update externs from closure-compiler

2026-05-16 04:09:27 +02:00 · 2021-01-13 13:54:22 +01:00
123 changed files with 23294 additions and 16728 deletions
--- a/javascript/externs/es/es3.js
+++ b/javascript/externs/es/es3.js
@@ -27,26 +27,34 @@

 // START ES6 RETROFIT CODE
 // symbol, Symbol and Symbol.iterator are actually ES6 types but some
-// Some types require them to be part of their definition (such as Array).
+// base types require them to be part of their definition (such as Array).


-// TODO(johnlenz): symbol should be a primitive type.
-/** @typedef {?} */
-var symbol;
-
 /**
- * @param {string=} opt_description
+ * @constructor
+ * @param {*=} opt_description
 * @return {symbol}
+ * @nosideeffects
+ * Note: calling `new Symbol('x');` will always throw, but we mark this
+ * nosideeffects because the compiler does not promise to preserve all coding
+ * errors.
 */
 function Symbol(opt_description) {}


+/**
+ * @const {string|undefined}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/description
+ */
+Symbol.prototype.description;
+
+
 /**
 * @param {string} sym
- * @return {symbol|undefined}
+ * @return {symbol}
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/for
 */
-Symbol.for;
+Symbol.for = function(sym) {};


 /**
@@ -54,18 +62,87 @@ Symbol.for;
 * @return {string|undefined}
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/keyFor
 */
-Symbol.keyFor;
+Symbol.keyFor = function(sym) {};


 // Well known symbols

-/** @const {symbol} */
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/asyncIterator
+ * @const {symbol}
+ */
+Symbol.asyncIterator;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/hasInstance
+ * @const {symbol}
+ */
+Symbol.hasInstance;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/isConcatSpreadable
+ * @const {symbol}
+ */
+Symbol.isConcatSpreadable;
+
+/**
+ * @const {symbol}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/iterator
+ */
 Symbol.iterator;

-/** @const {symbol} */
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/match
+ * @const {symbol}
+ */
+Symbol.match;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/matchAll
+ * @const {symbol}
+ */
+Symbol.matchAll;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/replace
+ * @const {symbol}
+ */
+Symbol.replace;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/search
+ * @const {symbol}
+ */
+Symbol.search;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/species
+ * @const {symbol}
+ */
+Symbol.species;
+
+// /**
+//  * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/split
+//  * @const {symbol}
+//  */
+// Symbol.split;
+
+/**
+ * @const {symbol}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive
+ */
+Symbol.toPrimitive;
+
+/**
+ * @const {symbol}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toStringTag
+ */
 Symbol.toStringTag;

-/** @const {symbol} */
+/**
+ * @const {symbol}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/unscopables
+ */
 Symbol.unscopables;


@@ -89,9 +166,10 @@ IIterableResult.prototype.value;
 */
 function Iterable() {}

-// TODO(johnlenz): remove this when the compiler understands "symbol" natively
+// TODO(johnlenz): remove the suppression when the compiler understands
+// "symbol" natively
 /**
- * @return {Iterator<VALUE>}
+ * @return {!Iterator<VALUE, ?, *>}
 * @suppress {externsValidation}
 */
 Iterable.prototype[Symbol.iterator] = function() {};
@@ -99,23 +177,26 @@ Iterable.prototype[Symbol.iterator] = function() {};


 /**
+ * TODO(b/142881197): UNUSED_RETURN_T and UNUSED_NEXT_T are not yet used for
+ * anything. https://github.com/google/closure-compiler/issues/3489
 * @interface
- * @template VALUE
+ * @template VALUE, UNUSED_RETURN_T, UNUSED_NEXT_T
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/The_Iterator_protocol
 */
 function Iterator() {}

 /**
- * @param {VALUE=} value
+ * @param {?=} opt_value
 * @return {!IIterableResult<VALUE>}
 */
-Iterator.prototype.next;
+Iterator.prototype.next = function(opt_value) {};


 /**
 * Use this to indicate a type is both an Iterator and an Iterable.
+ *
 * @interface
- * @extends {Iterator<T>}
+ * @extends {Iterator<T, ?, *>}
 * @extends {Iterable<T>}
 * @template T
 */
@@ -126,7 +207,7 @@ function IteratorIterable() {}

 /**
 * @interface
- * @template KEY1, VALUE1
+ * @template IOBJECT_KEY, IOBJECT_VALUE
 */
 function IObject() {}

@@ -142,8 +223,8 @@ IArrayLike.prototype.length;

 /**
 * @constructor
- * @implements {IArrayLike<T>}
- * @template T
+ * @implements {IArrayLike<?>}
+ * @implements {Iterable<?>}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions_and_function_scope/arguments
 */
 function Arguments() {}
@@ -170,10 +251,12 @@ Arguments.prototype.caller;
 Arguments.prototype.length;

 /**
- * Not actually a global variable, but we need it in order for the current type
- * checker to typecheck the "arguments" variable in a function correctly.
- * TODO(tbreisacher): When the old type checker is gone, delete this and add
- * an 'arguments' variable of type Array<string> in the d8 externs.
+ * Not actually a global variable, when running in a browser environment. But
+ * we need it in order for the type checker to typecheck the "arguments"
+ * variable in a function correctly.
+ *
+ * TODO(tbreisacher): There should be a separate 'arguments' variable of type
+ * `Array<string>`, in the d8 externs.
 *
 * @type {!Arguments}
 * @see http://developer.mozilla.org/en/Core_JavaScript_1.5_Reference/Functions_and_function_scope/arguments
@@ -204,7 +287,7 @@ var undefined;
 /**
 * @param {string} uri
 * @return {string}
- * @nosideeffects
+ * @throws {URIError} when used wrongly.
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURI
 */
 function decodeURI(uri) {}
@@ -212,7 +295,7 @@ function decodeURI(uri) {}
 /**
 * @param {string} uri
 * @return {string}
- * @nosideeffects
+ * @throws {URIError} when used wrongly.
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/decodeURIComponent
 */
 function decodeURIComponent(uri) {}
@@ -220,7 +303,8 @@ function decodeURIComponent(uri) {}
 /**
 * @param {string} uri
 * @return {string}
- * @nosideeffects
+ * @throws {URIError} if one attempts to encode a surrogate which is not part of
+ * a high-low pair.
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURI
 */
 function encodeURI(uri) {}
@@ -228,7 +312,8 @@ function encodeURI(uri) {}
 /**
 * @param {string} uri
 * @return {string}
- * @nosideeffects
+ * @throws {URIError} if one attempts to encode a surrogate which is not part of
+ * a high-low pair.
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/encodeURIComponent
 */
 function encodeURIComponent(uri) {}
@@ -278,9 +363,9 @@ function isNaN(num) {}
 function parseFloat(num) {}

 /**
- * Parse an integer. Use of {@code parseInt} without {@code base} is strictly
+ * Parse an integer. Use of `parseInt` without `base` is strictly
 * banned in Google. If you really want to parse octal or hex based on the
- * leader, then pass {@code undefined} as the base.
+ * leader, then pass `undefined` as the base.
 *
 * @param {*} num
 * @param {number|undefined} base
@@ -290,8 +375,23 @@ function parseFloat(num) {}
 */
 function parseInt(num, base) {}

+
 /**
- * @param {string} code
+ * Represents a string of JavaScript code that is known to have come from a
+ * trusted source. Part of Trusted Types.
+ *
+ * The main body Trusted Types type definitions reside in the  file
+ * `w3c_trusted_types.js`. This definition was placed here so that it would be
+ * accessible to `eval()`.
+ *
+ * @constructor
+ * @see https://w3c.github.io/webappsec-trusted-types/dist/spec/#trusted-script
+ */
+function TrustedScript() {}
+
+
+/**
+ * @param {string|!TrustedScript} code
 * @return {*}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/eval
 */
@@ -325,6 +425,7 @@ Object.prototype.constructor = function() {};
 * @modifies {this}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineGetter
 * @return {undefined}
+ * @deprecated
 */
 Object.prototype.__defineGetter__ = function(sprop, fun) {};

@@ -338,6 +439,7 @@ Object.prototype.__defineGetter__ = function(sprop, fun) {};
 * @modifies {this}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineSetter
 * @return {undefined}
+ * @deprecated
 */
 Object.prototype.__defineSetter__ = function(sprop, fun) {};

@@ -369,6 +471,7 @@ Object.prototype.isPrototypeOf = function(other) {};
 * getter should be returned
 * @return {Function}
 * @nosideeffects
+ * @deprecated
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/lookupGetter
 */
 Object.prototype.__lookupGetter__ = function(sprop) {};
@@ -381,6 +484,7 @@ Object.prototype.__lookupGetter__ = function(sprop) {};
 *     setter should be returned.
 * @return {Function}
 * @nosideeffects
+ * @deprecated
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/lookupSetter
 */
 Object.prototype.__lookupSetter__ = function(sprop) {};
@@ -391,6 +495,7 @@ Object.prototype.__lookupSetter__ = function(sprop) {};
 *
 * @param {Function} fun
 * @return {*}
+ * @deprecated
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/noSuchMethod
 */
 Object.prototype.__noSuchMethod__ = function(fun) {};
@@ -421,7 +526,7 @@ Object.prototype.__proto__;
 * for..in loop, with the exception of properties inherited through the
 * prototype chain.
 *
- * @param {string} propertyName
+ * @param {string|symbol} propertyName
 * @return {boolean}
 * @nosideeffects
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable
@@ -455,33 +560,13 @@ Object.prototype.toSource = function() {};
 Object.prototype.toString = function() {};

