AST class reference
===================

Statement classes
-----------------

This table lists subclasses of `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__ representing ECMAScript and TypeScript statements.

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| Statement syntax                                                                                                                                                                                                                                                                                                                                                                                                                            | QL class                                                                                                                                                         | Superclasses                                                                                                                                                                                                                                                                                                                                                                                                             | Remarks                                                                                                                                                                                           |
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| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__  ``;``                                                                                                                                                                                                                                                                                                                                   | `ExprStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ExprStmt.html>`__                                                       |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| `Label <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Label.html>`__ ``:`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                                                                                                                                                               | `LabeledStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LabeledStmt.html>`__                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``;``                                                                                                                                                                                                                                                                                                                                                                                                                                       | `EmptyStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$EmptyStmt.html>`__                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``break`` `Label <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Label.html>`__ ``;``                                                                                                                                                                                                                                                                                                                        | `BreakStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$BreakStmt.html>`__                                                     | `JumpStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$JumpStmt.html>`__, `BreakOrContinueStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$BreakOrContinueStmt.html>`__                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``case`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``:`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__...                                                                                                                                                                                                                     | `Case <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Case.html>`__                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                          | can only occur as child of a `SwitchStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$SwitchStmt.html>`__                                                       |
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| ``catch(`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``)`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                                                                                           | `CatchClause <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$CatchClause.html>`__                                                 | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__                                                                                                                                                                                                                                                                                                         | can only occur as child of a `TryStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$TryStmt.html>`__                                                             |
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| ``class`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``extends`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``{`` `MemberDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$MemberDeclaration.html>`__... ``}``                                                   | `ClassDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$ClassDeclStmt.html>`__                                       | `ClassDefinition <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$ClassDefinition.html>`__, `ClassOrInterface <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$ClassOrInterface.html>`__, `TypeParameterized <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$TypeParameterized.html>`__               |                                                                                                                                                                                                   |
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| ``const`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                     | `ConstDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ConstDeclStmt.html>`__                                             | `DeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DeclStmt.html>`__                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                   |
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| ``continue`` `Label <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Label.html>`__ ``;``                                                                                                                                                                                                                                                                                                                     | `ContinueStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ContinueStmt.html>`__                                               | `JumpStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$JumpStmt.html>`__, `BreakOrContinueStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$BreakOrContinueStmt.html>`__                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``debugger;``                                                                                                                                                                                                                                                                                                                                                                                                                               | `DebuggerStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DebuggerStmt.html>`__                                               |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``declare`` ``global`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                                                                                                                                                                                                    | `GlobalAugmentationDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$GlobalAugmentationDeclaration.html>`__ |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``declare`` ``module`` `StringLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StringLiteral.html>`__ ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                                                                               | `ExternalModuleDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$ExternalModuleDeclaration.html>`__         |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``default:`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__...                                                                                                                                                                                                                                                                                                                          | `Case <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Case.html>`__                                                               |                                                                                                                                                                                                                                                                                                                                                                                                                          | can only occur as child of a `SwitchStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$SwitchStmt.html>`__; use `isDefault` to distinguish `default` from `case` |
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| ``do`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__ ``while`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)``                                                                                                                                                                                                          | `DoWhileStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DoWhileStmt.html>`__                                                 | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__, `LoopStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LoopStmt.html>`__                                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``enum`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``{`` `MemberDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$MemberDeclaration.html>`__... ``}``                                                                                                                                                                   | `EnumDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$EnumDeclaration.html>`__                             | `NamespaceDefinition <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$NamespaceDefinition.html>`__                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``export * from`` `StringLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StringLiteral.html>`__                                                                                                                                                                                                                                                                                                      | `BulkReExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$BulkReExportDeclaration.html>`__       | `ReExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ReExportDeclaration.html>`__, `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                       |                                                                                                                                                                                                   |
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| ``export default`` `ClassDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$ClassDeclStmt.html>`__                                                                                                                                                                                                                                                                                               | `ExportDefaultDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDefaultDeclaration.html>`__     | `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                   |
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| ``export default`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                                                                                                                                 | `ExportDefaultDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDefaultDeclaration.html>`__     | `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                   |
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| ``export default`` `FunctionDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$FunctionDeclStmt.html>`__                                                                                                                                                                                                                                                                                               | `ExportDefaultDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDefaultDeclaration.html>`__     | `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                   |
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| ``export {`` `ExportSpecifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportSpecifier.html>`__... ``};``                                                                                                                                                                                                                                                                           | `ExportNamedDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportNamedDeclaration.html>`__         | `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                   |
