,0 +1,80 @@
+package com.semmle.js.extractor.trapcache;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.files.FileUtil;
+import com.semmle.util.trap.TrapWriter;
+
+/**
+ * A trap writer for use with a trap cache.
+ *
+ * A caching trap writer mainly works with two files: a result
+ * file to which tuples should be appended, and a cache file
+ * that should be atomically overwritten with the complete list
+ * of tuples produced by this writer once it is closed.
+ * <p>
+ * To achieve the latter, the trap writer writes all tuples to
+ * a temporary file first. When the writer is closed (and extraction
+ * has succeeded), it atomically moves the temporary file over
+ * the cache file.
+ * <p>
+ * This is similar to a concurrent trap writer, but a caching
+ * trap writer ensures that the trap file is overwritten atomically.
+ * If this is impossible, the cached file will not be updated
+ * at all.
+ * <p>
+ * In summary, a {@code CachingTrapWriter} keeps track of three
+ * files:
+ * <ul>
+ * <li>a temporary file to which tuples produced by this writer are
+ *     written, referenced by field {@code tmpFile};
+ * <li>a cache file that is atomically overwritten with the contents
+ *     of the temporary file when this writer is closed, referenced by
+ *     field {@code trapFile};
+ * <li>a result file to which the contents of the temporary file are
+ *     appended when this writer is closed, referenced by field
+ *     {@code resultFile}.
+ * </ul>
+ */
+public class CachingTrapWriter extends TrapWriter {
+	private final File resultFile;
+
+	// whether extraction was successful
+	private boolean successful = true;
+
+	public CachingTrapWriter(File cacheFile, File resultFile) {
+		super(cacheFile, true);
+		this.resultFile = resultFile;
+	}
+
+	/**
+	 * Tell the writer that extraction was not successful;
+	 * the cache file and the result file will not be updated.
+	 */
+	public void discard() {
+		successful = false;
+	}
+
+	@Override
+	public void close() {
+		FileUtil.close(out);
+
+		try {
+			if (successful) {
+				// first append tuples from temporary file to result file (in case the move fails)
+				FileUtil.append(tmpFile, resultFile);
+				// then try to atomically move temporary file over cache file
+				Files.move(tmpFile.toPath(), trapFile.toPath(), StandardCopyOption.ATOMIC_MOVE);
+			}
+		} catch (IOException e) {
+			Exceptions.ignore(e, "Failed atomic moves are preferable to cache corruption.");
+		} finally {
+			// make sure to delete the temporary file in case the move failed
+			tmpFile.delete();
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/trapcache/DefaultTrapCache.java b/javascript/extractor/src/com/semmle/js/extractor/trapcache/DefaultTrapCache.java
new file mode 100644
index 00000000000..810d6a78fa9
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/trapcache/DefaultTrapCache.java
@@ -0,0 +1,159 @@
+package com.semmle.js.extractor.trapcache;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.FileExtractor.FileType;
+import com.semmle.util.data.Pair;
+import com.semmle.util.data.StringDigestor;
+import com.semmle.util.data.UnitParser;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.exception.ResourceError;
+import com.semmle.util.files.FileUtil;
+
+/**
+ * The default TRAP cache implementation.
+ */
+public class DefaultTrapCache implements ITrapCache {
+	private final File trapCache;
+
+	/**
+	 * A version identifier for the extractor whose TRAP files we are caching.
+	 *
+	 * The same source code of the same {@link FileType} extracted twice with
+	 * the same extractor version and under the same {@link ExtractorConfig}
+	 * should yield semantically equivalent sets of tuples.
+	 */
+	private final String extractorVersion;
+
+	public DefaultTrapCache(String trapCache, Long sizeBound, String extractorVersion) {
+		this.trapCache = new File(trapCache);
+		this.extractorVersion = extractorVersion;
+		try {
+			initCache(sizeBound);
+		} catch (ResourceError | SecurityException e) {
+			throw new ResourceError("Could not initialize trap cache at " + trapCache, e);
+		}
+	}
+
+	/**
+	 * Initialise the TRAP cache.
+	 *
+	 * This creates the cache directory (if it does not exist yet), and trims the
+	 * cache to fit within the size bounds specified in its <code>size.bounds</code>
+	 * file (if specified).
+	 *
+	 * To trim the cache size, the files in the cache are traversed in some
+	 * unspecified order, and their sizes are summed up; if their total size exceeds
+	 * the high water mark specified in <code>size.bounds</code>, files are deleted
+	 * to reduce the cache size to less than the low water mark.
+	 *
+	 * If any of these steps fail, we silently give up. Hence there is no guarantee
+	 * that the cache will actually be smaller than the low water mark after initialisation.
+	 */
+	private void initCache(Long sizeBound) {
+		FileUtil.mkdirs(this.trapCache);
+
+		try {
+			Long lowWaterMark, highWaterMark;
+
+			if (sizeBound != null) {
+				highWaterMark = sizeBound;
+				lowWaterMark = (long)(0.4 * highWaterMark);
+			} else {
+				Pair<Long, Long> watermarks = readCacheSizeBounds();
+				if (watermarks == null)
+					return;
+				lowWaterMark = watermarks.fst();
+				highWaterMark = watermarks.snd();
+			}
+
+			trimCacheToSize(lowWaterMark, highWaterMark);
+		} catch (IOException | SecurityException e) {
+			Exceptions.ignore(e, "Cache size management is optional.");
+		}
+	}
+
+	private void trimCacheToSize(long lo, long hi) {
+		// all `.trap.gz` files in the cache, in some unspecified order
+		File[] files = this.trapCache.listFiles(FileUtil.extensionFilter(true, ".trap.gz"));
+
+		// cumulative size of all files we have seen so far
+		long cur = 0;
+
+		// index of first file where cumulative size exceeds low water mark;
+		// set to files.length to indicate that the low water mark was not exceeded
+		int firstPastLo = files.length;
+
+		for (int i=0;i<files.length; ++i) {
+			File f = files[i];
+			cur += f.length();
+			if (firstPastLo == files.length && cur > lo)
+				firstPastLo = i;
+			if (cur > hi)
+				break;
+		}
+
+		// if the high water mark was exceeded, delete files starting at `firstPastLo`
+		if (cur > hi)
+			while (firstPastLo < files.length)
+				files[firstPastLo++].delete();
+	}
+
+	/**
+	 * Read the cache size bounds for this TRAP cache.
+	 *
+	 * <p>
+	 * Cache size bounds are specified on the first line of a file
+	 * called <code>size.bounds</code> in the cache directory (any
+	 * subsequent lines are ignored).
+	 *
+	 * <p>
+	 * Two bounds are specified, separated by a colon: the first is
+	 * a low water mark, the second a high water mark. The high water
+	 * mark may be omitted, in which case it defaults to the low water
+	 * mark. Both bounds should be specified as using file size units,
+	 * cf. {@link UnitParser#MEGABYTES}.
+	 *
+	 * @return a pair of file sizes in bytes, or {@code null} if the
+	 *         sizes could not be determined for whatever reason
+	 */
+	private Pair<Long, Long> readCacheSizeBounds() throws IOException {
+		File cacheSizeFile = new File(this.trapCache, "size.bounds");
+		if (!cacheSizeFile.canRead())
+			return null;
+		try (BufferedReader br = new BufferedReader(new FileReader(cacheSizeFile))) {
+			String firstLine = br.readLine();
+			if (firstLine == null)
+				return null;
+			String[] sizes = firstLine.split(":");
+			Long lo = sizes.length < 1 ? null : asFileSize(sizes[0]);
+			Long hi = sizes.length < 2 ? lo : asFileSize(sizes[1]);
+			if (lo == null || hi == null || hi < lo)
+				return null;
+			return Pair.make(lo, hi);
+		}
+	}
+
+	public static Long asFileSize(String s) {
+		Integer tmp = UnitParser.parseOpt(s, UnitParser.MEGABYTES);
+		if (tmp == null)
+			return null;
+		return tmp.longValue() * 1024 * 1024;
+	}
+
+	@Override
+	public File lookup(String source, ExtractorConfig config, FileType type) {
+		// compute a hash for this file based on its contents and the configuration options
+		StringDigestor digestor = new StringDigestor();
+		digestor.write(extractorVersion);
+		digestor.write(type.toString());
+		digestor.write(config);
+		digestor.write(source);
+		return new File(trapCache, digestor.getDigest() + ".trap.gz");
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/trapcache/DummyTrapCache.java b/javascript/extractor/src/com/semmle/js/extractor/trapcache/DummyTrapCache.java
new file mode 100644
index 00000000000..6e4b53c6dbf
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/trapcache/DummyTrapCache.java
@@ -0,0 +1,16 @@
+package com.semmle.js.extractor.trapcache;
+
+import java.io.File;
+
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.FileExtractor.FileType;
+
+/**
+ * A dummy TRAP cache that does not cache anything.
+ */
+public class DummyTrapCache implements ITrapCache {
+	@Override
+	public File lookup(String source, ExtractorConfig config, FileType type) {
+		return null;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/extractor/trapcache/ITrapCache.java b/javascript/extractor/src/com/semmle/js/extractor/trapcache/ITrapCache.java
new file mode 100644
index 00000000000..801c51a287b
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/extractor/trapcache/ITrapCache.java
@@ -0,0 +1,23 @@
+package com.semmle.js.extractor.trapcache;
+
+import java.io.File;
+
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.FileExtractor;
+
+/**
+ * Generic TRAP cache interface.
+ */
+public interface ITrapCache {
+	/**
+	 * Look up a file in the TRAP cache.
+	 *
+	 * @param source the content of the file
+	 * @param config the configuration options this file will be extracted with if it is not found in the cache
+	 * @param type the type of the file
+	 * @return {@literal null} if this TRAP cache does not support caching the given file; otherwise,
+	 *         a file in the TRAP cache which may either already exist (and then is guaranteed to hold
+	 *         cached information), or does not yet exist (and should be populated by the extractor)
+	 */
+	public File lookup(String source, ExtractorConfig config, FileExtractor.FileType type);
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/JSDocParser.java b/javascript/extractor/src/com/semmle/js/parser/JSDocParser.java
new file mode 100644
index 00000000000..a4fcd786758
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/JSDocParser.java
@@ -0,0 +1,126 @@
+package com.semmle.js.parser;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.mozilla.javascript.NativeArray;
+import org.mozilla.javascript.NativeObject;
+import org.mozilla.javascript.Undefined;
+
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.jsdoc.AllLiteral;
+import com.semmle.js.ast.jsdoc.ArrayType;
+import com.semmle.js.ast.jsdoc.FieldType;
+import com.semmle.js.ast.jsdoc.FunctionType;
+import com.semmle.js.ast.jsdoc.JSDocComment;
+import com.semmle.js.ast.jsdoc.JSDocTag;
+import com.semmle.js.ast.jsdoc.JSDocTypeExpression;
+import com.semmle.js.ast.jsdoc.NameExpression;
+import com.semmle.js.ast.jsdoc.NonNullableType;
+import com.semmle.js.ast.jsdoc.NullLiteral;
+import com.semmle.js.ast.jsdoc.NullableLiteral;
+import com.semmle.js.ast.jsdoc.NullableType;
+import com.semmle.js.ast.jsdoc.OptionalType;
+import com.semmle.js.ast.jsdoc.ParameterType;
+import com.semmle.js.ast.jsdoc.RecordType;
+import com.semmle.js.ast.jsdoc.RestType;
+import com.semmle.js.ast.jsdoc.TypeApplication;
+import com.semmle.js.ast.jsdoc.UndefinedLiteral;
+import com.semmle.js.ast.jsdoc.UnionType;
+import com.semmle.js.ast.jsdoc.VoidLiteral;
+import com.semmle.util.exception.Exceptions;
+
+/**
+ * A wrapper for invoking <a href="https://github.com/Constellation/doctrine">doctrine</a> through Rhino.
+ */
+public class JSDocParser extends ScriptLoader {
+	public JSDocParser() {
+		super("/doctrine.js");
+	}
+
+	/**
+	 * Parse the given string as a JSDoc comment.
+	 */
+	public JSDocComment parse(Comment comment) {
+		NativeObject doctrine = (NativeObject)readGlobal("doctrine");
+		NativeObject opts = mkObject("unwrap", true, "recoverable", true,
+				"sloppy", true, "lineNumbers", true);
+		NativeObject res = (NativeObject)callMethod(doctrine, "parse", comment.getText().substring(1), opts);
+		return decodeJSDocComment(res, comment);
+	}
+
+	private JSDocComment decodeJSDocComment(NativeObject obj, Comment comment) {
+		String description = (String)readProperty(obj, "description");
+		NativeArray tags = (NativeArray)readProperty(obj, "tags");
+		return new JSDocComment(comment, description, decodeJSDocTags(tags, comment));
+	}
+
+	private List<JSDocTag> decodeJSDocTags(NativeArray tags, Comment comment) {
+		String src = comment.getText().substring(1);
+		List<JSDocTag> result = new ArrayList<JSDocTag>(tags.size());
+		for (Object tag : tags) {
+			String title = readStringProperty(tag, "title");
+			String description = readStringProperty(tag, "description");
+			String name = readStringProperty(tag, "name");
+			int startLine = readIntProperty(tag, "startLine");
+			int startColumn = readIntProperty(tag, "startColumn");
+
+			Object type = readProperty(tag, "type");
+			JSDocTypeExpression jsdocType;
+			if (type == null || type == Undefined.instance) {
+				jsdocType = null;
+			} else {
+				JSObjectDecoder<JSDocTypeExpression> typeDecoder = new JSObjectDecoder<JSDocTypeExpression>(src, this, "com.semmle.js.ast.jsdoc", spec);
+				try {
+					jsdocType = typeDecoder.decodeObject((NativeObject)type);
+				} catch (ParseError e) {
+					Exceptions.ignore(e, "Exceptions in JSDoc should always be ignored.");
+					jsdocType = null;
+				}
+			}
+
+			NativeArray err = (NativeArray)readProperty(tag, "errors");
+			List<String> errors = new ArrayList<String>();
+			if (err != null) {
+				for (Object msg : err) {
+					errors.add(String.valueOf(msg));
+				}
+			}
+
+			int realStartLine = comment.getLoc().getStart().getLine() + startLine;
+			int realStartColumn = (startLine == 0 ? comment.getLoc().getStart().getColumn() + 3 : 0) + startColumn;
+			SourceLocation loc = new SourceLocation(src, new Position(realStartLine, realStartColumn, -1), new Position(realStartLine, realStartColumn + 1 + title.length(), -1));
+			result.add(new JSDocTag(loc, title, description, name, jsdocType, errors));
+		}
+		return result;
+	}
+
+	/**
+	 * Specification of Doctrine AST types for JSDoc type expressions.
+	 */
+	private static final Map<Class<? extends JSDocTypeExpression>, List<String>> spec = new LinkedHashMap<Class<? extends JSDocTypeExpression>, List<String>>();
+	static {
+		spec.put(AllLiteral.class, Arrays.<String>asList());
+		spec.put(ArrayType.class, Arrays.asList("elements"));
+		spec.put(FieldType.class, Arrays.asList("key", "value"));
+		spec.put(FunctionType.class, Arrays.asList("this", "new", "params", "result"));
+		spec.put(NameExpression.class, Arrays.asList("name"));
+		spec.put(NonNullableType.class, Arrays.asList("expression", "prefix"));
+		spec.put(NullableLiteral.class, Arrays.<String>asList());
+		spec.put(NullLiteral.class, Arrays.<String>asList());
+		spec.put(NullableType.class, Arrays.asList("expression", "prefix"));
+		spec.put(OptionalType.class, Arrays.asList("expression"));
+		spec.put(ParameterType.class, Arrays.asList("name", "expression"));
+		spec.put(RecordType.class, Arrays.asList("fields"));
+		spec.put(RestType.class, Arrays.asList("expression"));
+		spec.put(TypeApplication.class, Arrays.asList("expression", "applications"));
+		spec.put(UndefinedLiteral.class, Arrays.<String>asList());
+		spec.put(UnionType.class, Arrays.asList("elements"));
+		spec.put(VoidLiteral.class, Arrays.<String>asList());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/JSONParser.java b/javascript/extractor/src/com/semmle/js/parser/JSONParser.java
new file mode 100644
index 00000000000..8b5c8fcca1a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/JSONParser.java
@@ -0,0 +1,402 @@
+/*
+ * Based on org.mozilla.javascript.json.JsonParser from Rhino.
+ *
+ * Original licensing information:
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package com.semmle.js.parser;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.json.JSONArray;
+import com.semmle.js.ast.json.JSONLiteral;
+import com.semmle.js.ast.json.JSONObject;
+import com.semmle.js.ast.json.JSONValue;
+import com.semmle.util.data.Pair;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.io.WholeIO;
+
+public class JSONParser {
+	public static final Pattern JSON_LINE_ENDING = Pattern.compile("(\r\n|\n|\r)");
+
+	private int line, column;
+	private int offset;
+	private int length;
+	private String src;
+	private List<ParseError> recoverableErrors;
+
+	public Pair<JSONValue, List<ParseError>> parseValue(String json) throws ParseError {
+		line = 1;
+		column = 0;
+		offset = 0;
+		recoverableErrors = new ArrayList<ParseError>();
+
+		if (json == null)
+			raise("Input string may not be null");
+		length = json.length();
+		src = json;
+
+		JSONValue value = readValue();
+		consumeWhitespace();
+		if (offset < length)
+			raise("Expected end of input");
+
+		return Pair.make(value, recoverableErrors);
+	}
+
+	private <T> T raise(String msg) throws ParseError {
+		throw new ParseError(msg, line, column-1, offset);
+	}
+
+	private char next() throws ParseError {
+		if (offset >= length)
+			raise("Unexpected end of input");
+
+		char c = src.charAt(offset++);
+		if (c == '\r') {
+			if (offset < length && src.charAt(offset) == '\n') {
+				++column;
+			} else {
+				++line;
+				column = 0;
+			}
+		} else if (c == '\n') {
+			++line;
+			column = 0;
+		} else {
+			++column;
+		}
+		return c;
+	}
+
+	private char peek() {
+		return offset < length ? src.charAt(offset) : (char)-1;
+	}
+
+	private JSONValue readValue() throws ParseError {
+		consumeWhitespace();
+		while (offset < length) {
+			int startoff = offset;
+			Position start = getCurPos();
+			char c = next();
+			switch (c) {
+			case '{':
+				return readObject(startoff, start);
+			case '[':
+				return readArray(startoff, start);
+			case 't':
+				consume("rue");
+				return mkLiteral(startoff, start, true);
+			case 'f':
+				consume("alse");
+				return mkLiteral(startoff, start, false);
+			case '"':
+				return mkLiteral(startoff, start, readString());
+			case 'n':
+				consume("ull");
+				return mkLiteral(startoff, start, null);
+			case '1':
+			case '2':
+			case '3':
+			case '4':
+			case '5':
+			case '6':
+			case '7':
+			case '8':
+			case '9':
+			case '0':
+			case '-':
+				return mkLiteral(startoff, start, readNumber());
+			default:
+				raise("Unexpected token");
+			}
+		}
+		return raise("Unexpected token");
+	}
+
+	private Position getCurPos() {
+		return new Position(line, column, offset);
+	}
+
+	private JSONLiteral mkLiteral(int startoff, Position start, Object value) {
+		int endoff = offset;
+		Position end = getCurPos();
+		return new JSONLiteral(new SourceLocation(src.substring(startoff, endoff), start, end), value);
+	}
+
+	private JSONObject readObject(int startoff, Position start) throws ParseError {
+		List<Pair<String, JSONValue>> properties = new ArrayList<Pair<String, JSONValue>>();
+		int endoff;
+		Position end;
+
+		consumeWhitespace();
+		// handle empty object literal case early
+		out: if (peek() == '}') {
+			next();
+		} else {
+			String id;
+			JSONValue value;
+			boolean needsComma = false;
+			
+			while (offset < length) {
+				char c = next();
+				switch(c) {
+				case '}':
+					if (!needsComma) {
+						raise("Trailing commas are not allowed in JSON.");
+					}
+					break out;
+				case ',':
+					if (!needsComma) {
+						raise("Unexpected comma in object literal");
+					}
+					needsComma = false;
+					break;
+				case '"':
+					if (needsComma) {
+						raise("Missing comma in object literal");
+					}
+					id = readString();
+					consumeWhitespace();
+					consume(':');
+					value = readValue();
+
+					properties.add(Pair.make(id, value));
+
+					needsComma = true;
+					break;
+				default:
+					raise("JSON object property keys must be string literals.");
+				}
+				consumeWhitespace();
+			}
+			++column;
+			raise("Unexpected token");
+		}
+		endoff = offset;
+		end = getCurPos();
+		return new JSONObject(new SourceLocation(src.substring(startoff, endoff), start, end), properties);
+	}
+
+	private JSONArray readArray(int startoff, Position start) throws ParseError {
+		List<JSONValue> elements = new ArrayList<JSONValue>();
+		int endoff;
+		Position end;
+
+		consumeWhitespace();
+		// handle empty array literal case early
+		out: if (peek() == ']') {
+			next();
+		} else {
+			boolean needsComma = false;
+			while (offset < length) {
+				char c = peek();
+				switch(c) {
+				case ']':
+					if (!needsComma) {
+						raise("Omitted elements are not allowed in JSON.");
+					}
+					next();
+					break out;
+				case ',':
+					if (!needsComma) {
+						next();
+						raise("Omitted elements are not allowed in JSON.");
+					}
+					needsComma = false;
+					next();
+					break;
+				default:
+					if (needsComma) {
+						raise("Missing comma in array literal");
+					}
+					elements.add(readValue());
+					needsComma = true;
+				}
+				consumeWhitespace();
+			}
+			raise("Unterminated array literal");
+		}
+
+		endoff = offset;
+		end = getCurPos();
+		return new JSONArray(new SourceLocation(src.substring(startoff, endoff), start, end), elements);
+	}
+
+	private static final String ESCAPES = "\"\"\\\\//b\bn\nf\fr\rt\t";
+	private String readString() throws ParseError {
+		/*
+		 * Optimization: if the source contains no escaped characters, create the
+		 * string directly from the source text.
+		 */
+		int stringStart = offset;
+		while (offset < length) {
+			char c = next();
+			if (c <= '\u001F') {
+				raise("String contains control character");
+			} else if (c == '\\') {
+				break;
+			} else if (c == '"') {
+				return src.substring(stringStart, offset - 1);
+			}
+		}
+
+		/*
+		 * Slow case: string contains escaped characters.  Copy a maximal sequence
+		 * of unescaped characters into a temporary buffer, then an escaped
+		 * character, and repeat until the entire string is consumed.
+		 */
+		StringBuilder b = new StringBuilder();
+		while (offset < length) {
+			b.append(src, stringStart, offset - 1);
+			char c = next();
+
+			int i = ESCAPES.indexOf(c);
+			if (i >= 0) {
+				b.append(ESCAPES.charAt(i+1));
+			} else if (c == 'u') {
+				try {
+					String esc = src.substring(offset, offset+4);
+					int code = Integer.parseInt(esc, 16);
+					if (code < 0)
+						throw new NumberFormatException();
+					b.append((char) code);
+					offset += 4;
+					column += 4;
+				} catch (NumberFormatException nfe) {
+					raise("Invalid character escape");
+				} catch (IndexOutOfBoundsException ioobe) {
+					Exceptions.ignore(ioobe, "Raise semantically more meaningful exception instead.");
+					raise("Invalid character escape");
+				}
+			} else {
+				raise("Unexpected character in string literal");
+			}
+
+			stringStart = offset;
+			while (offset < length) {
+				c = next();
+				if (c <= '\u001F') {
+					raise("String contains control character");
+				} else if (c == '\\') {
+					break;
+				} else if (c == '"') {
+					b.append(src, stringStart, offset - 1);
+					return b.toString();
+				}
+			}
+		}
+		return raise("Unterminated string literal");
+	}
+
+	private static final Pattern NUMBER =
+			Pattern.compile("-?(0|[1-9][0-9]*)(\\.[0-9]+)?([eE][-+]?[0-9]+)?");
+	private Number readNumber() throws ParseError {
+		Matcher m = NUMBER.matcher(src);
+		if (m.find(offset-1)) {
+			try {
+				String matched = m.group();
+				// -1 because offset is already one past the start of the number
+				int l = matched.length() - 1;
+				Double d = Double.valueOf(matched);
+				offset += l;
+				column += l;
+				if (d.longValue() == d)
+					return d.longValue();
+				return d;
+			} catch (NumberFormatException nfe) {
+				Exceptions.ignore(nfe, "A corresponding exception is raised below.");
+			}
+		}
+		return raise("Invalid number literal");
+	}
+
+	private void consumeWhitespace() throws ParseError {
+		while (offset < length) {
+			char c = peek();
+			switch (c) {
+			case ' ':
+			case '\t':
+			case '\r':
+			case '\n':
+				next();
+				break;
+			case '/':
+				if (offset+1 < length) {
+					switch (src.charAt(offset+1)) {
+					case '*':
+						skipBlockComment();
+						continue;
+					case '/':
+						skipLineComment();
+						continue;
+					}
+				}
+			default:
+				return;
+			}
+		}
+	}
+
+	/**
+	 * Skips the line comment starting at the current position and records
+	 * a recoverable error.
+	 */
+	private void skipLineComment() throws ParseError {
+		Position pos = new Position(line, column, offset);
+		char c;
+		next();
+		next();
+		while ((c = peek()) != '\r' && c != '\n' && c != -1)
+			next();
+		recoverableErrors.add(new ParseError("Comments are not legal in JSON.", pos));
+	}
+
+	/**
+	 * Skips the block comment starting at the current position and records
+	 * a recoverable error.
+	 */
+	private void skipBlockComment() throws ParseError {
+		Position pos = new Position(line, column, offset);
+		char c;
+		next();
+		next();
+		do {
+			c = peek();
+			if (c < 0)
+				raise("Unterminated comment.");
+			next();
+			if (c == '*' && peek() == '/') {
+				next();
+				break;
+			}
+		} while(true);
+		recoverableErrors.add(new ParseError("Comments are not legal in JSON.", pos));
+	}
+
+	private void consume(char token) throws ParseError {
+		char c = next();
+		if (c != token)
+			raise("Expected " + token + " found " + c);
+	}
+
+	private void consume(String chars) throws ParseError {
+		for (int i=0; i<chars.length(); ++i)
+			consume(chars.charAt(i));
+	}
+
+	public static void main(String[] args) throws ParseError {
+		JSONParser parser = new JSONParser();
+		System.out.println(parser.parseValue(new WholeIO().strictread(new File(args[0]))).fst());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/JSObjectDecoder.java b/javascript/extractor/src/com/semmle/js/parser/JSObjectDecoder.java
new file mode 100644
index 00000000000..269127e363e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/JSObjectDecoder.java
@@ -0,0 +1,196 @@
+package com.semmle.js.parser;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.mozilla.javascript.NativeArray;
+import org.mozilla.javascript.NativeObject;
+import org.mozilla.javascript.UniqueTag;
+
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.SourceElement;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.util.exception.CatastrophicError;
+
+/**
+ * Decode SpiderMonkey AST objects into their Java equivalents.
+ *
+ * We assume that every AST node has a <code>type</code> property uniquely identifying its
+ * type, which is also the name of the corresponding Java class.
+ *
+ * For each Java class, a list of properties to read from the SpiderMonkey AST object has to be provided.
+ * It is assumed that the Java class has a single constructor which takes exactly those
+ * properties as arguments.
+ */
+public class JSObjectDecoder<T extends SourceElement> {
+	private final ScriptLoader loader;
+	private final String source;
+	private final String pkg;
+	private final Map<Class<? extends T>, List<String>> spec;
+
+	/**
+	 * Construct a new object decoder.
+	 *
+	 * @param source the source code from which the AST was parsed
+	 * @param loader the Rhino instance to use
+	 * @param pkg the package in which to look for Java classes
+	 * @param spec a mapping from Java classes to properties
+	 */
+	public JSObjectDecoder(String source, ScriptLoader loader, String pkg, Map<Class<? extends T>, List<String>> spec) {
+		this.source = source;
+		this.loader = loader;
+		this.pkg = pkg;
+		this.spec = spec;
+	}
+
+	/**
+	 * Decode a given SpiderMonkey AST object.
+	 *
+	 * Any exceptions that occur during conversion are caught and re-thrown as {@link CatastrophicError},
+	 * except for {@link ClassNotFoundException}s resulting from unsupported AST node types, which are
+	 * re-thrown as {@link ParseError}s.
+	 */
+	@SuppressWarnings("unchecked")
+	public T decodeObject(NativeObject object) throws ParseError {
+		String type = (String) loader.readProperty(object, "type");
+		try {
+			Class<? extends T> clazz = (Class<? extends T>)Class.forName(pkg + "." + type);
+			return decodeObject(object, clazz);
+		} catch (ClassNotFoundException e) {
+			throw new ParseError("Unexpected node type " + e, decodeLocation(object).getStart());
+		}
+	}
+
+	/**
+	 * Decode a given SpiderMonkey AST object as an instance of a given class.
+	 *
+	 * Any exceptions that occur during conversion are caught and re-thrown as {@link CatastrophicError},
+	 * except for {@link ClassNotFoundException}s resulting from unsupported AST node types, which are
+	 * re-thrown as {@link ParseError}s.
+	 */
+	@SuppressWarnings("unchecked")
+	public <V> V decodeObject(NativeObject object, Class<V> clazz) throws ParseError {
+		SourceLocation loc = decodeLocation(object);
+		Object[] ctorArgs = null;
+		try {
+			List<String> props = spec.get(clazz);
+			if (props == null)
+				throw new CatastrophicError("Unsupported node type " + clazz.getName());
+			ctorArgs = new Object[props.size()+1];
+			ctorArgs[0] = loc;
+			for (int i=1; i<ctorArgs.length; ++i) {
+				String argName = props.get(i-1);
+				Object arg = loader.readProperty(object, argName);
+				if (arg instanceof NativeObject) {
+					ctorArgs[i] = decodeObject((NativeObject)arg);
+				} else if (arg instanceof NativeArray) {
+					ctorArgs[i] = decodeObjects((NativeArray)arg);
+				} else if (arg == UniqueTag.NOT_FOUND) {
+					ctorArgs[i] = null;
+				} else if (arg instanceof CharSequence) {
+					// Rhino has its own funny string types; normalise
+					ctorArgs[i] = arg.toString();
+				} else {
+					ctorArgs[i] = arg;
+				}
+			}
+			return (V)clazz.getConstructors()[0].newInstance(ctorArgs);
+		} catch (InstantiationException e) {
+			throw new CatastrophicError(e);
+		} catch (IllegalAccessException e) {
+			throw new CatastrophicError(e);
+		} catch (IllegalArgumentException e) {
+			throw new CatastrophicError(e);
+		} catch (InvocationTargetException e) {
+			throw new CatastrophicError(e);
+		} catch (SecurityException e) {
+			throw new CatastrophicError(e);
+		}
+	}
+
+	/**
+	 * Decode an array of SpiderMonkey AST objects.
+	 */
+	public List<T> decodeObjects(NativeArray objects) throws ParseError {
+		List<T> result = new ArrayList<T>(objects.size());
+		for (Object object : objects) {
+			if (object == null)
+				result.add(null);
+			else
+				result.add(decodeObject((NativeObject)object));
+		}
+		return result;
+	}
+
+	/**
+	 * Decode an array of SpiderMonkey AST objects as instances of a given class.
+	 */
+	public <V> List<V> decodeObjects(Class<V> clazz, NativeArray objects) throws ParseError {
+		List<V> result = new ArrayList<V>(objects.size());
+		for (Object object : objects) {
+			if (object == null)
+				result.add(null);
+			else
+				result.add(decodeObject((NativeObject)object, clazz));
+		}
+		return result;
+	}
+
+	/**
+	 * Bound <code>x</code> between <code>lo</code> and <code>hi</code>, inclusive.
+	 */
+	private int bound(int x, int lo, int hi) {
+		if (x < lo)
+			return lo;
+		if (x > hi)
+			return hi;
+		return x;
+	}
+
+	/**
+	 * Decode a SpiderMonkey location object into a {@link SourceLocation}.
+	 */
+	public SourceLocation decodeLocation(NativeObject object) {
+		Integer startOffset, endOffset;
+		Position start, end;
+		Object loc = loader.readProperty(object, "loc");
+
+		if (loc == null) {
+			// no 'loc' property; check whether we have 'range'
+			Object range = loader.readProperty(object, "range");
+			if (range instanceof NativeArray) {
+				// good; make up a source location on line 0
+				startOffset = loader.readIntProperty(range, 0);
+				endOffset = loader.readIntProperty(range, 1);
+				start = new Position(1, startOffset, startOffset);
+				end = new Position(1, endOffset, endOffset);
+				return new SourceLocation(getSource(startOffset, endOffset), start, end);
+			}
+			return null;
+		}
+
+		startOffset = loader.readIntProperty(object, "start");
+		endOffset = loader.readIntProperty(object, "end");
+		start = decodePosition((NativeObject)loader.readProperty(loc, "start"), startOffset);
+		end = decodePosition((NativeObject)loader.readProperty(loc, "end"), endOffset);
+		return new SourceLocation(getSource(startOffset, endOffset), start, end);
+	}
+
+	/**
+	 * Extract the source code between a given start and end offset.
+	 */
+	public String getSource(Integer startOffset, Integer endOffset) {
+		if (startOffset == null || endOffset == null || startOffset > endOffset)
+			return "";
+		return source.substring(bound(startOffset, 0, source.length()), bound(endOffset, 0, source.length()));
+	}
+
+	/**
+	 * Decode a SpiderMonkey position object into a {@link SourceLocation}.
+	 */
+	private Position decodePosition(NativeObject object, int offset) {
+		return new Position(loader.readIntProperty(object, "line"), loader.readIntProperty(object, "column"), offset);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/JSParser.java b/javascript/extractor/src/com/semmle/js/parser/JSParser.java
new file mode 100644
index 00000000000..b84969138ed
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/JSParser.java
@@ -0,0 +1,79 @@
+package com.semmle.js.parser;
+
+import java.util.List;
+
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.Token;
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+
+/**
+ * Helper class for invoking the underlying JavaScript parser.
+ */
+public class JSParser {
+	/**
+	 * The result of a parse.
+	 *
+	 * If the parse was successful, {@link #ast} will be non-null.
+	 * Otherwise, {@link #errors} holds a list of parse errors encountered.
+	 */
+	public static class Result {
+		/**
+		 * The parsed source code.
+		 */
+		private final String source;
+
+		/**
+		 * The root of the parsed AST.
+		 */
+		private final Node ast;
+
+		/**
+		 * The list of parsed tokens.
+		 */
+		private final List<Token> tokens;
+
+		/**
+		 * The list of parsed comments.
+		 */
+		private final List<Comment> comments;
+
+		/**
+		 * The list of parser errors encountered while parsing.
+		 */
+		private final List<ParseError> errors;
+
+		public Result(String source, Node ast, List<Token> tokens, List<Comment> comments, List<ParseError> errors) {
+			this.source = source;
+			this.ast = ast;
+			this.tokens = tokens;
+			this.comments = comments;
+			this.errors = errors;
+		}
+
+		public Node getAST() {
+			return ast;
+		}
+
+		public String getSource() {
+			return source;
+		}
+
+		public List<Comment> getComments() {
+			return comments;
+		}
+
+		public List<Token> getTokens() {
+			return tokens;
+		}
+
+		public List<ParseError> getErrors() {
+			return errors;
+		}
+	}
+
+	public static Result parse(ExtractorConfig config, SourceType sourceType, String source) {
+		return JcornWrapper.parse(config, sourceType, source);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/JcornWrapper.java b/javascript/extractor/src/com/semmle/js/parser/JcornWrapper.java
new file mode 100644
index 00000000000..fb9bd987cdb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/JcornWrapper.java
@@ -0,0 +1,57 @@
+package com.semmle.js.parser;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.semmle.jcorn.CustomParser;
+import com.semmle.jcorn.Options;
+import com.semmle.jcorn.SyntaxError;
+import com.semmle.jcorn.jsx.JSXOptions;
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Token;
+import com.semmle.js.extractor.ExtractorConfig;
+import com.semmle.js.extractor.ExtractorConfig.ECMAVersion;
+import com.semmle.js.extractor.ExtractorConfig.SourceType;
+
+public class JcornWrapper {
+	/**
+	 * Parse source code as a program.
+	 */
+	public static JSParser.Result parse(ExtractorConfig config, SourceType sourceType, String source) {
+		ECMAVersion ecmaVersion = config.getEcmaVersion();
+		List<Comment> comments = new ArrayList<>();
+		List<Token> tokens = new ArrayList<>();
+		Options options = new Options()
+				.ecmaVersion(ecmaVersion.legacyVersion)
+				.sourceType(sourceType.toString())
+				.onComment(comments).onToken(tokens)
+				.preserveParens(true).allowReturnOutsideFunction(true);
+		if (config.isMozExtensions())
+			options.mozExtensions(true);
+		if (config.isJscript())
+			options.jscript(true);
+		if (config.isJsx())
+			options = new JSXOptions(options);
+		if (config.isEsnext())
+			options.esnext(true);
+		if (config.isV8Extensions())
+			options.v8Extensions(true);
+
+		Program program = null;
+		List<ParseError> errors = new ArrayList<>();
+		try {
+			if (config.isTolerateParseErrors())
+				options.onRecoverableError((err) -> errors.add(mkParseError(err)));
+
+			program = new CustomParser(options, source, 0).parse();
+		} catch (SyntaxError e) {
+			errors.add(mkParseError(e));
+		}
+		return new JSParser.Result(source, program, tokens, comments, errors);
+	}
+
+	private static ParseError mkParseError(SyntaxError e) {
+		return new ParseError(e.getMessage(), e.getPosition());
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/ParseError.java b/javascript/extractor/src/com/semmle/js/parser/ParseError.java
new file mode 100644
index 00000000000..d2f2d320447
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/ParseError.java
@@ -0,0 +1,52 @@
+package com.semmle.js.parser;
+
+import com.semmle.js.ast.Position;
+import com.semmle.util.exception.UserError;
+
+/**
+ * A parse error including both a message and location information.
+ */
+public class ParseError extends Throwable {
+	private static final long serialVersionUID = 1L;
+
+	private Position position;
+
+	public ParseError(String message, int line, int column, int offset) {
+		this(message, new Position(line, column, offset));
+	}
+
+	public ParseError(String message, Position pos) {
+		super(massage(message));
+		this.position = pos;
+	}
+
+	/*
+	 * Helper function to remove location information included in the parser's
+	 * parse error messages.
+	 */
+	private static String massage(String message) {
+		if (message.contains("("))
+			return message.substring(0, message.lastIndexOf('(')-1);
+		return message;
+	}
+
+	/**
+	 * Convert this parse error into a {@link UserError}.
+	 */
+	public UserError asUserError() {
+		return new UserError(getMessage() + ": " + position);
+	}
+
+	public Position getPosition() {
+		return position;
+	}
+
+	public void setPosition(Position position) {
+		this.position = position;
+	}
+
+	@Override
+	public String toString() {
+		return getMessage();
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/src/com/semmle/js/parser/ParsedProject.java b/javascript/extractor/src/com/semmle/js/parser/ParsedProject.java
new file mode 100644
index 00000000000..919c90517eb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/ParsedProject.java
@@ -0,0 +1,30 @@
+package com.semmle.js.parser;
+
+import java.io.File;
+import java.util.LinkedHashSet;
+import java.util.Set;
+
+public class ParsedProject {
+	private final File tsConfigFile;
+	private final Set<File> sourceFiles = new LinkedHashSet<>();
+
+	public ParsedProject(File tsConfigFile) {
+		this.tsConfigFile = tsConfigFile;
+	}
+
+	/** Returns the <tt>tsconfig.json</tt> file that defines this project. */
+	public File getTsConfigFile() {
+		return tsConfigFile;
+	}
+
+	/**
+	 * Absolute paths to the files included in this project.
+	 */
+	public Set<File> getSourceFiles() {
+		return sourceFiles;
+	}
+
+	public void addSourceFile(File file) {
+		sourceFiles.add(file);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/RegExpParser.java b/javascript/extractor/src/com/semmle/js/parser/RegExpParser.java
new file mode 100644
index 00000000000..2099edcbd91
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/RegExpParser.java
@@ -0,0 +1,150 @@
+package com.semmle.js.parser;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.mozilla.javascript.Function;
+import org.mozilla.javascript.NativeArray;
+import org.mozilla.javascript.NativeObject;
+import org.mozilla.javascript.ScriptableObject;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.regexp.BackReference;
+import com.semmle.js.ast.regexp.Caret;
+import com.semmle.js.ast.regexp.CharacterClass;
+import com.semmle.js.ast.regexp.CharacterClassEscape;
+import com.semmle.js.ast.regexp.CharacterClassRange;
+import com.semmle.js.ast.regexp.Constant;
+import com.semmle.js.ast.regexp.ControlEscape;
+import com.semmle.js.ast.regexp.ControlLetter;
+import com.semmle.js.ast.regexp.DecimalEscape;
+import com.semmle.js.ast.regexp.Disjunction;
+import com.semmle.js.ast.regexp.Dollar;
+import com.semmle.js.ast.regexp.Dot;
+import com.semmle.js.ast.regexp.Error;
+import com.semmle.js.ast.regexp.Group;
+import com.semmle.js.ast.regexp.HexEscapeSequence;
+import com.semmle.js.ast.regexp.IdentityEscape;
+import com.semmle.js.ast.regexp.NamedBackReference;
+import com.semmle.js.ast.regexp.NonWordBoundary;
+import com.semmle.js.ast.regexp.OctalEscape;
+import com.semmle.js.ast.regexp.Opt;
+import com.semmle.js.ast.regexp.Plus;
+import com.semmle.js.ast.regexp.Range;
+import com.semmle.js.ast.regexp.RegExpTerm;
+import com.semmle.js.ast.regexp.Sequence;
+import com.semmle.js.ast.regexp.Star;
+import com.semmle.js.ast.regexp.UnicodeEscapeSequence;
+import com.semmle.js.ast.regexp.UnicodePropertyEscape;
+import com.semmle.js.ast.regexp.WordBoundary;
+import com.semmle.js.ast.regexp.ZeroWidthNegativeLookahead;
+import com.semmle.js.ast.regexp.ZeroWidthNegativeLookbehind;
+import com.semmle.js.ast.regexp.ZeroWidthPositiveLookahead;
+import com.semmle.js.ast.regexp.ZeroWidthPositiveLookbehind;
+
+/**
+ * Wrapper for invoking esregex through Rhino.
+ */
+public class RegExpParser extends ScriptLoader {
+	/**
+	 * Specification for esregex AST types.
+	 */
+	private static final Map<Class<? extends RegExpTerm>, List<String>> spec = new LinkedHashMap<Class<? extends RegExpTerm>, List<String>>();
+	static {
+		spec.put(BackReference.class, Arrays.asList("value", "raw"));
+		spec.put(Caret.class, Collections.<String>emptyList());
+		spec.put(CharacterClass.class, Arrays.asList("elements", "inverted"));
+		spec.put(CharacterClassEscape.class, Arrays.asList("class", "raw"));
+		spec.put(CharacterClassRange.class, Arrays.asList("left", "right"));
+		spec.put(Constant.class, Arrays.asList("value"));
+		spec.put(ControlEscape.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(ControlLetter.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(DecimalEscape.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(Disjunction.class, Arrays.asList("disjuncts"));
+		spec.put(Dollar.class, Collections.<String>emptyList());
+		spec.put(Dot.class, Collections.<String>emptyList());
+		spec.put(Group.class, Arrays.asList("capture", "number", "name", "operand"));
+		spec.put(HexEscapeSequence.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(IdentityEscape.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(NamedBackReference.class, Arrays.asList("name", "raw"));
+		spec.put(NonWordBoundary.class, Collections.<String>emptyList());
+		spec.put(OctalEscape.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(Opt.class, Arrays.asList("operand", "greedy"));
+		spec.put(Plus.class, Arrays.asList("operand", "greedy"));
+		spec.put(Range.class, Arrays.asList("operand", "greedy", "lo", "hi"));
+		spec.put(Sequence.class, Arrays.asList("elements"));
+		spec.put(Star.class, Arrays.asList("operand", "greedy"));
+		spec.put(UnicodeEscapeSequence.class, Arrays.asList("value", "codepoint", "raw"));
+		spec.put(WordBoundary.class, Collections.<String>emptyList());
+		spec.put(ZeroWidthNegativeLookahead.class, Arrays.asList("operand"));
+		spec.put(ZeroWidthPositiveLookahead.class, Arrays.asList("operand"));
+		spec.put(ZeroWidthNegativeLookbehind.class, Arrays.asList("operand"));
+		spec.put(ZeroWidthPositiveLookbehind.class, Arrays.asList("operand"));
+		spec.put(UnicodePropertyEscape.class, Arrays.asList("name", "value", "raw"));
+	}
+
+	/**
+	 * Specification for esregex parse errors.
+	 */
+	private static final Map<Class<? extends Error>, List<String>> errspec = new LinkedHashMap<Class<? extends Error>, List<String>>();
+	static {
+		errspec.put(Error.class, Arrays.asList("code"));
+	}
+
+	/**
+	 * The result of a parse.
+	 */
+	public static class Result {
+		/**
+		 * The root of the parsed AST.
+		 */
+		private final RegExpTerm ast;
+
+		/**
+		 * A list of errors encountered during parsing.
+		 */
+		private final List<Error> errors;
+
+		public Result(RegExpTerm ast, List<Error> errors) {
+			this.ast = ast;
+			this.errors = errors;
+		}
+
+		public RegExpTerm getAST() {
+			return ast;
+		}
+
+		public List<Error> getErrors() {
+			return errors;
+		}
+	}
+
+	public RegExpParser() {
+		super("/regexparser.js");
+	}
+
+	/**
+	 * Parse the given string as a regular expression.
+	 */
+	public Result parse(String src) {
+		Function ctor = (Function)readGlobal("RegExpParser");
+		ScriptableObject parser = construct(ctor, src);
+		NativeObject ast = (NativeObject)callMethod(parser, "Pattern");
+		NativeArray errors = (NativeArray)readProperty(parser, "errors");
+		JSObjectDecoder<RegExpTerm> decoder = new JSObjectDecoder<RegExpTerm>(src, this, "com.semmle.js.ast.regexp", spec);
+		List<Error> errs = null;
+		RegExpTerm term = null;
+		try {
+			term = decoder.decodeObject(ast);
+			errs = new JSObjectDecoder<Error>(src, this, "com.semmle.js.ast.regexp", errspec).decodeObjects(errors);
+		} catch (ParseError e) {
+			errs = new ArrayList<Error>();
+			errs.add(new Error(new SourceLocation("", e.getPosition(), e.getPosition()), 1));
+		}
+		return new Result(term, errs);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/ScriptLoader.java b/javascript/extractor/src/com/semmle/js/parser/ScriptLoader.java
new file mode 100644
index 00000000000..f7ae305f21c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/ScriptLoader.java
@@ -0,0 +1,152 @@
+package com.semmle.js.parser;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+
+import org.mozilla.javascript.Context;
+import org.mozilla.javascript.Function;
+import org.mozilla.javascript.NativeArray;
+import org.mozilla.javascript.NativeJSON;
+import org.mozilla.javascript.NativeObject;
+import org.mozilla.javascript.ScriptableObject;
+import org.mozilla.javascript.Undefined;
+import org.mozilla.javascript.UniqueTag;
+
+import com.semmle.util.exception.CatastrophicError;
+import com.semmle.util.files.FileUtil;
+
+/**
+ * Helper class for executing JavaScript programs through Rhino and reading out values from the
+ * resulting environment.
+ */
+public class ScriptLoader {
+	private final Context cx;
+	private final ScriptableObject scope;
+	
+	public ScriptLoader(String scriptPath) {
+		InputStreamReader inputStreamReader = null;
+
+		this.cx = Context.enter();
+		this.scope = cx.initStandardObjects();
+		try {
+			URL script = ScriptLoader.class.getResource(scriptPath);
+			if (script == null)
+				throw new IOException();
+			InputStream scriptStream = script.openStream();
+			inputStreamReader = new InputStreamReader(scriptStream, FileUtil.UTF8);
+			cx.evaluateReader(scope, inputStreamReader, scriptPath, 1, null);
+		} catch (IOException e) {
+			throw new CatastrophicError("Could not load script " + scriptPath + ".", e);
+		} finally {
+			if (inputStreamReader != null)
+				FileUtil.close(inputStreamReader);
+		}
+	}
+
+	/**
+	 * Read a global variable.
+	 */
+	public Object readGlobal(String name) {
+		return scope.get(name, scope);
+	}
+
+	/**
+	 * Read an object property; the property name may be a path of several individual
+	 * names separated by dots.
+	 *
+	 * @return The value of the property, or {@literal null} if it could not be found.
+	 */
+	public Object readProperty(Object obj, String prop) {
+		Object res = obj;
+		for (String p : prop.split("\\."))
+			res = ScriptableObject.getProperty((ScriptableObject)res, p);
+		if (res == UniqueTag.NOT_FOUND)
+			return null;
+		return res;
+	}
+
+	/**
+	 * Read an array element.
+	 *
+	 * @return The value of the element, or {@literal null} if it could not be found.
+	 */
+	public Object readProperty(Object obj, int idx) {
+		Object res = ((ScriptableObject)obj).get(idx, scope);
+		if (res == UniqueTag.NOT_FOUND)
+			return null;
+		return res;
+	}
+
+	/**
+	 * Read an object property and return its value cast to an integer.
+	 */
+	public Integer readIntProperty(Object obj, String prop) {
+		Object res = readProperty(obj, prop);
+		if (res == null || res == Undefined.instance)
+			return null;
+		return ((Number)res).intValue();
+	}
+
+	/**
+	 * Read an array element and return its value cast to an integer.
+	 */
+	public Integer readIntProperty(Object obj, int idx) {
+		Object res = readProperty(obj, idx);
+		if (res == null || res == Undefined.instance)
+			return null;
+		return ((Number)res).intValue();
+	}
+
+	/**
+	 * Read an object property and return its value cast to a string.
+	 */
+	public String readStringProperty(Object obj, String prop) {
+		Object val = readProperty(obj, prop);
+		if (val == null || val == Undefined.instance)
+			return null;
+		return String.valueOf(val);
+	}
+
+	/**
+	 * Create an empty JavaScript array.
+	 */
+	public NativeArray mkArray() {
+		return (NativeArray)cx.newArray(scope, 0);
+	}
+
+	/**
+	 * Create a JavaScript object.
+	 *
+	 * @param properties a list of alternating keys and values to populate the object with
+	 */
+	public NativeObject mkObject(Object... properties) {
+		NativeObject obj = new NativeObject();
+		for (int i=0; i+1<properties.length; i += 2)
+			obj.defineProperty((String)properties[i], properties[i+1], 0);
+		return obj;
+	}
+
+	/**
+	 * Call a method on an object.
+	 */
+	public Object callMethod(ScriptableObject obj, String method, Object... args) {
+		Function f = (Function)readProperty(obj, method);
+		return f.call(cx, scope, obj, args);
+	}
+
+	/**
+	 * Construct an instance of a JavaScript constructor function.
+	 */
+	public ScriptableObject construct(Function ctor, Object... args) {
+		return (ScriptableObject)ctor.construct(cx, scope, args);
+	}
+
+	/**
+	 * Pretty-print an object as JSON.
+	 */
+	public String stringify(Object obj) {
+		return (String) NativeJSON.stringify(cx, scope, obj, null, 2);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/TypeScriptASTConverter.java b/javascript/extractor/src/com/semmle/js/parser/TypeScriptASTConverter.java
new file mode 100644
index 00000000000..59fcb87a75c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/TypeScriptASTConverter.java
@@ -0,0 +1,2355 @@
+package com.semmle.js.parser;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonPrimitive;
+import com.semmle.jcorn.TokenType;
+import com.semmle.js.ast.ArrayExpression;
+import com.semmle.js.ast.ArrayPattern;
+import com.semmle.js.ast.ArrowFunctionExpression;
+import com.semmle.js.ast.AssignmentExpression;
+import com.semmle.js.ast.AssignmentPattern;
+import com.semmle.js.ast.AwaitExpression;
+import com.semmle.js.ast.BinaryExpression;
+import com.semmle.js.ast.BlockStatement;
+import com.semmle.js.ast.BreakStatement;
+import com.semmle.js.ast.CallExpression;
+import com.semmle.js.ast.CatchClause;
+import com.semmle.js.ast.ClassBody;
+import com.semmle.js.ast.ClassDeclaration;
+import com.semmle.js.ast.ClassExpression;
+import com.semmle.js.ast.Comment;
+import com.semmle.js.ast.ConditionalExpression;
+import com.semmle.js.ast.ContinueStatement;
+import com.semmle.js.ast.DebuggerStatement;
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.DoWhileStatement;
+import com.semmle.js.ast.DynamicImport;
+import com.semmle.js.ast.EmptyStatement;
+import com.semmle.js.ast.ExportAllDeclaration;
+import com.semmle.js.ast.ExportDeclaration;
+import com.semmle.js.ast.ExportDefaultDeclaration;
+import com.semmle.js.ast.ExportNamedDeclaration;
+import com.semmle.js.ast.ExportSpecifier;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.ExpressionStatement;
+import com.semmle.js.ast.FieldDefinition;
+import com.semmle.js.ast.ForInStatement;
+import com.semmle.js.ast.ForOfStatement;
+import com.semmle.js.ast.ForStatement;
+import com.semmle.js.ast.FunctionDeclaration;
+import com.semmle.js.ast.FunctionExpression;
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.IPattern;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.IfStatement;
+import com.semmle.js.ast.ImportDeclaration;
+import com.semmle.js.ast.ImportDefaultSpecifier;
+import com.semmle.js.ast.ImportNamespaceSpecifier;
+import com.semmle.js.ast.ImportSpecifier;
+import com.semmle.js.ast.InvokeExpression;
+import com.semmle.js.ast.LabeledStatement;
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.MemberExpression;
+import com.semmle.js.ast.DeclarationFlags;
+import com.semmle.js.ast.MetaProperty;
+import com.semmle.js.ast.MethodDefinition;
+import com.semmle.js.ast.MethodDefinition.Kind;
+import com.semmle.js.ast.NewExpression;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.ObjectExpression;
+import com.semmle.js.ast.ObjectPattern;
+import com.semmle.js.ast.ParenthesizedExpression;
+import com.semmle.js.ast.Position;
+import com.semmle.js.ast.Program;
+import com.semmle.js.ast.Property;
+import com.semmle.js.ast.RestElement;
+import com.semmle.js.ast.ReturnStatement;
+import com.semmle.js.ast.SequenceExpression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.SpreadElement;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Super;
+import com.semmle.js.ast.SwitchCase;
+import com.semmle.js.ast.SwitchStatement;
+import com.semmle.js.ast.TaggedTemplateExpression;
+import com.semmle.js.ast.TemplateElement;
+import com.semmle.js.ast.TemplateLiteral;
+import com.semmle.js.ast.ThisExpression;
+import com.semmle.js.ast.ThrowStatement;
+import com.semmle.js.ast.Token;
+import com.semmle.js.ast.TryStatement;
+import com.semmle.js.ast.UnaryExpression;
+import com.semmle.js.ast.UpdateExpression;
+import com.semmle.js.ast.VariableDeclaration;
+import com.semmle.js.ast.VariableDeclarator;
+import com.semmle.js.ast.WhileStatement;
+import com.semmle.js.ast.WithStatement;
+import com.semmle.js.ast.YieldExpression;
+import com.semmle.js.ast.jsx.IJSXAttribute;
+import com.semmle.js.ast.jsx.IJSXName;
+import com.semmle.js.ast.jsx.JSXAttribute;
+import com.semmle.js.ast.jsx.JSXClosingElement;
+import com.semmle.js.ast.jsx.JSXElement;
+import com.semmle.js.ast.jsx.JSXEmptyExpression;
+import com.semmle.js.ast.jsx.JSXExpressionContainer;
+import com.semmle.js.ast.jsx.JSXIdentifier;
+import com.semmle.js.ast.jsx.JSXMemberExpression;
+import com.semmle.js.ast.jsx.JSXOpeningElement;
+import com.semmle.js.ast.jsx.JSXSpreadAttribute;
+import com.semmle.js.parser.JSParser.Result;
+import com.semmle.ts.ast.ArrayTypeExpr;
+import com.semmle.ts.ast.ConditionalTypeExpr;
+import com.semmle.ts.ast.DecoratorList;
+import com.semmle.ts.ast.EnumDeclaration;
+import com.semmle.ts.ast.EnumMember;
+import com.semmle.ts.ast.ExportAsNamespaceDeclaration;
+import com.semmle.ts.ast.ExportWholeDeclaration;
+import com.semmle.ts.ast.ExpressionWithTypeArguments;
+import com.semmle.ts.ast.ExternalModuleDeclaration;
+import com.semmle.ts.ast.ExternalModuleReference;
+import com.semmle.ts.ast.FunctionTypeExpr;
+import com.semmle.ts.ast.GenericTypeExpr;
+import com.semmle.ts.ast.GlobalAugmentationDeclaration;
+import com.semmle.ts.ast.INodeWithSymbol;
+import com.semmle.ts.ast.ITypeExpression;
+import com.semmle.ts.ast.ITypedAstNode;
+import com.semmle.ts.ast.ImportTypeExpr;
+import com.semmle.ts.ast.ImportWholeDeclaration;
+import com.semmle.ts.ast.IndexedAccessTypeExpr;
+import com.semmle.ts.ast.InferTypeExpr;
+import com.semmle.ts.ast.InterfaceDeclaration;
+import com.semmle.ts.ast.InterfaceTypeExpr;
+import com.semmle.ts.ast.IntersectionTypeExpr;
+import com.semmle.ts.ast.IsTypeExpr;
+import com.semmle.ts.ast.KeyofTypeExpr;
+import com.semmle.ts.ast.KeywordTypeExpr;
+import com.semmle.ts.ast.MappedTypeExpr;
+import com.semmle.ts.ast.NamespaceDeclaration;
+import com.semmle.ts.ast.NonNullAssertion;
+import com.semmle.ts.ast.OptionalTypeExpr;
+import com.semmle.ts.ast.ParenthesizedTypeExpr;
+import com.semmle.ts.ast.RestTypeExpr;
+import com.semmle.ts.ast.TupleTypeExpr;
+import com.semmle.ts.ast.TypeAliasDeclaration;
+import com.semmle.ts.ast.TypeAssertion;
+import com.semmle.ts.ast.TypeParameter;
+import com.semmle.ts.ast.TypeofTypeExpr;
+import com.semmle.ts.ast.UnionTypeExpr;
+import com.semmle.util.collections.CollectionUtil;
+
+/**
+ * Utility class for converting a
+ * <a href="https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API">TypeScript AST node</a>
+ * into a {@link Result}.
+ *
+ * TypeScript AST nodes that have no JavaScript equivalent are omitted.
+ */
+public class TypeScriptASTConverter {
+	private String source;
+	private final JsonObject nodeFlags;
+	private final JsonObject syntaxKinds;
+	private final Map<Integer, String> nodeFlagMap = new LinkedHashMap<>();
+	private final Map<Integer, String> syntaxKindMap = new LinkedHashMap<>();
+
+	private int syntaxKindExtends;
+
+	private final static Pattern LINE_TERMINATOR = Pattern.compile("\\n|\\r\\n|\\r|\\u2028|\\u2029");
+	private static final String WHITESPACE_CHAR = "(?:\\s|//.*|/\\*(?:[^*]|\\*(?!/))*\\*/)";
+	private static final Pattern WHITESPACE = Pattern.compile("^" + WHITESPACE_CHAR + "*");
+	private static final Pattern EXPORT_DECL_START = Pattern.compile("^export" +
+																	"(" + WHITESPACE_CHAR + "+default)?" +
+																	WHITESPACE_CHAR + "+");
+	private static final Pattern TYPEOF_START = Pattern.compile("^typeof" + WHITESPACE_CHAR + "+");
+	private static final Pattern WHITESPACE_END_PAREN = Pattern.compile("^" + WHITESPACE_CHAR + "*\\)");
+
+	TypeScriptASTConverter(JsonObject nodeFlags, JsonObject syntaxKinds) {
+		this.nodeFlags = nodeFlags;
+		this.syntaxKinds = syntaxKinds;
+		makeEnumIdMap(nodeFlags, nodeFlagMap);
+		makeEnumIdMap(syntaxKinds, syntaxKindMap);
+		this.syntaxKindExtends = getSyntaxKind("ExtendsKeyword");
+	}
+
+	/**
+	 * Builds a mapping from ID to name given a TypeScript enum object.
+	 */
+	private void makeEnumIdMap(JsonObject enumObject, Map<Integer, String> idToName) {
+		for (Map.Entry<String, JsonElement> entry : enumObject.entrySet()) {
+			JsonPrimitive prim = entry.getValue().getAsJsonPrimitive();
+			if (prim.isNumber() && !idToName.containsKey(prim.getAsInt())) {
+				idToName.put(prim.getAsInt(), entry.getKey());
+			}
+		}
+	}
+
+	/**
+	 * Convert the given TypeScript AST (which was parsed from {@code source})
+	 * into a parser {@link Result}.
+	 */
+	public Result convertAST(JsonObject ast, String source) {
+		List<ParseError> errors = new ArrayList<ParseError>();
+
+		// process parse diagnostics (i.e., syntax errors) reported by the TypeScript compiler
+		JsonArray parseDiagnostics = ast.get("parseDiagnostics").getAsJsonArray();
+		if (parseDiagnostics.size() > 0) {
+			for (JsonElement elt : parseDiagnostics) {
+				JsonObject parseDiagnostic = elt.getAsJsonObject();
+				String message = parseDiagnostic.get("messageText").getAsString();
+				JsonObject pos = parseDiagnostic.get("$pos").getAsJsonObject();
+				int line = pos.get("line").getAsInt() + 1;
+				int column = pos.get("character").getAsInt();
+				int offset = pos.get("$offset").getAsInt();
+				errors.add(new ParseError(message, line, column, offset));
+			}
+			return new Result(source, null, new ArrayList<>(), new ArrayList<>(), errors);
+		}
+
+		this.source = source;
+
+		List<Token> tokens = new ArrayList<>();
+		List<Comment> comments = new ArrayList<>();
+		extractTokensAndComments(ast, tokens, comments);
+		Node converted;
+		try {
+			converted = convertNode(ast);
+		} catch (ParseError e) {
+			converted = null;
+			errors.add(e);
+		}
+		return new Result(source, converted, tokens, comments, errors);
+	}
+
+	/**
+	 * Extract tokens and comments from the given TypeScript AST.
+	 */
+	private void extractTokensAndComments(JsonObject ast, List<Token> tokens, List<Comment> comments) {
+		for (JsonElement elt : ast.get("$tokens").getAsJsonArray()) {
+			JsonObject token = elt.getAsJsonObject();
+			String text = token.get("text").getAsString();
+			Position start = getPosition(token.get("tokenPos").getAsJsonObject(), true);
+			Position end = advance(start, text);
+			SourceLocation loc = new SourceLocation(text, start, end);
+			String kind = getKind(token);
+			switch (kind) {
+			case "EndOfFileToken":
+				tokens.add(new Token(loc, Token.Type.EOF));
+				break;
+			case "SingleLineCommentTrivia":
+			case "MultiLineCommentTrivia":
+				String cookedText;
+				if (text.startsWith("//"))
+					cookedText = text.substring(2);
+				else
+					cookedText = text.substring(2, text.length()-2);
+				comments.add(new Comment(loc, cookedText));
+				break;
+			case "TemplateHead":
+			case "TemplateMiddle":
+			case "TemplateTail":
+			case "NoSubstitutionTemplateLiteral":
+				tokens.add(new Token(loc, Token.Type.STRING));
+				break;
+			case "Identifier":
+				tokens.add(new Token(loc, Token.Type.NAME));
+				break;
+			case "NumericLiteral":
+				tokens.add(new Token(loc, Token.Type.NUM));
+				break;
+			case "StringLiteral":
+				tokens.add(new Token(loc, Token.Type.STRING));
+				break;
+			case "RegularExpressionLiteral":
+				tokens.add(new Token(loc, Token.Type.REGEXP));
+				break;
+			default:
+				Token.Type tp;
+				if (kind.endsWith("Token")) {
+					tp = Token.Type.PUNCTUATOR;
+				} else if (kind.endsWith("Keyword")) {
+					if (text.equals("null"))
+						tp = Token.Type.NULL;
+					else if (text.equals("true"))
+						tp = Token.Type.TRUE;
+					else if (text.equals("false"))
+						tp = Token.Type.FALSE;
+					else
+						tp = Token.Type.KEYWORD;
+				} else {
+					continue;
+				}
+				tokens.add(new Token(loc, tp));
+			}
+		}
+	}
+
+	/**
+	 * Convert the given TypeScript node and its children into a JavaScript {@link Node}.
+	 */
+	private Node convertNode(JsonObject node) throws ParseError {
+		return convertNode(node, null);
+	}
+
+	/**
+	 * Convert the given TypeScript node and its children into a JavaScript
+	 * {@link Node}. If the TypesScript node has no explicit {@code kind}, it is
+	 * assumed to be {@code defaultKind}.
+	 */
+	private Node convertNode(JsonObject node, String defaultKind) throws ParseError {
+		Node astNode = convertNodeUntyped(node, defaultKind);
+		attachStaticType(astNode, node);
+		return astNode;
+	}
+
+	/**
+	 * Helper method for `convertNode` that does everything except attaching type
+	 * information.
+	 */
+	private Node convertNodeUntyped(JsonObject node, String defaultKind) throws ParseError {
+		String kind = getKind(node);
+		if (kind == null)
+			kind = defaultKind;
+		if (kind == null)
+			kind = "Identifier";
+		SourceLocation loc = getSourceLocation(node);
+		switch (kind) {
+		case "AnyKeyword":
+			return convertKeywordTypeExpr(node, loc, "any");
+		case "ArrayBindingPattern":
+			return convertArrayBindingPattern(node, loc);
+		case "ArrayLiteralExpression":
+			return convertArrayLiteralExpression(node, loc);
+		case "ArrayType":
+			return convertArrayType(node, loc);
+		case "ArrowFunction":
+			return convertArrowFunction(node, loc);
+		case "AsExpression":
+			return convertAsExpression(node, loc);
+		case "AwaitExpression":
+			return convertAwaitExpression(node, loc);
+		case "BinaryExpression":
+			return convertBinaryExpression(node, loc);
+		case "Block":
+			return convertBlock(node, loc);
+		case "BooleanKeyword":
+			return convertKeywordTypeExpr(node, loc, "boolean");
+		case "BreakStatement":
+			return convertBreakStatement(node, loc);
+		case "CallExpression":
+			return convertCallExpression(node, loc);
+		case "CallSignature":
+			return convertCallSignature(node, loc);
+		case "CaseClause":
+			return convertCaseClause(node, loc);
+		case "CatchClause":
+			return convertCatchClause(node, loc);
+		case "ClassDeclaration":
+		case "ClassExpression":
+			return convertClass(node, kind, loc);
+		case "CommaListExpression":
+			return convertCommaListExpression(node, loc);
+		case "ComputedPropertyName":
+			return convertComputedPropertyName(node);
+		case "ConditionalExpression":
+			return convertConditionalExpression(node, loc);
+		case "ConditionalType":
+			return convertConditionalType(node, loc);
+		case "Constructor":
+			return convertConstructor(node, loc);
+		case "ConstructSignature":
+			return convertConstructSignature(node, loc);
+		case "ConstructorType":
+			return convertConstructorType(node, loc);
+		case "ContinueStatement":
+			return convertContinueStatement(node, loc);
+		case "DebuggerStatement":
+			return convertDebuggerStatement(loc);
+		case "Decorator":
+			return convertDecorator(node, loc);
+		case "DefaultClause":
+			return convertCaseClause(node, loc);
+		case "DeleteExpression":
+			return convertDeleteExpression(node, loc);
+		case "DoStatement":
+			return convertDoStatement(node, loc);
+		case "ElementAccessExpression":
+			return convertElementAccessExpression(node, loc);
+		case "EmptyStatement":
+			return convertEmptyStatement(loc);
+		case "EnumDeclaration":
+			return convertEnumDeclaration(node, loc);
+		case "EnumMember":
+			return convertEnumMember(node, loc);
+		case "ExportAssignment":
+			return convertExportAssignment(node, loc);
+		case "ExportDeclaration":
+			return convertExportDeclaration(node, loc);
+		case "ExportSpecifier":
+			return convertExportSpecifier(node, loc);
+		case "ExpressionStatement":
+			return convertExpressionStatement(node, loc);
+		case "ExpressionWithTypeArguments":
+			return convertExpressionWithTypeArguments(node, loc);
+		case "ExternalModuleReference":
+			return convertExternalModuleReference(node, loc);
+		case "FalseKeyword":
+			return convertFalseKeyword(loc);
+		case "NeverKeyword":
+			return convertKeywordTypeExpr(node, loc, "never");
+		case "NumberKeyword":
+			return convertKeywordTypeExpr(node, loc, "number");
+		case "NumericLiteral":
+			return convertNumericLiteral(node, loc);
+		case "ForStatement":
+			return convertForStatement(node, loc);
+		case "ForInStatement":
+			return convertForInStatement(node, loc);
+		case "ForOfStatement":
+			return convertForOfStatement(node, loc);
+		case "FunctionDeclaration":
+			return convertFunctionDeclaration(node, loc);
+		case "FunctionExpression":
+			return convertFunctionExpression(node, loc);
+		case "FunctionType":
+			return convertFunctionType(node, loc);
+		case "Identifier":
+			return convertIdentifier(node, loc);
+		case "IfStatement":
+			return convertIfStatement(node, loc);
+		case "ImportClause":
+			return convertImportClause(node, loc);
+		case "ImportDeclaration":
+			return convertImportDeclaration(node, loc);
+		case "ImportEqualsDeclaration":
+			return convertImportEqualsDeclaration(node, loc);
+		case "ImportKeyword":
+			return convertImportKeyword(loc);
+		case "ImportSpecifier":
+			return convertImportSpecifier(node, loc);
+		case "ImportType":
+			return convertImportType(node, loc);
+		case "IndexSignature":
+			return convertIndexSignature(node, loc);
+		case "IndexedAccessType":
+			return convertIndexedAccessType(node, loc);
+		case "InferType":
+			return convertInferType(node, loc);
+		case "InterfaceDeclaration":
+			return convertInterfaceDeclaration(node, loc);
+		case "IntersectionType":
+			return convertIntersectionType(node, loc);
+		case "JsxAttribute":
+			return convertJsxAttribute(node, loc);
+		case "JsxClosingElement":
+			return convertJsxClosingElement(node, loc);
+		case "JsxElement":
+			return convertJsxElement(node, loc);
+		case "JsxExpression":
+			return convertJsxExpression(node, loc);
+		case "JsxFragment":
+			return convertJsxFragment(node, loc);
+		case "JsxOpeningElement":
+			return convertJsxOpeningElement(node, loc);
+		case "JsxOpeningFragment":
+			return convertJsxOpeningFragment(node, loc);
+		case "JsxSelfClosingElement":
+			return convertJsxSelfClosingElement(node, loc);
+		case "JsxClosingFragment":
+			return convertJsxClosingFragment(node, loc);
+		case "JsxSpreadAttribute":
+			return convertJsxSpreadAttribute(node, loc);
+		case "JsxText":
+		case "JsxTextAllWhiteSpaces":
+			return convertJsxText(node, loc);
+		case "LabeledStatement":
+			return convertLabeledStatement(node, loc);
+		case "LiteralType":
+			return convertLiteralType(node, loc);
+		case "MappedType":
+			return convertMappedType(node, loc);
+		case "MetaProperty":
+			return convertMetaProperty(node, loc);
+		case "GetAccessor":
+		case "SetAccessor":
+		case "MethodDeclaration":
+		case "MethodSignature":
+			return convertMethodDeclaration(node, kind, loc);
+		case "ModuleDeclaration":
+		case "NamespaceDeclaration":
+			return convertNamespaceDeclaration(node, loc);
+		case "ModuleBlock":
+			return convertModuleBlock(node, loc);
+		case "NamespaceExportDeclaration":
+			return convertNamespaceExportDeclaration(node, loc);
+		case "NamespaceImport":
+			return convertNamespaceImport(node, loc);
+		case "NewExpression":
+			return convertNewExpression(node, loc);
+		case "NonNullExpression":
+			return convertNonNullExpression(node, loc);
+		case "NoSubstitutionTemplateLiteral":
+			return convertNoSubstitutionTemplateLiteral(node, loc);
+		case "NullKeyword":
+			return convertNullKeyword(loc);
+		case "ObjectBindingPattern":
+			return convertObjectBindingPattern(node, loc);
+		case "ObjectKeyword":
+			return convertKeywordTypeExpr(node, loc, "object");
+		case "ObjectLiteralExpression":
+			return convertObjectLiteralExpression(node, loc);
+		case "OmittedExpression":
+			return convertOmittedExpression();
+		case "OptionalType":
+			return convertOptionalType(node, loc);
+		case "Parameter":
+			return convertParameter(node, loc);
+		case "ParenthesizedExpression":
+			return convertParenthesizedExpression(node, loc);
+		case "ParenthesizedType":
+			return convertParenthesizedType(node, loc);
+		case "PostfixUnaryExpression":
+			return convertPostfixUnaryExpression(node, loc);
+		case "PrefixUnaryExpression":
+			return convertPrefixUnaryExpression(node, loc);
+		case "PropertyAccessExpression":
+			return convertPropertyAccessExpression(node, loc);
+		case "PropertyAssignment":
+			return convertPropertyAssignment(node, loc);
+		case "PropertyDeclaration":
+		case "PropertySignature":
+			return convertPropertyDeclaration(node, kind, loc);
+		case "RegularExpressionLiteral":
+			return convertRegularExpressionLiteral(loc);
+		case "RestType":
+			return convertRestType(node, loc);
+		case "QualifiedName":
+			return convertQualifiedName(node, loc);
+		case "ReturnStatement":
+			return convertReturnStatement(node, loc);
+		case "SemicolonClassElement":
+			return convertSemicolonClassElement();
+		case "SourceFile":
+			return convertSourceFile(node, loc);
+		case "ShorthandPropertyAssignment":
+			return convertShorthandPropertyAssignment(node, loc);
+		case "SpreadAssignment":
+		case "SpreadElement":
+		case "SpreadElementExpression":
+			return convertSpreadElement(node, loc);
+		case "StringKeyword":
+			return convertKeywordTypeExpr(node, loc, "string");
+		case "StringLiteral":
+			return convertStringLiteral(node, loc);
+		case "SuperKeyword":
+			return convertSuperKeyword(loc);
+		case "SwitchStatement":
+			return convertSwitchStatement(node, loc);
+		case "SymbolKeyword":
+			return convertKeywordTypeExpr(node, loc, "symbol");
+		case "TaggedTemplateExpression":
+			return convertTaggedTemplateExpression(node, loc);
+		case "TemplateExpression":
+			return convertTemplateExpression(node, loc);
+		case "TemplateHead":
+		case "TemplateMiddle":
+		case "TemplateTail":
+			return convertTemplateElement(node, kind, loc);
+		case "ThisKeyword":
+			return convertThisKeyword(loc);
+		case "ThisType":
+			return convertKeywordTypeExpr(node, loc, "this");
+		case "ThrowStatement":
+			return convertThrowStatement(node, loc);
+		case "TrueKeyword":
+			return convertTrueKeyword(loc);
+		case "TryStatement":
+			return convertTryStatement(node, loc);
+		case "TupleType":
+			return convertTupleType(node, loc);
+		case "TypeAliasDeclaration":
+			return convertTypeAliasDeclaration(node, loc);
+		case "TypeAssertionExpression":
+			return convertTypeAssertionExpression(node, loc);
+		case "TypeLiteral":
+			return convertTypeLiteral(node, loc);
+		case "TypeOfExpression":
+			return convertTypeOfExpression(node, loc);
+		case "TypeOperator":
+			return convertTypeOperator(node, loc);
+		case "TypeParameter":
+			return convertTypeParameter(node, loc);
+		case "TypePredicate":
+			return convertTypePredicate(node, loc);
+		case "TypeReference":
+			return convertTypeReference(node, loc);
+		case "TypeQuery":
+			return convertTypeQuery(node, loc);
+		case "UndefinedKeyword":
+			return convertKeywordTypeExpr(node, loc, "undefined");
+		case "UnionType":
+			return convertUnionType(node, loc);
+		case "UnknownKeyword":
+			return convertKeywordTypeExpr(node, loc, "unknown");
+		case "VariableDeclaration":
+			return convertVariableDeclaration(node, loc);
+		case "VariableDeclarationList":
+			return convertVariableDeclarationList(node, loc);
+		case "VariableStatement":
+			return convertVariableStatement(node, loc);
+		case "VoidExpression":
+			return convertVoidExpression(node, loc);
+		case "VoidKeyword":
+			return convertKeywordTypeExpr(node, loc, "void");
+		case "WhileStatement":
+			return convertWhileStatement(node, loc);
+		case "WithStatement":
+			return convertWithStatement(node, loc);
+		case "YieldExpression":
+			return convertYieldExpression(node, loc);
+		default:
+			throw new ParseError("Unsupported TypeScript syntax " + kind, getSourceLocation(node).getStart());
+		}
+	}
+
+	/**
+	 * Attaches type information from the JSON object to the given AST node, if
+	 * applicable. This is called from {@link #convertNode}.
+	 */
+	private void attachStaticType(Node astNode, JsonObject json) {
+		if (astNode instanceof ITypedAstNode && json.has("$type")) {
+			ITypedAstNode typedAstNode = (ITypedAstNode) astNode;
+			int typeId = json.get("$type").getAsInt();
+			typedAstNode.setStaticTypeId(typeId);
+		}
+	}
+
+	/**
+	 * Attaches a TypeScript compiler symbol to the given node, if any was provided.