 /**
- * Removes a watchpoint set with the {@see Object.prototype.watch} method.
- * Mozilla-only.
- * @param {string} prop The name of a property of the object.
- * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/unwatch
- * @return {undefined}
- */
-Object.prototype.unwatch = function(prop) {};
-
-/**
- * Returns the object's {@code this} value.
+ * Returns the object's `this` value.
 * @return {*}
 * @nosideeffects
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf
 */
 Object.prototype.valueOf = function() {};

-/**
- * Sets a watchpoint method.
- * Mozilla-only.
- * @param {string} prop The name of a property of the object.
- * @param {Function} handler A function to call.
- * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/watch
- * @return {undefined}
- */
-Object.prototype.watch = function(prop, handler) {};
-
-
 /**
 * @constructor
 * @param {...*} var_args
@@ -554,7 +639,7 @@ Function.prototype.toString = function() {};
 * @implements {IArrayLike<T>}
 * @implements {Iterable<T>}
 * @param {...*} var_args
- * @return {!Array<?>}
+ * @return {!Array}
 * @nosideeffects
 * @template T
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array
@@ -605,11 +690,12 @@ Array.prototype.join = function(opt_separator) {};
 */
 Array.prototype.pop = function() {};

+// TODO(bradfordcsmith): remove "undefined" from the var_args of push
 /**
 * Mutates an array by appending the given elements and returning the new
 * length of the array.
 *
- * @param {...T} var_args
+ * @param {...(T|undefined)} var_args
 * @return {number} The new length of the array.
 * @this {IArrayLike<T>}
 * @template T
@@ -645,9 +731,8 @@ Array.prototype.shift = function() {};
 /**
 * Extracts a section of an array and returns a new array.
 *
- * @param {*=} opt_begin Zero-based index at which to begin extraction.  A
- *     non-number type will be auto-cast by the browser to a number.
- * @param {*=} opt_end Zero-based index at which to end extraction.  slice
+ * @param {?number=} begin Zero-based index at which to begin extraction.
+ * @param {?number=} end Zero-based index at which to end extraction.  slice
 *     extracts up to but not including end.
 * @return {!Array<T>}
 * @this {IArrayLike<T>|string}
@@ -655,12 +740,12 @@ Array.prototype.shift = function() {};
 * @nosideeffects
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/slice
 */
-Array.prototype.slice = function(opt_begin, opt_end) {};
+Array.prototype.slice = function(begin, end) {};

 /**
 * Sorts the elements of an array in place.
 *
- * @param {function(T,T):number=} opt_compareFunction Specifies a function that
+ * @param {function(T,T):number=} opt_compareFn Specifies a function that
 *     defines the sort order.
 * @this {IArrayLike<T>}
 * @template T
@@ -668,17 +753,16 @@ Array.prototype.slice = function(opt_begin, opt_end) {};
 * @return {!Array<T>}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
 */
-Array.prototype.sort = function(opt_compareFunction) {};
+Array.prototype.sort = function(opt_compareFn) {};

 /**
 * Changes the content of an array, adding new elements while removing old
 * elements.
 *
- * @param {*=} opt_index Index at which to start changing the array. If negative,
- *     will begin that many elements from the end.  A non-number type will be
- *     auto-cast by the browser to a number.
- * @param {*=} opt_howMany An integer indicating the number of old array elements
- *     to remove.
+ * @param {?number=} index Index at which to start changing the array. If
+ *     negative, will begin that many elements from the end.
+ * @param {?number=} howMany An integer indicating the number of old array
+ *     elements to remove.
 * @param {...T} var_args
 * @return {!Array<T>}
 * @this {IArrayLike<T>}
@@ -686,7 +770,7 @@ Array.prototype.sort = function(opt_compareFunction) {};
 * @template T
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
 */
-Array.prototype.splice = function(opt_index, opt_howMany, var_args) {};
+Array.prototype.splice = function(index, howMany, var_args) {};

 /**
 * @return {string}
@@ -839,75 +923,6 @@ Array.prototype.input;
 */
 Array.prototype.length;

-/**
- * @param {IArrayLike<T>} arr
- * @param {?function(this:S, T, number, ?) : ?} callback
- * @param {S=} opt_context
- * @return {boolean}
- * @template T,S
- */
-Array.every = function(arr, callback, opt_context) {};
-
-/**
- * @param {IArrayLike<T>} arr
- * @param {?function(this:S, T, number, ?) : ?} callback
- * @param {S=} opt_context
- * @return {!Array<T>}
- * @template T,S
- */
-Array.filter = function(arr, callback, opt_context) {};
-
-/**
- * @param {IArrayLike<T>} arr
- * @param {?function(this:S, T, number, ?) : ?} callback
- * @param {S=} opt_context
- * @template T,S
- * @return {undefined}
- */
-Array.forEach = function(arr, callback, opt_context) {};
-
-/**
- * Mozilla 1.6+ only.
- * @param {IArrayLike<T>} arr
- * @param {T} obj
- * @param {number=} opt_fromIndex
- * @return {number}
- * @template T
- * @nosideeffects
- * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
- */
-Array.indexOf = function(arr, obj, opt_fromIndex) {};
-
-/**
- * Mozilla 1.6+ only.
- * @param {IArrayLike<T>} arr
- * @param {T} obj
- * @param {number=} opt_fromIndex
- * @return {number}
- * @template T
- * @nosideeffects
- * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/lastIndexOf
- */
-Array.lastIndexOf = function(arr, obj, opt_fromIndex) {};
-
-/**
- * @param {IArrayLike<T>} arr
- * @param {?function(this:S, T, number, !Array<T>): R} callback
- * @param {S=} opt_context
- * @return {!Array<R>}
- * @template T,S,R
- */
-Array.map = function(arr, callback, opt_context) {};
-
-/**
- * @param {IArrayLike<T>} arr
- * @param {?function(this:S, T, number, ?) : ?} callback
- * @param {S=} opt_context
- * @return {boolean}
- * @template T,S
- */
-Array.some = function(arr, callback, opt_context) {};
-
 /**
 * Introduced in 1.8.5.
 * @param {*} arr
@@ -999,35 +1014,97 @@ Number.prototype.toString = function(opt_radix) {};

 // Properties.
 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MAX_VALUE
 */
 Number.MAX_VALUE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/MIN_VALUE
 */
 Number.MIN_VALUE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/NaN
 */
 Number.NaN;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/NEGATIVE_INFINITY
 */
 Number.NEGATIVE_INFINITY;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/POSITIVE_INFINITY
 */
 Number.POSITIVE_INFINITY;

+/**
+ * @constructor
+ * @param {number|string|bigint} arg
+ * @return {bigint}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt
+ */
+function BigInt(arg) {}
+
+/**
+ * Wraps a BigInt value to a signed integer between -2^(width-1) and
+ * 2^(width-1)-1.
+ * @param {number} width
+ * @param {bigint} bigint
+ * @return {bigint}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asIntN
+ */
+BigInt.asIntN = function(width, bigint) {};
+
+/**
+ * Wraps a BigInt value to an unsigned integer between 0 and (2^width)-1.
+ * @param {number} width
+ * @param {bigint} bigint
+ * @return {bigint}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/asUintN
+ */
+BigInt.asUintN = function(width, bigint) {};
+
+/**
+ * Returns a string with a language-sensitive representation of this BigInt.
+ * @param {string|!Array<string>=} locales
+ * @param {Object=} options
+ * @return {string}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/toLocaleString
+ * @override
+ */
+BigInt.prototype.toLocaleString = function(locales, options) {};
+
+/**
+ * Returns a string representing the specified BigInt object. The trailing "n"
+ * is not part of the string.
+ * @this {BigInt|bigint}
+ * @param {number=} radix
+ * @return {string}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/toString
+ * @override
+ */
+BigInt.prototype.toString = function(radix) {};
+
+/**
+ * Returns the wrapped primitive value of a BigInt object.
+ * @return {bigint}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt/valueOf
+ * @override
+ */
+BigInt.prototype.valueOf = function() {};
+

 /**
 * @const
@@ -1190,49 +1267,49 @@ Math.toSource = function() {};
 // Properties:

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/E
 */
 Math.E;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/LN2
 */
 Math.LN2;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/LN10
 */
 Math.LN10;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/LOG2E
 */
 Math.LOG2E;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/LOG10E
 */
 Math.LOG10E;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/PI
 */
 Math.PI;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/SQRT1_2
 */
 Math.SQRT1_2;

 /**
- * @type {number}
+ * @const {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/SQRT2
 */
 Math.SQRT2;
@@ -1696,6 +1773,7 @@ Date.prototype.valueOf;

 /**
 * @constructor
+ * @implements {Iterable<string>}
 * @param {*=} opt_str
 * @return {string}
 * @nosideeffects
@@ -1891,24 +1969,23 @@ String.prototype.quote = function() {};
 * This may have side-effects if the replacement function has side-effects.
 *
 * @this {String|string}
- * @param {RegExp|string} regex
- * @param {string|Function} str
- * @param {string=} opt_flags
+ * @param {RegExp|string} pattern
+ * @param {?string|function(string, ...?):*} replacement
 * @return {string}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace
 */
-String.prototype.replace = function(regex, str, opt_flags) {};
+String.prototype.replace = function(pattern, replacement) {};