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| ``export`` `DeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DeclStmt.html>`__                                                                                                                                                                                                                                                                                                                       | `ExportNamedDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportNamedDeclaration.html>`__         | `ExportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ExportDeclaration.html>`__                                                                                                                                                                                                                                                                           |                                                                                                                                                                                                   |
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| ``export`` ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                                                                                                                                   | `ExportAssignDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$ExportAssignDeclaration.html>`__             |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``export`` ``as`` ``namespace`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``;``                                                                                                                                                                                                                                                                                        | `ExportAsNamespaceDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$ExportAsNamespaceDeclaration.html>`__   |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``for`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__ | `ForStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ForStmt.html>`__                                                         | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__, `LoopStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LoopStmt.html>`__                                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``for`` ``(`` `VarAccess <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarAccess.html>`__ ``in`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                     | `ForInStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ForInStmt.html>`__                                                     | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__, `LoopStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LoopStmt.html>`__, `EnhancedForLoop <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$EnhancedForLoop.html>`__                                                                   |                                                                                                                                                                                                   |
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| ``for`` ``(`` `VarAccess <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarAccess.html>`__ ``of`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                     | `ForOfStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ForOfStmt.html>`__                                                     | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__, `LoopStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LoopStmt.html>`__, `EnhancedForLoop <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$EnhancedForLoop.html>`__                                                                   |                                                                                                                                                                                                   |
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| ``function`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``(`` `Parameter <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$Parameter.html>`__... ``)`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                         | `FunctionDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$FunctionDeclStmt.html>`__                                       | `Function <https://help.semmle.com/qldoc/javascript/semmle/javascript/Functions.qll/type.Functions$Function.html>`__                                                                                                                                                                                                                                                                                                     |                                                                                                                                                                                                   |
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| ``if`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__ ``else`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                                        | `IfStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$IfStmt.html>`__                                                           | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                   |
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| ``import {`` `ImportSpecifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ImportSpecifier.html>`__... ``from`` `StringLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StringLiteral.html>`__                                                                                                                                                    | `ImportDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/ES2015Modules.qll/type.ES2015Modules$ImportDeclaration.html>`__                   | `Import <https://help.semmle.com/qldoc/javascript/semmle/javascript/Modules.qll/type.Modules$Import.html>`__                                                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``import`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                    | `ImportEqualsDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$ImportEqualsDeclaration.html>`__             |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
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| ``interface`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``{`` `MemberDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$MemberDeclaration.html>`__... ``}``                                                                                                                                                              | `InterfaceDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$InterfaceDeclaration.html>`__                   | `InterfaceDefinition <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$InterfaceDefinition.html>`__, `ClassOrInterface <https://help.semmle.com/qldoc/javascript/semmle/javascript/Classes.qll/type.Classes$ClassOrInterface.html>`__, `TypeParameterized <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$TypeParameterized.html>`__ |                                                                                                                                                                                                   |
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| ``let`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                       | `LetStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LetStmt.html>`__                                                         | `DeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DeclStmt.html>`__                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                   |
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| ``namespace`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                                                                                              | `NamespaceDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$NamespaceDeclaration.html>`__                   | `NamespaceDefinition <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$NamespaceDefinition.html>`__                                                                                                                                                                                                                                                                             |                                                                                                                                                                                                   |
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| ``return`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                                                                                                                                         | `ReturnStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ReturnStmt.html>`__                                                   | `JumpStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$JumpStmt.html>`__                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``switch`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``) {`` `Case <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Case.html>`__... ``}``                                                                                                                                                                                                     | `SwitchStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$SwitchStmt.html>`__                                                   | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``throw`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                                                                                                                                          | `ThrowStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ThrowStmt.html>`__                                                     | `JumpStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$JumpStmt.html>`__                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``try`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}`` `CatchClause <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$CatchClause.html>`__... ``finally`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                 | `TryStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$TryStmt.html>`__                                                         | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``type`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``=`` `TypeExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$TypeExpr.html>`__ ``;``                                                                                                                                                                                  | `TypeAliasDeclaration <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$TypeAliasDeclaration.html>`__                   | `TypeParameterized <https://help.semmle.com/qldoc/javascript/semmle/javascript/TypeScript.qll/type.TypeScript$TypeParameterized.html>`__                                                                                                                                                                                                                                                                                 |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``var`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``;``                                                                                                                                                                                                       | `VarDeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$VarDeclStmt.html>`__                                                 | `DeclStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$DeclStmt.html>`__                                                                                                                                                                                                                                                                                                               |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``while`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                                                                                                                                                 | `WhileStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$WhileStmt.html>`__                                                     | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__, `LoopStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$LoopStmt.html>`__                                                                                                                                                                                             |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``with`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__                                                                                                                                                                                                                  | `WithStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$WithStmt.html>`__                                                       | `ControlStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$ControlStmt.html>`__                                                                                                                                                                                                                                                                                                         |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                                                                                                                                                                                                                           | `BlockStmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$BlockStmt.html>`__                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                          |                                                                                                                                                                                                   |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Expression classes
------------------