+	 */
+	private void attachSymbolInformation(INodeWithSymbol node, JsonObject json) {
+		if (json.has("$symbol")) {
+			int symbol = json.get("$symbol").getAsInt();
+			node.setSymbol(symbol);
+		}
+	}
+
+	/**
+	 * Attaches call signatures and related symbol information to a call site.
+	 */
+	private void attachResolvedSignature(InvokeExpression node, JsonObject json) {
+		if (json.has("$resolvedSignature")) {
+			int id = json.get("$resolvedSignature").getAsInt();
+			node.setResolvedSignatureId(id);
+		}
+		if (json.has("$overloadIndex")) {
+			int id = json.get("$overloadIndex").getAsInt();
+			node.setOverloadIndex(id);
+		}
+		attachSymbolInformation(node, json);
+	}
+
+	/**
+	 * Convert the given array of TypeScript AST nodes into a list of JavaScript AST nodes,
+	 * skipping any {@code null} elements.
+	 */
+	private <T extends INode> List<T> convertNodes(Iterable<JsonElement> nodes) throws ParseError {
+		return convertNodes(nodes, true);
+	}
+
+	/**
+	 * Convert the given array of TypeScript AST nodes into a list of JavaScript AST nodes,
+	 * where {@code skipNull} indicates whether {@code null} elements should be skipped or not.
+	 */
+	@SuppressWarnings("unchecked")
+	private <T extends INode> List<T> convertNodes(Iterable<JsonElement> nodes,
+			boolean skipNull) throws ParseError {
+		List<T> res = new ArrayList<T>();
+		for (JsonElement elt : nodes) {
+			T converted = (T)convertNode(elt.getAsJsonObject());
+			if (!skipNull || converted != null)
+				res.add(converted);
+		}
+		return res;
+	}
+
+	/**
+	 * Converts the given child to an AST node of the given type or <tt>null</tt>.
+	 * A ParseError is thrown if a different type of node was found.
+	 * <p>
+	 * This is used to detect syntax errors that are not reported as syntax errors
+	 * by the TypeScript parser. Usually they are reported as errors in a later
+	 * compiler stage, which the extractor does not run.
+	 * <p>
+	 * Returns <tt>null</tt> if the child is absent.
+	 */
+	@SuppressWarnings("unchecked")
+	private <T extends Node> T tryConvertChild(JsonObject node, String prop, Class<T> expectedType) throws ParseError {
+		Node child = convertChild(node, prop);
+		if (child == null || expectedType.isInstance(child)) {
+			return (T) child;
+		} else {
+			throw new ParseError("Unsupported TypeScript syntax", getSourceLocation(node).getStart());
+		}
+	}
+
+	/**
+	 * Convert the child node named {@code prop} of AST node {@code node}.
+	 */
+	private <T extends Node> T convertChild(JsonObject node, String prop) throws ParseError {
+		return convertChild(node, prop, null);
+	}
+
+	/**
+	 * Convert the child node named {@code prop} of AST node {@code node}, with
+	 * {@code kind} as its default kind.
+	 */
+	@SuppressWarnings("unchecked")
+	private <T extends INode> T convertChild(JsonObject node, String prop, String kind) throws ParseError {
+		JsonElement child = node.get(prop);
+		if (child == null)
+			return null;
+		return (T)convertNode(child.getAsJsonObject(), kind);
+	}
+
+	/**
+	 * Convert the child nodes named {@code prop} of AST node {@code node}.
+	 */
+	private <T extends INode> List<T> convertChildren(JsonObject node, String prop) throws ParseError {
+		return convertChildren(node, prop, true);
+	}
+
+	/**
+	 * Like convertChildren but returns an empty list if the property is missing.
+	 */
+	private <T extends INode> List<T> convertChildrenNotNull(JsonObject node, String prop) throws ParseError {
+		List<T> nodes = convertChildren(node, prop, true);
+		if (nodes == null) {
+			return Collections.emptyList();
+		}
+		return nodes;
+	}
+
+	/**
+	 * Convert the child nodes named {@code prop} of AST node {@code node}, where
+	 * {@code skipNull} indicates whether or not to skip null children.
+	 */
+	private <T extends INode> List<T> convertChildren(JsonObject node, String prop,
+			boolean skipNull) throws ParseError {
+		JsonElement child = node.get(prop);
+		if (child == null)
+			return null;
+		return convertNodes(child.getAsJsonArray(), skipNull);
+	}
+
+	/* Converter methods for the individual TypeScript AST node types. */
+
+	private Node convertArrayBindingPattern(JsonObject array, SourceLocation loc) throws ParseError {
+		List<Expression> elements = new ArrayList<>();
+		for (JsonElement elt : array.get("elements").getAsJsonArray()) {
+			JsonObject element = (JsonObject) elt;
+			SourceLocation eltLoc = getSourceLocation(element);
+			Expression convertedElt = convertChild(element, "name");
+			if (hasChild(element, "initializer"))
+				convertedElt = new AssignmentPattern(eltLoc, "=", convertedElt, convertChild(element, "initializer"));
+			else if (hasChild(element, "dotDotDotToken"))
+				convertedElt = new RestElement(eltLoc, convertedElt);
+			elements.add(convertedElt);
+		}
+		return new ArrayPattern(loc, elements);
+	}
+
+	private Node convertArrayLiteralExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ArrayExpression(loc, convertChildren(node, "elements", false));
+	}
+
+	private Node convertArrayType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ArrayTypeExpr(loc, convertChildAsType(node, "elementType"));
+	}
+
+	private Node convertArrowFunction(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ArrowFunctionExpression(loc, convertParameters(node), convertChild(node, "body"), false,
+				hasModifier(node, "AsyncKeyword"), convertChildrenNotNull(node, "typeParameters"), convertParameterTypes(node),
+				convertChildAsType(node, "type"));
+	}
+
+	private Node convertAsExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TypeAssertion(loc, convertChild(node, "expression"), convertChildAsType(node, "type"), true);
+	}
+
+	private Node convertAwaitExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new AwaitExpression(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertBinaryExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		Expression left = convertChild(node, "left");
+		Expression right = convertChild(node, "right");
+		JsonObject operatorToken = node.get("operatorToken").getAsJsonObject();
+		String operatorKind = getKind(operatorToken);
+		if ("CommaToken".equals(operatorKind)) {
+			List<Expression> expressions = new ArrayList<Expression>();
+			if (left instanceof SequenceExpression)
+				expressions.addAll(((SequenceExpression) left).getExpressions());
+			else
+				expressions.add(left);
+			if (right instanceof SequenceExpression)
+				expressions.addAll(((SequenceExpression) right).getExpressions());
+			else
+				expressions.add(right);
+			return new SequenceExpression(loc, expressions);
+		} else {
+			String operator = getSourceLocation(operatorToken).getSource();
+			if ("EqualsToken".equals(operatorKind))
+				left = convertLValue(left);
+			return new BinaryExpression(loc, operator, left, right);
+		}
+	}
+
+	private Node convertBlock(JsonObject node, SourceLocation loc) throws ParseError {
+		return new BlockStatement(loc, convertChildren(node, "statements"));
+	}
+
+	private Node convertBreakStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new BreakStatement(loc, convertChild(node, "label"));
+	}
+
+	private Node convertCallExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		List<Expression> arguments = convertChildren(node, "arguments");
+		if (arguments.size() == 1 && hasKind(node.get("expression"), "ImportKeyword")) {
+			return new DynamicImport(loc, arguments.get(0));
+		}
+		Expression callee = convertChild(node, "expression");
+		List<ITypeExpression> typeArguments = convertChildrenAsTypes(node, "typeArguments");
+		CallExpression call = new CallExpression(loc, callee, typeArguments, arguments);
+		attachResolvedSignature(call, node);
+		return call;
+	}
+
+	private MethodDefinition convertCallSignature(JsonObject node, SourceLocation loc) throws ParseError {
+		FunctionExpression function = convertImplicitFunction(node, loc);
+		int flags = getMemberModifierKeywords(node) | DeclarationFlags.abstract_;
+		return new MethodDefinition(loc, flags, Kind.FUNCTION_CALL_SIGNATURE, null, function);
+	}
+
+	private Node convertCaseClause(JsonObject node, SourceLocation loc) throws ParseError {
+		return convertDefaultClause(node, loc);
+	}
+
+	private Node convertCatchClause(JsonObject node, SourceLocation loc) throws ParseError {
+		IPattern pattern = null;
+		JsonElement variableDecl = node.get("variableDeclaration");
+		if (variableDecl != null)
+			pattern = convertChild(variableDecl.getAsJsonObject(), "name");
+		return new CatchClause(loc, pattern, null, convertChild(node, "block"));
+	}
+
+	private List<ITypeExpression> convertSuperInterfaceClause(JsonArray supers) throws ParseError {
+		List<ITypeExpression> result = new ArrayList<>();
+		for (JsonElement elt : supers) {
+			JsonObject superType = elt.getAsJsonObject();
+			ITypeExpression objectType = convertChildAsType(superType, "expression");
+			if (objectType == null)
+				continue;
+			List<ITypeExpression> typeArguments = convertChildrenAsTypes(superType, "typeArguments");
+			if (typeArguments.isEmpty()) {
+				result.add(objectType);
+			} else {
+				result.add(new GenericTypeExpr(getSourceLocation(superType), objectType, typeArguments));
+			}
+		}
+		return result;
+	}
+
+	private Node convertClass(JsonObject node, String kind, SourceLocation loc) throws ParseError {
+		Identifier id = convertChild(node, "name");
+		List<TypeParameter> typeParameters = convertChildrenNotNull(node, "typeParameters");
+		Expression superClass = null;
+		List<ITypeExpression> superInterfaces = null;
+		int afterHead = id == null ? loc.getStart().getOffset() + 5 : id.getLoc().getEnd().getOffset();
+		for (JsonElement elt : getChildIterable(node, "heritageClauses")) {
+			JsonObject heritageClause = elt.getAsJsonObject();
+			JsonArray supers = heritageClause.get("types").getAsJsonArray();
+			if (heritageClause.get("token").getAsInt() == syntaxKindExtends) {
+				if (supers.size() > 0) {
+					superClass = (Expression) convertNode(supers.get(0).getAsJsonObject());
+				}
+			} else {
+				superInterfaces = convertSuperInterfaceClause(supers);
+			}
+			afterHead = heritageClause.get("$end").getAsJsonObject().get("$offset").getAsInt();
+		}
+		if (superInterfaces == null) {
+			superInterfaces = new ArrayList<>();
+		}
+		String skip = source.substring(loc.getStart().getOffset(), afterHead) + matchWhitespace(afterHead);
+		SourceLocation bodyLoc = new SourceLocation(loc.getSource(), loc.getStart(), loc.getEnd());
+		advance(bodyLoc, skip);
+		ClassBody body = new ClassBody(bodyLoc, convertChildren(node, "members"));
+		if ("ClassExpression".equals(kind)) {
+			ClassExpression classExpr = new ClassExpression(loc, id, typeParameters, superClass, superInterfaces, body);
+			attachSymbolInformation(classExpr.getClassDef(), node);
+			return classExpr;
+		}
+		boolean hasDeclareKeyword = hasModifier(node, "DeclareKeyword");
+		boolean hasAbstractKeyword = hasModifier(node, "AbstractKeyword");
+		ClassDeclaration classDecl = new ClassDeclaration(loc, id, typeParameters, superClass, superInterfaces, body, hasDeclareKeyword,
+				hasAbstractKeyword);
+		attachSymbolInformation(classDecl.getClassDef(), node);
+		if (node.has("decorators")) {
+			classDecl.addDecorators(convertChildren(node, "decorators"));
+			advanceUntilAfter(loc, classDecl.getDecorators());
+		}
+		return fixExports(loc, classDecl);
+	}
+
+	private Node convertCommaListExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new SequenceExpression(loc, convertChildren(node, "elements"));
+	}
+
+	private Node convertComputedPropertyName(JsonObject node) throws ParseError {
+		return convertChild(node, "expression");
+	}
+
+	private Node convertConditionalExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new ConditionalExpression(loc, convertChild(node, "condition"), convertChild(node, "whenTrue"), convertChild(node, "whenFalse"));
+	}
+
+	private Node convertConditionalType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ConditionalTypeExpr(loc, convertChild(node, "checkType"), convertChild(node, "extendsType"),
+				convertChild(node, "trueType"), convertChild(node, "falseType"));
+	}
+
+	private SourceLocation getSourceRange(Position from, Position to) {
+		return new SourceLocation(source.substring(from.getOffset(), to.getOffset()), from, to);
+	}
+
+	private DecoratorList makeDecoratorList(JsonElement decorators) throws ParseError {
+		if (!(decorators instanceof JsonArray)) return null;
+		JsonArray array = decorators.getAsJsonArray();
+		SourceLocation firstLoc = null, lastLoc = null;
+		List<Decorator> list = new ArrayList<>();
+		for (JsonElement decoratorElm : array) {
+			JsonObject decorator = decoratorElm.getAsJsonObject();
+			if (hasKind(decorator, "Decorator")) {
+				SourceLocation location = getSourceLocation(decorator);
+				list.add(convertDecorator(decorator, location));
+				if (firstLoc == null) {
+					firstLoc = location;
+				}
+				lastLoc = location;
+			}
+		}
+		if (firstLoc == null)
+			return null;
+		return new DecoratorList(getSourceRange(firstLoc.getStart(), lastLoc.getEnd()), list);
+	}
+
+	private List<DecoratorList> convertParameterDecorators(JsonObject function) throws ParseError {
+		List<DecoratorList> decoratorLists = new ArrayList<>();
+		for (JsonElement parameter : getProperParameters(function)) {
+			decoratorLists.add(makeDecoratorList(parameter.getAsJsonObject().get("decorators")));
+		}
+		return decoratorLists;
+	}
+
+	private Node convertConstructor(JsonObject node, SourceLocation loc) throws ParseError {
+		int flags = getMemberModifierKeywords(node);
+		boolean isComputed = hasComputedName(node);
+		boolean isStatic = DeclarationFlags.isStatic(flags);
+		if (isComputed) {
+			flags |= DeclarationFlags.computed;
+		}
+		// for some reason, the TypeScript compiler treats static methods named "constructor"
+		// and methods with computed name "constructor" as constructors, even though they aren't
+		MethodDefinition.Kind methodKind = isStatic || isComputed ? Kind.METHOD : Kind.CONSTRUCTOR;
+		Expression key;
+		if (isComputed)
+			key = convertChild((JsonObject) node.get("name"), "expression");
+		else
+			key = new Identifier(loc, "constructor");
+		List<Expression> params = convertParameters(node);
+		List<ITypeExpression> paramTypes = convertParameterTypes(node);
+		List<DecoratorList> paramDecorators = convertParameterDecorators(node);
+		FunctionExpression value = new FunctionExpression(loc, null, params, convertChild(node, "body"), false, false,
+				Collections.emptyList(), paramTypes, paramDecorators, null, null);
+		attachSymbolInformation(value, node);
+		List<FieldDefinition> parameterFields = convertParameterFields(node);
+		return new MethodDefinition(loc, flags, methodKind, key, value, parameterFields);
+	}
+
+	private MethodDefinition convertConstructSignature(JsonObject node, SourceLocation loc) throws ParseError {
+		FunctionExpression function = convertImplicitFunction(node, loc);
+		int flags = getMemberModifierKeywords(node) | DeclarationFlags.abstract_;
+		return new MethodDefinition(loc, flags, Kind.CONSTRUCTOR_CALL_SIGNATURE, null, function);
+	}
+
+	private Node convertConstructorType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new FunctionTypeExpr(loc, convertImplicitFunction(node, loc), true);
+	}
+
+	private Node convertContinueStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ContinueStatement(loc, convertChild(node, "label"));
+	}
+
+	private Node convertDebuggerStatement(SourceLocation loc) {
+		return new DebuggerStatement(loc);
+	}
+
+	private Decorator convertDecorator(JsonObject node, SourceLocation loc) throws ParseError {
+		return new Decorator(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertDefaultClause(JsonObject node, SourceLocation loc) throws ParseError {
+		return new SwitchCase(loc, convertChild(node, "expression"), convertChildren(node, "statements"));
+	}
+
+	private Node convertDeleteExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new UnaryExpression(loc, "delete", convertChild(node, "expression"), true);
+	}
+
+	private Node convertDoStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new DoWhileStatement(loc, convertChild(node, "expression"), convertChild(node, "statement"));
+	}
+
+	private Node convertElementAccessExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		Expression object = convertChild(node, "expression");
+		Expression property = convertChild(node, "argumentExpression");
+		return new MemberExpression(loc, object, property, true);
+	}
+
+	private Node convertEmptyStatement(SourceLocation loc) {
+		return new EmptyStatement(loc);
+	}
+
+	private Node convertEnumDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		EnumDeclaration enumDeclaration = new EnumDeclaration(loc, hasModifier(node, "ConstKeyword"), hasModifier(node, "DeclareKeyword"),
+				convertChildrenNotNull(node, "decorators"), convertChild(node, "name"), convertChildren(node, "members"));
+		attachSymbolInformation(enumDeclaration, node);
+		advanceUntilAfter(loc, enumDeclaration.getDecorators());
+		return fixExports(loc, enumDeclaration);
+	}
+
+	/**
+	 * Converts a TypeScript Identifier or StringLiteral node to an Identifier AST
+	 * node, or {@code null} if the given node is not of the expected kind.
+	 */
+	private Identifier convertNodeAsIdentifier(JsonObject node) throws ParseError {
+		SourceLocation loc = getSourceLocation(node);
+		if (isIdentifier(node)) {
+			return convertIdentifier(node, loc);
+		} else if (hasKind(node, "StringLiteral")) {
+			return new Identifier(loc, node.get("text").getAsString());
+		} else {
+			return null;
+		}
+	}
+
+	private Node convertEnumMember(JsonObject node, SourceLocation loc) throws ParseError {
+		Identifier name = convertNodeAsIdentifier(node.get("name").getAsJsonObject());
+		if (name == null)
+			return null;
+		EnumMember member = new EnumMember(loc, name, convertChild(node, "initializer"));
+		attachSymbolInformation(member, node);
+		return member;
+	}
+
+	private Node convertExportAssignment(JsonObject node, SourceLocation loc) throws ParseError {
+		if (hasChild(node, "isExportEquals") && node.get("isExportEquals").getAsBoolean())
+			return new ExportWholeDeclaration(loc, convertChild(node, "expression"));
+		return new ExportDefaultDeclaration(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertExportDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		Literal source = tryConvertChild(node, "moduleSpecifier", Literal.class);
+		if (hasChild(node, "exportClause")) {
+			return new ExportNamedDeclaration(loc, null, convertChildren(node.get("exportClause").getAsJsonObject(), "elements"), source);
+		} else {
+			return new ExportAllDeclaration(loc, source);
+		}
+	}
+
+	private Node convertExportSpecifier(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ExportSpecifier(loc, convertChild(node, hasChild(node, "propertyName") ? "propertyName" : "name"), convertChild(node, "name"));
+	}
+
+	private Node convertExpressionStatement(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		Expression expression = convertChild(node, "expression");
+		return new ExpressionStatement(loc, expression);
+	}
+
+	private Node convertExpressionWithTypeArguments(JsonObject node, SourceLocation loc) throws ParseError {
+		Expression expression = convertChild(node, "expression");
+		List<ITypeExpression> typeArguments = convertChildrenAsTypes(node, "typeArguments");
+		if (typeArguments.isEmpty())
+			return expression;
+		return new ExpressionWithTypeArguments(loc, expression, typeArguments);
+	}
+
+	private Node convertExternalModuleReference(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ExternalModuleReference(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertFalseKeyword(SourceLocation loc) {
+		return new Literal(loc, TokenType._false, false);
+	}
+
+	private Node convertNumericLiteral(JsonObject node, SourceLocation loc)
+			throws NumberFormatException {
+		return new Literal(loc, TokenType.num, Double.valueOf(node.get("text").getAsString()));
+	}
+
+	private Node convertForStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ForStatement(loc, convertChild(node, "initializer"), convertChild(node, "condition"), convertChild(node, "incrementor"), convertChild(node, "statement"));
+	}
+
+	private Node convertForInStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		Node initializer = convertChild(node, "initializer");
+		if (initializer instanceof Expression)
+			initializer = convertLValue((Expression) initializer);
+		return new ForInStatement(loc, initializer, convertChild(node, "expression"), convertChild(node, "statement"), false);
+	}
+
+	private Node convertForOfStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		Node initializer = convertChild(node, "initializer");
+		if (initializer instanceof Expression)
+			initializer = convertLValue((Expression) initializer);
+		return new ForOfStatement(loc, initializer, convertChild(node, "expression"), convertChild(node, "statement"));
+	}
+
+	private Node convertFunctionDeclaration(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		List<Expression> params = convertParameters(node);
+		Identifier fnId = convertChild(node, "name", "Identifier");
+		BlockStatement fnbody = convertChild(node, "body");
+		boolean generator = hasChild(node, "asteriskToken");
+		boolean async = hasModifier(node, "AsyncKeyword");
+		boolean hasDeclareKeyword = hasModifier(node, "DeclareKeyword");
+		List<ITypeExpression> paramTypes = convertParameterTypes(node);
+		List<TypeParameter> typeParameters = convertChildrenNotNull(node, "typeParameters");
+		ITypeExpression returnType = convertChildAsType(node, "type");
+		ITypeExpression thisParam = convertThisParameterType(node);
+		FunctionDeclaration function = new FunctionDeclaration(loc, fnId, params, fnbody, generator, async, hasDeclareKeyword,
+				typeParameters, paramTypes, returnType, thisParam);
+		attachSymbolInformation(function, node);
+		return fixExports(loc, function);
+	}
+
+	private Node convertFunctionExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		Identifier fnId = convertChild(node, "name", "Identifier");
+		List<Expression> params = convertParameters(node);
+		BlockStatement fnbody = convertChild(node, "body");
+		boolean generator = hasChild(node, "asteriskToken");
+		boolean async = hasModifier(node, "AsyncKeyword");
+		List<ITypeExpression> paramTypes = convertParameterTypes(node);
+		List<DecoratorList> paramDecorators = convertParameterDecorators(node);
+		ITypeExpression returnType = convertChildAsType(node, "type");
+		ITypeExpression thisParam = convertThisParameterType(node);
+		return new FunctionExpression(loc, fnId, params, fnbody, generator, async, convertChildrenNotNull(node, "typeParameters"),
+				paramTypes, paramDecorators, returnType, thisParam);
+	}
+
+	private Node convertFunctionType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new FunctionTypeExpr(loc, convertImplicitFunction(node, loc), false);
+	}
+
+	/**
+	 * Gets the original text out of an Identifier's "escapedText" field.
+	 */
+	private String unescapeLeadingUnderscores(String text) {
+		// The TypeScript compiler inserts an additional underscore in front of
+		// identifiers that begin with two underscores.
+		if (text.startsWith("___")) {
+			return text.substring(1);
+		} else {
+			return text;
+		}
+	}
+
+	/** Returns the contents of the given identifier as a string. */
+	private String getIdentifierText(JsonObject identifierNode) {
+		if (identifierNode.has("text"))
+			return identifierNode.get("text").getAsString();
+		else
+			return unescapeLeadingUnderscores(identifierNode.get("escapedText").getAsString());
+	}
+
+	private Identifier convertIdentifier(JsonObject node, SourceLocation loc) {
+		Identifier id = new Identifier(loc, getIdentifierText(node));
+		attachSymbolInformation(id, node);
+		return id;
+	}
+
+	private Node convertKeywordTypeExpr(JsonObject node, SourceLocation loc, String text) {
+		return new KeywordTypeExpr(loc, text);
+	}
+
+	private Node convertUnionType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new UnionTypeExpr(loc, convertChildrenAsTypes(node, "types"));
+	}
+
+	private Node convertIfStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new IfStatement(loc, convertChild(node, "expression"), convertChild(node, "thenStatement"), convertChild(node, "elseStatement"));
+	}
+
+	private Node convertImportClause(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ImportDefaultSpecifier(loc, convertChild(node, "name"));
+	}
+
+	private Node convertImportDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		Literal src = tryConvertChild(node, "moduleSpecifier", Literal.class);
+		List<ImportSpecifier> specifiers = new ArrayList<>();
+		if (hasChild(node, "importClause")) {
+			JsonObject importClause = node.get("importClause").getAsJsonObject();
+			if (hasChild(importClause, "name")) {
+				specifiers.add(convertChild(node, "importClause"));
+			}
+			if (hasChild(importClause, "namedBindings")) {
+				JsonObject namedBindings = importClause.get("namedBindings").getAsJsonObject();
+				if (hasKind(namedBindings, "NamespaceImport")) {
+					specifiers.add(convertChild(importClause, "namedBindings"));
+				} else {
+					specifiers.addAll(convertChildren(namedBindings, "elements"));
+				}
+			}
+		}
+		return new ImportDeclaration(loc, specifiers, src);
+	}
+
+	private Node convertImportEqualsDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		return fixExports(loc, new ImportWholeDeclaration(loc, convertChild(node, "name"), convertChild(node, "moduleReference")));
+	}
+
+	private Node convertImportKeyword(SourceLocation loc) {
+		return new Identifier(loc, "import");
+	}
+
+	private Node convertImportSpecifier(JsonObject node, SourceLocation loc) throws ParseError {
+		boolean hasImported = hasChild(node, "propertyName");
+		Identifier imported = convertChild(node, hasImported ? "propertyName" : "name");
+		Identifier local = convertChild(node, "name");
+		return new ImportSpecifier(loc, imported, local);
+	}
+
+	private Node convertImportType(JsonObject node, SourceLocation loc) throws ParseError {
+		// This is a type such as `import("./foo").bar.Baz`.
+		//
+		// The TypeScript AST represents import types as the root of a qualified name,
+		// whereas we represent them as the leftmost qualifier.
+		//
+		// So in our AST, ImportTypeExpr just represents `import("./foo")`, and `.bar.Baz`
+		// is represented by nested MemberExpr nodes.
+		//
+		// Additionally, an import type can be prefixed by `typeof`, such as `typeof import("foo")`.
+		// We convert these to TypeofTypeExpr.
+
+		// Get the source range of the `import(path)` part.
+		Position importStart = loc.getStart();
+		Position importEnd = loc.getEnd();
+		boolean isTypeof = false;
+		if (node.has("isTypeOf") && node.get("isTypeOf").getAsBoolean() == true) {
+			isTypeof = true;
+			Matcher m = TYPEOF_START.matcher(loc.getSource());
+			if (m.find()) {
+				importStart = advance(importStart, m.group(0));
+			}
+		}
+		// Find the ending parenthesis in `import(path)` by skipping whitespace after `path`.
+		ITypeExpression path = convertChild(node, "argument");
+		String endSrc = loc.getSource().substring(path.getLoc().getEnd().getOffset() - loc.getStart().getOffset());
+		Matcher m = WHITESPACE_END_PAREN.matcher(endSrc);
+		if (m.find()) {
+			importEnd = advance(path.getLoc().getEnd(), m.group(0));
+		}
+		SourceLocation importLoc = getSourceRange(importStart, importEnd);
+		ImportTypeExpr imprt = new ImportTypeExpr(importLoc, path);
+
+		ITypeExpression typeName = buildQualifiedTypeAccess(imprt, (JsonObject) node.get("qualifier"));
+		if (isTypeof) {
+			return new TypeofTypeExpr(loc, typeName);
+		}
+
+		List<ITypeExpression> typeArguments = convertChildrenAsTypes(node, "typeArguments");
+		if (!typeArguments.isEmpty()) {
+			return new GenericTypeExpr(loc, typeName, typeArguments);
+		}
+		return (Node) typeName;
+	}
+
+	/**
+	 * Converts the given JSON to a qualified name with `root` as the base.
+	 *
+	 * For example, `a.b.c` is converted to the AST corresponding to `root.a.b.c`.
+	 */
+	private ITypeExpression buildQualifiedTypeAccess(ITypeExpression root, JsonObject node) throws ParseError {
+		if (node == null) {
+			return root;
+		}
+		String kind = getKind(node);
+		ITypeExpression base;
+		Expression name;
+		if (kind == null || kind.equals("Identifier")) {
+			base = root;
+			name = convertIdentifier(node, getSourceLocation(node));
+		} else if (kind.equals("QualifiedName")) {
+			base = buildQualifiedTypeAccess(root, (JsonObject) node.get("left"));
+			name = convertChild(node, "right");
+		} else {
+			throw new ParseError("Unsupported syntax in import type", getSourceLocation(node).getStart());
+		}
+		MemberExpression member = new MemberExpression(getSourceLocation(node), (Expression) base, name, false);
+		attachSymbolInformation(member, node);
+		return member;
+	}
+
+	private Node convertIndexSignature(JsonObject node, SourceLocation loc) throws ParseError {
+		FunctionExpression function = convertImplicitFunction(node, loc);
+		int flags = getMemberModifierKeywords(node) | DeclarationFlags.abstract_;
+		return new MethodDefinition(loc, flags, Kind.INDEX_SIGNATURE, null, function);
+	}
+
+	private Node convertIndexedAccessType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new IndexedAccessTypeExpr(loc, convertChildAsType(node, "objectType"), convertChildAsType(node, "indexType"));
+	}
+
+	private Node convertInferType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new InferTypeExpr(loc, convertChild(node, "typeParameter"));
+	}
+
+	private Node convertInterfaceDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		Identifier name = convertChild(node, "name");
+		List<TypeParameter> typeParameters = convertChildrenNotNull(node, "typeParameters");
+		List<MemberDefinition<?>> members = convertChildren(node, "members");
+		List<ITypeExpression> superInterfaces = null;
+		for (JsonElement elt : getChildIterable(node, "heritageClauses")) {
+			JsonObject heritageClause = elt.getAsJsonObject();
+			if (heritageClause.get("token").getAsInt() == syntaxKindExtends) {
+				superInterfaces = convertSuperInterfaceClause(heritageClause.get("types").getAsJsonArray());
+				break;
+			}
+		}
+		if (superInterfaces == null) {
+			superInterfaces = new ArrayList<>();
+		}
+		InterfaceDeclaration iface = new InterfaceDeclaration(loc, name, typeParameters, superInterfaces, members);
+		attachSymbolInformation(iface, node);
+		return fixExports(loc, iface);
+	}
+
+	private Node convertIntersectionType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new IntersectionTypeExpr(loc, convertChildrenAsTypes(node, "types"));
+	}
+
+	private Node convertJsxAttribute(JsonObject node, SourceLocation loc) throws ParseError {
+		return new JSXAttribute(loc, convertJSXName(convertChild(node, "name")), convertChild(node, "initializer"));
+	}
+
+	private Node convertJsxClosingElement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new JSXClosingElement(loc, convertJSXName(convertChild(node, "tagName")));
+	}
+
+	private Node convertJsxElement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new JSXElement(loc, convertChild(node, "openingElement"), convertChildren(node, "children"), convertChild(node, "closingElement"));
+	}
+
+	private Node convertJsxExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		if (hasChild(node, "expression"))
+			return new JSXExpressionContainer(loc, convertChild(node, "expression"));
+		return new JSXExpressionContainer(loc, new JSXEmptyExpression(loc));
+	}
+
+	private Node convertJsxFragment(JsonObject node, SourceLocation loc) throws ParseError {
+		return new JSXElement(loc, convertChild(node, "openingFragment"), convertChildren(node, "children"),
+				convertChild(node, "closingFragment"));
+	}
+
+	private Node convertJsxOpeningFragment(JsonObject node, SourceLocation loc) {
+		return new JSXOpeningElement(loc, null, Collections.emptyList(), false);
+	}
+
+	private Node convertJsxClosingFragment(JsonObject node, SourceLocation loc) {
+		return new JSXClosingElement(loc, null);
+	}
+
+	private Node convertJsxOpeningElement(JsonObject node, SourceLocation loc) throws ParseError {
+		JsonElement attributes = node.get("attributes");
+		List<IJSXAttribute> convertedAttributes;
+		if (attributes.isJsonArray()) {
+			convertedAttributes = convertNodes(attributes.getAsJsonArray());
+		} else {
+			convertedAttributes = convertChildren(attributes.getAsJsonObject(), "properties");
+		}
+		return new JSXOpeningElement(loc, convertJSXName(convertChild(node, "tagName")), convertedAttributes, hasChild(node, "selfClosing"));
+	}
+
+	private Node convertJsxSelfClosingElement(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		node.remove("kind");
+		node.add("kind", syntaxKinds.get("JsxOpeningElement"));
+		node.add("selfClosing", new JsonPrimitive(true));
+		return new JSXElement(loc, (JSXOpeningElement) convertNode(node), new ArrayList<>(), null);
+	}
+
+	private Node convertJsxSpreadAttribute(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new JSXSpreadAttribute(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertJsxText(JsonObject node, SourceLocation loc) {
+		String text;
+		if (hasChild(node, "text"))
+			text = node.get("text").getAsString();
+		else
+			text = "";
+		return new Literal(loc, TokenType.string, text);
+	}
+
+	private Node convertLabeledStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new LabeledStatement(loc, convertChild(node, "label"), convertChild(node, "statement"));
+	}
+
+	private Node convertLiteralType(JsonObject node, SourceLocation loc) throws ParseError {
+		return convertChild(node, "literal");
+	}
+
+	private Node convertMappedType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new MappedTypeExpr(loc, convertChild(node, "typeParameter"), convertChildAsType(node, "type"));
+	}
+
+	private Node convertMetaProperty(JsonObject node, SourceLocation loc) throws ParseError {
+		Position metaStart = loc.getStart();
+		Position metaEnd = new Position(metaStart.getLine(), metaStart.getColumn()+3, metaStart.getOffset()+3);
+		SourceLocation metaLoc = new SourceLocation("new", metaStart, metaEnd);
+		Identifier meta = new Identifier(metaLoc, "new");
+		return new MetaProperty(loc, meta, convertChild(node, "name"));
+	}
+
+	private Node convertMethodDeclaration(JsonObject node, String kind,
+			SourceLocation loc) throws ParseError {
+		int flags = getMemberModifierKeywords(node);
+		if (hasComputedName(node)) {
+			flags |= DeclarationFlags.computed;
+		}
+		if (kind.equals("MethodSignature")) {
+			flags |= DeclarationFlags.abstract_;
+		}
+		MethodDefinition.Kind methodKind;
+		if ("GetAccessor".equals(kind))
+			methodKind = Kind.GET;
+		else if ("SetAccessor".equals(kind))
+			methodKind = Kind.SET;
+		else
+			methodKind = Kind.METHOD;
+		FunctionExpression method = convertImplicitFunction(node, loc);
+		MethodDefinition methodDefinition = new MethodDefinition(loc, flags, methodKind, convertChild(node, "name"), method);
+		if (node.has("decorators")) {
+			methodDefinition.addDecorators(convertChildren(node, "decorators"));
+			advanceUntilAfter(loc, methodDefinition.getDecorators());
+		}
+		return methodDefinition;
+	}
+
+	private FunctionExpression convertImplicitFunction(JsonObject node, SourceLocation loc) throws ParseError {
+		ITypeExpression returnType = convertChildAsType(node, "type");
+		List<ITypeExpression> paramTypes = convertParameterTypes(node);
+		List<DecoratorList> paramDecorators = convertParameterDecorators(node);
+		List<TypeParameter> typeParameters = convertChildrenNotNull(node, "typeParameters");
+		FunctionExpression method = new FunctionExpression(loc, null, convertParameters(node), convertChild(node, "body"),
+				hasChild(node, "asteriskToken"), hasModifier(node, "AsyncKeyword"), typeParameters, paramTypes,
+				paramDecorators, returnType, null);
+		attachSymbolInformation(method, node);
+		return method;
+	}
+
+	private Node convertNamespaceDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		Node nameNode = convertChild(node, "name");
+		List<Statement> body;
+		Statement b = convertChild(node, "body");
+		if (b instanceof BlockStatement) {
+			body = ((BlockStatement) b).getBody();
+		} else {
+			body = new ArrayList<>();
+			body.add(b);
+		}
+		if (nameNode instanceof Literal) {
+			// Declaration of form: declare module "X" {...}
+			return new ExternalModuleDeclaration(loc, (Literal) nameNode, body);
+		}
+		if (hasFlag(node, "GlobalAugmentation")) {
+			// Declaration of form: declare global {...}
+			return new GlobalAugmentationDeclaration(loc, body);
+		}
+		Identifier name = (Identifier) nameNode;
+		boolean isInstantiated = false;
+		for (Statement stmt : body) {
+			isInstantiated = isInstantiated || isInstantiatingNamespaceMember(stmt);
+		}
+		boolean hasDeclareKeyword = hasModifier(node, "DeclareKeyword");
+		NamespaceDeclaration decl = new NamespaceDeclaration(loc, name, body, isInstantiated, hasDeclareKeyword);
+		attachSymbolInformation(decl, node);
+		if (hasFlag(node, "NestedNamespace")) {
+			// In a nested namespace declaration `namespace A.B`, the nested namespace `B`
+			// is implicitly exported.
+			return new ExportNamedDeclaration(loc, decl, new ArrayList<>(), null);
+		} else {
+			return fixExports(loc, decl);
+		}
+	}
+
+	private boolean isInstantiatingNamespaceMember(Statement node) {
+		if (node instanceof ExportNamedDeclaration) {
+			// Ignore 'export' modifiers.
+			return isInstantiatingNamespaceMember(((ExportNamedDeclaration) node).getDeclaration());
+		}
+		if (node instanceof NamespaceDeclaration) {
+			return ((NamespaceDeclaration) node).isInstantiated();
+		}
+		if (node instanceof InterfaceDeclaration) {
+			return false;
+		}
+		if (node instanceof TypeAliasDeclaration) {
+			return false;
+		}
+		return true;
+	}
+
+	private Node convertModuleBlock(JsonObject node, SourceLocation loc) throws ParseError {
+		return convertBlock(node, loc);
+	}
+
+	private Node convertNamespaceExportDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ExportAsNamespaceDeclaration(loc, convertChild(node, "name"));
+	}
+
+	private Node convertNamespaceImport(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ImportNamespaceSpecifier(loc, convertChild(node, "name"));
+	}
+
+	private Node convertNewExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		List<Expression> arguments;
+		if (hasChild(node, "arguments"))
+			arguments = convertChildren(node, "arguments");
+		else
+			arguments = new ArrayList<>();
+		List<ITypeExpression> typeArguments = convertChildrenAsTypes(node, "typeArguments");
+		NewExpression result = new NewExpression(loc, convertChild(node, "expression"), typeArguments, arguments);
+		attachResolvedSignature(result, node);
+		return result;
+	}
+
+	private Node convertNonNullExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new NonNullAssertion(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertNoSubstitutionTemplateLiteral(JsonObject node,
+			SourceLocation loc) {
+		List<TemplateElement> quasis = new ArrayList<>();
+		TemplateElement elm = new TemplateElement(loc, node.get("text").getAsString(), loc.getSource().substring(1, loc.getSource().length()-1), true);
+		quasis.add(elm);
+		attachStaticType(elm, node);
+		return new TemplateLiteral(loc, new ArrayList<>(), quasis);
+	}
+
+	private Node convertNullKeyword(SourceLocation loc) {
+		return new Literal(loc, TokenType._null, null);
+	}
+
+	private Node convertObjectBindingPattern(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		List<Property> properties = new ArrayList<>();
+		for (JsonElement elt : node.get("elements").getAsJsonArray()) {
+			JsonObject element = elt.getAsJsonObject();
+			SourceLocation eltLoc = getSourceLocation(element);
+			Expression propKey = hasChild(element, "propertyName") ? convertChild(element, "propertyName") : convertChild(element, "name");
+			Expression propVal;
+			if (hasChild(element, "dotDotDotToken")) {
+				propVal = new RestElement(eltLoc, propKey);
+			} else if (hasChild(element, "initializer")) {
+				propVal = new AssignmentPattern(eltLoc, "=", propKey, convertChild(element, "initializer"));
+			} else {
+				propVal = convertChild(element, "name");
+			}
+			properties.add(new Property(eltLoc, propKey, propVal, "init", hasComputedName(element, "propertyName"), false));
+		}
+		return new ObjectPattern(loc, properties);
+	}
+
+	private Node convertObjectLiteralExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		List<Property> properties;
+		properties = new ArrayList<Property>();
+		for (INode e : convertChildren(node, "properties")) {
+			if (e instanceof SpreadElement) {
+				properties.add(new Property(e.getLoc(), null, (Expression)e, Property.Kind.INIT.name(), false, false));
+			} else if (e instanceof MethodDefinition) {
+				MethodDefinition md = (MethodDefinition) e;
+				Property.Kind kind = Property.Kind.INIT;
+				if (md.getKind() == Kind.GET) {
+					kind = Property.Kind.GET;
+				} else if (md.getKind() == Kind.SET) {
+					kind = Property.Kind.SET;
+				}
+				properties.add(new Property(e.getLoc(), md.getKey(), md.getValue(), kind.name(), md.isComputed(), true));
+			} else {
+				properties.add((Property)e);
+			}
+		}
+		return new ObjectExpression(loc, properties);
+	}
+
+	private Node convertOmittedExpression() {
+		return null;
+	}
+
+	private Node convertOptionalType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new OptionalTypeExpr(loc, convertChild(node, "type"));
+	}
+
+	private ITypeExpression asType(Node node) {
+		return node instanceof ITypeExpression ? (ITypeExpression) node : null;
+	}
+
+	private List<ITypeExpression> convertChildrenAsTypes(JsonObject node, String child) throws ParseError {
+		List<ITypeExpression> result = new ArrayList<>();
+		JsonElement children = node.get(child);
+		if (!(children instanceof JsonArray))
+			return result;
+		for (JsonElement childNode : children.getAsJsonArray()) {
+			ITypeExpression type = asType(convertNode(childNode.getAsJsonObject()));
+			if (type != null)
+				result.add(type);
+		}
+		return result;
+	}
+
+	private ITypeExpression convertChildAsType(JsonObject node, String child) throws ParseError {
+		return asType(convertChild(node, child));
+	}
+
+	/**
+	 * True if the given node is an Identifier node.
+	 */
+	private boolean isIdentifier(JsonElement node) {
+		if (node == null)
+			return false;
+		JsonObject object = node.getAsJsonObject();
+		if (object == null)
+			return false;
+		String kind = getKind(object);
+		return kind == null || kind.equals("Identifier");
+	}
+
+	/**
+	 * Returns true if this is the JSON object for the special "this" parameter.
+	 * <p>
+	 * It should be given the JSON object of kind "Parameter".
+	 */
+	private boolean isThisParameter(JsonElement parameter) {
+		JsonObject name = parameter.getAsJsonObject().get("name").getAsJsonObject();
+		return isIdentifier(name) && getIdentifierText(name).equals("this");
+	}
+
+	/**
+	 * Returns the parameters of the given function, omitting the special "this"
+	 * parameter, which we do not consider to be a proper parameter.
+	 */
+	private Iterable<JsonElement> getProperParameters(JsonObject function) {
+		if (!function.has("parameters"))
+			return Collections.emptyList();
+		JsonArray parameters = function.get("parameters").getAsJsonArray();
+		if (parameters.size() > 0 && isThisParameter(parameters.get(0))) {
+			return CollectionUtil.skipIterable(parameters, 1);
+		} else {
+			return parameters;
+		}
+	}
+
+	/**
+	 * Returns the special "this" parameter of the given function, or {@code null}
+	 * if the function does not declare a "this" parameter.
+	 */
+	private ITypeExpression convertThisParameterType(JsonObject function) throws ParseError {
+		if (!function.has("parameters"))
+			return null;
+		JsonArray parameters = function.get("parameters").getAsJsonArray();
+		if (parameters.size() > 0 && isThisParameter(parameters.get(0))) {
+			return convertChildAsType(parameters.get(0).getAsJsonObject(), "type");
+		} else {
+			return null;
+		}
+	}
+
+	private List<Expression> convertParameters(JsonObject function) throws ParseError {
+		return convertNodes(getProperParameters(function), true);
+	}
+
+	private List<ITypeExpression> convertParameterTypes(JsonObject function) throws ParseError {
+		List<ITypeExpression> result = new ArrayList<>();
+		for (JsonElement param : getProperParameters(function)) {
+			result.add(convertChildAsType(param.getAsJsonObject(), "type"));
+		}
+		return result;
+	}
+
+	private List<FieldDefinition> convertParameterFields(JsonObject function) throws ParseError {
+		List<FieldDefinition> result = new ArrayList<>();
+		int index = -1;
+		for (JsonElement paramElm : getProperParameters(function)) {
+			++index;
+			JsonObject param = paramElm.getAsJsonObject();
+			int flags = getMemberModifierKeywords(param);
+			if (flags == DeclarationFlags.none) {
+				// If there are no flags, this is not a field parameter.
+				continue;
+			}
+			// We generate a synthetic field node, but do not copy any of the AST nodes from
+			// the parameter. The QL library overrides accessors to the name and type
+			// annotation to return those from the corresponding parameter.
+			SourceLocation loc = getSourceLocation(param);
+			if (param.has("initializer")) {
+				// Do not include the default parameter value in the source range for the field.
+				SourceLocation endLoc;
+				if (param.has("type")) {
+					endLoc = getSourceLocation(param.get("type").getAsJsonObject());
+				} else {
+					endLoc = getSourceLocation(param.get("name").getAsJsonObject());
+				}
+				loc.setEnd(endLoc.getEnd());
+				loc.setSource(source.substring(loc.getStart().getOffset(), loc.getEnd().getOffset()));
+			}
+			FieldDefinition field = new FieldDefinition(loc, flags, null, null, null, index);
+			result.add(field);
+		}
+		return result;
+	}
+
+	private Node convertParameter(JsonObject node, SourceLocation loc) throws ParseError {
+		// Note that type annotations are not extracted in this function, but in a
+		// separate pass in convertParameterTypes above.
+		Expression name = convertChild(node, "name", "Identifier");
+		if (hasChild(node, "dotDotDotToken"))
+			return new RestElement(loc, name);
+		if (hasChild(node, "initializer"))
+			return new AssignmentPattern(loc, "=", name, convertChild(node, "initializer"));
+		return name;
+	}
+
+	private Node convertParenthesizedExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new ParenthesizedExpression(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertParenthesizedType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ParenthesizedTypeExpr(loc, convertChildAsType(node, "type"));
+	}
+
+	private Node convertPostfixUnaryExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		String operator = getOperator(node);
+		return new UpdateExpression(loc, operator, convertChild(node, "operand"), false);
+	}
+
+	private Node convertPrefixUnaryExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		String operator = getOperator(node);
+		if ("++".equals(operator) || "--".equals(operator))
+			return new UpdateExpression(loc, operator, convertChild(node, "operand"), true);
+		else
+			return new UnaryExpression(loc, operator, convertChild(node, "operand"), true);
+	}
+
+	private String getOperator(JsonObject node) throws ParseError {
+		int operatorId = node.get("operator").getAsInt();
+		switch (syntaxKindMap.get(operatorId)) {
+		case "PlusPlusToken":
+			return "++";
+		case "MinusMinusToken":
+			return "--";
+		case "PlusToken":
+			return "+";
+		case "MinusToken":
+			return "-";
+		case "TildeToken":
+			return "~";
+		case "ExclamationToken":
+			return "!";
+		default:
+			throw new ParseError("Unsupported TypeScript operator " + operatorId, getSourceLocation(node).getStart());
+		}
+	}
+
+	private Node convertPropertyAccessExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new MemberExpression(loc, convertChild(node, "expression"), convertChild(node, "name"), false);
+	}
+
+	private Node convertPropertyAssignment(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new Property(loc, convertChild(node, "name"), convertChild(node, "initializer"), "init", hasComputedName(node), false);
+	}
+
+	private Node convertPropertyDeclaration(JsonObject node, String kind,
+			SourceLocation loc) throws ParseError {
+		int flags = getMemberModifierKeywords(node);
+		if (hasComputedName(node)) {
+			flags |= DeclarationFlags.computed;
+		}
+		if (kind.equals("PropertySignature")) {
+			flags |= DeclarationFlags.abstract_;
+		}
+		if (node.get("questionToken") != null) {
+			flags |= DeclarationFlags.optional;
+		}
+		if (node.get("exclamationToken") != null) {
+			flags |= DeclarationFlags.definiteAssignmentAssertion;
+		}
+		FieldDefinition fieldDefinition = new FieldDefinition(loc, flags, convertChild(node, "name"),
+				convertChild(node, "initializer"), convertChildAsType(node, "type"));
+		if (node.has("decorators")) {
+			fieldDefinition.addDecorators(convertChildren(node, "decorators"));
+			advanceUntilAfter(loc, fieldDefinition.getDecorators());
+		}
+		return fieldDefinition;
+	}
+
+	private Node convertRegularExpressionLiteral(SourceLocation loc) {
+		return new Literal(loc, TokenType.regexp, null);
+	}
+
+	private Node convertRestType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new RestTypeExpr(loc, convertChild(node, "type"));
+	}
+
+	private Node convertQualifiedName(JsonObject node, SourceLocation loc) throws ParseError {
+		MemberExpression expr = new MemberExpression(loc, convertChild(node, "left"), convertChild(node, "right"), false);
+		attachSymbolInformation(expr, node);
+		return expr;
+	}
+
+	private Node convertReturnStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new ReturnStatement(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertSemicolonClassElement() {
+		return null;
+	}
+
+	private Node convertSourceFile(JsonObject node, SourceLocation loc) throws ParseError {
+		List<Statement> statements = convertNodes(node.get("statements").getAsJsonArray());
+		Program program = new Program(loc, statements, "module");
+		attachSymbolInformation(program, node);
+		return program;
+	}
+
+	private Node convertShorthandPropertyAssignment(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new Property(loc, convertChild(node, "name"), convertChild(node, "name"), "init", false, false);
+	}
+
+	private Node convertSpreadElement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new SpreadElement(loc, convertChild(node, "expression"));
+	}
+
+	private Node convertStringLiteral(JsonObject node, SourceLocation loc) {
+		return new Literal(loc, TokenType.string, node.get("text").getAsString());
+	}
+
+	private Node convertSuperKeyword(SourceLocation loc) {
+		return new Super(loc);
+	}
+
+	private Node convertSwitchStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		JsonObject caseBlock = node.get("caseBlock").getAsJsonObject();
+		return new SwitchStatement(loc, convertChild(node, "expression"), convertChildren(caseBlock, "clauses"));
+	}
+
+	private Node convertTaggedTemplateExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new TaggedTemplateExpression(loc, convertChild(node, "tag"), convertChild(node, "template"));
+	}
+
+	private Node convertTemplateExpression(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		List<TemplateElement> quasis;
+		List<Expression> expressions = new ArrayList<>();
+		quasis = new ArrayList<>();
+		quasis.add(convertChild(node, "head"));
+		for (JsonElement elt : node.get("templateSpans").getAsJsonArray()) {
+			JsonObject templateSpan = (JsonObject) elt;
+			expressions.add(convertChild(templateSpan, "expression"));
+			quasis.add(convertChild(templateSpan, "literal"));
+		}
+		return new TemplateLiteral(loc, expressions, quasis);
+	}
+
+	private Node convertTemplateElement(JsonObject node, String kind,
+			SourceLocation loc) {
+		boolean tail = "TemplateTail".equals(kind);
+		if (loc.getSource().startsWith("`") || loc.getSource().startsWith("}")) {
+			loc.setSource(loc.getSource().substring(1));
+			Position start = loc.getStart();
+			loc.setStart(new Position(start.getLine(), start.getColumn()+1, start.getColumn()+1));
+		}
+		if (loc.getSource().endsWith("${")) {
+			loc.setSource(loc.getSource().substring(0, loc.getSource().length()-2));
+			Position end = loc.getEnd();
+			loc.setEnd(new Position(end.getLine(), end.getColumn()-2, end.getColumn()-2));
+		}
+		if (loc.getSource().endsWith("`")) {
+			loc.setSource(loc.getSource().substring(0, loc.getSource().length()-1));
+			Position end = loc.getEnd();
+			loc.setEnd(new Position(end.getLine(), end.getColumn()-1, end.getColumn()-1));
+		}
+		return new TemplateElement(loc, node.get("text").getAsString(), loc.getSource(), tail);
+	}
+
+	private Node convertThisKeyword(SourceLocation loc) {
+		return new ThisExpression(loc);
+	}
+
+	private Node convertThrowStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		Expression expr = convertChild(node, "expression");
+		if (expr == null)
+			return convertEmptyStatement(loc);
+		return new ThrowStatement(loc, expr);
+	}
+
+	private Node convertTrueKeyword(SourceLocation loc) {
+		return new Literal(loc, TokenType._true, true);
+	}
+
+	private Node convertTryStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TryStatement(loc, convertChild(node, "tryBlock"), convertChild(node, "catchClause"), null,
+				convertChild(node, "finallyBlock"));
+	}
+
+	private Node convertTupleType(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TupleTypeExpr(loc, convertChildrenAsTypes(node, "elementTypes"));
+	}
+
+	private Node convertTypeAliasDeclaration(JsonObject node, SourceLocation loc) throws ParseError {
+		TypeAliasDeclaration typeAlias = new TypeAliasDeclaration(loc, convertChild(node, "name"),
+				convertChildrenNotNull(node, "typeParameters"), convertChildAsType(node, "type"));
+		attachSymbolInformation(typeAlias, node);
+		return fixExports(loc, typeAlias);
+	}
+
+	private Node convertTypeAssertionExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TypeAssertion(loc, convertChild(node, "expression"), convertChildAsType(node, "type"), false);
+	}
+
+	private Node convertTypeLiteral(JsonObject obj, SourceLocation loc) throws ParseError {
+		return new InterfaceTypeExpr(loc, convertChildren(obj, "members"));
+	}
+
+	private Node convertTypeOfExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new UnaryExpression(loc, "typeof", convertChild(node, "expression"), true);
+	}
+
+	private Node convertTypeOperator(JsonObject node, SourceLocation loc) throws ParseError {
+		String operator = syntaxKinds.get("" + node.get("operator").getAsInt()).getAsString();
+		if (operator.equals("KeyOfKeyword")) {
+			return new KeyofTypeExpr(loc, convertChildAsType(node, "type"));
+		}
+		if (operator.equals("UniqueKeyword")) {
+			return new KeywordTypeExpr(loc, "unique symbol");
+		}
+		throw new ParseError("Unsupported TypeScript syntax", loc.getStart());
+	}
+
+	private Node convertTypeParameter(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TypeParameter(loc, convertChild(node, "name"), convertChildAsType(node, "constraint"),
+				convertChildAsType(node, "default"));
+	}
+
+	private Node convertTypePredicate(JsonObject node, SourceLocation loc) throws ParseError {
+		return new IsTypeExpr(loc, convertChildAsType(node, "parameterName"), convertChildAsType(node, "type"));
+	}
+
+	private Node convertTypeReference(JsonObject node, SourceLocation loc) throws ParseError {
+		ITypeExpression typeName = convertChild(node, "typeName");
+		List<ITypeExpression> typeArguments = convertChildrenAsTypes(node, "typeArguments");
+		if (typeArguments.isEmpty())
+			return (Node) typeName;
+		return new GenericTypeExpr(loc, typeName, typeArguments);
+	}
+
+	private Node convertTypeQuery(JsonObject node, SourceLocation loc) throws ParseError {
+		return new TypeofTypeExpr(loc, convertChildAsType(node, "exprName"));
+	}
+
+	private Node convertVariableDeclaration(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new VariableDeclarator(loc, convertChild(node, "name"), convertChild(node, "initializer"),
+				convertChildAsType(node, "type"), DeclarationFlags.getDefiniteAssignmentAssertion(node.get("exclamationToken") != null));
+	}
+
+	private Node convertVariableDeclarationList(JsonObject node,
+			SourceLocation loc) throws ParseError {
+		return new VariableDeclaration(loc, getDeclarationKind(node), convertVariableDeclarations(node), false);
+	}
+
+	private List<VariableDeclarator> convertVariableDeclarations(JsonObject node) throws ParseError {
+		if (node.get("declarations").getAsJsonArray().size() == 0)
+			throw new ParseError("Unexpected token", getSourceLocation(node).getEnd());
+		return convertChildren(node, "declarations");
+	}
+
+	private Node convertVariableStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		JsonObject declarationList = node.get("declarationList").getAsJsonObject();
+		String declarationKind = getDeclarationKind(declarationList);
+		List<VariableDeclarator> declarations = convertVariableDeclarations(declarationList);
+		boolean hasDeclareKeyword = hasModifier(node, "DeclareKeyword");
+		VariableDeclaration vd = new VariableDeclaration(loc, declarationKind, declarations, hasDeclareKeyword);
+		return fixExports(loc, vd);
+	}
+
+	private Node convertVoidExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new UnaryExpression(loc, "void", convertChild(node, "expression"), true);
+	}
+
+	private Node convertWhileStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new WhileStatement(loc, convertChild(node, "expression"), convertChild(node, "statement"));
+	}
+
+	private Node convertWithStatement(JsonObject node, SourceLocation loc) throws ParseError {
+		return new WithStatement(loc, convertChild(node, "expression"), convertChild(node, "statement"));
+	}
+
+	private Node convertYieldExpression(JsonObject node, SourceLocation loc) throws ParseError {
+		return new YieldExpression(loc, convertChild(node, "expression"), hasChild(node, "asteriskToken"));
+	}
+
+	/**
+	 * Convert {@code e} to an lvalue expression, replacing {@link ArrayExpression} with
+	 * {@link ArrayPattern}, {@link AssignmentExpression} with {@link AssignmentPattern},
+	 * {@link ObjectExpression} with {@link ObjectPattern} and {@link SpreadElement} with
+	 * {@link RestElement}.
+	 */
+	private Expression convertLValue(Expression e) {
+		if (e == null)
+			return null;
+
+		SourceLocation loc = e.getLoc();
+		if (e instanceof ArrayExpression) {
+			List<Expression> elts = new ArrayList<Expression>();
+			for (Expression elt : ((ArrayExpression) e).getElements())
+				elts.add(convertLValue(elt));
+			return new ArrayPattern(loc, elts);
+		}
+		if (e instanceof AssignmentExpression) {
+			AssignmentExpression a = (AssignmentExpression)e;
+			return new AssignmentPattern(loc, a.getOperator(), convertLValue(a.getLeft()), a.getRight());
+		}
+		if (e instanceof ObjectExpression) {
+			List<Property> props = new ArrayList<Property>();
+			for (Property prop : ((ObjectExpression) e).getProperties()) {
+				Expression key = prop.getKey();
+				Expression rawValue = prop.getRawValue();
+				String kind = prop.getKind().name();
+				boolean isComputed = prop.isComputed();
+				boolean isMethod = prop.isMethod();
+				props.add(new Property(prop.getLoc(), key, convertLValue(rawValue), kind, isComputed, isMethod));
+			}
+			return new ObjectPattern(loc, props);
+		}
+		if (e instanceof ParenthesizedExpression)
+			return new ParenthesizedExpression(loc, convertLValue(((ParenthesizedExpression) e).getExpression()));
+		if (e instanceof SpreadElement)
+			return new RestElement(e.getLoc(), convertLValue(((SpreadElement) e).getArgument()));
+		return e;
+	}
+
+	/**
+	 * Convert {@code e} to an {@link IJSXName}.
+	 */
+	private IJSXName convertJSXName(Expression e) {
+		if (e instanceof Identifier)
+			return new JSXIdentifier(e.getLoc(), ((Identifier) e).getName());
+		if (e instanceof MemberExpression) {
+			MemberExpression me = (MemberExpression) e;
+			return new JSXMemberExpression(e.getLoc(), convertJSXName(me.getObject()), (JSXIdentifier) convertJSXName(me.getProperty()));
+		}
+		if (e instanceof ThisExpression)
+			return new JSXIdentifier(e.getLoc(), "this");
+		return (IJSXName) e;
+	}
+
+	/**
+	 * Check whether {@code decl} has an {@code export} annotation, and if so wrap
+	 * it inside an {@link ExportDeclaration}.
+	 * <p>
+	 * If the declared statement has decorators, the {@code loc} should first be
+	 * advanced past these using {@link #advanceUntilAfter}.
+	 */
+	private Node fixExports(SourceLocation loc, Statement decl) {
+		Matcher m = EXPORT_DECL_START.matcher(loc.getSource());
+		if (m.find()) {
+			String skipped = m.group(0);
+			SourceLocation outerLoc = new SourceLocation(loc.getSource(), loc.getStart(), loc.getEnd());
+			advance(loc, skipped);
+			// capture group 1 is `default`, if present
+			if (m.group(1) == null)
+				return new ExportNamedDeclaration(outerLoc, decl, new ArrayList<>(), null);
+			return new ExportDefaultDeclaration(outerLoc, decl);
+		}
+		return decl;
+	}
+
+	/**
+	 * Holds if the {@code name} property of the given AST node is a computed
+	 * property name.
+	 */
+	private boolean hasComputedName(JsonObject node) {
+		return hasComputedName(node, "name");
+	}
+
+	/**
+	 * Holds if the given property of the given AST node is a computed property name.
+	 */
+	private boolean hasComputedName(JsonObject node, String propName) {
+		return hasKind(node.get(propName), "ComputedPropertyName");
+	}
+
+	/**
+	 * Update the start position and source text of {@code loc} by skipping over the string
+	 * {@code skipped}.
+	 */
+	private void advance(SourceLocation loc, String skipped) {
+		loc.setStart(advance(loc.getStart(), skipped));
+		loc.setSource(loc.getSource().substring(skipped.length()));
+	}
+
+	/**
+	 * Update the start position of @{code loc} by skipping over the given children
+	 * and any following whitespace and comments, provided they are contained in the
+	 * source location.
+	 */
+	private void advanceUntilAfter(SourceLocation loc, List<? extends INode> nodes) {
+		if (nodes.isEmpty())
+			return;
+		INode last = nodes.get(nodes.size() - 1);
+		int offset = last.getLoc().getEnd().getOffset() - loc.getStart().getOffset();
+		if (offset <= 0)
+			return;
+		offset += matchWhitespace(last.getLoc().getEnd().getOffset()).length();
+		if (offset >= loc.getSource().length())
+			return;
+		loc.setStart(advance(loc.getStart(), loc.getSource().substring(0, offset)));
+		loc.setSource(loc.getSource().substring(offset));
+	}
+
+	/**
+	 * Get the longest sequence of whitespace or comment characters starting at the
+	 * given offset.
+	 */
+	private String matchWhitespace(int offset) {
+		Matcher m = WHITESPACE.matcher(source.substring(offset));
+		m.find();
+		return m.group(0);
+	}
+
+	/**
+	 * Create a position corresponding to {@code pos}, but updated by skipping over the
+	 * string {@code skipped}.
+	 */
+	private Position advance(Position pos, String skipped) {
+		int innerStartOffset = pos.getOffset() + skipped.length();
+		int innerStartLine = pos.getLine(), innerStartColumn = pos.getColumn();
+		Matcher m = LINE_TERMINATOR.matcher(skipped);
+		int lastEnd = 0;
+		while (m.find()) {
+			++innerStartLine;
+			innerStartColumn = 1;
+			lastEnd = m.end();
+		}
+		innerStartColumn += skipped.length() - lastEnd;
+		if (lastEnd > 0)
+			--innerStartColumn;
+		Position innerStart = new Position(innerStartLine, innerStartColumn, innerStartOffset);
+		return innerStart;
+	}
+
+	/**
+	 * Get the source location of the given AST node.
+	 */
+	private SourceLocation getSourceLocation(JsonObject node) {
+		Position start = getPosition(node.get("$pos").getAsJsonObject(), true);
+		Position end = getPosition(node.get("$end").getAsJsonObject(), false);
+		int startOffset = start.getOffset();
+		int endOffset = end.getOffset();
+		if (startOffset > endOffset)
+			startOffset = endOffset;
+		if (endOffset > source.length())
+			endOffset = source.length();
+		return new SourceLocation(source.substring(startOffset, endOffset), start, end);
+	}
+
+	/**
+	 * Convert the given position object into a {@link Position}.
+	 * For start positions, we need to skip over whitespace, which is included in
+	 * the positions reported by the TypeScript compiler.
+	 */
+	private Position getPosition(JsonObject pos, boolean isStart) {
+		int line = pos.get("line").getAsInt() + 1;
+		int column = pos.get("character").getAsInt();
+		int offset = pos.get("$offset").getAsInt();
+		if (isStart) {
+			while (offset < source.length() && Character.isWhitespace(source.charAt(offset)))
+				++offset;
+		}
+		return new Position(line, column, offset);
+	}
+
+	private Iterable<JsonElement> getModifiers(JsonObject node) {
+		JsonElement mods = node.get("modifiers");
+		if (!(mods instanceof JsonArray))
+			return Collections.emptyList();
+		return (JsonArray) mods;
+	}
+
+	/**
+	 * Returns a specific modifier from the given node (or <tt>null</tt> if absent),
+	 * as defined by its <tt>modifiers</tt> property and the <tt>kind</tt> property
+	 * of the modifier AST node.
+	 */
+	private JsonObject getModifier(JsonObject node, String modKind) {
+		for (JsonElement mod : getModifiers(node))
+			if (mod instanceof JsonObject)
+				if (hasKind((JsonObject) mod, modKind))
+					return (JsonObject) mod;
+		return null;
+	}
+
+	/**
+	 * Check whether a node has a particular modifier, as defined by its
+	 * <tt>modifiers</tt> property and the <tt>kind</tt> property of the modifier
+	 * AST node.
+	 */
+	private boolean hasModifier(JsonObject node, String modKind) {
+		return getModifier(node, modKind) != null;
+	}
+
+	private int getDeclarationModifierFromKeyword(String kind) {
+		switch (kind) {
+		case "AbstractKeyword":
+			return DeclarationFlags.abstract_;
+		case "StaticKeyword":
+			return DeclarationFlags.static_;
+		case "ReadonlyKeyword":
+			return DeclarationFlags.readonly;
+		case "PublicKeyword":
+			return DeclarationFlags.public_;
+		case "PrivateKeyword":
+			return DeclarationFlags.private_;
+		case "ProtectedKeyword":
+			return DeclarationFlags.protected_;
+		default:
+			return DeclarationFlags.none;
+		}
+	}
+
+	/**
+	 * Returns the set of member flags corresponding to the modifier keywords
+	 * present on the given node.
+	 */
+	private int getMemberModifierKeywords(JsonObject node) {
+		int flags = DeclarationFlags.none;
+		for (JsonElement mod : getModifiers(node)) {
+			if (mod instanceof JsonObject) {
+				JsonObject modObject = (JsonObject) mod;
+				flags |= getDeclarationModifierFromKeyword(getKind(modObject));
+			}
+		}
+		return flags;
+	}
+
+	/**
+	 * Check whether a node has a particular flag, as defined by its <tt>flags</tt>
+	 * property and the <tt>ts.NodeFlags</tt> in enum.
+	 */
+	private boolean hasFlag(JsonObject node, String flagName) {
+		JsonElement flagDescriptor = this.nodeFlags.get(flagName);
+		if (flagDescriptor == null) {
+			throw new RuntimeException("Incompatible version of TypeScript installed. Missing node flag " + flagName);
+		}
+		int flagId = flagDescriptor.getAsInt();
+		JsonElement flags = node.get("flags");
+		if (flags instanceof JsonPrimitive) {
+			return (flags.getAsInt() & flagId) != 0;
+		}
+		return false;
+	}
+
+	/**
+	 * Gets the numeric value of the syntax kind enum with the given name.
+	 */
+	private int getSyntaxKind(String syntaxKind) {
+		JsonElement descriptor = this.syntaxKinds.get(syntaxKind);
+		if (descriptor == null) {
+			throw new RuntimeException("Incompatible version of TypeScript installed. Missing syntax kind " + syntaxKind);
+		}
+		return descriptor.getAsInt();
+	}
+
+	/**
+	 * Check whether a node has a child with a given name.
+	 */
+	private boolean hasChild(JsonObject node, String prop) {
+		if (!node.has(prop))
+			return false;
+		return !(node.get(prop) instanceof JsonNull);
+	}
+
+	/**
+	 * Returns an iterator over the elements of the given child array, or an empty
+	 * iterator if the given child is not an array.
+	 */
+	private Iterable<JsonElement> getChildIterable(JsonObject node, String child) {
+		JsonElement elt = node.get(child);
+		if (!(elt instanceof JsonArray))
+			return Collections.emptyList();
+		return (JsonArray) elt;
+	}
+
+	/**
+	 * Gets the kind of the given node.
+	 */
+	private String getKind(JsonElement node) {
+		if (node instanceof JsonObject) {
+			JsonElement kind = ((JsonObject) node).get("kind");
+			if (kind instanceof JsonPrimitive && ((JsonPrimitive) kind).isNumber())
+				return syntaxKindMap.get(kind.getAsInt());
+		}
+		return null;
+	}
+
+	/**
+	 * Holds if the given node has the given kind.
+	 */
+	private boolean hasKind(JsonElement node, String kind) {
+		return kind.equals(getKind(node));
+	}
+
+	/**
+	 * Gets the declaration kind of the given node, which is one of {@code "var"},
+	 * {@code "let"} or {@code "const"}.
+	 */
+	private String getDeclarationKind(JsonObject declarationList) {
+		return declarationList.get("$declarationKind").getAsString();
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/js/parser/TypeScriptParser.java b/javascript/extractor/src/com/semmle/js/parser/TypeScriptParser.java
new file mode 100644
index 00000000000..186b1804d4e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/js/parser/TypeScriptParser.java
@@ -0,0 +1,413 @@
+package com.semmle.js.parser;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.ByteArrayOutputStream;
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+import java.lang.ProcessBuilder.Redirect;
+import java.util.ArrayList;
+import java.util.List;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonPrimitive;
+import com.semmle.js.parser.JSParser.Result;
+import com.semmle.ts.extractor.TypeTable;
+import com.semmle.util.data.StringUtil;
+import com.semmle.util.data.UnitParser;
+import com.semmle.util.exception.CatastrophicError;
+import com.semmle.util.exception.Exceptions;
+import com.semmle.util.exception.InterruptedError;
+import com.semmle.util.exception.ResourceError;
+import com.semmle.util.exception.UserError;
+import com.semmle.util.io.WholeIO;
+import com.semmle.util.logging.LogbackUtils;
+import com.semmle.util.process.AbstractProcessBuilder;
+import com.semmle.util.process.Builder;
+import com.semmle.util.process.Env;
+
+import ch.qos.logback.classic.Level;
+
+/**
+ * The Java half of our wrapper for invoking the TypeScript parser.
+ *
+ * The Node.js half of the wrapper is expected to live at
+ * {@code $SEMMLE_DIST/tools/typescript-parser-wrapper/main.js}; non-standard
+ * locations can be configured using the property {@link #PARSER_WRAPPER_PATH_ENV_VAR}.
+ *
+ * The script is started upon parsing the first TypeScript file and then is
+ * kept running in the background, passing it requests for parsing files and
+ * getting JSON-encoded ASTs as responses.
+ */
+public class TypeScriptParser {
+	/**
+	 * An environment variable that can be set to indicate the location of the
+	 * TypeScript parser wrapper when running without SEMMLE_DIST.
+	 */
+	public static final String PARSER_WRAPPER_PATH_ENV_VAR = "SEMMLE_TYPESCRIPT_PARSER_WRAPPER";
+
+	/**
+	 * An environment variable that can be set to specify a timeout to use when
+	 * verifying the TypeScript installation, in milliseconds. Default is 10000.
+	 */
+	public static final String TYPESCRIPT_TIMEOUT_VAR = "SEMMLE_TYPESCRIPT_TIMEOUT";
+
+	/**
+	 * An environment variable (without the <tt>SEMMLE_</tt> or <tt>LGTM_</tt>
+	 * prefix), that can be set to indicate the maximum heap space usable by the
+	 * Node.js process, in addition to its "reserve memory".
+	 * <p>
+	 * Defaults to 1.0 GB (for a total heap space of 1.4 GB by default).
+	 */
+	public static final String TYPESCRIPT_RAM_SUFFIX = "TYPESCRIPT_RAM";
+
+	/**
+	 * An environment variable (without the <tt>SEMMLE_</tt> or <tt>LGTM_</tt>
+	 * prefix), that can be set to indicate the amount of heap space the Node.js
+	 * process should reserve for extracting individual files.
+	 * <p>
+	 * When less than this amount of memory is available, the TypeScript compiler
+	 * instance is restarted to free space.
+	 * <p>
+	 * Defaults to 400 MB (for a total heap space of 1.4 GB by default).
+	 */
+	public static final String TYPESCRIPT_RAM_RESERVE_SUFFIX = "TYPESCRIPT_RAM_RESERVE";
+
+	/** The Node.js parser wrapper process, if it has been started already. */
+	private Process parserWrapperProcess;
+	private String parserWrapperCommand;
+
+	/** Streams for communicating with the Node.js parser wrapper process. */
+	private BufferedWriter toParserWrapper;
+	private BufferedReader fromParserWrapper;
+
+	private String nodeJsVersionString;
+
+	/**
+	 * If non-zero, we use this instead of relying on the corresponding environment
+	 * variable.
+	 */
+	private int typescriptRam = 0;
+
+	/**
+	 * Sets the amount of RAM to allocate to the TypeScript compiler.s
+	 */
+	public void setTypescriptRam(int megabytes) {
+		this.typescriptRam = megabytes;
+	}
+
+	/**
+	 * Verifies that Node.js and TypeScript are installed and throws an exception
+	 * otherwise.
+	 *
+	 * @param verbose
+	 *            if true, log the version strings and NODE_PATH.
+	 */
+	public void verifyInstallation(boolean verbose) {
+		verifyNodeInstallation();
+		if (verbose) {
+			System.out.println("Found Node.js version: " + nodeJsVersionString);
+		}
+	}
+
+	/**
+	 * Checks that Node.js is installed and can be run and returns its version
+	 * string.
+	 */
+	public String verifyNodeInstallation() {
+		if (nodeJsVersionString != null)
+			return nodeJsVersionString;
+
+		ByteArrayOutputStream out = new ByteArrayOutputStream();
+		ByteArrayOutputStream err = new ByteArrayOutputStream();
+		Builder b = new Builder(out, err, getParserWrapper().getParentFile(), "node", "--version");
+		b.expectFailure(); // We want to do our own logging in case of an error.
+
+		int timeout = Env.systemEnv().getInt(TYPESCRIPT_TIMEOUT_VAR, 10000);
+		try {
+			int r = b.execute(timeout);
+			String stdout = new String(out.toByteArray());
+			String stderr = new String(err.toByteArray());
+			if (r != 0 || stdout.length() == 0) {
+				throw new CatastrophicError("Could not start Node.js. It is required for TypeScript extraction.\n" + stderr);
+			}
+			return nodeJsVersionString = stdout;
+		} catch (InterruptedError e) {
+			Exceptions.ignore(e, "Exception details are not important.");
+			throw new CatastrophicError("Could not start Node.js (timed out after " + (timeout / 1000) + "s).");
+		} catch (ResourceError e) {
+			// In case 'node' is not found, the process builder converts the IOException
+			// into a ResourceError.
+			Exceptions.ignore(e, "We rewrite this into a UserError");
+			throw new UserError("Could not start Node.js. It is required for TypeScript extraction."
+					+ "\nPlease install Node.js and ensure 'node' is on the PATH.");
+		}
+	}
+
+	private static int getMegabyteCountFromPrefixedEnv(String suffix, int defaultValue) {
+		String envVar = "SEMMLE_" + suffix;
+		String value = Env.systemEnv().get(envVar);
+		if (value == null || value.length() == 0) {
+			envVar = "LGTM_" + suffix;
+			value = Env.systemEnv().get(envVar);
+		}
+		if (value == null || value.length() == 0) {
+			return defaultValue;
+		}
+		Integer amount = UnitParser.parseOpt(value, UnitParser.MEGABYTES);
+		if (amount == null) {
+			throw new UserError("Invalid value for " + envVar + ": '" + value + "'");
+		}
+		return amount;
+	}
+
+	/**
+	 * Start the Node.js parser wrapper process.
+	 */
+	private void setupParserWrapper() {
+		verifyNodeInstallation();
+
+		int mainMemoryMb = typescriptRam != 0 ? typescriptRam : getMegabyteCountFromPrefixedEnv(TYPESCRIPT_RAM_SUFFIX, 1000);
+		int reserveMemoryMb = getMegabyteCountFromPrefixedEnv(TYPESCRIPT_RAM_RESERVE_SUFFIX, 400);
+
+		File parserWrapper = getParserWrapper();
+		List<String> cmd = new ArrayList<>();
+		cmd.add("node");
+		cmd.add("--max_old_space_size=" + (mainMemoryMb + reserveMemoryMb));
+		cmd.add(parserWrapper.getAbsolutePath());
+		ProcessBuilder pb = new ProcessBuilder(cmd);
+		parserWrapperCommand = StringUtil.glue(" ", cmd);
+		pb.environment().put("SEMMLE_TYPESCRIPT_MEMORY_THRESHOLD", "" + mainMemoryMb);
+
+		try {
+			pb.redirectError(Redirect.INHERIT); // Forward stderr to our own stderr.
+			parserWrapperProcess = pb.start();
+			OutputStream os = parserWrapperProcess.getOutputStream();
+			OutputStreamWriter osw = new OutputStreamWriter(os, "UTF-8");
+			toParserWrapper = new BufferedWriter(osw);
+			InputStream is = parserWrapperProcess.getInputStream();
+			InputStreamReader isr = new InputStreamReader(is, "UTF-8");
+			fromParserWrapper = new BufferedReader(isr);
+		} catch (IOException e) {
+			throw new CatastrophicError("Could not start TypeScript parser wrapper "
+					+ "(command: ." + parserWrapperCommand + ")", e);
+		}
+	}
+
+	/**
+	 * Get the location of the Node.js parser wrapper script.