 /**
 * Executes the search for a match between a regular expression and this String
 * object.
 *
 * @this {String|string}
- * @param {RegExp|string} regexp
+ * @param {RegExp|string} pattern
 * @return {number}
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/search
 */
-String.prototype.search = function(regexp) {};
+String.prototype.search = function(pattern) {};

 /**
 * @this {String|string}
@@ -1983,19 +2060,21 @@ String.prototype.sup = function() {};

 /**
 * @this {String|string}
+ * @param {(string|Array<string>)=} opt_locales
 * @return {string}
 * @nosideeffects
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLocaleUpperCase
 */
-String.prototype.toLocaleUpperCase = function() {};
+String.prototype.toLocaleUpperCase = function(opt_locales) {};

 /**
 * @this {String|string}
+ * @param {(string|Array<string>)=} opt_locales
 * @return {string}
 * @nosideeffects
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toLocaleLowerCase
 */
-String.prototype.toLocaleLowerCase = function() {};
+String.prototype.toLocaleLowerCase = function(opt_locales) {};

 /**
 * @this {String|string}
@@ -2047,7 +2126,7 @@ String.prototype.length;
 * @param {*=} opt_pattern
 * @param {*=} opt_flags
 * @return {!RegExp}
- * @nosideeffects
+ * @throws {SyntaxError} if opt_pattern is an invalid pattern.
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
 */
 function RegExp(opt_pattern, opt_flags) {}
@@ -2065,9 +2144,7 @@ RegExp.prototype.compile = function(pattern, opt_flags) {};

 /**
 * @param {*} str The string to search.
- * @return {Array<string>} This should really return an Array with a few
- *     special properties, but we do not have a good way to model this in
- *     our type system. Also see String.prototype.match.
+ * @return {?RegExpResult}
 * @see http://msdn.microsoft.com/en-us/library/z908hy33(VS.85).aspx
 * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec
 */
@@ -2088,6 +2165,34 @@ RegExp.prototype.test = function(str) {};
 */
 RegExp.prototype.toString = function() {};

+/**
+ * @constructor
+ * @extends {Array<string>}
+ */
+var RegExpResult = function() {};
+
+
+/** @type {number} */
+RegExpResult.prototype.index;
+
+
+/** @type {string} */
+RegExpResult.prototype.input;
+
+
+/** @type {number} */
+RegExpResult.prototype.length;
+
+
+/**
+ * Not actually part of ES3; was added in 2018.
+ * https://github.com/tc39/proposal-regexp-named-groups
+ *
+ * @type {!Object<string, string>}
+ */
+RegExpResult.prototype.groups;
+
+
 // Constructor properties:

 /**
@@ -2195,6 +2300,13 @@ RegExp.prototype.ignoreCase;
 */
 RegExp.prototype.lastIndex;

+/**
+ * Whether or not the regular expression uses lastIndex.
+ * @type {boolean}
+ * @see http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/sticky
+ */
+RegExp.prototype.sticky;
+
 /**
 * Whether or not to search in strings across multiple lines.
 * @type {boolean}
@@ -2209,6 +2321,12 @@ RegExp.prototype.multiline;
 */
 RegExp.prototype.source;

+/**
+ * The flags the regex was created with.
+ * @type {string}
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/flags
+ */
+RegExp.prototype.flags;

 /**
 * @constructor
@@ -2359,40 +2477,12 @@ function TypeError(opt_message, opt_file, opt_line) {}
 */
 function URIError(opt_message, opt_file, opt_line) {}

-
 // JScript extensions.
 // @see http://msdn.microsoft.com/en-us/library/894hfyb4(VS.80).aspx

 /**
 * @see http://msdn.microsoft.com/en-us/library/7sw4ddf8.aspx
 * @type {function(new:?, string, string=)}
+ * @deprecated
 */
 function ActiveXObject(progId, opt_location) {}
-
-/**
- * @return {string}
- * @nosideeffects
- * @see http://msdn.microsoft.com/en-us/library/9k34bww2(VS.80).aspx
- */
-function ScriptEngine() {}
-
-/**
- * @return {number}
- * @nosideeffects
- * @see http://msdn.microsoft.com/en-us/library/yf25ky07(VS.80).aspx
- */
-function ScriptEngineMajorVersion() {}
-
-/**
- * @return {number}
- * @nosideeffects
- * @see http://msdn.microsoft.com/en-us/library/wx3812cz(VS.80).aspx
- */
-function ScriptEngineMinorVersion() {}
-
-/**
- * @return {number}
- * @nosideeffects
- * @see http://msdn.microsoft.com/en-us/library/e98hsk2f(VS.80).aspx
- */
-function ScriptEngineBuildVersion() {}
--- a/javascript/externs/es/es5.js
+++ b/javascript/externs/es/es5.js
@@ -22,9 +22,9 @@


 /**
- * @param {Object|undefined} selfObj Specifies the object to which |this| should
- *     point when the function is run. If the value is null or undefined, it
- *     will default to the global object.
+ * @param {?Object|undefined} selfObj Specifies the object to which |this|
+ *     should point when the function is run. If the value is null or undefined,
+ *     it will default to the global object.
 * @param {...*} var_args Additional arguments that are partially
 *     applied to fn.
 * @return {!Function} A partially-applied form of the Function on which
@@ -66,13 +66,12 @@ String.prototype.trimRight = function() {};
 * A object property descriptor used by Object.create, Object.defineProperty,
 * Object.defineProperties, Object.getOwnPropertyDescriptor.
 *
- * Note: not a real constructor.
- * @constructor
+ * @record
 * @template THIS
 */
 function ObjectPropertyDescriptor() {}

-/** @type {*} */
+/** @type {(*|undefined)} */
 ObjectPropertyDescriptor.prototype.value;

 /** @type {(function(this: THIS):?)|undefined} */
@@ -92,29 +91,33 @@ ObjectPropertyDescriptor.prototype.configurable;


 /**
- * @param {Object} proto
- * @param {Object=} opt_properties  A map of ObjectPropertyDescriptors.
+ * @param {?Object} proto
+ * @param {?Object<string|symbol, !ObjectPropertyDescriptor<?>>=} properties
+ *     A map of ObjectPropertyDescriptors.
 * @return {!Object}
 * @nosideeffects
 * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/create
 */
-Object.create = function(proto, opt_properties) {};
+Object.create = function(proto, properties) {};


 /**
- * @param {!Object} obj
- * @param {string} prop
- * @param {!Object} descriptor A ObjectPropertyDescriptor.
- * @return {!Object}
+ * @template T
+ * @param {T} obj
+ * @param {string|symbol} prop
+ * @param {!ObjectPropertyDescriptor<T>} descriptor A ObjectPropertyDescriptor.
+ * @return {T}
 * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/defineProperty
 */
 Object.defineProperty = function(obj, prop, descriptor) {};


 /**
- * @param {!Object} obj
- * @param {!Object} props A map of ObjectPropertyDescriptors.
- * @return {!Object}
+ * @template T
+ * @param {T} obj
+ * @param {!Object<string|symbol, !ObjectPropertyDescriptor<T>>} props A map of
+ *     ObjectPropertyDescriptors.
+ * @return {T}
 * @see https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/defineProperties
 */
 Object.defineProperties = function(obj, props) {};
@@ -122,7 +125,7 @@ Object.defineProperties = function(obj, props) {};

 /**
 * @param {T} obj
- * @param {string} prop
+ * @param {string|symbol} prop
 * @return {!ObjectPropertyDescriptor<T>|undefined}
 * @nosideeffects
 * @template T
@@ -213,10 +216,20 @@ Object.isFrozen = function(obj) {};


 /**
+ * We acknowledge that this function does not exist on the `Object.prototype`
+ * and is declared in this file for other reasons.
+ *
+ * When `toJSON` is defined as a property on an object it can be used in
+ * conjunction with the JSON.stringify() function.
+ *
+ * It is defined here to:
+ * (1) Prevent the compiler from renaming the property on internal classes.
+ * (2) Enforce that the signature is correct for users defining it.
+ *
 * @param {string=} opt_key The JSON key for this object.
 * @return {*} The serializable representation of this object. Note that this
 *     need not be a string. See http://goo.gl/PEUvs.
- * @see https://es5.github.io/#x15.12.3
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#toJSON()_behavior
 */
 Object.prototype.toJSON = function(opt_key) {};

@@ -238,7 +251,7 @@ Date.prototype.toJSON = function(opt_ignoredKey) {};

 /**
 * @param {string} jsonStr The string to parse.
- * @param {(function(string, *) : *)=} opt_reviver
+ * @param {(function(this:?, string, *) : *)=} opt_reviver
 * @return {*} The JSON object.
 * @throws {Error}
 */
@@ -247,7 +260,7 @@ JSON.parse = function(jsonStr, opt_reviver) {};