There is a large number of expression classes, so we present them by category. All classes in this section are subclasses of `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__, except where noted otherwise.

Literals
~~~~~~~~

All classes in this subsection are subclasses of `Literal <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Literal.html>`__.

+-------------------+------------------------------------------------------------------------------------------------------------------------+
| Expression syntax | QL class                                                                                                               |
+===================+========================================================================================================================+
| ``true``          | `BooleanLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$BooleanLiteral.html>`__ |
+-------------------+------------------------------------------------------------------------------------------------------------------------+
| ``23``            | `NumberLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NumberLiteral.html>`__   |
+-------------------+------------------------------------------------------------------------------------------------------------------------+
| ``4.2``           | `NumberLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NumberLiteral.html>`__   |
+-------------------+------------------------------------------------------------------------------------------------------------------------+
| ``"Hello"``       | `StringLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StringLiteral.html>`__   |
+-------------------+------------------------------------------------------------------------------------------------------------------------+
| ``/ab*c?/``       | `RegExpLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$RegExpLiteral.html>`__   |
+-------------------+------------------------------------------------------------------------------------------------------------------------+
| ``null``          | `NullLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NullLiteral.html>`__       |
+-------------------+------------------------------------------------------------------------------------------------------------------------+

Identifiers
~~~~~~~~~~~

All identifiers are represented by the QL class `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__, which has subclasses to represent specific kinds of identifiers:

- `VarAccess <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarAccess.html>`__: an identifier that refers to a variable
- `VarDecl <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarDecl.html>`__: an identifier that declares a variable, for example ``x`` in ``var x = "hi"`` or in ``function(x) { }``
- `VarRef <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarRef.html>`__: a `VarAccess <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarAccess.html>`__ or a `VarDecl <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$VarDecl.html>`__
- `Label <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Label.html>`__: an identifier that refers to a statement label or a property, not a variable; in the following examples, ``l`` and ``p`` are labels:

  - ``break l;``
  - ``l: for(;;) {}``
  - ``x.p``
  - ``{ p: 42 }``


Primary expressions
~~~~~~~~~~~~~~~~~~~

All classes in this subsection are subclasses of `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__.

+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                                                                                    | QL class                                                                                                                                 | Superclasses                                                                                                         | Remarks                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
+======================================================================================================================================================================================================================================================================+==========================================================================================================================================+======================================================================================================================+================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================================+
| ``this``                                                                                                                                                                                                                                                             | `ThisExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ThisExpr.html>`__                               |                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``[`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__... ``]``                                                                                                                                                    | `ArrayExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ArrayExpr.html>`__                             |                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``{`` `Property <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Property.html>`__... ``}``                                                                                                                                            | `ObjectExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ObjectExpr.html>`__                           |                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``function`` ``(`` `Parameter <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$Parameter.html>`__... ``)`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}`` | `FunctionExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$FunctionExpr.html>`__                       | `Function <https://help.semmle.com/qldoc/javascript/semmle/javascript/Functions.qll/type.Functions$Function.html>`__ |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``(`` `Parameter <https://help.semmle.com/qldoc/javascript/semmle/javascript/Variables.qll/type.Variables$Parameter.html>`__... ``)`` ``=>`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__                      | `ArrowFunctionExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ArrowFunctionExpr.html>`__             | `Function <https://help.semmle.com/qldoc/javascript/semmle/javascript/Functions.qll/type.Functions$Function.html>`__ |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``)``                                                                                                                                                       | `ParExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ParExpr.html>`__                                 |                                                                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ````` ... `````                                                                                                                                                                                                                                                      | `TemplateLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TemplateLiteral.html>`__       |                                                                                                                      | an element in a `TemplateLiteral <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TemplateLiteral.html>`__ is either a `TemplateElement <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TemplateElement.html>`__ representing a constant template element, or some other expression representing an interpolated expression of the form ``${`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``}``       |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ````` ... `````                                                                                                                                                   | `TaggedTemplateExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TaggedTemplateExpr.html>`__ |                                                                                                                      | an element in a `TaggedTemplateExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TaggedTemplateExpr.html>`__ is either a `TemplateElement <https://help.semmle.com/qldoc/javascript/semmle/javascript/Templates.qll/type.Templates$TemplateElement.html>`__ representing a constant template element, or some other expression representing an interpolated expression of the form ``${`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``}`` |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Properties
~~~~~~~~~~