+	 */
+	private File getParserWrapper() {
+		File parserWrapper;
+		LogbackUtils.getLogger(AbstractProcessBuilder.class).setLevel(Level.INFO);
+		String explicitPath = Env.systemEnv().get(PARSER_WRAPPER_PATH_ENV_VAR);
+		String semmleDistVar = Env.systemEnv().get(Env.Var.SEMMLE_DIST.name());
+		if (semmleDistVar != null && !semmleDistVar.isEmpty()) {
+			parserWrapper = new File(semmleDistVar, "tools/typescript-parser-wrapper/main.js");
+		} else if (explicitPath != null) {
+			parserWrapper = new File(explicitPath);
+		} else {
+			throw new CatastrophicError("Could not find TypeScript parser: " + Env.Var.SEMMLE_DIST.name() + " is not set.");
+		}
+		if (!parserWrapper.isFile())
+			throw new ResourceError("Could not find TypeScript parser: " +
+					parserWrapper + " does not exist.");
+		return parserWrapper;
+	}
+
+	/**
+	 * Send a {@code request} to the Node.js parser wrapper process, and return
+	 * the response it replies with.
+	 */
+	private JsonObject talkToParserWrapper(JsonObject request) {
+		if (parserWrapperProcess == null)
+			setupParserWrapper();
+
+		if (!parserWrapperProcess.isAlive()) {
+			int exitCode = 0;
+			try {
+				exitCode = parserWrapperProcess.waitFor();
+			} catch (InterruptedException e) {
+				Exceptions.ignore(e, "This is for diagnostic purposes only.");
+			}
+			String err = new WholeIO().strictReadString(parserWrapperProcess.getErrorStream());
+			throw new CatastrophicError("TypeScript parser wrapper terminated with exit code " +
+					exitCode + "; stderr: " + err);
+		}
+
+		String response = null;
+		try {
+			toParserWrapper.write(request.toString());
+			toParserWrapper.newLine();
+			toParserWrapper.flush();
+			response = fromParserWrapper.readLine();
+			if (response == null)
+				throw new CatastrophicError(
+						"Could not communicate with TypeScript parser wrapper "
+						+ "(command: " + parserWrapperCommand + ").");
+			return new JsonParser().parse(response).getAsJsonObject();
+		} catch (IOException e) {
+			throw new CatastrophicError(
+					"Could not communicate with TypeScript parser wrapper "
+					+ "(command: ." + parserWrapperCommand + ").", e);
+		} catch (JsonParseException | IllegalStateException e) {
+			throw new CatastrophicError(
+					"TypeScript parser wrapper sent unexpected response: " +
+					response + " (command: " + parserWrapperCommand + ").", e);
+		}
+	}
+
+	/**
+	 * Returns the AST for a given source file.
+	 * <p>
+	 * Type information will be available if the file is part of a currently open
+	 * project, although this is not yet implemented.
+	 * <p>
+	 * If the file is not part of a project, only syntactic information will be
+	 * extracted.
+	 */
+	public Result parse(File sourceFile, String source) {
+		JsonObject request = new JsonObject();
+		request.add("command", new JsonPrimitive("parse"));
+		request.add("filename", new JsonPrimitive(sourceFile.getAbsolutePath()));
+		JsonObject response = talkToParserWrapper(request);
+		try {
+			checkResponseType(response, "ast");
+			JsonObject nodeFlags = response.get("nodeFlags").getAsJsonObject();
+			JsonObject syntaxKinds = response.get("syntaxKinds").getAsJsonObject();
+			JsonObject ast = response.get("ast").getAsJsonObject();
+			return new TypeScriptASTConverter(nodeFlags, syntaxKinds).convertAST(ast, source);
+		} catch (IllegalStateException e) {
+			throw new CatastrophicError("TypeScript parser wrapper sent unexpected response: " +
+					response, e);
+		}
+	}
+
+	/**
+	 * Opens a new project based on a tsconfig.json file. The compiler will analyze
+	 * all files in the project.
+	 * <p>
+	 * Call {@link #parse} to access individual files in the project.
+	 * <p>
+	 * Only one project should be opened at once.
+	 */
+	public ParsedProject openProject(File tsConfigFile) {
+		JsonObject request = new JsonObject();
+		request.add("command", new JsonPrimitive("open-project"));
+		request.add("tsConfig", new JsonPrimitive(tsConfigFile.getPath()));
+		JsonObject response = talkToParserWrapper(request);
+		try {
+			checkResponseType(response, "project-opened");
+			ParsedProject project = new ParsedProject(tsConfigFile);
+			JsonArray filesJson = response.get("files").getAsJsonArray();
+			for (JsonElement elm : filesJson) {
+				project.addSourceFile(new File(elm.getAsString()));
+			}
+			return project;
+		} catch (IllegalStateException e) {
+			throw new CatastrophicError("TypeScript parser wrapper sent unexpected response: " + response, e);
+		}
+	}
+
+	/**
+	 * Closes a project previously opened.
+	 * <p>
+	 * This main purpose is to free heap space in the Node.js process.
+	 */
+	public void closeProject(File tsConfigFile) {
+		JsonObject request = new JsonObject();
+		request.add("command", new JsonPrimitive("close-project"));
+		request.add("tsConfig", new JsonPrimitive(tsConfigFile.getPath()));
+		JsonObject response = talkToParserWrapper(request);
+		try {
+			checkResponseType(response, "project-closed");
+		} catch (IllegalStateException e) {
+			throw new CatastrophicError("TypeScript parser wrapper sent unexpected response: " + response, e);
+		}
+	}
+
+	public TypeTable getTypeTable() {
+		JsonObject request = new JsonObject();
+		request.add("command", new JsonPrimitive("get-type-table"));
+		JsonObject response = talkToParserWrapper(request);
+		try {
+			checkResponseType(response, "type-table");
+			return new TypeTable(response.get("typeTable").getAsJsonObject());
+		} catch (IllegalStateException e) {
+			throw new CatastrophicError("TypeScript parser wrapper sent unexpected response: " + response, e);
+		}
+	}
+
+	/**
+	 * Closes any open project, and in general, brings the TypeScript wrapper to a
+	 * fresh state as if it had just been restarted.
+	 * <p>
+	 * This is to ensure tests are isolated but without the cost of restarting the
+	 * Node.js process.
+	 */
+	public void reset() {
+		try {
+			resetInternal();
+		} catch (CatastrophicError e) {
+			Exceptions.ignore(e, "Restarting process instead");
+			killProcess();
+		}
+	}
+
+	private void resetInternal() {
+		if (parserWrapperProcess == null) {
+			return; // Ignore reset requests if the process is not running.
+		}
+		JsonObject request = new JsonObject();
+		request.add("command", new JsonPrimitive("reset"));
+		JsonObject response = talkToParserWrapper(request);
+		try {
+			checkResponseType(response, "reset-done");
+		} catch (IllegalStateException e) {
+			throw new CatastrophicError("TypeScript parser wrapper sent unexpected response: " + response, e);
+		}
+	}
+
+	private void checkResponseType(JsonObject response, String type) {
+		JsonElement typeElm = response.get("type");
+		// Report unexpected response types as an internal error.
+		if (typeElm == null || !typeElm.getAsString().equals(type)) {
+			throw new CatastrophicError("TypeScript parser sent unexpected response: " + response + ". Expected " + type);
+		}
+	}
+
+	private void tryClose(Closeable stream) {
+		if (stream == null)
+			return;
+		try {
+			stream.close();
+		} catch (IOException e) {
+			Exceptions.ignore(e, "Closing stream");
+		}
+	}
+
+	/**
+	 * Forcibly closes the Node.js process.
+	 *
+	 * A new process will be started the next time a request is made.
+	 */
+	public void killProcess() {
+		if (parserWrapperProcess != null) {
+			parserWrapperProcess.destroy();
+			parserWrapperProcess = null;
+		}
+		tryClose(toParserWrapper);
+		tryClose(fromParserWrapper);
+		toParserWrapper = null;
+		fromParserWrapper = null;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ArrayTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/ArrayTypeExpr.java
new file mode 100644
index 00000000000..56817707c14
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ArrayTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An array type, such as <tt>number[]</tt>, or in general <tt>T[]</tt> where
+ * <tt>T</tt> is a type.
+ */
+public class ArrayTypeExpr extends TypeExpression {
+	private final ITypeExpression elementType;
+
+	public ArrayTypeExpr(SourceLocation loc, ITypeExpression elementType) {
+		super("ArrayTypeExpr", loc);
+		this.elementType = elementType;
+	}
+
+	public ITypeExpression getElementType() {
+		return elementType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ConditionalTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/ConditionalTypeExpr.java
new file mode 100644
index 00000000000..44643139e52
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ConditionalTypeExpr.java
@@ -0,0 +1,44 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A conditional type annotation, such as <tt>T extends any[] ? A : B</tt>.
+ */
+public class ConditionalTypeExpr extends TypeExpression {
+	private ITypeExpression checkType;
+	private ITypeExpression extendsType;
+	private ITypeExpression trueType;
+	private ITypeExpression falseType;
+
+	public ConditionalTypeExpr(SourceLocation loc, ITypeExpression checkType, ITypeExpression extendsType,
+			ITypeExpression trueType, ITypeExpression falseType) {
+		super("ConditionalTypeExpr", loc);
+		this.checkType = checkType;
+		this.extendsType = extendsType;
+		this.trueType = trueType;
+		this.falseType = falseType;
+	}
+
+	public ITypeExpression getCheckType() {
+		return checkType;
+	}
+
+	public ITypeExpression getExtendsType() {
+		return extendsType;
+	}
+
+	public ITypeExpression getTrueType() {
+		return trueType;
+	}
+
+	public ITypeExpression getFalseType() {
+		return falseType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/DecoratorList.java b/javascript/extractor/src/com/semmle/ts/ast/DecoratorList.java
new file mode 100644
index 00000000000..5c50102085a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/DecoratorList.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class DecoratorList extends Expression {
+	private final List<Decorator> decorators;
+
+	public DecoratorList(SourceLocation loc, List<Decorator> decorators) {
+		super("DecoratorList", loc);
+		this.decorators = decorators;
+	}
+
+	public List<Decorator> getDecorators() {
+		return decorators;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/EnumDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/EnumDeclaration.java
new file mode 100644
index 00000000000..2d6c528cb55
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/EnumDeclaration.java
@@ -0,0 +1,63 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Decorator;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+public class EnumDeclaration extends Statement implements INodeWithSymbol {
+	private final boolean isConst;
+	private final boolean hasDeclareKeyword;
+	private final List<Decorator> decorators;
+	private final Identifier id;
+	private List<EnumMember> members;
+	private int typeSymbol = -1;
+
+	public EnumDeclaration(SourceLocation loc, boolean isConst, boolean hasDeclareKeyword, List<Decorator> decorators, Identifier id,
+			List<EnumMember> members) {
+		super("EnumDeclaration", loc);
+		this.isConst = isConst;
+		this.hasDeclareKeyword = hasDeclareKeyword;
+		this.decorators = decorators;
+		this.id = id;
+		this.members = members;
+	}
+
+	public boolean isConst() {
+		return isConst;
+	}
+
+	public boolean hasDeclareKeyword() {
+		return hasDeclareKeyword;
+	}
+
+	public List<Decorator> getDecorators() {
+		return decorators;
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	public List<EnumMember> getMembers() {
+		return members;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public int getSymbol() {
+		return typeSymbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.typeSymbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/EnumMember.java b/javascript/extractor/src/com/semmle/ts/ast/EnumMember.java
new file mode 100644
index 00000000000..59ccdf12807
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/EnumMember.java
@@ -0,0 +1,46 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class EnumMember extends Node implements INodeWithSymbol {
+	private final Identifier id;
+	private final Expression initializer;
+	private int typeSymbol = -1;
+
+	public EnumMember(SourceLocation loc, Identifier id, Expression initializer) {
+		super("EnumMember", loc);
+		this.id = id;
+		this.initializer = initializer;
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	/**
+	 * Returns the initializer expression, or {@code null} if this enum member has
+	 * no explicit initializer.
+	 */
+	public Expression getInitializer() {
+		return initializer;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public int getSymbol() {
+		return typeSymbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.typeSymbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ExportAsNamespaceDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/ExportAsNamespaceDeclaration.java
new file mode 100644
index 00000000000..19d0b612fbb
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ExportAsNamespaceDeclaration.java
@@ -0,0 +1,28 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A statement of form <tt>export as namespace X</tt> where <tt>X</tt> is an
+ * identifier.
+ */
+public class ExportAsNamespaceDeclaration extends Statement {
+	private Identifier id;
+
+	public ExportAsNamespaceDeclaration(SourceLocation loc, Identifier id) {
+		super("ExportAsNamespaceDeclaration", loc);
+		this.id = id;
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ExportWholeDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/ExportWholeDeclaration.java
new file mode 100644
index 00000000000..5e5ce4308c8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ExportWholeDeclaration.java
@@ -0,0 +1,24 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+public class ExportWholeDeclaration extends Statement {
+	private final Expression rhs;
+
+	public ExportWholeDeclaration(SourceLocation loc, Expression rhs) {
+		super("ExportWholeDeclaration", loc);
+		this.rhs = rhs;
+	}
+
+	public Expression getRhs() {
+		return rhs;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ExpressionWithTypeArguments.java b/javascript/extractor/src/com/semmle/ts/ast/ExpressionWithTypeArguments.java
new file mode 100644
index 00000000000..117d4cbf669
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ExpressionWithTypeArguments.java
@@ -0,0 +1,42 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An expression with type arguments, occurring as the super-class expression of
+ * a class. For example:
+ *
+ * <pre>
+ * class StringList extends List&lt;string&gt; {}
+ * </pre>
+ *
+ * Above, <tt>List</tt> is a concrete expression whereas its type argument is a
+ * type.
+ */
+public class ExpressionWithTypeArguments extends Expression {
+	private final Expression expression;
+	private final List<ITypeExpression> typeArguments;
+
+	public ExpressionWithTypeArguments(SourceLocation loc, Expression expression, List<ITypeExpression> typeArguments) {
+		super("ExpressionWithTypeArguments", loc);
+		this.expression = expression;
+		this.typeArguments = typeArguments;
+	}
+
+	public Expression getExpression() {
+		return expression;
+	}
+
+	public List<ITypeExpression> getTypeArguments() {
+		return typeArguments;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleDeclaration.java
new file mode 100644
index 00000000000..15d04ae2f7a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleDeclaration.java
@@ -0,0 +1,35 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Literal;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A statement of form <tt>declare module "X" {...}</tt>.
+ */
+public class ExternalModuleDeclaration extends Statement {
+	private final Literal name;
+	private final List<Statement> body;
+
+	public ExternalModuleDeclaration(SourceLocation loc, Literal name, List<Statement> body) {
+		super("ExternalModuleDeclaration", loc);
+		this.name = name;
+		this.body = body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public Literal getName() {
+		return name;
+	}
+
+	public List<Statement> getBody() {
+		return body;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleReference.java b/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleReference.java
new file mode 100644
index 00000000000..8819efc5216
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ExternalModuleReference.java
@@ -0,0 +1,24 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class ExternalModuleReference extends Expression {
+	private final Expression expression;
+
+	public ExternalModuleReference(SourceLocation loc, Expression expression) {
+		super("ExternalModuleReference", loc);
+		this.expression = expression;
+	}
+
+	public Expression getExpression() {
+		return expression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/FunctionTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/FunctionTypeExpr.java
new file mode 100644
index 00000000000..67556f20de2
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/FunctionTypeExpr.java
@@ -0,0 +1,29 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.FunctionExpression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+public class FunctionTypeExpr extends TypeExpression {
+	private final FunctionExpression function;
+	private final boolean isConstructor;
+
+	public FunctionTypeExpr(SourceLocation loc, FunctionExpression function, boolean isConstructor) {
+		super("FunctionTypeExpr", loc);
+		this.function = function;
+		this.isConstructor = isConstructor;
+	}
+
+	public FunctionExpression getFunction() {
+		return function;
+	}
+
+	public boolean isConstructor() {
+		return isConstructor;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/GenericTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/GenericTypeExpr.java
new file mode 100644
index 00000000000..f7945a4e889
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/GenericTypeExpr.java
@@ -0,0 +1,33 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An instantiation of a named type, such as <tt>Array&lt;number&gt;</tt>
+ */
+public class GenericTypeExpr extends TypeExpression {
+	final private ITypeExpression typeName; // Always Identifier or MemberExpression
+	final private List<ITypeExpression> typeArguments;
+
+	public GenericTypeExpr(SourceLocation loc, ITypeExpression typeName, List<ITypeExpression> typeArguments) {
+		super("GenericTypeExpr", loc);
+		this.typeName = typeName;
+		this.typeArguments = typeArguments;
+	}
+
+	public ITypeExpression getTypeName() {
+		return typeName;
+	}
+
+	public List<ITypeExpression> getTypeArguments() {
+		return typeArguments;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/GlobalAugmentationDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/GlobalAugmentationDeclaration.java
new file mode 100644
index 00000000000..dc2ec3a3e57
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/GlobalAugmentationDeclaration.java
@@ -0,0 +1,28 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A statement of form: <tt>declare global { ... }</tt>
+ */
+public class GlobalAugmentationDeclaration extends Statement {
+	private final List<Statement> body;
+
+	public GlobalAugmentationDeclaration(SourceLocation loc, List<Statement> body) {
+		super("GlobalAugmentationDeclaration", loc);
+		this.body = body;
+	}
+
+	public List<Statement> getBody() {
+		return body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/INodeWithSymbol.java b/javascript/extractor/src/com/semmle/ts/ast/INodeWithSymbol.java
new file mode 100644
index 00000000000..858f71b0a39
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/INodeWithSymbol.java
@@ -0,0 +1,17 @@
+package com.semmle.ts.ast;
+
+/**
+ * An AST node that is associated with a TypeScript compiler symbol.
+ *
+ * This can be the symbol for the type defined by this node, of it this is a
+ * module top-level, the symbol for that module.
+ */
+public interface INodeWithSymbol {
+	/**
+	 * Gets a number identifying the symbol associated with this AST node, or
+	 * <tt>-1</tt> if there is no such symbol.
+	 */
+	int getSymbol();
+
+	void setSymbol(int symbol);
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ITypeExpression.java b/javascript/extractor/src/com/semmle/ts/ast/ITypeExpression.java
new file mode 100644
index 00000000000..2f711f449d6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ITypeExpression.java
@@ -0,0 +1,15 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.INode;
+import com.semmle.js.ast.Literal;
+
+/**
+ * An AST node that may occur as part of a TypeScript type annotation.
+ * <p>
+ * At the QL level, expressions and type annotations are completely separate. In
+ * the extractor, however, some expressions such as {@link Literal} type may
+ * occur in a type annotation because the TypeScript AST does not distinguish
+ * <tt>null</tt> literals from the <tt>null</tt> type.
+ */
+public interface ITypeExpression extends INode, ITypedAstNode {
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ITypedAstNode.java b/javascript/extractor/src/com/semmle/ts/ast/ITypedAstNode.java
new file mode 100644
index 00000000000..b360d292c86
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ITypedAstNode.java
@@ -0,0 +1,17 @@
+package com.semmle.ts.ast;
+
+/**
+ * An AST node with an associated static type.
+ */
+public interface ITypedAstNode {
+	/**
+	 * Gets the static type of this node as determined by the TypeScript compiler,
+	 * or -1 if no type was determined.
+	 * <p>
+	 * The ID refers to a type in a table that is extracted on a per-project basis,
+	 * and the meaning of this type ID is not available at the AST level.
+	 */
+	int getStaticTypeId();
+
+	void setStaticTypeId(int id);
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ImportTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/ImportTypeExpr.java
new file mode 100644
index 00000000000..4f2e14522d0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ImportTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An import type such as in <tt>import("http").ServerRequest</tt>.
+ */
+public class ImportTypeExpr extends Expression implements ITypeExpression {
+	private final ITypeExpression path;
+
+	public ImportTypeExpr(SourceLocation loc, ITypeExpression path) {
+		super("ImportTypeExpr", loc);
+		this.path = path;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public ITypeExpression getPath() {
+		return path;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ImportWholeDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/ImportWholeDeclaration.java
new file mode 100644
index 00000000000..81745f1158c
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ImportWholeDeclaration.java
@@ -0,0 +1,34 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An import of form <tt>import a = E</tt>.
+ */
+public class ImportWholeDeclaration extends Statement {
+	private final Identifier lhs;
+	private final Expression rhs;
+
+	public ImportWholeDeclaration(SourceLocation loc, Identifier lhs, Expression rhs) {
+		super("ImportWholeDeclaration", loc);
+		this.lhs = lhs;
+		this.rhs = rhs;
+	}
+
+	public Identifier getLhs() {
+		return lhs;
+	}
+
+	public Expression getRhs() {
+		return rhs;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/IndexedAccessTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/IndexedAccessTypeExpr.java
new file mode 100644
index 00000000000..d6f723da2e8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/IndexedAccessTypeExpr.java
@@ -0,0 +1,31 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type of form <tt>T[K]</tt> where <tt>T</tt> and <tt>K</tt> are types.
+ */
+public class IndexedAccessTypeExpr extends TypeExpression {
+	private final ITypeExpression objectType;
+	private final ITypeExpression indexType;
+
+	public IndexedAccessTypeExpr(SourceLocation loc, ITypeExpression objectType, ITypeExpression indexType) {
+		super("IndexedAccessTypeExpr", loc);
+		this.objectType = objectType;
+		this.indexType = indexType;
+	}
+
+	public ITypeExpression getObjectType() {
+		return objectType;
+	}
+
+	public ITypeExpression getIndexType() {
+		return indexType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/InferTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/InferTypeExpr.java
new file mode 100644
index 00000000000..be59885e183
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/InferTypeExpr.java
@@ -0,0 +1,25 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type annotation of form <tt>infer R</tt>
+ */
+public class InferTypeExpr extends TypeExpression {
+	private TypeParameter typeParameter;
+
+	public InferTypeExpr(SourceLocation loc, TypeParameter typeParameter) {
+		super("InferTypeExpr", loc);
+		this.typeParameter = typeParameter;
+	}
+
+	public TypeParameter getTypeParameter() {
+		return typeParameter;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/InterfaceDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/InterfaceDeclaration.java
new file mode 100644
index 00000000000..6ecb30a44c9
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/InterfaceDeclaration.java
@@ -0,0 +1,65 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A TypeScript interface declaration.
+ */
+public class InterfaceDeclaration extends Statement implements INodeWithSymbol {
+	private final Identifier name;
+	private final List<TypeParameter> typeParameters;
+	private final List<ITypeExpression> superInterfaces;
+	private final List<MemberDefinition<?>> body;
+	private int typeSymbol = -1;
+
+	public InterfaceDeclaration(SourceLocation loc, Identifier name, List<TypeParameter> typeParameters,
+			List<ITypeExpression> superInterfaces,
+			List<MemberDefinition<?>> body) {
+		super("InterfaceDeclaration", loc);
+		this.name = name;
+		this.typeParameters = typeParameters;
+		this.superInterfaces = superInterfaces;
+		this.body = body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public Identifier getName() {
+		return name;
+	}
+
+	public List<TypeParameter> getTypeParameters() {
+		return typeParameters;
+	}
+
+	public boolean hasTypeParameters() {
+		return !typeParameters.isEmpty();
+	}
+
+	public List<MemberDefinition<?>> getBody() {
+		return body;
+	}
+
+	public List<ITypeExpression> getSuperInterfaces() {
+		return superInterfaces;
+	}
+
+	@Override
+	public int getSymbol() {
+		return typeSymbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.typeSymbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/InterfaceTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/InterfaceTypeExpr.java
new file mode 100644
index 00000000000..09a38c869b3
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/InterfaceTypeExpr.java
@@ -0,0 +1,28 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.MemberDefinition;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An inline interface type, such as <tt>{x: number; y: number}</tt>.
+ */
+public class InterfaceTypeExpr extends TypeExpression {
+	private final List<MemberDefinition<?>> body;
+
+	public InterfaceTypeExpr(SourceLocation loc, List<MemberDefinition<?>> body) {
+		super("InterfaceTypeExpr", loc);
+		this.body = body;
+	}
+
+	public List<MemberDefinition<?>> getBody() {
+		return body;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/IntersectionTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/IntersectionTypeExpr.java
new file mode 100644
index 00000000000..05a794908ea
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/IntersectionTypeExpr.java
@@ -0,0 +1,29 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An intersection type such as <tt>T&amp;S</tt>, denoting the intersection of
+ * type <tt>T</tt> and type <tt>S</tt>.
+ */
+public class IntersectionTypeExpr extends TypeExpression {
+	private final List<ITypeExpression> elementTypes;
+
+	public IntersectionTypeExpr(SourceLocation loc, List<ITypeExpression> elementTypes) {
+		super("IntersectionTypeExpr", loc);
+		this.elementTypes = elementTypes;
+	}
+
+	/** The members of the intersection type; always contains at least two types. */
+	public List<ITypeExpression> getElementTypes() {
+		return elementTypes;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/IsTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/IsTypeExpr.java
new file mode 100644
index 00000000000..69b7d67dd16
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/IsTypeExpr.java
@@ -0,0 +1,32 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type of form <tt>E is T</tt> where <tt>E</tt> is a parameter name or
+ * <tt>this</tt> and <tt>T</tt> is a type.
+ */
+public class IsTypeExpr extends TypeExpression {
+	private final ITypeExpression left; // Always Identifier or KeywordTypeExpr (in case of 'this')
+	private final ITypeExpression right;
+
+	public IsTypeExpr(SourceLocation loc, ITypeExpression left, ITypeExpression right) {
+		super("IsTypeExpr", loc);
+		this.left = left;
+		this.right = right;
+	}
+
+	public ITypeExpression getLeft() {
+		return left;
+	}
+
+	public ITypeExpression getRight() {
+		return right;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/KeyofTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/KeyofTypeExpr.java
new file mode 100644
index 00000000000..ecd2e51d631
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/KeyofTypeExpr.java
@@ -0,0 +1,25 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type of form <tt>keyof T</tt> where <tt>T</tt> is a type.
+ */
+public class KeyofTypeExpr extends TypeExpression {
+	private final ITypeExpression elementType;
+
+	public KeyofTypeExpr(SourceLocation loc, ITypeExpression elementType) {
+		super("KeyofTypeExpr", loc);
+		this.elementType = elementType;
+	}
+
+	public ITypeExpression getElementType() {
+		return elementType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/KeywordTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/KeywordTypeExpr.java
new file mode 100644
index 00000000000..de0ab2a82bd
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/KeywordTypeExpr.java
@@ -0,0 +1,32 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * One of the TypeScript keyword types, such as <tt>string</tt> or <tt>any</tt>.
+ * <p>
+ * This includes the type <tt>unique symbol</tt> which consists of two keywords
+ * but is represented as a keyword single type expression.
+ * <p>
+ * At the QL level, the <tt>null</tt> type is also a keyword type. In the
+ * extractor, however, this is represented by a Literal, because the TypeScript
+ * AST does not distinguish those two uses of <tt>null</tt>.
+ */
+public class KeywordTypeExpr extends TypeExpression {
+	private final String keyword;
+
+	public KeywordTypeExpr(SourceLocation loc, String keyword) {
+		super("KeywordTypeExpr", loc);
+		this.keyword = keyword;
+	}
+
+	public String getKeyword() {
+		return keyword;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/MappedTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/MappedTypeExpr.java
new file mode 100644
index 00000000000..0744ef3eaef
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/MappedTypeExpr.java
@@ -0,0 +1,35 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type of form <tt>{ [K in C]: T }</tt>, where <tt>T</tt> is a type that may
+ * refer to <tt>K</tt>.
+ * <p>
+ * As with the TypeScript AST, the <tt>K in C</tt> part is represented as a type
+ * parameter with <tt>C</tt> as its upper bound.
+ */
+public class MappedTypeExpr extends TypeExpression {
+	private final TypeParameter typeParameter;
+	private final ITypeExpression elementType;
+
+	public MappedTypeExpr(SourceLocation loc, TypeParameter typeParameter, ITypeExpression elementType) {
+		super("MappedTypeExpr", loc);
+		this.typeParameter = typeParameter;
+		this.elementType = elementType;
+	}
+
+	public TypeParameter getTypeParameter() {
+		return typeParameter;
+	}
+
+	public ITypeExpression getElementType() {
+		return elementType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/NamespaceDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/NamespaceDeclaration.java
new file mode 100644
index 00000000000..a36d6addd43
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/NamespaceDeclaration.java
@@ -0,0 +1,62 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+public class NamespaceDeclaration extends Statement implements INodeWithSymbol {
+	private final Identifier name;
+	private final List<Statement> body;
+	private final boolean isInstantiated;
+	private final boolean hasDeclareKeyword;
+	private int symbol = -1;
+
+	public NamespaceDeclaration(SourceLocation loc, Identifier name, List<Statement> body, boolean isInstantiated, boolean hasDeclareKeyword) {
+		super("NamespaceDeclaration", loc);
+		this.name = name;
+		this.body = body;
+		this.isInstantiated = isInstantiated;
+		this.hasDeclareKeyword = hasDeclareKeyword;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	public Identifier getName() {
+		return name;
+	}
+
+	public List<Statement> getBody() {
+		return body;
+	}
+
+	/**
+	 * Returns whether this is an instantiated namespace.
+	 *
+	 * Non-instantiated namespaces only contain interface types, type aliases, and
+	 * other non-instantiated namespaces.  The TypeScript compiler does not emit
+	 * code for non-instantiated namespaces.
+	 */
+	public boolean isInstantiated() {
+		return isInstantiated;
+	}
+
+	public boolean hasDeclareKeyword() {
+		return hasDeclareKeyword;
+	}
+
+	@Override
+	public int getSymbol() {
+		return this.symbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.symbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/NonNullAssertion.java b/javascript/extractor/src/com/semmle/ts/ast/NonNullAssertion.java
new file mode 100644
index 00000000000..3cb53f4e59a
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/NonNullAssertion.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A TypeScript expression of form <tt>E!</tt>, asserting that <tt>E</tt> is not null.
+ */
+public class NonNullAssertion extends Expression {
+	private final Expression expression;
+
+	public NonNullAssertion(SourceLocation loc, Expression expression) {
+		super("NonNullAssertion", loc);
+		this.expression = expression;
+	}
+
+	public Expression getExpression() {
+		return expression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/OptionalTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/OptionalTypeExpr.java
new file mode 100644
index 00000000000..483f3870912
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/OptionalTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An optional type in a tuple type, such as <tt>number?</tt> in
+ * <tt>[string, number?]</tt>.
+ */
+public class OptionalTypeExpr extends TypeExpression {
+	private final ITypeExpression elementType;
+
+	public OptionalTypeExpr(SourceLocation loc, ITypeExpression elementType) {
+		super("OptionalTypeExpr", loc);
+		this.elementType = elementType;
+	}
+
+	public ITypeExpression getElementType() {
+		return elementType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/ParenthesizedTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/ParenthesizedTypeExpr.java
new file mode 100644
index 00000000000..f9fc1fe6bb0
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/ParenthesizedTypeExpr.java
@@ -0,0 +1,25 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type expression in parentheses, such as <tt>("foo" | "bar")</tt>.
+ */
+public class ParenthesizedTypeExpr extends TypeExpression {
+	private final ITypeExpression elementType;
+
+	public ParenthesizedTypeExpr(SourceLocation loc, ITypeExpression elementType) {
+		super("ParenthesizedTypeExpr", loc);
+		this.elementType = elementType;
+	}
+
+	public ITypeExpression getElementType() {
+		return elementType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/RestTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/RestTypeExpr.java
new file mode 100644
index 00000000000..1c0618eea9e
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/RestTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A rest type in a tuple type, such as <tt>number[]</tt> in
+ * <tt>[string, ...number[]]</tt>.
+ */
+public class RestTypeExpr extends TypeExpression {
+	private final ITypeExpression arrayType;
+
+	public RestTypeExpr(SourceLocation loc, ITypeExpression arrayType) {
+		super("RestTypeExpr", loc);
+		this.arrayType = arrayType;
+	}
+
+	public ITypeExpression getArrayType() {
+		return arrayType;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TupleTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/TupleTypeExpr.java
new file mode 100644
index 00000000000..6f8b0a7a8e6
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TupleTypeExpr.java
@@ -0,0 +1,27 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A tuple type, such as <tt>[number, string]</tt>.
+ */
+public class TupleTypeExpr extends TypeExpression {
+	private final List<ITypeExpression> elementTypes;
+
+	public TupleTypeExpr(SourceLocation loc, List<ITypeExpression> elementTypes) {
+		super("TupleTypeExpr", loc);
+		this.elementTypes = elementTypes;
+	}
+
+	public List<ITypeExpression> getElementTypes() {
+		return elementTypes;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TypeAliasDeclaration.java b/javascript/extractor/src/com/semmle/ts/ast/TypeAliasDeclaration.java
new file mode 100644
index 00000000000..2783d7a09a8
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TypeAliasDeclaration.java
@@ -0,0 +1,53 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.Visitor;
+
+public class TypeAliasDeclaration extends Statement implements INodeWithSymbol {
+	private final Identifier name;
+	private final List<TypeParameter> typeParameters;
+	private final ITypeExpression definition;
+	private int typeSymbol = -1;
+
+	public TypeAliasDeclaration(SourceLocation loc, Identifier name, List<TypeParameter> typeParameters, ITypeExpression definition) {
+		super("TypeAliasDeclaration", loc);
+		this.name = name;
+		this.typeParameters = typeParameters;
+		this.definition = definition;
+	}
+
+	public Identifier getId() {
+		return name;
+	}
+
+	public List<TypeParameter> getTypeParameters() {
+		return typeParameters;
+	}
+
+	public boolean hasTypeParameters() {
+		return !typeParameters.isEmpty();
+	}
+
+	public ITypeExpression getDefinition() {
+		return definition;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+
+	@Override
+	public int getSymbol() {
+		return typeSymbol;
+	}
+
+	@Override
+	public void setSymbol(int symbol) {
+		this.typeSymbol = symbol;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TypeAssertion.java b/javascript/extractor/src/com/semmle/ts/ast/TypeAssertion.java
new file mode 100644
index 00000000000..116c9cbfa22
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TypeAssertion.java
@@ -0,0 +1,42 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Expression;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * An expression of form <code>E as T</code> or <code>&lt;T&gt; E</code>.
+ */
+public class TypeAssertion extends Expression {
+	private final Expression expression;
+	private final ITypeExpression typeAnnotation;
+	private final boolean isAsExpression;
+
+	public TypeAssertion(SourceLocation loc, Expression expression, ITypeExpression typeAnnotation, boolean isAsExpression) {
+		super("TypeAssertion", loc);
+		this.expression = expression;
+		this.typeAnnotation = typeAnnotation;
+		this.isAsExpression = isAsExpression;
+	}
+
+	public Expression getExpression() {
+		return expression;
+	}
+
+	public ITypeExpression getTypeAnnotation() {
+		return typeAnnotation;
+	}
+
+	/**
+	 * True if this is an assertion of form <tt>E as T</tt>, as opposed to the old
+	 * syntax <code>&lt;T&gt; E</code>.
+	 */
+	public boolean isAsExpression() {
+		return isAsExpression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TypeExpression.java b/javascript/extractor/src/com/semmle/ts/ast/TypeExpression.java
new file mode 100644
index 00000000000..a662810a716
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TypeExpression.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Node;
+import com.semmle.js.ast.SourceLocation;
+
+/**
+ * An AST node that may occur as part of a TypeScript type annotation and is not
+ * also an expression.
+ */
+public abstract class TypeExpression extends Node implements ITypeExpression {
+	private int staticTypeId = -1;
+
+	public TypeExpression(String type, SourceLocation loc) {
+		super(type, loc);
+	}
+
+	@Override
+	public int getStaticTypeId() {
+		return staticTypeId;
+	}
+
+	@Override
+	public void setStaticTypeId(int staticTypeId) {
+		this.staticTypeId = staticTypeId;
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TypeParameter.java b/javascript/extractor/src/com/semmle/ts/ast/TypeParameter.java
new file mode 100644
index 00000000000..530edb3ab54
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TypeParameter.java
@@ -0,0 +1,53 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.Identifier;
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type parameter declared on a class, interface, function, or type alias.
+ * <p>
+ * The general form of a type parameter is: <tt>S extends T = U</tt>.
+ */
+public class TypeParameter extends TypeExpression {
+	private final Identifier id;
+	private final ITypeExpression bound;
+	private final ITypeExpression default_;
+
+	public TypeParameter(SourceLocation loc, Identifier id, ITypeExpression bound, ITypeExpression default_) {
+		super("TypeParameter", loc);
+		this.id = id;
+		this.bound = bound;
+		this.default_ = default_;
+	}
+
+	public Identifier getId() {
+		return id;
+	}
+
+	/**
+	 * Returns the bound on the type parameter, or {@code null} if there is no
+	 * bound.
+	 * <p>
+	 * For example, in <tt>T extends Array = number[]</tt> the bound is
+	 * <tt>Array</tt>.
+	 */
+	public ITypeExpression getBound() {
+		return bound;
+	}
+
+	/**
+	 * Returns the type parameter default, or {@code null} if there is no default,
+	 * <p>
+	 * For example, in <tt>T extends Array = number[]</tt> the default is
+	 * <tt>number[]</tt>.
+	 */
+	public ITypeExpression getDefault() {
+		return default_;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/TypeofTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/TypeofTypeExpr.java
new file mode 100644
index 00000000000..5f8d6b65cf7
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/TypeofTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/**
+ * A type of form <tt>typeof E</tt> where <tt>E</tt> is an expression that takes
+ * the form of a qualified name.
+ */
+public class TypeofTypeExpr extends TypeExpression {
+	private final ITypeExpression expression; // Always Identifier or MemberExpression.
+
+	public TypeofTypeExpr(SourceLocation loc, ITypeExpression expression) {
+		super("TypeofTypeExpr", loc);
+		this.expression = expression;
+	}
+
+	public ITypeExpression getExpression() {
+		return expression;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/ast/UnionTypeExpr.java b/javascript/extractor/src/com/semmle/ts/ast/UnionTypeExpr.java
new file mode 100644
index 00000000000..8de726e6ed5
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/ast/UnionTypeExpr.java
@@ -0,0 +1,26 @@
+package com.semmle.ts.ast;
+
+import java.util.List;
+
+import com.semmle.js.ast.SourceLocation;
+import com.semmle.js.ast.Visitor;
+
+/** A union type such as <tt>number | string | boolean</tt>. */
+public class UnionTypeExpr extends TypeExpression {
+	private final List<ITypeExpression> elementTypes;
+
+	public UnionTypeExpr(SourceLocation loc, List<ITypeExpression> elementTypes) {
+		super("UnionTypeExpr", loc);
+		this.elementTypes = elementTypes;
+	}
+
+	/** The members of the union; always contains at least two types. */
+	public List<ITypeExpression> getElementTypes() {
+		return elementTypes;
+	}
+
+	@Override
+	public <C, R> R accept(Visitor<C, R> v, C c) {
+		return v.visit(this, c);
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/extractor/TypeExtractor.java b/javascript/extractor/src/com/semmle/ts/extractor/TypeExtractor.java
new file mode 100644
index 00000000000..0845a1eda2f
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/extractor/TypeExtractor.java
@@ -0,0 +1,247 @@
+package com.semmle.ts.extractor;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import com.semmle.util.trap.TrapWriter;
+import com.semmle.util.trap.TrapWriter.Label;
+
+/**
+ * Extracts type and symbol information into TRAP files.
+ * <p>
+ * This is closely coupled with the <tt>type_table.ts</tt> file in the
+ * parser-wrapper. Type strings and symbol strings generated in that file are
+ * parsed here. See that file for reference and documentation.
+ */
+public class TypeExtractor {
+	private final TrapWriter trapWriter;
+	private final TypeTable table;
+
+	private static final Map<String, Integer> tagToKind = new LinkedHashMap<String, Integer>();
+
+	private static final int referenceKind = 6;
+	private static final int objectKind = 7;
+	private static final int typevarKind = 8;
+	private static final int typeofKind = 9;
+	private static final int uniqueSymbolKind = 15;
+	private static final int tupleKind = 18;
+	private static final int lexicalTypevarKind = 19;
+	private static final int thisKind = 20;
+	private static final int numberLiteralTypeKind = 21;
+	private static final int stringLiteralTypeKind = 22;
+
+	static {
+		tagToKind.put("any", 0);
+		tagToKind.put("string", 1);
+		tagToKind.put("number", 2);
+		tagToKind.put("union", 3);
+		tagToKind.put("true", 4);
+		tagToKind.put("false", 5);
+		tagToKind.put("reference", referenceKind);
+		tagToKind.put("object", objectKind);
+		tagToKind.put("typevar", typevarKind);
+		tagToKind.put("typeof", typeofKind);
+		tagToKind.put("void", 10);
+		tagToKind.put("undefined", 11);
+		tagToKind.put("null", 12);
+		tagToKind.put("never", 13);
+		tagToKind.put("plainsymbol", 14);
+		tagToKind.put("uniquesymbol", uniqueSymbolKind);
+		tagToKind.put("objectkeyword", 16);
+		tagToKind.put("intersection", 17);
+		tagToKind.put("tuple", tupleKind);
+		tagToKind.put("lextypevar", lexicalTypevarKind);
+		tagToKind.put("this", thisKind);
+		tagToKind.put("numlit", numberLiteralTypeKind);
+		tagToKind.put("strlit", stringLiteralTypeKind);
+		tagToKind.put("unknown", 23);
+	}
+
+	private static final Map<String, Integer> symbolKind = new LinkedHashMap<String, Integer>();
+
+	static {
+		symbolKind.put("root", 0);
+		symbolKind.put("member", 1);
+		symbolKind.put("other", 2);
+	}
+
+	public TypeExtractor(TrapWriter trapWriter, TypeTable table) {
+		this.trapWriter = trapWriter;
+		this.table = table;
+	}
+
+	public void extract() {
+		for (int i = 0; i < table.getNumberOfTypes(); ++i) {
+			extractType(i);
+		}
+		extractPropertyLookups(table.getPropertyLookups());
+		for (int i = 0; i < table.getNumberOfSymbols(); ++i) {
+			extractSymbol(i);
+		}
+		extractSymbolNameMapping("symbol_module", table.getModuleMappings());
+		extractSymbolNameMapping("symbol_global", table.getGlobalMappings());
+		extractSignatureMappings(table.getSignatureMappings());
+		for (int i = 0; i < table.getNumberOfSignatures(); ++i) {
+			extractSignature(i);
+		}
+		extractIndexTypeTable(table.getNumberIndexTypes(), "number_index_type");
+		extractIndexTypeTable(table.getStringIndexTypes(), "string_index_type");
+		extractBaseTypes(table.getBaseTypes());
+		extractSelfTypes(table.getSelfTypes());
+	}
+
+	private void extractType(int id) {
+		Label lbl = trapWriter.globalID("type;" + id);
+		String contents = table.getTypeString(id);
+		String[] parts = contents.split(";");
+		int kind = tagToKind.get(parts[0]);
+		trapWriter.addTuple("types", lbl, kind, table.getTypeToStringValue(id));
+		int firstChild = 1;
+		switch (kind) {
+		case referenceKind:
+		case typevarKind:
+		case typeofKind:
+		case uniqueSymbolKind: {
+			// The first part of a reference is the symbol for name binding.
+			Label symbol = trapWriter.globalID("symbol;" + parts[1]);
+			trapWriter.addTuple("type_symbol", lbl, symbol);
+			++firstChild;
+			break;
+		}
+		case tupleKind: {
+			// The first two parts denote minimum length and presence of rest element.
+			trapWriter.addTuple("tuple_type_min_length", lbl, Integer.parseInt(parts[1]));
+			if (parts[2].equals("t")) {
+				trapWriter.addTuple("tuple_type_rest", lbl);
+			}
+			firstChild += 2;
+			break;
+		}
+		case objectKind:
+		case lexicalTypevarKind:
+			firstChild = parts.length; // No children.
+			break;
+
+		case numberLiteralTypeKind:
+		case stringLiteralTypeKind:
+			firstChild = parts.length; // No children.
+			// The string value may contain `;` so don't use the split().
+			String value = contents.substring(parts[0].length() + 1);
+			trapWriter.addTuple("type_literal_value", lbl, value);
+			break;
+		}
+		for (int i = firstChild; i < parts.length; ++i) {
+			Label childLabel = trapWriter.globalID("type;" + parts[i]);
+			trapWriter.addTuple("type_child", childLabel, lbl, i - firstChild);
+		}
+	}
+
+	private void extractPropertyLookups(JsonObject lookups) {
+		JsonArray baseTypes = lookups.get("baseTypes").getAsJsonArray();
+		JsonArray names = lookups.get("names").getAsJsonArray();
+		JsonArray propertyTypes = lookups.get("propertyTypes").getAsJsonArray();
+		for (int i = 0; i < baseTypes.size(); ++i) {
+			int baseType = baseTypes.get(i).getAsInt();
+			String name = names.get(i).getAsString();
+			int propertyType = propertyTypes.get(i).getAsInt();
+			trapWriter.addTuple("type_property", trapWriter.globalID("type;" + baseType), name,
+					trapWriter.globalID("type;" + propertyType));
+		}
+	}
+
+	private void extractSymbol(int index) {
+		// Format is: kind;decl;name[;parent]
+		String[] parts = table.getSymbolString(index).split(";");
+		int kind = symbolKind.get(parts[0]);
+		String name = parts[2];
+		Label label = trapWriter.globalID("symbol;" + index);
+		trapWriter.addTuple("symbols", label, kind, name);
+		if (parts.length == 4) {
+			Label parentLabel = trapWriter.globalID("symbol;" + parts[3]);
+			trapWriter.addTuple("symbol_parent", label, parentLabel);
+		}
+	}
+
+	private void extractSymbolNameMapping(String relationName, JsonObject mappings) {
+		JsonArray symbols = mappings.get("symbols").getAsJsonArray();
+		JsonArray names = mappings.get("names").getAsJsonArray();
+		for (int i = 0; i < symbols.size(); ++i) {
+			Label symbol = trapWriter.globalID("symbol;" + symbols.get(i).getAsInt());
+			String moduleName = names.get(i).getAsString();
+			trapWriter.addTuple(relationName, symbol, moduleName);
+		}
+	}
+
+	private void extractSignature(int index) {
+		// Format is:
+		// kind;numTypeParams;requiredParams;returnType(;paramName;paramType)*
+		String[] parts = table.getSignatureString(index).split(";");
+		Label label = trapWriter.globalID("signature;" + index);
+		int kind = Integer.parseInt(parts[0]);
+		int numberOfTypeParameters = Integer.parseInt(parts[1]);
+		int requiredParameters = Integer.parseInt(parts[2]);
+		Label returnType = trapWriter.globalID("type;" + parts[3]);
+		trapWriter.addTuple("signature_types", label, kind, table.getSignatureToStringValue(index), numberOfTypeParameters,
+				requiredParameters);
+		trapWriter.addTuple("signature_contains_type", returnType, label, -1);
+		int numberOfParameters = (parts.length - 4) / 2; // includes type parameters
+		for (int i = 0; i < numberOfParameters; ++i) {
+			int partIndex = 4 + (2 * i);
+			String paramName = parts[partIndex];
+			String paramTypeId = parts[partIndex + 1];
+			if (paramTypeId.length() > 0) { // Unconstrained type parameters have an empty type ID.
+				Label paramType = trapWriter.globalID("type;" + parts[partIndex + 1]);
+				trapWriter.addTuple("signature_contains_type", paramType, label, i);
+			}
+			trapWriter.addTuple("signature_parameter_name", label, i, paramName);
+		}
+	}
+
+	private void extractSignatureMappings(JsonObject mappings) {
+		JsonArray baseTypes = mappings.get("baseTypes").getAsJsonArray();
+		JsonArray kinds = mappings.get("kinds").getAsJsonArray();
+		JsonArray indices = mappings.get("indices").getAsJsonArray();
+		JsonArray signatures = mappings.get("signatures").getAsJsonArray();
+		for (int i = 0; i < baseTypes.size(); ++i) {
+			int baseType = baseTypes.get(i).getAsInt();
+			int kind = kinds.get(i).getAsInt();
+			int index = indices.get(i).getAsInt();
+			int signatureId = signatures.get(i).getAsInt();
+			trapWriter.addTuple("type_contains_signature", trapWriter.globalID("type;" + baseType), kind, index,
+					trapWriter.globalID("signature;" + signatureId));
+		}
+	}
+
+	private void extractIndexTypeTable(JsonObject table, String relationName) {
+		JsonArray baseTypes = table.get("baseTypes").getAsJsonArray();
+		JsonArray propertyTypes = table.get("propertyTypes").getAsJsonArray();
+		for (int i = 0; i < baseTypes.size(); ++i) {
+			int baseType = baseTypes.get(i).getAsInt();
+			int propertyType = propertyTypes.get(i).getAsInt();
+			trapWriter.addTuple(relationName, trapWriter.globalID("type;" + baseType), trapWriter.globalID("type;" + propertyType));
+		}
+	}
+
+	private void extractBaseTypes(JsonObject table) {
+		JsonArray symbols = table.get("symbols").getAsJsonArray();
+		JsonArray baseTypeSymbols = table.get("baseTypeSymbols").getAsJsonArray();
+		for (int i = 0; i < symbols.size(); ++i) {
+			int symbolId = symbols.get(i).getAsInt();
+			int baseTypeSymbolId = baseTypeSymbols.get(i).getAsInt();
+			trapWriter.addTuple("base_type_names", trapWriter.globalID("symbol;" + symbolId),
+					trapWriter.globalID("symbol;" + baseTypeSymbolId));
+		}
+	}
+
+	private void extractSelfTypes(JsonObject table) {
+		JsonArray symbols = table.get("symbols").getAsJsonArray();
+		JsonArray selfTypes = table.get("selfTypes").getAsJsonArray();
+		for (int i = 0; i < symbols.size(); ++i) {
+			int symbolId = symbols.get(i).getAsInt();
+			int typeId = selfTypes.get(i).getAsInt();
+			trapWriter.addTuple("self_types", trapWriter.globalID("symbol;" + symbolId), trapWriter.globalID("type;" + typeId));
+		}
+	}
+}
diff --git a/javascript/extractor/src/com/semmle/ts/extractor/TypeTable.java b/javascript/extractor/src/com/semmle/ts/extractor/TypeTable.java
new file mode 100644
index 00000000000..c2bd5156cb1
--- /dev/null
+++ b/javascript/extractor/src/com/semmle/ts/extractor/TypeTable.java
@@ -0,0 +1,113 @@
+package com.semmle.ts.extractor;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+
+/**
+ * Holds the output of the <tt>get-type-table</tt> command.
+ * <p>
+ * See documentation in <tt>parser-wrapper/src/type_table.ts</tt>.
+ */
+public class TypeTable {
+	private final JsonArray typeStrings;
+	private final JsonArray typeToStringValues;
+	private final JsonObject propertyLookups;
+	private final JsonArray symbolStrings;
+	private final JsonObject moduleMappings;
+	private final JsonObject globalMappings;
+	private final JsonArray signatureStrings;
+	private final JsonObject signatureMappings;
+	private final JsonArray signatureToStringValues;
+	private final JsonObject stringIndexTypes;
+	private final JsonObject numberIndexTypes;
+	private final JsonObject baseTypes;
+	private final JsonObject selfTypes;
+
+	public TypeTable(JsonObject typeTable) {
+		this.typeStrings = typeTable.get("typeStrings").getAsJsonArray();
+		this.typeToStringValues = typeTable.get("typeToStringValues").getAsJsonArray();
+		this.propertyLookups = typeTable.get("propertyLookups").getAsJsonObject();
+		this.symbolStrings = typeTable.get("symbolStrings").getAsJsonArray();
+		this.moduleMappings = typeTable.get("moduleMappings").getAsJsonObject();
+		this.globalMappings = typeTable.get("globalMappings").getAsJsonObject();
+		this.signatureStrings = typeTable.get("signatureStrings").getAsJsonArray();
+		this.signatureMappings = typeTable.get("signatureMappings").getAsJsonObject();
+		this.signatureToStringValues = typeTable.get("signatureToStringValues").getAsJsonArray();
+		this.numberIndexTypes = typeTable.get("numberIndexTypes").getAsJsonObject();
+		this.stringIndexTypes = typeTable.get("stringIndexTypes").getAsJsonObject();
+		this.baseTypes = typeTable.get("baseTypes").getAsJsonObject();
+		this.selfTypes = typeTable.get("selfTypes").getAsJsonObject();
+	}
+
+	public String getTypeString(int index) {
+		return typeStrings.get(index).getAsString();
+	}
+
+	public String getTypeToStringValue(int index) {
+		return typeToStringValues.get(index).getAsString();
+	}
+
+	public JsonObject getPropertyLookups() {
+		return propertyLookups;
+	}
+
+	public int getNumberOfTypes() {
+		return typeStrings.size();
+	}
+
+	public String getSymbolString(int index) {
+		return symbolStrings.get(index).getAsString();
+	}
+
+	public int getNumberOfSymbols() {
+		return symbolStrings.size();
+	}
+
+	public JsonObject getModuleMappings() {
+		return moduleMappings;
+	}
+
+	public JsonObject getGlobalMappings() {
+		return globalMappings;
+	}
+
+	public JsonArray getSignatureStrings() {
+		return signatureStrings;
+	}
+
+	public int getNumberOfSignatures() {
+		return signatureStrings.size();
+	}
+
+	public String getSignatureString(int i) {
+		return signatureStrings.get(i).getAsString();
+	}
+
+	public JsonObject getSignatureMappings() {
+		return signatureMappings;
+	}
+
+	public JsonArray getSignatureToStringValues() {
+		return signatureToStringValues;
+	}
+
+	public String getSignatureToStringValue(int i) {
+		return signatureToStringValues.get(i).getAsString();
+	}
+
+	public JsonObject getNumberIndexTypes() {
+		return numberIndexTypes;
+	}
+
+	public JsonObject getStringIndexTypes() {
+		return stringIndexTypes;
+	}
+
+	public JsonObject getBaseTypes() {
+		return baseTypes;
+	}
+
+	public JsonObject getSelfTypes() {
+		return selfTypes;
+	}
+}
diff --git a/javascript/extractor/tests/cfg/input/classexpr1.js b/javascript/extractor/tests/cfg/input/classexpr1.js
new file mode 100644
index 00000000000..995798d72bf
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/classexpr1.js
@@ -0,0 +1 @@
+!class {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/classexpr2.js b/javascript/extractor/tests/cfg/input/classexpr2.js
new file mode 100644
index 00000000000..5e5606eeec0
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/classexpr2.js
@@ -0,0 +1 @@
+!class A {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/classexpr3.js b/javascript/extractor/tests/cfg/input/classexpr3.js
new file mode 100644
index 00000000000..88bb23100d1
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/classexpr3.js
@@ -0,0 +1 @@
+!class extends B {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/classexpr4.js b/javascript/extractor/tests/cfg/input/classexpr4.js
new file mode 100644
index 00000000000..b2fbe2c803c
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/classexpr4.js
@@ -0,0 +1 @@
+!class A extends B {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/fields.js b/javascript/extractor/tests/cfg/input/fields.js
new file mode 100644
index 00000000000..e93c13eaa18
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/fields.js
@@ -0,0 +1,18 @@
+class A {
+  constructor() {
+    ctor;
+  }
+  x;
+  static y;
+  f() {}
+  static g() {}
+}
+
+class B extends A {
+  constructor() {
+    before;
+    super();
+    after;
+  }
+  z;
+}
diff --git a/javascript/extractor/tests/cfg/input/seq.js b/javascript/extractor/tests/cfg/input/seq.js
new file mode 100644
index 00000000000..6771f8792b8
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/seq.js
@@ -0,0 +1 @@
+if(x,1+2,y||z);
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/short-circuit.js b/javascript/extractor/tests/cfg/input/short-circuit.js
new file mode 100644
index 00000000000..bfe245c1202
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/short-circuit.js
@@ -0,0 +1,2 @@
+a && b && c;
+x || y || z;
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/ternary.js b/javascript/extractor/tests/cfg/input/ternary.js
new file mode 100644
index 00000000000..5298fc7416d
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/ternary.js
@@ -0,0 +1 @@
+(a ? b || c : d) || e;
\ No newline at end of file
diff --git a/javascript/extractor/tests/cfg/input/tst.js b/javascript/extractor/tests/cfg/input/tst.js
new file mode 100644
index 00000000000..67b814739c0
--- /dev/null
+++ b/javascript/extractor/tests/cfg/input/tst.js
@@ -0,0 +1,36 @@
+function outer()
+{
+    var i = 0;
+    var i = 1;
+    for ( i = 0 ; i < 32 ; ++i );
+    switch (i) {
+    case 32:
+        return true;
+    }
+}
+
+for (;a;)
+    continue;
+
+function f(o) {
+    for (var p in o)
+        if (p);
+}
+
+try  {
+} catch (e) {
+    o.m();
+} finally {
+}
+
+try {
+    for (i in headers);
+} catch(_) {}
+
+try {
+} finally {
+    f();
+}
+
+if (!(x || y))
+  z;
diff --git a/javascript/extractor/tests/cfg/options.json b/javascript/extractor/tests/cfg/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/cfg/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/cfg/output/trap/classexpr1.js.trap b/javascript/extractor/tests/cfg/output/trap/classexpr1.js.trap
new file mode 100644
index 00000000000..2b457001bcd
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/classexpr1.js.trap
@@ -0,0 +1,121 @@
+#10000=@"/classexpr1.js;sourcefile"
+files(#10000,"/classexpr1.js","classexpr1","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,10"
+locations_default(#20002,#10000,1,1,1,10)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"!class {};")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,18,#20003,0,"!class {}")
+#20005=@"loc,{#10000},1,1,1,9"
+locations_default(#20005,#10000,1,1,1,9)
+hasLocation(#20004,#20005)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+#20006=*
+exprs(#20006,80,#20004,0,"class {}")
+#20007=@"loc,{#10000},1,2,1,9"
+locations_default(#20007,#10000,1,2,1,9)
+hasLocation(#20006,#20007)
+enclosingStmt(#20006,#20003)
+exprContainers(#20006,#20001)
+#20008=*
+properties(#20008,#20006,2,0,"constructor() {}")
+#20009=@"loc,{#10000},1,8,1,7"
+locations_default(#20009,#10000,1,8,1,7)
+hasLocation(#20008,#20009)
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+hasLocation(#20010,#20009)
+enclosingStmt(#20010,#20003)
+exprContainers(#20010,#20001)
+literals("constructor","constructor",#20010)
+#20011=*
+exprs(#20011,9,#20008,1,"() {}")
+hasLocation(#20011,#20009)
+enclosingStmt(#20011,#20003)
+exprContainers(#20011,#20001)
+#20012=*
+scopes(#20012,1)
+scopenodes(#20011,#20012)
+scopenesting(#20012,#20000)
+#20013=@"var;{arguments};{#20012}"
+variables(#20013,"arguments",#20012)
+isArgumentsObject(#20013)
+#20014=*
+stmts(#20014,1,#20011,-2,"{}")
+hasLocation(#20014,#20009)
+stmtContainers(#20014,#20011)
+numlines(#20011,1,0,0)
+isMethod(#20008)
+#20015=*
+lines(#20015,#20001,"!class {};","")
+hasLocation(#20015,#20002)
+numlines(#20001,1,1,0)
+#20016=*
+tokeninfo(#20016,8,#20001,0,"!")
+#20017=@"loc,{#10000},1,1,1,1"
+locations_default(#20017,#10000,1,1,1,1)
+hasLocation(#20016,#20017)
+#20018=*
+tokeninfo(#20018,7,#20001,1,"class")
+#20019=@"loc,{#10000},1,2,1,6"
+locations_default(#20019,#10000,1,2,1,6)
+hasLocation(#20018,#20019)
+#20020=*
+tokeninfo(#20020,8,#20001,2,"{")
+#20021=@"loc,{#10000},1,8,1,8"
+locations_default(#20021,#10000,1,8,1,8)
+hasLocation(#20020,#20021)
+#20022=*
+tokeninfo(#20022,8,#20001,3,"}")
+#20023=@"loc,{#10000},1,9,1,9"
+locations_default(#20023,#10000,1,9,1,9)
+hasLocation(#20022,#20023)
+#20024=*
+tokeninfo(#20024,8,#20001,4,";")
+#20025=@"loc,{#10000},1,10,1,10"
+locations_default(#20025,#10000,1,10,1,10)
+hasLocation(#20024,#20025)
+#20026=*
+tokeninfo(#20026,0,#20001,5,"")
+#20027=@"loc,{#10000},1,11,1,10"
+locations_default(#20027,#10000,1,11,1,10)
+hasLocation(#20026,#20027)
+#20028=*
+entry_cfg_node(#20028,#20001)
+#20029=@"loc,{#10000},1,1,1,0"
+locations_default(#20029,#10000,1,1,1,0)
+hasLocation(#20028,#20029)
+#20030=*
+exit_cfg_node(#20030,#20001)
+hasLocation(#20030,#20027)
+successor(#20003,#20010)
+successor(#20011,#20008)
+#20031=*
+entry_cfg_node(#20031,#20011)
+hasLocation(#20031,#20009)
+#20032=*
+exit_cfg_node(#20032,#20011)
+hasLocation(#20032,#20009)
+successor(#20014,#20032)
+successor(#20031,#20014)
+successor(#20010,#20011)
+successor(#20008,#20006)
+successor(#20006,#20004)
+successor(#20004,#20030)
+successor(#20028,#20003)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/cfg/output/trap/classexpr2.js.trap b/javascript/extractor/tests/cfg/output/trap/classexpr2.js.trap
new file mode 100644
index 00000000000..843cafdee61
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/classexpr2.js.trap
@@ -0,0 +1,143 @@
+#10000=@"/classexpr2.js;sourcefile"
+files(#10000,"/classexpr2.js","classexpr2","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,12"
+locations_default(#20002,#10000,1,1,1,12)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"!class A {};")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,18,#20003,0,"!class A {}")
+#20005=@"loc,{#10000},1,1,1,11"
+locations_default(#20005,#10000,1,1,1,11)
+hasLocation(#20004,#20005)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+#20006=*
+exprs(#20006,80,#20004,0,"class A {}")
+#20007=@"loc,{#10000},1,2,1,11"
+locations_default(#20007,#10000,1,2,1,11)
+hasLocation(#20006,#20007)
+enclosingStmt(#20006,#20003)
+exprContainers(#20006,#20001)
+#20008=*
+scopes(#20008,8)
+scopenodes(#20006,#20008)
+scopenesting(#20008,#20000)
+#20009=@"var;{A};{#20008}"
+variables(#20009,"A",#20008)
+#20010=@"local_type_name;{A};{#20008}"
+local_type_names(#20010,"A",#20008)
+#20011=*
+exprs(#20011,78,#20006,0,"A")
+#20012=@"loc,{#10000},1,8,1,8"
+locations_default(#20012,#10000,1,8,1,8)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20003)
+exprContainers(#20011,#20001)
+literals("A","A",#20011)
+decl(#20011,#20009)
+typedecl(#20011,#20010)
+#20013=*
+properties(#20013,#20006,2,0,"constructor() {}")
+#20014=@"loc,{#10000},1,10,1,9"
+locations_default(#20014,#10000,1,10,1,9)
+hasLocation(#20013,#20014)
+#20015=*
+exprs(#20015,0,#20013,0,"constructor")
+hasLocation(#20015,#20014)
+enclosingStmt(#20015,#20003)
+exprContainers(#20015,#20001)
+literals("constructor","constructor",#20015)
+#20016=*
+exprs(#20016,9,#20013,1,"() {}")
+hasLocation(#20016,#20014)
+enclosingStmt(#20016,#20003)
+exprContainers(#20016,#20001)
+#20017=*
+scopes(#20017,1)
+scopenodes(#20016,#20017)
+scopenesting(#20017,#20008)
+#20018=@"var;{arguments};{#20017}"
+variables(#20018,"arguments",#20017)
+isArgumentsObject(#20018)
+#20019=*
+stmts(#20019,1,#20016,-2,"{}")
+hasLocation(#20019,#20014)
+stmtContainers(#20019,#20016)
+numlines(#20016,1,0,0)
+isMethod(#20013)
+#20020=*
+lines(#20020,#20001,"!class A {};","")
+hasLocation(#20020,#20002)
+numlines(#20001,1,1,0)
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+tokeninfo(#20021,8,#20001,0,"!")
+#20022=@"loc,{#10000},1,1,1,1"
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+#20024=@"loc,{#10000},1,2,1,6"
+locations_default(#20024,#10000,1,2,1,6)
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+#20027=@"loc,{#10000},1,10,1,10"
+locations_default(#20027,#10000,1,10,1,10)
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+tokeninfo(#20028,8,#20001,4,"}")
+#20029=@"loc,{#10000},1,11,1,11"
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+locations_default(#20031,#10000,1,12,1,12)
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+#20035=@"loc,{#10000},1,1,1,0"
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+successor(#20016,#20013)
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+hasLocation(#20038,#20014)
+successor(#20019,#20038)
+successor(#20037,#20019)
+successor(#20015,#20016)
+successor(#20013,#20006)
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+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/cfg/output/trap/classexpr3.js.trap b/javascript/extractor/tests/cfg/output/trap/classexpr3.js.trap
new file mode 100644
index 00000000000..91819742ab9
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/classexpr3.js.trap
@@ -0,0 +1,182 @@
+#10000=@"/classexpr3.js;sourcefile"
+files(#10000,"/classexpr3.js","classexpr3","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
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new file mode 100644
index 00000000000..37c50c3399d
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/classexpr4.js.trap
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new file mode 100644
index 00000000000..d541e0d1c35
--- /dev/null
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diff --git a/javascript/extractor/tests/cfg/output/trap/short-circuit.js.trap b/javascript/extractor/tests/cfg/output/trap/short-circuit.js.trap
new file mode 100644
index 00000000000..eea493fc209
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/short-circuit.js.trap
@@ -0,0 +1,241 @@
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diff --git a/javascript/extractor/tests/cfg/output/trap/ternary.js.trap b/javascript/extractor/tests/cfg/output/trap/ternary.js.trap
new file mode 100644
index 00000000000..fe017e828ba
--- /dev/null
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diff --git a/javascript/extractor/tests/cfg/output/trap/tst.js.trap b/javascript/extractor/tests/cfg/output/trap/tst.js.trap
new file mode 100644
index 00000000000..5dd8b77a97d
--- /dev/null
+++ b/javascript/extractor/tests/cfg/output/trap/tst.js.trap
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+locations_default(#20458,#10000,37,1,37,0)
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+#20460=@"loc,{#10000},1,1,1,0"
+locations_default(#20460,#10000,1,1,1,0)
+hasLocation(#20459,#20460)
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+hasLocation(#20461,#20458)
+successor(#20155,#20159)
+successor(#20159,#20161)
+successor(#20161,#20163)
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+successor(#20462,#20157)
+#20463=*
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+hasLocation(#20463,#20164)
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+successor(#20163,#20463)
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diff --git a/javascript/extractor/tests/comments/input/comments.js b/javascript/extractor/tests/comments/input/comments.js
new file mode 100644
index 00000000000..a109ece3c6a
--- /dev/null
+++ b/javascript/extractor/tests/comments/input/comments.js
@@ -0,0 +1,5 @@
+// line comment
+/* block comment */
+/** doc comment */
+<!-- an HTML comment
+--> another HTML comment
\ No newline at end of file
diff --git a/javascript/extractor/tests/comments/input/empty_comment.js b/javascript/extractor/tests/comments/input/empty_comment.js
new file mode 100644
index 00000000000..9d6f459ad89
--- /dev/null
+++ b/javascript/extractor/tests/comments/input/empty_comment.js
@@ -0,0 +1 @@
+/**/
diff --git a/javascript/extractor/tests/comments/input/jsdoc.js b/javascript/extractor/tests/comments/input/jsdoc.js
new file mode 100644
index 00000000000..e8b4b59c3bf
--- /dev/null
+++ b/javascript/extractor/tests/comments/input/jsdoc.js
@@ -0,0 +1,17 @@
+/**
+ * This is a constant.
+ * 
+ * @const x
+ */
+/** @class {Object} klass */
+/** @deprecated */
+/** @param {(int|bool)} x
+ *  @param {Array.<String, Number>} ys
+ *  @param {String[]} zs
+ *  @param {function(new:goog.ui.Menu, ?string=, number=): void} f
+ *  @param {...number} var_args
+ */
+/**
+ * @param {Function(DOMNode)}
+ * @param {Function(DOMNode)} x
+ */
diff --git a/javascript/extractor/tests/comments/output/trap/comments.js.trap b/javascript/extractor/tests/comments/output/trap/comments.js.trap
new file mode 100644
index 00000000000..46de25e43c9
--- /dev/null
+++ b/javascript/extractor/tests/comments/output/trap/comments.js.trap
@@ -0,0 +1,83 @@
+#10000=@"/comments.js;sourcefile"
+files(#10000,"/comments.js","comments","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,5,24"
+locations_default(#20002,#10000,1,1,5,24)
+hasLocation(#20001,#20002)
+#20003=*
+comments(#20003,0,#20001," line comment","// line comment")
+#20004=@"loc,{#10000},1,1,1,15"
+locations_default(#20004,#10000,1,1,1,15)
+hasLocation(#20003,#20004)
+#20005=*
+comments(#20005,1,#20001," block comment ","/* block comment */")
+#20006=@"loc,{#10000},2,1,2,19"
+locations_default(#20006,#10000,2,1,2,19)
+hasLocation(#20005,#20006)
+#20007=*
+comments(#20007,2,#20001," doc comment ","/** doc comment */")
+#20008=@"loc,{#10000},3,1,3,18"
+locations_default(#20008,#10000,3,1,3,18)
+hasLocation(#20007,#20008)
+#20009=*
+comments(#20009,3,#20001," an HTML comment","<!-- an HTML comment")
+#20010=@"loc,{#10000},4,1,4,20"
+locations_default(#20010,#10000,4,1,4,20)
+hasLocation(#20009,#20010)
+#20011=*
+comments(#20011,4,#20001," another HTML comment","--> ano ... comment")
+#20012=@"loc,{#10000},5,1,5,24"
+locations_default(#20012,#10000,5,1,5,24)
+hasLocation(#20011,#20012)
+#20013=*
+lines(#20013,#20001,"// line comment","
+")
+hasLocation(#20013,#20004)
+#20014=*
+lines(#20014,#20001,"/* block comment */","
+")
+hasLocation(#20014,#20006)
+#20015=*
+lines(#20015,#20001,"/** doc comment */","
+")
+hasLocation(#20015,#20008)
+#20016=*
+lines(#20016,#20001,"<!-- an HTML comment","
+")
+hasLocation(#20016,#20010)
+#20017=*
+lines(#20017,#20001,"--> another HTML comment","")
+hasLocation(#20017,#20012)
+numlines(#20001,5,0,5)
+#20018=*
+tokeninfo(#20018,0,#20001,0,"")
+#20019=@"loc,{#10000},5,25,5,24"
+locations_default(#20019,#10000,5,25,5,24)
+hasLocation(#20018,#20019)
+next_token(#20003,#20018)
+next_token(#20005,#20018)
+next_token(#20007,#20018)
+next_token(#20009,#20018)
+#20020=*
+entry_cfg_node(#20020,#20001)
+#20021=@"loc,{#10000},1,1,1,0"
+locations_default(#20021,#10000,1,1,1,0)
+hasLocation(#20020,#20021)
+#20022=*
+exit_cfg_node(#20022,#20001)
+hasLocation(#20022,#20019)
+successor(#20020,#20022)
+#20023=*
+jsdoc(#20023,"doc comment",#20007)
+hasLocation(#20023,#20008)
+numlines(#10000,5,0,5)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/comments/output/trap/empty_comment.js.trap b/javascript/extractor/tests/comments/output/trap/empty_comment.js.trap
new file mode 100644
index 00000000000..7324758d274
--- /dev/null
+++ b/javascript/extractor/tests/comments/output/trap/empty_comment.js.trap
@@ -0,0 +1,42 @@
+#10000=@"/empty_comment.js;sourcefile"
+files(#10000,"/empty_comment.js","empty_comment","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,0"
+locations_default(#20002,#10000,1,1,2,0)
+hasLocation(#20001,#20002)
+#20003=*
+comments(#20003,1,#20001,"","/**/")
+#20004=@"loc,{#10000},1,1,1,4"
+locations_default(#20004,#10000,1,1,1,4)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"/**/","
+")
+hasLocation(#20005,#20004)
+numlines(#20001,1,0,1)
+#20006=*
+tokeninfo(#20006,0,#20001,0,"")
+#20007=@"loc,{#10000},2,1,2,0"
+locations_default(#20007,#10000,2,1,2,0)
+hasLocation(#20006,#20007)
+next_token(#20003,#20006)
+#20008=*
+entry_cfg_node(#20008,#20001)
+#20009=@"loc,{#10000},1,1,1,0"
+locations_default(#20009,#10000,1,1,1,0)
+hasLocation(#20008,#20009)
+#20010=*
+exit_cfg_node(#20010,#20001)
+hasLocation(#20010,#20007)
+successor(#20008,#20010)
+numlines(#10000,1,0,1)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/comments/output/trap/jsdoc.js.trap b/javascript/extractor/tests/comments/output/trap/jsdoc.js.trap
new file mode 100644
index 00000000000..5c0c6c543b0
--- /dev/null
+++ b/javascript/extractor/tests/comments/output/trap/jsdoc.js.trap
@@ -0,0 +1,303 @@
+#10000=@"/jsdoc.js;sourcefile"
+files(#10000,"/jsdoc.js","jsdoc","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,18,0"
+locations_default(#20002,#10000,1,1,18,0)
+hasLocation(#20001,#20002)
+#20003=*
+comments(#20003,2,#20001,"
+ * This is a constant.