 /**
 * @param {*} jsonObj Input object.
- * @param {(Array<string>|(function(string, *) : *)|null)=} opt_replacer
+ * @param {(Array<string>|(function(this:?, string, *) : *)|null)=} opt_replacer
 * @param {(number|string)=} opt_space
 * @return {string} JSON string which represents jsonObj.
 * @throws {Error}
--- a/javascript/externs/es/es6.js
+++ b/javascript/externs/es/es6.js
--- a/javascript/externs/es/es6_collections.js
+++ b/javascript/externs/es/es6_collections.js
@@ -27,24 +27,25 @@
 * @param {Iterable<!Array<KEY|VALUE>>|!Array<!Array<KEY|VALUE>>=} opt_iterable
 * @implements {Iterable<!Array<KEY|VALUE>>}
 * @template KEY, VALUE
+ * @nosideeffects
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
 */
 function Map(opt_iterable) {}

 /** @return {void} */
-Map.prototype.clear;
+Map.prototype.clear = function() {};

 /**
 * @param {KEY} key
 * @return {boolean}
 */
-Map.prototype.delete;
+Map.prototype.delete = function(key) {};

 /**
 * @return {!IteratorIterable<!Array<KEY|VALUE>>}
 * @nosideeffects
 */
-Map.prototype.entries;
+Map.prototype.entries = function() {};

 /**
 * @param {function(this:THIS, VALUE, KEY, MAP)} callback
@@ -52,26 +53,27 @@ Map.prototype.entries;
 * @this {MAP}
 * @template MAP,THIS
 */
-Map.prototype.forEach;
+Map.prototype.forEach = function(callback, opt_thisArg) {};

 /**
 * @param {KEY} key
 * @return {VALUE}
 * @nosideeffects
 */
-Map.prototype.get;
+Map.prototype.get = function(key) {};

 /**
 * @param {KEY} key
 * @return {boolean}
 * @nosideeffects
 */
-Map.prototype.has;
+Map.prototype.has = function(key) {};

 /**
 * @return {!IteratorIterable<KEY>}
+ * @nosideeffects
 */
-Map.prototype.keys;
+Map.prototype.keys = function() {};

 /**
 * @param {KEY} key
@@ -80,7 +82,7 @@ Map.prototype.keys;
 * @this {THIS}
 * @template THIS
 */
-Map.prototype.set;
+Map.prototype.set = function(key, value) {};

 /**
 * @type {number}
@@ -92,7 +94,7 @@ Map.prototype.size;
 * @return {!IteratorIterable<VALUE>}
 * @nosideeffects
 */
-Map.prototype.values;
+Map.prototype.values = function() {};

 /**
 * @return {!Iterator<!Array<KEY|VALUE>>}
@@ -104,32 +106,33 @@ Map.prototype[Symbol.iterator] = function() {};
 * @constructor @struct
 * @param {Iterable<!Array<KEY|VALUE>>|!Array<!Array<KEY|VALUE>>=} opt_iterable
 * @template KEY, VALUE
+ * @nosideeffects
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap
 */
 function WeakMap(opt_iterable) {}

 /** @return {void} */
-WeakMap.prototype.clear;
+WeakMap.prototype.clear = function() {};

 /**
 * @param {KEY} key
 * @return {boolean}
 */
-WeakMap.prototype.delete;
+WeakMap.prototype.delete = function(key) {};

 /**
 * @param {KEY} key
 * @return {VALUE}
 * @nosideeffects
 */
-WeakMap.prototype.get;
+WeakMap.prototype.get = function(key) {};

 /**
 * @param {KEY} key
 * @return {boolean}
 * @nosideeffects
 */
-WeakMap.prototype.has;
+WeakMap.prototype.has = function(key) {};

 /**
 * @param {KEY} key
@@ -138,15 +141,14 @@ WeakMap.prototype.has;
 * @this {THIS}
 * @template THIS
 */
-WeakMap.prototype.set;
-
-
+WeakMap.prototype.set = function(key, value) {};

 /**
 * @constructor @struct
 * @param {Iterable<VALUE>|Array<VALUE>=} opt_iterable
 * @implements {Iterable<VALUE>}
 * @template VALUE
+ * @nosideeffects
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
 */
 function Set(opt_iterable) {}
@@ -157,25 +159,25 @@ function Set(opt_iterable) {}
 * @this {THIS}
 * @template THIS
 */
-Set.prototype.add;
+Set.prototype.add = function(value) {};

 /**
 * @return {void}
 */
-Set.prototype.clear;
+Set.prototype.clear = function() {};

 /**
 * @param {VALUE} value
 * @return {boolean}
 */
-Set.prototype.delete;
+Set.prototype.delete = function(value) {};

 /**
 * @return {!IteratorIterable<!Array<VALUE>>} Where each array has two entries:
 *     [value, value]
 * @nosideeffects
 */
-Set.prototype.entries;
+Set.prototype.entries = function() {};

 /**
 * @param {function(this: THIS, VALUE, VALUE, SET)} callback
@@ -183,14 +185,14 @@ Set.prototype.entries;
 * @this {SET}
 * @template SET,THIS
 */
-Set.prototype.forEach;
+Set.prototype.forEach = function(callback, opt_thisArg) {};

 /**
 * @param {VALUE} value
 * @return {boolean}
 * @nosideeffects
 */
-Set.prototype.has;
+Set.prototype.has = function(value) {};

 /**
 * @type {number} (readonly)
@@ -201,13 +203,13 @@ Set.prototype.size;
 * @return {!IteratorIterable<VALUE>}
 * @nosideeffects
 */
-Set.prototype.keys;
+Set.prototype.keys = function() {};

 /**
 * @return {!IteratorIterable<VALUE>}
 * @nosideeffects
 */
-Set.prototype.values;
+Set.prototype.values = function() {};

 /**
 * @return {!Iterator<VALUE>}
@@ -220,6 +222,7 @@ Set.prototype[Symbol.iterator] = function() {};
 * @constructor @struct
 * @param {Iterable<VALUE>|Array<VALUE>=} opt_iterable
 * @template VALUE
+ * @nosideeffects
 * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set
 */
 function WeakSet(opt_iterable) {}
@@ -230,22 +233,22 @@ function WeakSet(opt_iterable) {}
 * @this {THIS}
 * @template THIS
 */
-WeakSet.prototype.add;
+WeakSet.prototype.add = function(value) {};

 /**
 * @return {void}
 */
-WeakSet.prototype.clear;
+WeakSet.prototype.clear = function() {};

 /**
 * @param {VALUE} value
 * @return {boolean}
 */
-WeakSet.prototype.delete;
+WeakSet.prototype.delete = function(value) {};

 /**
 * @param {VALUE} value
 * @return {boolean}
 * @nosideeffects
 */
-WeakSet.prototype.has;
+WeakSet.prototype.has = function(value) {};
--- a/javascript/externs/es/intl.js
+++ b/javascript/externs/es/intl.js
@@ -26,7 +26,7 @@ var Intl = {};

 /**
 * NOTE: this API is not from ecma402 and is subject to change.
- * @param {string|Array.<string>=} opt_locales
+ * @param {string|Array<string>=} opt_locales
 * @param {{type: (string|undefined)}=}
 *         opt_options
 * @constructor
@@ -35,6 +35,7 @@ Intl.v8BreakIterator = function(opt_locales, opt_options) {};

 /**
 * @param {string} text
+ * @return {undefined}
 */
 Intl.v8BreakIterator.prototype.adoptText = function(text) {};

@@ -60,7 +61,7 @@ Intl.v8BreakIterator.prototype.next = function() {};

 /**
 * @constructor
- * @param {string|Array.<string>=} opt_locales
+ * @param {string|Array<string>=} opt_locales
 * @param {{usage: (string|undefined), localeMatcher: (string|undefined),
 *     sensitivity: (string|undefined), ignorePunctuation: (boolean|undefined),
 *     numeric: (boolean|undefined), caseFirst: (string|undefined)}=}
@@ -69,8 +70,9 @@ Intl.v8BreakIterator.prototype.next = function() {};
 Intl.Collator = function(opt_locales, opt_options) {};

 /**
- * @param {Array.<string>} locales
+ * @param {Array<string>} locales
 * @param {{localeMatcher: (string|undefined)}=} opt_options
+ * @return {Array<string>}
 */
 Intl.Collator.supportedLocalesOf = function(locales, opt_options) {};

@@ -90,7 +92,7 @@ Intl.Collator.prototype.resolvedOptions = function() {};

 /**
 * @constructor
- * @param {string|Array.<string>=} opt_locales
+ * @param {string|Array<string>=} opt_locales
 * @param {{localeMatcher: (string|undefined), useGrouping: (boolean|undefined),
 *     numberingSystem: (string|undefined), style: (string|undefined),
 *     currency: (string|undefined), currencyDisplay: (string|undefined),
@@ -104,8 +106,9 @@ Intl.Collator.prototype.resolvedOptions = function() {};
 Intl.NumberFormat = function(opt_locales, opt_options) {};

 /**
- * @param {Array.<string>} locales
+ * @param {Array<string>} locales
 * @param {{localeMatcher: (string|undefined)}=} opt_options
+ * @return {Array<string>}
 */
 Intl.NumberFormat.supportedLocalesOf = function(locales, opt_options) {};

@@ -115,6 +118,13 @@ Intl.NumberFormat.supportedLocalesOf = function(locales, opt_options) {};
 */
 Intl.NumberFormat.prototype.format = function(num) {};