All classes in this subsection are subclasses of `Property <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Property.html>`__. Note that `Property <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Property.html>`__ is not a subclass of `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__.

+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------+
| Property syntax                                                                                                                                                                                                                                                                                                                                                     | QL class                                                                                                               | Superclasses                                                                                                               |
+=====================================================================================================================================================================================================================================================================================================================================================================+========================================================================================================================+============================================================================================================================+
| `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``:`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__                                                                                                                                             | `ValueProperty <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ValueProperty.html>`__   |                                                                                                                            |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------+
| ``get`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``()`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}``                                                                                                                     | `PropertyGetter <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PropertyGetter.html>`__ | `PropertyAccessor <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PropertyAccessor.html>`__ |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------+
| ``set`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``(`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ ``)`` ``{`` `Stmt <https://help.semmle.com/qldoc/javascript/semmle/javascript/Stmt.qll/type.Stmt$Stmt.html>`__... ``}`` | `PropertySetter <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PropertySetter.html>`__ | `PropertyAccessor <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PropertyAccessor.html>`__ |
+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------------+

Property accesses
~~~~~~~~~~~~~~~~~

All classes in this subsection are subclasses of `PropAccess <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PropAccess.html>`__.

+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                                       | QL class                                                                                                     |
+=========================================================================================================================================================================================================================+==============================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``.`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__ | `DotExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$DotExpr.html>`__     |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``[`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``]``       | `IndexExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$IndexExpr.html>`__ |
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------+

Function calls and ``new``
~~~~~~~~~~~~~~~~~~~~~~~~~~

All classes in this subsection are subclasses of `InvokeExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$InvokeExpr.html>`__.

+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                                                                                                                                                          | QL class                                                                                                               | Remarks                                                                                                                                                                                                                                                                                                                                                                  |
+============================================================================================================================================================================================================================================================================================================================================+========================================================================================================================+==========================================================================================================================================================================================================================================================================================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__... ``)``                                                                                                                       | `CallExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CallExpr.html>`__             |                                                                                                                                                                                                                                                                                                                                                                          |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``.`` `Identifier <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Identifier.html>`__  ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__... ``)`` | `MethodCallExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$MethodCallExpr.html>`__ | this also includes calls of the form `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``[`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``]`` ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__... ``)`` |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| ``new`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``(`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__... ``)``                                                                                                               | `NewExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NewExpr.html>`__               |                                                                                                                                                                                                                                                                                                                                                                          |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Unary expressions
~~~~~~~~~~~~~~~~~

All classes in this subsection are subclasses of `UnaryExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$UnaryExpr.html>`__.

+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                             | QL class                                                                                                             |
+===============================================================================================================+======================================================================================================================+
| ``~`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__      | `BitNotExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$BitNotExpr.html>`__       |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``-`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__      | `NegExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NegExpr.html>`__             |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``+`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__      | `PlusExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PlusExpr.html>`__           |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``!`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__      | `LogNotExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LogNotExpr.html>`__       |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``typeof`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `TypeofExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$TypeofExpr.html>`__       |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``void`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `VoidExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$VoidExpr.html>`__           |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``delete`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `DeleteExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$DeleteExpr.html>`__       |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+
| ``...`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__    | `SpreadElement <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$SpreadElement.html>`__ |
+---------------------------------------------------------------------------------------------------------------+----------------------------------------------------------------------------------------------------------------------+

Binary expressions
~~~~~~~~~~~~~~~~~~

All classes in this subsection are subclasses of `BinaryExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$BinaryExpr.html>`__.