+ * 
+ * @const x
+ ","/**\n *  ... t x\n */")
+#20004=@"loc,{#10000},1,1,5,3"
+locations_default(#20004,#10000,1,1,5,3)
+hasLocation(#20003,#20004)
+#20005=*
+comments(#20005,2,#20001," @class {Object} klass ","/** @cl ... lass */")
+#20006=@"loc,{#10000},6,1,6,28"
+locations_default(#20006,#10000,6,1,6,28)
+hasLocation(#20005,#20006)
+#20007=*
+comments(#20007,2,#20001," @deprecated ","/** @deprecated */")
+#20008=@"loc,{#10000},7,1,7,18"
+locations_default(#20008,#10000,7,1,7,18)
+hasLocation(#20007,#20008)
+#20009=*
+comments(#20009,2,#20001," @param {(int|bool)} x
+ *  @param {Array.<String, Number>} ys
+ *  @param {String[]} zs
+ *  @param {function(new:goog.ui.Menu, ?string=, number=): void} f
+ *  @param {...number} var_args
+ ","/** @pa ... rgs\n */")
+#20010=@"loc,{#10000},8,1,13,3"
+locations_default(#20010,#10000,8,1,13,3)
+hasLocation(#20009,#20010)
+#20011=*
+comments(#20011,2,#20001,"
+ * @param {Function(DOMNode)}
+ * @param {Function(DOMNode)} x
+ ","/**\n *  ... } x\n */")
+#20012=@"loc,{#10000},14,1,17,3"
+locations_default(#20012,#10000,14,1,17,3)
+hasLocation(#20011,#20012)
+#20013=*
+lines(#20013,#20001,"/**","
+")
+#20014=@"loc,{#10000},1,1,1,3"
+locations_default(#20014,#10000,1,1,1,3)
+hasLocation(#20013,#20014)
+#20015=*
+lines(#20015,#20001," * This is a constant.","
+")
+#20016=@"loc,{#10000},2,1,2,22"
+locations_default(#20016,#10000,2,1,2,22)
+hasLocation(#20015,#20016)
+indentation(#10000,2," ",1)
+#20017=*
+lines(#20017,#20001," * ","
+")
+#20018=@"loc,{#10000},3,1,3,3"
+locations_default(#20018,#10000,3,1,3,3)
+hasLocation(#20017,#20018)
+indentation(#10000,3," ",1)
+#20019=*
+lines(#20019,#20001," * @const x","
+")
+#20020=@"loc,{#10000},4,1,4,11"
+locations_default(#20020,#10000,4,1,4,11)
+hasLocation(#20019,#20020)
+indentation(#10000,4," ",1)
+#20021=*
+lines(#20021,#20001," */","
+")
+#20022=@"loc,{#10000},5,1,5,3"
+locations_default(#20022,#10000,5,1,5,3)
+hasLocation(#20021,#20022)
+indentation(#10000,5," ",1)
+#20023=*
+lines(#20023,#20001,"/** @class {Object} klass */","
+")
+hasLocation(#20023,#20006)
+#20024=*
+lines(#20024,#20001,"/** @deprecated */","
+")
+hasLocation(#20024,#20008)
+#20025=*
+lines(#20025,#20001,"/** @param {(int|bool)} x","
+")
+#20026=@"loc,{#10000},8,1,8,25"
+locations_default(#20026,#10000,8,1,8,25)
+hasLocation(#20025,#20026)
+#20027=*
+lines(#20027,#20001," *  @param {Array.<String, Number>} ys","
+")
+#20028=@"loc,{#10000},9,1,9,38"
+locations_default(#20028,#10000,9,1,9,38)
+hasLocation(#20027,#20028)
+indentation(#10000,9," ",1)
+#20029=*
+lines(#20029,#20001," *  @param {String[]} zs","
+")
+#20030=@"loc,{#10000},10,1,10,24"
+locations_default(#20030,#10000,10,1,10,24)
+hasLocation(#20029,#20030)
+indentation(#10000,10," ",1)
+#20031=*
+lines(#20031,#20001," *  @param {function(new:goog.ui.Menu, ?string=, number=): void} f","
+")
+#20032=@"loc,{#10000},11,1,11,66"
+locations_default(#20032,#10000,11,1,11,66)
+hasLocation(#20031,#20032)
+indentation(#10000,11," ",1)
+#20033=*
+lines(#20033,#20001," *  @param {...number} var_args","
+")
+#20034=@"loc,{#10000},12,1,12,31"
+locations_default(#20034,#10000,12,1,12,31)
+hasLocation(#20033,#20034)
+indentation(#10000,12," ",1)
+#20035=*
+lines(#20035,#20001," */","
+")
+#20036=@"loc,{#10000},13,1,13,3"
+locations_default(#20036,#10000,13,1,13,3)
+hasLocation(#20035,#20036)
+indentation(#10000,13," ",1)
+#20037=*
+lines(#20037,#20001,"/**","
+")
+#20038=@"loc,{#10000},14,1,14,3"
+locations_default(#20038,#10000,14,1,14,3)
+hasLocation(#20037,#20038)
+#20039=*
+lines(#20039,#20001," * @param {Function(DOMNode)}","
+")
+#20040=@"loc,{#10000},15,1,15,29"
+locations_default(#20040,#10000,15,1,15,29)
+hasLocation(#20039,#20040)
+indentation(#10000,15," ",1)
+#20041=*
+lines(#20041,#20001," * @param {Function(DOMNode)} x","
+")
+#20042=@"loc,{#10000},16,1,16,31"
+locations_default(#20042,#10000,16,1,16,31)
+hasLocation(#20041,#20042)
+indentation(#10000,16," ",1)
+#20043=*
+lines(#20043,#20001," */","
+")
+#20044=@"loc,{#10000},17,1,17,3"
+locations_default(#20044,#10000,17,1,17,3)
+hasLocation(#20043,#20044)
+indentation(#10000,17," ",1)
+numlines(#20001,17,0,17)
+#20045=*
+tokeninfo(#20045,0,#20001,0,"")
+#20046=@"loc,{#10000},18,1,18,0"
+locations_default(#20046,#10000,18,1,18,0)
+hasLocation(#20045,#20046)
+next_token(#20003,#20045)
+next_token(#20005,#20045)
+next_token(#20007,#20045)
+next_token(#20009,#20045)
+next_token(#20011,#20045)
+#20047=*
+entry_cfg_node(#20047,#20001)
+#20048=@"loc,{#10000},1,1,1,0"
+locations_default(#20048,#10000,1,1,1,0)
+hasLocation(#20047,#20048)
+#20049=*
+exit_cfg_node(#20049,#20001)
+hasLocation(#20049,#20046)
+successor(#20047,#20049)
+#20050=*
+jsdoc(#20050,"This is a constant.",#20003)
+hasLocation(#20050,#20004)
+#20051=*
+jsdoc_tags(#20051,"const",#20050,0,"@const")
+#20052=@"loc,{#10000},4,4,4,9"
+locations_default(#20052,#10000,4,4,4,9)
+hasLocation(#20051,#20052)
+jsdoc_tag_names(#20051,"x")
+#20053=*
+jsdoc(#20053,"",#20005)
+hasLocation(#20053,#20006)
+#20054=*
+jsdoc_tags(#20054,"class",#20053,0,"@class")
+#20055=@"loc,{#10000},6,5,6,10"
+locations_default(#20055,#10000,6,5,6,10)
+hasLocation(#20054,#20055)
+jsdoc_tag_names(#20054,"klass")
+#20056=*
+jsdoc_type_exprs(#20056,5,#20054,0,"Object")
+#20057=*
+jsdoc(#20057,"",#20007)
+hasLocation(#20057,#20008)
+#20058=*
+jsdoc_tags(#20058,"deprecated",#20057,0,"@deprecated")
+#20059=@"loc,{#10000},7,5,7,15"
+locations_default(#20059,#10000,7,5,7,15)
+hasLocation(#20058,#20059)
+#20060=*
+jsdoc(#20060,"",#20009)
+hasLocation(#20060,#20010)
+#20061=*
+jsdoc_tags(#20061,"param",#20060,0,"@param")
+#20062=@"loc,{#10000},8,5,8,10"
+locations_default(#20062,#10000,8,5,8,10)
+hasLocation(#20061,#20062)
+jsdoc_tag_names(#20061,"x")
+#20063=*
+jsdoc_type_exprs(#20063,11,#20061,0,"(int|bool)")
+#20064=*
+jsdoc_type_exprs(#20064,5,#20063,0,"int")
+#20065=*
+jsdoc_type_exprs(#20065,5,#20063,1,"bool")
+#20066=*
+jsdoc_tags(#20066,"param",#20060,1,"@param")
+#20067=@"loc,{#10000},9,5,9,10"
+locations_default(#20067,#10000,9,5,9,10)
+hasLocation(#20066,#20067)
+jsdoc_tag_names(#20066,"ys")
+#20068=*
+jsdoc_type_exprs(#20068,6,#20066,0,"Array.<String, Number>")
+#20069=*
+jsdoc_type_exprs(#20069,5,#20068,-1,"Array")
+#20070=*
+jsdoc_type_exprs(#20070,5,#20068,0,"String")
+#20071=*
+jsdoc_type_exprs(#20071,5,#20068,1,"Number")
+#20072=*
+jsdoc_tags(#20072,"param",#20060,2,"@param")
+#20073=@"loc,{#10000},10,5,10,10"
+locations_default(#20073,#10000,10,5,10,10)
+hasLocation(#20072,#20073)
+jsdoc_tag_names(#20072,"zs")
+#20074=*
+jsdoc_type_exprs(#20074,6,#20072,0,"Array.<String>")
+#20075=*
+jsdoc_type_exprs(#20075,5,#20074,-1,"Array")
+#20076=*
+jsdoc_type_exprs(#20076,5,#20074,0,"String")
+#20077=*
+jsdoc_tags(#20077,"param",#20060,3,"@param")
+#20078=@"loc,{#10000},11,5,11,10"
+locations_default(#20078,#10000,11,5,11,10)
+hasLocation(#20077,#20078)
+jsdoc_tag_names(#20077,"f")
+#20079=*
+jsdoc_type_exprs(#20079,12,#20077,0,"function (new: goog.ui.Menu, ?string=, number=): void")
+#20080=*
+jsdoc_type_exprs(#20080,13,#20079,0,"?string=")
+#20081=*
+jsdoc_type_exprs(#20081,7,#20080,0,"?string")
+#20082=*
+jsdoc_type_exprs(#20082,5,#20081,0,"string")
+jsdoc_prefix_qualifier(#20081)
+#20083=*
+jsdoc_type_exprs(#20083,13,#20079,1,"number=")
+#20084=*
+jsdoc_type_exprs(#20084,5,#20083,0,"number")
+#20085=*
+jsdoc_type_exprs(#20085,4,#20079,-1,"void")
+#20086=*
+jsdoc_type_exprs(#20086,5,#20079,-2,"goog.ui.Menu")
+jsdoc_has_new_parameter(#20079)
+#20087=*
+jsdoc_tags(#20087,"param",#20060,4,"@param")
+#20088=@"loc,{#10000},12,5,12,10"
+locations_default(#20088,#10000,12,5,12,10)
+hasLocation(#20087,#20088)
+jsdoc_tag_names(#20087,"var_args")
+#20089=*
+jsdoc_type_exprs(#20089,14,#20087,0,"...number")
+#20090=*
+jsdoc_type_exprs(#20090,5,#20089,0,"number")
+#20091=*
+jsdoc(#20091,"",#20011)
+hasLocation(#20091,#20012)
+#20092=*
+jsdoc_tags(#20092,"param",#20091,0,"@param")
+#20093=@"loc,{#10000},15,4,15,9"
+locations_default(#20093,#10000,15,4,15,9)
+hasLocation(#20092,#20093)
+#20094=*
+jsdoc_errors(#20094,#20092,"Missing or invalid tag name","Missing ... ag name")
+#20095=*
+jsdoc_tags(#20095,"param",#20091,1,"@param")
+#20096=@"loc,{#10000},16,4,16,9"
+locations_default(#20096,#10000,16,4,16,9)
+hasLocation(#20095,#20096)
+jsdoc_tag_names(#20095,"x")
+numlines(#10000,17,0,17)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/default-encoding/input/latin1.js b/javascript/extractor/tests/default-encoding/input/latin1.js
new file mode 100644
index 00000000000..8e72c87ff25
--- /dev/null
+++ b/javascript/extractor/tests/default-encoding/input/latin1.js
@@ -0,0 +1 @@
+function f(ä, ö) {}
diff --git a/javascript/extractor/tests/default-encoding/options.json b/javascript/extractor/tests/default-encoding/options.json
new file mode 100644
index 00000000000..a4c301a8d29
--- /dev/null
+++ b/javascript/extractor/tests/default-encoding/options.json
@@ -0,0 +1,3 @@
+{
+    "default-encoding": "latin1"
+}
diff --git a/javascript/extractor/tests/default-encoding/output/trap/latin1.js.trap b/javascript/extractor/tests/default-encoding/output/trap/latin1.js.trap
new file mode 100644
index 00000000000..3a8205e2292
--- /dev/null
+++ b/javascript/extractor/tests/default-encoding/output/trap/latin1.js.trap
@@ -0,0 +1,139 @@
+#10000=@"/latin1.js;sourcefile"
+files(#10000,"/latin1.js","latin1","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,0"
+locations_default(#20002,#10000,1,1,2,0)
+hasLocation(#20001,#20002)
+#20003=@"var;{f};{#20000}"
+variables(#20003,"f",#20000)
+#20004=*
+stmts(#20004,17,#20001,0,"function f(\u00e4, \u00f6) {}")
+#20005=@"loc,{#10000},1,1,1,19"
+locations_default(#20005,#10000,1,1,1,19)
+hasLocation(#20004,#20005)
+stmtContainers(#20004,#20001)
+#20006=*
+exprs(#20006,78,#20004,-1,"f")
+#20007=@"loc,{#10000},1,10,1,10"
+locations_default(#20007,#10000,1,10,1,10)
+hasLocation(#20006,#20007)
+exprContainers(#20006,#20004)
+literals("f","f",#20006)
+decl(#20006,#20003)
+#20008=*
+scopes(#20008,1)
+scopenodes(#20004,#20008)
+scopenesting(#20008,#20000)
+#20009=@"var;{ä};{#20008}"
+variables(#20009,"ä",#20008)
+#20010=*
+exprs(#20010,78,#20004,0,"\u00e4")
+#20011=@"loc,{#10000},1,12,1,12"
+locations_default(#20011,#10000,1,12,1,12)
+hasLocation(#20010,#20011)
+exprContainers(#20010,#20004)
+literals("ä","ä",#20010)
+decl(#20010,#20009)
+#20012=@"var;{ö};{#20008}"
+variables(#20012,"ö",#20008)
+#20013=*
+exprs(#20013,78,#20004,1,"\u00f6")
+#20014=@"loc,{#10000},1,15,1,15"
+locations_default(#20014,#10000,1,15,1,15)
+hasLocation(#20013,#20014)
+exprContainers(#20013,#20004)
+literals("ö","ö",#20013)
+decl(#20013,#20012)
+#20015=@"var;{arguments};{#20008}"
+variables(#20015,"arguments",#20008)
+isArgumentsObject(#20015)
+#20016=*
+stmts(#20016,1,#20004,-2,"{}")
+#20017=@"loc,{#10000},1,18,1,19"
+locations_default(#20017,#10000,1,18,1,19)
+hasLocation(#20016,#20017)
+stmtContainers(#20016,#20004)
+numlines(#20004,1,1,0)
+#20018=*
+lines(#20018,#20001,"function f(ä, ö) {}","
+")
+hasLocation(#20018,#20005)
+numlines(#20001,1,1,0)
+#20019=*
+tokeninfo(#20019,7,#20001,0,"function")
+#20020=@"loc,{#10000},1,1,1,8"
+locations_default(#20020,#10000,1,1,1,8)
+hasLocation(#20019,#20020)
+#20021=*
+tokeninfo(#20021,6,#20001,1,"f")
+hasLocation(#20021,#20007)
+#20022=*
+tokeninfo(#20022,8,#20001,2,"(")
+#20023=@"loc,{#10000},1,11,1,11"
+locations_default(#20023,#10000,1,11,1,11)
+hasLocation(#20022,#20023)
+#20024=*
+tokeninfo(#20024,6,#20001,3,"ä")
+hasLocation(#20024,#20011)
+#20025=*
+tokeninfo(#20025,8,#20001,4,",")
+#20026=@"loc,{#10000},1,13,1,13"
+locations_default(#20026,#10000,1,13,1,13)
+hasLocation(#20025,#20026)
+#20027=*
+tokeninfo(#20027,6,#20001,5,"ö")
+hasLocation(#20027,#20014)
+#20028=*
+tokeninfo(#20028,8,#20001,6,")")
+#20029=@"loc,{#10000},1,16,1,16"
+locations_default(#20029,#10000,1,16,1,16)
+hasLocation(#20028,#20029)
+#20030=*
+tokeninfo(#20030,8,#20001,7,"{")
+#20031=@"loc,{#10000},1,18,1,18"
+locations_default(#20031,#10000,1,18,1,18)
+hasLocation(#20030,#20031)
+#20032=*
+tokeninfo(#20032,8,#20001,8,"}")
+#20033=@"loc,{#10000},1,19,1,19"
+locations_default(#20033,#10000,1,19,1,19)
+hasLocation(#20032,#20033)
+#20034=*
+tokeninfo(#20034,0,#20001,9,"")
+#20035=@"loc,{#10000},2,1,2,0"
+locations_default(#20035,#10000,2,1,2,0)
+hasLocation(#20034,#20035)
+#20036=*
+entry_cfg_node(#20036,#20001)
+#20037=@"loc,{#10000},1,1,1,0"
+locations_default(#20037,#10000,1,1,1,0)
+hasLocation(#20036,#20037)
+#20038=*
+exit_cfg_node(#20038,#20001)
+hasLocation(#20038,#20035)
+successor(#20004,#20038)
+#20039=*
+entry_cfg_node(#20039,#20004)
+hasLocation(#20039,#20037)
+#20040=*
+exit_cfg_node(#20040,#20004)
+#20041=@"loc,{#10000},1,20,1,19"
+locations_default(#20041,#10000,1,20,1,19)
+hasLocation(#20040,#20041)
+successor(#20016,#20040)
+successor(#20013,#20016)
+successor(#20010,#20013)
+successor(#20039,#20010)
+successor(#20006,#20004)
+successor(#20036,#20006)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/encoding/input/surrogates.js b/javascript/extractor/tests/encoding/input/surrogates.js
new file mode 100644
index 00000000000..12ff8b4993a
--- /dev/null
+++ b/javascript/extractor/tests/encoding/input/surrogates.js
@@ -0,0 +1,13 @@
+// lone surrogate halves
+'\ud800';
+'foo\ud800';
+'\ud800bar';
+'foo\ud800bar';
+/\uD800/;
+/foo\ud800/;
+/\ud800bar/;
+/foo\ud800bar/;
+// wrong order
+'\udc00\ud800';
+// OK
+'\uD834\uDF06';
diff --git a/javascript/extractor/tests/encoding/input/unicode.js b/javascript/extractor/tests/encoding/input/unicode.js
new file mode 100644
index 00000000000..2e943d98387
--- /dev/null
+++ b/javascript/extractor/tests/encoding/input/unicode.js
@@ -0,0 +1 @@
+"Semmlé"
\ No newline at end of file
diff --git a/javascript/extractor/tests/encoding/output/trap/surrogates.js.trap b/javascript/extractor/tests/encoding/output/trap/surrogates.js.trap
new file mode 100644
index 00000000000..a277e749213
--- /dev/null
+++ b/javascript/extractor/tests/encoding/output/trap/surrogates.js.trap
@@ -0,0 +1,453 @@
+#10000=@"/surrogates.js;sourcefile"
+files(#10000,"/surrogates.js","surrogates","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,14,0"
+locations_default(#20002,#10000,1,1,14,0)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"'\ud800';")
+#20004=@"loc,{#10000},2,1,2,9"
+locations_default(#20004,#10000,2,1,2,9)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,4,#20003,0,"'\ud800'")
+#20006=@"loc,{#10000},2,1,2,8"
+locations_default(#20006,#10000,2,1,2,8)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+literals("?","'\ud800'",#20005)
+#20007=*
+stmts(#20007,2,#20001,1,"'foo\ud800';")
+#20008=@"loc,{#10000},3,1,3,12"
+locations_default(#20008,#10000,3,1,3,12)
+hasLocation(#20007,#20008)
+stmtContainers(#20007,#20001)
+#20009=*
+exprs(#20009,4,#20007,0,"'foo\ud800'")
+#20010=@"loc,{#10000},3,1,3,11"
+locations_default(#20010,#10000,3,1,3,11)
+hasLocation(#20009,#20010)
+enclosingStmt(#20009,#20007)
+exprContainers(#20009,#20001)
+literals("foo?","'foo\ud800'",#20009)
+#20011=*
+stmts(#20011,2,#20001,2,"'\ud800bar';")
+#20012=@"loc,{#10000},4,1,4,12"
+locations_default(#20012,#10000,4,1,4,12)
+hasLocation(#20011,#20012)
+stmtContainers(#20011,#20001)
+#20013=*
+exprs(#20013,4,#20011,0,"'\ud800bar'")
+#20014=@"loc,{#10000},4,1,4,11"
+locations_default(#20014,#10000,4,1,4,11)
+hasLocation(#20013,#20014)
+enclosingStmt(#20013,#20011)
+exprContainers(#20013,#20001)
+literals("?bar","'\ud800bar'",#20013)
+#20015=*
+stmts(#20015,2,#20001,3,"'foo\ud800bar';")
+#20016=@"loc,{#10000},5,1,5,15"
+locations_default(#20016,#10000,5,1,5,15)
+hasLocation(#20015,#20016)
+stmtContainers(#20015,#20001)
+#20017=*
+exprs(#20017,4,#20015,0,"'foo\ud800bar'")
+#20018=@"loc,{#10000},5,1,5,14"
+locations_default(#20018,#10000,5,1,5,14)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20015)
+exprContainers(#20017,#20001)
+literals("foo?bar","'foo\ud800bar'",#20017)
+#20019=*
+stmts(#20019,2,#20001,4,"/\uD800/;")
+#20020=@"loc,{#10000},6,1,6,9"
+locations_default(#20020,#10000,6,1,6,9)
+hasLocation(#20019,#20020)
+stmtContainers(#20019,#20001)
+#20021=*
+exprs(#20021,5,#20019,0,"/\uD800/")
+#20022=@"loc,{#10000},6,1,6,8"
+locations_default(#20022,#10000,6,1,6,8)
+hasLocation(#20021,#20022)
+enclosingStmt(#20021,#20019)
+exprContainers(#20021,#20001)
+literals("/\uD800/","/\uD800/",#20021)
+#20023=*
+regexpterm(#20023,16,#20021,0,"\uD800")
+#20024=@"loc,{#10000},6,2,6,7"
+locations_default(#20024,#10000,6,2,6,7)
+hasLocation(#20023,#20024)
+regexpConstValue(#20023,"?")
+#20025=*
+stmts(#20025,2,#20001,5,"/foo\ud800/;")
+#20026=@"loc,{#10000},7,1,7,12"
+locations_default(#20026,#10000,7,1,7,12)
+hasLocation(#20025,#20026)
+stmtContainers(#20025,#20001)
+#20027=*
+exprs(#20027,5,#20025,0,"/foo\ud800/")
+#20028=@"loc,{#10000},7,1,7,11"
+locations_default(#20028,#10000,7,1,7,11)
+hasLocation(#20027,#20028)
+enclosingStmt(#20027,#20025)
+exprContainers(#20027,#20001)
+literals("/foo\ud800/","/foo\ud800/",#20027)
+#20029=*
+regexpterm(#20029,1,#20027,0,"foo\ud800")
+#20030=@"loc,{#10000},7,2,7,10"
+locations_default(#20030,#10000,7,2,7,10)
+hasLocation(#20029,#20030)
+#20031=*
+regexpterm(#20031,14,#20029,0,"f")
+#20032=@"loc,{#10000},7,2,7,2"
+locations_default(#20032,#10000,7,2,7,2)
+hasLocation(#20031,#20032)
+regexpConstValue(#20031,"f")
+#20033=*
+regexpterm(#20033,14,#20029,1,"o")
+#20034=@"loc,{#10000},7,3,7,3"
+locations_default(#20034,#10000,7,3,7,3)
+hasLocation(#20033,#20034)
+regexpConstValue(#20033,"o")
+#20035=*
+regexpterm(#20035,14,#20029,2,"o")
+#20036=@"loc,{#10000},7,4,7,4"
+locations_default(#20036,#10000,7,4,7,4)
+hasLocation(#20035,#20036)
+regexpConstValue(#20035,"o")
+#20037=*
+regexpterm(#20037,16,#20029,3,"\ud800")
+#20038=@"loc,{#10000},7,5,7,10"
+locations_default(#20038,#10000,7,5,7,10)
+hasLocation(#20037,#20038)
+regexpConstValue(#20037,"?")
+#20039=*
+stmts(#20039,2,#20001,6,"/\ud800bar/;")
+#20040=@"loc,{#10000},8,1,8,12"
+locations_default(#20040,#10000,8,1,8,12)
+hasLocation(#20039,#20040)
+stmtContainers(#20039,#20001)
+#20041=*
+exprs(#20041,5,#20039,0,"/\ud800bar/")
+#20042=@"loc,{#10000},8,1,8,11"
+locations_default(#20042,#10000,8,1,8,11)
+hasLocation(#20041,#20042)
+enclosingStmt(#20041,#20039)
+exprContainers(#20041,#20001)
+literals("/\ud800bar/","/\ud800bar/",#20041)
+#20043=*
+regexpterm(#20043,1,#20041,0,"\ud800bar")
+#20044=@"loc,{#10000},8,2,8,10"
+locations_default(#20044,#10000,8,2,8,10)
+hasLocation(#20043,#20044)
+#20045=*
+regexpterm(#20045,16,#20043,0,"\ud800")
+#20046=@"loc,{#10000},8,2,8,7"
+locations_default(#20046,#10000,8,2,8,7)
+hasLocation(#20045,#20046)
+regexpConstValue(#20045,"?")
+#20047=*
+regexpterm(#20047,14,#20043,1,"b")
+#20048=@"loc,{#10000},8,8,8,8"
+locations_default(#20048,#10000,8,8,8,8)
+hasLocation(#20047,#20048)
+regexpConstValue(#20047,"b")
+#20049=*
+regexpterm(#20049,14,#20043,2,"a")
+#20050=@"loc,{#10000},8,9,8,9"
+locations_default(#20050,#10000,8,9,8,9)
+hasLocation(#20049,#20050)
+regexpConstValue(#20049,"a")
+#20051=*
+regexpterm(#20051,14,#20043,3,"r")
+#20052=@"loc,{#10000},8,10,8,10"
+locations_default(#20052,#10000,8,10,8,10)
+hasLocation(#20051,#20052)
+regexpConstValue(#20051,"r")
+#20053=*
+stmts(#20053,2,#20001,7,"/foo\ud800bar/;")
+#20054=@"loc,{#10000},9,1,9,15"
+locations_default(#20054,#10000,9,1,9,15)
+hasLocation(#20053,#20054)
+stmtContainers(#20053,#20001)
+#20055=*
+exprs(#20055,5,#20053,0,"/foo\ud800bar/")
+#20056=@"loc,{#10000},9,1,9,14"
+locations_default(#20056,#10000,9,1,9,14)
+hasLocation(#20055,#20056)
+enclosingStmt(#20055,#20053)
+exprContainers(#20055,#20001)
+literals("/foo\ud800bar/","/foo\ud800bar/",#20055)
+#20057=*
+regexpterm(#20057,1,#20055,0,"foo\ud800bar")
+#20058=@"loc,{#10000},9,2,9,13"
+locations_default(#20058,#10000,9,2,9,13)
+hasLocation(#20057,#20058)
+#20059=*
+regexpterm(#20059,14,#20057,0,"f")
+#20060=@"loc,{#10000},9,2,9,2"
+locations_default(#20060,#10000,9,2,9,2)
+hasLocation(#20059,#20060)
+regexpConstValue(#20059,"f")
+#20061=*
+regexpterm(#20061,14,#20057,1,"o")
+#20062=@"loc,{#10000},9,3,9,3"
+locations_default(#20062,#10000,9,3,9,3)
+hasLocation(#20061,#20062)
+regexpConstValue(#20061,"o")
+#20063=*
+regexpterm(#20063,14,#20057,2,"o")
+#20064=@"loc,{#10000},9,4,9,4"
+locations_default(#20064,#10000,9,4,9,4)
+hasLocation(#20063,#20064)
+regexpConstValue(#20063,"o")
+#20065=*
+regexpterm(#20065,16,#20057,3,"\ud800")
+#20066=@"loc,{#10000},9,5,9,10"
+locations_default(#20066,#10000,9,5,9,10)
+hasLocation(#20065,#20066)
+regexpConstValue(#20065,"?")
+#20067=*
+regexpterm(#20067,14,#20057,4,"b")
+#20068=@"loc,{#10000},9,11,9,11"
+locations_default(#20068,#10000,9,11,9,11)
+hasLocation(#20067,#20068)
+regexpConstValue(#20067,"b")
+#20069=*
+regexpterm(#20069,14,#20057,5,"a")
+#20070=@"loc,{#10000},9,12,9,12"
+locations_default(#20070,#10000,9,12,9,12)
+hasLocation(#20069,#20070)
+regexpConstValue(#20069,"a")
+#20071=*
+regexpterm(#20071,14,#20057,6,"r")
+#20072=@"loc,{#10000},9,13,9,13"
+locations_default(#20072,#10000,9,13,9,13)
+hasLocation(#20071,#20072)
+regexpConstValue(#20071,"r")
+#20073=*
+stmts(#20073,2,#20001,8,"'\udc00\ud800';")
+#20074=@"loc,{#10000},11,1,11,15"
+locations_default(#20074,#10000,11,1,11,15)
+hasLocation(#20073,#20074)
+stmtContainers(#20073,#20001)
+#20075=*
+exprs(#20075,4,#20073,0,"'\udc00\ud800'")
+#20076=@"loc,{#10000},11,1,11,14"
+locations_default(#20076,#10000,11,1,11,14)
+hasLocation(#20075,#20076)
+enclosingStmt(#20075,#20073)
+exprContainers(#20075,#20001)
+literals("??","'\udc00\ud800'",#20075)
+#20077=*
+stmts(#20077,2,#20001,9,"'\uD834\uDF06';")
+#20078=@"loc,{#10000},13,1,13,15"
+locations_default(#20078,#10000,13,1,13,15)
+hasLocation(#20077,#20078)
+stmtContainers(#20077,#20001)
+#20079=*
+exprs(#20079,4,#20077,0,"'\uD834\uDF06'")
+#20080=@"loc,{#10000},13,1,13,14"
+locations_default(#20080,#10000,13,1,13,14)
+hasLocation(#20079,#20080)
+enclosingStmt(#20079,#20077)
+exprContainers(#20079,#20001)
+literals("�","'\uD834\uDF06'",#20079)
+#20081=*
+comments(#20081,0,#20001," lone surrogate halves","// lone ...  halves")
+#20082=@"loc,{#10000},1,1,1,24"
+locations_default(#20082,#10000,1,1,1,24)
+hasLocation(#20081,#20082)
+#20083=*
+comments(#20083,0,#20001," wrong order","// wrong order")
+#20084=@"loc,{#10000},10,1,10,14"
+locations_default(#20084,#10000,10,1,10,14)
+hasLocation(#20083,#20084)
+#20085=*
+comments(#20085,0,#20001," OK","// OK")
+#20086=@"loc,{#10000},12,1,12,5"
+locations_default(#20086,#10000,12,1,12,5)
+hasLocation(#20085,#20086)
+#20087=*
+lines(#20087,#20001,"// lone surrogate halves","
+")
+hasLocation(#20087,#20082)
+#20088=*
+lines(#20088,#20001,"'\ud800';","
+")
+hasLocation(#20088,#20004)
+#20089=*
+lines(#20089,#20001,"'foo\ud800';","
+")
+hasLocation(#20089,#20008)
+#20090=*
+lines(#20090,#20001,"'\ud800bar';","
+")
+hasLocation(#20090,#20012)
+#20091=*
+lines(#20091,#20001,"'foo\ud800bar';","
+")
+hasLocation(#20091,#20016)
+#20092=*
+lines(#20092,#20001,"/\uD800/;","
+")
+hasLocation(#20092,#20020)
+#20093=*
+lines(#20093,#20001,"/foo\ud800/;","
+")
+hasLocation(#20093,#20026)
+#20094=*
+lines(#20094,#20001,"/\ud800bar/;","
+")
+hasLocation(#20094,#20040)
+#20095=*
+lines(#20095,#20001,"/foo\ud800bar/;","
+")
+hasLocation(#20095,#20054)
+#20096=*
+lines(#20096,#20001,"// wrong order","
+")
+hasLocation(#20096,#20084)
+#20097=*
+lines(#20097,#20001,"'\udc00\ud800';","
+")
+hasLocation(#20097,#20074)
+#20098=*
+lines(#20098,#20001,"// OK","
+")
+hasLocation(#20098,#20086)
+#20099=*
+lines(#20099,#20001,"'\uD834\uDF06';","
+")
+hasLocation(#20099,#20078)
+numlines(#20001,13,10,3)
+#20100=*
+tokeninfo(#20100,4,#20001,0,"'\ud800'")
+hasLocation(#20100,#20006)
+next_token(#20081,#20100)
+#20101=*
+tokeninfo(#20101,8,#20001,1,";")
+#20102=@"loc,{#10000},2,9,2,9"
+locations_default(#20102,#10000,2,9,2,9)
+hasLocation(#20101,#20102)
+#20103=*
+tokeninfo(#20103,4,#20001,2,"'foo\ud800'")
+hasLocation(#20103,#20010)
+#20104=*
+tokeninfo(#20104,8,#20001,3,";")
+#20105=@"loc,{#10000},3,12,3,12"
+locations_default(#20105,#10000,3,12,3,12)
+hasLocation(#20104,#20105)
+#20106=*
+tokeninfo(#20106,4,#20001,4,"'\ud800bar'")
+hasLocation(#20106,#20014)
+#20107=*
+tokeninfo(#20107,8,#20001,5,";")
+#20108=@"loc,{#10000},4,12,4,12"
+locations_default(#20108,#10000,4,12,4,12)
+hasLocation(#20107,#20108)
+#20109=*
+tokeninfo(#20109,4,#20001,6,"'foo\ud800bar'")
+hasLocation(#20109,#20018)
+#20110=*
+tokeninfo(#20110,8,#20001,7,";")
+#20111=@"loc,{#10000},5,15,5,15"
+locations_default(#20111,#10000,5,15,5,15)
+hasLocation(#20110,#20111)
+#20112=*
+tokeninfo(#20112,5,#20001,8,"/\uD800/")
+hasLocation(#20112,#20022)
+#20113=*
+tokeninfo(#20113,8,#20001,9,";")
+#20114=@"loc,{#10000},6,9,6,9"
+locations_default(#20114,#10000,6,9,6,9)
+hasLocation(#20113,#20114)
+#20115=*
+tokeninfo(#20115,5,#20001,10,"/foo\ud800/")
+hasLocation(#20115,#20028)
+#20116=*
+tokeninfo(#20116,8,#20001,11,";")
+#20117=@"loc,{#10000},7,12,7,12"
+locations_default(#20117,#10000,7,12,7,12)
+hasLocation(#20116,#20117)
+#20118=*
+tokeninfo(#20118,5,#20001,12,"/\ud800bar/")
+hasLocation(#20118,#20042)
+#20119=*
+tokeninfo(#20119,8,#20001,13,";")
+#20120=@"loc,{#10000},8,12,8,12"
+locations_default(#20120,#10000,8,12,8,12)
+hasLocation(#20119,#20120)
+#20121=*
+tokeninfo(#20121,5,#20001,14,"/foo\ud800bar/")
+hasLocation(#20121,#20056)
+#20122=*
+tokeninfo(#20122,8,#20001,15,";")
+#20123=@"loc,{#10000},9,15,9,15"
+locations_default(#20123,#10000,9,15,9,15)
+hasLocation(#20122,#20123)
+#20124=*
+tokeninfo(#20124,4,#20001,16,"'\udc00\ud800'")
+hasLocation(#20124,#20076)
+next_token(#20083,#20124)
+#20125=*
+tokeninfo(#20125,8,#20001,17,";")
+#20126=@"loc,{#10000},11,15,11,15"
+locations_default(#20126,#10000,11,15,11,15)
+hasLocation(#20125,#20126)
+#20127=*
+tokeninfo(#20127,4,#20001,18,"'\uD834\uDF06'")
+hasLocation(#20127,#20080)
+next_token(#20085,#20127)
+#20128=*
+tokeninfo(#20128,8,#20001,19,";")
+#20129=@"loc,{#10000},13,15,13,15"
+locations_default(#20129,#10000,13,15,13,15)
+hasLocation(#20128,#20129)
+#20130=*
+tokeninfo(#20130,0,#20001,20,"")
+#20131=@"loc,{#10000},14,1,14,0"
+locations_default(#20131,#10000,14,1,14,0)
+hasLocation(#20130,#20131)
+#20132=*
+entry_cfg_node(#20132,#20001)
+#20133=@"loc,{#10000},1,1,1,0"
+locations_default(#20133,#10000,1,1,1,0)
+hasLocation(#20132,#20133)
+#20134=*
+exit_cfg_node(#20134,#20001)
+hasLocation(#20134,#20131)
+successor(#20077,#20079)
+successor(#20079,#20134)
+successor(#20073,#20075)
+successor(#20075,#20077)
+successor(#20053,#20055)
+successor(#20055,#20073)
+successor(#20039,#20041)
+successor(#20041,#20053)
+successor(#20025,#20027)
+successor(#20027,#20039)
+successor(#20019,#20021)
+successor(#20021,#20025)
+successor(#20015,#20017)
+successor(#20017,#20019)
+successor(#20011,#20013)
+successor(#20013,#20015)
+successor(#20007,#20009)
+successor(#20009,#20011)
+successor(#20003,#20005)
+successor(#20005,#20007)
+successor(#20132,#20003)
+numlines(#10000,13,10,3)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/encoding/output/trap/unicode.js.trap b/javascript/extractor/tests/encoding/output/trap/unicode.js.trap
new file mode 100644
index 00000000000..a264d715a00
--- /dev/null
+++ b/javascript/extractor/tests/encoding/output/trap/unicode.js.trap
@@ -0,0 +1,50 @@
+#10000=@"/unicode.js;sourcefile"
+files(#10000,"/unicode.js","unicode","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,8"
+locations_default(#20002,#10000,1,1,1,8)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"""Semml\u00e9""")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,4,#20003,0,"""Semml\u00e9""")
+hasLocation(#20004,#20002)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+literals("Semmlé","""Semmlé""",#20004)
+#20005=*
+lines(#20005,#20001,"""Semmlé""","")
+hasLocation(#20005,#20002)
+numlines(#20001,1,1,0)
+#20006=*
+tokeninfo(#20006,4,#20001,0,"""Semmlé""")
+hasLocation(#20006,#20002)
+#20007=*
+tokeninfo(#20007,0,#20001,1,"")
+#20008=@"loc,{#10000},1,9,1,8"
+locations_default(#20008,#10000,1,9,1,8)
+hasLocation(#20007,#20008)
+#20009=*
+entry_cfg_node(#20009,#20001)
+#20010=@"loc,{#10000},1,1,1,0"
+locations_default(#20010,#10000,1,1,1,0)
+hasLocation(#20009,#20010)
+#20011=*
+exit_cfg_node(#20011,#20001)
+hasLocation(#20011,#20008)
+successor(#20003,#20004)
+successor(#20004,#20011)
+successor(#20009,#20003)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/errors/input/empty.js b/javascript/extractor/tests/errors/input/empty.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/javascript/extractor/tests/errors/input/errors.js b/javascript/extractor/tests/errors/input/errors.js
new file mode 100644
index 00000000000..d4b710ab0bc
--- /dev/null
+++ b/javascript/extractor/tests/errors/input/errors.js
@@ -0,0 +1 @@
+hi~~
\ No newline at end of file
diff --git a/javascript/extractor/tests/errors/input/incomplete.js b/javascript/extractor/tests/errors/input/incomplete.js
new file mode 100644
index 00000000000..e45ee6a0a2e
--- /dev/null
+++ b/javascript/extractor/tests/errors/input/incomplete.js
@@ -0,0 +1 @@
+if (b) {
diff --git a/javascript/extractor/tests/errors/input/json.js b/javascript/extractor/tests/errors/input/json.js
new file mode 100644
index 00000000000..8a6a12ea4e2
--- /dev/null
+++ b/javascript/extractor/tests/errors/input/json.js
@@ -0,0 +1,3 @@
+{
+  "a": 42
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/errors/input/weirdassign.js b/javascript/extractor/tests/errors/input/weirdassign.js
new file mode 100644
index 00000000000..65f256265af
--- /dev/null
+++ b/javascript/extractor/tests/errors/input/weirdassign.js
@@ -0,0 +1 @@
+a %*= 1
\ No newline at end of file
diff --git a/javascript/extractor/tests/errors/output/trap/empty.js.trap b/javascript/extractor/tests/errors/output/trap/empty.js.trap
new file mode 100644
index 00000000000..356a53c1f80
--- /dev/null
+++ b/javascript/extractor/tests/errors/output/trap/empty.js.trap
@@ -0,0 +1,28 @@
+#10000=@"/empty.js;sourcefile"
+files(#10000,"/empty.js","empty","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,0"
+locations_default(#20002,#10000,1,1,1,0)
+hasLocation(#20001,#20002)
+numlines(#20001,0,0,0)
+#20003=*
+tokeninfo(#20003,0,#20001,0,"")
+hasLocation(#20003,#20002)
+#20004=*
+entry_cfg_node(#20004,#20001)
+hasLocation(#20004,#20002)
+#20005=*
+exit_cfg_node(#20005,#20001)
+hasLocation(#20005,#20002)
+successor(#20004,#20005)
+numlines(#10000,0,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/errors/output/trap/errors.js.trap b/javascript/extractor/tests/errors/output/trap/errors.js.trap
new file mode 100644
index 00000000000..e5afaf5044a
--- /dev/null
+++ b/javascript/extractor/tests/errors/output/trap/errors.js.trap
@@ -0,0 +1,28 @@
+#10000=@"/errors.js;sourcefile"
+files(#10000,"/errors.js","errors","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unexpected token","hi~~")
+#20004=@"loc,{#10000},1,3,1,3"
+locations_default(#20004,#10000,1,3,1,3)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"hi~~","")
+#20006=@"loc,{#10000},1,1,1,4"
+locations_default(#20006,#10000,1,1,1,4)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/errors/output/trap/incomplete.js.trap b/javascript/extractor/tests/errors/output/trap/incomplete.js.trap
new file mode 100644
index 00000000000..84bd91ea037
--- /dev/null
+++ b/javascript/extractor/tests/errors/output/trap/incomplete.js.trap
@@ -0,0 +1,27 @@
+#10000=@"/incomplete.js;sourcefile"
+files(#10000,"/incomplete.js","incomplete","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unexpected token","")
+hasLocation(#20003,#20002)
+#20004=*
+lines(#20004,#20001,"if (b) {","
+")
+#20005=@"loc,{#10000},1,1,1,8"
+locations_default(#20005,#10000,1,1,1,8)
+hasLocation(#20004,#20005)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/errors/output/trap/json.js.trap b/javascript/extractor/tests/errors/output/trap/json.js.trap
new file mode 100644
index 00000000000..b8381dd7925
--- /dev/null
+++ b/javascript/extractor/tests/errors/output/trap/json.js.trap
@@ -0,0 +1,24 @@
+#10000=@"/json.js;sourcefile"
+files(#10000,"/json.js","json","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+json(#20001,5,#10000,0,"{\n  ""a"": 42\n}")
+#20002=@"loc,{#10000},1,1,3,1"
+locations_default(#20002,#10000,1,1,3,1)
+hasLocation(#20001,#20002)
+#20003=*
+json(#20003,2,#20001,0,"42")
+#20004=@"loc,{#10000},2,8,2,9"
+locations_default(#20004,#10000,2,8,2,9)
+hasLocation(#20003,#20004)
+json_literals("42","42",#20003)
+json_properties(#20001,"a",#20003)
+numlines(#10000,3,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/errors/output/trap/weirdassign.js.trap b/javascript/extractor/tests/errors/output/trap/weirdassign.js.trap
new file mode 100644
index 00000000000..c768fdecdbf
--- /dev/null
+++ b/javascript/extractor/tests/errors/output/trap/weirdassign.js.trap
@@ -0,0 +1,28 @@
+#10000=@"/weirdassign.js;sourcefile"
+files(#10000,"/weirdassign.js","weirdassign","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unexpected token","a %*= 1")
+#20004=@"loc,{#10000},1,4,1,4"
+locations_default(#20004,#10000,1,4,1,4)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"a %*= 1","")
+#20006=@"loc,{#10000},1,1,1,7"
+locations_default(#20006,#10000,1,1,1,7)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/es2015/input/array_pattern_with_default.js b/javascript/extractor/tests/es2015/input/array_pattern_with_default.js
new file mode 100644
index 00000000000..f994e073f58
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/array_pattern_with_default.js
@@ -0,0 +1 @@
+[x=42] = [];
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/array_pattern_with_rest.js b/javascript/extractor/tests/es2015/input/array_pattern_with_rest.js
new file mode 100644
index 00000000000..2d029f541f1
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/array_pattern_with_rest.js
@@ -0,0 +1,4 @@
+function cdr(o) {
+  var [, ...ys] = o;
+  return ys;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/arrowfn.js b/javascript/extractor/tests/es2015/input/arrowfn.js
new file mode 100644
index 00000000000..34dbd816331
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/arrowfn.js
@@ -0,0 +1,3 @@
+["a", "ab", "abc"].map(s => s.length);
+setInterval(() => ++cnt, 1000);
+setTimeout(() => { alert("Wake up!"); }, 60000);
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_accessors.js b/javascript/extractor/tests/es2015/input/class_accessors.js
new file mode 100644
index 00000000000..a9f030fdadf
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_accessors.js
@@ -0,0 +1,8 @@
+class A {
+  get x() {
+    return this._x;
+  }
+  set x(v) {
+    this._x = +v;
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_ctor.js b/javascript/extractor/tests/es2015/input/class_ctor.js
new file mode 100644
index 00000000000..5caff3b5cc8
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_ctor.js
@@ -0,0 +1,5 @@
+class A {
+  constructor(x) {
+    this.x = x;
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_extends.js b/javascript/extractor/tests/es2015/input/class_extends.js
new file mode 100644
index 00000000000..690e5e58cbc
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_extends.js
@@ -0,0 +1 @@
+class Point extends Object {}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_extends2.js b/javascript/extractor/tests/es2015/input/class_extends2.js
new file mode 100644
index 00000000000..6581dc62c19
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_extends2.js
@@ -0,0 +1 @@
+class Point extends (Math.random() ? Object : Array) {}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_method.js b/javascript/extractor/tests/es2015/input/class_method.js
new file mode 100644
index 00000000000..3fc2edf9bb8
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_method.js
@@ -0,0 +1,5 @@
+class A {
+  getX() {
+    return this.x;
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/class_static.js b/javascript/extractor/tests/es2015/input/class_static.js
new file mode 100644
index 00000000000..0b38ac7512e
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/class_static.js
@@ -0,0 +1,5 @@
+class A {
+  static className() {
+    return "A";
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/classdecl.js b/javascript/extractor/tests/es2015/input/classdecl.js
new file mode 100644
index 00000000000..bbdacc85cea
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/classdecl.js
@@ -0,0 +1 @@
+class Point {}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/classexpr.js b/javascript/extractor/tests/es2015/input/classexpr.js
new file mode 100644
index 00000000000..82793bca968
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/classexpr.js
@@ -0,0 +1 @@
+(class Point {})
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/classexpr2.js b/javascript/extractor/tests/es2015/input/classexpr2.js
new file mode 100644
index 00000000000..9c4da410651
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/classexpr2.js
@@ -0,0 +1 @@
+(class       {})
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/complex_array_pattern.js b/javascript/extractor/tests/es2015/input/complex_array_pattern.js
new file mode 100644
index 00000000000..ab2cfa77cbe
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/complex_array_pattern.js
@@ -0,0 +1 @@
+[o.x] = [42];
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/complex_object_pattern.js b/javascript/extractor/tests/es2015/input/complex_object_pattern.js
new file mode 100644
index 00000000000..1463e6aa17f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/complex_object_pattern.js
@@ -0,0 +1 @@
+({ x: o.x } = q);
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/const.js b/javascript/extractor/tests/es2015/input/const.js
new file mode 100644
index 00000000000..3f6a49b23d5
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/const.js
@@ -0,0 +1 @@
+const x = 23;
diff --git a/javascript/extractor/tests/es2015/input/defaultargs.js b/javascript/extractor/tests/es2015/input/defaultargs.js
new file mode 100644
index 00000000000..a9568a2dfbb
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/defaultargs.js
@@ -0,0 +1 @@
+function f(x, y=x+19) {}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/delegating_yield.js b/javascript/extractor/tests/es2015/input/delegating_yield.js
new file mode 100644
index 00000000000..a2c997956d0
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/delegating_yield.js
@@ -0,0 +1,3 @@
+function* f() {
+    yield* g();
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/destructuring.js b/javascript/extractor/tests/es2015/input/destructuring.js
new file mode 100644
index 00000000000..a9550055563
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/destructuring.js
@@ -0,0 +1,13 @@
+function f([x, y]) {
+	var [a, [, c]] = x;
+	try {
+		throw [a, c];
+	} catch (d) {
+		console.log(d);
+	}
+}
+
+function g({ x, y: z }) {
+	var { [x]: w } = z;
+	return w;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export1.js b/javascript/extractor/tests/es2015/input/export1.js
new file mode 100644
index 00000000000..7d1c0b20ba2
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export1.js
@@ -0,0 +1 @@
+export var x = 23;
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export10.js b/javascript/extractor/tests/es2015/input/export10.js
new file mode 100644
index 00000000000..81d540ae9be
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export10.js
@@ -0,0 +1 @@
+export default function f () {} [,]
diff --git a/javascript/extractor/tests/es2015/input/export11.js b/javascript/extractor/tests/es2015/input/export11.js
new file mode 100644
index 00000000000..a6e68e98389
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export11.js
@@ -0,0 +1 @@
+export default class {}
diff --git a/javascript/extractor/tests/es2015/input/export2.js b/javascript/extractor/tests/es2015/input/export2.js
new file mode 100644
index 00000000000..3ed5869c845
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export2.js
@@ -0,0 +1 @@
+export function f() {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export3.js b/javascript/extractor/tests/es2015/input/export3.js
new file mode 100644
index 00000000000..a2e9fed4086
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export3.js
@@ -0,0 +1 @@
+export default function f() {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export4.js b/javascript/extractor/tests/es2015/input/export4.js
new file mode 100644
index 00000000000..0cb726be328
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export4.js
@@ -0,0 +1 @@
+export default function () {};
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export5.js b/javascript/extractor/tests/es2015/input/export5.js
new file mode 100644
index 00000000000..1c5d16dc319
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export5.js
@@ -0,0 +1,2 @@
+var x = 23, y = 42;
+export { x, y as z };
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export6.js b/javascript/extractor/tests/es2015/input/export6.js
new file mode 100644
index 00000000000..4fc6cbc015f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export6.js
@@ -0,0 +1 @@
+export * from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export7.js b/javascript/extractor/tests/es2015/input/export7.js
new file mode 100644
index 00000000000..4f4676a7f78
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export7.js
@@ -0,0 +1 @@
+export { x, y as z } from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export8.js b/javascript/extractor/tests/es2015/input/export8.js
new file mode 100644
index 00000000000..5795b714b3e
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export8.js
@@ -0,0 +1,2 @@
+foo = 42;
+export default foo;
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/export9.js b/javascript/extractor/tests/es2015/input/export9.js
new file mode 100644
index 00000000000..cb38bd82cd6
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/export9.js
@@ -0,0 +1 @@
+export default class C {} [,]
diff --git a/javascript/extractor/tests/es2015/input/forof.js b/javascript/extractor/tests/es2015/input/forof.js
new file mode 100644
index 00000000000..748a617c97c
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/forof.js
@@ -0,0 +1,7 @@
+for (let x of [1,2,3]) {
+    let y = x+1;
+}
+
+function f() {
+    for (var x of []);
+}
diff --git a/javascript/extractor/tests/es2015/input/import1.js b/javascript/extractor/tests/es2015/input/import1.js
new file mode 100644
index 00000000000..4205bd1742e
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import1.js
@@ -0,0 +1 @@
+import x from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import2.js b/javascript/extractor/tests/es2015/input/import2.js
new file mode 100644
index 00000000000..125ddd489d6
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import2.js
@@ -0,0 +1 @@
+import { y } from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import3.js b/javascript/extractor/tests/es2015/input/import3.js
new file mode 100644
index 00000000000..4a8f61ce809
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import3.js
@@ -0,0 +1 @@
+import { y as z } from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import4.js b/javascript/extractor/tests/es2015/input/import4.js
new file mode 100644
index 00000000000..8c5a33aba7a
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import4.js
@@ -0,0 +1 @@
+import x, { y as z } from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import5.js b/javascript/extractor/tests/es2015/input/import5.js
new file mode 100644
index 00000000000..f86b4bb81e4
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import5.js
@@ -0,0 +1 @@
+import * as foo from 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import6.js b/javascript/extractor/tests/es2015/input/import6.js
new file mode 100644
index 00000000000..02155a9c1fd
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import6.js
@@ -0,0 +1 @@
+import 'foo';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/import7.js b/javascript/extractor/tests/es2015/input/import7.js
new file mode 100644
index 00000000000..fbabae2ab93
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/import7.js
@@ -0,0 +1,3 @@
+import x from 'foo';
+import 'bar';
+import { y as z } from 'baz';
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/let.js b/javascript/extractor/tests/es2015/input/let.js
new file mode 100644
index 00000000000..de994a4c635
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/let.js
@@ -0,0 +1,12 @@
+{
+    let x = 23;
+    {
+        let x = 42;
+        for (let x = x-19; x<42;) {
+            let x = 56;
+            console.log(x);
+        }
+        for (let x in { x: x })
+            x;
+    }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/let2.js b/javascript/extractor/tests/es2015/input/let2.js
new file mode 100644
index 00000000000..6cfa07b7b4a
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/let2.js
@@ -0,0 +1 @@
+let /* **/ x = 42;
diff --git a/javascript/extractor/tests/es2015/input/nested_import.js b/javascript/extractor/tests/es2015/input/nested_import.js
new file mode 100644
index 00000000000..8726289cd31
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/nested_import.js
@@ -0,0 +1,5 @@
+import { x } from 'm';
+if (!x) {
+  import { y } from 'm';
+  x = y;
+}
diff --git a/javascript/extractor/tests/es2015/input/new_target.js b/javascript/extractor/tests/es2015/input/new_target.js
new file mode 100644
index 00000000000..e8b7da37e37
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/new_target.js
@@ -0,0 +1,3 @@
+function f() {
+  return !!new.target;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/no-substitution.js b/javascript/extractor/tests/es2015/input/no-substitution.js
new file mode 100644
index 00000000000..cf637de5885
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/no-substitution.js
@@ -0,0 +1 @@
+``
diff --git a/javascript/extractor/tests/es2015/input/nullMethodName.js b/javascript/extractor/tests/es2015/input/nullMethodName.js
new file mode 100644
index 00000000000..d4f11ac3388
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/nullMethodName.js
@@ -0,0 +1,3 @@
+class C {
+  set [null](v) { }
+}
diff --git a/javascript/extractor/tests/es2015/input/odasa-2593.js b/javascript/extractor/tests/es2015/input/odasa-2593.js
new file mode 100644
index 00000000000..88bbe024907
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/odasa-2593.js
@@ -0,0 +1,4 @@
+function test() {
+    arguments;
+    let (arguments);
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/properties.js b/javascript/extractor/tests/es2015/input/properties.js
new file mode 100644
index 00000000000..ffc5e7deb99
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/properties.js
@@ -0,0 +1,6 @@
+var x = 42,
+    o = {
+        ["prop" + Math.random()]: 23,
+        x,
+        m() { return 56; }
+    };
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/property_pattern_with_default.js b/javascript/extractor/tests/es2015/input/property_pattern_with_default.js
new file mode 100644
index 00000000000..44586cea06f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/property_pattern_with_default.js
@@ -0,0 +1 @@
+({x = 1}) => x;
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/restparms.js b/javascript/extractor/tests/es2015/input/restparms.js
new file mode 100644
index 00000000000..9a17224da97
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/restparms.js
@@ -0,0 +1,2 @@
+function f(x, ...ys) {
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/restparms2.js b/javascript/extractor/tests/es2015/input/restparms2.js
new file mode 100644
index 00000000000..068e9f8b712
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/restparms2.js
@@ -0,0 +1,2 @@
+function f(x, ...[y, z]) {
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/spreadelement.js b/javascript/extractor/tests/es2015/input/spreadelement.js
new file mode 100644
index 00000000000..78426a00d6c
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/spreadelement.js
@@ -0,0 +1,2 @@
+[a, ...as];
+new Array(...elts);
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/super_call.js b/javascript/extractor/tests/es2015/input/super_call.js
new file mode 100644
index 00000000000..455b7da65af
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/super_call.js
@@ -0,0 +1,5 @@
+class A extends B {
+  m() {
+    return super.m() + 19;
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/super_ctor.js b/javascript/extractor/tests/es2015/input/super_ctor.js
new file mode 100644
index 00000000000..7a3a3240983
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/super_ctor.js
@@ -0,0 +1,5 @@
+class A extends B {
+  constructor() {
+    super(42);
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/templates.js b/javascript/extractor/tests/es2015/input/templates.js
new file mode 100644
index 00000000000..bc818f707a7
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/templates.js
@@ -0,0 +1,8 @@
+function tag(strings, ...values) {
+  return "values: " + values.join(', ');
+}
+
+var x = 23;
+var y = 19;
+`${x} + ${y} = ${x + y}`;
+tag `${x} + ${y} = ${x + y}`;
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/unknown_meta_property.js b/javascript/extractor/tests/es2015/input/unknown_meta_property.js
new file mode 100644
index 00000000000..5fbb480b0b0
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/unknown_meta_property.js
@@ -0,0 +1,3 @@
+function g() {
+  new.source;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/yield.js b/javascript/extractor/tests/es2015/input/yield.js
new file mode 100644
index 00000000000..a8ef8a45e1f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/yield.js
@@ -0,0 +1,5 @@
+function* foo(){
+  var index = 0;
+  while(index <= 2) // when index reaches 2, yield's done will be true and its value will be undefined;
+    yield index++;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/es2015/input/yield2.js b/javascript/extractor/tests/es2015/input/yield2.js
new file mode 100644
index 00000000000..56feae25084
--- /dev/null
+++ b/javascript/extractor/tests/es2015/input/yield2.js
@@ -0,0 +1,3 @@
+function* f() {
+    yield;
+}
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new file mode 100644
index 00000000000..797f4e5d80b
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/array_pattern_with_default.js.trap
@@ -0,0 +1,128 @@
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new file mode 100644
index 00000000000..b1951e4ee50
--- /dev/null
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diff --git a/javascript/extractor/tests/es2015/output/trap/arrowfn.js.trap b/javascript/extractor/tests/es2015/output/trap/arrowfn.js.trap
new file mode 100644
index 00000000000..7ae4740d76c
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diff --git a/javascript/extractor/tests/es2015/output/trap/class_accessors.js.trap b/javascript/extractor/tests/es2015/output/trap/class_accessors.js.trap
new file mode 100644
index 00000000000..3fc1fbdf9c0
--- /dev/null
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new file mode 100644
index 00000000000..ce3d279f662
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index 00000000000..7f9806a2244
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diff --git a/javascript/extractor/tests/es2015/output/trap/classdecl.js.trap b/javascript/extractor/tests/es2015/output/trap/classdecl.js.trap
new file mode 100644
index 00000000000..ec9230e22e1
--- /dev/null
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new file mode 100644
index 00000000000..fe0b32e3e54
--- /dev/null
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new file mode 100644
index 00000000000..7a51af8a622
--- /dev/null
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new file mode 100644
index 00000000000..7734f8d2a5b
--- /dev/null
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diff --git a/javascript/extractor/tests/es2015/output/trap/destructuring.js.trap b/javascript/extractor/tests/es2015/output/trap/destructuring.js.trap
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index 00000000000..6cb3f6a28e1
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diff --git a/javascript/extractor/tests/es2015/output/trap/export10.js.trap b/javascript/extractor/tests/es2015/output/trap/export10.js.trap
new file mode 100644
index 00000000000..065c269c934
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export10.js.trap
@@ -0,0 +1,161 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export11.js.trap b/javascript/extractor/tests/es2015/output/trap/export11.js.trap
new file mode 100644
index 00000000000..29cda6f7a06
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export11.js.trap
@@ -0,0 +1,121 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export2.js.trap b/javascript/extractor/tests/es2015/output/trap/export2.js.trap
new file mode 100644
index 00000000000..87b7bc5c223
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export2.js.trap
@@ -0,0 +1,134 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export3.js.trap b/javascript/extractor/tests/es2015/output/trap/export3.js.trap
new file mode 100644
index 00000000000..1f8592dae57
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export3.js.trap
@@ -0,0 +1,139 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export4.js.trap b/javascript/extractor/tests/es2015/output/trap/export4.js.trap
new file mode 100644
index 00000000000..d9565ac80cc
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export4.js.trap
@@ -0,0 +1,126 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export5.js.trap b/javascript/extractor/tests/es2015/output/trap/export5.js.trap
new file mode 100644
index 00000000000..320b00886a8
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export5.js.trap
@@ -0,0 +1,242 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export6.js.trap b/javascript/extractor/tests/es2015/output/trap/export6.js.trap
new file mode 100644
index 00000000000..08c3d379b81
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export6.js.trap
@@ -0,0 +1,77 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export7.js.trap b/javascript/extractor/tests/es2015/output/trap/export7.js.trap
new file mode 100644
index 00000000000..f7a1c406d13
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export7.js.trap
@@ -0,0 +1,149 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export8.js.trap b/javascript/extractor/tests/es2015/output/trap/export8.js.trap
new file mode 100644
index 00000000000..458f5c098a9
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export8.js.trap
@@ -0,0 +1,131 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/export9.js.trap b/javascript/extractor/tests/es2015/output/trap/export9.js.trap
new file mode 100644
index 00000000000..99be90b75cd
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/export9.js.trap
@@ -0,0 +1,173 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/forof.js.trap b/javascript/extractor/tests/es2015/output/trap/forof.js.trap
new file mode 100644
index 00000000000..40ff88df586
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/forof.js.trap
@@ -0,0 +1,468 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import1.js.trap b/javascript/extractor/tests/es2015/output/trap/import1.js.trap
new file mode 100644
index 00000000000..8466f842d7b
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import1.js.trap
@@ -0,0 +1,100 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import2.js.trap b/javascript/extractor/tests/es2015/output/trap/import2.js.trap
new file mode 100644
index 00000000000..3fdc1d70488
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import2.js.trap
@@ -0,0 +1,116 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import3.js.trap b/javascript/extractor/tests/es2015/output/trap/import3.js.trap
new file mode 100644
index 00000000000..e42af4de913
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import3.js.trap
@@ -0,0 +1,128 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import4.js.trap b/javascript/extractor/tests/es2015/output/trap/import4.js.trap
new file mode 100644
index 00000000000..d4eb85a489c
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import4.js.trap
@@ -0,0 +1,162 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import5.js.trap b/javascript/extractor/tests/es2015/output/trap/import5.js.trap
new file mode 100644
index 00000000000..18b2128ef58
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import5.js.trap
@@ -0,0 +1,108 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import6.js.trap b/javascript/extractor/tests/es2015/output/trap/import6.js.trap
new file mode 100644
index 00000000000..76399b8698d
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import6.js.trap
@@ -0,0 +1,66 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/import7.js.trap b/javascript/extractor/tests/es2015/output/trap/import7.js.trap
new file mode 100644
index 00000000000..44f037a199f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/import7.js.trap
@@ -0,0 +1,228 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/let.js.trap b/javascript/extractor/tests/es2015/output/trap/let.js.trap
new file mode 100644
index 00000000000..c58b10d22e6
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/let.js.trap
@@ -0,0 +1,729 @@
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new file mode 100644
index 00000000000..2c924daf790
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new file mode 100644
index 00000000000..90606dcc709
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new file mode 100644
index 00000000000..f6b64a7fb1f
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/no-substitution.js.trap
@@ -0,0 +1,64 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/nullMethodName.js.trap b/javascript/extractor/tests/es2015/output/trap/nullMethodName.js.trap
new file mode 100644
index 00000000000..4aa441ed680
--- /dev/null
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diff --git a/javascript/extractor/tests/es2015/output/trap/odasa-2593.js.trap b/javascript/extractor/tests/es2015/output/trap/odasa-2593.js.trap
new file mode 100644
index 00000000000..ce24a10e76d
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/odasa-2593.js.trap
@@ -0,0 +1,204 @@
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diff --git a/javascript/extractor/tests/es2015/output/trap/properties.js.trap b/javascript/extractor/tests/es2015/output/trap/properties.js.trap
new file mode 100644
index 00000000000..9be4b97471c
--- /dev/null
+++ b/javascript/extractor/tests/es2015/output/trap/properties.js.trap
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index 00000000000..0c7b76ca778
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new file mode 100644
index 00000000000..10a16898dcf
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new file mode 100644
index 00000000000..a680f8a7a3f
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index 00000000000..0a498fda418
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index 00000000000..bbc99278571
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index 00000000000..15c536cfec4
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new file mode 100644
index 00000000000..995b9f42327
--- /dev/null
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new file mode 100644
index 00000000000..f1ccab63038
--- /dev/null
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\ No newline at end of file
diff --git a/javascript/extractor/tests/es2016/input/usestrict.js b/javascript/extractor/tests/es2016/input/usestrict.js
new file mode 100644
index 00000000000..7b48dda72f2
--- /dev/null
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@@ -0,0 +1 @@
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\ No newline at end of file
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new file mode 100644
index 00000000000..b767fb455bf
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new file mode 100644
index 00000000000..cb0a0d0b4bd
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new file mode 100644
index 00000000000..5c0df2d94fb
--- /dev/null
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new file mode 100644
index 00000000000..be7f6810098
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new file mode 100644
index 00000000000..afc6f3cb912
--- /dev/null
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new file mode 100644
index 00000000000..48f537b8784
--- /dev/null
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\ No newline at end of file
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new file mode 100644
index 00000000000..86e72d80866
--- /dev/null
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new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/es2017/options.json
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+}
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new file mode 100644
index 00000000000..c33f0af4812
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new file mode 100644
index 00000000000..dd9fae620e2
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diff --git a/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap b/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap
new file mode 100644
index 00000000000..cc3d7af00ad
--- /dev/null
+++ b/javascript/extractor/tests/es2017/output/trap/export-async-2.js.trap
@@ -0,0 +1,135 @@
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diff --git a/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap b/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap
new file mode 100644
index 00000000000..7b7b6079233
--- /dev/null
+++ b/javascript/extractor/tests/es2017/output/trap/invalid-async-fn.js.trap
@@ -0,0 +1,145 @@
+#10000=@"/invalid-async-fn.js;sourcefile"
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+#10001=@"/;folder"
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diff --git a/javascript/extractor/tests/es2017/output/trap/shorthand-prop-async.js.trap b/javascript/extractor/tests/es2017/output/trap/shorthand-prop-async.js.trap
new file mode 100644
index 00000000000..ca7d5b51006
--- /dev/null
+++ b/javascript/extractor/tests/es2017/output/trap/shorthand-prop-async.js.trap
@@ -0,0 +1,110 @@
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diff --git a/javascript/extractor/tests/es2018/input/templates.js b/javascript/extractor/tests/es2018/input/templates.js
new file mode 100644
index 00000000000..c5436cd1427
--- /dev/null
+++ b/javascript/extractor/tests/es2018/input/templates.js
@@ -0,0 +1,12 @@
+`foo`
+`foo\u25a0`
+`foo${bar}\u25a0`
+foo `\u25a0`
+foo `foo${bar}\u25a0`
+foo `\unicode`
+foo `foo${bar}\unicode`
+foo `\u`
+foo `\u{`
+foo `\u{abcdx`
+foo `\u{abcdx}`
+foo `\unicode\\`
diff --git a/javascript/extractor/tests/es2018/options.json b/javascript/extractor/tests/es2018/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/es2018/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/es2018/output/trap/templates.js.trap b/javascript/extractor/tests/es2018/output/trap/templates.js.trap
new file mode 100644
index 00000000000..f4f713473cd
--- /dev/null
+++ b/javascript/extractor/tests/es2018/output/trap/templates.js.trap
@@ -0,0 +1,804 @@
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diff --git a/javascript/extractor/tests/esnext/input/async-generators.js b/javascript/extractor/tests/esnext/input/async-generators.js
new file mode 100644
index 00000000000..c5f6177fc79
--- /dev/null
+++ b/javascript/extractor/tests/esnext/input/async-generators.js
@@ -0,0 +1,6 @@
+async function *foo() {
+}
+
+async function bar() {
+  for await(var x of foo());
+}
diff --git a/javascript/extractor/tests/esnext/input/catchGuardAndNoBinding.js b/javascript/extractor/tests/esnext/input/catchGuardAndNoBinding.js
new file mode 100644
index 00000000000..597eda58480
--- /dev/null
+++ b/javascript/extractor/tests/esnext/input/catchGuardAndNoBinding.js
@@ -0,0 +1,10 @@
+try {}
+catch (e if e instanceof TypeError) {}
+catch (e if e instanceof Error) {}
+catch {}
+
+try {}
+catch (e if e instanceof TypeError) {}
+catch (e if e instanceof Error) {}
+catch {}
+finally {}
diff --git a/javascript/extractor/tests/esnext/input/catchNoBinding.js b/javascript/extractor/tests/esnext/input/catchNoBinding.js
new file mode 100644
index 00000000000..23f2e4c5209
--- /dev/null
+++ b/javascript/extractor/tests/esnext/input/catchNoBinding.js
@@ -0,0 +1,5 @@
+try {
+	try {} catch {}
+} catch {
+	try {} catch {} finally {}
+}
diff --git a/javascript/extractor/tests/esnext/input/dynamic-import.js b/javascript/extractor/tests/esnext/input/dynamic-import.js
new file mode 100644
index 00000000000..8c396e8425b
--- /dev/null
+++ b/javascript/extractor/tests/esnext/input/dynamic-import.js
@@ -0,0 +1,3 @@
+import("m");
+b ? import("n") : {};
+import("o").then((o) => {});
diff --git a/javascript/extractor/tests/esnext/input/fields.js b/javascript/extractor/tests/esnext/input/fields.js
new file mode 100644
index 00000000000..fd0aa847228
--- /dev/null
+++ b/javascript/extractor/tests/esnext/input/fields.js
@@ -0,0 +1,11 @@
+class A {
+  x = new.target;
+}
+
+class B extends A {
+  y = super.x;
+}
+
+class C {
+  async;
+}
diff --git a/javascript/extractor/tests/esnext/options.json b/javascript/extractor/tests/esnext/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/esnext/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap b/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap
new file mode 100644
index 00000000000..394bf7d967d
--- /dev/null
+++ b/javascript/extractor/tests/esnext/output/trap/async-generators.js.trap
@@ -0,0 +1,333 @@
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diff --git a/javascript/extractor/tests/esnext/output/trap/catchGuardAndNoBinding.js.trap b/javascript/extractor/tests/esnext/output/trap/catchGuardAndNoBinding.js.trap
new file mode 100644
index 00000000000..f96395b0b44
--- /dev/null
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new file mode 100644
index 00000000000..4950424398f
--- /dev/null
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index 00000000000..ed1dd37705b
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new file mode 100644
index 00000000000..e84e9f8d8fe
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+#20085=@"loc,{#10000},6,1,6,14"
+locations_default(#20085,#10000,6,1,6,14)
+hasLocation(#20084,#20085)
+indentation(#10000,6," ",2)
+#20086=*
+lines(#20086,#20001,"}","
+")
+#20087=@"loc,{#10000},7,1,7,1"
+locations_default(#20087,#10000,7,1,7,1)
+hasLocation(#20086,#20087)
+#20088=*
+lines(#20088,#20001,"","
+")
+#20089=@"loc,{#10000},8,1,8,0"
+locations_default(#20089,#10000,8,1,8,0)
+hasLocation(#20088,#20089)
+#20090=*
+lines(#20090,#20001,"class C {","
+")
+#20091=@"loc,{#10000},9,1,9,9"
+locations_default(#20091,#10000,9,1,9,9)
+hasLocation(#20090,#20091)
+#20092=*
+lines(#20092,#20001,"  async;","
+")
+#20093=@"loc,{#10000},10,1,10,8"
+locations_default(#20093,#10000,10,1,10,8)
+hasLocation(#20092,#20093)
+indentation(#10000,10," ",2)
+#20094=*
+lines(#20094,#20001,"}","
+")
+#20095=@"loc,{#10000},11,1,11,1"
+locations_default(#20095,#10000,11,1,11,1)
+hasLocation(#20094,#20095)
+numlines(#20001,11,9,0)
+#20096=*
+tokeninfo(#20096,7,#20001,0,"class")
+#20097=@"loc,{#10000},1,1,1,5"
+locations_default(#20097,#10000,1,1,1,5)
+hasLocation(#20096,#20097)
+#20098=*
+tokeninfo(#20098,6,#20001,1,"A")
+hasLocation(#20098,#20012)
+#20099=*
+tokeninfo(#20099,8,#20001,2,"{")
+#20100=@"loc,{#10000},1,9,1,9"
+locations_default(#20100,#10000,1,9,1,9)
+hasLocation(#20099,#20100)
+#20101=*
+tokeninfo(#20101,6,#20001,3,"x")
+hasLocation(#20101,#20017)
+#20102=*
+tokeninfo(#20102,8,#20001,4,"=")
+#20103=@"loc,{#10000},2,5,2,5"
+locations_default(#20103,#10000,2,5,2,5)
+hasLocation(#20102,#20103)
+#20104=*
+tokeninfo(#20104,7,#20001,5,"new")
+#20105=@"loc,{#10000},2,7,2,9"
+locations_default(#20105,#10000,2,7,2,9)
+hasLocation(#20104,#20105)
+#20106=*
+tokeninfo(#20106,8,#20001,6,".")
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+locations_default(#20107,#10000,2,10,2,10)
+hasLocation(#20106,#20107)
+#20108=*
+tokeninfo(#20108,6,#20001,7,"target")
+#20109=@"loc,{#10000},2,11,2,16"
+locations_default(#20109,#10000,2,11,2,16)
+hasLocation(#20108,#20109)
+#20110=*
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+#20111=@"loc,{#10000},2,17,2,17"
+locations_default(#20111,#10000,2,17,2,17)
+hasLocation(#20110,#20111)
+#20112=*
+tokeninfo(#20112,8,#20001,9,"}")
+hasLocation(#20112,#20079)
+#20113=*
+tokeninfo(#20113,7,#20001,10,"class")
+#20114=@"loc,{#10000},5,1,5,5"
+locations_default(#20114,#10000,5,1,5,5)
+hasLocation(#20113,#20114)
+#20115=*
+tokeninfo(#20115,6,#20001,11,"B")
+hasLocation(#20115,#20030)
+#20116=*
+tokeninfo(#20116,7,#20001,12,"extends")
+#20117=@"loc,{#10000},5,9,5,15"
+locations_default(#20117,#10000,5,9,5,15)
+hasLocation(#20116,#20117)
+#20118=*
+tokeninfo(#20118,6,#20001,13,"A")
+hasLocation(#20118,#20033)
+#20119=*
+tokeninfo(#20119,8,#20001,14,"{")
+#20120=@"loc,{#10000},5,19,5,19"
+locations_default(#20120,#10000,5,19,5,19)
+hasLocation(#20119,#20120)
+#20121=*
+tokeninfo(#20121,6,#20001,15,"y")
+hasLocation(#20121,#20037)
+#20122=*
+tokeninfo(#20122,8,#20001,16,"=")
+#20123=@"loc,{#10000},6,5,6,5"
+locations_default(#20123,#10000,6,5,6,5)
+hasLocation(#20122,#20123)
+#20124=*
+tokeninfo(#20124,7,#20001,17,"super")
+hasLocation(#20124,#20042)
+#20125=*
+tokeninfo(#20125,8,#20001,18,".")