+/**
+ * @param {number} num
+ * @return {!Array<{type: string, value: string}>}
+ * @see http://www.ecma-international.org/ecma-402/#sec-intl.numberformat.prototype.formattoparts
+ */
+Intl.NumberFormat.prototype.formatToParts = function(num) {};
+
 /**
 * @return {{locale: string, numberingSystem: string, style: string,
 *     currency: (string|undefined), currencyDisplay: (string|undefined),
@@ -126,7 +136,7 @@ Intl.NumberFormat.prototype.resolvedOptions = function() {};

 /**
 * @constructor
- * @param {string|Array.<string>=} opt_locales
+ * @param {string|Array<string>=} opt_locales
 * @param {{localeMatcher: (string|undefined),
 *    formatMatcher: (string|undefined), calendar: (string|undefined),
 *    numberingSystem: (string|undefined), tz: (string|undefined),
@@ -140,17 +150,24 @@ Intl.NumberFormat.prototype.resolvedOptions = function() {};
 Intl.DateTimeFormat = function(opt_locales, opt_options) {};

 /**
- * @param {Array.<string>} locales
+ * @param {Array<string>} locales
 * @param {{localeMatcher: string}=} opt_options
+ * @return {Array<string>}
 */
 Intl.DateTimeFormat.supportedLocalesOf = function(locales, opt_options) {};

 /**
- * @param {number} date
+ * @param {(!Date|number)=} date
 * @return {string}
 */
 Intl.DateTimeFormat.prototype.format = function(date) {};

+/**
+ * @param {(!Date|number)=} date
+ * @return {Array<{type: string, value: string}>}
+ */
+Intl.DateTimeFormat.prototype.formatToParts = function(date) {};
+
 /**
 * @return {{locale: string, calendar: string, numberingSystem: string,
 *    timeZone: (string|undefined), weekday: (string|undefined),
@@ -161,3 +178,74 @@ Intl.DateTimeFormat.prototype.format = function(date) {};
 *    hour12: (boolean|undefined)}}
 */
 Intl.DateTimeFormat.prototype.resolvedOptions = function() {};
+
+/**
+ * @constructor
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/PluralRules#Syntax
+ * @param {string|Array<string>=} opt_locales
+ * @param {{localeMatcher: (string|undefined), type: (string|undefined)}=}
+ *         opt_options
+ */
+Intl.PluralRules = function(opt_locales, opt_options) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/PluralRules/supportedLocalesOf#Syntax
+ * @param {Array<string>} locales
+ * @param {{localeMatcher: string}=} opt_options
+ * @return {Array<string>}
+ */
+Intl.PluralRules.supportedLocalesOf = function(locales, opt_options) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/PluralRules/resolvedOptions#Syntax
+ * @return {{locale: string, pluralCategories: Array<string>, type: string}}
+ */
+Intl.PluralRules.prototype.resolvedOptions = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/PluralRules/select#Syntax
+ * @param {number} number
+ * @return {string}
+ */
+Intl.PluralRules.prototype.select = function(number) {};
+
+/**
+ * @constructor
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat#Syntax
+ * @param {string|Array<string>=} opt_locales
+ * @param {{localeMatcher: (string|undefined),
+ *    numeric: (string|undefined),
+ *    style: (string|undefined)}=}
+ *        opt_options
+ */
+Intl.RelativeTimeFormat = function(opt_locales, opt_options) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat/supportedLocalesOf#Syntax
+ * @param {Array<string>} locales
+ * @param {{localeMatcher: string}=} opt_options
+ * @return {Array<string>}
+ */
+Intl.RelativeTimeFormat.supportedLocalesOf = function(locales, opt_options) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat/format#Syntax
+ * @param {number} value
+ * @param {string} unit
+ * @return {string}
+ */
+Intl.RelativeTimeFormat.prototype.format = function(value, unit) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat/formatToParts#Syntax
+ * @param {number} value
+ * @param {string} unit
+ * @return {Array<string>}
+ */
+Intl.RelativeTimeFormat.prototype.formatToParts = function(value, unit) {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RelativeTimeFormat/resolvedOptions#Syntax
+ * @return {{locale: string, pluralCategories: Array<string>, type: string}}
+ */
+Intl.RelativeTimeFormat.prototype.resolvedOptions = function() {};
--- a/javascript/externs/lib/jquery-3.2.js
+++ b/javascript/externs/lib/jquery-3.2.js
@@ -200,7 +200,7 @@ jQuery.prototype.add = function(arg1, context) {};
 jQuery.prototype.addBack = function(arg1) {};

 /**
- * @param {(string|function(number,String))} arg1
+ * @param {(string|Array<string>|function(number,String))} arg1
 * @return {!jQuery}
 */
 jQuery.prototype.addClass = function(arg1) {};
@@ -305,8 +305,16 @@ jQuery.prototype.append = function(arg1, content) {};
 jQuery.prototype.appendTo = function(target) {};

 /**
- * @param {(string|Object<string,*>)} arg1
- * @param {(string|number|boolean|function(number,string))=} arg2
+ * Only call this method with the following combinations of arguments:
+ *   function(string, (string|number|undefined))
+ *   function(!Object<string, (string|number)>)
+ *   function(string, function(this:Element number,string):(string|number))
+ *
+ * See https://api.jquery.com/attr/#attr2
+ *
+ * @param {(string|!Object<string,(string|number)>)} arg1
+ * @param {(string|number|function(this:Element,number,string):(string|number))=}
+ *     arg2
 * @return {(string|!jQuery)}
 */
 jQuery.prototype.attr = function(arg1, arg2) {};
@@ -331,6 +339,7 @@ jQuery.prototype.bind = function(arg1, eventData, arg3) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "blur", handler ) instead.
 */
 jQuery.prototype.blur = function(arg1, handler) {};

@@ -408,6 +417,7 @@ jQuery.callbacks.prototype.remove = function(callbacks) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "change", handler ) instead.
 */
 jQuery.prototype.change = function(arg1, handler) {};

@@ -428,6 +438,7 @@ jQuery.prototype.clearQueue = function(queueName) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "click", handler ) instead.
 */
 jQuery.prototype.click = function(arg1, handler) {};

@@ -461,6 +472,14 @@ jQuery.contains = function(container, contained) {};
 */
 jQuery.prototype.contents = function() {};

+/**
+ * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
+ * @param {function(!jQuery.Event)=} handler
+ * @return {!jQuery}
+ * @deprecated Please use .on( "contextmenu", handler ) instead.
+ */
+jQuery.prototype.contextmenu = function(arg1, handler) {};
+
 /**
 * @param {(string|Object<string,*>)} arg1
 * @param {(string|number|function(number,*))=} arg2
@@ -491,6 +510,7 @@ jQuery.prototype.data = function(arg1, value) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "dblclick", handler ) instead.
 */
 jQuery.prototype.dblclick = function(arg1, handler) {};

@@ -845,7 +865,7 @@ jQuery.Event.prototype.type;
 /** @type {Window} */
 jQuery.Event.prototype.view;

-/** @type {number} */
+/** @type {number} @deprecated */
 jQuery.Event.prototype.which;

 /**
@@ -922,6 +942,7 @@ jQuery.fn = jQuery.prototype;
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "focus", handler ) instead.
 */
 jQuery.prototype.focus = function(arg1, handler) {};

@@ -929,6 +950,7 @@ jQuery.prototype.focus = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "focusin", handler ) instead.
 */
 jQuery.prototype.focusin = function(arg1, handler) {};

@@ -936,6 +958,7 @@ jQuery.prototype.focusin = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "focusout", handler ) instead.
 */
 jQuery.prototype.focusout = function(arg1, handler) {};

@@ -1040,6 +1063,7 @@ jQuery.holdReady = function(hold) {};
 * @param {function(!jQuery.Event)} arg1
 * @param {function(!jQuery.Event)=} handlerOut
 * @return {!jQuery}
+ * @deprecated Please use .on( "mouseenter", handler ) and .on( "mouseleave", handler ) instead.
 */
 jQuery.prototype.hover = function(arg1, handlerOut) {};

@@ -1121,6 +1145,7 @@ jQuery.isEmptyObject = function(obj) {};
 * @param {*} obj
 * @return {boolean}
 * @nosideeffects
+ * @deprecated
 */
 jQuery.isFunction = function(obj) {};

@@ -1128,6 +1153,7 @@ jQuery.isFunction = function(obj) {};
 * @param {*} value
 * @return {boolean}
 * @nosideeffects
+ * @deprecated
 */
 jQuery.isNumeric = function(value) {};

@@ -1142,6 +1168,7 @@ jQuery.isPlainObject = function(obj) {};
 * @param {*} obj
 * @return {boolean}
 * @nosideeffects
+ * @deprecated
 */
 jQuery.isWindow = function(obj) {};

@@ -1262,6 +1289,7 @@ jQuery.jqXHR.prototype.then =
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "keydown", handler ) instead.
 */
 jQuery.prototype.keydown = function(arg1, handler) {};

@@ -1269,6 +1297,7 @@ jQuery.prototype.keydown = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "keypress", handler ) instead.
 */
 jQuery.prototype.keypress = function(arg1, handler) {};

@@ -1276,6 +1305,7 @@ jQuery.prototype.keypress = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "keyup", handler ) instead.
 */
 jQuery.prototype.keyup = function(arg1, handler) {};