+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                                    | QL class                                                                                                               | Superclasses                                                                                                                                                                                                                       |
+======================================================================================================================================================================================================================+========================================================================================================================+====================================================================================================================================================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``*`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `MulExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$MulExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``/`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `DivExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$DivExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``%`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `ModExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ModExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``**`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `ExpExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ExpExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``+`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `AddExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AddExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``-`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `SubExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$SubExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``<<`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `LShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LShiftExpr.html>`__         |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>>`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `RShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$RShiftExpr.html>`__         |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>>>`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__        | `URShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$URShiftExpr.html>`__       |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``&&`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `LogAndExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LogAndExpr.html>`__         |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``||`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `LogOrExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LogOrExpr.html>`__           |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``<`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `LTExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LTExpr.html>`__                 | `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__                                                                                                                     |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `GTExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$GTExpr.html>`__                 | `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__                                                                                                                     |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``<=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `LEExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$LEExpr.html>`__                 | `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__                                                                                                                     |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `GEExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$GEExpr.html>`__                 | `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__                                                                                                                     |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``==`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `EqExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$EqExpr.html>`__                 | `EqualityTest <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$EqualityTest.html>`__, `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``!=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `NEqExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$NEqExpr.html>`__               | `EqualityTest <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$EqualityTest.html>`__, `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``===`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__        | `StrictEqExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StrictEqExpr.html>`__     | `EqualityTest <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$EqualityTest.html>`__, `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``!==`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__        | `StrictNEqExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$StrictNEqExpr.html>`__   | `EqualityTest <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$EqualityTest.html>`__, `Comparison <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Comparison.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``&`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `BitAndExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$BitAndExpr.html>`__         |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``|`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `BitOrExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$BitOrExpr.html>`__           |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``^`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__          | `XOrExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$XOrExpr.html>`__               |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``in`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__         | `InExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$InExpr.html>`__                 |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``instanceof`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `InstanceofExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$InstanceofExpr.html>`__ |                                                                                                                                                                                                                                    |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Assignment expressions
~~~~~~~~~~~~~~~~~~~~~~

All classes in this table are subclasses of `Assignment <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Assignment.html>`__.

+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                              | QL class                                                                                                                     | Superclasses                                                                                                                   |
+================================================================================================================================================================================================================+==============================================================================================================================+================================================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__    | `AssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignExpr.html>`__               |                                                                                                                                |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``+=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignAddExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignAddExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``-=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignSubExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignSubExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``*=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignMulExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignMulExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``**=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__  | `AssignExpExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignExpExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``/=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignDivExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignDivExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``%=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignModExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignModExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``&=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignAndExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignAndExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``|=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignOrExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignOrExpr.html>`__           | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``^=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__   | `AssignXOrExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignXOrExpr.html>`__         | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``<<=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__  | `AssignLShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignLShiftExpr.html>`__   | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>>=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__  | `AssignRShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignRShiftExpr.html>`__   | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``>>>=`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `AssignURShiftExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AssignURShiftExpr.html>`__ | `CompoundAssignExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$CompoundAssignExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------------+

Update expressions
~~~~~~~~~~~~~~~~~~

All classes in this table are subclasses of `UpdateExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$UpdateExpr.html>`__.

+-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                         | QL class                                                                                                         |
+===========================================================================================================+==================================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``++`` | `PostIncExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PostIncExpr.html>`__ |
+-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``--`` | `PostDecExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PostDecExpr.html>`__ |
+-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
| ``++`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `PreIncExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PreIncExpr.html>`__   |
+-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+
| ``--`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `PreDecExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$PreDecExpr.html>`__   |
+-----------------------------------------------------------------------------------------------------------+------------------------------------------------------------------------------------------------------------------+

Miscellaneous
~~~~~~~~~~~~~

All classes in this table are subclasses of `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__.

+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+
| Expression syntax                                                                                                                                                                                                                                                                                                    | QL class                                                                                                                 |
+======================================================================================================================================================================================================================================================================================================================+==========================================================================================================================+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``?`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``:`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ | `ConditionalExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$ConditionalExpr.html>`__ |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+
| `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__ ``,`` ... ``,`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__                                                                                                | `SeqExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$SeqExpr.html>`__                 |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+
| ``await`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__                                                                                                                                                                                                         | `AwaitExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$AwaitExpr.html>`__             |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+
| ``yield`` `Expr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$Expr.html>`__                                                                                                                                                                                                         | `YieldExpr <https://help.semmle.com/qldoc/javascript/semmle/javascript/Expr.qll/type.Expr$YieldExpr.html>`__             |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+--------------------------------------------------------------------------------------------------------------------------+