+#20126=@"loc,{#10000},6,12,6,12"
+locations_default(#20126,#10000,6,12,6,12)
+hasLocation(#20125,#20126)
+#20127=*
+tokeninfo(#20127,6,#20001,19,"x")
+hasLocation(#20127,#20044)
+#20128=*
+tokeninfo(#20128,8,#20001,20,";")
+#20129=@"loc,{#10000},6,14,6,14"
+locations_default(#20129,#10000,6,14,6,14)
+hasLocation(#20128,#20129)
+#20130=*
+tokeninfo(#20130,8,#20001,21,"}")
+hasLocation(#20130,#20087)
+#20131=*
+tokeninfo(#20131,7,#20001,22,"class")
+#20132=@"loc,{#10000},9,1,9,5"
+locations_default(#20132,#10000,9,1,9,5)
+hasLocation(#20131,#20132)
+#20133=*
+tokeninfo(#20133,6,#20001,23,"C")
+hasLocation(#20133,#20061)
+#20134=*
+tokeninfo(#20134,8,#20001,24,"{")
+#20135=@"loc,{#10000},9,9,9,9"
+locations_default(#20135,#10000,9,9,9,9)
+hasLocation(#20134,#20135)
+#20136=*
+tokeninfo(#20136,6,#20001,25,"async")
+hasLocation(#20136,#20066)
+#20137=*
+tokeninfo(#20137,8,#20001,26,";")
+#20138=@"loc,{#10000},10,8,10,8"
+locations_default(#20138,#10000,10,8,10,8)
+hasLocation(#20137,#20138)
+#20139=*
+tokeninfo(#20139,8,#20001,27,"}")
+hasLocation(#20139,#20095)
+#20140=*
+tokeninfo(#20140,0,#20001,28,"")
+#20141=@"loc,{#10000},12,1,12,0"
+locations_default(#20141,#10000,12,1,12,0)
+hasLocation(#20140,#20141)
+#20142=*
+entry_cfg_node(#20142,#20001)
+#20143=@"loc,{#10000},1,1,1,0"
+locations_default(#20143,#10000,1,1,1,0)
+hasLocation(#20142,#20143)
+#20144=*
+exit_cfg_node(#20144,#20001)
+hasLocation(#20144,#20141)
+successor(#20065,#20063)
+successor(#20067,#20068)
+#20145=*
+entry_cfg_node(#20145,#20067)
+hasLocation(#20145,#20069)
+successor(#20063,#20073)
+#20146=*
+exit_cfg_node(#20146,#20067)
+hasLocation(#20146,#20069)
+successor(#20073,#20146)
+successor(#20145,#20065)
+successor(#20070,#20067)
+successor(#20068,#20058)
+successor(#20060,#20070)
+successor(#20058,#20144)
+successor(#20043,#20039)
+successor(#20041,#20043)
+successor(#20039,#20034)
+successor(#20036,#20041)
+successor(#20038,#20045)
+#20147=*
+entry_cfg_node(#20147,#20038)
+hasLocation(#20147,#20046)
+#20148=*
+exit_cfg_node(#20148,#20038)
+hasLocation(#20148,#20046)
+successor(#20052,#20053)
+successor(#20053,#20055)
+successor(#20057,#20056)
+successor(#20056,#20054)
+successor(#20055,#20057)
+successor(#20034,#20148)
+successor(#20054,#20036)
+successor(#20050,#20052)
+successor(#20147,#20050)
+successor(#20047,#20038)
+successor(#20045,#20027)
+successor(#20032,#20047)
+successor(#20029,#20032)
+successor(#20027,#20060)
+successor(#20019,#20014)
+successor(#20016,#20019)
+successor(#20018,#20021)
+#20149=*
+entry_cfg_node(#20149,#20018)
+hasLocation(#20149,#20022)
+successor(#20014,#20026)
+#20150=*
+exit_cfg_node(#20150,#20018)
+hasLocation(#20150,#20022)
+successor(#20026,#20150)
+successor(#20149,#20016)
+successor(#20023,#20018)
+successor(#20021,#20009)
+successor(#20011,#20023)
+successor(#20009,#20029)
+successor(#20142,#20011)
+numlines(#10000,11,9,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/excludes/input/.jshintignore b/javascript/extractor/tests/excludes/input/.jshintignore
new file mode 100644
index 00000000000..15a1c43efb2
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/.jshintignore
@@ -0,0 +1,2 @@
+f/bar*.js
+baz/
diff --git a/javascript/extractor/tests/excludes/input/a.js b/javascript/extractor/tests/excludes/input/a.js
new file mode 100644
index 00000000000..f70d7bba4ae
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/a.js
@@ -0,0 +1 @@
+42
\ No newline at end of file
diff --git a/javascript/extractor/tests/excludes/input/baz/a.js b/javascript/extractor/tests/excludes/input/baz/a.js
new file mode 100644
index 00000000000..7f78a0fa65a
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/baz/a.js
@@ -0,0 +1 @@
+console.log("Nor this.");
\ No newline at end of file
diff --git a/javascript/extractor/tests/excludes/input/f/bar.js b/javascript/extractor/tests/excludes/input/f/bar.js
new file mode 100644
index 00000000000..a11e2f701ad
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/f/bar.js
@@ -0,0 +1 @@
+console.log("And neither will this.");
\ No newline at end of file
diff --git a/javascript/extractor/tests/excludes/input/f/empty.json b/javascript/extractor/tests/excludes/input/f/empty.json
new file mode 100644
index 00000000000..9e26dfeeb6e
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/f/empty.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/javascript/extractor/tests/excludes/input/f/foo.js b/javascript/extractor/tests/excludes/input/f/foo.js
new file mode 100644
index 00000000000..23a8640c828
--- /dev/null
+++ b/javascript/extractor/tests/excludes/input/f/foo.js
@@ -0,0 +1 @@
+console.log("This file will not be extracted.");
\ No newline at end of file
diff --git a/javascript/extractor/tests/excludes/options.json b/javascript/extractor/tests/excludes/options.json
new file mode 100644
index 00000000000..93d35250cb0
--- /dev/null
+++ b/javascript/extractor/tests/excludes/options.json
@@ -0,0 +1,5 @@
+{
+    "exclude": ["**/foo.js"],
+    "exclude-path": [".jshintignore"],
+    "include": ["**/*.json"]
+}
diff --git a/javascript/extractor/tests/excludes/output/trap/a.js.trap b/javascript/extractor/tests/excludes/output/trap/a.js.trap
new file mode 100644
index 00000000000..3584a025695
--- /dev/null
+++ b/javascript/extractor/tests/excludes/output/trap/a.js.trap
@@ -0,0 +1,50 @@
+#10000=@"/a.js;sourcefile"
+files(#10000,"/a.js","a","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,2"
+locations_default(#20002,#10000,1,1,1,2)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"42")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,3,#20003,0,"42")
+hasLocation(#20004,#20002)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+literals("42","42",#20004)
+#20005=*
+lines(#20005,#20001,"42","")
+hasLocation(#20005,#20002)
+numlines(#20001,1,1,0)
+#20006=*
+tokeninfo(#20006,3,#20001,0,"42")
+hasLocation(#20006,#20002)
+#20007=*
+tokeninfo(#20007,0,#20001,1,"")
+#20008=@"loc,{#10000},1,3,1,2"
+locations_default(#20008,#10000,1,3,1,2)
+hasLocation(#20007,#20008)
+#20009=*
+entry_cfg_node(#20009,#20001)
+#20010=@"loc,{#10000},1,1,1,0"
+locations_default(#20010,#10000,1,1,1,0)
+hasLocation(#20009,#20010)
+#20011=*
+exit_cfg_node(#20011,#20001)
+hasLocation(#20011,#20008)
+successor(#20003,#20004)
+successor(#20004,#20011)
+successor(#20009,#20003)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/excludes/output/trap/empty.json.trap b/javascript/extractor/tests/excludes/output/trap/empty.json.trap
new file mode 100644
index 00000000000..597f0575b19
--- /dev/null
+++ b/javascript/extractor/tests/excludes/output/trap/empty.json.trap
@@ -0,0 +1,18 @@
+#10000=@"/f/empty.json;sourcefile"
+files(#10000,"/f/empty.json","empty","json",0)
+#10001=@"/f;folder"
+folders(#10001,"/f","f")
+#10002=@"/;folder"
+folders(#10002,"/","")
+containerparent(#10002,#10001)
+containerparent(#10001,#10000)
+#10003=@"loc,{#10000},0,0,0,0"
+locations_default(#10003,#10000,0,0,0,0)
+hasLocation(#10000,#10003)
+#20000=*
+json(#20000,5,#10000,0,"{}")
+#20001=@"loc,{#10000},1,1,1,2"
+locations_default(#20001,#10000,1,1,1,2)
+hasLocation(#20000,#20001)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/exprs/input/assignment.js b/javascript/extractor/tests/exprs/input/assignment.js
new file mode 100644
index 00000000000..07426bf3f9e
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/assignment.js
@@ -0,0 +1,12 @@
+a = 23;
+a += 19;
+a -= 9;
+a *= b;
+a /= 2;
+a %= 2;
+a <<= 8;
+a >>= 7;
+a >>>= 2;
+a |= 2;
+a ^= 1;
+a &= 3;
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/binary.js b/javascript/extractor/tests/exprs/input/binary.js
new file mode 100644
index 00000000000..30fd4fa7d86
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/binary.js
@@ -0,0 +1,15 @@
+1 << 2;
+2 >> 1;
+2 >>> 1;
+23 + 19;
+42 - 19;
+2 * 3;
+8 / 5;
+2 % 1;
+2 | 3;
+2 ^ 3;
+2 & 3;
+'prototype' in Object;
+[] instanceof Array;
+1 && 2;
+1 || 2;
diff --git a/javascript/extractor/tests/exprs/input/comparison.js b/javascript/extractor/tests/exprs/input/comparison.js
new file mode 100644
index 00000000000..0959e2b4a9d
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/comparison.js
@@ -0,0 +1,8 @@
+1 == 1;
+1 != 2;
+1 === 1;
+1 !== 2;
+1 < 2;
+1 <= 2;
+2 > 1;
+2 >= 1;
diff --git a/javascript/extractor/tests/exprs/input/fnnesting.js b/javascript/extractor/tests/exprs/input/fnnesting.js
new file mode 100644
index 00000000000..5566d361690
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/fnnesting.js
@@ -0,0 +1 @@
+f(function(){}, 23);
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/others.js b/javascript/extractor/tests/exprs/input/others.js
new file mode 100644
index 00000000000..8ba5b02925b
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/others.js
@@ -0,0 +1,3 @@
+23, 42;
+23, 42, 56;
+true ? 0 : 1;
diff --git a/javascript/extractor/tests/exprs/input/parens.js b/javascript/extractor/tests/exprs/input/parens.js
new file mode 100644
index 00000000000..096528fdec4
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/parens.js
@@ -0,0 +1 @@
+--(NaN);
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/primaries.js b/javascript/extractor/tests/exprs/input/primaries.js
new file mode 100644
index 00000000000..b13cda6eb42
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/primaries.js
@@ -0,0 +1,30 @@
+null;
+true;
+false;
+23;
+2.3;
+.42;
+7.6e23;
+1E-42;
+0xdeadbeef;
+"Hello";
+'world';
+"'what?'\x0a";
+'"why?"\n';
+/^(need?le)+/gi;
+(23);
+[23, 42, , "hi" ];
+({ x: 23,
+   y: this,
+   get o() {},
+   get p() {},
+   set p(v) {}});
+new Array;
+new Object();
+new String("hi");
+String("");
+Object.create({});
+String['epytotorp'.reverse()];
+[,,];
+[1,];
+({ z: 56, });
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/regexp.js b/javascript/extractor/tests/exprs/input/regexp.js
new file mode 100644
index 00000000000..b6741b6a06d
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/regexp.js
@@ -0,0 +1,44 @@
+/t/;
+/foo|bar/;
+/(?:)/;
+/^abc$/;
+/\bx\b/;
+/\bx\B/;
+/x(?=y)/;
+/x(?!z)/;
+/a*/;
+/a*?/;
+/a+/;
+/a+?/;
+/a?/;
+/a??/;
+/a{1}/;
+/a{1,}/;
+/a{1,2}/;
+/a{1}?/;
+/a{1,}?/;
+/a{1,2}?/;
+/./;
+/(abc)/;
+/(?:abc)/;
+/\x0a/;
+/\u000a/;
+/\10/;
+/\t\n\r\f\v/;
+/\ca\cN/;
+/\w\S/;
+/\\/;
+/[abc]/;
+/[a-z]/;
+/[a-zA-Z]/;
+/[-a-z]/;
+/[^a-z]/;
+/[a\b\x0c]/;
+/a{/;
+/a{b}/;
+/a{2/;
+/\xa/;
+/\c0/;
+/[]/;
+/[^]/;
+/<tpl\b[^>]*>((?:(?=([^<]+))\2|<(?!tpl\b[^>]*>))*?)<\/tpl>/;
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/unary.js b/javascript/extractor/tests/exprs/input/unary.js
new file mode 100644
index 00000000000..9ba6bfd9524
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/unary.js
@@ -0,0 +1,7 @@
+-23;
++42;
+!true;
+~2;
+typeof Object;
+void(0);
+delete Object.prototype;
\ No newline at end of file
diff --git a/javascript/extractor/tests/exprs/input/update.js b/javascript/extractor/tests/exprs/input/update.js
new file mode 100644
index 00000000000..0500255ad84
--- /dev/null
+++ b/javascript/extractor/tests/exprs/input/update.js
@@ -0,0 +1,4 @@
+++a;
+a++;
+--b;
+b--;
diff --git a/javascript/extractor/tests/exprs/output/trap/assignment.js.trap b/javascript/extractor/tests/exprs/output/trap/assignment.js.trap
new file mode 100644
index 00000000000..d191864dadc
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/assignment.js.trap
@@ -0,0 +1,684 @@
+#10000=@"/assignment.js;sourcefile"
+files(#10000,"/assignment.js","assignment","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,12,7"
+locations_default(#20002,#10000,1,1,12,7)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"a = 23;")
+#20004=@"loc,{#10000},1,1,1,7"
+locations_default(#20004,#10000,1,1,1,7)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,47,#20003,0,"a = 23")
+#20006=@"loc,{#10000},1,1,1,6"
+locations_default(#20006,#10000,1,1,1,6)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,79,#20005,0,"a")
+#20008=@"loc,{#10000},1,1,1,1"
+locations_default(#20008,#10000,1,1,1,1)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("a","a",#20007)
+#20009=@"var;{a};{#20000}"
+variables(#20009,"a",#20000)
+bind(#20007,#20009)
+#20010=*
+exprs(#20010,3,#20005,1,"23")
+#20011=@"loc,{#10000},1,5,1,6"
+locations_default(#20011,#10000,1,5,1,6)
+hasLocation(#20010,#20011)
+enclosingStmt(#20010,#20003)
+exprContainers(#20010,#20001)
+literals("23","23",#20010)
+#20012=*
+stmts(#20012,2,#20001,1,"a += 19;")
+#20013=@"loc,{#10000},2,1,2,8"
+locations_default(#20013,#10000,2,1,2,8)
+hasLocation(#20012,#20013)
+stmtContainers(#20012,#20001)
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diff --git a/javascript/extractor/tests/exprs/output/trap/binary.js.trap b/javascript/extractor/tests/exprs/output/trap/binary.js.trap
new file mode 100644
index 00000000000..1136313bf1d
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/binary.js.trap
@@ -0,0 +1,840 @@
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new file mode 100644
index 00000000000..efa30966aa3
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diff --git a/javascript/extractor/tests/exprs/output/trap/fnnesting.js.trap b/javascript/extractor/tests/exprs/output/trap/fnnesting.js.trap
new file mode 100644
index 00000000000..e38676531c2
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/fnnesting.js.trap
@@ -0,0 +1,154 @@
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diff --git a/javascript/extractor/tests/exprs/output/trap/others.js.trap b/javascript/extractor/tests/exprs/output/trap/others.js.trap
new file mode 100644
index 00000000000..632e7594828
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/others.js.trap
@@ -0,0 +1,225 @@
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new file mode 100644
index 00000000000..6257a3fa929
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/parens.js.trap
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new file mode 100644
index 00000000000..564dc2dd641
--- /dev/null
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+hasLocation(#20459,#20460)
+#20461=*
+tokeninfo(#20461,3,#20001,117,"1")
+hasLocation(#20461,#20216)
+#20462=*
+tokeninfo(#20462,8,#20001,118,",")
+#20463=@"loc,{#10000},29,3,29,3"
+locations_default(#20463,#10000,29,3,29,3)
+hasLocation(#20462,#20463)
+#20464=*
+tokeninfo(#20464,8,#20001,119,"]")
+#20465=@"loc,{#10000},29,4,29,4"
+locations_default(#20465,#10000,29,4,29,4)
+hasLocation(#20464,#20465)
+#20466=*
+tokeninfo(#20466,8,#20001,120,";")
+#20467=@"loc,{#10000},29,5,29,5"
+locations_default(#20467,#10000,29,5,29,5)
+hasLocation(#20466,#20467)
+#20468=*
+tokeninfo(#20468,8,#20001,121,"(")
+#20469=@"loc,{#10000},30,1,30,1"
+locations_default(#20469,#10000,30,1,30,1)
+hasLocation(#20468,#20469)
+#20470=*
+tokeninfo(#20470,8,#20001,122,"{")
+#20471=@"loc,{#10000},30,2,30,2"
+locations_default(#20471,#10000,30,2,30,2)
+hasLocation(#20470,#20471)
+#20472=*
+tokeninfo(#20472,6,#20001,123,"z")
+hasLocation(#20472,#20226)
+#20473=*
+tokeninfo(#20473,8,#20001,124,":")
+#20474=@"loc,{#10000},30,5,30,5"
+locations_default(#20474,#10000,30,5,30,5)
+hasLocation(#20473,#20474)
+#20475=*
+tokeninfo(#20475,3,#20001,125,"56")
+hasLocation(#20475,#20228)
+#20476=*
+tokeninfo(#20476,8,#20001,126,",")
+#20477=@"loc,{#10000},30,9,30,9"
+locations_default(#20477,#10000,30,9,30,9)
+hasLocation(#20476,#20477)
+#20478=*
+tokeninfo(#20478,8,#20001,127,"}")
+#20479=@"loc,{#10000},30,11,30,11"
+locations_default(#20479,#10000,30,11,30,11)
+hasLocation(#20478,#20479)
+#20480=*
+tokeninfo(#20480,8,#20001,128,")")
+#20481=@"loc,{#10000},30,12,30,12"
+locations_default(#20481,#10000,30,12,30,12)
+hasLocation(#20480,#20481)
+#20482=*
+tokeninfo(#20482,8,#20001,129,";")
+#20483=@"loc,{#10000},30,13,30,13"
+locations_default(#20483,#10000,30,13,30,13)
+hasLocation(#20482,#20483)
+#20484=*
+tokeninfo(#20484,0,#20001,130,"")
+#20485=@"loc,{#10000},30,14,30,13"
+locations_default(#20485,#10000,30,14,30,13)
+hasLocation(#20484,#20485)
+#20486=*
+entry_cfg_node(#20486,#20001)
+#20487=@"loc,{#10000},1,1,1,0"
+locations_default(#20487,#10000,1,1,1,0)
+hasLocation(#20486,#20487)
+#20488=*
+exit_cfg_node(#20488,#20001)
+hasLocation(#20488,#20485)
+successor(#20217,#20219)
+successor(#20219,#20221)
+successor(#20221,#20225)
+successor(#20227,#20223)
+successor(#20225,#20227)
+successor(#20223,#20488)
+successor(#20211,#20213)
+successor(#20213,#20215)
+successor(#20215,#20217)
+successor(#20207,#20209)
+successor(#20209,#20211)
+successor(#20193,#20197)
+successor(#20205,#20201)
+successor(#20203,#20205)
+successor(#20201,#20199)
+successor(#20199,#20195)
+successor(#20197,#20203)
+successor(#20195,#20207)
+successor(#20181,#20187)
+successor(#20191,#20183)
+successor(#20189,#20185)
+successor(#20187,#20189)
+successor(#20185,#20191)
+successor(#20183,#20193)
+successor(#20173,#20177)
+successor(#20179,#20175)
+successor(#20177,#20179)
+successor(#20175,#20181)
+successor(#20164,#20168)
+successor(#20171,#20166)
+successor(#20168,#20171)
+successor(#20166,#20173)
+successor(#20157,#20161)
+successor(#20161,#20159)
+successor(#20159,#20164)
+successor(#20150,#20154)
+successor(#20154,#20152)
+successor(#20152,#20157)
+successor(#20099,#20101)
+successor(#20101,#20103)
+successor(#20103,#20107)
+successor(#20141,#20137)
+#20489=*
+entry_cfg_node(#20489,#20141)
+#20490=@"loc,{#10000},21,9,21,8"
+locations_default(#20490,#10000,21,9,21,8)
+hasLocation(#20489,#20490)
+#20491=*
+exit_cfg_node(#20491,#20141)
+#20492=@"loc,{#10000},21,15,21,14"
+locations_default(#20492,#10000,21,15,21,14)
+hasLocation(#20491,#20492)
+successor(#20148,#20491)
+successor(#20145,#20148)
+successor(#20489,#20145)
+successor(#20139,#20141)
+successor(#20137,#20150)
+successor(#20131,#20127)
+#20493=*
+entry_cfg_node(#20493,#20131)
+#20494=@"loc,{#10000},20,9,20,8"
+locations_default(#20494,#10000,20,9,20,8)
+hasLocation(#20493,#20494)
+#20495=*
+exit_cfg_node(#20495,#20131)
+#20496=@"loc,{#10000},20,14,20,13"
+locations_default(#20496,#10000,20,14,20,13)
+hasLocation(#20495,#20496)
+successor(#20135,#20495)
+successor(#20493,#20135)
+successor(#20129,#20131)
+successor(#20127,#20139)
+successor(#20121,#20117)
+#20497=*
+entry_cfg_node(#20497,#20121)
+#20498=@"loc,{#10000},19,9,19,8"
+locations_default(#20498,#10000,19,9,19,8)
+hasLocation(#20497,#20498)
+#20499=*
+exit_cfg_node(#20499,#20121)
+#20500=@"loc,{#10000},19,14,19,13"
+locations_default(#20500,#10000,19,14,19,13)
+hasLocation(#20499,#20500)
+successor(#20125,#20499)
+successor(#20497,#20125)
+successor(#20119,#20121)
+successor(#20117,#20129)
+successor(#20115,#20111)
+successor(#20113,#20115)
+successor(#20111,#20119)
+successor(#20109,#20105)
+successor(#20107,#20109)
+successor(#20105,#20113)
+successor(#20089,#20091)
+successor(#20091,#20093)
+successor(#20097,#20099)
+successor(#20095,#20097)
+successor(#20093,#20095)
+successor(#20083,#20085)
+successor(#20085,#20087)
+successor(#20087,#20089)
+successor(#20055,#20057)
+successor(#20057,#20083)
+successor(#20051,#20053)
+successor(#20053,#20055)
+successor(#20047,#20049)
+successor(#20049,#20051)
+successor(#20043,#20045)
+successor(#20045,#20047)
+successor(#20039,#20041)
+successor(#20041,#20043)
+successor(#20035,#20037)
+successor(#20037,#20039)
+successor(#20031,#20033)
+successor(#20033,#20035)
+successor(#20027,#20029)
+successor(#20029,#20031)
+successor(#20023,#20025)
+successor(#20025,#20027)
+successor(#20019,#20021)
+successor(#20021,#20023)
+successor(#20015,#20017)
+successor(#20017,#20019)
+successor(#20011,#20013)
+successor(#20013,#20015)
+successor(#20007,#20009)
+successor(#20009,#20011)
+successor(#20003,#20005)
+successor(#20005,#20007)
+successor(#20486,#20003)
+numlines(#10000,30,30,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/exprs/output/trap/regexp.js.trap b/javascript/extractor/tests/exprs/output/trap/regexp.js.trap
new file mode 100644
index 00000000000..9a3eb7e3595
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/regexp.js.trap
@@ -0,0 +1,2250 @@
+#10000=@"/regexp.js;sourcefile"
+files(#10000,"/regexp.js","regexp","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,44,60"
+locations_default(#20002,#10000,1,1,44,60)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"/t/;")
+#20004=@"loc,{#10000},1,1,1,4"
+locations_default(#20004,#10000,1,1,1,4)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,5,#20003,0,"/t/")
+#20006=@"loc,{#10000},1,1,1,3"
+locations_default(#20006,#10000,1,1,1,3)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+literals("/t/","/t/",#20005)
+#20007=*
+regexpterm(#20007,14,#20005,0,"t")
+#20008=@"loc,{#10000},1,2,1,2"
+locations_default(#20008,#10000,1,2,1,2)
+hasLocation(#20007,#20008)
+regexpConstValue(#20007,"t")
+#20009=*
+stmts(#20009,2,#20001,1,"/foo|bar/;")
+#20010=@"loc,{#10000},2,1,2,10"
+locations_default(#20010,#10000,2,1,2,10)
+hasLocation(#20009,#20010)
+stmtContainers(#20009,#20001)
+#20011=*
+exprs(#20011,5,#20009,0,"/foo|bar/")
+#20012=@"loc,{#10000},2,1,2,9"
+locations_default(#20012,#10000,2,1,2,9)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20009)
+exprContainers(#20011,#20001)
+literals("/foo|bar/","/foo|bar/",#20011)
+#20013=*
+regexpterm(#20013,0,#20011,0,"foo|bar")
+#20014=@"loc,{#10000},2,2,2,8"
+locations_default(#20014,#10000,2,2,2,8)
+hasLocation(#20013,#20014)
+#20015=*
+regexpterm(#20015,1,#20013,0,"foo")
+#20016=@"loc,{#10000},2,2,2,4"
+locations_default(#20016,#10000,2,2,2,4)
+hasLocation(#20015,#20016)
+#20017=*
+regexpterm(#20017,14,#20015,0,"f")
+#20018=@"loc,{#10000},2,2,2,2"
+locations_default(#20018,#10000,2,2,2,2)
+hasLocation(#20017,#20018)
+regexpConstValue(#20017,"f")
+#20019=*
+regexpterm(#20019,14,#20015,1,"o")
+#20020=@"loc,{#10000},2,3,2,3"
+locations_default(#20020,#10000,2,3,2,3)
+hasLocation(#20019,#20020)
+regexpConstValue(#20019,"o")
+#20021=*
+regexpterm(#20021,14,#20015,2,"o")
+#20022=@"loc,{#10000},2,4,2,4"
+locations_default(#20022,#10000,2,4,2,4)
+hasLocation(#20021,#20022)
+regexpConstValue(#20021,"o")
+#20023=*
+regexpterm(#20023,1,#20013,1,"bar")
+#20024=@"loc,{#10000},2,6,2,8"
+locations_default(#20024,#10000,2,6,2,8)
+hasLocation(#20023,#20024)
+#20025=*
+regexpterm(#20025,14,#20023,0,"b")
+#20026=@"loc,{#10000},2,6,2,6"
+locations_default(#20026,#10000,2,6,2,6)
+hasLocation(#20025,#20026)
+regexpConstValue(#20025,"b")
+#20027=*
+regexpterm(#20027,14,#20023,1,"a")
+#20028=@"loc,{#10000},2,7,2,7"
+locations_default(#20028,#10000,2,7,2,7)
+hasLocation(#20027,#20028)
+regexpConstValue(#20027,"a")
+#20029=*
+regexpterm(#20029,14,#20023,2,"r")
+#20030=@"loc,{#10000},2,8,2,8"
+locations_default(#20030,#10000,2,8,2,8)
+hasLocation(#20029,#20030)
+regexpConstValue(#20029,"r")
+#20031=*
+stmts(#20031,2,#20001,2,"/(?:)/;")
+#20032=@"loc,{#10000},3,1,3,7"
+locations_default(#20032,#10000,3,1,3,7)
+hasLocation(#20031,#20032)
+stmtContainers(#20031,#20001)
+#20033=*
+exprs(#20033,5,#20031,0,"/(?:)/")
+#20034=@"loc,{#10000},3,1,3,6"
+locations_default(#20034,#10000,3,1,3,6)
+hasLocation(#20033,#20034)
+enclosingStmt(#20033,#20031)
+exprContainers(#20033,#20001)
+literals("/(?:)/","/(?:)/",#20033)
+#20035=*
+regexpterm(#20035,13,#20033,0,"(?:)")
+#20036=@"loc,{#10000},3,2,3,5"
+locations_default(#20036,#10000,3,2,3,5)
+hasLocation(#20035,#20036)
+#20037=*
+regexpterm(#20037,1,#20035,0,"")
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+locations_default(#20038,#10000,3,5,3,4)
+hasLocation(#20037,#20038)
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+stmts(#20039,2,#20001,3,"/^abc$/;")
+#20040=@"loc,{#10000},4,1,4,8"
+locations_default(#20040,#10000,4,1,4,8)
+hasLocation(#20039,#20040)
+stmtContainers(#20039,#20001)
+#20041=*
+exprs(#20041,5,#20039,0,"/^abc$/")
+#20042=@"loc,{#10000},4,1,4,7"
+locations_default(#20042,#10000,4,1,4,7)
+hasLocation(#20041,#20042)
+enclosingStmt(#20041,#20039)
+exprContainers(#20041,#20001)
+literals("/^abc$/","/^abc$/",#20041)
+#20043=*
+regexpterm(#20043,1,#20041,0,"^abc$")
+#20044=@"loc,{#10000},4,2,4,6"
+locations_default(#20044,#10000,4,2,4,6)
+hasLocation(#20043,#20044)
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+locations_default(#20046,#10000,4,2,4,2)
+hasLocation(#20045,#20046)
+#20047=*
+regexpterm(#20047,14,#20043,1,"a")
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+regexpterm(#20049,14,#20043,2,"b")
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+locations_default(#20050,#10000,4,4,4,4)
+hasLocation(#20049,#20050)
+regexpConstValue(#20049,"b")
+#20051=*
+regexpterm(#20051,14,#20043,3,"c")
+#20052=@"loc,{#10000},4,5,4,5"
+locations_default(#20052,#10000,4,5,4,5)
+hasLocation(#20051,#20052)
+regexpConstValue(#20051,"c")
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+regexpterm(#20053,3,#20043,4,"$")
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+locations_default(#20054,#10000,4,6,4,6)
+hasLocation(#20053,#20054)
+#20055=*
+stmts(#20055,2,#20001,4,"/\bx\b/;")
+#20056=@"loc,{#10000},5,1,5,8"
+locations_default(#20056,#10000,5,1,5,8)
+hasLocation(#20055,#20056)
+stmtContainers(#20055,#20001)
+#20057=*
+exprs(#20057,5,#20055,0,"/\bx\b/")
+#20058=@"loc,{#10000},5,1,5,7"
+locations_default(#20058,#10000,5,1,5,7)
+hasLocation(#20057,#20058)
+enclosingStmt(#20057,#20055)
+exprContainers(#20057,#20001)
+literals("/\bx\b/","/\bx\b/",#20057)
+#20059=*
+regexpterm(#20059,1,#20057,0,"\bx\b")
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+locations_default(#20060,#10000,5,2,5,6)
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+locations_default(#20062,#10000,5,2,5,3)
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+locations_default(#20064,#10000,5,4,5,4)
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+regexpConstValue(#20063,"x")
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+locations_default(#20066,#10000,5,5,5,6)
+hasLocation(#20065,#20066)
+#20067=*
+stmts(#20067,2,#20001,5,"/\bx\B/;")
+#20068=@"loc,{#10000},6,1,6,8"
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+hasLocation(#20067,#20068)
+stmtContainers(#20067,#20001)
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+exprs(#20069,5,#20067,0,"/\bx\B/")
+#20070=@"loc,{#10000},6,1,6,7"
+locations_default(#20070,#10000,6,1,6,7)
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+enclosingStmt(#20069,#20067)
+exprContainers(#20069,#20001)
+literals("/\bx\B/","/\bx\B/",#20069)
+#20071=*
+regexpterm(#20071,1,#20069,0,"\bx\B")
+#20072=@"loc,{#10000},6,2,6,6"
+locations_default(#20072,#10000,6,2,6,6)
+hasLocation(#20071,#20072)
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+regexpterm(#20073,4,#20071,0,"\b")
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+locations_default(#20074,#10000,6,2,6,3)
+hasLocation(#20073,#20074)
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+regexpterm(#20075,14,#20071,1,"x")
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+locations_default(#20076,#10000,6,4,6,4)
+hasLocation(#20075,#20076)
+regexpConstValue(#20075,"x")
+#20077=*
+regexpterm(#20077,5,#20071,2,"\B")
+#20078=@"loc,{#10000},6,5,6,6"
+locations_default(#20078,#10000,6,5,6,6)
+hasLocation(#20077,#20078)
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+stmts(#20079,2,#20001,6,"/x(?=y)/;")
+#20080=@"loc,{#10000},7,1,7,9"
+locations_default(#20080,#10000,7,1,7,9)
+hasLocation(#20079,#20080)
+stmtContainers(#20079,#20001)
+#20081=*
+exprs(#20081,5,#20079,0,"/x(?=y)/")
+#20082=@"loc,{#10000},7,1,7,8"
+locations_default(#20082,#10000,7,1,7,8)
+hasLocation(#20081,#20082)
+enclosingStmt(#20081,#20079)
+exprContainers(#20081,#20001)
+literals("/x(?=y)/","/x(?=y)/",#20081)
+#20083=*
+regexpterm(#20083,1,#20081,0,"x(?=y)")
+#20084=@"loc,{#10000},7,2,7,7"
+locations_default(#20084,#10000,7,2,7,7)
+hasLocation(#20083,#20084)
+#20085=*
+regexpterm(#20085,14,#20083,0,"x")
+#20086=@"loc,{#10000},7,2,7,2"
+locations_default(#20086,#10000,7,2,7,2)
+hasLocation(#20085,#20086)
+regexpConstValue(#20085,"x")
+#20087=*
+regexpterm(#20087,6,#20083,1,"(?=y)")
+#20088=@"loc,{#10000},7,3,7,7"
+locations_default(#20088,#10000,7,3,7,7)
+hasLocation(#20087,#20088)
+#20089=*
+regexpterm(#20089,14,#20087,0,"y")
+#20090=@"loc,{#10000},7,6,7,6"
+locations_default(#20090,#10000,7,6,7,6)
+hasLocation(#20089,#20090)
+regexpConstValue(#20089,"y")
+#20091=*
+stmts(#20091,2,#20001,7,"/x(?!z)/;")
+#20092=@"loc,{#10000},8,1,8,9"
+locations_default(#20092,#10000,8,1,8,9)
+hasLocation(#20091,#20092)
+stmtContainers(#20091,#20001)
+#20093=*
+exprs(#20093,5,#20091,0,"/x(?!z)/")
+#20094=@"loc,{#10000},8,1,8,8"
+locations_default(#20094,#10000,8,1,8,8)
+hasLocation(#20093,#20094)
+enclosingStmt(#20093,#20091)
+exprContainers(#20093,#20001)
+literals("/x(?!z)/","/x(?!z)/",#20093)
+#20095=*
+regexpterm(#20095,1,#20093,0,"x(?!z)")
+#20096=@"loc,{#10000},8,2,8,7"
+locations_default(#20096,#10000,8,2,8,7)
+hasLocation(#20095,#20096)
+#20097=*
+regexpterm(#20097,14,#20095,0,"x")
+#20098=@"loc,{#10000},8,2,8,2"
+locations_default(#20098,#10000,8,2,8,2)
+hasLocation(#20097,#20098)
+regexpConstValue(#20097,"x")
+#20099=*
+regexpterm(#20099,7,#20095,1,"(?!z)")
+#20100=@"loc,{#10000},8,3,8,7"
+locations_default(#20100,#10000,8,3,8,7)
+hasLocation(#20099,#20100)
+#20101=*
+regexpterm(#20101,14,#20099,0,"z")
+#20102=@"loc,{#10000},8,6,8,6"
+locations_default(#20102,#10000,8,6,8,6)
+hasLocation(#20101,#20102)
+regexpConstValue(#20101,"z")
+#20103=*
+stmts(#20103,2,#20001,8,"/a*/;")
+#20104=@"loc,{#10000},9,1,9,5"
+locations_default(#20104,#10000,9,1,9,5)
+hasLocation(#20103,#20104)
+stmtContainers(#20103,#20001)
+#20105=*
+exprs(#20105,5,#20103,0,"/a*/")
+#20106=@"loc,{#10000},9,1,9,4"
+locations_default(#20106,#10000,9,1,9,4)
+hasLocation(#20105,#20106)
+enclosingStmt(#20105,#20103)
+exprContainers(#20105,#20001)
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")
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+")
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+hasLocation(#20427,#20428)
+#20429=*
+stmts(#20429,2,#20001,41,"/[]/;")
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diff --git a/javascript/extractor/tests/exprs/output/trap/unary.js.trap b/javascript/extractor/tests/exprs/output/trap/unary.js.trap
new file mode 100644
index 00000000000..9ab29f7463c
--- /dev/null
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+successor(#20103,#20003)
+numlines(#10000,7,7,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/exprs/output/trap/update.js.trap b/javascript/extractor/tests/exprs/output/trap/update.js.trap
new file mode 100644
index 00000000000..ea3b22006e9
--- /dev/null
+++ b/javascript/extractor/tests/exprs/output/trap/update.js.trap
@@ -0,0 +1,204 @@
+#10000=@"/update.js;sourcefile"
+files(#10000,"/update.js","update","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
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+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
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+hasLocation(#20005,#20006)
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+locations_default(#20008,#10000,1,3,1,3)
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+variables(#20009,"a",#20000)
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+")
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diff --git a/javascript/extractor/tests/extensions/input/tst.es6 b/javascript/extractor/tests/extensions/input/tst.es6
new file mode 100644
index 00000000000..d21851cafa5
--- /dev/null
+++ b/javascript/extractor/tests/extensions/input/tst.es6
@@ -0,0 +1 @@
+console.log("Hello ES6");
diff --git a/javascript/extractor/tests/extensions/input/tst2.es b/javascript/extractor/tests/extensions/input/tst2.es
new file mode 100644
index 00000000000..f3365cbe708
--- /dev/null
+++ b/javascript/extractor/tests/extensions/input/tst2.es
@@ -0,0 +1 @@
+console.log("Hello ES");
diff --git a/javascript/extractor/tests/extensions/output/trap/tst.es6.trap b/javascript/extractor/tests/extensions/output/trap/tst.es6.trap
new file mode 100644
index 00000000000..a9654e04dff
--- /dev/null
+++ b/javascript/extractor/tests/extensions/output/trap/tst.es6.trap
@@ -0,0 +1,123 @@
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+")
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+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/extensions/output/trap/tst2.es.trap b/javascript/extractor/tests/extensions/output/trap/tst2.es.trap
new file mode 100644
index 00000000000..af533ef6a61
--- /dev/null
+++ b/javascript/extractor/tests/extensions/output/trap/tst2.es.trap
@@ -0,0 +1,123 @@
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+successor(#20004,#20010)
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diff --git a/javascript/extractor/tests/externs/input/Point.js b/javascript/extractor/tests/externs/input/Point.js
new file mode 100644
index 00000000000..0975d986e90
--- /dev/null
+++ b/javascript/extractor/tests/externs/input/Point.js
@@ -0,0 +1,17 @@
+function Point(x, y) {}
+
+Point.prototype.move = function(dx, dy) {};
+Point.prototype.obj = {};
+Point.prototype.secret;
+
+Point.ORIGIN;
+Point.foo = function() {};
+
+var someGlobal;
+
+/** @typedef {String} */
+var MyString;
+
+Point.prototype['final'];
+
+'use strict';
\ No newline at end of file
diff --git a/javascript/extractor/tests/externs/options.json b/javascript/extractor/tests/externs/options.json
new file mode 100644
index 00000000000..fe719bb8f33
--- /dev/null
+++ b/javascript/extractor/tests/externs/options.json
@@ -0,0 +1,3 @@
+{
+    "externs": true
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/externs/output/trap/Point.js.trap b/javascript/extractor/tests/externs/output/trap/Point.js.trap
new file mode 100644
index 00000000000..1b79ccca210
--- /dev/null
+++ b/javascript/extractor/tests/externs/output/trap/Point.js.trap
@@ -0,0 +1,944 @@
+#10000=@"/Point.js;sourcefile"
+files(#10000,"/Point.js","Point","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
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+hasLocation(#20001,#20002)
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+variables(#20003,"Point",#20000)
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+#20005=@"var;{MyString};{#20000}"
+variables(#20005,"MyString",#20000)
+#20006=*
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+locations_default(#20007,#10000,1,1,1,23)
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+stmtContainers(#20006,#20001)
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+locations_default(#20009,#10000,1,10,1,14)
+hasLocation(#20008,#20009)
+exprContainers(#20008,#20006)
+literals("Point","Point",#20008)
+decl(#20008,#20003)
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+scopenodes(#20006,#20010)
+scopenesting(#20010,#20000)
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+variables(#20011,"x",#20010)
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+locations_default(#20013,#10000,1,16,1,16)
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+exprContainers(#20012,#20006)
+literals("x","x",#20012)
+decl(#20012,#20011)
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+decl(#20015,#20014)
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new file mode 100644
index 00000000000..dafa42eb242
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/anonFunctionOptionalParm.js
@@ -0,0 +1 @@
+var f = (x?:int) => {};
diff --git a/javascript/extractor/tests/flow/input/anonFunctionReturnType.js b/javascript/extractor/tests/flow/input/anonFunctionReturnType.js
new file mode 100644
index 00000000000..12343b51f53
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/anonFunctionReturnType.js
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/anonFunctionWithoutParens.js b/javascript/extractor/tests/flow/input/anonFunctionWithoutParens.js
new file mode 100644
index 00000000000..f403b49788d
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/anonFunctionWithoutParens.js
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/anonIndexer.js b/javascript/extractor/tests/flow/input/anonIndexer.js
new file mode 100644
index 00000000000..cddd3c3af04
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/anonIndexer.js
@@ -0,0 +1 @@
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diff --git a/javascript/extractor/tests/flow/input/async.js b/javascript/extractor/tests/flow/input/async.js
new file mode 100644
index 00000000000..5c4557761e3
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/async.js
@@ -0,0 +1 @@
+let f = async() : Promise<string> => await foo();
diff --git a/javascript/extractor/tests/flow/input/atAtIteratorProp.js b/javascript/extractor/tests/flow/input/atAtIteratorProp.js
new file mode 100644
index 00000000000..bb86346e287
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/atAtIteratorProp.js
@@ -0,0 +1,3 @@
+declare class Foo {
+  @@iterator(): int
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/complexParamTypes.js b/javascript/extractor/tests/flow/input/complexParamTypes.js
new file mode 100644
index 00000000000..2428edef9a6
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/complexParamTypes.js
@@ -0,0 +1 @@
+type Asyncify = <A, B, C>((A, B) => C) => (A, B, Callback<C>) => void
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/complexParamTypes2.js b/javascript/extractor/tests/flow/input/complexParamTypes2.js
new file mode 100644
index 00000000000..4507e7e6cea
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/complexParamTypes2.js
@@ -0,0 +1,3 @@
+type o = {
+  push(T | Array<T>, void | C): void
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/declareExport.js b/javascript/extractor/tests/flow/input/declareExport.js
new file mode 100644
index 00000000000..47c183c6c5e
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/declareExport.js
@@ -0,0 +1,4 @@
+declare export var foo : boolean;
+declare export default typeof simpleTextBuffer$TextBuffer;
+declare export default marked$Marked;
+declare export type ProcessEnv = { };
diff --git a/javascript/extractor/tests/flow/input/declareModuleExports.js b/javascript/extractor/tests/flow/input/declareModuleExports.js
new file mode 100644
index 00000000000..36fcc3b70a7
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/declareModuleExports.js
@@ -0,0 +1,4 @@
+declare module 'foo' {
+  declare module.exports: {
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/exportOpaqueType.js b/javascript/extractor/tests/flow/input/exportOpaqueType.js
new file mode 100644
index 00000000000..8a53255a239
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/exportOpaqueType.js
@@ -0,0 +1 @@
+export opaque type num : number = number;
diff --git a/javascript/extractor/tests/flow/input/importType.js b/javascript/extractor/tests/flow/input/importType.js
new file mode 100644
index 00000000000..00c1426201f
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/importType.js
@@ -0,0 +1,2 @@
+import { type, type t1, typeof t2 } from 'm';
+import { type t } from 'n';
diff --git a/javascript/extractor/tests/flow/input/methodTypeParams.js b/javascript/extractor/tests/flow/input/methodTypeParams.js
new file mode 100644
index 00000000000..2bcc4841ae3
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/methodTypeParams.js
@@ -0,0 +1,5 @@
+var o = {
+  id<A>(a : A) {
+    return a;
+  }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/objectTypeSpread.js b/javascript/extractor/tests/flow/input/objectTypeSpread.js
new file mode 100644
index 00000000000..955c4c22272
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/objectTypeSpread.js
@@ -0,0 +1,2 @@
+type A = { x: int };
+type B = { ...A, y: string };
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/input/optParms.js b/javascript/extractor/tests/flow/input/optParms.js
new file mode 100644
index 00000000000..75c2e0c78c6
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/optParms.js
@@ -0,0 +1,2 @@
+let f = (x?) => {};
+let g = (x?, y) => {};
diff --git a/javascript/extractor/tests/flow/input/parmAnonFunctionType.js b/javascript/extractor/tests/flow/input/parmAnonFunctionType.js
new file mode 100644
index 00000000000..9f0766f72d5
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/parmAnonFunctionType.js
@@ -0,0 +1,3 @@
+function f(g: ({y: int}) => void) {
+  g(42);
+}
diff --git a/javascript/extractor/tests/flow/input/qualifiedInterface.js b/javascript/extractor/tests/flow/input/qualifiedInterface.js
new file mode 100644
index 00000000000..efeffb21bda
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/qualifiedInterface.js
@@ -0,0 +1 @@
+interface I extends J.K {}
diff --git a/javascript/extractor/tests/flow/input/tst.js b/javascript/extractor/tests/flow/input/tst.js
new file mode 100644
index 00000000000..98615cc6fc8
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/tst.js
@@ -0,0 +1,22 @@
+type Point = {
+  x: int,
+  y: int
+}
+
+class A<T> {
+  x: T;
+  m() : Point {}
+}
+
+function f() {
+  switch(x) {
+  case (42):
+  }
+}
+
+@SomeDecorator
+type MyPoint = Point
+
+type T1 = {| bar: string |}
+
+type T2 = (| "red" | "green" | "blue")
diff --git a/javascript/extractor/tests/flow/input/variance.js b/javascript/extractor/tests/flow/input/variance.js
new file mode 100644
index 00000000000..eb08b1ff6c3
--- /dev/null
+++ b/javascript/extractor/tests/flow/input/variance.js
@@ -0,0 +1,7 @@
+export type PackagerAsset = {
+  +__packager_asset: boolean,
+};
+
+class Foo {
+  +x: int
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/flow/options.json b/javascript/extractor/tests/flow/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/flow/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/flow/output/trap/anonFunctionOptionalParm.js.trap b/javascript/extractor/tests/flow/output/trap/anonFunctionOptionalParm.js.trap
new file mode 100644
index 00000000000..dc46a3154a1
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/anonFunctionOptionalParm.js.trap
@@ -0,0 +1,166 @@
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+files(#10000,"/anonFunctionOptionalParm.js","anonFunctionOptionalParm","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
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+locations_default(#20051,#10000,1,23,1,22)
+hasLocation(#20050,#20051)
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diff --git a/javascript/extractor/tests/flow/output/trap/anonFunctionReturnType.js.trap b/javascript/extractor/tests/flow/output/trap/anonFunctionReturnType.js.trap
new file mode 100644
index 00000000000..37e401c7c76
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/anonFunctionReturnType.js.trap
@@ -0,0 +1,173 @@
+#10000=@"/anonFunctionReturnType.js;sourcefile"
+files(#10000,"/anonFunctionReturnType.js","anonFunctionReturnType","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
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diff --git a/javascript/extractor/tests/flow/output/trap/anonFunctionWithoutParens.js.trap b/javascript/extractor/tests/flow/output/trap/anonFunctionWithoutParens.js.trap
new file mode 100644
index 00000000000..37086da64b2
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/anonFunctionWithoutParens.js.trap
@@ -0,0 +1,90 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/anonIndexer.js.trap b/javascript/extractor/tests/flow/output/trap/anonIndexer.js.trap
new file mode 100644
index 00000000000..e9948ea3fbb
--- /dev/null
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new file mode 100644
index 00000000000..fc5097763cd
--- /dev/null
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diff --git a/javascript/extractor/tests/flow/output/trap/atAtIteratorProp.js.trap b/javascript/extractor/tests/flow/output/trap/atAtIteratorProp.js.trap
new file mode 100644
index 00000000000..2be5306c0a8
--- /dev/null
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diff --git a/javascript/extractor/tests/flow/output/trap/complexParamTypes.js.trap b/javascript/extractor/tests/flow/output/trap/complexParamTypes.js.trap
new file mode 100644
index 00000000000..380f722d404
--- /dev/null
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diff --git a/javascript/extractor/tests/flow/output/trap/exportOpaqueType.js.trap b/javascript/extractor/tests/flow/output/trap/exportOpaqueType.js.trap
new file mode 100644
index 00000000000..56db77daae3
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/exportOpaqueType.js.trap
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new file mode 100644
index 00000000000..aaafc65c9be
--- /dev/null
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new file mode 100644
index 00000000000..d318d7e3502
--- /dev/null
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diff --git a/javascript/extractor/tests/flow/output/trap/objectTypeSpread.js.trap b/javascript/extractor/tests/flow/output/trap/objectTypeSpread.js.trap
new file mode 100644
index 00000000000..040ab76cb00
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/objectTypeSpread.js.trap
@@ -0,0 +1,148 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/optParms.js.trap b/javascript/extractor/tests/flow/output/trap/optParms.js.trap
new file mode 100644
index 00000000000..818a1af1573
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/optParms.js.trap
@@ -0,0 +1,299 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/parmAnonFunctionType.js.trap b/javascript/extractor/tests/flow/output/trap/parmAnonFunctionType.js.trap
new file mode 100644
index 00000000000..bb99e983717
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/parmAnonFunctionType.js.trap
@@ -0,0 +1,240 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/qualifiedInterface.js.trap b/javascript/extractor/tests/flow/output/trap/qualifiedInterface.js.trap
new file mode 100644
index 00000000000..8eb4ade67ac
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/qualifiedInterface.js.trap
@@ -0,0 +1,78 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/tst.js.trap b/javascript/extractor/tests/flow/output/trap/tst.js.trap
new file mode 100644
index 00000000000..52e2fcd2260
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/tst.js.trap
@@ -0,0 +1,731 @@
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diff --git a/javascript/extractor/tests/flow/output/trap/variance.js.trap b/javascript/extractor/tests/flow/output/trap/variance.js.trap
new file mode 100644
index 00000000000..c3d2ff68ad7
--- /dev/null
+++ b/javascript/extractor/tests/flow/output/trap/variance.js.trap
@@ -0,0 +1,255 @@
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diff --git a/javascript/extractor/tests/functionbind/input/tst.js b/javascript/extractor/tests/functionbind/input/tst.js
new file mode 100644
index 00000000000..72da6afecfe
--- /dev/null
+++ b/javascript/extractor/tests/functionbind/input/tst.js
@@ -0,0 +1,5 @@
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+
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\ No newline at end of file
diff --git a/javascript/extractor/tests/functionbind/options.json b/javascript/extractor/tests/functionbind/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/functionbind/options.json
@@ -0,0 +1,3 @@
+{
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+}
diff --git a/javascript/extractor/tests/functionbind/output/trap/tst.js.trap b/javascript/extractor/tests/functionbind/output/trap/tst.js.trap
new file mode 100644
index 00000000000..2084554fde5
--- /dev/null
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+literals("hasOwnProp","hasOwnProp",#20068)
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+locations_default(#20071,#10000,5,17,5,19)
+hasLocation(#20070,#20071)
+enclosingStmt(#20070,#20060)
+exprContainers(#20070,#20001)
+literals("x","""x""",#20070)
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+lines(#20072,#20001,"process.argv.map(::console.log);","
+")
+hasLocation(#20072,#20006)
+#20073=*
+lines(#20073,#20001,"","
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+locations_default(#20074,#10000,2,1,2,0)
+hasLocation(#20073,#20074)
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+lines(#20075,#20001,"let hasOwnProp = Object.prototype.hasOwnProperty;","
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+lines(#20076,#20001,"let obj = { x: 100 };","
+")
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+#20077=*
+lines(#20077,#20001,"obj::hasOwnProp(""x"");","")
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+numlines(#20001,5,4,0)
+#20078=*
+tokeninfo(#20078,6,#20001,0,"process")
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+#20079=*
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+locations_default(#20080,#10000,1,8,1,8)
+hasLocation(#20079,#20080)
+#20081=*
+tokeninfo(#20081,6,#20001,2,"argv")
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+#20082=*
+tokeninfo(#20082,8,#20001,3,".")
+#20083=@"loc,{#10000},1,13,1,13"
+locations_default(#20083,#10000,1,13,1,13)
+hasLocation(#20082,#20083)
+#20084=*
+tokeninfo(#20084,6,#20001,4,"map")
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+#20085=*
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+#20086=@"loc,{#10000},1,17,1,17"
+locations_default(#20086,#10000,1,17,1,17)
+hasLocation(#20085,#20086)
+#20087=*
+tokeninfo(#20087,8,#20001,6,"::")
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+locations_default(#20088,#10000,1,18,1,19)
+hasLocation(#20087,#20088)
+#20089=*
+tokeninfo(#20089,6,#20001,7,"console")
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+#20090=*
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+#20092=*
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+#20119=*
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+#20122=*
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+#20126=*
+tokeninfo(#20126,6,#20001,30,"obj")
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+#20127=*
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+#20128=@"loc,{#10000},5,4,5,5"
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+#20129=*
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+#20132=*
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+locations_default(#20138,#10000,5,22,5,21)
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+#20140=@"loc,{#10000},1,1,1,0"
+locations_default(#20140,#10000,1,1,1,0)
+hasLocation(#20139,#20140)
+#20141=*
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+hasLocation(#20141,#20138)
+successor(#20060,#20066)
+successor(#20070,#20062)
+successor(#20068,#20064)
+successor(#20066,#20068)
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+successor(#20062,#20141)
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+successor(#20054,#20048)
+successor(#20050,#20052)
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+successor(#20029,#20033)
+successor(#20044,#20035)
+successor(#20042,#20037)
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+successor(#20035,#20031)
+successor(#20033,#20039)
+successor(#20031,#20046)
+successor(#20005,#20013)
+successor(#20027,#20022)
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+successor(#20022,#20020)
+successor(#20020,#20007)
+successor(#20018,#20009)
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+successor(#20013,#20016)
+successor(#20011,#20018)
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+successor(#20007,#20029)
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+numlines(#10000,5,4,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/helloworld/input/hello.js b/javascript/extractor/tests/helloworld/input/hello.js
new file mode 100644
index 00000000000..fc7084624d5
--- /dev/null
+++ b/javascript/extractor/tests/helloworld/input/hello.js
@@ -0,0 +1 @@
+alert("Hello, world!");
\ No newline at end of file
diff --git a/javascript/extractor/tests/helloworld/output/trap/hello.js.trap b/javascript/extractor/tests/helloworld/output/trap/hello.js.trap
new file mode 100644
index 00000000000..17566af6556
--- /dev/null
+++ b/javascript/extractor/tests/helloworld/output/trap/hello.js.trap
@@ -0,0 +1,90 @@
+#10000=@"/hello.js;sourcefile"
+files(#10000,"/hello.js","hello","js",0)
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+folders(#10001,"/","")
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+stmtContainers(#20003,#20001)
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+#20005=@"loc,{#10000},1,1,1,22"
+locations_default(#20005,#10000,1,1,1,22)
+hasLocation(#20004,#20005)
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+exprs(#20006,79,#20004,-1,"alert")
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+locations_default(#20007,#10000,1,1,1,5)
+hasLocation(#20006,#20007)
+enclosingStmt(#20006,#20003)
+exprContainers(#20006,#20001)
+literals("alert","alert",#20006)
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+variables(#20008,"alert",#20000)
+bind(#20006,#20008)
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+exprs(#20009,4,#20004,0,"""Hello, world!""")
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+locations_default(#20010,#10000,1,7,1,21)
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+enclosingStmt(#20009,#20003)
+exprContainers(#20009,#20001)
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+#20011=*
+lines(#20011,#20001,"alert(""Hello, world!"");","")
+hasLocation(#20011,#20002)
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+#20023=@"loc,{#10000},1,1,1,0"
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+hasLocation(#20024,#20021)
+successor(#20003,#20006)
+successor(#20009,#20004)
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diff --git a/javascript/extractor/tests/html-text-extraction/input/text-examples.html b/javascript/extractor/tests/html-text-extraction/input/text-examples.html
new file mode 100644
index 00000000000..4c69b8a6c3e
--- /dev/null
+++ b/javascript/extractor/tests/html-text-extraction/input/text-examples.html
@@ -0,0 +1,25 @@
+<html>
+   <head>
+      <title></title>
+   </head>
+   <body>
+      text1
+      <div/>
+      text2
+      <div>
+      text3
+      <div>text4</div>
+      text5
+      <div/>
+      text6
+      <div/>text7</div>
+      text8<![CDATA[text9]]>text10<![CDATA[text11]]><![CDATA[text12]]>text13
+      <div/>
+      <div/>
+      <!-- This is a comment -->
+      <div/>
+      text14
+      <div>entity1: &amp; entity2: &gt; entity3: &lt; entity4: &#38; entity5: &#62; entity6: &#60;</div>
+      <![CDATA[non-entity1: &amp; non-entity2: &gt; non-entity3: &lt;]]>
+   </body>
+</html>
diff --git a/javascript/extractor/tests/html-text-extraction/options.json b/javascript/extractor/tests/html-text-extraction/options.json
new file mode 100644
index 00000000000..6230811198f
--- /dev/null
+++ b/javascript/extractor/tests/html-text-extraction/options.json
@@ -0,0 +1,3 @@
+{
+    "html": "all"
+}
diff --git a/javascript/extractor/tests/html-text-extraction/output/trap/text-examples.html.trap b/javascript/extractor/tests/html-text-extraction/output/trap/text-examples.html.trap
new file mode 100644
index 00000000000..022f91fa9e6
--- /dev/null
+++ b/javascript/extractor/tests/html-text-extraction/output/trap/text-examples.html.trap
@@ -0,0 +1,242 @@
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+files(#10000,"/text-examples.html","text-examples","html",0)
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+folders(#10001,"/","")
+containerparent(#10001,#10000)
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+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+xmlElements(#20001,"html",#10000,0,#10000)
+#20002=@"loc,{#10000},1,1,25,7"
+locations_default(#20002,#10000,1,1,25,7)
+xmllocations(#20001,#20002)
+#20003=*
+xmlChars(#20003,"
+",#10000,1,0,#10000)
+#20004=@"loc,{#10000},25,8,25,8"
+locations_default(#20004,#10000,25,8,25,8)
+xmllocations(#20003,#20004)
+#20005=*
+xmlChars(#20005,"
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+locations_default(#20006,#10000,1,7,2,3)
+xmllocations(#20005,#20006)
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+locations_default(#20008,#10000,2,4,4,10)
+xmllocations(#20007,#20008)
+#20009=*
+xmlChars(#20009,"
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+locations_default(#20010,#10000,4,11,5,3)
+xmllocations(#20009,#20010)
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+xmllocations(#20011,#20012)
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+xmllocations(#20015,#20016)
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+#20019=*
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+#20021=*
+xmlChars(#20021,"
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+      ",#20011,0,0,#10000)
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+      text3
+      ",#20011,4,0,#10000)
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+#20033=*
+xmlChars(#20033,"
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+      ",#20011,6,0,#10000)
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+#20035=*
+xmlElements(#20035,"div",#20011,7,#10000)
+#20036=@"loc,{#10000},13,7,13,12"
+locations_default(#20036,#10000,13,7,13,12)
+xmllocations(#20035,#20036)
+#20037=*
+xmlChars(#20037,"
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+      ",#20011,8,0,#10000)
+#20038=@"loc,{#10000},13,13,15,6"
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+xmllocations(#20037,#20038)
+#20039=*
+xmlElements(#20039,"div",#20011,9,#10000)
+#20040=@"loc,{#10000},15,7,15,23"
+locations_default(#20040,#10000,15,7,15,23)
+xmllocations(#20039,#20040)
+#20041=*
+xmlChars(#20041,"
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+#20042=@"loc,{#10000},15,24,16,11"
+locations_default(#20042,#10000,15,24,16,11)
+xmllocations(#20041,#20042)
+#20043=*
+xmlChars(#20043,"text9",#20011,11,1,#10000)
+#20044=@"loc,{#10000},16,21,16,25"
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+xmllocations(#20043,#20044)
+#20045=*
+xmlChars(#20045,"text10",#20011,12,0,#10000)
+#20046=@"loc,{#10000},16,29,16,34"
+locations_default(#20046,#10000,16,29,16,34)
+xmllocations(#20045,#20046)
+#20047=*
+xmlChars(#20047,"text11",#20011,13,1,#10000)
+#20048=@"loc,{#10000},16,44,16,49"
+locations_default(#20048,#10000,16,44,16,49)
+xmllocations(#20047,#20048)
+#20049=*
+xmlChars(#20049,"text12",#20011,14,1,#10000)
+#20050=@"loc,{#10000},16,62,16,67"
+locations_default(#20050,#10000,16,62,16,67)
+xmllocations(#20049,#20050)
+#20051=*
+xmlChars(#20051,"text13
+      ",#20011,15,0,#10000)
+#20052=@"loc,{#10000},16,71,17,6"
+locations_default(#20052,#10000,16,71,17,6)
+xmllocations(#20051,#20052)
+#20053=*
+xmlElements(#20053,"div",#20011,16,#10000)
+#20054=@"loc,{#10000},17,7,17,12"
+locations_default(#20054,#10000,17,7,17,12)
+xmllocations(#20053,#20054)
+#20055=*
+xmlChars(#20055,"
+      ",#20011,17,0,#10000)
+#20056=@"loc,{#10000},17,13,18,6"
+locations_default(#20056,#10000,17,13,18,6)
+xmllocations(#20055,#20056)
+#20057=*
+xmlElements(#20057,"div",#20011,18,#10000)
+#20058=@"loc,{#10000},18,7,18,12"
+locations_default(#20058,#10000,18,7,18,12)
+xmllocations(#20057,#20058)
+#20059=*
+xmlChars(#20059,"
+      ",#20011,19,0,#10000)
+#20060=@"loc,{#10000},18,13,19,6"
+locations_default(#20060,#10000,18,13,19,6)
+xmllocations(#20059,#20060)
+#20061=*
+xmlComments(#20061,"<!-- This is a comment -->",#20011,#10000)
+#20062=@"loc,{#10000},19,7,19,32"
+locations_default(#20062,#10000,19,7,19,32)
+xmllocations(#20061,#20062)
+#20063=*
+xmlChars(#20063,"
+      ",#20011,20,0,#10000)
+#20064=@"loc,{#10000},19,33,20,6"
+locations_default(#20064,#10000,19,33,20,6)
+xmllocations(#20063,#20064)
+#20065=*
+xmlElements(#20065,"div",#20011,21,#10000)
+#20066=@"loc,{#10000},20,7,20,12"
+locations_default(#20066,#10000,20,7,20,12)
+xmllocations(#20065,#20066)
+#20067=*
+xmlChars(#20067,"
+      text14
+      ",#20011,22,0,#10000)
+#20068=@"loc,{#10000},20,13,22,6"
+locations_default(#20068,#10000,20,13,22,6)
+xmllocations(#20067,#20068)
+#20069=*
+xmlElements(#20069,"div",#20011,23,#10000)
+#20070=@"loc,{#10000},22,7,22,104"
+locations_default(#20070,#10000,22,7,22,104)
+xmllocations(#20069,#20070)
+#20071=*
+xmlChars(#20071,"
+      ",#20011,24,0,#10000)
+#20072=@"loc,{#10000},22,105,23,6"
+locations_default(#20072,#10000,22,105,23,6)
+xmllocations(#20071,#20072)
+#20073=*
+xmlChars(#20073,"non-entity1: &amp; non-entity2: &gt; non-entity3: &lt;",#20011,25,1,#10000)
+#20074=@"loc,{#10000},23,16,23,69"
+locations_default(#20074,#10000,23,16,23,69)
+xmllocations(#20073,#20074)
+#20075=*
+xmlChars(#20075,"
+   ",#20011,26,0,#10000)
+#20076=@"loc,{#10000},23,73,24,3"
+locations_default(#20076,#10000,23,73,24,3)
+xmllocations(#20075,#20076)
+#20077=*
+xmlChars(#20077,"text4",#20031,0,0,#10000)
+#20078=@"loc,{#10000},11,12,11,16"
+locations_default(#20078,#10000,11,12,11,16)
+xmllocations(#20077,#20078)
+#20079=*
+xmlChars(#20079,"text7",#20039,0,0,#10000)
+#20080=@"loc,{#10000},15,13,15,17"
+locations_default(#20080,#10000,15,13,15,17)
+xmllocations(#20079,#20080)
+#20081=*
+xmlChars(#20081,"entity1: & entity2: > entity3: < entity4: & entity5: > entity6: <",#20069,0,0,#10000)
+#20082=@"loc,{#10000},22,12,22,98"
+locations_default(#20082,#10000,22,12,22,98)
+xmllocations(#20081,#20082)
+numlines(#10000,25,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/input/doctype.html b/javascript/extractor/tests/html/input/doctype.html
new file mode 100644
index 00000000000..0e76edd65b7
--- /dev/null
+++ b/javascript/extractor/tests/html/input/doctype.html
@@ -0,0 +1 @@
+<!DOCTYPE html>
diff --git a/javascript/extractor/tests/html/input/empty_script.html b/javascript/extractor/tests/html/input/empty_script.html
new file mode 100644
index 00000000000..f2b112da655
--- /dev/null
+++ b/javascript/extractor/tests/html/input/empty_script.html
@@ -0,0 +1,6 @@
+<html>
+  <head>
+    <script type="text/javascript" charset="utf-8">
+    </script>
+  </head>
+</html>
diff --git a/javascript/extractor/tests/html/input/entities.html b/javascript/extractor/tests/html/input/entities.html
new file mode 100644
index 00000000000..13977d98e84
--- /dev/null
+++ b/javascript/extractor/tests/html/input/entities.html
@@ -0,0 +1,8 @@
+<html>
+    <head>
+        <title>Test page</title>
+    </head>
+    <body>
+        <a href="jav&#97;script:void(alert(&#x0022;Nope!&quot;))">click here</a>
+    </body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/html/input/module.html b/javascript/extractor/tests/html/input/module.html
new file mode 100644
index 00000000000..d5abf9708e8
--- /dev/null
+++ b/javascript/extractor/tests/html/input/module.html
@@ -0,0 +1,11 @@
+<html>
+    <head>
+        <title>Test page</title>
+        <script type="module">
+            import foo from 'bar';
+            foo.baz();
+        </script>
+    </head>
+    <body>
+    </body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/html/input/q.html b/javascript/extractor/tests/html/input/q.html
new file mode 100644
index 00000000000..3a6f8b8c0c9
--- /dev/null
+++ b/javascript/extractor/tests/html/input/q.html
@@ -0,0 +1,8 @@
+<html>
+  <body>
+    <p>
+      <input type="button" value="Test" onClick="">
+    </p>
+  </body>
+</html>
+  
diff --git a/javascript/extractor/tests/html/input/tst.html b/javascript/extractor/tests/html/input/tst.html
new file mode 100644
index 00000000000..3113fce38cd
--- /dev/null
+++ b/javascript/extractor/tests/html/input/tst.html
@@ -0,0 +1,18 @@
+<html>
+    <head>
+        <title>Test page</title>
+        <script src="external.js"></script>
+        <script>
+            alert("Hello, world!");
+        </script>
+        <script>;</script>
+    </head>
+    <body>
+        <a href="javascript:void(alert('Nope!'))">click here</a>
+        <div onclick="alert('I said don\'t click!')">don't click here</div>
+        <a onclick="return false;">can't click this one</a>
+    </body>
+    <script type="text/x-handlebars-template">Hello, {{name}}!</script>
+    <script TYPE="text/x-handlebars-template">HELLO, {{name}}!</script>
+    <script type=''></script>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/html/input/tst.xhtml b/javascript/extractor/tests/html/input/tst.xhtml
new file mode 100644
index 00000000000..c7fe7141b43
--- /dev/null
+++ b/javascript/extractor/tests/html/input/tst.xhtml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
+<head>
+    <title>Example page</title>
+</head>
+<body>
+    <script type="application/javascript">
+    <![CDATA[ 
+    42;
+    ]]></script>
+</body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/html/input/tst2.html b/javascript/extractor/tests/html/input/tst2.html
new file mode 100644
index 00000000000..16dbbe10fcb
--- /dev/null
+++ b/javascript/extractor/tests/html/input/tst2.html
@@ -0,0 +1,10 @@
+<html>
+    <script type="text/babel">var hello;</script>
+    <script type="text/jsx">var world;</script>
+    <script type="text/babel" data-plugins="transform-es2015-modules-umd">
+      var inAModule;
+    </script>
+    <script type="text/babel" data-plugins="transform-es2015-modules-umd">
+      import f from "f"
+    </script>
+</html>
diff --git a/javascript/extractor/tests/html/input/tst2.xhtml b/javascript/extractor/tests/html/input/tst2.xhtml
new file mode 100644
index 00000000000..77585ef028c
--- /dev/null
+++ b/javascript/extractor/tests/html/input/tst2.xhtml
@@ -0,0 +1,8 @@
+<?xml version="1.0"?>
+<html>
+  <head>
+    <script src="svgunit.js"/>
+    <script></script>
+  </head>
+  <body/>
+</html>
diff --git a/javascript/extractor/tests/html/output/trap/doctype.html.trap b/javascript/extractor/tests/html/output/trap/doctype.html.trap
new file mode 100644
index 00000000000..2624d53f031
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/doctype.html.trap
@@ -0,0 +1,12 @@
+#10000=@"/doctype.html;sourcefile"
+files(#10000,"/doctype.html","doctype","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/empty_script.html.trap b/javascript/extractor/tests/html/output/trap/empty_script.html.trap
new file mode 100644
index 00000000000..bcb4c5adf87
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/empty_script.html.trap
@@ -0,0 +1,37 @@
+#10000=@"/empty_script.html;sourcefile"
+files(#10000,"/empty_script.html","empty_script","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+xmlElements(#20001,"html",#10000,0,#10000)
+#20002=@"loc,{#10000},1,1,6,7"
+locations_default(#20002,#10000,1,1,6,7)
+xmllocations(#20001,#20002)
+#20003=*
+xmlElements(#20003,"head",#20001,0,#10000)
+#20004=@"loc,{#10000},2,3,5,9"
+locations_default(#20004,#10000,2,3,5,9)
+xmllocations(#20003,#20004)
+#20005=*
+xmlElements(#20005,"script",#20003,0,#10000)
+#20006=@"loc,{#10000},3,5,4,13"
+locations_default(#20006,#10000,3,5,4,13)
+xmllocations(#20005,#20006)
+#20007=*
+xmlAttrs(#20007,#20005,"type","text/javascript",0,#10000)
+#20008=@"loc,{#10000},3,13,3,34"
+locations_default(#20008,#10000,3,13,3,34)
+xmllocations(#20007,#20008)
+#20009=*
+xmlAttrs(#20009,#20005,"charset","utf-8",1,#10000)
+#20010=@"loc,{#10000},3,36,3,50"
+locations_default(#20010,#10000,3,36,3,50)
+xmllocations(#20009,#20010)
+numlines(#10000,6,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/entities.html.trap b/javascript/extractor/tests/html/output/trap/entities.html.trap
new file mode 100644
index 00000000000..61b8c18ec49
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/entities.html.trap
@@ -0,0 +1,144 @@
+#10000=@"/entities.html;sourcefile"
+files(#10000,"/entities.html","entities","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},6,29"
+toplevels(#20001,3)
+#20002=@"loc,{#10000},6,29,6,48"
+locations_default(#20002,#10000,6,29,6,48)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"void(alert(""Nope!""))")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,21,#20003,0,"void(alert(""Nope!""))")
+hasLocation(#20004,#20002)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+#20005=*
+exprs(#20005,63,#20004,0,"(alert(""Nope!""))")
+#20006=@"loc,{#10000},6,33,6,48"
+locations_default(#20006,#10000,6,33,6,48)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,13,#20005,0,"alert(""Nope!"")")
+#20008=@"loc,{#10000},6,34,6,47"
+locations_default(#20008,#10000,6,34,6,47)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+#20009=*
+exprs(#20009,79,#20007,-1,"alert")
+#20010=@"loc,{#10000},6,34,6,38"
+locations_default(#20010,#10000,6,34,6,38)
+hasLocation(#20009,#20010)
+enclosingStmt(#20009,#20003)
+exprContainers(#20009,#20001)
+literals("alert","alert",#20009)
+#20011=@"var;{alert};{#20000}"
+variables(#20011,"alert",#20000)
+bind(#20009,#20011)
+#20012=*
+exprs(#20012,4,#20007,0,"""Nope!""")
+#20013=@"loc,{#10000},6,40,6,46"
+locations_default(#20013,#10000,6,40,6,46)
+hasLocation(#20012,#20013)
+enclosingStmt(#20012,#20003)
+exprContainers(#20012,#20001)
+literals("Nope!","""Nope!""",#20012)
+#20014=*
+lines(#20014,#20001,"void(alert(""Nope!""))","")
+hasLocation(#20014,#20002)
+numlines(#20001,1,1,0)
+#20015=*
+tokeninfo(#20015,7,#20001,0,"void")
+#20016=@"loc,{#10000},6,29,6,32"
+locations_default(#20016,#10000,6,29,6,32)
+hasLocation(#20015,#20016)
+#20017=*
+tokeninfo(#20017,8,#20001,1,"(")
+#20018=@"loc,{#10000},6,33,6,33"
+locations_default(#20018,#10000,6,33,6,33)
+hasLocation(#20017,#20018)
+#20019=*
+tokeninfo(#20019,6,#20001,2,"alert")
+hasLocation(#20019,#20010)
+#20020=*
+tokeninfo(#20020,8,#20001,3,"(")
+#20021=@"loc,{#10000},6,39,6,39"
+locations_default(#20021,#10000,6,39,6,39)
+hasLocation(#20020,#20021)
+#20022=*
+tokeninfo(#20022,4,#20001,4,"""Nope!""")
+hasLocation(#20022,#20013)
+#20023=*
+tokeninfo(#20023,8,#20001,5,")")
+#20024=@"loc,{#10000},6,47,6,47"
+locations_default(#20024,#10000,6,47,6,47)
+hasLocation(#20023,#20024)
+#20025=*
+tokeninfo(#20025,8,#20001,6,")")
+#20026=@"loc,{#10000},6,48,6,48"
+locations_default(#20026,#10000,6,48,6,48)
+hasLocation(#20025,#20026)
+#20027=*
+tokeninfo(#20027,0,#20001,7,"")
+#20028=@"loc,{#10000},6,49,6,48"
+locations_default(#20028,#10000,6,49,6,48)
+hasLocation(#20027,#20028)
+#20029=*
+entry_cfg_node(#20029,#20001)
+#20030=@"loc,{#10000},6,29,6,28"
+locations_default(#20030,#10000,6,29,6,28)
+hasLocation(#20029,#20030)
+#20031=*
+exit_cfg_node(#20031,#20001)
+hasLocation(#20031,#20028)
+successor(#20003,#20005)
+successor(#20005,#20009)
+successor(#20012,#20007)
+successor(#20009,#20012)
+successor(#20007,#20004)
+successor(#20004,#20031)
+successor(#20029,#20003)
+#20032=*
+xmlElements(#20032,"html",#10000,0,#10000)
+#20033=@"loc,{#10000},1,1,8,7"
+locations_default(#20033,#10000,1,1,8,7)
+xmllocations(#20032,#20033)
+#20034=*
+xmlElements(#20034,"head",#20032,0,#10000)
+#20035=@"loc,{#10000},2,5,4,11"
+locations_default(#20035,#10000,2,5,4,11)
+xmllocations(#20034,#20035)
+#20036=*
+xmlElements(#20036,"body",#20032,1,#10000)
+#20037=@"loc,{#10000},5,5,7,11"
+locations_default(#20037,#10000,5,5,7,11)
+xmllocations(#20036,#20037)
+#20038=*
+xmlElements(#20038,"title",#20034,0,#10000)
+#20039=@"loc,{#10000},3,9,3,32"
+locations_default(#20039,#10000,3,9,3,32)
+xmllocations(#20038,#20039)
+#20040=*
+xmlElements(#20040,"a",#20036,0,#10000)
+#20041=@"loc,{#10000},6,9,6,80"
+locations_default(#20041,#10000,6,9,6,80)
+xmllocations(#20040,#20041)
+#20042=*
+xmlAttrs(#20042,#20040,"href","javascript:void(alert(""Nope!""))",0,#10000)
+#20043=@"loc,{#10000},6,12,6,65"
+locations_default(#20043,#10000,6,12,6,65)
+xmllocations(#20042,#20043)
+numlines(#10000,8,1,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/module.html.trap b/javascript/extractor/tests/html/output/trap/module.html.trap
new file mode 100644
index 00000000000..848f05a4e1f
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/module.html.trap
@@ -0,0 +1,220 @@
+#10000=@"/module.html;sourcefile"
+files(#10000,"/module.html","module","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},4,31"
+toplevels(#20001,1)
+#20002=@"loc,{#10000},4,31,7,8"
+locations_default(#20002,#10000,4,31,7,8)
+hasLocation(#20001,#20002)
+#20003=@"module;{#10000},4,31"
+scopes(#20003,3)
+scopenodes(#20001,#20003)
+scopenesting(#20003,#20000)
+isModule(#20001)
+#20004=@"var;{foo};{#20003}"
+variables(#20004,"foo",#20003)
+#20005=@"local_type_name;{foo};{#20003}"
+local_type_names(#20005,"foo",#20003)
+#20006=@"local_namespace_name;{foo};{#20003}"
+local_namespace_names(#20006,"foo",#20003)
+variables(#20004,"foo",#20003)
+local_type_names(#20005,"foo",#20003)
+local_namespace_names(#20006,"foo",#20003)
+#20007=*
+stmts(#20007,27,#20001,0,"import  ...  'bar';")
+#20008=@"loc,{#10000},5,13,5,34"
+locations_default(#20008,#10000,5,13,5,34)
+hasLocation(#20007,#20008)
+stmtContainers(#20007,#20001)
+#20009=*
+exprs(#20009,4,#20007,-1,"'bar'")
+#20010=@"loc,{#10000},5,29,5,33"
+locations_default(#20010,#10000,5,29,5,33)
+hasLocation(#20009,#20010)
+enclosingStmt(#20009,#20007)
+exprContainers(#20009,#20001)
+literals("bar","'bar'",#20009)
+#20011=*
+exprs(#20011,84,#20007,0,"foo")
+#20012=@"loc,{#10000},5,20,5,22"
+locations_default(#20012,#10000,5,20,5,22)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20007)
+exprContainers(#20011,#20001)
+#20013=*
+exprs(#20013,78,#20011,1,"foo")
+hasLocation(#20013,#20012)
+enclosingStmt(#20013,#20007)
+exprContainers(#20013,#20001)
+literals("foo","foo",#20013)
+decl(#20013,#20004)
+typedecl(#20013,#20005)
+namespacedecl(#20013,#20006)
+#20014=*
+stmts(#20014,2,#20001,1,"foo.baz();")
+#20015=@"loc,{#10000},6,13,6,22"
+locations_default(#20015,#10000,6,13,6,22)
+hasLocation(#20014,#20015)
+stmtContainers(#20014,#20001)
+#20016=*
+exprs(#20016,13,#20014,0,"foo.baz()")
+#20017=@"loc,{#10000},6,13,6,21"
+locations_default(#20017,#10000,6,13,6,21)
+hasLocation(#20016,#20017)
+enclosingStmt(#20016,#20014)
+exprContainers(#20016,#20001)
+#20018=*
+exprs(#20018,14,#20016,-1,"foo.baz")
+#20019=@"loc,{#10000},6,13,6,19"
+locations_default(#20019,#10000,6,13,6,19)
+hasLocation(#20018,#20019)
+enclosingStmt(#20018,#20014)
+exprContainers(#20018,#20001)
+#20020=*
+exprs(#20020,79,#20018,0,"foo")
+#20021=@"loc,{#10000},6,13,6,15"
+locations_default(#20021,#10000,6,13,6,15)
+hasLocation(#20020,#20021)
+enclosingStmt(#20020,#20014)
+exprContainers(#20020,#20001)
+literals("foo","foo",#20020)
+bind(#20020,#20004)
+#20022=*
+exprs(#20022,0,#20018,1,"baz")
+#20023=@"loc,{#10000},6,17,6,19"
+locations_default(#20023,#10000,6,17,6,19)
+hasLocation(#20022,#20023)
+enclosingStmt(#20022,#20014)
+exprContainers(#20022,#20001)
+literals("baz","baz",#20022)
+#20024=*
+lines(#20024,#20001,"","
+")
+#20025=@"loc,{#10000},4,31,4,30"
+locations_default(#20025,#10000,4,31,4,30)
+hasLocation(#20024,#20025)
+#20026=*
+lines(#20026,#20001,"            import foo from 'bar';","
+")
+#20027=@"loc,{#10000},5,1,5,34"
+locations_default(#20027,#10000,5,1,5,34)
+hasLocation(#20026,#20027)
+indentation(#10000,5," ",12)
+#20028=*
+lines(#20028,#20001,"            foo.baz();","
+")
+#20029=@"loc,{#10000},6,1,6,22"
+locations_default(#20029,#10000,6,1,6,22)
+hasLocation(#20028,#20029)
+indentation(#10000,6," ",12)
+#20030=*
+lines(#20030,#20001,"        ","")
+#20031=@"loc,{#10000},7,1,7,8"
+locations_default(#20031,#10000,7,1,7,8)
+hasLocation(#20030,#20031)
+numlines(#20001,4,2,0)
+#20032=*
+tokeninfo(#20032,7,#20001,0,"import")
+#20033=@"loc,{#10000},5,13,5,18"
+locations_default(#20033,#10000,5,13,5,18)
+hasLocation(#20032,#20033)
+#20034=*
+tokeninfo(#20034,6,#20001,1,"foo")
+hasLocation(#20034,#20012)
+#20035=*
+tokeninfo(#20035,6,#20001,2,"from")
+#20036=@"loc,{#10000},5,24,5,27"
+locations_default(#20036,#10000,5,24,5,27)
+hasLocation(#20035,#20036)
+#20037=*
+tokeninfo(#20037,4,#20001,3,"'bar'")
+hasLocation(#20037,#20010)
+#20038=*
+tokeninfo(#20038,8,#20001,4,";")
+#20039=@"loc,{#10000},5,34,5,34"
+locations_default(#20039,#10000,5,34,5,34)
+hasLocation(#20038,#20039)
+#20040=*
+tokeninfo(#20040,6,#20001,5,"foo")
+hasLocation(#20040,#20021)
+#20041=*
+tokeninfo(#20041,8,#20001,6,".")