@@ -1290,7 +1320,7 @@ jQuery.prototype.length;

 /**
 * @param {*} obj
- * @return {Array<*>}
+ * @return {!Array<*>}
 * @nosideeffects
 */
 jQuery.makeArray = function(obj) {};
@@ -1320,6 +1350,7 @@ jQuery.merge = function(first, second) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mousedown", handler ) instead.
 */
 jQuery.prototype.mousedown = function(arg1, handler) {};

@@ -1327,6 +1358,7 @@ jQuery.prototype.mousedown = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mousenter", handler ) instead.
 */
 jQuery.prototype.mouseenter = function(arg1, handler) {};

@@ -1334,6 +1366,7 @@ jQuery.prototype.mouseenter = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mouseleave", handler ) instead.
 */
 jQuery.prototype.mouseleave = function(arg1, handler) {};

@@ -1341,6 +1374,7 @@ jQuery.prototype.mouseleave = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mousemove", handler ) instead.
 */
 jQuery.prototype.mousemove = function(arg1, handler) {};

@@ -1348,6 +1382,7 @@ jQuery.prototype.mousemove = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mouseout", handler ) instead.
 */
 jQuery.prototype.mouseout = function(arg1, handler) {};

@@ -1355,6 +1390,7 @@ jQuery.prototype.mouseout = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mouseover", handler ) instead.
 */
 jQuery.prototype.mouseover = function(arg1, handler) {};

@@ -1362,6 +1398,7 @@ jQuery.prototype.mouseover = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "mouseup", handler ) instead.
 */
 jQuery.prototype.mouseup = function(arg1, handler) {};

@@ -1389,7 +1426,7 @@ jQuery.prototype.nextUntil = function(arg1, filter) {};

 /**
 * @param {boolean=} removeAll
- * @return {Object}
+ * @return {!typeof jQuery}
 */
 jQuery.noConflict = function(removeAll) {};

@@ -1408,6 +1445,7 @@ jQuery.prototype.not = function(arg1) {};
 /**
 * @return {number}
 * @nosideeffects
+ * @deprecated
 */
 jQuery.now = function() {};

@@ -1655,6 +1693,7 @@ jQuery.prototype.prop = function(arg1, arg2) {};
 /**
 * @param {...*} var_args
 * @return {function()}
+ * @deprecated
 */
 jQuery.proxy = function(var_args) {};

@@ -1709,7 +1748,7 @@ jQuery.prototype.remove = function(selector) {};
 jQuery.prototype.removeAttr = function(attributeName) {};

 /**
- * @param {(string|function(number,string))=} arg1
+ * @param {(string|Array<string>|function(number,string))=} arg1
 * @return {!jQuery}
 */
 jQuery.prototype.removeClass = function(arg1) {};
@@ -1749,6 +1788,7 @@ jQuery.prototype.replaceWith = function(arg1) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "resize", handler ) instead.
 */
 jQuery.prototype.resize = function(arg1, handler) {};

@@ -1756,6 +1796,7 @@ jQuery.prototype.resize = function(arg1, handler) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "scroll", handler ) instead.
 */
 jQuery.prototype.scroll = function(arg1, handler) {};

@@ -1775,6 +1816,7 @@ jQuery.prototype.scrollTop = function(value) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "select", handler ) instead.
 */
 jQuery.prototype.select = function(arg1, handler) {};

@@ -1859,6 +1901,7 @@ jQuery.prototype.stop = function(arg1, arg2, jumpToEnd) {};
 * @param {(function(!jQuery.Event)|Object<string, *>)=} arg1
 * @param {function(!jQuery.Event)=} handler
 * @return {!jQuery}
+ * @deprecated Please use .on( "submit", handler ) instead.
 */
 jQuery.prototype.submit = function(arg1, handler) {};

@@ -1932,7 +1975,7 @@ jQuery.prototype.toArray = function() {};
 jQuery.prototype.toggle = function(arg1, arg2, arg3) {};

 /**
- * @param {(string|function(number,string,boolean))} arg1
+ * @param {(string|Array<string>|function(number,string,boolean))} arg1
 * @param {boolean=} flag
 * @return {!jQuery}
 */
@@ -1963,6 +2006,7 @@ jQuery.trim = function(str) {};
 * @param {*} obj
 * @return {string}
 * @nosideeffects
+ * @deprecated
 */
 jQuery.type = function(obj) {};

--- a/javascript/externs/nodejs/assert.js
+++ b/javascript/externs/nodejs/assert.js
@@ -1,87 +1,52 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */

 /**
- * @externs
- * @fileoverview Definitions for module "assert"
+ * @fileoverview Definitions for node's assert module
+ * @see http://nodejs.org/api/assert.html
+ * @see https://github.com/joyent/node/blob/master/lib/assert.js
 */

+/**
+ * @param {*} value
+ * @param {string} message
+ * @return {void}
+ * @throws {assert.AssertionError}
+ */
+var assert = function(value, message) {};
+
+/**
+ * @param {{message: string, actual: *, expected: *, operator: string}} options
+ * @constructor
+ * @extends Error
+ */
+assert.AssertionError = function(options) {};
+
+/**
+ * @return {string}
+ */
+assert.AssertionError.prototype.toString;
+
 /**
 * @param {*} value
 * @param {string=} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-var internal = function(value, message) {};
-
-var internal = internal || {};
-
-/**
- * @param {{message: string, actual: *, expected: *, operator: string, stackStartFunction: Function}=} options
- * @return {internal.AssertionError}
- * @constructor
- */
-internal.AssertionError = function(options) {};
-
-/**
- * @type {string}
- */
-internal.AssertionError.prototype.name;
-
-/**
- * @type {string}
- */
-internal.AssertionError.prototype.message;
-
-/**
- * @type {*}
- */
-internal.AssertionError.prototype.actual;
-
-/**
- * @type {*}
- */
-internal.AssertionError.prototype.expected;
-
-/**
- * @type {string}
- */
-internal.AssertionError.prototype.operator;
-
-/**
- * @type {boolean}
- */
-internal.AssertionError.prototype.generatedMessage;
+assert.ok;

 /**
 * @param {*} actual
@@ -89,96 +54,89 @@ internal.AssertionError.prototype.generatedMessage;
 * @param {string} message
 * @param {string} operator
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.fail = function(actual, expected, message, operator) {};
-
-/**
- * @param {*} value
- * @param {string=} message
- * @return {void}
- */
-internal.ok = function(value, message) {};
+assert.fail;

 /**
 * @param {*} actual
 * @param {*} expected
- * @param {string=} message
+ * @param {string} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.equal = function(actual, expected, message) {};
+assert.equal;

 /**
 * @param {*} actual
 * @param {*} expected
- * @param {string=} message
+ * @param {string} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.notEqual = function(actual, expected, message) {};
+assert.notEqual;

 /**
 * @param {*} actual
 * @param {*} expected
- * @param {string=} message
+ * @param {string} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.deepEqual = function(actual, expected, message) {};
-
-/**
- * @param {*} acutal
- * @param {*} expected
- * @param {string=} message
- * @return {void}
- */
-internal.notDeepEqual = function(acutal, expected, message) {};
+assert.deepEqual;

 /**
 * @param {*} actual
 * @param {*} expected
- * @param {string=} message
+ * @param {string} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.strictEqual = function(actual, expected, message) {};
+assert.notDeepEqual;

 /**
 * @param {*} actual
 * @param {*} expected
- * @param {string=} message
+ * @param {string} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.notStrictEqual = function(actual, expected, message) {};
+assert.strictEqual;

 /**
 * @param {*} actual
 * @param {*} expected
+ * @param {string} message
+ * @return {void}
+ * @throws {assert.AssertionError}
+ */
+assert.notStrictEqual;
+
+/**
+ * @name assert.throws
+ * @function
+ * @param {function()} block
+ * @param {Function|RegExp|function(*)} error
 * @param {string=} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.deepStrictEqual = function(actual, expected, message) {};
+assert.throws;

 /**
- * @param {*} actual
- * @param {*} expected
+ * @param {function()} block
+ * @param {Function|RegExp|function(*)} error
 * @param {string=} message
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.notDeepStrictEqual = function(actual, expected, message) {};
-
-/**
- * @type {(function(Function, string=): void)|(function(Function, Function, string=): void)|(function(Function, RegExp, string=): void)|(function(Function, (function(*): boolean), string=): void)}
- */
-internal.throws;
-
-/**
- * @type {(function(Function, string=): void)|(function(Function, Function, string=): void)|(function(Function, RegExp, string=): void)|(function(Function, (function(*): boolean), string=): void)}
- */
-internal.doesNotThrow;
+assert.doesNotThrow;

 /**
 * @param {*} value
 * @return {void}
+ * @throws {assert.AssertionError}
 */
-internal.ifError = function(value) {};
-
-
-module.exports = internal;
+assert.ifError;

+module.exports = assert;
--- a/javascript/externs/nodejs/buffer.js
+++ b/javascript/externs/nodejs/buffer.js
@@ -1,196 +1,65 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "buffer"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's buffer module.
+ * @see http://nodejs.org/api/buffer.html
+ * @see https://github.com/joyent/node/blob/master/lib/buffer.js
+ */
+
+/**
+ * @const
+ */
 var buffer = {};