+#20042=@"loc,{#10000},6,16,6,16"
+locations_default(#20042,#10000,6,16,6,16)
+hasLocation(#20041,#20042)
+#20043=*
+tokeninfo(#20043,6,#20001,7,"baz")
+hasLocation(#20043,#20023)
+#20044=*
+tokeninfo(#20044,8,#20001,8,"(")
+#20045=@"loc,{#10000},6,20,6,20"
+locations_default(#20045,#10000,6,20,6,20)
+hasLocation(#20044,#20045)
+#20046=*
+tokeninfo(#20046,8,#20001,9,")")
+#20047=@"loc,{#10000},6,21,6,21"
+locations_default(#20047,#10000,6,21,6,21)
+hasLocation(#20046,#20047)
+#20048=*
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+#20049=@"loc,{#10000},6,22,6,22"
+locations_default(#20049,#10000,6,22,6,22)
+hasLocation(#20048,#20049)
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+#20051=@"loc,{#10000},7,9,7,8"
+locations_default(#20051,#10000,7,9,7,8)
+hasLocation(#20050,#20051)
+#20052=*
+entry_cfg_node(#20052,#20001)
+hasLocation(#20052,#20025)
+#20053=*
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+hasLocation(#20053,#20051)
+successor(#20014,#20020)
+successor(#20022,#20018)
+successor(#20020,#20022)
+successor(#20018,#20016)
+successor(#20016,#20053)
+successor(#20007,#20014)
+successor(#20011,#20007)
+successor(#20052,#20011)
+#20054=*
+xmlElements(#20054,"html",#10000,0,#10000)
+#20055=@"loc,{#10000},1,1,11,7"
+locations_default(#20055,#10000,1,1,11,7)
+xmllocations(#20054,#20055)
+#20056=*
+xmlElements(#20056,"head",#20054,0,#10000)
+#20057=@"loc,{#10000},2,5,8,11"
+locations_default(#20057,#10000,2,5,8,11)
+xmllocations(#20056,#20057)
+#20058=*
+xmlElements(#20058,"body",#20054,1,#10000)
+#20059=@"loc,{#10000},9,5,10,11"
+locations_default(#20059,#10000,9,5,10,11)
+xmllocations(#20058,#20059)
+#20060=*
+xmlElements(#20060,"title",#20056,0,#10000)
+#20061=@"loc,{#10000},3,9,3,32"
+locations_default(#20061,#10000,3,9,3,32)
+xmllocations(#20060,#20061)
+#20062=*
+xmlElements(#20062,"script",#20056,1,#10000)
+#20063=@"loc,{#10000},4,9,7,17"
+locations_default(#20063,#10000,4,9,7,17)
+xmllocations(#20062,#20063)
+#20064=*
+xmlAttrs(#20064,#20062,"type","module",0,#10000)
+#20065=@"loc,{#10000},4,17,4,29"
+locations_default(#20065,#10000,4,17,4,29)
+xmllocations(#20064,#20065)
+numlines(#10000,11,2,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/q.html.trap b/javascript/extractor/tests/html/output/trap/q.html.trap
new file mode 100644
index 00000000000..ebf42cf0b91
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/q.html.trap
@@ -0,0 +1,47 @@
+#10000=@"/q.html;sourcefile"
+files(#10000,"/q.html","q","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+xmlElements(#20001,"html",#10000,0,#10000)
+#20002=@"loc,{#10000},1,1,7,7"
+locations_default(#20002,#10000,1,1,7,7)
+xmllocations(#20001,#20002)
+#20003=*
+xmlElements(#20003,"body",#20001,0,#10000)
+#20004=@"loc,{#10000},2,3,6,9"
+locations_default(#20004,#10000,2,3,6,9)
+xmllocations(#20003,#20004)
+#20005=*
+xmlElements(#20005,"p",#20003,0,#10000)
+#20006=@"loc,{#10000},3,5,5,8"
+locations_default(#20006,#10000,3,5,5,8)
+xmllocations(#20005,#20006)
+#20007=*
+xmlElements(#20007,"input",#20005,0,#10000)
+#20008=@"loc,{#10000},4,7,4,51"
+locations_default(#20008,#10000,4,7,4,51)
+xmllocations(#20007,#20008)
+#20009=*
+xmlAttrs(#20009,#20007,"type","button",0,#10000)
+#20010=@"loc,{#10000},4,14,4,26"
+locations_default(#20010,#10000,4,14,4,26)
+xmllocations(#20009,#20010)
+#20011=*
+xmlAttrs(#20011,#20007,"value","Test",1,#10000)
+#20012=@"loc,{#10000},4,28,4,39"
+locations_default(#20012,#10000,4,28,4,39)
+xmllocations(#20011,#20012)
+#20013=*
+xmlAttrs(#20013,#20007,"onClick","",2,#10000)
+#20014=@"loc,{#10000},4,41,4,50"
+locations_default(#20014,#10000,4,41,4,50)
+xmllocations(#20013,#20014)
+numlines(#10000,8,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/tst.html.trap b/javascript/extractor/tests/html/output/trap/tst.html.trap
new file mode 100644
index 00000000000..e6b3a2a119b
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/tst.html.trap
@@ -0,0 +1,455 @@
+#10000=@"/tst.html;sourcefile"
+files(#10000,"/tst.html","tst","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},5,17"
+toplevels(#20001,1)
+#20002=@"loc,{#10000},5,17,7,8"
+locations_default(#20002,#10000,5,17,7,8)
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+#20003=*
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+#20004=@"loc,{#10000},6,13,6,35"
+locations_default(#20004,#10000,6,13,6,35)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
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+#20006=@"loc,{#10000},6,13,6,34"
+locations_default(#20006,#10000,6,13,6,34)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,79,#20005,-1,"alert")
+#20008=@"loc,{#10000},6,13,6,17"
+locations_default(#20008,#10000,6,13,6,17)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("alert","alert",#20007)
+#20009=@"var;{alert};{#20000}"
+variables(#20009,"alert",#20000)
+bind(#20007,#20009)
+#20010=*
+exprs(#20010,4,#20005,0,"""Hello, world!""")
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+locations_default(#20011,#10000,6,19,6,33)
+hasLocation(#20010,#20011)
+enclosingStmt(#20010,#20003)
+exprContainers(#20010,#20001)
+literals("Hello, world!","""Hello, world!""",#20010)
+#20012=*
+lines(#20012,#20001,"","
+")
+#20013=@"loc,{#10000},5,17,5,16"
+locations_default(#20013,#10000,5,17,5,16)
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+#20014=*
+lines(#20014,#20001,"            alert(""Hello, world!"");","
+")
+#20015=@"loc,{#10000},6,1,6,35"
+locations_default(#20015,#10000,6,1,6,35)
+hasLocation(#20014,#20015)
+indentation(#10000,6," ",12)
+#20016=*
+lines(#20016,#20001,"        ","")
+#20017=@"loc,{#10000},7,1,7,8"
+locations_default(#20017,#10000,7,1,7,8)
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+numlines(#20001,3,1,0)
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+locations_default(#20020,#10000,6,18,6,18)
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+#20021=*
+tokeninfo(#20021,4,#20001,2,"""Hello, world!""")
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+locations_default(#20023,#10000,6,34,6,34)
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+#20060=*
+tokeninfo(#20060,4,#20040,4,"'Nope!'")
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+tokeninfo(#20061,8,#20040,5,")")
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+tokeninfo(#20063,8,#20040,6,")")
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+#20068=@"loc,{#10000},11,29,11,28"
+locations_default(#20068,#10000,11,29,11,28)
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+tokeninfo(#20085,0,#20070,4,"")
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+#20088=@"loc,{#10000},12,23,12,22"
+locations_default(#20088,#10000,12,23,12,22)
+hasLocation(#20087,#20088)
+#20089=*
+exit_cfg_node(#20089,#20070)
+hasLocation(#20089,#20086)
+successor(#20072,#20074)
+successor(#20076,#20073)
+successor(#20074,#20076)
+successor(#20073,#20089)
+successor(#20087,#20072)
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+locations_default(#20091,#10000,13,21,13,33)
+hasLocation(#20090,#20091)
+#20092=*
+stmts(#20092,9,#20090,0,"return false;")
+hasLocation(#20092,#20091)
+stmtContainers(#20092,#20090)
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+exprs(#20093,2,#20092,0,"false")
+#20094=@"loc,{#10000},13,28,13,32"
+locations_default(#20094,#10000,13,28,13,32)
+hasLocation(#20093,#20094)
+enclosingStmt(#20093,#20092)
+exprContainers(#20093,#20090)
+literals("false","false",#20093)
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+lines(#20095,#20090,"return false;","")
+hasLocation(#20095,#20091)
+numlines(#20090,1,1,0)
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+tokeninfo(#20096,7,#20090,0,"return")
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+#20098=*
+tokeninfo(#20098,2,#20090,1,"false")
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+#20099=*
+tokeninfo(#20099,8,#20090,2,";")
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+locations_default(#20100,#10000,13,33,13,33)
+hasLocation(#20099,#20100)
+#20101=*
+tokeninfo(#20101,0,#20090,3,"")
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+locations_default(#20102,#10000,13,34,13,33)
+hasLocation(#20101,#20102)
+#20103=*
+entry_cfg_node(#20103,#20090)
+#20104=@"loc,{#10000},13,21,13,20"
+locations_default(#20104,#10000,13,21,13,20)
+hasLocation(#20103,#20104)
+#20105=*
+exit_cfg_node(#20105,#20090)
+hasLocation(#20105,#20102)
+successor(#20093,#20092)
+successor(#20092,#20105)
+successor(#20103,#20093)
+#20106=*
+xmlElements(#20106,"html",#10000,0,#10000)
+#20107=@"loc,{#10000},1,1,18,7"
+locations_default(#20107,#10000,1,1,18,7)
+xmllocations(#20106,#20107)
+#20108=*
+xmlElements(#20108,"head",#20106,0,#10000)
+#20109=@"loc,{#10000},2,5,9,11"
+locations_default(#20109,#10000,2,5,9,11)
+xmllocations(#20108,#20109)
+#20110=*
+xmlElements(#20110,"body",#20106,1,#10000)
+#20111=@"loc,{#10000},10,5,14,11"
+locations_default(#20111,#10000,10,5,14,11)
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diff --git a/javascript/extractor/tests/html/output/trap/tst.xhtml.trap b/javascript/extractor/tests/html/output/trap/tst.xhtml.trap
new file mode 100644
index 00000000000..2ea4a130c1e
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/tst.xhtml.trap
@@ -0,0 +1,118 @@
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new file mode 100644
index 00000000000..0cd62140a70
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/tst2.html.trap
@@ -0,0 +1,362 @@
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+xmllocations(#20094,#20095)
+#20096=*
+xmlElements(#20096,"script",#20090,2,#10000)
+#20097=@"loc,{#10000},4,5,6,13"
+locations_default(#20097,#10000,4,5,6,13)
+xmllocations(#20096,#20097)
+#20098=*
+xmlElements(#20098,"script",#20090,3,#10000)
+#20099=@"loc,{#10000},7,5,9,13"
+locations_default(#20099,#10000,7,5,9,13)
+xmllocations(#20098,#20099)
+#20100=*
+xmlAttrs(#20100,#20092,"type","text/babel",0,#10000)
+#20101=@"loc,{#10000},2,13,2,29"
+locations_default(#20101,#10000,2,13,2,29)
+xmllocations(#20100,#20101)
+#20102=*
+xmlAttrs(#20102,#20094,"type","text/jsx",0,#10000)
+#20103=@"loc,{#10000},3,13,3,27"
+locations_default(#20103,#10000,3,13,3,27)
+xmllocations(#20102,#20103)
+#20104=*
+xmlAttrs(#20104,#20096,"type","text/babel",0,#10000)
+#20105=@"loc,{#10000},4,13,4,29"
+locations_default(#20105,#10000,4,13,4,29)
+xmllocations(#20104,#20105)
+#20106=*
+xmlAttrs(#20106,#20096,"data-plugins","transform-es2015-modules-umd",1,#10000)
+#20107=@"loc,{#10000},4,31,4,73"
+locations_default(#20107,#10000,4,31,4,73)
+xmllocations(#20106,#20107)
+#20108=*
+xmlAttrs(#20108,#20098,"type","text/babel",0,#10000)
+#20109=@"loc,{#10000},7,13,7,29"
+locations_default(#20109,#10000,7,13,7,29)
+xmllocations(#20108,#20109)
+#20110=*
+xmlAttrs(#20110,#20098,"data-plugins","transform-es2015-modules-umd",1,#10000)
+#20111=@"loc,{#10000},7,31,7,73"
+locations_default(#20111,#10000,7,31,7,73)
+xmllocations(#20110,#20111)
+numlines(#10000,10,4,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/html/output/trap/tst2.xhtml.trap b/javascript/extractor/tests/html/output/trap/tst2.xhtml.trap
new file mode 100644
index 00000000000..146959f935e
--- /dev/null
+++ b/javascript/extractor/tests/html/output/trap/tst2.xhtml.trap
@@ -0,0 +1,37 @@
+#10000=@"/tst2.xhtml;sourcefile"
+files(#10000,"/tst2.xhtml","tst2","xhtml",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+xmlElements(#20001,"html",#10000,0,#10000)
+#20002=@"loc,{#10000},2,1,8,7"
+locations_default(#20002,#10000,2,1,8,7)
+xmllocations(#20001,#20002)
+#20003=*
+xmlElements(#20003,"head",#20001,0,#10000)
+#20004=@"loc,{#10000},3,3,6,9"
+locations_default(#20004,#10000,3,3,6,9)
+xmllocations(#20003,#20004)
+#20005=*
+xmlElements(#20005,"body",#20001,1,#10000)
+#20006=@"loc,{#10000},7,3,7,10"
+locations_default(#20006,#10000,7,3,7,10)
+xmllocations(#20005,#20006)
+#20007=*
+xmlElements(#20007,"script",#20003,0,#10000)
+#20008=@"loc,{#10000},4,5,5,21"
+locations_default(#20008,#10000,4,5,5,21)
+xmllocations(#20007,#20008)
+#20009=*
+xmlAttrs(#20009,#20007,"src","svgunit.js",0,#10000)
+#20010=@"loc,{#10000},4,13,4,28"
+locations_default(#20010,#10000,4,13,4,28)
+xmllocations(#20009,#20010)
+numlines(#10000,8,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/jscript/input/tst.js b/javascript/extractor/tests/jscript/input/tst.js
new file mode 100644
index 00000000000..f616ecbbadb
--- /dev/null
+++ b/javascript/extractor/tests/jscript/input/tst.js
@@ -0,0 +1 @@
+function ISMTPOnArrival::OnArrival( Msg, States) { }
\ No newline at end of file
diff --git a/javascript/extractor/tests/jscript/options.json b/javascript/extractor/tests/jscript/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/jscript/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/jscript/output/trap/tst.js.trap b/javascript/extractor/tests/jscript/output/trap/tst.js.trap
new file mode 100644
index 00000000000..bd0c31aee50
--- /dev/null
+++ b/javascript/extractor/tests/jscript/output/trap/tst.js.trap
@@ -0,0 +1,181 @@
+#10000=@"/tst.js;sourcefile"
+files(#10000,"/tst.js","tst","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,52"
+locations_default(#20002,#10000,1,1,1,52)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"functio ... es) { }")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,47,#20003,0,"functio ... es) { }")
+hasLocation(#20004,#20002)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+#20005=*
+exprs(#20005,14,#20004,0,"ISMTPOn ... Arrival")
+#20006=@"loc,{#10000},1,10,1,34"
+locations_default(#20006,#10000,1,10,1,34)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,79,#20005,0,"ISMTPOnArrival")
+#20008=@"loc,{#10000},1,10,1,23"
+locations_default(#20008,#10000,1,10,1,23)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("ISMTPOnArrival","ISMTPOnArrival",#20007)
+#20009=@"var;{ISMTPOnArrival};{#20000}"
+variables(#20009,"ISMTPOnArrival",#20000)
+bind(#20007,#20009)
+#20010=*
+exprs(#20010,0,#20005,1,"OnArrival")
+#20011=@"loc,{#10000},1,26,1,34"
+locations_default(#20011,#10000,1,26,1,34)
+hasLocation(#20010,#20011)
+enclosingStmt(#20010,#20003)
+exprContainers(#20010,#20001)
+literals("OnArrival","OnArrival",#20010)
+#20012=*
+exprs(#20012,9,#20004,1,"functio ... es) { }")
+hasLocation(#20012,#20002)
+enclosingStmt(#20012,#20003)
+exprContainers(#20012,#20001)
+#20013=*
+scopes(#20013,1)
+scopenodes(#20012,#20013)
+scopenesting(#20013,#20000)
+#20014=@"var;{OnArrival};{#20013}"
+variables(#20014,"OnArrival",#20013)
+#20015=*
+exprs(#20015,78,#20012,-1,"OnArrival")
+hasLocation(#20015,#20011)
+exprContainers(#20015,#20012)
+literals("OnArrival","OnArrival",#20015)
+decl(#20015,#20014)
+#20016=@"var;{Msg};{#20013}"
+variables(#20016,"Msg",#20013)
+#20017=*
+exprs(#20017,78,#20012,0,"Msg")
+#20018=@"loc,{#10000},1,37,1,39"
+locations_default(#20018,#10000,1,37,1,39)
+hasLocation(#20017,#20018)
+exprContainers(#20017,#20012)
+literals("Msg","Msg",#20017)
+decl(#20017,#20016)
+#20019=@"var;{States};{#20013}"
+variables(#20019,"States",#20013)
+#20020=*
+exprs(#20020,78,#20012,1,"States")
+#20021=@"loc,{#10000},1,42,1,47"
+locations_default(#20021,#10000,1,42,1,47)
+hasLocation(#20020,#20021)
+exprContainers(#20020,#20012)
+literals("States","States",#20020)
+decl(#20020,#20019)
+#20022=@"var;{arguments};{#20013}"
+variables(#20022,"arguments",#20013)
+isArgumentsObject(#20022)
+#20023=*
+stmts(#20023,1,#20012,-2,"{ }")
+#20024=@"loc,{#10000},1,50,1,52"
+locations_default(#20024,#10000,1,50,1,52)
+hasLocation(#20023,#20024)
+stmtContainers(#20023,#20012)
+numlines(#20012,1,1,0)
+#20025=*
+lines(#20025,#20001,"function ISMTPOnArrival::OnArrival( Msg, States) { }","")
+hasLocation(#20025,#20002)
+numlines(#20001,1,1,0)
+#20026=*
+tokeninfo(#20026,7,#20001,0,"function")
+#20027=@"loc,{#10000},1,1,1,8"
+locations_default(#20027,#10000,1,1,1,8)
+hasLocation(#20026,#20027)
+#20028=*
+tokeninfo(#20028,6,#20001,1,"ISMTPOnArrival")
+hasLocation(#20028,#20008)
+#20029=*
+tokeninfo(#20029,8,#20001,2,"::")
+#20030=@"loc,{#10000},1,24,1,25"
+locations_default(#20030,#10000,1,24,1,25)
+hasLocation(#20029,#20030)
+#20031=*
+tokeninfo(#20031,6,#20001,3,"OnArrival")
+hasLocation(#20031,#20011)
+#20032=*
+tokeninfo(#20032,8,#20001,4,"(")
+#20033=@"loc,{#10000},1,35,1,35"
+locations_default(#20033,#10000,1,35,1,35)
+hasLocation(#20032,#20033)
+#20034=*
+tokeninfo(#20034,6,#20001,5,"Msg")
+hasLocation(#20034,#20018)
+#20035=*
+tokeninfo(#20035,8,#20001,6,",")
+#20036=@"loc,{#10000},1,40,1,40"
+locations_default(#20036,#10000,1,40,1,40)
+hasLocation(#20035,#20036)
+#20037=*
+tokeninfo(#20037,6,#20001,7,"States")
+hasLocation(#20037,#20021)
+#20038=*
+tokeninfo(#20038,8,#20001,8,")")
+#20039=@"loc,{#10000},1,48,1,48"
+locations_default(#20039,#10000,1,48,1,48)
+hasLocation(#20038,#20039)
+#20040=*
+tokeninfo(#20040,8,#20001,9,"{")
+#20041=@"loc,{#10000},1,50,1,50"
+locations_default(#20041,#10000,1,50,1,50)
+hasLocation(#20040,#20041)
+#20042=*
+tokeninfo(#20042,8,#20001,10,"}")
+#20043=@"loc,{#10000},1,52,1,52"
+locations_default(#20043,#10000,1,52,1,52)
+hasLocation(#20042,#20043)
+#20044=*
+tokeninfo(#20044,0,#20001,11,"")
+#20045=@"loc,{#10000},1,53,1,52"
+locations_default(#20045,#10000,1,53,1,52)
+hasLocation(#20044,#20045)
+#20046=*
+entry_cfg_node(#20046,#20001)
+#20047=@"loc,{#10000},1,1,1,0"
+locations_default(#20047,#10000,1,1,1,0)
+hasLocation(#20046,#20047)
+#20048=*
+exit_cfg_node(#20048,#20001)
+hasLocation(#20048,#20045)
+successor(#20003,#20007)
+successor(#20012,#20004)
+#20049=*
+entry_cfg_node(#20049,#20012)
+hasLocation(#20049,#20047)
+#20050=*
+exit_cfg_node(#20050,#20012)
+hasLocation(#20050,#20045)
+successor(#20023,#20050)
+successor(#20020,#20023)
+successor(#20017,#20020)
+successor(#20015,#20017)
+successor(#20049,#20015)
+successor(#20010,#20005)
+successor(#20007,#20010)
+successor(#20005,#20012)
+successor(#20004,#20048)
+successor(#20046,#20003)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/json/input/array.json b/javascript/extractor/tests/json/input/array.json
new file mode 100644
index 00000000000..fe51488c706
--- /dev/null
+++ b/javascript/extractor/tests/json/input/array.json
@@ -0,0 +1 @@
+[]
diff --git a/javascript/extractor/tests/json/input/comments.json b/javascript/extractor/tests/json/input/comments.json
new file mode 100644
index 00000000000..bdc2822bed3
--- /dev/null
+++ b/javascript/extractor/tests/json/input/comments.json
@@ -0,0 +1,5 @@
+{
+  // comments aren't legal JSON
+  "hello": "world"
+  /* no, not even block comments */
+}
diff --git a/javascript/extractor/tests/json/input/duplicate-keys.json b/javascript/extractor/tests/json/input/duplicate-keys.json
new file mode 100644
index 00000000000..da94b48fb18
--- /dev/null
+++ b/javascript/extractor/tests/json/input/duplicate-keys.json
@@ -0,0 +1,4 @@
+{
+    "x": 23,
+    "x": 42
+}
diff --git a/javascript/extractor/tests/json/input/empty.json b/javascript/extractor/tests/json/input/empty.json
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/javascript/extractor/tests/json/input/error.json b/javascript/extractor/tests/json/input/error.json
new file mode 100644
index 00000000000..81750b96f9d
--- /dev/null
+++ b/javascript/extractor/tests/json/input/error.json
@@ -0,0 +1 @@
+{
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/f/ignored.json b/javascript/extractor/tests/json/input/f/ignored.json
new file mode 100644
index 00000000000..9e26dfeeb6e
--- /dev/null
+++ b/javascript/extractor/tests/json/input/f/ignored.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/invalid.json b/javascript/extractor/tests/json/input/invalid.json
new file mode 100644
index 00000000000..bf2cbc86091
--- /dev/null
+++ b/javascript/extractor/tests/json/input/invalid.json
@@ -0,0 +1,3 @@
+{
+    x: 23
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/neg.json b/javascript/extractor/tests/json/input/neg.json
new file mode 100644
index 00000000000..d7d17fcbef9
--- /dev/null
+++ b/javascript/extractor/tests/json/input/neg.json
@@ -0,0 +1 @@
+-1
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/neg2.json b/javascript/extractor/tests/json/input/neg2.json
new file mode 100644
index 00000000000..9a11babd84d
--- /dev/null
+++ b/javascript/extractor/tests/json/input/neg2.json
@@ -0,0 +1 @@
+[1, -2]
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/null.json b/javascript/extractor/tests/json/input/null.json
new file mode 100644
index 00000000000..ec747fa47dd
--- /dev/null
+++ b/javascript/extractor/tests/json/input/null.json
@@ -0,0 +1 @@
+null
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/omitted.json b/javascript/extractor/tests/json/input/omitted.json
new file mode 100644
index 00000000000..3c217190c7c
--- /dev/null
+++ b/javascript/extractor/tests/json/input/omitted.json
@@ -0,0 +1,3 @@
+{
+    "x": [ , 23 ]
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/input/tst.json b/javascript/extractor/tests/json/input/tst.json
new file mode 100644
index 00000000000..f0fd30be204
--- /dev/null
+++ b/javascript/extractor/tests/json/input/tst.json
@@ -0,0 +1,7 @@
+{
+    "hello": "world",
+    "o": {
+        "x": 23,
+        "y": 42
+    }
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/json/output/trap/array.json.trap b/javascript/extractor/tests/json/output/trap/array.json.trap
new file mode 100644
index 00000000000..96a00626519
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/array.json.trap
@@ -0,0 +1,15 @@
+#10000=@"/array.json;sourcefile"
+files(#10000,"/array.json","array","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,4,#10000,0,"[]")
+#20001=@"loc,{#10000},1,1,1,2"
+locations_default(#20001,#10000,1,1,1,2)
+hasLocation(#20000,#20001)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/comments.json.trap b/javascript/extractor/tests/json/output/trap/comments.json.trap
new file mode 100644
index 00000000000..3e18082880b
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/comments.json.trap
@@ -0,0 +1,32 @@
+#10000=@"/comments.json;sourcefile"
+files(#10000,"/comments.json","comments","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,5,#10000,0,"{\n  //  ... ts */\n}")
+#20001=@"loc,{#10000},1,1,5,1"
+locations_default(#20001,#10000,1,1,5,1)
+hasLocation(#20000,#20001)
+#20002=*
+json(#20002,3,#20000,0,"""world""")
+#20003=@"loc,{#10000},3,12,3,18"
+locations_default(#20003,#10000,3,12,3,18)
+hasLocation(#20002,#20003)
+json_literals("world","""world""",#20002)
+json_properties(#20000,"hello",#20002)
+#20004=*
+json_errors(#20004,"Error: Comments are not legal in JSON.")
+#20005=@"loc,{#10000},2,3,2,3"
+locations_default(#20005,#10000,2,3,2,3)
+hasLocation(#20004,#20005)
+#20006=*
+json_errors(#20006,"Error: Comments are not legal in JSON.")
+#20007=@"loc,{#10000},4,3,4,3"
+locations_default(#20007,#10000,4,3,4,3)
+hasLocation(#20006,#20007)
+numlines(#10000,5,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/duplicate-keys.json.trap b/javascript/extractor/tests/json/output/trap/duplicate-keys.json.trap
new file mode 100644
index 00000000000..ebc28d147bf
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/duplicate-keys.json.trap
@@ -0,0 +1,29 @@
+#10000=@"/duplicate-keys.json;sourcefile"
+files(#10000,"/duplicate-keys.json","duplicate-keys","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,5,#10000,0,"{\n    "" ... "": 42\n}")
+#20001=@"loc,{#10000},1,1,4,1"
+locations_default(#20001,#10000,1,1,4,1)
+hasLocation(#20000,#20001)
+#20002=*
+json(#20002,2,#20000,0,"23")
+#20003=@"loc,{#10000},2,10,2,11"
+locations_default(#20003,#10000,2,10,2,11)
+hasLocation(#20002,#20003)
+json_literals("23","23",#20002)
+json_properties(#20000,"x",#20002)
+#20004=*
+json(#20004,2,#20000,1,"42")
+#20005=@"loc,{#10000},3,10,3,11"
+locations_default(#20005,#10000,3,10,3,11)
+hasLocation(#20004,#20005)
+json_literals("42","42",#20004)
+json_properties(#20000,"x",#20004)
+numlines(#10000,4,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/empty.json.trap b/javascript/extractor/tests/json/output/trap/empty.json.trap
new file mode 100644
index 00000000000..e8a3aa4d813
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/empty.json.trap
@@ -0,0 +1,15 @@
+#10000=@"/empty.json;sourcefile"
+files(#10000,"/empty.json","empty","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json_errors(#20000,"Error: Unexpected token")
+#20001=@"loc,{#10000},1,1,1,1"
+locations_default(#20001,#10000,1,1,1,1)
+hasLocation(#20000,#20001)
+numlines(#10000,0,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/error.json.trap b/javascript/extractor/tests/json/output/trap/error.json.trap
new file mode 100644
index 00000000000..dd2dc094850
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/error.json.trap
@@ -0,0 +1,15 @@
+#10000=@"/error.json;sourcefile"
+files(#10000,"/error.json","error","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json_errors(#20000,"Error: Unexpected token")
+#20001=@"loc,{#10000},1,2,1,2"
+locations_default(#20001,#10000,1,2,1,2)
+hasLocation(#20000,#20001)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/invalid.json.trap b/javascript/extractor/tests/json/output/trap/invalid.json.trap
new file mode 100644
index 00000000000..d607af95198
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/invalid.json.trap
@@ -0,0 +1,15 @@
+#10000=@"/invalid.json;sourcefile"
+files(#10000,"/invalid.json","invalid","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json_errors(#20000,"Error: JSON object property keys must be string literals.")
+#20001=@"loc,{#10000},2,5,2,5"
+locations_default(#20001,#10000,2,5,2,5)
+hasLocation(#20000,#20001)
+numlines(#10000,3,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/neg.json.trap b/javascript/extractor/tests/json/output/trap/neg.json.trap
new file mode 100644
index 00000000000..fb584fbb0cf
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/neg.json.trap
@@ -0,0 +1,16 @@
+#10000=@"/neg.json;sourcefile"
+files(#10000,"/neg.json","neg","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,2,#10000,0,"-1")
+#20001=@"loc,{#10000},1,1,1,2"
+locations_default(#20001,#10000,1,1,1,2)
+hasLocation(#20000,#20001)
+json_literals("-1","-1",#20000)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/neg2.json.trap b/javascript/extractor/tests/json/output/trap/neg2.json.trap
new file mode 100644
index 00000000000..50031abfc20
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/neg2.json.trap
@@ -0,0 +1,27 @@
+#10000=@"/neg2.json;sourcefile"
+files(#10000,"/neg2.json","neg2","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,4,#10000,0,"[1, -2]")
+#20001=@"loc,{#10000},1,1,1,7"
+locations_default(#20001,#10000,1,1,1,7)
+hasLocation(#20000,#20001)
+#20002=*
+json(#20002,2,#20000,0,"1")
+#20003=@"loc,{#10000},1,2,1,2"
+locations_default(#20003,#10000,1,2,1,2)
+hasLocation(#20002,#20003)
+json_literals("1","1",#20002)
+#20004=*
+json(#20004,2,#20000,1,"-2")
+#20005=@"loc,{#10000},1,5,1,6"
+locations_default(#20005,#10000,1,5,1,6)
+hasLocation(#20004,#20005)
+json_literals("-2","-2",#20004)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/null.json.trap b/javascript/extractor/tests/json/output/trap/null.json.trap
new file mode 100644
index 00000000000..f8c076aff39
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/null.json.trap
@@ -0,0 +1,16 @@
+#10000=@"/null.json;sourcefile"
+files(#10000,"/null.json","null","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,0,#10000,0,"null")
+#20001=@"loc,{#10000},1,1,1,4"
+locations_default(#20001,#10000,1,1,1,4)
+hasLocation(#20000,#20001)
+json_literals("null","null",#20000)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/omitted.json.trap b/javascript/extractor/tests/json/output/trap/omitted.json.trap
new file mode 100644
index 00000000000..581d3f2f103
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/omitted.json.trap
@@ -0,0 +1,15 @@
+#10000=@"/omitted.json;sourcefile"
+files(#10000,"/omitted.json","omitted","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json_errors(#20000,"Error: Omitted elements are not allowed in JSON.")
+#20001=@"loc,{#10000},2,12,2,12"
+locations_default(#20001,#10000,2,12,2,12)
+hasLocation(#20000,#20001)
+numlines(#10000,3,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/json/output/trap/tst.json.trap b/javascript/extractor/tests/json/output/trap/tst.json.trap
new file mode 100644
index 00000000000..35ea0d83975
--- /dev/null
+++ b/javascript/extractor/tests/json/output/trap/tst.json.trap
@@ -0,0 +1,42 @@
+#10000=@"/tst.json;sourcefile"
+files(#10000,"/tst.json","tst","json",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+json(#20000,5,#10000,0,"{\n    "" ...     }\n}")
+#20001=@"loc,{#10000},1,1,7,1"
+locations_default(#20001,#10000,1,1,7,1)
+hasLocation(#20000,#20001)
+#20002=*
+json(#20002,3,#20000,0,"""world""")
+#20003=@"loc,{#10000},2,14,2,20"
+locations_default(#20003,#10000,2,14,2,20)
+hasLocation(#20002,#20003)
+json_literals("world","""world""",#20002)
+json_properties(#20000,"hello",#20002)
+#20004=*
+json(#20004,5,#20000,1,"{\n      ... 2\n    }")
+#20005=@"loc,{#10000},3,10,6,5"
+locations_default(#20005,#10000,3,10,6,5)
+hasLocation(#20004,#20005)
+#20006=*
+json(#20006,2,#20004,0,"23")
+#20007=@"loc,{#10000},4,14,4,15"
+locations_default(#20007,#10000,4,14,4,15)
+hasLocation(#20006,#20007)
+json_literals("23","23",#20006)
+json_properties(#20004,"x",#20006)
+#20008=*
+json(#20008,2,#20004,1,"42")
+#20009=@"loc,{#10000},5,14,5,15"
+locations_default(#20009,#10000,5,14,5,15)
+hasLocation(#20008,#20009)
+json_literals("42","42",#20008)
+json_properties(#20004,"y",#20008)
+json_properties(#20000,"o",#20004)
+numlines(#10000,7,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/jsx/input/err1.jsx b/javascript/extractor/tests/jsx/input/err1.jsx
new file mode 100644
index 00000000000..8aa93574714
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/err1.jsx
@@ -0,0 +1 @@
+</>
diff --git a/javascript/extractor/tests/jsx/input/err2.jsx b/javascript/extractor/tests/jsx/input/err2.jsx
new file mode 100644
index 00000000000..b554d9e46a8
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/err2.jsx
@@ -0,0 +1 @@
+<>
diff --git a/javascript/extractor/tests/jsx/input/err3.jsx b/javascript/extractor/tests/jsx/input/err3.jsx
new file mode 100644
index 00000000000..5d1ad4afe52
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/err3.jsx
@@ -0,0 +1 @@
+<a></>
diff --git a/javascript/extractor/tests/jsx/input/err4.jsx b/javascript/extractor/tests/jsx/input/err4.jsx
new file mode 100644
index 00000000000..152e0e84016
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/err4.jsx
@@ -0,0 +1 @@
+<></a>
diff --git a/javascript/extractor/tests/jsx/input/tst.js b/javascript/extractor/tests/jsx/input/tst.js
new file mode 100644
index 00000000000..75b0733c966
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/tst.js
@@ -0,0 +1,5 @@
+<a/>;
+<b:c d:e/>;
+<f g:h="b&amp;r" i={"a"+"b"}>{j}<k.l><M/></k.l></f>;
+<n {...props}/>;
+<><a/><b/></>
diff --git a/javascript/extractor/tests/jsx/input/tst.jsx b/javascript/extractor/tests/jsx/input/tst.jsx
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/javascript/extractor/tests/jsx/input/tst2.js b/javascript/extractor/tests/jsx/input/tst2.js
new file mode 100644
index 00000000000..bb807216237
--- /dev/null
+++ b/javascript/extractor/tests/jsx/input/tst2.js
@@ -0,0 +1 @@
+<a>/b&gt;</a>
\ No newline at end of file
diff --git a/javascript/extractor/tests/jsx/output/trap/err1.jsx.trap b/javascript/extractor/tests/jsx/output/trap/err1.jsx.trap
new file mode 100644
index 00000000000..c19eb4b515f
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/err1.jsx.trap
@@ -0,0 +1,30 @@
+#10000=@"/err1.jsx;sourcefile"
+files(#10000,"/err1.jsx","err1","jsx",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unexpected token","</>
+")
+#20004=@"loc,{#10000},1,2,1,2"
+locations_default(#20004,#10000,1,2,1,2)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"</>","
+")
+#20006=@"loc,{#10000},1,1,1,3"
+locations_default(#20006,#10000,1,1,1,3)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/err2.jsx.trap b/javascript/extractor/tests/jsx/output/trap/err2.jsx.trap
new file mode 100644
index 00000000000..6cd6cf49bc0
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/err2.jsx.trap
@@ -0,0 +1,30 @@
+#10000=@"/err2.jsx;sourcefile"
+files(#10000,"/err2.jsx","err2","jsx",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unterminated JSX contents","<>
+")
+#20004=@"loc,{#10000},1,3,1,3"
+locations_default(#20004,#10000,1,3,1,3)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"<>","
+")
+#20006=@"loc,{#10000},1,1,1,2"
+locations_default(#20006,#10000,1,1,1,2)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/err3.jsx.trap b/javascript/extractor/tests/jsx/output/trap/err3.jsx.trap
new file mode 100644
index 00000000000..2450d3776dc
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/err3.jsx.trap
@@ -0,0 +1,30 @@
+#10000=@"/err3.jsx;sourcefile"
+files(#10000,"/err3.jsx","err3","jsx",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Expected corresponding JSX closing tag for <a>","<a></>
+")
+#20004=@"loc,{#10000},1,4,1,4"
+locations_default(#20004,#10000,1,4,1,4)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"<a></>","
+")
+#20006=@"loc,{#10000},1,1,1,6"
+locations_default(#20006,#10000,1,1,1,6)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/err4.jsx.trap b/javascript/extractor/tests/jsx/output/trap/err4.jsx.trap
new file mode 100644
index 00000000000..22f018c4498
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/err4.jsx.trap
@@ -0,0 +1,30 @@
+#10000=@"/err4.jsx;sourcefile"
+files(#10000,"/err4.jsx","err4","jsx",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,1"
+locations_default(#20002,#10000,1,1,1,1)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Expected corresponding JSX closing tag for <>","<></a>
+")
+#20004=@"loc,{#10000},1,3,1,3"
+locations_default(#20004,#10000,1,3,1,3)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"<></a>","
+")
+#20006=@"loc,{#10000},1,1,1,6"
+locations_default(#20006,#10000,1,1,1,6)
+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/tst.js.trap b/javascript/extractor/tests/jsx/output/trap/tst.js.trap
new file mode 100644
index 00000000000..e86d9e16be5
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/tst.js.trap
@@ -0,0 +1,752 @@
+#10000=@"/tst.js;sourcefile"
+files(#10000,"/tst.js","tst","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,6,0"
+locations_default(#20002,#10000,1,1,6,0)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"<a/>;")
+#20004=@"loc,{#10000},1,1,1,5"
+locations_default(#20004,#10000,1,1,1,5)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,89,#20003,0,"<a/>")
+#20006=@"loc,{#10000},1,1,1,4"
+locations_default(#20006,#10000,1,1,1,4)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,0,#20005,-1,"a")
+#20008=@"loc,{#10000},1,2,1,2"
+locations_default(#20008,#10000,1,2,1,2)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("a","a",#20007)
+#20009=*
+stmts(#20009,2,#20001,1,"<b:c d:e/>;")
+#20010=@"loc,{#10000},2,1,2,11"
+locations_default(#20010,#10000,2,1,2,11)
+hasLocation(#20009,#20010)
+stmtContainers(#20009,#20001)
+#20011=*
+exprs(#20011,89,#20009,0,"<b:c d:e/>")
+#20012=@"loc,{#10000},2,1,2,10"
+locations_default(#20012,#10000,2,1,2,10)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20009)
+exprContainers(#20011,#20001)
+#20013=*
+exprs(#20013,90,#20011,-1,"b:c")
+#20014=@"loc,{#10000},2,2,2,4"
+locations_default(#20014,#10000,2,2,2,4)
+hasLocation(#20013,#20014)
+enclosingStmt(#20013,#20009)
+exprContainers(#20013,#20001)
+#20015=*
+exprs(#20015,0,#20013,0,"b")
+#20016=@"loc,{#10000},2,2,2,2"
+locations_default(#20016,#10000,2,2,2,2)
+hasLocation(#20015,#20016)
+enclosingStmt(#20015,#20009)
+exprContainers(#20015,#20001)
+literals("b","b",#20015)
+#20017=*
+exprs(#20017,0,#20013,1,"c")
+#20018=@"loc,{#10000},2,4,2,4"
+locations_default(#20018,#10000,2,4,2,4)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20009)
+exprContainers(#20017,#20001)
+literals("c","c",#20017)
+#20019=*
+properties(#20019,#20011,0,3,"d:e")
+#20020=@"loc,{#10000},2,6,2,8"
+locations_default(#20020,#10000,2,6,2,8)
+hasLocation(#20019,#20020)
+#20021=*
+exprs(#20021,90,#20019,0,"d:e")
+hasLocation(#20021,#20020)
+enclosingStmt(#20021,#20009)
+exprContainers(#20021,#20001)
+#20022=*
+exprs(#20022,0,#20021,0,"d")
+#20023=@"loc,{#10000},2,6,2,6"
+locations_default(#20023,#10000,2,6,2,6)
+hasLocation(#20022,#20023)
+enclosingStmt(#20022,#20009)
+exprContainers(#20022,#20001)
+literals("d","d",#20022)
+#20024=*
+exprs(#20024,0,#20021,1,"e")
+#20025=@"loc,{#10000},2,8,2,8"
+locations_default(#20025,#10000,2,8,2,8)
+hasLocation(#20024,#20025)
+enclosingStmt(#20024,#20009)
+exprContainers(#20024,#20001)
+literals("e","e",#20024)
+#20026=*
+stmts(#20026,2,#20001,2,"<f g:h= ... l></f>;")
+#20027=@"loc,{#10000},3,1,3,52"
+locations_default(#20027,#10000,3,1,3,52)
+hasLocation(#20026,#20027)
+stmtContainers(#20026,#20001)
+#20028=*
+exprs(#20028,89,#20026,0,"<f g:h= ... .l></f>")
+#20029=@"loc,{#10000},3,1,3,51"
+locations_default(#20029,#10000,3,1,3,51)
+hasLocation(#20028,#20029)
+enclosingStmt(#20028,#20026)
+exprContainers(#20028,#20001)
+#20030=*
+exprs(#20030,0,#20028,-1,"f")
+#20031=@"loc,{#10000},3,2,3,2"
+locations_default(#20031,#10000,3,2,3,2)
+hasLocation(#20030,#20031)
+enclosingStmt(#20030,#20026)
+exprContainers(#20030,#20001)
+literals("f","f",#20030)
+#20032=*
+properties(#20032,#20028,0,3,"g:h=""b&amp;r""")
+#20033=@"loc,{#10000},3,4,3,16"
+locations_default(#20033,#10000,3,4,3,16)
+hasLocation(#20032,#20033)
+#20034=*
+exprs(#20034,90,#20032,0,"g:h")
+#20035=@"loc,{#10000},3,4,3,6"
+locations_default(#20035,#10000,3,4,3,6)
+hasLocation(#20034,#20035)
+enclosingStmt(#20034,#20026)
+exprContainers(#20034,#20001)
+#20036=*
+exprs(#20036,0,#20034,0,"g")
+#20037=@"loc,{#10000},3,4,3,4"
+locations_default(#20037,#10000,3,4,3,4)
+hasLocation(#20036,#20037)
+enclosingStmt(#20036,#20026)
+exprContainers(#20036,#20001)
+literals("g","g",#20036)
+#20038=*
+exprs(#20038,0,#20034,1,"h")
+#20039=@"loc,{#10000},3,6,3,6"
+locations_default(#20039,#10000,3,6,3,6)
+hasLocation(#20038,#20039)
+enclosingStmt(#20038,#20026)
+exprContainers(#20038,#20001)
+literals("h","h",#20038)
+#20040=*
+exprs(#20040,4,#20032,1,"""b&amp;r""")
+#20041=@"loc,{#10000},3,8,3,16"
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+#20226=@"loc,{#10000},5,13,5,13"
+locations_default(#20226,#10000,5,13,5,13)
+hasLocation(#20225,#20226)
+#20227=*
+tokeninfo(#20227,0,#20001,75,"")
+#20228=@"loc,{#10000},6,1,6,0"
+locations_default(#20228,#10000,6,1,6,0)
+hasLocation(#20227,#20228)
+#20229=*
+entry_cfg_node(#20229,#20001)
+#20230=@"loc,{#10000},1,1,1,0"
+locations_default(#20230,#10000,1,1,1,0)
+hasLocation(#20229,#20230)
+#20231=*
+exit_cfg_node(#20231,#20001)
+hasLocation(#20231,#20228)
+successor(#20081,#20086)
+successor(#20090,#20088)
+successor(#20088,#20083)
+successor(#20086,#20084)
+successor(#20084,#20090)
+successor(#20083,#20231)
+successor(#20069,#20073)
+successor(#20078,#20077)
+successor(#20077,#20075)
+successor(#20075,#20071)
+successor(#20073,#20078)
+successor(#20071,#20081)
+successor(#20026,#20030)
+successor(#20066,#20064)
+successor(#20064,#20055)
+successor(#20062,#20057)
+successor(#20059,#20062)
+successor(#20057,#20066)
+successor(#20055,#20028)
+successor(#20052,#20059)
+successor(#20050,#20046)
+successor(#20048,#20050)
+successor(#20046,#20042)
+successor(#20044,#20048)
+successor(#20042,#20052)
+successor(#20040,#20032)
+successor(#20038,#20034)
+successor(#20036,#20038)
+successor(#20034,#20040)
+successor(#20032,#20044)
+successor(#20030,#20036)
+successor(#20028,#20069)
+successor(#20009,#20015)
+successor(#20024,#20021)
+successor(#20022,#20024)
+successor(#20021,#20019)
+successor(#20019,#20011)
+successor(#20017,#20013)
+successor(#20015,#20017)
+successor(#20013,#20022)
+successor(#20011,#20026)
+successor(#20003,#20007)
+successor(#20007,#20005)
+successor(#20005,#20009)
+successor(#20229,#20003)
+numlines(#10000,5,5,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/tst.jsx.trap b/javascript/extractor/tests/jsx/output/trap/tst.jsx.trap
new file mode 100644
index 00000000000..f32e397621f
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/tst.jsx.trap
@@ -0,0 +1,28 @@
+#10000=@"/tst.jsx;sourcefile"
+files(#10000,"/tst.jsx","tst","jsx",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,0"
+locations_default(#20002,#10000,1,1,1,0)
+hasLocation(#20001,#20002)
+numlines(#20001,0,0,0)
+#20003=*
+tokeninfo(#20003,0,#20001,0,"")
+hasLocation(#20003,#20002)
+#20004=*
+entry_cfg_node(#20004,#20001)
+hasLocation(#20004,#20002)
+#20005=*
+exit_cfg_node(#20005,#20001)
+hasLocation(#20005,#20002)
+successor(#20004,#20005)
+numlines(#10000,0,0,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/jsx/output/trap/tst2.js.trap b/javascript/extractor/tests/jsx/output/trap/tst2.js.trap
new file mode 100644
index 00000000000..341d3d1e796
--- /dev/null
+++ b/javascript/extractor/tests/jsx/output/trap/tst2.js.trap
@@ -0,0 +1,100 @@
+#10000=@"/tst2.js;sourcefile"
+files(#10000,"/tst2.js","tst2","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,1,13"
+locations_default(#20002,#10000,1,1,1,13)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"<a>/b&gt;</a>")
+hasLocation(#20003,#20002)
+stmtContainers(#20003,#20001)
+#20004=*
+exprs(#20004,89,#20003,0,"<a>/b&gt;</a>")
+hasLocation(#20004,#20002)
+enclosingStmt(#20004,#20003)
+exprContainers(#20004,#20001)
+#20005=*
+exprs(#20005,0,#20004,-1,"a")
+#20006=@"loc,{#10000},1,2,1,2"
+locations_default(#20006,#10000,1,2,1,2)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+literals("a","a",#20005)
+#20007=*
+exprs(#20007,4,#20004,-2,"/b&gt;")
+#20008=@"loc,{#10000},1,4,1,9"
+locations_default(#20008,#10000,1,4,1,9)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("/b>","/b&gt;",#20007)
+#20009=*
+lines(#20009,#20001,"<a>/b&gt;</a>","")
+hasLocation(#20009,#20002)
+numlines(#20001,1,1,0)
+#20010=*
+tokeninfo(#20010,8,#20001,0,"<")
+#20011=@"loc,{#10000},1,1,1,1"
+locations_default(#20011,#10000,1,1,1,1)
+hasLocation(#20010,#20011)
+#20012=*
+tokeninfo(#20012,6,#20001,1,"a")
+hasLocation(#20012,#20006)
+#20013=*
+tokeninfo(#20013,8,#20001,2,">")
+#20014=@"loc,{#10000},1,3,1,3"
+locations_default(#20014,#10000,1,3,1,3)
+hasLocation(#20013,#20014)
+#20015=*
+tokeninfo(#20015,4,#20001,3,"/b&gt;")
+hasLocation(#20015,#20008)
+#20016=*
+tokeninfo(#20016,8,#20001,4,"<")
+#20017=@"loc,{#10000},1,10,1,10"
+locations_default(#20017,#10000,1,10,1,10)
+hasLocation(#20016,#20017)
+#20018=*
+tokeninfo(#20018,8,#20001,5,"/")
+#20019=@"loc,{#10000},1,11,1,11"
+locations_default(#20019,#10000,1,11,1,11)
+hasLocation(#20018,#20019)
+#20020=*
+tokeninfo(#20020,6,#20001,6,"a")
+#20021=@"loc,{#10000},1,12,1,12"
+locations_default(#20021,#10000,1,12,1,12)
+hasLocation(#20020,#20021)
+#20022=*
+tokeninfo(#20022,8,#20001,7,">")
+#20023=@"loc,{#10000},1,13,1,13"
+locations_default(#20023,#10000,1,13,1,13)
+hasLocation(#20022,#20023)
+#20024=*
+tokeninfo(#20024,0,#20001,8,"")
+#20025=@"loc,{#10000},1,14,1,13"
+locations_default(#20025,#10000,1,14,1,13)
+hasLocation(#20024,#20025)
+#20026=*
+entry_cfg_node(#20026,#20001)
+#20027=@"loc,{#10000},1,1,1,0"
+locations_default(#20027,#10000,1,1,1,0)
+hasLocation(#20026,#20027)
+#20028=*
+exit_cfg_node(#20028,#20001)
+hasLocation(#20028,#20025)
+successor(#20003,#20005)
+successor(#20007,#20004)
+successor(#20005,#20007)
+successor(#20004,#20028)
+successor(#20026,#20003)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/mozilla/input/array_comprehensions.js b/javascript/extractor/tests/mozilla/input/array_comprehensions.js
new file mode 100644
index 00000000000..6c7fd16a6fc
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/array_comprehensions.js
@@ -0,0 +1,4 @@
+[for (year of years) if (year > 2000) year];
+year;
+[for (i of numbers) for (j of letters) i+j];
+[for (i of numbers) for (j of letters) if (i<j) i+j];
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/foreach.js b/javascript/extractor/tests/mozilla/input/foreach.js
new file mode 100644
index 00000000000..1df30053437
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/foreach.js
@@ -0,0 +1,8 @@
+var sum = 0;
+var obj = {prop1: 5, prop2: 13, prop3: 8};
+
+for each (var item in obj) {
+  sum += item;
+}
+
+console.log(sum); // logs "26", which is 5+13+8
diff --git a/javascript/extractor/tests/mozilla/input/generator_expressions.js b/javascript/extractor/tests/mozilla/input/generator_expressions.js
new file mode 100644
index 00000000000..18a7d69ab8a
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/generator_expressions.js
@@ -0,0 +1,4 @@
+(for (year of years) if (year > 2000) year);
+year;
+(for (i of numbers) for (j of letters) i+j);
+(for (i of numbers) for (j of letters) if (i<j) i+j);
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/guardedCatch.js b/javascript/extractor/tests/mozilla/input/guardedCatch.js
new file mode 100644
index 00000000000..7dc271c948c
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/guardedCatch.js
@@ -0,0 +1,9 @@
+function f(g) {
+	try {
+		g();
+	} catch (e if e instanceof Error) {
+		console.log("error!");
+	} catch (e) {
+		console.log("something else!");
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/letExpr.js b/javascript/extractor/tests/mozilla/input/letExpr.js
new file mode 100644
index 00000000000..f56b7623a08
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/letExpr.js
@@ -0,0 +1,5 @@
+var x = 42, y = 19;
+
+console.log(let (x = 23, y = 19) x + y);
+
+console.log(x - y);
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/letStmt.js b/javascript/extractor/tests/mozilla/input/letStmt.js
new file mode 100644
index 00000000000..fe5fe1eacdf
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/letStmt.js
@@ -0,0 +1,7 @@
+var x = 42, y = 19;
+
+let (x = 23, y = 19) {
+  console.log(x + y);
+}
+
+console.log(x - y);
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/letStmt2.js b/javascript/extractor/tests/mozilla/input/letStmt2.js
new file mode 100644
index 00000000000..e02438d1520
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/letStmt2.js
@@ -0,0 +1 @@
+let (x = 0) 1
diff --git a/javascript/extractor/tests/mozilla/input/new-with-trailing-arg.js b/javascript/extractor/tests/mozilla/input/new-with-trailing-arg.js
new file mode 100644
index 00000000000..4210e8d6885
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/new-with-trailing-arg.js
@@ -0,0 +1,6 @@
+// `new` with initializer
+new A() { foo: "bar" }
+
+// `new` followed by an empty block
+new A()
+{}
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/input/odasa-2593.js b/javascript/extractor/tests/mozilla/input/odasa-2593.js
new file mode 100644
index 00000000000..88bbe024907
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/input/odasa-2593.js
@@ -0,0 +1,4 @@
+function test() {
+    arguments;
+    let (arguments);
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/mozilla/options.json b/javascript/extractor/tests/mozilla/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/mozilla/output/trap/array_comprehensions.js.trap b/javascript/extractor/tests/mozilla/output/trap/array_comprehensions.js.trap
new file mode 100644
index 00000000000..73b8100409b
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/output/trap/array_comprehensions.js.trap
@@ -0,0 +1,701 @@
+#10000=@"/array_comprehensions.js;sourcefile"
+files(#10000,"/array_comprehensions.js","array_comprehensions","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,4,53"
+locations_default(#20002,#10000,1,1,4,53)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"[for (y ...  year];")
+#20004=@"loc,{#10000},1,1,1,44"
+locations_default(#20004,#10000,1,1,1,44)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,73,#20003,0,"[for (y ... ) year]")
+#20006=@"loc,{#10000},1,1,1,43"
+locations_default(#20006,#10000,1,1,1,43)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,76,#20005,1,"for (year of years)")
+#20008=@"loc,{#10000},1,2,1,20"
+locations_default(#20008,#10000,1,2,1,20)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+#20009=*
+scopes(#20009,7)
+scopenodes(#20007,#20009)
+scopenesting(#20009,#20000)
+#20010=@"var;{year};{#20009}"
+variables(#20010,"year",#20009)
+#20011=*
+exprs(#20011,78,#20007,0,"year")
+#20012=@"loc,{#10000},1,7,1,10"
+locations_default(#20012,#10000,1,7,1,10)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20003)
+exprContainers(#20011,#20001)
+literals("year","year",#20011)
+decl(#20011,#20010)
+#20013=*
+exprs(#20013,79,#20007,1,"years")
+#20014=@"loc,{#10000},1,15,1,19"
+locations_default(#20014,#10000,1,15,1,19)
+hasLocation(#20013,#20014)
+enclosingStmt(#20013,#20003)
+exprContainers(#20013,#20001)
+literals("years","years",#20013)
+#20015=@"var;{years};{#20000}"
+variables(#20015,"years",#20000)
+bind(#20013,#20015)
+#20016=*
+exprs(#20016,29,#20005,-1,"year > 2000")
+#20017=@"loc,{#10000},1,26,1,36"
+locations_default(#20017,#10000,1,26,1,36)
+hasLocation(#20016,#20017)
+enclosingStmt(#20016,#20003)
+exprContainers(#20016,#20001)
+#20018=*
+exprs(#20018,79,#20016,0,"year")
+#20019=@"loc,{#10000},1,26,1,29"
+locations_default(#20019,#10000,1,26,1,29)
+hasLocation(#20018,#20019)
+enclosingStmt(#20018,#20003)
+exprContainers(#20018,#20001)
+literals("year","year",#20018)
+bind(#20018,#20010)
+#20020=*
+exprs(#20020,3,#20016,1,"2000")
+#20021=@"loc,{#10000},1,33,1,36"
+locations_default(#20021,#10000,1,33,1,36)
+hasLocation(#20020,#20021)
+enclosingStmt(#20020,#20003)
+exprContainers(#20020,#20001)
+literals("2000","2000",#20020)
+#20022=*
+exprs(#20022,79,#20005,0,"year")
+#20023=@"loc,{#10000},1,39,1,42"
+locations_default(#20023,#10000,1,39,1,42)
+hasLocation(#20022,#20023)
+enclosingStmt(#20022,#20003)
+exprContainers(#20022,#20001)
+literals("year","year",#20022)
+bind(#20022,#20010)
+#20024=*
+stmts(#20024,2,#20001,1,"year;")
+#20025=@"loc,{#10000},2,1,2,5"
+locations_default(#20025,#10000,2,1,2,5)
+hasLocation(#20024,#20025)
+stmtContainers(#20024,#20001)
+#20026=*
+exprs(#20026,79,#20024,0,"year")
+#20027=@"loc,{#10000},2,1,2,4"
+locations_default(#20027,#10000,2,1,2,4)
+hasLocation(#20026,#20027)
+enclosingStmt(#20026,#20024)
+exprContainers(#20026,#20001)
+literals("year","year",#20026)
+#20028=@"var;{year};{#20000}"
+variables(#20028,"year",#20000)
+bind(#20026,#20028)
+#20029=*
+stmts(#20029,2,#20001,2,"[for (i ... ) i+j];")
+#20030=@"loc,{#10000},3,1,3,44"
+locations_default(#20030,#10000,3,1,3,44)
+hasLocation(#20029,#20030)
+stmtContainers(#20029,#20001)
+#20031=*
+exprs(#20031,73,#20029,0,"[for (i ... s) i+j]")
+#20032=@"loc,{#10000},3,1,3,43"
+locations_default(#20032,#10000,3,1,3,43)
+hasLocation(#20031,#20032)
+enclosingStmt(#20031,#20029)
+exprContainers(#20031,#20001)
+#20033=*
+exprs(#20033,76,#20031,1,"for (i of numbers)")
+#20034=@"loc,{#10000},3,2,3,19"
+locations_default(#20034,#10000,3,2,3,19)
+hasLocation(#20033,#20034)
+enclosingStmt(#20033,#20029)
+exprContainers(#20033,#20001)
+#20035=*
+scopes(#20035,7)
+scopenodes(#20033,#20035)
+scopenesting(#20035,#20000)
+#20036=@"var;{i};{#20035}"
+variables(#20036,"i",#20035)
+#20037=*
+exprs(#20037,78,#20033,0,"i")
+#20038=@"loc,{#10000},3,7,3,7"
+locations_default(#20038,#10000,3,7,3,7)
+hasLocation(#20037,#20038)
+enclosingStmt(#20037,#20029)
+exprContainers(#20037,#20001)
+literals("i","i",#20037)
+decl(#20037,#20036)
+#20039=*
+exprs(#20039,79,#20033,1,"numbers")
+#20040=@"loc,{#10000},3,12,3,18"
+locations_default(#20040,#10000,3,12,3,18)
+hasLocation(#20039,#20040)
+enclosingStmt(#20039,#20029)
+exprContainers(#20039,#20001)
+literals("numbers","numbers",#20039)
+#20041=@"var;{numbers};{#20000}"
+variables(#20041,"numbers",#20000)
+bind(#20039,#20041)
+#20042=*
+exprs(#20042,76,#20031,2,"for (j of letters)")
+#20043=@"loc,{#10000},3,21,3,38"
+locations_default(#20043,#10000,3,21,3,38)
+hasLocation(#20042,#20043)
+enclosingStmt(#20042,#20029)
+exprContainers(#20042,#20001)
+#20044=*
+scopes(#20044,7)
+scopenodes(#20042,#20044)
+scopenesting(#20044,#20035)
+#20045=@"var;{j};{#20044}"
+variables(#20045,"j",#20044)
+#20046=*
+exprs(#20046,78,#20042,0,"j")
+#20047=@"loc,{#10000},3,26,3,26"
+locations_default(#20047,#10000,3,26,3,26)
+hasLocation(#20046,#20047)
+enclosingStmt(#20046,#20029)
+exprContainers(#20046,#20001)
+literals("j","j",#20046)
+decl(#20046,#20045)
+#20048=*
+exprs(#20048,79,#20042,1,"letters")
+#20049=@"loc,{#10000},3,31,3,37"
+locations_default(#20049,#10000,3,31,3,37)
+hasLocation(#20048,#20049)
+enclosingStmt(#20048,#20029)
+exprContainers(#20048,#20001)
+literals("letters","letters",#20048)
+#20050=@"var;{letters};{#20000}"
+variables(#20050,"letters",#20000)
+bind(#20048,#20050)
+#20051=*
+exprs(#20051,34,#20031,0,"i+j")
+#20052=@"loc,{#10000},3,40,3,42"
+locations_default(#20052,#10000,3,40,3,42)
+hasLocation(#20051,#20052)
+enclosingStmt(#20051,#20029)
+exprContainers(#20051,#20001)
+#20053=*
+exprs(#20053,79,#20051,0,"i")
+#20054=@"loc,{#10000},3,40,3,40"
+locations_default(#20054,#10000,3,40,3,40)
+hasLocation(#20053,#20054)
+enclosingStmt(#20053,#20029)
+exprContainers(#20053,#20001)
+literals("i","i",#20053)
+bind(#20053,#20036)
+#20055=*
+exprs(#20055,79,#20051,1,"j")
+#20056=@"loc,{#10000},3,42,3,42"
+locations_default(#20056,#10000,3,42,3,42)
+hasLocation(#20055,#20056)
+enclosingStmt(#20055,#20029)
+exprContainers(#20055,#20001)
+literals("j","j",#20055)
+bind(#20055,#20045)
+#20057=*
+stmts(#20057,2,#20001,3,"[for (i ... ) i+j];")
+#20058=@"loc,{#10000},4,1,4,53"
+locations_default(#20058,#10000,4,1,4,53)
+hasLocation(#20057,#20058)
+stmtContainers(#20057,#20001)
+#20059=*
+exprs(#20059,73,#20057,0,"[for (i ... j) i+j]")
+#20060=@"loc,{#10000},4,1,4,52"
+locations_default(#20060,#10000,4,1,4,52)
+hasLocation(#20059,#20060)
+enclosingStmt(#20059,#20057)
+exprContainers(#20059,#20001)
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new file mode 100644
index 00000000000..ff3a5c8061b
--- /dev/null
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diff --git a/javascript/extractor/tests/mozilla/output/trap/generator_expressions.js.trap b/javascript/extractor/tests/mozilla/output/trap/generator_expressions.js.trap
new file mode 100644
index 00000000000..594351b7e27
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/output/trap/generator_expressions.js.trap
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new file mode 100644
index 00000000000..c1f2d9d8eec
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new file mode 100644
index 00000000000..1169a114d32
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diff --git a/javascript/extractor/tests/mozilla/output/trap/letStmt2.js.trap b/javascript/extractor/tests/mozilla/output/trap/letStmt2.js.trap
new file mode 100644
index 00000000000..7a9bcc8c7c3
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/output/trap/letStmt2.js.trap
@@ -0,0 +1,121 @@
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diff --git a/javascript/extractor/tests/mozilla/output/trap/new-with-trailing-arg.js.trap b/javascript/extractor/tests/mozilla/output/trap/new-with-trailing-arg.js.trap
new file mode 100644
index 00000000000..0da2c334d93
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/output/trap/new-with-trailing-arg.js.trap
@@ -0,0 +1,223 @@
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diff --git a/javascript/extractor/tests/mozilla/output/trap/odasa-2593.js.trap b/javascript/extractor/tests/mozilla/output/trap/odasa-2593.js.trap
new file mode 100644
index 00000000000..549b87a613c
--- /dev/null
+++ b/javascript/extractor/tests/mozilla/output/trap/odasa-2593.js.trap
@@ -0,0 +1,209 @@
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+#20058=@"loc,{#10000},1,1,1,0"
+locations_default(#20058,#10000,1,1,1,0)
+hasLocation(#20057,#20058)
+#20059=*
+exit_cfg_node(#20059,#20001)
+hasLocation(#20059,#20056)
+successor(#20004,#20059)
+#20060=*
+entry_cfg_node(#20060,#20004)
+hasLocation(#20060,#20058)
+#20061=*
+exit_cfg_node(#20061,#20004)
+hasLocation(#20061,#20056)
+successor(#20009,#20013)
+successor(#20017,#20023)
+successor(#20024,#20061)
+successor(#20023,#20021)
+successor(#20021,#20024)
+successor(#20013,#20015)
+successor(#20015,#20017)
+successor(#20060,#20009)
+successor(#20005,#20004)
+successor(#20057,#20005)
+numlines(#10000,4,4,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/node/input/constlet.js b/javascript/extractor/tests/node/input/constlet.js
new file mode 100644
index 00000000000..8f2457ce8b4
--- /dev/null
+++ b/javascript/extractor/tests/node/input/constlet.js
@@ -0,0 +1,2 @@
+const x = 23;
+let y = 42;
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/empty b/javascript/extractor/tests/node/input/empty
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/javascript/extractor/tests/node/input/f/ignored.json b/javascript/extractor/tests/node/input/f/ignored.json
new file mode 100644
index 00000000000..9e26dfeeb6e
--- /dev/null
+++ b/javascript/extractor/tests/node/input/f/ignored.json
@@ -0,0 +1 @@
+{}
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/f/package.json b/javascript/extractor/tests/node/input/f/package.json
new file mode 100644
index 00000000000..41a3f33289d
--- /dev/null
+++ b/javascript/extractor/tests/node/input/f/package.json
@@ -0,0 +1 @@
+"i get extracted"
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/g/hello b/javascript/extractor/tests/node/input/g/hello
new file mode 100644
index 00000000000..1b7d321578e
--- /dev/null
+++ b/javascript/extractor/tests/node/input/g/hello
@@ -0,0 +1,2 @@
+#!/usr/bin/env node
+console.log("Hello, world!");
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/tst.html b/javascript/extractor/tests/node/input/tst.html
new file mode 100644
index 00000000000..bc15b3827d3
--- /dev/null
+++ b/javascript/extractor/tests/node/input/tst.html
@@ -0,0 +1,8 @@
+<html>
+<head>
+<title></title>
+</head>
+<body>
+<a onclick="var x = 42;"></a>
+</body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/tst.js b/javascript/extractor/tests/node/input/tst.js
new file mode 100644
index 00000000000..f7e66501f5b
--- /dev/null
+++ b/javascript/extractor/tests/node/input/tst.js
@@ -0,0 +1,4 @@
+var fs = require('fs');
+y = 42;
+console.log(__filename);
+return arguments[0];
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/input/tst.mjs b/javascript/extractor/tests/node/input/tst.mjs
new file mode 100644
index 00000000000..3589a15ddc7
--- /dev/null
+++ b/javascript/extractor/tests/node/input/tst.mjs
@@ -0,0 +1 @@
+var x;
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/options.json b/javascript/extractor/tests/node/options.json
new file mode 100644
index 00000000000..d096c8f0c2d
--- /dev/null
+++ b/javascript/extractor/tests/node/options.json
@@ -0,0 +1,3 @@
+{
+    "nodejs": true
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/node/output/trap/constlet.js.trap b/javascript/extractor/tests/node/output/trap/constlet.js.trap
new file mode 100644
index 00000000000..8fa9767644c
--- /dev/null
+++ b/javascript/extractor/tests/node/output/trap/constlet.js.trap
@@ -0,0 +1,179 @@
+#10000=@"/constlet.js;sourcefile"
+files(#10000,"/constlet.js","constlet","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,11"
+locations_default(#20002,#10000,1,1,2,11)
+hasLocation(#20001,#20002)
+#20003=@"var;{global};{#20000}"
+variables(#20003,"global",#20000)
+#20004=@"var;{process};{#20000}"
+variables(#20004,"process",#20000)
+#20005=@"var;{console};{#20000}"
+variables(#20005,"console",#20000)
+#20006=@"var;{Buffer};{#20000}"
+variables(#20006,"Buffer",#20000)
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+scopes(#20007,3)
+scopenodes(#20001,#20007)
+scopenesting(#20007,#20000)
+#20008=@"var;{require};{#20007}"
+variables(#20008,"require",#20007)
+#20009=@"var;{module};{#20007}"
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+#20010=@"var;{exports};{#20007}"
+variables(#20010,"exports",#20007)
+#20011=@"var;{__filename};{#20007}"
+variables(#20011,"__filename",#20007)
+#20012=@"var;{__dirname};{#20007}"
+variables(#20012,"__dirname",#20007)
+#20013=@"var;{arguments};{#20007}"
+variables(#20013,"arguments",#20007)
+isModule(#20001)
+#20014=@"var;{x};{#20007}"
+variables(#20014,"x",#20007)
+#20015=@"var;{y};{#20007}"
+variables(#20015,"y",#20007)
+#20016=*
+stmts(#20016,22,#20001,0,"const x = 23;")
+#20017=@"loc,{#10000},1,1,1,13"
+locations_default(#20017,#10000,1,1,1,13)
+hasLocation(#20016,#20017)
+stmtContainers(#20016,#20001)
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+exprs(#20018,64,#20016,0,"x = 23")
+#20019=@"loc,{#10000},1,7,1,12"
+locations_default(#20019,#10000,1,7,1,12)
+hasLocation(#20018,#20019)
+enclosingStmt(#20018,#20016)
+exprContainers(#20018,#20001)
+#20020=*
+exprs(#20020,78,#20018,0,"x")
+#20021=@"loc,{#10000},1,7,1,7"
+locations_default(#20021,#10000,1,7,1,7)
+hasLocation(#20020,#20021)
+enclosingStmt(#20020,#20016)
+exprContainers(#20020,#20001)
+literals("x","x",#20020)
+decl(#20020,#20014)
+#20022=*
+exprs(#20022,3,#20018,1,"23")
+#20023=@"loc,{#10000},1,11,1,12"
+locations_default(#20023,#10000,1,11,1,12)
+hasLocation(#20022,#20023)
+enclosingStmt(#20022,#20016)
+exprContainers(#20022,#20001)
+literals("23","23",#20022)
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+locations_default(#20025,#10000,2,1,2,11)
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+locations_default(#20027,#10000,2,5,2,10)
+hasLocation(#20026,#20027)
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+exprs(#20030,3,#20026,1,"42")
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+#20032=*
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+")
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+#20053=@"loc,{#10000},1,1,1,0"
+locations_default(#20053,#10000,1,1,1,0)
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+exit_cfg_node(#20054,#20001)
+hasLocation(#20054,#20051)
+successor(#20024,#20028)
+successor(#20030,#20026)
+successor(#20028,#20030)
+successor(#20026,#20054)
+successor(#20016,#20020)
+successor(#20022,#20018)
+successor(#20020,#20022)
+successor(#20018,#20024)
+successor(#20052,#20016)
+isNodejs(#20001)
+numlines(#10000,2,2,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/node/output/trap/hello.trap b/javascript/extractor/tests/node/output/trap/hello.trap
new file mode 100644
index 00000000000..e56576fa626
--- /dev/null
+++ b/javascript/extractor/tests/node/output/trap/hello.trap
@@ -0,0 +1,148 @@
+#10000=@"/g/hello;sourcefile"
+files(#10000,"/g/hello","hello","",0)
+#10001=@"/g;folder"
+folders(#10001,"/g","g")
+#10002=@"/;folder"
+folders(#10002,"/","")
+containerparent(#10002,#10001)
+containerparent(#10001,#10000)
+#10003=@"loc,{#10000},0,0,0,0"
+locations_default(#10003,#10000,0,0,0,0)
+hasLocation(#10000,#10003)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},2,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},2,1,2,29"
+locations_default(#20002,#10000,2,1,2,29)
+hasLocation(#20001,#20002)
+#20003=@"var;{global};{#20000}"
+variables(#20003,"global",#20000)
+#20004=@"var;{process};{#20000}"
+variables(#20004,"process",#20000)
+#20005=@"var;{console};{#20000}"
+variables(#20005,"console",#20000)
+#20006=@"var;{Buffer};{#20000}"
+variables(#20006,"Buffer",#20000)
+#20007=@"module;{#10000},2,1"
+scopes(#20007,3)
+scopenodes(#20001,#20007)
+scopenesting(#20007,#20000)
+#20008=@"var;{require};{#20007}"
+variables(#20008,"require",#20007)
+#20009=@"var;{module};{#20007}"
+variables(#20009,"module",#20007)
+#20010=@"var;{exports};{#20007}"
+variables(#20010,"exports",#20007)
+#20011=@"var;{__filename};{#20007}"
+variables(#20011,"__filename",#20007)
+#20012=@"var;{__dirname};{#20007}"
+variables(#20012,"__dirname",#20007)
+#20013=@"var;{arguments};{#20007}"
+variables(#20013,"arguments",#20007)
+isModule(#20001)
+#20014=*
+stmts(#20014,2,#20001,0,"console ... rld!"");")
+hasLocation(#20014,#20002)
+stmtContainers(#20014,#20001)
+#20015=*
+exprs(#20015,13,#20014,0,"console ... orld!"")")
+#20016=@"loc,{#10000},2,1,2,28"
+locations_default(#20016,#10000,2,1,2,28)
+hasLocation(#20015,#20016)
+enclosingStmt(#20015,#20014)
+exprContainers(#20015,#20001)
+#20017=*
+exprs(#20017,14,#20015,-1,"console.log")
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+locations_default(#20018,#10000,2,1,2,11)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20014)
+exprContainers(#20017,#20001)
+#20019=*
+exprs(#20019,79,#20017,0,"console")
+#20020=@"loc,{#10000},2,1,2,7"
+locations_default(#20020,#10000,2,1,2,7)
+hasLocation(#20019,#20020)
+enclosingStmt(#20019,#20014)
+exprContainers(#20019,#20001)
+literals("console","console",#20019)
+bind(#20019,#20005)
+#20021=*
+exprs(#20021,0,#20017,1,"log")
+#20022=@"loc,{#10000},2,9,2,11"
+locations_default(#20022,#10000,2,9,2,11)
+hasLocation(#20021,#20022)
+enclosingStmt(#20021,#20014)
+exprContainers(#20021,#20001)
+literals("log","log",#20021)
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+exprs(#20023,4,#20015,0,"""Hello, world!""")