-/**
- * @type {number}
- */
-buffer.INSPECT_MAX_BYTES;
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @return {Buffer}
- * @constructor
- */
-var BuffType = function(str, encoding) {};
+/** @const {function(new:Buffer, ...?)} */
+buffer.Buffer;

 /**
 * @param {number} size
- * @return {Buffer}
 * @constructor
 */
-var BuffType = function(size) {};
+buffer.SlowBuffer = function(size) {};

 /**
- * @param {Uint8Array} array
+ *
+ * @param {string} string
+ * @param {number|string} offset
+ * @param {number|string=} length
+ * @param {number|string=} encoding
+ * @return {*}
+ */
+buffer.SlowBuffer.prototype.write;
+
+/**
+ * @param {number} start
+ * @param {number} end
 * @return {Buffer}
- * @constructor
 */
-var BuffType = function(array) {};
+buffer.SlowBuffer.prototype.slice;

 /**
- * @param {ArrayBuffer} arrayBuffer
- * @return {Buffer}
- * @constructor
+ * @return {string}
 */
-var BuffType = function(arrayBuffer) {};
-
-/**
- * @param {Array<*>} array
- * @return {Buffer}
- * @constructor
- */
-var BuffType = function(array) {};
-
-/**
- * @param {Buffer} buffer
- * @return {Buffer}
- * @constructor
- */
-var BuffType = function(buffer) {};
-
-/**
- * @type {Buffer}
- */
-BuffType.prototype;
-
-/**
- * @type {(function(Array<*>): Buffer)|(function(ArrayBuffer, number=, number=): Buffer)|(function(Buffer): Buffer)|(function(string, string=): Buffer)}
- */
-BuffType.from;
-
-/**
- * @type {(function(*): boolean)}
- */
-BuffType.isBuffer;
-
-/**
- * @type {(function(string): boolean)}
- */
-BuffType.isEncoding;
-
-/**
- * @type {(function(string, string=): number)}
- */
-BuffType.byteLength;
-
-/**
- * @type {(function(Array<Buffer>, number=): Buffer)}
- */
-BuffType.concat;
-
-/**
- * @type {(function(Buffer, Buffer): number)}
- */
-BuffType.compare;
-
-/**
- * @type {(function(number, (string|Buffer|number)=, string=): Buffer)}
- */
-BuffType.alloc;
-
-/**
- * @type {(function(number): Buffer)}
- */
-BuffType.allocUnsafe;
-
-/**
- * @type {(function(number): Buffer)}
- */
-BuffType.allocUnsafeSlow;
-
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @return {Buffer}
- * @constructor
- */
-var SlowBuffType = function(str, encoding) {};
+buffer.SlowBuffer.prototype.toString;

 /**
 * @param {number} size
- * @return {Buffer}
- * @constructor
+ * @param {(string|!Buffer|number)=} fill
+ * @param {string=} encoding
+ * @return {!Buffer}
 */
-var SlowBuffType = function(size) {};
-
-/**
- * @param {Uint8Array} size
- * @return {Buffer}
- * @constructor
- */
-var SlowBuffType = function(size) {};
-
-/**
- * @param {Array<*>} array
- * @return {Buffer}
- * @constructor
- */
-var SlowBuffType = function(array) {};
-
-/**
- * @type {Buffer}
- */
-SlowBuffType.prototype;
-
-/**
- * @type {(function(*): boolean)}
- */
-SlowBuffType.isBuffer;
-
-/**
- * @type {(function(string, string=): number)}
- */
-SlowBuffType.byteLength;
-
-/**
- * @type {(function(Array<Buffer>, number=): Buffer)}
- */
-SlowBuffType.concat;
-
-
-module.exports.Buffer = BuffType;
-
-module.exports.SlowBuffer = SlowBuffType;
-
-module.exports.INSPECT_MAX_BYTES = buffer.INSPECT_MAX_BYTES;
-
+buffer.Buffer.alloc;
--- a/javascript/externs/nodejs/child_process.js
+++ b/javascript/externs/nodejs/child_process.js
--- a/javascript/externs/nodejs/cluster.js
+++ b/javascript/externs/nodejs/cluster.js
--- a/javascript/externs/nodejs/crypto.js
+++ b/javascript/externs/nodejs/crypto.js
--- a/javascript/externs/nodejs/dgram.js
+++ b/javascript/externs/nodejs/dgram.js
@@ -1,238 +1,109 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "dgram"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's dgram module. Depends on the events module.
+ * @see http://nodejs.org/api/dgram.html
+ * @see https://github.com/joyent/node/blob/master/lib/dgram.js
+ */
+
+var events = require('events');
+
+/**
+ * @const
+ */
 var dgram = {};

-var events = require("events");
-
-/**
- * @interface
- */
-function RemoteInfo() {}
-
-/**
- * @type {string}
- */
-RemoteInfo.prototype.address;
-
-/**
- * @type {number}
- */
-RemoteInfo.prototype.port;
-
-/**
- * @type {number}
- */
-RemoteInfo.prototype.size;
-
-/**
- * @interface
- */
-function AddressInfo() {}
-
-/**
- * @type {string}
- */
-AddressInfo.prototype.address;
-
-/**
- * @type {string}
- */
-AddressInfo.prototype.family;
-
-/**
- * @type {number}
- */
-AddressInfo.prototype.port;
-
-/**
- * @interface
- */
-function BindOptions() {}
-
-/**
- * @type {number}
- */
-BindOptions.prototype.port;
-
-/**
- * @type {string}
- */
-BindOptions.prototype.address;
-
-/**
- * @type {boolean}
- */
-BindOptions.prototype.exclusive;
-
-/**
- * @interface
- */
-function SocketOptions() {}
-
-/**
- * @type {(string)}
- */
-SocketOptions.prototype.type;
-
-/**
- * @type {boolean}
- */
-SocketOptions.prototype.reuseAddr;
-
 /**
 * @param {string} type
- * @param {(function(Buffer, dgram.RemoteInfo): void)=} callback
+ * @param {function(...)=} callback
 * @return {dgram.Socket}
 */
-dgram.createSocket = function(type, callback) {};
+dgram.createSocket;

 /**
- * @param {dgram.SocketOptions} options
- * @param {(function(Buffer, dgram.RemoteInfo): void)=} callback
- * @return {dgram.Socket}
- */
-dgram.createSocket = function(options, callback) {};
-
-/**
- * @interface
- * @extends {events.EventEmitter}
+ * @constructor
+ * @extends events.EventEmitter
 */
 dgram.Socket = function() {};

 /**
- * @param {(Buffer|String|Array<*>)} msg
- * @param {number} port
- * @param {string} address
- * @param {(function(Error, number): void)=} callback
- * @return {void}
- */
-dgram.Socket.prototype.send = function(msg, port, address, callback) {};
-
-/**
- * @param {(Buffer|String|Array<*>)} msg
+ * @param {Buffer} buf
 * @param {number} offset
 * @param {number} length
 * @param {number} port
 * @param {string} address
- * @param {(function(Error, number): void)=} callback
+ * @param {function(...)=} callback
 * @return {void}
 */
-dgram.Socket.prototype.send = function(msg, offset, length, port, address, callback) {};
+dgram.Socket.prototype.send;

 /**
- * @param {number=} port
+ * @param {number} port
 * @param {string=} address
- * @param {(function(): void)=} callback
 * @return {void}
 */
-dgram.Socket.prototype.bind = function(port, address, callback) {};
+dgram.Socket.prototype.bind;

 /**
- * @param {dgram.BindOptions} options
- * @param {Function=} callback
 * @return {void}
 */
-dgram.Socket.prototype.bind = function(options, callback) {};
+dgram.Socket.prototype.close;

 /**
- * @param {*=} callback
- * @return {void}
+ * @return {string}
 */
-dgram.Socket.prototype.close = function(callback) {};
-
-/**
- * @return {dgram.AddressInfo}
- */
-dgram.Socket.prototype.address = function() {};
+dgram.Socket.prototype.address;

 /**
 * @param {boolean} flag
 * @return {void}
 */
-dgram.Socket.prototype.setBroadcast = function(flag) {};
+dgram.Socket.prototype.setBroadcast;

 /**
 * @param {number} ttl
- * @return {void}
+ * @return {number}
 */
-dgram.Socket.prototype.setTTL = function(ttl) {};
+dgram.Socket.prototype.setTTL;

 /**
 * @param {number} ttl
- * @return {void}
+ * @return {number}
 */
-dgram.Socket.prototype.setMulticastTTL = function(ttl) {};
+dgram.Socket.prototype.setMulticastTTL;

 /**
 * @param {boolean} flag
 * @return {void}
 */
-dgram.Socket.prototype.setMulticastLoopback = function(flag) {};
+dgram.Socket.prototype.setMulticastLoopback;

 /**
 * @param {string} multicastAddress
 * @param {string=} multicastInterface
 * @return {void}
 */
-dgram.Socket.prototype.addMembership = function(multicastAddress, multicastInterface) {};
+dgram.Socket.prototype.addMembership;

 /**
 * @param {string} multicastAddress
 * @param {string=} multicastInterface
 * @return {void}
 */
-dgram.Socket.prototype.dropMembership = function(multicastAddress, multicastInterface) {};
-
-/**
- * @return {void}
- */
-dgram.Socket.prototype.ref = function() {};
-
-/**
- * @return {void}
- */
-dgram.Socket.prototype.unref = function() {};
-
-module.exports.createSocket = dgram.createSocket;
-
-module.exports.createSocket = dgram.createSocket;
-
-module.exports.Socket = dgram.Socket;
+dgram.Socket.prototype.dropMembership;