+#20024=@"loc,{#10000},2,13,2,27"
+locations_default(#20024,#10000,2,13,2,27)
+hasLocation(#20023,#20024)
+enclosingStmt(#20023,#20014)
+exprContainers(#20023,#20001)
+literals("Hello, world!","""Hello, world!""",#20023)
+#20025=*
+lines(#20025,#20001,"console.log(""Hello, world!"");","")
+hasLocation(#20025,#20002)
+numlines(#20001,1,1,0)
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+tokeninfo(#20026,6,#20001,0,"console")
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+#20040=@"loc,{#10000},2,1,2,0"
+locations_default(#20040,#10000,2,1,2,0)
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+hasLocation(#20041,#20038)
+successor(#20014,#20019)
+successor(#20023,#20015)
+successor(#20021,#20017)
+successor(#20019,#20021)
+successor(#20017,#20023)
+successor(#20015,#20041)
+successor(#20039,#20014)
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+#20042=*
+lines(#20042,#20001,"#!/usr/bin/env node","
+")
+#20043=@"loc,{#10000},1,1,1,19"
+locations_default(#20043,#10000,1,1,1,19)
+hasLocation(#20042,#20043)
+numlines(#10000,2,1,0)
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diff --git a/javascript/extractor/tests/node/output/trap/package.json.trap b/javascript/extractor/tests/node/output/trap/package.json.trap
new file mode 100644
index 00000000000..0956b01c53b
--- /dev/null
+++ b/javascript/extractor/tests/node/output/trap/package.json.trap
@@ -0,0 +1,19 @@
+#10000=@"/f/package.json;sourcefile"
+files(#10000,"/f/package.json","package","json",0)
+#10001=@"/f;folder"
+folders(#10001,"/f","f")
+#10002=@"/;folder"
+folders(#10002,"/","")
+containerparent(#10002,#10001)
+containerparent(#10001,#10000)
+#10003=@"loc,{#10000},0,0,0,0"
+locations_default(#10003,#10000,0,0,0,0)
+hasLocation(#10000,#10003)
+#20000=*
+json(#20000,3,#10000,0,"""i get extracted""")
+#20001=@"loc,{#10000},1,1,1,17"
+locations_default(#20001,#10000,1,1,1,17)
+hasLocation(#20000,#20001)
+json_literals("i get extracted","""i get extracted""",#20000)
+numlines(#10000,1,0,0)
+filetype(#10000,"json")
diff --git a/javascript/extractor/tests/node/output/trap/tst.html.trap b/javascript/extractor/tests/node/output/trap/tst.html.trap
new file mode 100644
index 00000000000..995cb0f3ecb
--- /dev/null
+++ b/javascript/extractor/tests/node/output/trap/tst.html.trap
@@ -0,0 +1,120 @@
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+files(#10000,"/tst.html","tst","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
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+scopes(#20000,0)
+#20001=@"script;{#10000},6,13"
+toplevels(#20001,2)
+#20002=@"loc,{#10000},6,13,6,23"
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+#20003=@"var;{x};{#20000}"
+variables(#20003,"x",#20000)
+#20004=*
+stmts(#20004,18,#20001,0,"var x = 42;")
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+stmtContainers(#20004,#20001)
+#20005=*
+exprs(#20005,64,#20004,0,"x = 42")
+#20006=@"loc,{#10000},6,17,6,22"
+locations_default(#20006,#10000,6,17,6,22)
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+exprs(#20009,3,#20005,1,"42")
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diff --git a/javascript/extractor/tests/node/output/trap/tst.js.trap b/javascript/extractor/tests/node/output/trap/tst.js.trap
new file mode 100644
index 00000000000..7d68c464523
--- /dev/null
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diff --git a/javascript/extractor/tests/node/output/trap/tst.mjs.trap b/javascript/extractor/tests/node/output/trap/tst.mjs.trap
new file mode 100644
index 00000000000..a8608dce6fe
--- /dev/null
+++ b/javascript/extractor/tests/node/output/trap/tst.mjs.trap
@@ -0,0 +1,84 @@
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diff --git a/javascript/extractor/tests/project-layout b/javascript/extractor/tests/project-layout
new file mode 100644
index 00000000000..173b219894c
--- /dev/null
+++ b/javascript/extractor/tests/project-layout
@@ -0,0 +1 @@
+**/packs/javascript/extractor/tests/*/input//
diff --git a/javascript/extractor/tests/rcfiles/input/.babelrc b/javascript/extractor/tests/rcfiles/input/.babelrc
new file mode 100644
index 00000000000..2104ca43283
--- /dev/null
+++ b/javascript/extractor/tests/rcfiles/input/.babelrc
@@ -0,0 +1,3 @@
+{
+  "sourceType": "module"
+}
diff --git a/javascript/extractor/tests/rcfiles/input/.eslintrc b/javascript/extractor/tests/rcfiles/input/.eslintrc
new file mode 100644
index 00000000000..8dafe48e325
--- /dev/null
+++ b/javascript/extractor/tests/rcfiles/input/.eslintrc
@@ -0,0 +1,3 @@
+{
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+}
diff --git a/javascript/extractor/tests/rcfiles/input/.npmrc b/javascript/extractor/tests/rcfiles/input/.npmrc
new file mode 100644
index 00000000000..f4e5d9d2029
--- /dev/null
+++ b/javascript/extractor/tests/rcfiles/input/.npmrc
@@ -0,0 +1 @@
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diff --git a/javascript/extractor/tests/rcfiles/output/trap/.babelrc.trap b/javascript/extractor/tests/rcfiles/output/trap/.babelrc.trap
new file mode 100644
index 00000000000..653a7d69968
--- /dev/null
+++ b/javascript/extractor/tests/rcfiles/output/trap/.babelrc.trap
@@ -0,0 +1,22 @@
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new file mode 100644
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diff --git a/javascript/extractor/tests/regexp/input/es2018.js b/javascript/extractor/tests/regexp/input/es2018.js
new file mode 100644
index 00000000000..f7d0d826b2c
--- /dev/null
+++ b/javascript/extractor/tests/regexp/input/es2018.js
@@ -0,0 +1,5 @@
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diff --git a/javascript/extractor/tests/regexp/input/nonstandard.js b/javascript/extractor/tests/regexp/input/nonstandard.js
new file mode 100644
index 00000000000..b48ca47a43a
--- /dev/null
+++ b/javascript/extractor/tests/regexp/input/nonstandard.js
@@ -0,0 +1 @@
+/dice/y;
\ No newline at end of file
diff --git a/javascript/extractor/tests/regexp/input/odasa-1934.js b/javascript/extractor/tests/regexp/input/odasa-1934.js
new file mode 100644
index 00000000000..6ee8a0e4307
--- /dev/null
+++ b/javascript/extractor/tests/regexp/input/odasa-1934.js
@@ -0,0 +1,7 @@
+var r;
+
+reportCompare(
+  "x",
+  (r = /[\x]+/.exec("x")) && r[0],
+  "Section 1"
+);
\ No newline at end of file
diff --git a/javascript/extractor/tests/regexp/output/trap/es2018.js.trap b/javascript/extractor/tests/regexp/output/trap/es2018.js.trap
new file mode 100644
index 00000000000..e1835090830
--- /dev/null
+++ b/javascript/extractor/tests/regexp/output/trap/es2018.js.trap
@@ -0,0 +1,257 @@
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diff --git a/javascript/extractor/tests/regexp/output/trap/nonstandard.js.trap b/javascript/extractor/tests/regexp/output/trap/nonstandard.js.trap
new file mode 100644
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diff --git a/javascript/extractor/tests/restprops/input/tst.js b/javascript/extractor/tests/restprops/input/tst.js
new file mode 100644
index 00000000000..c695a1af2d3
--- /dev/null
+++ b/javascript/extractor/tests/restprops/input/tst.js
@@ -0,0 +1 @@
+var f = ({...p}) => {};
diff --git a/javascript/extractor/tests/restprops/options.json b/javascript/extractor/tests/restprops/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/restprops/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/restprops/output/trap/tst.js.trap b/javascript/extractor/tests/restprops/output/trap/tst.js.trap
new file mode 100644
index 00000000000..e63c1f116bc
--- /dev/null
+++ b/javascript/extractor/tests/restprops/output/trap/tst.js.trap
@@ -0,0 +1,173 @@
+#10000=@"/tst.js;sourcefile"
+files(#10000,"/tst.js","tst","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,0"
+locations_default(#20002,#10000,1,1,2,0)
+hasLocation(#20001,#20002)
+#20003=@"var;{f};{#20000}"
+variables(#20003,"f",#20000)
+#20004=*
+stmts(#20004,18,#20001,0,"var f = ...  => {};")
+#20005=@"loc,{#10000},1,1,1,23"
+locations_default(#20005,#10000,1,1,1,23)
+hasLocation(#20004,#20005)
+stmtContainers(#20004,#20001)
+#20006=*
+exprs(#20006,64,#20004,0,"f = ({...p}) => {}")
+#20007=@"loc,{#10000},1,5,1,22"
+locations_default(#20007,#10000,1,5,1,22)
+hasLocation(#20006,#20007)
+enclosingStmt(#20006,#20004)
+exprContainers(#20006,#20001)
+#20008=*
+exprs(#20008,78,#20006,0,"f")
+#20009=@"loc,{#10000},1,5,1,5"
+locations_default(#20009,#10000,1,5,1,5)
+hasLocation(#20008,#20009)
+enclosingStmt(#20008,#20004)
+exprContainers(#20008,#20001)
+literals("f","f",#20008)
+decl(#20008,#20003)
+#20010=*
+exprs(#20010,65,#20006,1,"({...p}) => {}")
+#20011=@"loc,{#10000},1,9,1,22"
+locations_default(#20011,#10000,1,9,1,22)
+hasLocation(#20010,#20011)
+enclosingStmt(#20010,#20004)
+exprContainers(#20010,#20001)
+#20012=*
+scopes(#20012,1)
+scopenodes(#20010,#20012)
+scopenesting(#20012,#20000)
+#20013=@"var;{p};{#20012}"
+variables(#20013,"p",#20012)
+#20014=*
+exprs(#20014,68,#20010,0,"{...p}")
+#20015=@"loc,{#10000},1,10,1,15"
+locations_default(#20015,#10000,1,10,1,15)
+hasLocation(#20014,#20015)
+exprContainers(#20014,#20010)
+#20016=*
+exprs(#20016,78,#20014,-1,"p")
+#20017=@"loc,{#10000},1,14,1,14"
+locations_default(#20017,#10000,1,14,1,14)
+hasLocation(#20016,#20017)
+exprContainers(#20016,#20010)
+literals("p","p",#20016)
+decl(#20016,#20013)
+#20018=*
+stmts(#20018,1,#20010,-2,"{}")
+#20019=@"loc,{#10000},1,21,1,22"
+locations_default(#20019,#10000,1,21,1,22)
+hasLocation(#20018,#20019)
+stmtContainers(#20018,#20010)
+numlines(#20010,1,1,0)
+#20020=*
+lines(#20020,#20001,"var f = ({...p}) => {};","
+")
+hasLocation(#20020,#20005)
+numlines(#20001,1,1,0)
+#20021=*
+tokeninfo(#20021,7,#20001,0,"var")
+#20022=@"loc,{#10000},1,1,1,3"
+locations_default(#20022,#10000,1,1,1,3)
+hasLocation(#20021,#20022)
+#20023=*
+tokeninfo(#20023,6,#20001,1,"f")
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+#20024=*
+tokeninfo(#20024,8,#20001,2,"=")
+#20025=@"loc,{#10000},1,7,1,7"
+locations_default(#20025,#10000,1,7,1,7)
+hasLocation(#20024,#20025)
+#20026=*
+tokeninfo(#20026,8,#20001,3,"(")
+#20027=@"loc,{#10000},1,9,1,9"
+locations_default(#20027,#10000,1,9,1,9)
+hasLocation(#20026,#20027)
+#20028=*
+tokeninfo(#20028,8,#20001,4,"{")
+#20029=@"loc,{#10000},1,10,1,10"
+locations_default(#20029,#10000,1,10,1,10)
+hasLocation(#20028,#20029)
+#20030=*
+tokeninfo(#20030,8,#20001,5,"...")
+#20031=@"loc,{#10000},1,11,1,13"
+locations_default(#20031,#10000,1,11,1,13)
+hasLocation(#20030,#20031)
+#20032=*
+tokeninfo(#20032,6,#20001,6,"p")
+hasLocation(#20032,#20017)
+#20033=*
+tokeninfo(#20033,8,#20001,7,"}")
+#20034=@"loc,{#10000},1,15,1,15"
+locations_default(#20034,#10000,1,15,1,15)
+hasLocation(#20033,#20034)
+#20035=*
+tokeninfo(#20035,8,#20001,8,")")
+#20036=@"loc,{#10000},1,16,1,16"
+locations_default(#20036,#10000,1,16,1,16)
+hasLocation(#20035,#20036)
+#20037=*
+tokeninfo(#20037,8,#20001,9,"=>")
+#20038=@"loc,{#10000},1,18,1,19"
+locations_default(#20038,#10000,1,18,1,19)
+hasLocation(#20037,#20038)
+#20039=*
+tokeninfo(#20039,8,#20001,10,"{")
+#20040=@"loc,{#10000},1,21,1,21"
+locations_default(#20040,#10000,1,21,1,21)
+hasLocation(#20039,#20040)
+#20041=*
+tokeninfo(#20041,8,#20001,11,"}")
+#20042=@"loc,{#10000},1,22,1,22"
+locations_default(#20042,#10000,1,22,1,22)
+hasLocation(#20041,#20042)
+#20043=*
+tokeninfo(#20043,8,#20001,12,";")
+#20044=@"loc,{#10000},1,23,1,23"
+locations_default(#20044,#10000,1,23,1,23)
+hasLocation(#20043,#20044)
+#20045=*
+tokeninfo(#20045,0,#20001,13,"")
+#20046=@"loc,{#10000},2,1,2,0"
+locations_default(#20046,#10000,2,1,2,0)
+hasLocation(#20045,#20046)
+#20047=*
+entry_cfg_node(#20047,#20001)
+#20048=@"loc,{#10000},1,1,1,0"
+locations_default(#20048,#10000,1,1,1,0)
+hasLocation(#20047,#20048)
+#20049=*
+exit_cfg_node(#20049,#20001)
+hasLocation(#20049,#20046)
+successor(#20004,#20008)
+successor(#20010,#20006)
+#20050=*
+entry_cfg_node(#20050,#20010)
+#20051=@"loc,{#10000},1,9,1,8"
+locations_default(#20051,#10000,1,9,1,8)
+hasLocation(#20050,#20051)
+#20052=*
+exit_cfg_node(#20052,#20010)
+#20053=@"loc,{#10000},1,23,1,22"
+locations_default(#20053,#10000,1,23,1,22)
+hasLocation(#20052,#20053)
+successor(#20018,#20052)
+successor(#20014,#20016)
+successor(#20016,#20018)
+successor(#20050,#20014)
+successor(#20008,#20010)
+successor(#20006,#20049)
+successor(#20047,#20004)
+numlines(#10000,1,1,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/shebang/input/tst.html b/javascript/extractor/tests/shebang/input/tst.html
new file mode 100644
index 00000000000..872c6709fea
--- /dev/null
+++ b/javascript/extractor/tests/shebang/input/tst.html
@@ -0,0 +1,10 @@
+<html>
+    <head>
+        <script>
+#!/usr/bin/node
+// shebang in HTML is not OK
+        </script>
+    </head>
+    <body>
+    </body>
+</html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/shebang/input/tst.js b/javascript/extractor/tests/shebang/input/tst.js
new file mode 100644
index 00000000000..401b38c1998
--- /dev/null
+++ b/javascript/extractor/tests/shebang/input/tst.js
@@ -0,0 +1,2 @@
+#!/usr/bin/node
+alert("Hi!");
\ No newline at end of file
diff --git a/javascript/extractor/tests/shebang/output/trap/tst.html.trap b/javascript/extractor/tests/shebang/output/trap/tst.html.trap
new file mode 100644
index 00000000000..525df65c352
--- /dev/null
+++ b/javascript/extractor/tests/shebang/output/trap/tst.html.trap
@@ -0,0 +1,67 @@
+#10000=@"/tst.html;sourcefile"
+files(#10000,"/tst.html","tst","html",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},3,17"
+toplevels(#20001,1)
+#20002=@"loc,{#10000},3,17,3,17"
+locations_default(#20002,#10000,3,17,3,17)
+hasLocation(#20001,#20002)
+#20003=*
+jsParseErrors(#20003,#20001,"Error: Unexpected character '#'","#!/usr/bin/node
+")
+#20004=@"loc,{#10000},4,1,4,1"
+locations_default(#20004,#10000,4,1,4,1)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"","
+")
+#20006=@"loc,{#10000},3,17,3,16"
+locations_default(#20006,#10000,3,17,3,16)
+hasLocation(#20005,#20006)
+#20007=*
+lines(#20007,#20001,"#!/usr/bin/node","
+")
+#20008=@"loc,{#10000},4,1,4,15"
+locations_default(#20008,#10000,4,1,4,15)
+hasLocation(#20007,#20008)
+#20009=*
+lines(#20009,#20001,"// shebang in HTML is not OK","
+")
+#20010=@"loc,{#10000},5,1,5,28"
+locations_default(#20010,#10000,5,1,5,28)
+hasLocation(#20009,#20010)
+#20011=*
+lines(#20011,#20001,"        ","")
+#20012=@"loc,{#10000},6,1,6,8"
+locations_default(#20012,#10000,6,1,6,8)
+hasLocation(#20011,#20012)
+numlines(#20001,4,0,0)
+#20013=*
+xmlElements(#20013,"html",#10000,0,#10000)
+#20014=@"loc,{#10000},1,1,10,7"
+locations_default(#20014,#10000,1,1,10,7)
+xmllocations(#20013,#20014)
+#20015=*
+xmlElements(#20015,"head",#20013,0,#10000)
+#20016=@"loc,{#10000},2,5,7,11"
+locations_default(#20016,#10000,2,5,7,11)
+xmllocations(#20015,#20016)
+#20017=*
+xmlElements(#20017,"body",#20013,1,#10000)
+#20018=@"loc,{#10000},8,5,9,11"
+locations_default(#20018,#10000,8,5,9,11)
+xmllocations(#20017,#20018)
+#20019=*
+xmlElements(#20019,"script",#20015,0,#10000)
+#20020=@"loc,{#10000},3,9,6,17"
+locations_default(#20020,#10000,3,9,6,17)
+xmllocations(#20019,#20020)
+numlines(#10000,10,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/shebang/output/trap/tst.js.trap b/javascript/extractor/tests/shebang/output/trap/tst.js.trap
new file mode 100644
index 00000000000..af22a7a7af9
--- /dev/null
+++ b/javascript/extractor/tests/shebang/output/trap/tst.js.trap
@@ -0,0 +1,122 @@
+#10000=@"/tst.js;sourcefile"
+files(#10000,"/tst.js","tst","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},2,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},2,1,2,13"
+locations_default(#20002,#10000,2,1,2,13)
+hasLocation(#20001,#20002)
+#20003=@"var;{global};{#20000}"
+variables(#20003,"global",#20000)
+#20004=@"var;{process};{#20000}"
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+#20005=@"var;{console};{#20000}"
+variables(#20005,"console",#20000)
+#20006=@"var;{Buffer};{#20000}"
+variables(#20006,"Buffer",#20000)
+#20007=@"module;{#10000},2,1"
+scopes(#20007,3)
+scopenodes(#20001,#20007)
+scopenesting(#20007,#20000)
+#20008=@"var;{require};{#20007}"
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+#20009=@"var;{module};{#20007}"
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+#20013=@"var;{arguments};{#20007}"
+variables(#20013,"arguments",#20007)
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+#20014=*
+stmts(#20014,2,#20001,0,"alert(""Hi!"");")
+hasLocation(#20014,#20002)
+stmtContainers(#20014,#20001)
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+exprs(#20015,13,#20014,0,"alert(""Hi!"")")
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+locations_default(#20016,#10000,2,1,2,12)
+hasLocation(#20015,#20016)
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+exprContainers(#20015,#20001)
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+exprs(#20017,79,#20015,-1,"alert")
+#20018=@"loc,{#10000},2,1,2,5"
+locations_default(#20018,#10000,2,1,2,5)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20014)
+exprContainers(#20017,#20001)
+literals("alert","alert",#20017)
+#20019=@"var;{alert};{#20000}"
+variables(#20019,"alert",#20000)
+bind(#20017,#20019)
+#20020=*
+exprs(#20020,4,#20015,0,"""Hi!""")
+#20021=@"loc,{#10000},2,7,2,11"
+locations_default(#20021,#10000,2,7,2,11)
+hasLocation(#20020,#20021)
+enclosingStmt(#20020,#20014)
+exprContainers(#20020,#20001)
+literals("Hi!","""Hi!""",#20020)
+#20022=*
+lines(#20022,#20001,"alert(""Hi!"");","")
+hasLocation(#20022,#20002)
+numlines(#20001,1,1,0)
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+tokeninfo(#20023,6,#20001,0,"alert")
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+#20024=*
+tokeninfo(#20024,8,#20001,1,"(")
+#20025=@"loc,{#10000},2,6,2,6"
+locations_default(#20025,#10000,2,6,2,6)
+hasLocation(#20024,#20025)
+#20026=*
+tokeninfo(#20026,4,#20001,2,"""Hi!""")
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+tokeninfo(#20027,8,#20001,3,")")
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+locations_default(#20028,#10000,2,12,2,12)
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+locations_default(#20032,#10000,2,14,2,13)
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+#20034=@"loc,{#10000},2,1,2,0"
+locations_default(#20034,#10000,2,1,2,0)
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+#20035=*
+exit_cfg_node(#20035,#20001)
+hasLocation(#20035,#20032)
+successor(#20014,#20017)
+successor(#20020,#20015)
+successor(#20017,#20020)
+successor(#20015,#20035)
+successor(#20033,#20014)
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+")
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+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/stmts/input/conditionals.js b/javascript/extractor/tests/stmts/input/conditionals.js
new file mode 100644
index 00000000000..e21a4299f87
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/conditionals.js
@@ -0,0 +1,12 @@
+if (true)
+    ;
+if (b)
+    ;
+else
+    ;
+switch (b) {
+case 23:
+case c:
+    break;
+default:
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/stmts/input/forvardefault.js b/javascript/extractor/tests/stmts/input/forvardefault.js
new file mode 100644
index 00000000000..45b7708a59c
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/forvardefault.js
@@ -0,0 +1,3 @@
+for (a = 1 in b) f();
+
+for (c = 0 of d) g();
\ No newline at end of file
diff --git a/javascript/extractor/tests/stmts/input/functions.js b/javascript/extractor/tests/stmts/input/functions.js
new file mode 100644
index 00000000000..1dc9724687b
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/functions.js
@@ -0,0 +1,13 @@
+function g(x, y) {
+    return x+y;
+}
+
+function h() {}
+
+k = function() {
+    return;
+}
+
+l = function f() {}
+
+function() {}
diff --git a/javascript/extractor/tests/stmts/input/loops.js b/javascript/extractor/tests/stmts/input/loops.js
new file mode 100644
index 00000000000..84028192cee
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/loops.js
@@ -0,0 +1,21 @@
+while(true)
+    ;
+outer: for(a; b; c) {
+    for(;;)
+        if (d)
+            continue outer;
+        else if (e)
+            break outer;
+        else
+            continue;
+}
+
+do {
+    ;
+} while(a);
+
+for (var i=0,n=10; i<n; ++i);
+
+for (var x in xs);
+for (x in xs);
+for (x.f in xs);
diff --git a/javascript/extractor/tests/stmts/input/others.js b/javascript/extractor/tests/stmts/input/others.js
new file mode 100644
index 00000000000..3b2a62a47bf
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/others.js
@@ -0,0 +1,4 @@
+with(a) {
+}
+debugger;
+var x = 23, y;
\ No newline at end of file
diff --git a/javascript/extractor/tests/stmts/input/switch.js b/javascript/extractor/tests/stmts/input/switch.js
new file mode 100644
index 00000000000..86dfa5004b2
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/switch.js
@@ -0,0 +1,17 @@
+switch (x) {
+default:
+    break;
+case 23:
+    x += 19;
+}
+
+function f() {
+    switch(x) {
+    case 0:
+        return 23;
+    default:
+        return 42;
+    case 1:
+        return 56;
+    }
+}
diff --git a/javascript/extractor/tests/stmts/input/switch2.js b/javascript/extractor/tests/stmts/input/switch2.js
new file mode 100644
index 00000000000..c0d1b8acbaf
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/switch2.js
@@ -0,0 +1,9 @@
+function f() {
+    switch(x) {
+    case 0:
+    default:
+        return 42;
+    case 1:
+        return 56;
+    }
+}
diff --git a/javascript/extractor/tests/stmts/input/trivial-switch.js b/javascript/extractor/tests/stmts/input/trivial-switch.js
new file mode 100644
index 00000000000..733bc767482
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/trivial-switch.js
@@ -0,0 +1 @@
+switch(x){}
diff --git a/javascript/extractor/tests/stmts/input/try.js b/javascript/extractor/tests/stmts/input/try.js
new file mode 100644
index 00000000000..0151114bf84
--- /dev/null
+++ b/javascript/extractor/tests/stmts/input/try.js
@@ -0,0 +1,5 @@
+try {
+    throw "!";
+} catch(x) { ; }
+try {} finally { ; }
+try {} catch(x) {} finally {}
\ No newline at end of file
diff --git a/javascript/extractor/tests/stmts/output/trap/conditionals.js.trap b/javascript/extractor/tests/stmts/output/trap/conditionals.js.trap
new file mode 100644
index 00000000000..fd159bb25e5
--- /dev/null
+++ b/javascript/extractor/tests/stmts/output/trap/conditionals.js.trap
@@ -0,0 +1,356 @@
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+files(#10000,"/conditionals.js","conditionals","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
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+hasLocation(#10000,#10002)
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+enclosingStmt(#20005,#20003)
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+")
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diff --git a/javascript/extractor/tests/stmts/output/trap/forvardefault.js.trap b/javascript/extractor/tests/stmts/output/trap/forvardefault.js.trap
new file mode 100644
index 00000000000..cd7ed71f553
--- /dev/null
+++ b/javascript/extractor/tests/stmts/output/trap/forvardefault.js.trap
@@ -0,0 +1,285 @@
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diff --git a/javascript/extractor/tests/stmts/output/trap/functions.js.trap b/javascript/extractor/tests/stmts/output/trap/functions.js.trap
new file mode 100644
index 00000000000..9d276e0aaf2
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diff --git a/javascript/extractor/tests/stmts/output/trap/loops.js.trap b/javascript/extractor/tests/stmts/output/trap/loops.js.trap
new file mode 100644
index 00000000000..8bd1f947ba6
--- /dev/null
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diff --git a/javascript/extractor/tests/stmts/output/trap/others.js.trap b/javascript/extractor/tests/stmts/output/trap/others.js.trap
new file mode 100644
index 00000000000..14c21eb1c04
--- /dev/null
+++ b/javascript/extractor/tests/stmts/output/trap/others.js.trap
@@ -0,0 +1,203 @@
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diff --git a/javascript/extractor/tests/stmts/output/trap/switch.js.trap b/javascript/extractor/tests/stmts/output/trap/switch.js.trap
new file mode 100644
index 00000000000..d143e1e6e58
--- /dev/null
+++ b/javascript/extractor/tests/stmts/output/trap/switch.js.trap
@@ -0,0 +1,583 @@
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index 00000000000..3e62d114ef2
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diff --git a/javascript/extractor/tests/stmts/output/trap/trivial-switch.js.trap b/javascript/extractor/tests/stmts/output/trap/trivial-switch.js.trap
new file mode 100644
index 00000000000..8d692ea07d4
--- /dev/null
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index 00000000000..753a26a8d76
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diff --git a/javascript/extractor/tests/strictmode/input/assignargs.js b/javascript/extractor/tests/strictmode/input/assignargs.js
new file mode 100644
index 00000000000..8b0d4df3b33
--- /dev/null
+++ b/javascript/extractor/tests/strictmode/input/assignargs.js
@@ -0,0 +1,4 @@
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+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/strictmode/input/tst.js b/javascript/extractor/tests/strictmode/input/tst.js
new file mode 100644
index 00000000000..8eaa84c2243
--- /dev/null
+++ b/javascript/extractor/tests/strictmode/input/tst.js
@@ -0,0 +1,2 @@
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+;
\ No newline at end of file
diff --git a/javascript/extractor/tests/strictmode/output/trap/assignargs.js.trap b/javascript/extractor/tests/strictmode/output/trap/assignargs.js.trap
new file mode 100644
index 00000000000..80e40a605cb
--- /dev/null
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new file mode 100644
index 00000000000..806a86bd29f
--- /dev/null
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diff --git a/javascript/extractor/tests/ts-full/input/tsconfig.json b/javascript/extractor/tests/ts-full/input/tsconfig.json
new file mode 100644
index 00000000000..9e26dfeeb6e
--- /dev/null
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@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/javascript/extractor/tests/ts-full/input/tst.ts b/javascript/extractor/tests/ts-full/input/tst.ts
new file mode 100644
index 00000000000..51d983eb586
--- /dev/null
+++ b/javascript/extractor/tests/ts-full/input/tst.ts
@@ -0,0 +1,15 @@
+class Class { m(); }
+interface Interface {}
+namespace Namespace {}
+enum Enum {}
+
+let class_: Class;
+let interface_: Interface;
+let namespace_: Namespace;
+let enum_: Enum;
+
+let numberArray: number[];
+
+function fun() {}
+fun();
+new Class().m();
diff --git a/javascript/extractor/tests/ts-full/output/trap/tsconfig.json.trap b/javascript/extractor/tests/ts-full/output/trap/tsconfig.json.trap
new file mode 100644
index 00000000000..1e5229e668c
--- /dev/null
+++ b/javascript/extractor/tests/ts-full/output/trap/tsconfig.json.trap
@@ -0,0 +1,3086 @@
+#10000=@"type;0"
+types(#10000,6,"Class")
+#10001=@"symbol;0"
+type_symbol(#10000,#10001)
+#10002=@"type;1"
+types(#10002,0,"any")
+#10003=@"type;2"
+types(#10003,7,"() => any")
+#10004=@"type;3"
+types(#10004,6,"Interface")
+#10005=@"symbol;2"
+type_symbol(#10004,#10005)
+#10006=@"type;4"
+types(#10006,6,"Enum")
+#10007=@"symbol;4"
+type_symbol(#10006,#10007)
+#10008=@"type;5"
+types(#10008,1,"string")
+#10009=@"type;6"
+types(#10009,2,"number")
+#10010=@"type;7"
+types(#10010,7,"(radix?: number) => string")
+#10011=@"type;8"
+types(#10011,7,"(fractionDigits?: number) => string")
+#10012=@"type;9"
+types(#10012,7,"(precision?: number) => string")
+#10013=@"type;10"
+types(#10013,7,"() => number")
+#10014=@"type;11"
+types(#10014,6,"string[]")
+#10015=@"symbol;5"
+type_symbol(#10014,#10015)
+type_child(#10008,#10014,0)
+#10016=@"type;12"
+types(#10016,3,"string | string[]")
+type_child(#10008,#10016,0)
+type_child(#10014,#10016,1)
+#10017=@"type;13"
+types(#10017,6,"NumberFormatOptions")
+#10018=@"symbol;7"
+type_symbol(#10017,#10018)
+#10019=@"type;14"
+types(#10019,7,"(locales?: string | string[], options?: NumberF...")
+#10020=@"type;15"
+types(#10020,5,"false")
+#10021=@"type;16"
+types(#10021,4,"true")
+#10022=@"type;17"
+types(#10022,3,"boolean")
+type_child(#10020,#10022,0)
+type_child(#10021,#10022,1)
+#10023=@"type;18"
+types(#10023,7,"() => boolean")
+#10024=@"type;19"
+types(#10024,7,"() => string")
+#10025=@"type;20"
+types(#10025,7,"(...strings: string[]) => string")
+#10026=@"type;21"
+types(#10026,6,"ConcatArray<string>")
+#10027=@"symbol;8"
+type_symbol(#10026,#10027)
+type_child(#10008,#10026,0)
+#10028=@"type;22"
+types(#10028,6,"ConcatArray<string>[]")
+type_symbol(#10028,#10015)
+type_child(#10026,#10028,0)
+#10029=@"type;23"
+types(#10029,3,"string | ConcatArray<string>")
+type_child(#10008,#10029,0)
+type_child(#10026,#10029,1)
+#10030=@"type;24"
+types(#10030,6,"(string | ConcatArray<string>)[]")
+type_symbol(#10030,#10015)
+type_child(#10029,#10030,0)
+#10031=@"type;25"
+types(#10031,7,"{ (...items: ConcatArray<string>[]): string[]; ...")
+#10032=@"type;26"
+types(#10032,3,"((...strings: string[]) => string) | { (...item...")
+type_child(#10025,#10032,0)
+type_child(#10031,#10032,1)
+#10033=@"type;27"
+types(#10033,7,"(searchString: string, position?: number) => nu...")
+#10034=@"type;28"
+types(#10034,7,"(start?: number, end?: number) => string")
+#10035=@"type;29"
+types(#10035,7,"(start?: number, end?: number) => string[]")
+#10036=@"type;30"
+types(#10036,3,"((start?: number, end?: number) => string) | ((...")
+type_child(#10034,#10036,0)
+type_child(#10035,#10036,1)
+#10037=@"type;31"
+types(#10037,6,"Object")
+#10038=@"symbol;9"
+type_symbol(#10037,#10038)
+#10039=@"type;32"
+types(#10039,7,"() => Object")
+#10040=@"type;33"
+types(#10040,3,"(() => string) | (() => Object)")
+type_child(#10024,#10040,0)
+type_child(#10039,#10040,1)
+#10041=@"type;34"
+types(#10041,6,"Function")
+#10042=@"symbol;10"
+type_symbol(#10041,#10042)
+#10043=@"type;35"
+types(#10043,14,"symbol")
+#10044=@"type;36"
+types(#10044,3,"string | number | symbol")
+type_child(#10008,#10044,0)
+type_child(#10009,#10044,1)
+type_child(#10043,#10044,2)
+#10045=@"type;37"
+types(#10045,7,"(v: string | number | symbol) => boolean")
+#10046=@"type;38"
+types(#10046,7,"(v: Object) => boolean")
+#10047=@"type;39"
+types(#10047,3,"((radix?: number) => string) | (() => string)")
+type_child(#10010,#10047,0)
+type_child(#10024,#10047,1)
+#10048=@"type;40"
+types(#10048,7,"() => symbol")
+#10049=@"type;41"
+types(#10049,3,"(() => number) | (() => string) | (() => symbol)")
+type_child(#10013,#10049,0)
+type_child(#10024,#10049,1)
+type_child(#10048,#10049,2)
+#10050=@"type;42"
+types(#10050,7,"(this: Function, thisArg: any, argArray?: any) ...")
+#10051=@"type;43"
+types(#10051,6,"any[]")
+type_symbol(#10051,#10015)
+type_child(#10002,#10051,0)
+#10052=@"type;44"
+types(#10052,7,"(this: Function, thisArg: any, ...argArray: any...")
+#10053=@"type;45"
+types(#10053,8,"T")
+#10054=@"symbol;11"
+type_symbol(#10053,#10054)
+#10055=@"type;46"
+types(#10055,6,"T[]")
+type_symbol(#10055,#10015)
+type_child(#10053,#10055,0)
+#10056=@"type;47"
+types(#10056,8,"T")
+#10057=@"symbol;12"
+type_symbol(#10056,#10057)
+#10058=@"type;48"
+types(#10058,6,"ConcatArray<T>")
+type_symbol(#10058,#10027)
+type_child(#10056,#10058,0)
+#10059=@"type;49"
+types(#10059,7,"(...items: any[]) => number")
+#10060=@"type;50"
+types(#10060,6,"ConcatArray<any>")
+type_symbol(#10060,#10027)
+type_child(#10002,#10060,0)
+#10061=@"type;51"
+types(#10061,6,"ConcatArray<any>[]")
+type_symbol(#10061,#10015)
+type_child(#10060,#10061,0)
+#10062=@"type;52"
+types(#10062,7,"{ (...items: ConcatArray<any>[]): any[]; (...it...")
+#10063=@"type;53"
+types(#10063,7,"(separator?: string) => string")
+#10064=@"type;54"
+types(#10064,7,"() => any[]")
+#10065=@"type;55"
+types(#10065,7,"(start?: number, end?: number) => any[]")
+#10066=@"type;56"
+types(#10066,7,"(a: any, b: any) => number")
+#10067=@"type;57"
+types(#10067,7,"(compareFn?: (a: any, b: any) => number) => any[]")
+#10068=@"type;58"
+types(#10068,7,"{ (start: number, deleteCount?: number): any[];...")
+#10069=@"type;59"
+types(#10069,7,"(searchElement: any, fromIndex?: number) => number")
+#10070=@"type;60"
+types(#10070,7,"(value: any, index: number, array: any[]) => bo...")
+#10071=@"type;61"
+types(#10071,7,"(callbackfn: (value: any, index: number, array:...")
+#10072=@"type;62"
+types(#10072,10,"void")
+#10073=@"type;63"
+types(#10073,7,"(value: any, index: number, array: any[]) => void")
+#10074=@"type;64"
+types(#10074,7,"(callbackfn: (value: any, index: number, array:...")
+#10075=@"type;65"
+types(#10075,19,"U")
+#10076=@"type;66"
+types(#10076,6,"U[]")
+type_symbol(#10076,#10015)
+type_child(#10075,#10076,0)
+#10077=@"type;67"
+types(#10077,7,"(value: any, index: number, array: any[]) => U")
+#10078=@"type;68"
+types(#10078,7,"<U>(callbackfn: (value: any, index: number, arr...")
+#10079=@"type;69"
+types(#10079,19,"S")
+#10080=@"type;70"
+types(#10080,6,"S[]")
+type_symbol(#10080,#10015)
+type_child(#10079,#10080,0)
+#10081=@"type;71"
+types(#10081,7,"(value: any, index: number, array: any[]) => any")
+#10082=@"type;72"
+types(#10082,7,"{ <S extends any>(callbackfn: (value: any, inde...")
+#10083=@"type;73"
+types(#10083,7,"(previousValue: any, currentValue: any, current...")
+#10084=@"type;74"
+types(#10084,7,"(previousValue: U, currentValue: any, currentIn...")
+#10085=@"type;75"
+types(#10085,7,"{ (callbackfn: (previousValue: any, currentValu...")
+#10086=@"type;76"
+types(#10086,6,"T[]")
+type_symbol(#10086,#10015)
+type_child(#10056,#10086,0)
+#10087=@"type;77"
+types(#10087,7,"(start?: number, end?: number) => T[]")
+#10088=@"type;78"
+types(#10088,7,"() => T")
+#10089=@"type;79"
+types(#10089,7,"(...items: T[]) => number")
+#10090=@"type;80"
+types(#10090,6,"ConcatArray<T>")
+type_symbol(#10090,#10027)
+type_child(#10053,#10090,0)
+#10091=@"type;81"
+types(#10091,6,"ConcatArray<T>[]")
+type_symbol(#10091,#10015)
+type_child(#10090,#10091,0)
+#10092=@"type;82"
+types(#10092,3,"T | ConcatArray<T>")
+type_child(#10053,#10092,0)
+type_child(#10090,#10092,1)
+#10093=@"type;83"
+types(#10093,6,"(T | ConcatArray<T>)[]")
+type_symbol(#10093,#10015)
+type_child(#10092,#10093,0)
+#10094=@"type;84"
+types(#10094,7,"{ (...items: ConcatArray<T>[]): T[]; (...items:...")
+#10095=@"type;85"
+types(#10095,7,"() => T[]")
+#10096=@"type;86"
+types(#10096,7,"(start?: number, end?: number) => T[]")
+#10097=@"type;87"
+types(#10097,7,"(a: T, b: T) => number")
+#10098=@"type;88"
+types(#10098,7,"(compareFn?: (a: T, b: T) => number) => T[]")
+#10099=@"type;89"
+types(#10099,7,"{ (start: number, deleteCount?: number): T[]; (...")
+#10100=@"type;90"
+types(#10100,7,"(searchElement: T, fromIndex?: number) => number")
+#10101=@"type;91"
+types(#10101,7,"(value: T, index: number, array: T[]) => boolean")
+#10102=@"type;92"
+types(#10102,7,"(callbackfn: (value: T, index: number, array: T...")
+#10103=@"type;93"
+types(#10103,7,"(value: T, index: number, array: T[]) => void")
+#10104=@"type;94"
+types(#10104,7,"(callbackfn: (value: T, index: number, array: T...")
+#10105=@"type;95"
+types(#10105,7,"(value: T, index: number, array: T[]) => U")
+#10106=@"type;96"
+types(#10106,7,"<U>(callbackfn: (value: T, index: number, array...")
+#10107=@"type;97"
+types(#10107,7,"(value: T, index: number, array: T[]) => any")
+#10108=@"type;98"
+types(#10108,7,"{ <S extends T>(callbackfn: (value: T, index: n...")
+#10109=@"type;99"
+types(#10109,7,"(previousValue: T, currentValue: T, currentInde...")
+#10110=@"type;100"
+types(#10110,7,"(previousValue: U, currentValue: T, currentInde...")
+#10111=@"type;101"
+types(#10111,7,"{ (callbackfn: (previousValue: T, currentValue:...")
+#10112=@"type;102"
+types(#10112,7,"() => string | ConcatArray<string>")
+#10113=@"type;103"
+types(#10113,7,"(...items: (string | ConcatArray<string>)[]) =>...")
+#10114=@"type;104"
+types(#10114,6,"ConcatArray<string | ConcatArray<string>>")
+type_symbol(#10114,#10027)
+type_child(#10029,#10114,0)
+#10115=@"type;105"
+types(#10115,6,"ConcatArray<string | ConcatArray<string>>[]")
+type_symbol(#10115,#10015)
+type_child(#10114,#10115,0)
+#10116=@"type;106"
+types(#10116,3,"string | ConcatArray<string> | ConcatArray<stri...")
+type_child(#10008,#10116,0)
+type_child(#10026,#10116,1)
+type_child(#10114,#10116,2)
+#10117=@"type;107"
+types(#10117,6,"(string | ConcatArray<string> | ConcatArray<str...")
+type_symbol(#10117,#10015)
+type_child(#10116,#10117,0)
+#10118=@"type;108"
+types(#10118,7,"{ (...items: ConcatArray<string | ConcatArray<s...")
+#10119=@"type;109"
+types(#10119,7,"() => (string | ConcatArray<string>)[]")
+#10120=@"type;110"
+types(#10120,7,"(start?: number, end?: number) => (string | Con...")
+#10121=@"type;111"
+types(#10121,7,"(a: string | ConcatArray<string>, b: string | C...")
+#10122=@"type;112"
+types(#10122,7,"(compareFn?: (a: string | ConcatArray<string>, ...")
+#10123=@"type;113"
+types(#10123,7,"{ (start: number, deleteCount?: number): (strin...")
+#10124=@"type;114"
+types(#10124,7,"(searchElement: string | ConcatArray<string>, f...")
+#10125=@"type;115"
+types(#10125,7,"(value: string | ConcatArray<string>, index: nu...")
+#10126=@"type;116"
+types(#10126,7,"(callbackfn: (value: string | ConcatArray<strin...")
+#10127=@"type;117"
+types(#10127,7,"(value: string | ConcatArray<string>, index: nu...")
+#10128=@"type;118"
+types(#10128,7,"(callbackfn: (value: string | ConcatArray<strin...")
+#10129=@"type;119"
+types(#10129,7,"(value: string | ConcatArray<string>, index: nu...")
+#10130=@"type;120"
+types(#10130,7,"<U>(callbackfn: (value: string | ConcatArray<st...")
+#10131=@"type;121"
+types(#10131,7,"(value: string | ConcatArray<string>, index: nu...")
+#10132=@"type;122"
+types(#10132,7,"{ <S extends string | ConcatArray<string>>(call...")
+#10133=@"type;123"
+types(#10133,7,"(previousValue: string | ConcatArray<string>, c...")
+#10134=@"type;124"
+types(#10134,7,"(previousValue: U, currentValue: string | Conca...")
+#10135=@"type;125"
+types(#10135,7,"{ (callbackfn: (previousValue: string | ConcatA...")
+#10136=@"type;126"
+types(#10136,3,"((start?: number, end?: number) => string) | ((...")
+type_child(#10034,#10136,0)
+type_child(#10035,#10136,1)
+type_child(#10120,#10136,2)
+#10137=@"type;127"
+types(#10137,3,"string | (string | ConcatArray<string>)[]")
+type_child(#10008,#10137,0)
+type_child(#10030,#10137,1)
+#10138=@"type;128"
+types(#10138,3,"((...strings: string[]) => string) | { (...item...")
+type_child(#10025,#10138,0)
+type_child(#10118,#10138,1)
+#10139=@"type;129"
+types(#10139,3,"((searchString: string, position?: number) => n...")
+type_child(#10033,#10139,0)
+type_child(#10124,#10139,1)
+#10140=@"type;130"
+types(#10140,3,"((start?: number, end?: number) => string) | ((...")
+type_child(#10034,#10140,0)
+type_child(#10120,#10140,1)
+#10141=@"type;131"
+types(#10141,7,"() => ConcatArray<string>")
+#10142=@"type;132"
+types(#10142,7,"(...items: ConcatArray<string>[]) => number")
+#10143=@"type;133"
+types(#10143,6,"ConcatArray<ConcatArray<string>>")
+type_symbol(#10143,#10027)
+type_child(#10026,#10143,0)
+#10144=@"type;134"
+types(#10144,6,"ConcatArray<ConcatArray<string>>[]")
+type_symbol(#10144,#10015)
+type_child(#10143,#10144,0)
+#10145=@"type;135"
+types(#10145,3,"ConcatArray<string> | ConcatArray<ConcatArray<s...")
+type_child(#10026,#10145,0)
+type_child(#10143,#10145,1)
+#10146=@"type;136"
+types(#10146,6,"(ConcatArray<string> | ConcatArray<ConcatArray<...")
+type_symbol(#10146,#10015)
+type_child(#10145,#10146,0)
+#10147=@"type;137"
+types(#10147,7,"{ (...items: ConcatArray<ConcatArray<string>>[]...")
+#10148=@"type;138"
+types(#10148,7,"() => ConcatArray<string>[]")
+#10149=@"type;139"
+types(#10149,7,"(start?: number, end?: number) => ConcatArray<s...")
+#10150=@"type;140"
+types(#10150,7,"(a: ConcatArray<string>, b: ConcatArray<string>...")
+#10151=@"type;141"
+types(#10151,7,"(compareFn?: (a: ConcatArray<string>, b: Concat...")
+#10152=@"type;142"
+types(#10152,7,"{ (start: number, deleteCount?: number): Concat...")
+#10153=@"type;143"
+types(#10153,7,"(searchElement: ConcatArray<string>, fromIndex?...")
+#10154=@"type;144"
+types(#10154,7,"(value: ConcatArray<string>, index: number, arr...")
+#10155=@"type;145"
+types(#10155,7,"(callbackfn: (value: ConcatArray<string>, index...")
+#10156=@"type;146"
+types(#10156,7,"(value: ConcatArray<string>, index: number, arr...")
+#10157=@"type;147"
+types(#10157,7,"(callbackfn: (value: ConcatArray<string>, index...")
+#10158=@"type;148"
+types(#10158,7,"(value: ConcatArray<string>, index: number, arr...")
+#10159=@"type;149"
+types(#10159,7,"<U>(callbackfn: (value: ConcatArray<string>, in...")
+#10160=@"type;150"
+types(#10160,7,"(value: ConcatArray<string>, index: number, arr...")
+#10161=@"type;151"
+types(#10161,7,"{ <S extends ConcatArray<string>>(callbackfn: (...")
+#10162=@"type;152"
+types(#10162,7,"(previousValue: ConcatArray<string>, currentVal...")
+#10163=@"type;153"
+types(#10163,7,"(previousValue: U, currentValue: ConcatArray<st...")
+#10164=@"type;154"
+types(#10164,7,"{ (callbackfn: (previousValue: ConcatArray<stri...")
+#10165=@"type;155"
+types(#10165,3,"((start?: number, end?: number) => string[]) | ...")
+type_child(#10035,#10165,0)
+type_child(#10149,#10165,1)
+#10166=@"type;156"
+types(#10166,3,"string[] | ConcatArray<string>[]")
+type_child(#10014,#10166,0)
+type_child(#10028,#10166,1)
+#10167=@"type;157"
+types(#10167,3,"(() => string) | (() => ConcatArray<string>)")
+type_child(#10024,#10167,0)
+type_child(#10141,#10167,1)
+#10168=@"type;158"
+types(#10168,7,"(...items: string[]) => number")
+#10169=@"type;159"
+types(#10169,3,"((...items: ConcatArray<string>[]) => number) |...")
+type_child(#10142,#10169,0)
+type_child(#10168,#10169,1)
+#10170=@"type;160"
+types(#10170,3,"{ (...items: ConcatArray<string>[]): string[]; ...")
+type_child(#10031,#10170,0)
+type_child(#10147,#10170,1)
+#10171=@"type;161"
+types(#10171,7,"() => string[]")
+#10172=@"type;162"
+types(#10172,3,"(() => ConcatArray<string>[]) | (() => string[])")
+type_child(#10148,#10172,0)
+type_child(#10171,#10172,1)
+#10173=@"type;163"
+types(#10173,3,"(() => ConcatArray<string>) | (() => string)")
+type_child(#10141,#10173,0)
+type_child(#10024,#10173,1)
+#10174=@"type;164"
+types(#10174,7,"(a: string, b: string) => number")
+#10175=@"type;165"
+types(#10175,7,"(compareFn?: (a: string, b: string) => number) ...")
+#10176=@"type;166"
+types(#10176,3,"((compareFn?: (a: ConcatArray<string>, b: Conca...")
+type_child(#10151,#10176,0)
+type_child(#10175,#10176,1)
+#10177=@"type;167"
+types(#10177,7,"{ (start: number, deleteCount?: number): string...")
+#10178=@"type;168"
+types(#10178,3,"{ (start: number, deleteCount?: number): Concat...")
+type_child(#10152,#10178,0)
+type_child(#10177,#10178,1)
+#10179=@"type;169"
+types(#10179,7,"(searchElement: string, fromIndex?: number) => ...")
+#10180=@"type;170"
+types(#10180,3,"((searchElement: string, fromIndex?: number) =>...")
+type_child(#10179,#10180,0)
+type_child(#10153,#10180,1)
+#10181=@"type;171"
+types(#10181,7,"(value: string, index: number, array: string[])...")
+#10182=@"type;172"
+types(#10182,7,"(callbackfn: (value: string, index: number, arr...")
+#10183=@"type;173"
+types(#10183,3,"((callbackfn: (value: ConcatArray<string>, inde...")
+type_child(#10155,#10183,0)
+type_child(#10182,#10183,1)
+#10184=@"type;174"
+types(#10184,7,"(value: string, index: number, array: string[])...")
+#10185=@"type;175"
+types(#10185,7,"(callbackfn: (value: string, index: number, arr...")
+#10186=@"type;176"
+types(#10186,3,"((callbackfn: (value: ConcatArray<string>, inde...")
+type_child(#10157,#10186,0)
+type_child(#10185,#10186,1)
+#10187=@"type;177"
+types(#10187,7,"(value: string, index: number, array: string[])...")
+#10188=@"type;178"
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diff --git a/javascript/extractor/tests/ts-full/output/trap/tst.ts.trap b/javascript/extractor/tests/ts-full/output/trap/tst.ts.trap
new file mode 100644
index 00000000000..d3de2efe8b4
--- /dev/null
+++ b/javascript/extractor/tests/ts-full/output/trap/tst.ts.trap
@@ -0,0 +1,917 @@
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+decl(#20018,#20005)
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+enclosingStmt(#20027,#20016)
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+scopes(#20028,1)
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+isArgumentsObject(#20029)
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+isArgumentsObject(#20036)
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diff --git a/javascript/extractor/tests/ts/input/arrayBindingPattern.ts b/javascript/extractor/tests/ts/input/arrayBindingPattern.ts
new file mode 100644
index 00000000000..8fe59a7a891
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/arrayBindingPattern.ts
@@ -0,0 +1 @@
+let [x,y] = [1,2]
diff --git a/javascript/extractor/tests/ts/input/badimport.ts b/javascript/extractor/tests/ts/input/badimport.ts
new file mode 100644
index 00000000000..da32b145b1f
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/badimport.ts
@@ -0,0 +1 @@
+import n = 5;
diff --git a/javascript/extractor/tests/ts/input/bindingpattern.ts b/javascript/extractor/tests/ts/input/bindingpattern.ts
new file mode 100644
index 00000000000..49345ff496e
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/bindingpattern.ts
@@ -0,0 +1 @@
+function foo({x, y}) {}
diff --git a/javascript/extractor/tests/ts/input/bom.ts b/javascript/extractor/tests/ts/input/bom.ts
new file mode 100644
index 00000000000..68264e1ab71
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/bom.ts
@@ -0,0 +1 @@
+42
diff --git a/javascript/extractor/tests/ts/input/classes.ts b/javascript/extractor/tests/ts/input/classes.ts
new file mode 100644
index 00000000000..cb268d8e29d
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/classes.ts
@@ -0,0 +1,2 @@
+abstract class C extends D, implements E<F>
+  {}
diff --git a/javascript/extractor/tests/ts/input/comments.ts b/javascript/extractor/tests/ts/input/comments.ts
new file mode 100644
index 00000000000..b9c9ffddf1a
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/comments.ts
@@ -0,0 +1,4 @@
+// c1
+a /* b */ + c // d
+/* e */
+// f
\ No newline at end of file
diff --git a/javascript/extractor/tests/ts/input/conditionalTypes.ts b/javascript/extractor/tests/ts/input/conditionalTypes.ts
new file mode 100644
index 00000000000..07d175d1d5c
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/conditionalTypes.ts
@@ -0,0 +1,102 @@
+namespace ConditionalTypes1 {
+  type TypeName<T> =
+      T extends string ? "string" :
+      T extends number ? "number" :
+      T extends boolean ? "boolean" :
+      T extends undefined ? "undefined" :
+      T extends Function ? "function" :
+      "object";
+  
+  type T0 = TypeName<string>;  // "string"
+  type T1 = TypeName<"a">;  // "string"
+  type T2 = TypeName<true>;  // "boolean"
+  type T3 = TypeName<() => void>;  // "function"
+  type T4 = TypeName<string[]>;  // "object"
+  
+  
+  type T10 = TypeName<string | (() => void)>;  // "string" | "function"
+  type T12 = TypeName<string | string[] | undefined>;  // "string" | "object" | "undefined"
+  type T11 = TypeName<string[] | number[]>;  // "object"
+  
+  type BoxedValue<T> = { value: T };
+  type BoxedArray<T> = { array: T[] };
+  type Boxed<T> = T extends any[] ? BoxedArray<T[number]> : BoxedValue<T>;
+  
+  type T20 = Boxed<string>;  // BoxedValue<string>;
+  type T21 = Boxed<number[]>;  // BoxedArray<number>;
+  type T22 = Boxed<string | number[]>;  // BoxedValue<string> | BoxedArray<number>;
+  
+  type Diff<T, U> = T extends U ? never : T;  // Remove types from T that are assignable to U
+  type Filter<T, U> = T extends U ? T : never;  // Remove types from T that are not assignable to U
+  
+  type T30 = Diff<"a" | "b" | "c" | "d", "a" | "c" | "f">;  // "b" | "d"
+  type T31 = Filter<"a" | "b" | "c" | "d", "a" | "c" | "f">;  // "a" | "c"
+  type T32 = Diff<string | number | (() => void), Function>;  // string | number
+  type T33 = Filter<string | number | (() => void), Function>;  // () => void
+  
+  type NonNullable<T> = Diff<T, null | undefined>;  // Remove null and undefined from T
+  
+  type T34 = NonNullable<string | number | undefined>;  // string | number
+  type T35 = NonNullable<string | string[] | null | undefined>;  // string | string[]
+  
+  function f1<T>(x: T, y: NonNullable<T>) {
+      x = y;  // Ok
+  }
+  
+  function f2<T extends string | undefined>(x: T, y: NonNullable<T>) {
+      x = y;  // Ok
+      let s2: string = y;  // Ok
+  }
+  
+  type FunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? K : never }[keyof T];
+  type FunctionProperties<T> = Pick<T, FunctionPropertyNames<T>>;
+  
+  type NonFunctionPropertyNames<T> = { [K in keyof T]: T[K] extends Function ? never : K }[keyof T];
+  type NonFunctionProperties<T> = Pick<T, NonFunctionPropertyNames<T>>;
+  
+  interface Part {
+      id: number;
+      name: string;
+      subparts: Part[];
+      updatePart(newName: string): void;
+  }
+  
+  type T40 = FunctionPropertyNames<Part>;  // "updatePart"
+  type T41 = NonFunctionPropertyNames<Part>;  // "id" | "name" | "subparts"
+  type T42 = FunctionProperties<Part>;  // { updatePart(newName: string): void }
+  type T43 = NonFunctionProperties<Part>;  // { id: number, name: string, subparts: Part[] }
+  
+  type ReturnType<T> = T extends (...args: any[]) => infer R ? R : any;
+}
+
+namespace ConditionalTypes2 {
+  type Unpacked<T> =
+    T extends (infer U)[] ? U :
+    T extends (...args: any[]) => infer U ? U :
+    T extends Promise<infer U> ? U :
+    T;
+  
+  type T0 = Unpacked<string>;  // string
+  type T1 = Unpacked<string[]>;  // string
+  type T2 = Unpacked<() => string>;  // string
+  type T3 = Unpacked<Promise<string>>;  // string
+  type T4 = Unpacked<Promise<string>[]>;  // Promise<string>
+  type T5 = Unpacked<Unpacked<Promise<string>[]>>;  // string
+  
+  type Foo<T> = T extends { a: infer U, b: infer U } ? U : never;
+  type T10 = Foo<{ a: string, b: string }>;  // string
+  type T11 = Foo<{ a: string, b: number }>;  // string | number
+  
+  type Bar<T> = T extends { a: (x: infer U) => void, b: (x: infer U) => void } ? U : never;
+  type T20 = Bar<{ a: (x: string) => void, b: (x: string) => void }>;  // string
+  type T21 = Bar<{ a: (x: string) => void, b: (x: number) => void }>;  // string & number
+  
+  declare function foo(x: string): number;
+  declare function foo(x: number): string;
+  declare function foo(x: string | number): string | number;
+  type T30 = ReturnType<typeof foo>;  // string | number
+  
+  type AnyFunction = (...args: any[]) => any;
+  type ReturnType<T extends AnyFunction> = T extends (...args: any[]) => infer R ? R : any;
+}
+
diff --git a/javascript/extractor/tests/ts/input/ctordecl.ts b/javascript/extractor/tests/ts/input/ctordecl.ts
new file mode 100644
index 00000000000..ccc7aceb10e
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/ctordecl.ts
@@ -0,0 +1,5 @@
+class A {
+  y = 42;
+  constructor(x:string);
+  constructor(x:any) {}
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/ts/input/declareClass.ts b/javascript/extractor/tests/ts/input/declareClass.ts
new file mode 100644
index 00000000000..a32f6064ae9
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/declareClass.ts
@@ -0,0 +1 @@
+declare class C {}
diff --git a/javascript/extractor/tests/ts/input/decorators.ts b/javascript/extractor/tests/ts/input/decorators.ts
new file mode 100644
index 00000000000..b2523d3fafc
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/decorators.ts
@@ -0,0 +1,14 @@
+@classDecorator
+class Class {
+  @methodDecorator
+  method(): number { return this.field }
+  
+  @fieldDecorator
+  field: number;
+}
+
+@functionDecorator
+function fun() {}
+
+@classDecorator2
+export class Class2 {}
diff --git a/javascript/extractor/tests/ts/input/emptydecls.ts b/javascript/extractor/tests/ts/input/emptydecls.ts
new file mode 100644
index 00000000000..34f2287d9a0
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/emptydecls.ts
@@ -0,0 +1 @@
+var;
diff --git a/javascript/extractor/tests/ts/input/enum.ts b/javascript/extractor/tests/ts/input/enum.ts
new file mode 100644
index 00000000000..a441d412dda
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/enum.ts
@@ -0,0 +1,18 @@
+enum Color { red = 1, green, blue }
+
+declare enum DeclaredEnum { a, b }
+const enum ConstEnum { a = 1+2, b }
+declare const enum DeclaredConstEnum { a, b }
+
+function foo(x) { return x; }
+
+enum ComplexInitializer {
+  a = foo(1 + 2)
+}
+
+enum StringLiteralEnumMember {
+  "a" = 2,
+  b = a
+}
+
+var x : StringLiteralEnumMember.a = 2
diff --git a/javascript/extractor/tests/ts/input/export.ts b/javascript/extractor/tests/ts/input/export.ts
new file mode 100644
index 00000000000..9993267c748
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/export.ts
@@ -0,0 +1,5 @@
+export const foo = 42;
+
+export class C {}
+
+export default function f() {};
diff --git a/javascript/extractor/tests/ts/input/export2.ts b/javascript/extractor/tests/ts/input/export2.ts
new file mode 100644
index 00000000000..7a4e8a723a4
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/export2.ts
@@ -0,0 +1 @@
+export default 42;
diff --git a/javascript/extractor/tests/ts/input/exportasnamespace.d.ts b/javascript/extractor/tests/ts/input/exportasnamespace.d.ts
new file mode 100644
index 00000000000..ed79066ec3e
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/exportasnamespace.d.ts
@@ -0,0 +1,2 @@
+export declare function foo();
+export as namespace bar;
diff --git a/javascript/extractor/tests/ts/input/exportassign.ts b/javascript/extractor/tests/ts/input/exportassign.ts
new file mode 100644
index 00000000000..b0fde936c1a
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/exportassign.ts
@@ -0,0 +1 @@
+export = 42;
diff --git a/javascript/extractor/tests/ts/input/exprs.ts b/javascript/extractor/tests/ts/input/exprs.ts
new file mode 100644
index 00000000000..490bbe728a2
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/exprs.ts
@@ -0,0 +1,5 @@
+function f(z) {
+  let x, y;
+  x, y;
+  [x, y] = z;
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/ts/input/externalmodule.ts b/javascript/extractor/tests/ts/input/externalmodule.ts
new file mode 100644
index 00000000000..f2bccf55456
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/externalmodule.ts
@@ -0,0 +1,9 @@
+declare module "X" {
+  module M {
+    export interface I {}
+  }
+  interface M {
+    method(): M.I;
+  }
+  export = M;
+}
diff --git a/javascript/extractor/tests/ts/input/functiondecorators.ts b/javascript/extractor/tests/ts/input/functiondecorators.ts
new file mode 100644
index 00000000000..2c191f7bb3b
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/functiondecorators.ts
@@ -0,0 +1,15 @@
+declare var A : any;
+declare var B : any;
+declare var C : any;
+
+class C {
+  m1(none) {}
+  m2(@A a) {}
+  m3(@A @B ab) {}
+  
+  m4(none, @A a) {}
+  m5(none, @A @B ab) {}
+  
+  m6(@A a, @B b) {}
+  m7(@A a, @B @C bc) {}
+}
diff --git a/javascript/extractor/tests/ts/input/hello.ts b/javascript/extractor/tests/ts/input/hello.ts
new file mode 100644
index 00000000000..d61463de5d7
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/hello.ts
@@ -0,0 +1,5 @@
+function greeter(person: string) {
+    return "Hello, " + person + "!";
+}
+
+alert(greeter("world"));
diff --git a/javascript/extractor/tests/ts/input/importExport.ts b/javascript/extractor/tests/ts/input/importExport.ts
new file mode 100644
index 00000000000..8ad438ec915
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/importExport.ts
@@ -0,0 +1,3 @@
+import * as Something from 'somewhere';
+
+export import importExport = Something.thingy;
diff --git a/javascript/extractor/tests/ts/input/importassign.ts b/javascript/extractor/tests/ts/input/importassign.ts
new file mode 100644
index 00000000000..d3e5ca57bd3
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/importassign.ts
@@ -0,0 +1 @@
+import x = require("./exportassign");
diff --git a/javascript/extractor/tests/ts/input/interfaces.ts b/javascript/extractor/tests/ts/input/interfaces.ts
new file mode 100644
index 00000000000..e462a9b7b16
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/interfaces.ts
@@ -0,0 +1,11 @@
+interface MyInterface {
+  foo();
+  bar(x: number): string;
+  field: number;
+}
+
+namespace Foo {
+  export interface I {
+    bar();
+  }
+}
diff --git a/javascript/extractor/tests/ts/input/invalidModuleSpecifier.ts b/javascript/extractor/tests/ts/input/invalidModuleSpecifier.ts
new file mode 100644
index 00000000000..092489b986e
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/invalidModuleSpecifier.ts
@@ -0,0 +1 @@
+import * as x from `x`;
diff --git a/javascript/extractor/tests/ts/input/klee-binary-file.ts b/javascript/extractor/tests/ts/input/klee-binary-file.ts
new file mode 100644
index 0000000000000000000000000000000000000000..05aaa7636f63d55df8d43f04957a33dc87cb05d5
GIT binary patch
literal 1412
zcmYk*=~mT16ok<T2nY%&iVO-kiwaUI@OnHtUr|;kKkmw@v(ud()}5wldNNJ-{HB%v
zPuC(CrfV0gNE;$VT&y8&h!An{6lp_*h>LZk4G|(PHjp+%h`889+7Kb);u+G02oV=s
zNE;$VTx=t4h%k?Nz8ph{_#j>&em<TKA>w`PAY(s-S$3B~h<G1+$k-2ImX}K*L_F;)
zq|=KK@!)-=lZX)U2VW!oum}-P`v&RsB1C-p2gtYuLd4U)MLN9*^O(cs7(&F0JVLry
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zcccvwB0l2_WSli2;#2v7jME`R{K`+HuZj@yz5GJP{SYE+6qksfkN+P+#DAnKq<<(8
zA})R-ZHO?-^->5C7ed+)VU|BjAw;~CzetxP!Yu!mLWsDyLD~>umfNKeA};QbHbjU#
E01J#odH?_b

literal 0
HcmV?d00001

diff --git a/javascript/extractor/tests/ts/input/let.ts b/javascript/extractor/tests/ts/input/let.ts
new file mode 100644
index 00000000000..9943a1cab4b
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/let.ts
@@ -0,0 +1,3 @@
+var varX = 5;
+let letX = 6;
+const constX = 7;
diff --git a/javascript/extractor/tests/ts/input/mappedTypeModifiers.ts b/javascript/extractor/tests/ts/input/mappedTypeModifiers.ts
new file mode 100644
index 00000000000..69e436afdd3
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/mappedTypeModifiers.ts
@@ -0,0 +1,11 @@
+namespace MappedTypeModifiers {
+  type MutableRequired<T> = { -readonly [P in keyof T]-?: T[P] };  // Remove readonly and ?
+  type ReadonlyPartial<T> = { +readonly [P in keyof T]+?: T[P] };  // Add readonly and ?
+
+  type ReadonlyPartial2<T> = { readonly [P in keyof T]?: T[P] };  // Add readonly and ?
+
+  type Required<T> = { [P in keyof T]-?: T[P] };
+
+  type Foo = { a?: string };  // Same as { a?: string | undefined }
+  type Bar = Required<Foo>;  // Same as { a: string }
+}
diff --git a/javascript/extractor/tests/ts/input/mpeg-stream-fragment.ts b/javascript/extractor/tests/ts/input/mpeg-stream-fragment.ts
new file mode 100644
index 0000000000000000000000000000000000000000..0ac7ec758bdf65656a71788c8ff6ccdb684ad449
GIT binary patch
literal 376
zcmZ>FU@%z5@P8-(28Ip13=9Vu7#J8IDEv(N+U@S3V6bq|yPbh)gAfBF(Af_HJ}^jw
J2xrgf`v5DtQ@j8G

literal 0
HcmV?d00001

diff --git a/javascript/extractor/tests/ts/input/namespaces.ts b/javascript/extractor/tests/ts/input/namespaces.ts
new file mode 100644
index 00000000000..2f56d55e7b4
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/namespaces.ts
@@ -0,0 +1,7 @@
+namespace M {
+  export namespace N {
+    export let x = 42;
+  }
+}
+
+import x = M.N.x;
diff --git a/javascript/extractor/tests/ts/input/nestedNamespace.ts b/javascript/extractor/tests/ts/input/nestedNamespace.ts
new file mode 100644
index 00000000000..086365cef80
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/nestedNamespace.ts
@@ -0,0 +1,8 @@
+namespace A.B {}
+namespace A.B.C {}
+
+namespace X {
+  export namespace Y.Z {}
+  
+  namespace W.Q {}
+}
diff --git a/javascript/extractor/tests/ts/input/nobody.ts b/javascript/extractor/tests/ts/input/nobody.ts
new file mode 100644
index 00000000000..9d5e6a776a2
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/nobody.ts
@@ -0,0 +1,29 @@
+// Ambient functions
+declare function f();
+
+abstract class C {
+  // Abstract methods
+  abstract h();
+
+  // Overload signatures
+  g(x: number): number;
+  g(x: string): string;
+  g(x: any) {}
+
+  // Abstract fields
+  abstract x: number;
+}
+
+// Same but ambient
+declare abstract class D {
+  // Abstract methods
+  abstract h();
+
+  // Overload signatures
+  g(x: number): number;
+  g(x: string): string;
+  g(x: any) {}
+
+  // Abstract fields
+  abstract x: number;
+}
diff --git a/javascript/extractor/tests/ts/input/objectLiteralAccessor.ts b/javascript/extractor/tests/ts/input/objectLiteralAccessor.ts
new file mode 100644
index 00000000000..45e193bda66
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/objectLiteralAccessor.ts
@@ -0,0 +1,4 @@
+var x = {
+  get foo() {return 1},
+  set foo(v) {}
+}
diff --git a/javascript/extractor/tests/ts/input/omitted.ts b/javascript/extractor/tests/ts/input/omitted.ts
new file mode 100644
index 00000000000..1ce15b60dfe
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/omitted.ts
@@ -0,0 +1 @@
+[, ,1];
\ No newline at end of file
diff --git a/javascript/extractor/tests/ts/input/regexp.ts b/javascript/extractor/tests/ts/input/regexp.ts
new file mode 100644
index 00000000000..5f0e8e4849b
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/regexp.ts
@@ -0,0 +1 @@
+/a/
\ No newline at end of file
diff --git a/javascript/extractor/tests/ts/input/templates.ts b/javascript/extractor/tests/ts/input/templates.ts
new file mode 100644
index 00000000000..27a7c3ec894
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/templates.ts
@@ -0,0 +1 @@
+`url("${ctx.expected.image}")`
diff --git a/javascript/extractor/tests/ts/input/thisparameter.ts b/javascript/extractor/tests/ts/input/thisparameter.ts
new file mode 100644
index 00000000000..3dddcabcd99
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/thisparameter.ts
@@ -0,0 +1,14 @@
+function declaration(this: void, x: number) {}
+
+var f = function(this: string, x: number) {}
+
+declare function ambient(this: string, x: number);
+
+class C {
+  member(this: C) {}
+}
+
+interface I {
+  method(this: I);
+}
+
diff --git a/javascript/extractor/tests/ts/input/trust-store-file.ts b/javascript/extractor/tests/ts/input/trust-store-file.ts
new file mode 100644
index 0000000000000000000000000000000000000000..b3394237f0d31f9c1a3c0526409278561aed4d69
GIT binary patch
literal 1589
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literal 0
HcmV?d00001

diff --git a/javascript/extractor/tests/ts/input/tryfinally.ts b/javascript/extractor/tests/ts/input/tryfinally.ts
new file mode 100644
index 00000000000..fc1fdd27956
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/tryfinally.ts
@@ -0,0 +1,7 @@
+function foo() {
+  var x = 5;
+  try {
+  } finally {
+    return x;
+  }
+}
diff --git a/javascript/extractor/tests/ts/input/tsx.tsx b/javascript/extractor/tests/ts/input/tsx.tsx
new file mode 100644
index 00000000000..21bafc9c3eb
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/tsx.tsx
@@ -0,0 +1,4 @@
+<div className={ className } title={ title }>
+  <this.props.icon/>
+  <name-with-dashes/>
+</div>
diff --git a/javascript/extractor/tests/ts/input/typeannotations.ts b/javascript/extractor/tests/ts/input/typeannotations.ts
new file mode 100644
index 00000000000..83a40955c45
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/typeannotations.ts
@@ -0,0 +1,65 @@
+interface Point { x: number; y: number }
+
+namespace N {
+  export interface I {}
+  export interface J<T> {}
+}
+
+var anyVar:             any;
+var objectVar:          object;
+var numberVar:          number;
+var stringVar:          string;
+var booleanVar:         boolean;
+var nullVar:            null;
+var undefinedVar:       undefined;
+var voidVar:            void;
+var neverVar:           never;
+var symbolVar:          symbol;
+var objectVar:          { x: number; }
+var nestedObjectVar:    { x: { y: number } }
+var arrayVar:           number[]
+var stringObjectVar:    String
+var pointVar:           Point
+var rawFunctionVar:     Function
+var varVar:             x11
+var genericArrayVar:    Array<number>
+var nestedGenericVar:   Foo<Foo<number>>
+var callSigVar:         () => number;
+var constructSigVar:    new () => Point;
+var callSigVoidVar:     () => void;
+var callSigNeverVar:    () => never;
+var unionVar:           number | string;
+var stringLiteralVar:   "literal";
+var trueVar:            true;
+var falseVar:           false;
+var intLiteralVar:      100;
+var doubleLiteralVar:   100.50;
+var tupleVar:           [string, number]
+var longUnionVar:       null | 1 | "two" | [3]
+var intersectVar:       Foo & Bar;
+var genericCallSigVar:  <T>(x: T) => T;
+var genericConstructSigVar: new <T>(x: T) => T;
+var keyofVar:           keyof Point
+var indexedVar:         Point["x"]
+var typeofVar:          typeof x31
+var mappedVar:          { [K in keyof Point]: any }
+var parenthesizedVar:   (number);
+var namespaceTypeVar:   N.I;
+var namespaceGenericTypeVar: N.J<number>;
+
+interface GenericInterface<T> {
+  field: T;
+  method(x: T): T;
+}
+abstract class GenericClass<T> implements GenericInterface<T> {
+  field: T
+  abstract method(x:T): T;
+}
+
+class Fish {}
+class Bird {}
+function isFish(pet : Fish | Bird): pet is Fish {}
+
+class ThisTypes {
+  foo(x: number): this { return this; }
+}
diff --git a/javascript/extractor/tests/ts/input/unicode.ts b/javascript/extractor/tests/ts/input/unicode.ts
new file mode 100644
index 00000000000..771cef907e8
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/unicode.ts
@@ -0,0 +1,3 @@
+// Ø α
+// ࢢ 
+// �
diff --git a/javascript/extractor/tests/ts/input/unicodeId.ts b/javascript/extractor/tests/ts/input/unicodeId.ts
new file mode 100644
index 00000000000..2bca0472130
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/unicodeId.ts
@@ -0,0 +1 @@
+var �能ソЫⅨ蒤郳र�क�ड�राüışğİliيونيكودöÄüß�能ソЫⅨ蒤郳र�क�ड�राüışğİliيونيكودöÄüßAbcd123 = 1;
diff --git a/javascript/extractor/tests/ts/input/uninstantiatedNamespace.ts b/javascript/extractor/tests/ts/input/uninstantiatedNamespace.ts
new file mode 100644
index 00000000000..a8de3fd489f
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/uninstantiatedNamespace.ts
@@ -0,0 +1,25 @@
+namespace Wrapper {
+
+  namespace Empty {}
+  namespace Comments {
+    // foo
+    /* bar */
+  }
+  namespace Outer {
+    namespace Inner {}
+  }
+  namespace Outer2 {
+    export namespace Inner {}
+  }
+  namespace Interfaces {
+    interface I {
+      x: number;
+      foo(): number;
+    }
+  }
+
+  namespace EmptyStatement {;}
+  namespace EmptyBlock {{}}
+
+  var x = [Empty, Comments, Outer, Outer2, Interfaces, EmptyStatement, EmptyBlock]
+}
diff --git a/javascript/extractor/tests/ts/input/xmlfile-utf16be.ts b/javascript/extractor/tests/ts/input/xmlfile-utf16be.ts
new file mode 100644
index 0000000000000000000000000000000000000000..f5af8b3c5f1a2d86482222aa2530f46ea3782238
GIT binary patch
literal 62
zcmZRuVF+OeW>8?rVMt`iV@PKx1=8sZsSLIZN(|);89-hMkXHu8ML-cd1}+9027Ry|
GAR7Qi*$L4A

literal 0
HcmV?d00001

diff --git a/javascript/extractor/tests/ts/input/xmlfile-utf16le.ts b/javascript/extractor/tests/ts/input/xmlfile-utf16le.ts
new file mode 100644
index 0000000000000000000000000000000000000000..9b3ca0c563ff93a2a07efd485c9c4b809b6f91e1
GIT binary patch
literal 62
zcmcCv2w@0jP+-VmNMy)kNM|So(&-GT47LnP4CM?NKwb%uR|dpIKoL6zE(RM0eXt%7
F8vszL3DE!m

literal 0
HcmV?d00001

diff --git a/javascript/extractor/tests/ts/input/xmlfile.ts b/javascript/extractor/tests/ts/input/xmlfile.ts
new file mode 100644
index 00000000000..f673979bfa0
--- /dev/null
+++ b/javascript/extractor/tests/ts/input/xmlfile.ts
@@ -0,0 +1,2 @@
+<TS language="whatever">
+</TS>
diff --git a/javascript/extractor/tests/ts/options.json b/javascript/extractor/tests/ts/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/ts/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/ts/output/trap/arrayBindingPattern.ts.trap b/javascript/extractor/tests/ts/output/trap/arrayBindingPattern.ts.trap
new file mode 100644
index 00000000000..2b7fba39b8e
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/arrayBindingPattern.ts.trap
@@ -0,0 +1,163 @@
+#10000=@"/arrayBindingPattern.ts;sourcefile"
+files(#10000,"/arrayBindingPattern.ts","arrayBindingPattern","ts",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,0"
+locations_default(#20002,#10000,1,1,2,0)
+hasLocation(#20001,#20002)
+#20003=@"var;{x};{#20000}"
+variables(#20003,"x",#20000)
+#20004=@"var;{y};{#20000}"
+variables(#20004,"y",#20000)
+#20005=*
+stmts(#20005,23,#20001,0,"let [x,y] = [1,2]")
+#20006=@"loc,{#10000},1,1,1,17"
+locations_default(#20006,#10000,1,1,1,17)
+hasLocation(#20005,#20006)
+stmtContainers(#20005,#20001)
+#20007=*
+exprs(#20007,64,#20005,0,"[x,y] = [1,2]")
+#20008=@"loc,{#10000},1,5,1,17"
+locations_default(#20008,#10000,1,5,1,17)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20005)
+exprContainers(#20007,#20001)
+#20009=*
+exprs(#20009,67,#20007,0,"[x,y]")
+#20010=@"loc,{#10000},1,5,1,9"
+locations_default(#20010,#10000,1,5,1,9)
+hasLocation(#20009,#20010)
+enclosingStmt(#20009,#20005)
+exprContainers(#20009,#20001)
+#20011=*
+exprs(#20011,78,#20009,0,"x")
+#20012=@"loc,{#10000},1,6,1,6"
+locations_default(#20012,#10000,1,6,1,6)
+hasLocation(#20011,#20012)
+enclosingStmt(#20011,#20005)
+exprContainers(#20011,#20001)
+literals("x","x",#20011)
+decl(#20011,#20003)
+#20013=*
+exprs(#20013,78,#20009,1,"y")
+#20014=@"loc,{#10000},1,8,1,8"
+locations_default(#20014,#10000,1,8,1,8)
+hasLocation(#20013,#20014)
+enclosingStmt(#20013,#20005)
+exprContainers(#20013,#20001)
+literals("y","y",#20013)
+decl(#20013,#20004)
+arraySize(#20009,2)
+#20015=*
+exprs(#20015,7,#20007,1,"[1,2]")
+#20016=@"loc,{#10000},1,13,1,17"
+locations_default(#20016,#10000,1,13,1,17)
+hasLocation(#20015,#20016)
+enclosingStmt(#20015,#20005)
+exprContainers(#20015,#20001)
+#20017=*
+exprs(#20017,3,#20015,0,"1")
+#20018=@"loc,{#10000},1,14,1,14"
+locations_default(#20018,#10000,1,14,1,14)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20005)
+exprContainers(#20017,#20001)
+literals("1","1",#20017)
+#20019=*
+exprs(#20019,3,#20015,1,"2")
+#20020=@"loc,{#10000},1,16,1,16"
+locations_default(#20020,#10000,1,16,1,16)
+hasLocation(#20019,#20020)
+enclosingStmt(#20019,#20005)
+exprContainers(#20019,#20001)
+literals("2","2",#20019)
+arraySize(#20015,2)
+#20021=*
+lines(#20021,#20001,"let [x,y] = [1,2]","
+")
+hasLocation(#20021,#20006)
+numlines(#20001,1,1,0)
+#20022=*
+tokeninfo(#20022,7,#20001,0,"let")
+#20023=@"loc,{#10000},1,1,1,3"
+locations_default(#20023,#10000,1,1,1,3)
+hasLocation(#20022,#20023)
+#20024=*
+tokeninfo(#20024,8,#20001,1,"[")
+#20025=@"loc,{#10000},1,5,1,5"
+locations_default(#20025,#10000,1,5,1,5)
+hasLocation(#20024,#20025)
+#20026=*
+tokeninfo(#20026,6,#20001,2,"x")
+hasLocation(#20026,#20012)
+#20027=*
+tokeninfo(#20027,8,#20001,3,",")
+#20028=@"loc,{#10000},1,7,1,7"
+locations_default(#20028,#10000,1,7,1,7)
+hasLocation(#20027,#20028)
+#20029=*
+tokeninfo(#20029,6,#20001,4,"y")
+hasLocation(#20029,#20014)
+#20030=*
+tokeninfo(#20030,8,#20001,5,"]")
+#20031=@"loc,{#10000},1,9,1,9"
+locations_default(#20031,#10000,1,9,1,9)
+hasLocation(#20030,#20031)
+#20032=*
+tokeninfo(#20032,8,#20001,6,"=")
+#20033=@"loc,{#10000},1,11,1,11"
+locations_default(#20033,#10000,1,11,1,11)
+hasLocation(#20032,#20033)
+#20034=*
+tokeninfo(#20034,8,#20001,7,"[")
+#20035=@"loc,{#10000},1,13,1,13"
+locations_default(#20035,#10000,1,13,1,13)
+hasLocation(#20034,#20035)
+#20036=*
+tokeninfo(#20036,3,#20001,8,"1")
+hasLocation(#20036,#20018)
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diff --git a/javascript/extractor/tests/ts/output/trap/badimport.ts.trap b/javascript/extractor/tests/ts/output/trap/badimport.ts.trap
new file mode 100644
index 00000000000..59e82686b6e
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/badimport.ts.trap
@@ -0,0 +1,30 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/bindingpattern.ts.trap b/javascript/extractor/tests/ts/output/trap/bindingpattern.ts.trap
new file mode 100644
index 00000000000..1ec2efaa8a0
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/bindingpattern.ts.trap
@@ -0,0 +1,176 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/bom.ts.trap b/javascript/extractor/tests/ts/output/trap/bom.ts.trap
new file mode 100644
index 00000000000..055df232847
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/bom.ts.trap
@@ -0,0 +1,53 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/classes.ts.trap b/javascript/extractor/tests/ts/output/trap/classes.ts.trap
new file mode 100644
index 00000000000..a9c8742782f
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/classes.ts.trap
@@ -0,0 +1,245 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/comments.ts.trap b/javascript/extractor/tests/ts/output/trap/comments.ts.trap
new file mode 100644
index 00000000000..d544a077e82
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/comments.ts.trap
@@ -0,0 +1,126 @@
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+")
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+")
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+")
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diff --git a/javascript/extractor/tests/ts/output/trap/conditionalTypes.ts.trap b/javascript/extractor/tests/ts/output/trap/conditionalTypes.ts.trap
new file mode 100644
index 00000000000..be1b834003d
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/conditionalTypes.ts.trap
@@ -0,0 +1,10205 @@
+#10000=@"/conditionalTypes.ts;sourcefile"
+files(#10000,"/conditionalTypes.ts","conditionalTypes","ts",0)
+#10001=@"/;folder"
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+#20005=@"local_namespace_name;{ConditionalTypes1};{#20000}"
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index 00000000000..65613631b9e
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new file mode 100644
index 00000000000..c350394cdeb
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diff --git a/javascript/extractor/tests/ts/output/trap/emptydecls.ts.trap b/javascript/extractor/tests/ts/output/trap/emptydecls.ts.trap
new file mode 100644
index 00000000000..8ebf40c9f25
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/emptydecls.ts.trap
@@ -0,0 +1,30 @@
+#10000=@"/emptydecls.ts;sourcefile"
+files(#10000,"/emptydecls.ts","emptydecls","ts",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
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+#20000=@"global_scope"
+scopes(#20000,0)
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+#20002=@"loc,{#10000},1,1,1,1"
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+")
+#20004=@"loc,{#10000},1,4,1,4"
+locations_default(#20004,#10000,1,4,1,4)
+hasLocation(#20003,#20004)
+#20005=*
+lines(#20005,#20001,"var;","
+")
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+hasLocation(#20005,#20006)
+numlines(#20001,1,0,0)
+numlines(#10000,1,0,0)
+filetype(#10000,"typescript")
diff --git a/javascript/extractor/tests/ts/output/trap/enum.ts.trap b/javascript/extractor/tests/ts/output/trap/enum.ts.trap
new file mode 100644
index 00000000000..b1581bf4172
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/enum.ts.trap
@@ -0,0 +1,1112 @@
+#10000=@"/enum.ts;sourcefile"
+files(#10000,"/enum.ts","enum","ts",0)
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+folders(#10001,"/","")
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+variables(#20010,"StringLiteralEnumMember",#20000)
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+local_type_names(#20011,"Color",#20000)
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+local_type_names(#20012,"DeclaredEnum",#20000)
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diff --git a/javascript/extractor/tests/ts/output/trap/export.ts.trap b/javascript/extractor/tests/ts/output/trap/export.ts.trap
new file mode 100644
index 00000000000..3a09f8959a9
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/export.ts.trap
@@ -0,0 +1,327 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/export2.ts.trap b/javascript/extractor/tests/ts/output/trap/export2.ts.trap
new file mode 100644
index 00000000000..cf91787cd6c
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/export2.ts.trap
@@ -0,0 +1,75 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/exportasnamespace.d.ts.trap b/javascript/extractor/tests/ts/output/trap/exportasnamespace.d.ts.trap
new file mode 100644
index 00000000000..59b9c422840
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/exportasnamespace.d.ts.trap
@@ -0,0 +1,149 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/exportassign.ts.trap b/javascript/extractor/tests/ts/output/trap/exportassign.ts.trap
new file mode 100644
index 00000000000..0bd00d25127
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/exportassign.ts.trap
@@ -0,0 +1,75 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/exprs.ts.trap b/javascript/extractor/tests/ts/output/trap/exprs.ts.trap
new file mode 100644
index 00000000000..7ebb546ca4d
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/exprs.ts.trap
@@ -0,0 +1,349 @@
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+#20369=*
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+#20370=@"loc,{#10000},14,23,14,23"
+locations_default(#20370,#10000,14,23,14,23)
+hasLocation(#20369,#20370)
+#20371=*
+tokeninfo(#20371,8,#20001,93,"}")
+hasLocation(#20371,#20220)
+#20372=*
+tokeninfo(#20372,0,#20001,94,"")
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+locations_default(#20373,#10000,16,1,16,0)
+hasLocation(#20372,#20373)
+#20374=*
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+#20375=@"loc,{#10000},1,1,1,0"
+locations_default(#20375,#10000,1,1,1,0)
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+#20376=*
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+hasLocation(#20376,#20373)
+successor(#20190,#20187)
+#20377=*
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+hasLocation(#20377,#20188)
+#20378=*
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+hasLocation(#20378,#20188)
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+successor(#20189,#20190)
+successor(#20187,#20031)
+successor(#20161,#20157)
+#20379=*
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+#20380=@"loc,{#10000},14,3,14,2"
+locations_default(#20380,#10000,14,3,14,2)
+hasLocation(#20379,#20380)
+#20381=*
+exit_cfg_node(#20381,#20161)
+#20382=@"loc,{#10000},14,24,14,23"
+locations_default(#20382,#10000,14,24,14,23)
+hasLocation(#20381,#20382)
+successor(#20185,#20381)
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+successor(#20164,#20167)
+successor(#20379,#20164)
+successor(#20159,#20161)
+successor(#20157,#20189)
+successor(#20136,#20132)
+#20383=*
+entry_cfg_node(#20383,#20136)
+#20384=@"loc,{#10000},13,3,13,2"
+locations_default(#20384,#10000,13,3,13,2)
+hasLocation(#20383,#20384)
+#20385=*
+exit_cfg_node(#20385,#20136)
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+locations_default(#20386,#10000,13,20,13,19)
+hasLocation(#20385,#20386)
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+locations_default(#20388,#10000,11,3,11,2)
+hasLocation(#20387,#20388)
+#20389=*
+exit_cfg_node(#20389,#20111)
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+hasLocation(#20389,#20390)
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+successor(#20387,#20114)
+successor(#20109,#20111)
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+successor(#20091,#20087)
+#20391=*
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+#20392=@"loc,{#10000},10,3,10,2"
+locations_default(#20392,#10000,10,3,10,2)
+hasLocation(#20391,#20392)
+#20393=*
+exit_cfg_node(#20393,#20091)
+#20394=@"loc,{#10000},10,20,10,19"
+locations_default(#20394,#10000,10,20,10,19)
+hasLocation(#20393,#20394)
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+successor(#20097,#20105)
+successor(#20094,#20097)
+successor(#20391,#20094)
+successor(#20089,#20091)
+successor(#20087,#20109)
+successor(#20069,#20065)
+#20395=*
+entry_cfg_node(#20395,#20069)
+#20396=@"loc,{#10000},8,3,8,2"
+locations_default(#20396,#10000,8,3,8,2)
+hasLocation(#20395,#20396)
+#20397=*
+exit_cfg_node(#20397,#20069)
+#20398=@"loc,{#10000},8,18,8,17"
+locations_default(#20398,#10000,8,18,8,17)
+hasLocation(#20397,#20398)
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+successor(#20395,#20072)
+successor(#20067,#20069)
+successor(#20065,#20089)
+successor(#20052,#20048)
+#20399=*
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+#20400=@"loc,{#10000},7,3,7,2"
+locations_default(#20400,#10000,7,3,7,2)
+hasLocation(#20399,#20400)
+#20401=*
+exit_cfg_node(#20401,#20052)
+#20402=@"loc,{#10000},7,14,7,13"
+locations_default(#20402,#10000,7,14,7,13)
+hasLocation(#20401,#20402)
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+successor(#20050,#20052)
+successor(#20048,#20067)
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+#20403=*
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+#20404=@"loc,{#10000},6,3,6,2"
+locations_default(#20404,#10000,6,3,6,2)
+hasLocation(#20403,#20404)
+#20405=*
+exit_cfg_node(#20405,#20040)
+#20406=@"loc,{#10000},6,14,6,13"
+locations_default(#20406,#10000,6,14,6,13)
+hasLocation(#20405,#20406)
+successor(#20046,#20405)
+successor(#20043,#20046)
+successor(#20403,#20043)
+successor(#20038,#20040)
+successor(#20036,#20050)
+successor(#20033,#20038)
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+successor(#20181,#20175)
+successor(#20179,#20177)
+successor(#20177,#20183)
+successor(#20175,#20376)
+successor(#20173,#20172)
+successor(#20172,#20170)
+successor(#20170,#20179)
+successor(#20153,#20152)
+successor(#20152,#20150)
+successor(#20150,#20173)
+successor(#20148,#20147)
+successor(#20147,#20145)
+successor(#20145,#20153)
+successor(#20128,#20126)
+successor(#20126,#20120)
+successor(#20124,#20122)
+successor(#20122,#20128)
+successor(#20120,#20148)
+successor(#20103,#20102)
+successor(#20102,#20100)
+successor(#20100,#20124)
+successor(#20083,#20081)
+successor(#20081,#20075)
+successor(#20079,#20077)
+successor(#20077,#20083)
+successor(#20075,#20103)
+successor(#20061,#20060)
+successor(#20060,#20058)
+successor(#20058,#20079)
+successor(#20031,#20061)
+successor(#20023,#20033)
+successor(#20014,#20023)
+successor(#20005,#20014)
+successor(#20374,#20005)
+numlines(#10000,15,12,0)
+filetype(#10000,"typescript")
diff --git a/javascript/extractor/tests/ts/output/trap/hello.ts.trap b/javascript/extractor/tests/ts/output/trap/hello.ts.trap
new file mode 100644
index 00000000000..73b76774111
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/hello.ts.trap
@@ -0,0 +1,326 @@
+#10000=@"/hello.ts;sourcefile"
+files(#10000,"/hello.ts","hello","ts",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,6,0"
+locations_default(#20002,#10000,1,1,6,0)
+hasLocation(#20001,#20002)
+#20003=@"var;{greeter};{#20000}"
+variables(#20003,"greeter",#20000)
+#20004=*
+stmts(#20004,17,#20001,0,"functio ...  ""!"";\n}")
+#20005=@"loc,{#10000},1,1,3,1"
+locations_default(#20005,#10000,1,1,3,1)
+hasLocation(#20004,#20005)
+stmtContainers(#20004,#20001)
+#20006=*
+exprs(#20006,78,#20004,-1,"greeter")
+#20007=@"loc,{#10000},1,10,1,16"
+locations_default(#20007,#10000,1,10,1,16)
+hasLocation(#20006,#20007)
+exprContainers(#20006,#20004)
+literals("greeter","greeter",#20006)
+decl(#20006,#20003)
+#20008=*
+scopes(#20008,1)
+scopenodes(#20004,#20008)
+scopenesting(#20008,#20000)
+#20009=@"var;{person};{#20008}"
+variables(#20009,"person",#20008)
+#20010=*
+exprs(#20010,78,#20004,0,"person")
+#20011=@"loc,{#10000},1,18,1,23"
+locations_default(#20011,#10000,1,18,1,23)
+hasLocation(#20010,#20011)
+exprContainers(#20010,#20004)
+literals("person","person",#20010)
+decl(#20010,#20009)
+#20012=@"var;{arguments};{#20008}"
+variables(#20012,"arguments",#20008)
+isArgumentsObject(#20012)
+#20013=*
+typeexprs(#20013,2,#20004,-6,"string")
+#20014=@"loc,{#10000},1,26,1,31"
+locations_default(#20014,#10000,1,26,1,31)
+hasLocation(#20013,#20014)
+exprContainers(#20013,#20004)
+literals("string","string",#20013)
+#20015=*
+stmts(#20015,1,#20004,-2,"{\n    r ...  ""!"";\n}")
+#20016=@"loc,{#10000},1,34,3,1"
+locations_default(#20016,#10000,1,34,3,1)
+hasLocation(#20015,#20016)
+stmtContainers(#20015,#20004)
+#20017=*
+stmts(#20017,9,#20015,0,"return  ...  + ""!"";")
+#20018=@"loc,{#10000},2,5,2,36"
+locations_default(#20018,#10000,2,5,2,36)
+hasLocation(#20017,#20018)
+stmtContainers(#20017,#20004)
+#20019=*
+exprs(#20019,34,#20017,0,"""Hello, ... n + ""!""")
+#20020=@"loc,{#10000},2,12,2,35"
+locations_default(#20020,#10000,2,12,2,35)
+hasLocation(#20019,#20020)
+enclosingStmt(#20019,#20017)
+exprContainers(#20019,#20004)
+#20021=*
+exprs(#20021,34,#20019,0,"""Hello, "" + person")
+#20022=@"loc,{#10000},2,12,2,29"
+locations_default(#20022,#10000,2,12,2,29)
+hasLocation(#20021,#20022)
+enclosingStmt(#20021,#20017)
+exprContainers(#20021,#20004)
+#20023=*
+exprs(#20023,4,#20021,0,"""Hello, """)
+#20024=@"loc,{#10000},2,12,2,20"
+locations_default(#20024,#10000,2,12,2,20)
+hasLocation(#20023,#20024)
+enclosingStmt(#20023,#20017)
+exprContainers(#20023,#20004)
+literals("Hello, ","""Hello, """,#20023)
+#20025=*
+exprs(#20025,79,#20021,1,"person")
+#20026=@"loc,{#10000},2,24,2,29"
+locations_default(#20026,#10000,2,24,2,29)
+hasLocation(#20025,#20026)
+enclosingStmt(#20025,#20017)
+exprContainers(#20025,#20004)
+literals("person","person",#20025)
+bind(#20025,#20009)
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+exprs(#20027,4,#20019,1,"""!""")
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+hasLocation(#20027,#20028)
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+literals("!","""!""",#20027)
+numlines(#20004,3,3,0)
+#20029=*
+stmts(#20029,2,#20001,1,"alert(g ... rld""));")
+#20030=@"loc,{#10000},5,1,5,24"
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+stmtContainers(#20029,#20001)
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+exprs(#20031,13,#20029,0,"alert(g ... orld""))")
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+locations_default(#20032,#10000,5,1,5,23)
+hasLocation(#20031,#20032)
+enclosingStmt(#20031,#20029)
+exprContainers(#20031,#20001)
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+exprs(#20033,79,#20031,-1,"alert")
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+locations_default(#20034,#10000,5,1,5,5)
+hasLocation(#20033,#20034)
+enclosingStmt(#20033,#20029)
+exprContainers(#20033,#20001)
+literals("alert","alert",#20033)
+#20035=@"var;{alert};{#20000}"
+variables(#20035,"alert",#20000)
+bind(#20033,#20035)
+#20036=*
+exprs(#20036,13,#20031,0,"greeter(""world"")")
+#20037=@"loc,{#10000},5,7,5,22"
+locations_default(#20037,#10000,5,7,5,22)
+hasLocation(#20036,#20037)
+enclosingStmt(#20036,#20029)
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+locations_default(#20039,#10000,5,7,5,13)
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+enclosingStmt(#20038,#20029)
+exprContainers(#20038,#20001)
+literals("greeter","greeter",#20038)
+bind(#20038,#20003)
+#20040=*
+exprs(#20040,4,#20036,0,"""world""")
+#20041=@"loc,{#10000},5,15,5,21"
+locations_default(#20041,#10000,5,15,5,21)
+hasLocation(#20040,#20041)
+enclosingStmt(#20040,#20029)
+exprContainers(#20040,#20001)
+literals("world","""world""",#20040)
+#20042=*
+lines(#20042,#20001,"function greeter(person: string) {","
+")
+#20043=@"loc,{#10000},1,1,1,34"
+locations_default(#20043,#10000,1,1,1,34)
+hasLocation(#20042,#20043)
+#20044=*
+lines(#20044,#20001,"    return ""Hello, "" + person + ""!"";","
+")
+#20045=@"loc,{#10000},2,1,2,36"
+locations_default(#20045,#10000,2,1,2,36)
+hasLocation(#20044,#20045)
+indentation(#10000,2," ",4)
+#20046=*
+lines(#20046,#20001,"}","
+")
+#20047=@"loc,{#10000},3,1,3,1"
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+hasLocation(#20046,#20047)
+#20048=*
+lines(#20048,#20001,"","
+")
+#20049=@"loc,{#10000},4,1,4,0"
+locations_default(#20049,#10000,4,1,4,0)
+hasLocation(#20048,#20049)
+#20050=*
+lines(#20050,#20001,"alert(greeter(""world""));","
+")
+hasLocation(#20050,#20030)
+numlines(#20001,5,4,0)
+#20051=*
+tokeninfo(#20051,7,#20001,0,"function")
+#20052=@"loc,{#10000},1,1,1,8"
+locations_default(#20052,#10000,1,1,1,8)
+hasLocation(#20051,#20052)
+#20053=*
+tokeninfo(#20053,6,#20001,1,"greeter")
+hasLocation(#20053,#20007)
+#20054=*
+tokeninfo(#20054,8,#20001,2,"(")
+#20055=@"loc,{#10000},1,17,1,17"
+locations_default(#20055,#10000,1,17,1,17)
+hasLocation(#20054,#20055)
+#20056=*
+tokeninfo(#20056,6,#20001,3,"person")
+hasLocation(#20056,#20011)
+#20057=*
+tokeninfo(#20057,8,#20001,4,":")
+#20058=@"loc,{#10000},1,24,1,24"
+locations_default(#20058,#10000,1,24,1,24)
+hasLocation(#20057,#20058)
+#20059=*
+tokeninfo(#20059,7,#20001,5,"string")
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+#20060=*
+tokeninfo(#20060,8,#20001,6,")")
+#20061=@"loc,{#10000},1,32,1,32"
+locations_default(#20061,#10000,1,32,1,32)
+hasLocation(#20060,#20061)
+#20062=*
+tokeninfo(#20062,8,#20001,7,"{")
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+locations_default(#20063,#10000,1,34,1,34)
+hasLocation(#20062,#20063)
+#20064=*
+tokeninfo(#20064,7,#20001,8,"return")
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+locations_default(#20065,#10000,2,5,2,10)
+hasLocation(#20064,#20065)
+#20066=*
+tokeninfo(#20066,4,#20001,9,"""Hello, """)
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+#20067=*
+tokeninfo(#20067,8,#20001,10,"+")
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+locations_default(#20068,#10000,2,22,2,22)
+hasLocation(#20067,#20068)
+#20069=*
+tokeninfo(#20069,6,#20001,11,"person")
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+#20070=*
+tokeninfo(#20070,8,#20001,12,"+")
+#20071=@"loc,{#10000},2,31,2,31"
+locations_default(#20071,#10000,2,31,2,31)
+hasLocation(#20070,#20071)
+#20072=*
+tokeninfo(#20072,4,#20001,13,"""!""")
+hasLocation(#20072,#20028)
+#20073=*
+tokeninfo(#20073,8,#20001,14,";")
+#20074=@"loc,{#10000},2,36,2,36"
+locations_default(#20074,#10000,2,36,2,36)
+hasLocation(#20073,#20074)
+#20075=*
+tokeninfo(#20075,8,#20001,15,"}")
+hasLocation(#20075,#20047)
+#20076=*
+tokeninfo(#20076,6,#20001,16,"alert")
+hasLocation(#20076,#20034)
+#20077=*
+tokeninfo(#20077,8,#20001,17,"(")
+#20078=@"loc,{#10000},5,6,5,6"
+locations_default(#20078,#10000,5,6,5,6)
+hasLocation(#20077,#20078)
+#20079=*
+tokeninfo(#20079,6,#20001,18,"greeter")
+hasLocation(#20079,#20039)
+#20080=*
+tokeninfo(#20080,8,#20001,19,"(")
+#20081=@"loc,{#10000},5,14,5,14"
+locations_default(#20081,#10000,5,14,5,14)
+hasLocation(#20080,#20081)
+#20082=*
+tokeninfo(#20082,4,#20001,20,"""world""")
+hasLocation(#20082,#20041)
+#20083=*
+tokeninfo(#20083,8,#20001,21,")")
+#20084=@"loc,{#10000},5,22,5,22"
+locations_default(#20084,#10000,5,22,5,22)
+hasLocation(#20083,#20084)
+#20085=*
+tokeninfo(#20085,8,#20001,22,")")
+#20086=@"loc,{#10000},5,23,5,23"
+locations_default(#20086,#10000,5,23,5,23)
+hasLocation(#20085,#20086)
+#20087=*
+tokeninfo(#20087,8,#20001,23,";")
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+locations_default(#20088,#10000,5,24,5,24)
+hasLocation(#20087,#20088)
+#20089=*
+tokeninfo(#20089,0,#20001,24,"")
+#20090=@"loc,{#10000},6,1,6,0"
+locations_default(#20090,#10000,6,1,6,0)
+hasLocation(#20089,#20090)
+#20091=*
+entry_cfg_node(#20091,#20001)
+#20092=@"loc,{#10000},1,1,1,0"
+locations_default(#20092,#10000,1,1,1,0)
+hasLocation(#20091,#20092)
+#20093=*
+exit_cfg_node(#20093,#20001)
+hasLocation(#20093,#20090)
+successor(#20029,#20033)
+successor(#20040,#20036)
+successor(#20038,#20040)
+successor(#20036,#20031)
+successor(#20033,#20038)
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+entry_cfg_node(#20094,#20004)
+hasLocation(#20094,#20092)
+#20095=*
+exit_cfg_node(#20095,#20004)
+#20096=@"loc,{#10000},3,2,3,1"
+locations_default(#20096,#10000,3,2,3,1)
+hasLocation(#20095,#20096)
+successor(#20015,#20023)
+successor(#20027,#20019)
+successor(#20025,#20021)
+successor(#20023,#20025)
+successor(#20021,#20027)
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+successor(#20017,#20095)
+successor(#20010,#20015)
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+successor(#20006,#20004)
+successor(#20091,#20006)
+numlines(#10000,5,4,0)
+filetype(#10000,"typescript")
diff --git a/javascript/extractor/tests/ts/output/trap/importExport.ts.trap b/javascript/extractor/tests/ts/output/trap/importExport.ts.trap
new file mode 100644
index 00000000000..de08e495ed8
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/importExport.ts.trap
@@ -0,0 +1,218 @@
+#10000=@"/importExport.ts;sourcefile"
+files(#10000,"/importExport.ts","importExport","ts",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,4,0"
+locations_default(#20002,#10000,1,1,4,0)
+hasLocation(#20001,#20002)
+#20003=@"module;{#10000},1,1"
+scopes(#20003,3)
+scopenodes(#20001,#20003)
+scopenesting(#20003,#20000)
+isModule(#20001)
+#20004=@"var;{Something};{#20003}"
+variables(#20004,"Something",#20003)
+#20005=@"var;{importExport};{#20003}"
+variables(#20005,"importExport",#20003)
+#20006=@"local_type_name;{importExport};{#20003}"
+local_type_names(#20006,"importExport",#20003)
+#20007=@"local_namespace_name;{Something};{#20003}"
+local_namespace_names(#20007,"Something",#20003)
+#20008=@"local_namespace_name;{importExport};{#20003}"
+local_namespace_names(#20008,"importExport",#20003)
+variables(#20004,"Something",#20003)
+variables(#20005,"importExport",#20003)
+local_type_names(#20006,"importExport",#20003)
+local_namespace_names(#20007,"Something",#20003)
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diff --git a/javascript/extractor/tests/ts/output/trap/importassign.ts.trap b/javascript/extractor/tests/ts/output/trap/importassign.ts.trap
new file mode 100644
index 00000000000..e16168664d5
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/importassign.ts.trap
@@ -0,0 +1,122 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/interfaces.ts.trap b/javascript/extractor/tests/ts/output/trap/interfaces.ts.trap
new file mode 100644
index 00000000000..7b31fda6ffa
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/interfaces.ts.trap
@@ -0,0 +1,444 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/invalidModuleSpecifier.ts.trap b/javascript/extractor/tests/ts/output/trap/invalidModuleSpecifier.ts.trap
new file mode 100644
index 00000000000..9dfd0cd54cd
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/invalidModuleSpecifier.ts.trap
@@ -0,0 +1,28 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/let.ts.trap b/javascript/extractor/tests/ts/output/trap/let.ts.trap
new file mode 100644
index 00000000000..09ae5ae76bc
--- /dev/null
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new file mode 100644
index 00000000000..220ec3ec884
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/mappedTypeModifiers.ts.trap
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new file mode 100644
index 00000000000..25a7e9b2043
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/namespaces.ts.trap
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diff --git a/javascript/extractor/tests/ts/output/trap/nestedNamespace.ts.trap b/javascript/extractor/tests/ts/output/trap/nestedNamespace.ts.trap
new file mode 100644
index 00000000000..8efd45b2d70
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/nestedNamespace.ts.trap
@@ -0,0 +1,471 @@
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new file mode 100644
index 00000000000..6453fc5d4c6
--- /dev/null
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new file mode 100644
index 00000000000..6ac70784c1b
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diff --git a/javascript/extractor/tests/ts/output/trap/omitted.ts.trap b/javascript/extractor/tests/ts/output/trap/omitted.ts.trap
new file mode 100644
index 00000000000..9dde794a3c7
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/omitted.ts.trap
@@ -0,0 +1,86 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/regexp.ts.trap b/javascript/extractor/tests/ts/output/trap/regexp.ts.trap
new file mode 100644
index 00000000000..004453ae01f
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/regexp.ts.trap
@@ -0,0 +1,56 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/templates.ts.trap b/javascript/extractor/tests/ts/output/trap/templates.ts.trap
new file mode 100644
index 00000000000..70ff6007831
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/templates.ts.trap
@@ -0,0 +1,142 @@
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diff --git a/javascript/extractor/tests/ts/output/trap/thisparameter.ts.trap b/javascript/extractor/tests/ts/output/trap/thisparameter.ts.trap
new file mode 100644
index 00000000000..a9f7715442d
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/thisparameter.ts.trap
@@ -0,0 +1,759 @@
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new file mode 100644
index 00000000000..70d753e1be0
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new file mode 100644
index 00000000000..b968796c59b
--- /dev/null
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diff --git a/javascript/extractor/tests/ts/output/trap/unicode.ts.trap b/javascript/extractor/tests/ts/output/trap/unicode.ts.trap
new file mode 100644
index 00000000000..0508f485c17
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/unicode.ts.trap
@@ -0,0 +1,58 @@
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+")
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+")
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diff --git a/javascript/extractor/tests/ts/output/trap/unicodeId.ts.trap b/javascript/extractor/tests/ts/output/trap/unicodeId.ts.trap
new file mode 100644
index 00000000000..aa3513e68ee
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/unicodeId.ts.trap
@@ -0,0 +1,93 @@
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+")
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diff --git a/javascript/extractor/tests/ts/output/trap/uninstantiatedNamespace.ts.trap b/javascript/extractor/tests/ts/output/trap/uninstantiatedNamespace.ts.trap
new file mode 100644
index 00000000000..2fe5f45632c
--- /dev/null
+++ b/javascript/extractor/tests/ts/output/trap/uninstantiatedNamespace.ts.trap
@@ -0,0 +1,998 @@
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+locations_default(#20220,#10000,12,29,12,29)
+hasLocation(#20219,#20220)
+#20221=*
+tokeninfo(#20221,8,#20001,27,"}")
+#20222=@"loc,{#10000},13,3,13,3"
+locations_default(#20222,#10000,13,3,13,3)
+hasLocation(#20221,#20222)
+#20223=*
+tokeninfo(#20223,7,#20001,28,"namespace")
+#20224=@"loc,{#10000},14,3,14,11"
+locations_default(#20224,#10000,14,3,14,11)
+hasLocation(#20223,#20224)
+#20225=*
+tokeninfo(#20225,6,#20001,29,"Interfaces")
+hasLocation(#20225,#20057)
+#20226=*
+tokeninfo(#20226,8,#20001,30,"{")
+#20227=@"loc,{#10000},14,24,14,24"
+locations_default(#20227,#10000,14,24,14,24)
+hasLocation(#20226,#20227)
+#20228=*
+tokeninfo(#20228,7,#20001,31,"interface")
+#20229=@"loc,{#10000},15,5,15,13"
+locations_default(#20229,#10000,15,5,15,13)
+hasLocation(#20228,#20229)
+#20230=*
+tokeninfo(#20230,6,#20001,32,"I")
+hasLocation(#20230,#20063)
+#20231=*
+tokeninfo(#20231,8,#20001,33,"{")
+#20232=@"loc,{#10000},15,17,15,17"
+locations_default(#20232,#10000,15,17,15,17)
+hasLocation(#20231,#20232)
+#20233=*
+tokeninfo(#20233,6,#20001,34,"x")
+hasLocation(#20233,#20067)
+#20234=*
+tokeninfo(#20234,8,#20001,35,":")
+#20235=@"loc,{#10000},16,8,16,8"
+locations_default(#20235,#10000,16,8,16,8)
+hasLocation(#20234,#20235)
+#20236=*
+tokeninfo(#20236,7,#20001,36,"number")
+hasLocation(#20236,#20069)
+#20237=*
+tokeninfo(#20237,8,#20001,37,";")
+#20238=@"loc,{#10000},16,16,16,16"
+locations_default(#20238,#10000,16,16,16,16)
+hasLocation(#20237,#20238)
+#20239=*
+tokeninfo(#20239,6,#20001,38,"foo")
+hasLocation(#20239,#20073)
+#20240=*
+tokeninfo(#20240,8,#20001,39,"(")
+#20241=@"loc,{#10000},17,10,17,10"
+locations_default(#20241,#10000,17,10,17,10)
+hasLocation(#20240,#20241)
+#20242=*
+tokeninfo(#20242,8,#20001,40,")")
+#20243=@"loc,{#10000},17,11,17,11"
+locations_default(#20243,#10000,17,11,17,11)
+hasLocation(#20242,#20243)
+#20244=*
+tokeninfo(#20244,8,#20001,41,":")
+#20245=@"loc,{#10000},17,12,17,12"
+locations_default(#20245,#10000,17,12,17,12)
+hasLocation(#20244,#20245)
+#20246=*
+tokeninfo(#20246,7,#20001,42,"number")
+hasLocation(#20246,#20078)
+#20247=*
+tokeninfo(#20247,8,#20001,43,";")
+#20248=@"loc,{#10000},17,20,17,20"
+locations_default(#20248,#10000,17,20,17,20)
+hasLocation(#20247,#20248)
+#20249=*
+tokeninfo(#20249,8,#20001,44,"}")
+#20250=@"loc,{#10000},18,5,18,5"
+locations_default(#20250,#10000,18,5,18,5)
+hasLocation(#20249,#20250)
+#20251=*
+tokeninfo(#20251,8,#20001,45,"}")
+#20252=@"loc,{#10000},19,3,19,3"
+locations_default(#20252,#10000,19,3,19,3)
+hasLocation(#20251,#20252)
+#20253=*
+tokeninfo(#20253,7,#20001,46,"namespace")
+#20254=@"loc,{#10000},21,3,21,11"
+locations_default(#20254,#10000,21,3,21,11)
+hasLocation(#20253,#20254)
+#20255=*
+tokeninfo(#20255,6,#20001,47,"EmptyStatement")
+hasLocation(#20255,#20082)
+#20256=*
+tokeninfo(#20256,8,#20001,48,"{")
+#20257=@"loc,{#10000},21,28,21,28"
+locations_default(#20257,#10000,21,28,21,28)
+hasLocation(#20256,#20257)
+#20258=*
+tokeninfo(#20258,8,#20001,49,";")
+hasLocation(#20258,#20085)
+#20259=*
+tokeninfo(#20259,8,#20001,50,"}")
+#20260=@"loc,{#10000},21,30,21,30"
+locations_default(#20260,#10000,21,30,21,30)
+hasLocation(#20259,#20260)
+#20261=*
+tokeninfo(#20261,7,#20001,51,"namespace")
+#20262=@"loc,{#10000},22,3,22,11"
+locations_default(#20262,#10000,22,3,22,11)
+hasLocation(#20261,#20262)
+#20263=*
+tokeninfo(#20263,6,#20001,52,"EmptyBlock")
+hasLocation(#20263,#20089)
+#20264=*
+tokeninfo(#20264,8,#20001,53,"{")
+#20265=@"loc,{#10000},22,24,22,24"
+locations_default(#20265,#10000,22,24,22,24)
+hasLocation(#20264,#20265)
+#20266=*
+tokeninfo(#20266,8,#20001,54,"{")
+#20267=@"loc,{#10000},22,25,22,25"
+locations_default(#20267,#10000,22,25,22,25)
+hasLocation(#20266,#20267)
+#20268=*
+tokeninfo(#20268,8,#20001,55,"}")
+#20269=@"loc,{#10000},22,26,22,26"
+locations_default(#20269,#10000,22,26,22,26)
+hasLocation(#20268,#20269)
+#20270=*
+tokeninfo(#20270,8,#20001,56,"}")
+#20271=@"loc,{#10000},22,27,22,27"
+locations_default(#20271,#10000,22,27,22,27)
+hasLocation(#20270,#20271)
+#20272=*
+tokeninfo(#20272,7,#20001,57,"var")
+#20273=@"loc,{#10000},24,3,24,5"
+locations_default(#20273,#10000,24,3,24,5)
+hasLocation(#20272,#20273)
+#20274=*
+tokeninfo(#20274,6,#20001,58,"x")
+hasLocation(#20274,#20098)
+#20275=*
+tokeninfo(#20275,8,#20001,59,"=")
+#20276=@"loc,{#10000},24,9,24,9"
+locations_default(#20276,#10000,24,9,24,9)
+hasLocation(#20275,#20276)
+#20277=*
+tokeninfo(#20277,8,#20001,60,"[")
+#20278=@"loc,{#10000},24,11,24,11"
+locations_default(#20278,#10000,24,11,24,11)
+hasLocation(#20277,#20278)
+#20279=*
+tokeninfo(#20279,6,#20001,61,"Empty")
+hasLocation(#20279,#20102)
+#20280=*
+tokeninfo(#20280,8,#20001,62,",")
+#20281=@"loc,{#10000},24,17,24,17"
+locations_default(#20281,#10000,24,17,24,17)
+hasLocation(#20280,#20281)
+#20282=*
+tokeninfo(#20282,6,#20001,63,"Comments")
+hasLocation(#20282,#20105)
+#20283=*
+tokeninfo(#20283,8,#20001,64,",")
+#20284=@"loc,{#10000},24,27,24,27"
+locations_default(#20284,#10000,24,27,24,27)
+hasLocation(#20283,#20284)
+#20285=*
+tokeninfo(#20285,6,#20001,65,"Outer")
+hasLocation(#20285,#20108)
+#20286=*
+tokeninfo(#20286,8,#20001,66,",")
+#20287=@"loc,{#10000},24,34,24,34"
+locations_default(#20287,#10000,24,34,24,34)
+hasLocation(#20286,#20287)
+#20288=*
+tokeninfo(#20288,6,#20001,67,"Outer2")
+hasLocation(#20288,#20111)
+#20289=*
+tokeninfo(#20289,8,#20001,68,",")
+#20290=@"loc,{#10000},24,42,24,42"
+locations_default(#20290,#10000,24,42,24,42)
+hasLocation(#20289,#20290)
+#20291=*
+tokeninfo(#20291,6,#20001,69,"Interfaces")
+hasLocation(#20291,#20114)
+#20292=*
+tokeninfo(#20292,8,#20001,70,",")
+#20293=@"loc,{#10000},24,54,24,54"
+locations_default(#20293,#10000,24,54,24,54)
+hasLocation(#20292,#20293)
+#20294=*
+tokeninfo(#20294,6,#20001,71,"EmptyStatement")
+hasLocation(#20294,#20117)
+#20295=*
+tokeninfo(#20295,8,#20001,72,",")
+#20296=@"loc,{#10000},24,70,24,70"
+locations_default(#20296,#10000,24,70,24,70)
+hasLocation(#20295,#20296)
+#20297=*
+tokeninfo(#20297,6,#20001,73,"EmptyBlock")
+hasLocation(#20297,#20119)
+#20298=*
+tokeninfo(#20298,8,#20001,74,"]")
+#20299=@"loc,{#10000},24,82,24,82"
+locations_default(#20299,#10000,24,82,24,82)
+hasLocation(#20298,#20299)
+#20300=*
+tokeninfo(#20300,8,#20001,75,"}")
+hasLocation(#20300,#20173)
+#20301=*
+tokeninfo(#20301,0,#20001,76,"")
+#20302=@"loc,{#10000},26,1,26,0"
+locations_default(#20302,#10000,26,1,26,0)
+hasLocation(#20301,#20302)
+#20303=*
+entry_cfg_node(#20303,#20001)
+#20304=@"loc,{#10000},1,1,1,0"
+locations_default(#20304,#10000,1,1,1,0)
+hasLocation(#20303,#20304)
+#20305=*
+exit_cfg_node(#20305,#20001)
+hasLocation(#20305,#20302)
+successor(#20007,#20005)
+successor(#20093,#20097)
+successor(#20099,#20101)
+successor(#20118,#20095)
+successor(#20116,#20118)
+successor(#20113,#20116)
+successor(#20110,#20113)
+successor(#20107,#20110)
+successor(#20104,#20107)
+successor(#20101,#20104)
+successor(#20097,#20099)
+successor(#20095,#20305)
+successor(#20088,#20086)
+successor(#20091,#20093)
+successor(#20086,#20091)
+successor(#20081,#20079)
+successor(#20084,#20088)
+successor(#20079,#20084)
+successor(#20056,#20054)
+successor(#20060,#20081)
+successor(#20054,#20060)
+successor(#20043,#20041)
+successor(#20047,#20051)
+successor(#20051,#20049)
+successor(#20049,#20056)
+successor(#20041,#20047)
+successor(#20032,#20030)
+successor(#20038,#20036)
+successor(#20036,#20043)
+successor(#20030,#20038)
+successor(#20027,#20025)
+successor(#20025,#20032)
+successor(#20022,#20020)
+successor(#20020,#20027)
+successor(#20005,#20022)
+successor(#20303,#20007)
+numlines(#10000,25,20,2)
+filetype(#10000,"typescript")
diff --git a/javascript/extractor/tests/v8/input/tst.js b/javascript/extractor/tests/v8/input/tst.js
new file mode 100644
index 00000000000..56433afb380
--- /dev/null
+++ b/javascript/extractor/tests/v8/input/tst.js
@@ -0,0 +1,2 @@
+%CheckIsBootstrapping();
+a%%NumberAdd(1, 2);
\ No newline at end of file
diff --git a/javascript/extractor/tests/v8/options.json b/javascript/extractor/tests/v8/options.json
new file mode 100644
index 00000000000..075583ca1f6
--- /dev/null
+++ b/javascript/extractor/tests/v8/options.json
@@ -0,0 +1,3 @@
+{
+    "experimental": true
+}
diff --git a/javascript/extractor/tests/v8/output/trap/tst.js.trap b/javascript/extractor/tests/v8/output/trap/tst.js.trap
new file mode 100644
index 00000000000..cb2ccc20a90
--- /dev/null
+++ b/javascript/extractor/tests/v8/output/trap/tst.js.trap
@@ -0,0 +1,196 @@
+#10000=@"/tst.js;sourcefile"
+files(#10000,"/tst.js","tst","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=@"script;{#10000},1,1"
+toplevels(#20001,0)
+#20002=@"loc,{#10000},1,1,2,19"
+locations_default(#20002,#10000,1,1,2,19)
+hasLocation(#20001,#20002)
+#20003=*
+stmts(#20003,2,#20001,0,"%CheckI ... ping();")
+#20004=@"loc,{#10000},1,1,1,24"
+locations_default(#20004,#10000,1,1,1,24)
+hasLocation(#20003,#20004)
+stmtContainers(#20003,#20001)
+#20005=*
+exprs(#20005,13,#20003,0,"%CheckI ... pping()")
+#20006=@"loc,{#10000},1,1,1,23"
+locations_default(#20006,#10000,1,1,1,23)
+hasLocation(#20005,#20006)
+enclosingStmt(#20005,#20003)
+exprContainers(#20005,#20001)
+#20007=*
+exprs(#20007,79,#20005,-1,"CheckIsBootstrapping")
+#20008=@"loc,{#10000},1,2,1,21"
+locations_default(#20008,#10000,1,2,1,21)
+hasLocation(#20007,#20008)
+enclosingStmt(#20007,#20003)
+exprContainers(#20007,#20001)
+literals("CheckIsBootstrapping","CheckIsBootstrapping",#20007)
+#20009=@"var;{CheckIsBootstrapping};{#20000}"
+variables(#20009,"CheckIsBootstrapping",#20000)
+bind(#20007,#20009)
+#20010=*
+stmts(#20010,2,#20001,1,"a%%NumberAdd(1, 2);")
+#20011=@"loc,{#10000},2,1,2,19"
+locations_default(#20011,#10000,2,1,2,19)
+hasLocation(#20010,#20011)
+stmtContainers(#20010,#20001)
+#20012=*
+exprs(#20012,38,#20010,0,"a%%NumberAdd(1, 2)")
+#20013=@"loc,{#10000},2,1,2,18"
+locations_default(#20013,#10000,2,1,2,18)
+hasLocation(#20012,#20013)
+enclosingStmt(#20012,#20010)
+exprContainers(#20012,#20001)
+#20014=*
+exprs(#20014,79,#20012,0,"a")
+#20015=@"loc,{#10000},2,1,2,1"
+locations_default(#20015,#10000,2,1,2,1)
+hasLocation(#20014,#20015)
+enclosingStmt(#20014,#20010)
+exprContainers(#20014,#20001)
+literals("a","a",#20014)
+#20016=@"var;{a};{#20000}"
+variables(#20016,"a",#20000)
+bind(#20014,#20016)
+#20017=*
+exprs(#20017,13,#20012,1,"%NumberAdd(1, 2)")
+#20018=@"loc,{#10000},2,3,2,18"
+locations_default(#20018,#10000,2,3,2,18)
+hasLocation(#20017,#20018)
+enclosingStmt(#20017,#20010)
+exprContainers(#20017,#20001)
+#20019=*
+exprs(#20019,79,#20017,-1,"NumberAdd")
+#20020=@"loc,{#10000},2,4,2,12"
+locations_default(#20020,#10000,2,4,2,12)
+hasLocation(#20019,#20020)
+enclosingStmt(#20019,#20010)
+exprContainers(#20019,#20001)
+literals("NumberAdd","NumberAdd",#20019)
+#20021=@"var;{NumberAdd};{#20000}"
+variables(#20021,"NumberAdd",#20000)
+bind(#20019,#20021)
+#20022=*
+exprs(#20022,3,#20017,0,"1")
+#20023=@"loc,{#10000},2,14,2,14"
+locations_default(#20023,#10000,2,14,2,14)
+hasLocation(#20022,#20023)
+enclosingStmt(#20022,#20010)
+exprContainers(#20022,#20001)
+literals("1","1",#20022)
+#20024=*
+exprs(#20024,3,#20017,1,"2")
+#20025=@"loc,{#10000},2,17,2,17"
+locations_default(#20025,#10000,2,17,2,17)
+hasLocation(#20024,#20025)
+enclosingStmt(#20024,#20010)
+exprContainers(#20024,#20001)
+literals("2","2",#20024)
+#20026=*
+lines(#20026,#20001,"%CheckIsBootstrapping();","
+")
+hasLocation(#20026,#20004)
+#20027=*
+lines(#20027,#20001,"a%%NumberAdd(1, 2);","")
+hasLocation(#20027,#20011)
+numlines(#20001,2,2,0)
+#20028=*
+tokeninfo(#20028,8,#20001,0,"%")
+#20029=@"loc,{#10000},1,1,1,1"
+locations_default(#20029,#10000,1,1,1,1)
+hasLocation(#20028,#20029)
+#20030=*
+tokeninfo(#20030,6,#20001,1,"CheckIsBootstrapping")
+hasLocation(#20030,#20008)
+#20031=*
+tokeninfo(#20031,8,#20001,2,"(")
+#20032=@"loc,{#10000},1,22,1,22"
+locations_default(#20032,#10000,1,22,1,22)
+hasLocation(#20031,#20032)
+#20033=*
+tokeninfo(#20033,8,#20001,3,")")
+#20034=@"loc,{#10000},1,23,1,23"
+locations_default(#20034,#10000,1,23,1,23)
+hasLocation(#20033,#20034)
+#20035=*
+tokeninfo(#20035,8,#20001,4,";")
+#20036=@"loc,{#10000},1,24,1,24"
+locations_default(#20036,#10000,1,24,1,24)
+hasLocation(#20035,#20036)
+#20037=*
+tokeninfo(#20037,6,#20001,5,"a")
+hasLocation(#20037,#20015)
+#20038=*
+tokeninfo(#20038,8,#20001,6,"%")
+#20039=@"loc,{#10000},2,2,2,2"
+locations_default(#20039,#10000,2,2,2,2)
+hasLocation(#20038,#20039)
+#20040=*
+tokeninfo(#20040,8,#20001,7,"%")
+#20041=@"loc,{#10000},2,3,2,3"
+locations_default(#20041,#10000,2,3,2,3)
+hasLocation(#20040,#20041)
+#20042=*
+tokeninfo(#20042,6,#20001,8,"NumberAdd")
+hasLocation(#20042,#20020)
+#20043=*
+tokeninfo(#20043,8,#20001,9,"(")
+#20044=@"loc,{#10000},2,13,2,13"
+locations_default(#20044,#10000,2,13,2,13)
+hasLocation(#20043,#20044)
+#20045=*
+tokeninfo(#20045,3,#20001,10,"1")
+hasLocation(#20045,#20023)
+#20046=*
+tokeninfo(#20046,8,#20001,11,",")
+#20047=@"loc,{#10000},2,15,2,15"
+locations_default(#20047,#10000,2,15,2,15)
+hasLocation(#20046,#20047)
+#20048=*
+tokeninfo(#20048,3,#20001,12,"2")
+hasLocation(#20048,#20025)
+#20049=*
+tokeninfo(#20049,8,#20001,13,")")
+#20050=@"loc,{#10000},2,18,2,18"
+locations_default(#20050,#10000,2,18,2,18)
+hasLocation(#20049,#20050)
+#20051=*
+tokeninfo(#20051,8,#20001,14,";")
+#20052=@"loc,{#10000},2,19,2,19"
+locations_default(#20052,#10000,2,19,2,19)
+hasLocation(#20051,#20052)
+#20053=*
+tokeninfo(#20053,0,#20001,15,"")
+#20054=@"loc,{#10000},2,20,2,19"
+locations_default(#20054,#10000,2,20,2,19)
+hasLocation(#20053,#20054)
+#20055=*
+entry_cfg_node(#20055,#20001)
+#20056=@"loc,{#10000},1,1,1,0"
+locations_default(#20056,#10000,1,1,1,0)
+hasLocation(#20055,#20056)
+#20057=*
+exit_cfg_node(#20057,#20001)
+hasLocation(#20057,#20054)
+successor(#20010,#20014)
+successor(#20024,#20017)
+successor(#20022,#20024)
+successor(#20019,#20022)
+successor(#20017,#20012)
+successor(#20014,#20019)
+successor(#20012,#20057)
+successor(#20003,#20007)
+successor(#20007,#20005)
+successor(#20005,#20010)
+successor(#20055,#20003)
+numlines(#10000,2,2,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/variables/input/const.js b/javascript/extractor/tests/variables/input/const.js
new file mode 100644
index 00000000000..398d670719c
--- /dev/null
+++ b/javascript/extractor/tests/variables/input/const.js
@@ -0,0 +1 @@
+const answer = 42;
\ No newline at end of file
diff --git a/javascript/extractor/tests/variables/input/finally.js b/javascript/extractor/tests/variables/input/finally.js
new file mode 100644
index 00000000000..c3ee36500d2
--- /dev/null
+++ b/javascript/extractor/tests/variables/input/finally.js
@@ -0,0 +1,8 @@
+function f(x) {
+  function g() {
+    try {
+    } finally {
+      var x;
+    }
+  }
+}
diff --git a/javascript/extractor/tests/variables/input/switch.js b/javascript/extractor/tests/variables/input/switch.js
new file mode 100644
index 00000000000..b9cc5bfe1bb
--- /dev/null
+++ b/javascript/extractor/tests/variables/input/switch.js
@@ -0,0 +1,6 @@
+function g() {
+	switch (0) {
+	default:
+		var i;
+	}
+}
diff --git a/javascript/extractor/tests/variables/input/try.js b/javascript/extractor/tests/variables/input/try.js
new file mode 100644
index 00000000000..170d204f5cc
--- /dev/null
+++ b/javascript/extractor/tests/variables/input/try.js
@@ -0,0 +1,5 @@
+function f() {
+	try {
+		var x;
+	} finally {}
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/variables/input/variables.js b/javascript/extractor/tests/variables/input/variables.js
new file mode 100644
index 00000000000..d53cf314bcd
--- /dev/null
+++ b/javascript/extractor/tests/variables/input/variables.js
@@ -0,0 +1,19 @@
+var global;
+also_a_global = 23;
+global;
+another_global;
+{
+	var another_global;
+}
+function f() {
+	var x;
+	x;
+}
+function g() {
+	x;
+	var x;
+	{
+		function h() {}
+		!function k() {}
+	}
+}
\ No newline at end of file
diff --git a/javascript/extractor/tests/variables/output/trap/const.js.trap b/javascript/extractor/tests/variables/output/trap/const.js.trap
new file mode 100644
index 00000000000..e3e1846c4fc
--- /dev/null
+++ b/javascript/extractor/tests/variables/output/trap/const.js.trap
@@ -0,0 +1,90 @@
+#10000=@"/const.js;sourcefile"
+files(#10000,"/const.js","const","js",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
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new file mode 100644
index 00000000000..b1c76a9e920
--- /dev/null
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index 00000000000..f3cd6549fb6
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diff --git a/javascript/extractor/tests/variables/output/trap/try.js.trap b/javascript/extractor/tests/variables/output/trap/try.js.trap
new file mode 100644
index 00000000000..601b9e6d413
--- /dev/null
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diff --git a/javascript/extractor/tests/variables/output/trap/variables.js.trap b/javascript/extractor/tests/variables/output/trap/variables.js.trap
new file mode 100644
index 00000000000..38256367619
--- /dev/null
+++ b/javascript/extractor/tests/variables/output/trap/variables.js.trap
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+successor(#20023,#20025)
+successor(#20012,#20016)
+successor(#20019,#20014)
+successor(#20016,#20019)
+successor(#20014,#20021)
+successor(#20007,#20011)
+successor(#20011,#20009)
+successor(#20009,#20012)
+successor(#20056,#20007)
+successor(#20038,#20056)
+successor(#20219,#20038)
+numlines(#10000,19,19,0)
+filetype(#10000,"javascript")
diff --git a/javascript/extractor/tests/vue/input/test.vue b/javascript/extractor/tests/vue/input/test.vue
new file mode 100644
index 00000000000..6c70bcfe4d4
--- /dev/null
+++ b/javascript/extractor/tests/vue/input/test.vue
@@ -0,0 +1 @@
+<html></html>
\ No newline at end of file
diff --git a/javascript/extractor/tests/vue/output/trap/test.vue.trap b/javascript/extractor/tests/vue/output/trap/test.vue.trap
new file mode 100644
index 00000000000..8b2e7e79195
--- /dev/null
+++ b/javascript/extractor/tests/vue/output/trap/test.vue.trap
@@ -0,0 +1,17 @@
+#10000=@"/test.vue;sourcefile"
+files(#10000,"/test.vue","test","vue",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=@"global_scope"
+scopes(#20000,0)
+#20001=*
+xmlElements(#20001,"html",#10000,0,#10000)
+#20002=@"loc,{#10000},1,1,1,13"
+locations_default(#20002,#10000,1,1,1,13)
+xmllocations(#20001,#20002)
+numlines(#10000,1,0,0)
+filetype(#10000,"html")
diff --git a/javascript/extractor/tests/yaml/input/cyclic.yaml b/javascript/extractor/tests/yaml/input/cyclic.yaml
new file mode 100644
index 00000000000..ee3bb55b2fc
--- /dev/null
+++ b/javascript/extractor/tests/yaml/input/cyclic.yaml
@@ -0,0 +1,3 @@
+---
+cyclic: &cyc
+    backedge: *cyc
diff --git a/javascript/extractor/tests/yaml/input/merge.yaml b/javascript/extractor/tests/yaml/input/merge.yaml
new file mode 100644
index 00000000000..0bd92fa725b
--- /dev/null
+++ b/javascript/extractor/tests/yaml/input/merge.yaml
@@ -0,0 +1,3 @@
+- &A { x: 23, y: 42 }
+- x: 56
+  <<: *A
\ No newline at end of file
diff --git a/javascript/extractor/tests/yaml/input/tst.yml b/javascript/extractor/tests/yaml/input/tst.yml
new file mode 100644
index 00000000000..aeec65c2e9c
--- /dev/null
+++ b/javascript/extractor/tests/yaml/input/tst.yml
@@ -0,0 +1,33 @@
+---
+receipt:     Oz-Ware Purchase Invoice
+date:        2012-08-06
+customer:
+    given:   Dorothy
+    family:  Gale
+
+items:
+    - part_no:   A4786
+      descrip:   Water Bucket (Filled)
+      price:     1.47
+      quantity:  4
+
+    - part_no:   E1628
+      descrip:   High Heeled "Ruby" Slippers
+      size:      8
+      price:     100.27
+      quantity:  1
+
+bill-to:  &id001
+    street: |
+            123 Tornado Alley
+            Suite 16
+    city:   East Centerville
+    state:  KS
+
+ship-to:  *id001
+
+specialDelivery:  >
+    Follow the Yellow Brick
+    Road to the Emerald City.
+    Pay no attention to the
+    man behind the curtain.
\ No newline at end of file
diff --git a/javascript/extractor/tests/yaml/output/trap/cyclic.yaml.trap b/javascript/extractor/tests/yaml/output/trap/cyclic.yaml.trap
new file mode 100644
index 00000000000..292d24f957d
--- /dev/null
+++ b/javascript/extractor/tests/yaml/output/trap/cyclic.yaml.trap
@@ -0,0 +1,39 @@
+#10000=@"/cyclic.yaml;sourcefile"
+files(#10000,"/cyclic.yaml","cyclic","yaml",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+#20001=*
+yaml_scalars(#20001,0,"cyclic")
+yaml(#20001,0,#20000,1,"tag:yaml.org,2002:str","cyclic")
+#20002=@"loc,{#10000},2,1,2,6"
+locations_default(#20002,#10000,2,1,2,6)
+hasLocation(#20001,#20002)
+#20003=*
+yaml_anchors(#20003,"cyc")
+#20004=*
+yaml_scalars(#20004,0,"backedge")
+yaml(#20004,0,#20003,1,"tag:yaml.org,2002:str","backedge")
+#20005=@"loc,{#10000},3,5,3,12"
+locations_default(#20005,#10000,3,5,3,12)
+hasLocation(#20004,#20005)
+#20006=*
+yaml_aliases(#20006,"cyc")
+yaml(#20006,3,#20003,-1,"","*cyc")
+#20007=@"loc,{#10000},3,15,3,18"
+locations_default(#20007,#10000,3,15,3,18)
+hasLocation(#20006,#20007)
+yaml(#20003,1,#20000,-1,"tag:yaml.org,2002:map","&cyc")
+#20008=@"loc,{#10000},2,9,4,0"
+locations_default(#20008,#10000,2,9,4,0)
+hasLocation(#20003,#20008)
+yaml(#20000,1,#10000,0,"tag:yaml.org,2002:map","cyclic: &cyc")
+#20009=@"loc,{#10000},2,1,4,0"
+locations_default(#20009,#10000,2,1,4,0)
+hasLocation(#20000,#20009)
+numlines(#10000,3,0,0)
+filetype(#10000,"yaml")
diff --git a/javascript/extractor/tests/yaml/output/trap/merge.yaml.trap b/javascript/extractor/tests/yaml/output/trap/merge.yaml.trap
new file mode 100644
index 00000000000..759f2946e57
--- /dev/null
+++ b/javascript/extractor/tests/yaml/output/trap/merge.yaml.trap
@@ -0,0 +1,74 @@
+#10000=@"/merge.yaml;sourcefile"
+files(#10000,"/merge.yaml","merge","yaml",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+#20001=*
+yaml_anchors(#20001,"A")
+#20002=*
+yaml_scalars(#20002,0,"x")
+yaml(#20002,0,#20001,1,"tag:yaml.org,2002:str","x")
+#20003=@"loc,{#10000},1,8,1,8"
+locations_default(#20003,#10000,1,8,1,8)
+hasLocation(#20002,#20003)
+#20004=*
+yaml_scalars(#20004,0,"23")
+yaml(#20004,0,#20001,-1,"tag:yaml.org,2002:int","23")
+#20005=@"loc,{#10000},1,11,1,12"
+locations_default(#20005,#10000,1,11,1,12)
+hasLocation(#20004,#20005)
+#20006=*
+yaml_scalars(#20006,0,"y")
+yaml(#20006,0,#20001,2,"tag:yaml.org,2002:str","y")
+#20007=@"loc,{#10000},1,15,1,15"
+locations_default(#20007,#10000,1,15,1,15)
+hasLocation(#20006,#20007)
+#20008=*
+yaml_scalars(#20008,0,"42")
+yaml(#20008,0,#20001,-2,"tag:yaml.org,2002:int","42")
+#20009=@"loc,{#10000},1,18,1,19"
+locations_default(#20009,#10000,1,18,1,19)
+hasLocation(#20008,#20009)
+yaml(#20001,1,#20000,0,"tag:yaml.org,2002:map","&A { x: 23, y: 42 }")
+#20010=@"loc,{#10000},1,3,1,21"
+locations_default(#20010,#10000,1,3,1,21)
+hasLocation(#20001,#20010)
+#20011=*
+#20012=*
+yaml_scalars(#20012,0,"x")
+yaml(#20012,0,#20011,1,"tag:yaml.org,2002:str","x")
+#20013=@"loc,{#10000},2,3,2,3"
+locations_default(#20013,#10000,2,3,2,3)
+hasLocation(#20012,#20013)
+#20014=*
+yaml_scalars(#20014,0,"56")
+yaml(#20014,0,#20011,-1,"tag:yaml.org,2002:int","56")
+#20015=@"loc,{#10000},2,6,2,7"
+locations_default(#20015,#10000,2,6,2,7)
+hasLocation(#20014,#20015)
+#20016=*
+yaml_scalars(#20016,0,"<<")
+yaml(#20016,0,#20011,2,"tag:yaml.org,2002:merge","<<")
+#20017=@"loc,{#10000},3,3,3,4"
+locations_default(#20017,#10000,3,3,3,4)
+hasLocation(#20016,#20017)
+#20018=*
+yaml_aliases(#20018,"A")
+yaml(#20018,3,#20011,-2,"","*A")
+#20019=@"loc,{#10000},3,7,3,8"
+locations_default(#20019,#10000,3,7,3,8)
+hasLocation(#20018,#20019)
+yaml(#20011,1,#20000,1,"tag:yaml.org,2002:map","x: 56")
+#20020=@"loc,{#10000},2,3,3,8"
+locations_default(#20020,#10000,2,3,3,8)
+hasLocation(#20011,#20020)
+yaml(#20000,2,#10000,0,"tag:yaml.org,2002:seq","- &A {  ... y: 42 }")
+#20021=@"loc,{#10000},1,1,3,8"
+locations_default(#20021,#10000,1,1,3,8)
+hasLocation(#20000,#20021)
+numlines(#10000,3,0,0)
+filetype(#10000,"yaml")
diff --git a/javascript/extractor/tests/yaml/output/trap/tst.yml.trap b/javascript/extractor/tests/yaml/output/trap/tst.yml.trap
new file mode 100644
index 00000000000..65e84140f1a
--- /dev/null
+++ b/javascript/extractor/tests/yaml/output/trap/tst.yml.trap
@@ -0,0 +1,277 @@
+#10000=@"/tst.yml;sourcefile"
+files(#10000,"/tst.yml","tst","yml",0)
+#10001=@"/;folder"
+folders(#10001,"/","")
+containerparent(#10001,#10000)
+#10002=@"loc,{#10000},0,0,0,0"
+locations_default(#10002,#10000,0,0,0,0)
+hasLocation(#10000,#10002)
+#20000=*
+#20001=*
+yaml_scalars(#20001,0,"receipt")
+yaml(#20001,0,#20000,1,"tag:yaml.org,2002:str","receipt")
+#20002=@"loc,{#10000},2,1,2,7"
+locations_default(#20002,#10000,2,1,2,7)
+hasLocation(#20001,#20002)
+#20003=*
+yaml_scalars(#20003,0,"Oz-Ware Purchase Invoice")
+yaml(#20003,0,#20000,-1,"tag:yaml.org,2002:str","Oz-Ware ... Invoice")
+#20004=@"loc,{#10000},2,14,2,37"
+locations_default(#20004,#10000,2,14,2,37)
+hasLocation(#20003,#20004)
+#20005=*
+yaml_scalars(#20005,0,"date")
+yaml(#20005,0,#20000,2,"tag:yaml.org,2002:str","date")
+#20006=@"loc,{#10000},3,1,3,4"
+locations_default(#20006,#10000,3,1,3,4)
+hasLocation(#20005,#20006)
+#20007=*
+yaml_scalars(#20007,0,"2012-08-06")
+yaml(#20007,0,#20000,-2,"tag:yaml.org,2002:timestamp","2012-08-06")
+#20008=@"loc,{#10000},3,14,3,23"
+locations_default(#20008,#10000,3,14,3,23)
+hasLocation(#20007,#20008)
+#20009=*
+yaml_scalars(#20009,0,"customer")
+yaml(#20009,0,#20000,3,"tag:yaml.org,2002:str","customer")
+#20010=@"loc,{#10000},4,1,4,8"
+locations_default(#20010,#10000,4,1,4,8)
+hasLocation(#20009,#20010)
+#20011=*
+#20012=*
+yaml_scalars(#20012,0,"given")
+yaml(#20012,0,#20011,1,"tag:yaml.org,2002:str","given")
+#20013=@"loc,{#10000},5,5,5,9"
+locations_default(#20013,#10000,5,5,5,9)
+hasLocation(#20012,#20013)
+#20014=*
+yaml_scalars(#20014,0,"Dorothy")
+yaml(#20014,0,#20011,-1,"tag:yaml.org,2002:str","Dorothy")
+#20015=@"loc,{#10000},5,14,5,20"
+locations_default(#20015,#10000,5,14,5,20)
+hasLocation(#20014,#20015)
+#20016=*
+yaml_scalars(#20016,0,"family")
+yaml(#20016,0,#20011,2,"tag:yaml.org,2002:str","family")
+#20017=@"loc,{#10000},6,5,6,10"
+locations_default(#20017,#10000,6,5,6,10)
+hasLocation(#20016,#20017)
+#20018=*
+yaml_scalars(#20018,0,"Gale")
+yaml(#20018,0,#20011,-2,"tag:yaml.org,2002:str","Gale")
+#20019=@"loc,{#10000},6,14,6,17"
+locations_default(#20019,#10000,6,14,6,17)
+hasLocation(#20018,#20019)
+yaml(#20011,1,#20000,-3,"tag:yaml.org,2002:map","given:   Dorothy")
+#20020=@"loc,{#10000},5,5,8,0"
+locations_default(#20020,#10000,5,5,8,0)
+hasLocation(#20011,#20020)
+#20021=*
+yaml_scalars(#20021,0,"items")
+yaml(#20021,0,#20000,4,"tag:yaml.org,2002:str","items")
+#20022=@"loc,{#10000},8,1,8,5"
+locations_default(#20022,#10000,8,1,8,5)
+hasLocation(#20021,#20022)
+#20023=*
+#20024=*
+#20025=*
+yaml_scalars(#20025,0,"part_no")
+yaml(#20025,0,#20024,1,"tag:yaml.org,2002:str","part_no")
+#20026=@"loc,{#10000},9,7,9,13"
+locations_default(#20026,#10000,9,7,9,13)
+hasLocation(#20025,#20026)
+#20027=*
+yaml_scalars(#20027,0,"A4786")
+yaml(#20027,0,#20024,-1,"tag:yaml.org,2002:str","A4786")
+#20028=@"loc,{#10000},9,18,9,22"
+locations_default(#20028,#10000,9,18,9,22)
+hasLocation(#20027,#20028)
+#20029=*
+yaml_scalars(#20029,0,"descrip")
+yaml(#20029,0,#20024,2,"tag:yaml.org,2002:str","descrip")
+#20030=@"loc,{#10000},10,7,10,13"
+locations_default(#20030,#10000,10,7,10,13)
+hasLocation(#20029,#20030)
+#20031=*
+yaml_scalars(#20031,0,"Water Bucket (Filled)")
+yaml(#20031,0,#20024,-2,"tag:yaml.org,2002:str","Water B ... Filled)")
+#20032=@"loc,{#10000},10,18,10,38"
+locations_default(#20032,#10000,10,18,10,38)
+hasLocation(#20031,#20032)
+#20033=*
+yaml_scalars(#20033,0,"price")
+yaml(#20033,0,#20024,3,"tag:yaml.org,2002:str","price")
+#20034=@"loc,{#10000},11,7,11,11"
+locations_default(#20034,#10000,11,7,11,11)
+hasLocation(#20033,#20034)
+#20035=*
+yaml_scalars(#20035,0,"1.47")
+yaml(#20035,0,#20024,-3,"tag:yaml.org,2002:float","1.47")
+#20036=@"loc,{#10000},11,18,11,21"
+locations_default(#20036,#10000,11,18,11,21)
+hasLocation(#20035,#20036)
+#20037=*
+yaml_scalars(#20037,0,"quantity")
+yaml(#20037,0,#20024,4,"tag:yaml.org,2002:str","quantity")
+#20038=@"loc,{#10000},12,7,12,14"
+locations_default(#20038,#10000,12,7,12,14)
+hasLocation(#20037,#20038)
+#20039=*
+yaml_scalars(#20039,0,"4")
+yaml(#20039,0,#20024,-4,"tag:yaml.org,2002:int","4")
+#20040=@"loc,{#10000},12,18,12,18"
+locations_default(#20040,#10000,12,18,12,18)
+hasLocation(#20039,#20040)
+yaml(#20024,1,#20023,0,"tag:yaml.org,2002:map","part_no:   A4786")
+#20041=@"loc,{#10000},9,7,14,4"
+locations_default(#20041,#10000,9,7,14,4)
+hasLocation(#20024,#20041)
+#20042=*
+#20043=*
+yaml_scalars(#20043,0,"part_no")
+yaml(#20043,0,#20042,1,"tag:yaml.org,2002:str","part_no")
+#20044=@"loc,{#10000},14,7,14,13"
+locations_default(#20044,#10000,14,7,14,13)
+hasLocation(#20043,#20044)
+#20045=*
+yaml_scalars(#20045,0,"E1628")
+yaml(#20045,0,#20042,-1,"tag:yaml.org,2002:str","E1628")
+#20046=@"loc,{#10000},14,18,14,22"
+locations_default(#20046,#10000,14,18,14,22)
+hasLocation(#20045,#20046)
+#20047=*
+yaml_scalars(#20047,0,"descrip")
+yaml(#20047,0,#20042,2,"tag:yaml.org,2002:str","descrip")
+#20048=@"loc,{#10000},15,7,15,13"
+locations_default(#20048,#10000,15,7,15,13)
+hasLocation(#20047,#20048)
+#20049=*
+yaml_scalars(#20049,0,"High Heeled ""Ruby"" Slippers")
+yaml(#20049,0,#20042,-2,"tag:yaml.org,2002:str","High He ... lippers")
+#20050=@"loc,{#10000},15,18,15,44"
+locations_default(#20050,#10000,15,18,15,44)
+hasLocation(#20049,#20050)
+#20051=*
+yaml_scalars(#20051,0,"size")
+yaml(#20051,0,#20042,3,"tag:yaml.org,2002:str","size")
+#20052=@"loc,{#10000},16,7,16,10"
+locations_default(#20052,#10000,16,7,16,10)
+hasLocation(#20051,#20052)
+#20053=*
+yaml_scalars(#20053,0,"8")
+yaml(#20053,0,#20042,-3,"tag:yaml.org,2002:int","8")
+#20054=@"loc,{#10000},16,18,16,18"
+locations_default(#20054,#10000,16,18,16,18)
+hasLocation(#20053,#20054)
+#20055=*
+yaml_scalars(#20055,0,"price")
+yaml(#20055,0,#20042,4,"tag:yaml.org,2002:str","price")
+#20056=@"loc,{#10000},17,7,17,11"
+locations_default(#20056,#10000,17,7,17,11)
+hasLocation(#20055,#20056)
+#20057=*
+yaml_scalars(#20057,0,"100.27")
+yaml(#20057,0,#20042,-4,"tag:yaml.org,2002:float","100.27")
+#20058=@"loc,{#10000},17,18,17,23"
+locations_default(#20058,#10000,17,18,17,23)
+hasLocation(#20057,#20058)
+#20059=*
+yaml_scalars(#20059,0,"quantity")
+yaml(#20059,0,#20042,5,"tag:yaml.org,2002:str","quantity")
+#20060=@"loc,{#10000},18,7,18,14"
+locations_default(#20060,#10000,18,7,18,14)
+hasLocation(#20059,#20060)
+#20061=*
+yaml_scalars(#20061,0,"1")
+yaml(#20061,0,#20042,-5,"tag:yaml.org,2002:int","1")
+#20062=@"loc,{#10000},18,18,18,18"
+locations_default(#20062,#10000,18,18,18,18)
+hasLocation(#20061,#20062)
+yaml(#20042,1,#20023,1,"tag:yaml.org,2002:map","part_no:   E1628")
+#20063=@"loc,{#10000},14,7,20,0"
+locations_default(#20063,#10000,14,7,20,0)
+hasLocation(#20042,#20063)
+yaml(#20023,2,#20000,-4,"tag:yaml.org,2002:seq","- part_no:   A4786")
+#20064=@"loc,{#10000},9,5,20,0"
+locations_default(#20064,#10000,9,5,20,0)
+hasLocation(#20023,#20064)
+#20065=*
+yaml_scalars(#20065,0,"bill-to")
+yaml(#20065,0,#20000,5,"tag:yaml.org,2002:str","bill-to")
+#20066=@"loc,{#10000},20,1,20,7"
+locations_default(#20066,#10000,20,1,20,7)
+hasLocation(#20065,#20066)
+#20067=*
+yaml_anchors(#20067,"id001")
+#20068=*
+yaml_scalars(#20068,0,"street")
+yaml(#20068,0,#20067,1,"tag:yaml.org,2002:str","street")
+#20069=@"loc,{#10000},21,5,21,10"
+locations_default(#20069,#10000,21,5,21,10)
+hasLocation(#20068,#20069)
+#20070=*
+yaml_scalars(#20070,124,"123 Tornado Alley
+Suite 16
+")
+yaml(#20070,0,#20067,-1,"tag:yaml.org,2002:str","|")
+#20071=@"loc,{#10000},21,13,24,0"
+locations_default(#20071,#10000,21,13,24,0)
+hasLocation(#20070,#20071)
+#20072=*
+yaml_scalars(#20072,0,"city")
+yaml(#20072,0,#20067,2,"tag:yaml.org,2002:str","city")
+#20073=@"loc,{#10000},24,5,24,8"
+locations_default(#20073,#10000,24,5,24,8)
+hasLocation(#20072,#20073)
+#20074=*
+yaml_scalars(#20074,0,"East Centerville")
+yaml(#20074,0,#20067,-2,"tag:yaml.org,2002:str","East Centerville")
+#20075=@"loc,{#10000},24,13,24,28"
+locations_default(#20075,#10000,24,13,24,28)
+hasLocation(#20074,#20075)
+#20076=*
+yaml_scalars(#20076,0,"state")
+yaml(#20076,0,#20067,3,"tag:yaml.org,2002:str","state")
+#20077=@"loc,{#10000},25,5,25,9"
+locations_default(#20077,#10000,25,5,25,9)
+hasLocation(#20076,#20077)
+#20078=*
+yaml_scalars(#20078,0,"KS")
+yaml(#20078,0,#20067,-3,"tag:yaml.org,2002:str","KS")
+#20079=@"loc,{#10000},25,13,25,14"
+locations_default(#20079,#10000,25,13,25,14)
+hasLocation(#20078,#20079)
+yaml(#20067,1,#20000,-5,"tag:yaml.org,2002:map","&id001")
+#20080=@"loc,{#10000},20,11,27,0"
+locations_default(#20080,#10000,20,11,27,0)
+hasLocation(#20067,#20080)
+#20081=*
+yaml_scalars(#20081,0,"ship-to")
+yaml(#20081,0,#20000,6,"tag:yaml.org,2002:str","ship-to")
+#20082=@"loc,{#10000},27,1,27,7"
+locations_default(#20082,#10000,27,1,27,7)
+hasLocation(#20081,#20082)
+#20083=*
+yaml_aliases(#20083,"id001")
+yaml(#20083,3,#20000,-6,"","*id001")
+#20084=@"loc,{#10000},27,11,27,16"
+locations_default(#20084,#10000,27,11,27,16)
+hasLocation(#20083,#20084)
+#20085=*
+yaml_scalars(#20085,0,"specialDelivery")
+yaml(#20085,0,#20000,7,"tag:yaml.org,2002:str","specialDelivery")
+#20086=@"loc,{#10000},29,1,29,15"
+locations_default(#20086,#10000,29,1,29,15)
+hasLocation(#20085,#20086)
+#20087=*
+yaml_scalars(#20087,62,"Follow the Yellow Brick Road to the Emerald City. Pay no attention to the man behind the curtain.")
+yaml(#20087,0,#20000,-7,"tag:yaml.org,2002:str",">")
+#20088=@"loc,{#10000},29,19,33,27"
+locations_default(#20088,#10000,29,19,33,27)
+hasLocation(#20087,#20088)
+yaml(#20000,1,#10000,0,"tag:yaml.org,2002:map","receipt ... Invoice")
+#20089=@"loc,{#10000},2,1,33,27"
+locations_default(#20089,#10000,2,1,33,27)
+hasLocation(#20000,#20089)
+numlines(#10000,33,0,0)
+filetype(#10000,"yaml")
diff --git a/javascript/extractor/util/dotify-cfg.sh b/javascript/extractor/util/dotify-cfg.sh
new file mode 100755
index 00000000000..b98e1e54f30
--- /dev/null
+++ b/javascript/extractor/util/dotify-cfg.sh
@@ -0,0 +1,22 @@
+#!/bin/bash
+
+# Given a trap file, extract the CFG and format it as a DOT digraph
+
+echo "digraph {"
+
+# Iterate over all tuples in the trap file.
+#
+# For tuples of the form `<tablename>(#id, ..., "text")`, record
+# "text (#id)" as a human-readable label for #id. As a special case,
+# for tuples of the form `guard_node(#id1, <outcome>, #id2)` we
+# record "#id2 is <outcome> (#id1)" as a human-readable label for #id1.
+#
+# For tuples of the form `successor(#id1, #id2)`, we output an
+# edge from a node labelled with the human-readable label for #id1
+# to a node labelled with the human-readable label for #id2. If no
+# labels have been recorded for either #id1 or #id2, the numeric
+# ids are used instead.
+
+perl -lne 'print "  " . ($labels[$1] || $1) . " -> " . ($labels[$2] || $2) . ";" if /successor\(#(\d+),#(\d+)\)/; $labels[$1] = "$2 (#$1)\"" if /^\w+\(#(\d+),.*,(".*)"\)$/; $labels[$1] = "\"#$3 is $2 (#$1)\"" if /^guard_node\(#(\d+),(\w+),#(\d+)\)$/;' $1 | sed 's/\\/\\\\/g'
+
+echo "}"