+module.exports = dgram;
--- a/javascript/externs/nodejs/dns.js
+++ b/javascript/externs/nodejs/dns.js
@@ -1,344 +1,244 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "dns"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's dns module.
+ * @see http://nodejs.org/api/dns.html
+ * @see https://github.com/joyent/node/blob/master/lib/dns.js
+ */
+
+/**
+ * @const
+ */
 var dns = {};

 /**
- * @interface
+ * @param {string} domain
+ * @param {string|function(Error,string,string)} family
+ * @param {function(?Error,string,string)=} callback
+ * @return {void}
 */
-dns.MxRecord = function() {};
-
-/**
- * @type {string}
- */
-dns.MxRecord.prototype.exchange;
-
-/**
- * @type {number}
- */
-dns.MxRecord.prototype.priority;
+dns.lookup;

 /**
 * @param {string} domain
- * @param {number} family
- * @param {(function(Error, string, number): void)} callback
- * @return {string}
+ * @param {string|function(?Error,Array)} rrtype
+ * @param {function(?Error,Array)=} callback
+ * @return {void}
 */
-dns.lookup = function(domain, family, callback) {};
+dns.resolve;

 /**
 * @param {string} domain
- * @param {(function(Error, string, number): void)} callback
- * @return {string}
+ * @param {function(?Error,Array)} callback
+ * @return {void}
 */
-dns.lookup = function(domain, callback) {};
+dns.resolve4;

 /**
 * @param {string} domain
- * @param {string} rrtype
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)} callback
+ * @return {void}
 */
-dns.resolve = function(domain, rrtype, callback) {};
+dns.resolve6;

 /**
 * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)}callback
+ * @return {void}
 */
-dns.resolve = function(domain, callback) {};
+dns.resolveMx;

 /**
 * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)}callback
+ * @return {void}
 */
-dns.resolve4 = function(domain, callback) {};
+dns.resolveTxt;

 /**
 * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)}callback
+ * @return {void}
 */
-dns.resolve6 = function(domain, callback) {};
+dns.resolveSrv;

 /**
 * @param {string} domain
- * @param {(function(Error, Array<dns.MxRecord>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)}callback
+ * @return {void}
 */
-dns.resolveMx = function(domain, callback) {};
+dns.resolveNs;

 /**
 * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
+ * @param {function(?Error,Array)}callback
+ * @return {void}
 */
-dns.resolveTxt = function(domain, callback) {};
-
-/**
- * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
- */
-dns.resolveSrv = function(domain, callback) {};
-
-/**
- * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
- */
-dns.resolveNs = function(domain, callback) {};
-
-/**
- * @param {string} domain
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
- */
-dns.resolveCname = function(domain, callback) {};
+dns.resolveCname;

 /**
 * @param {string} ip
- * @param {(function(Error, Array<string>): void)} callback
- * @return {Array<string>}
- */
-dns.reverse = function(ip, callback) {};
-
-/**
- * @param {Array<string>} servers
+ * @param {function(?Error,Array)}callback
 * @return {void}
 */
-dns.setServers = function(servers) {};
+dns.reverse;

 /**
 * @type {string}
+ * @const
 */
-dns.NODATA;
+dns.NODATA = 'ENODATA';

 /**
 * @type {string}
+ * @const
 */
-dns.FORMERR;
+dns.FORMERR = 'EFORMERR';

 /**
 * @type {string}
+ * @const
 */
-dns.SERVFAIL;
+dns.SERVFAIL = 'ESERVFAIL';

 /**
 * @type {string}
+ * @const
 */
-dns.NOTFOUND;
+dns.NOTFOUND = 'ENOTFOUND';

 /**
 * @type {string}
+ * @const
 */
-dns.NOTIMP;
+dns.NOTIMP = 'ENOTIMP';

 /**
 * @type {string}
+ * @const
 */
-dns.REFUSED;
+dns.REFUSED = 'EREFUSED';

 /**
 * @type {string}
+ * @const
 */
-dns.BADQUERY;
+dns.BADQUERY = 'EBADQUERY';

 /**
 * @type {string}
+ * @const
 */
-dns.BADNAME;
+dns.BADNAME = 'EBADNAME';

 /**
 * @type {string}
+ * @const
 */
-dns.BADFAMILY;
+dns.BADFAMILY = 'EBADFAMILY';

 /**
 * @type {string}
+ * @const
 */
-dns.BADRESP;
+dns.BADRESP = 'EBADRESP';

 /**
 * @type {string}
+ * @const
 */
-dns.CONNREFUSED;
+dns.CONNREFUSED = 'ECONNREFUSED';

 /**
 * @type {string}
+ * @const
 */
-dns.TIMEOUT;
+dns.TIMEOUT = 'ETIMEOUT';

 /**
 * @type {string}
+ * @const
 */
-dns.EOF;
+dns.EOF = 'EOF';

 /**
 * @type {string}
+ * @const
 */
-dns.FILE;
+dns.FILE = 'EFILE';

 /**
 * @type {string}
+ * @const
 */
-dns.NOMEM;
+dns.NOMEM = 'ENOMEM';

 /**
 * @type {string}
+ * @const
 */
-dns.DESTRUCTION;
+dns.DESTRUCTION = 'EDESTRUCTION';

 /**
 * @type {string}
+ * @const
 */
-dns.BADSTR;
+dns.BADSTR = 'EBADSTR';

 /**
 * @type {string}
+ * @const
 */
-dns.BADFLAGS;
+dns.BADFLAGS = 'EBADFLAGS';

 /**
 * @type {string}
+ * @const
 */
-dns.NONAME;
+dns.NONAME = 'ENONAME';

 /**
 * @type {string}
+ * @const
 */
-dns.BADHINTS;
+dns.BADHINTS = 'EBADHINTS';

 /**
 * @type {string}
+ * @const
 */
-dns.NOTINITIALIZED;
+dns.NOTINITIALIZED = 'ENOTINITIALIZED';

 /**
 * @type {string}
+ * @const
 */
-dns.LOADIPHLPAPI;
+dns.LOADIPHLPAPI = 'ELOADIPHLPAPI';

 /**
 * @type {string}
+ * @const
 */
-dns.ADDRGETNETWORKPARAMS;
+dns.ADDRGETNETWORKPARAMS = 'EADDRGETNETWORKPARAMS';

 /**
 * @type {string}
+ * @const
 */
-dns.CANCELLED;
-
-module.exports.MxRecord = dns.MxRecord;
-
-module.exports.lookup = dns.lookup;
-
-module.exports.lookup = dns.lookup;
-
-module.exports.resolve = dns.resolve;
-
-module.exports.resolve = dns.resolve;
-
-module.exports.resolve4 = dns.resolve4;
-
-module.exports.resolve6 = dns.resolve6;
-
-module.exports.resolveMx = dns.resolveMx;
-
-module.exports.resolveTxt = dns.resolveTxt;
-
-module.exports.resolveSrv = dns.resolveSrv;
-
-module.exports.resolveNs = dns.resolveNs;
-
-module.exports.resolveCname = dns.resolveCname;
-
-module.exports.reverse = dns.reverse;
-
-module.exports.setServers = dns.setServers;
-
-module.exports.NODATA = dns.NODATA;
-
-module.exports.FORMERR = dns.FORMERR;
-
-module.exports.SERVFAIL = dns.SERVFAIL;
-
-module.exports.NOTFOUND = dns.NOTFOUND;
-
-module.exports.NOTIMP = dns.NOTIMP;
-
-module.exports.REFUSED = dns.REFUSED;
-
-module.exports.BADQUERY = dns.BADQUERY;
-
-module.exports.BADNAME = dns.BADNAME;
-
-module.exports.BADFAMILY = dns.BADFAMILY;
-
-module.exports.BADRESP = dns.BADRESP;
-
-module.exports.CONNREFUSED = dns.CONNREFUSED;
-
-module.exports.TIMEOUT = dns.TIMEOUT;
-
-module.exports.EOF = dns.EOF;
-
-module.exports.FILE = dns.FILE;
-
-module.exports.NOMEM = dns.NOMEM;
-
-module.exports.DESTRUCTION = dns.DESTRUCTION;
-
-module.exports.BADSTR = dns.BADSTR;
-
-module.exports.BADFLAGS = dns.BADFLAGS;
-
-module.exports.NONAME = dns.NONAME;
-
-module.exports.BADHINTS = dns.BADHINTS;
-
-module.exports.NOTINITIALIZED = dns.NOTINITIALIZED;
-
-module.exports.LOADIPHLPAPI = dns.LOADIPHLPAPI;
-
-module.exports.ADDRGETNETWORKPARAMS = dns.ADDRGETNETWORKPARAMS;
-
-module.exports.CANCELLED = dns.CANCELLED;
+dns.CANCELLED = 'ECANCELLED';

+module.exports = dns;
--- a/javascript/externs/nodejs/domain.js
+++ b/javascript/externs/nodejs/domain.js
@@ -1,116 +1,97 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "domain"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's domain module. Depends on the events module.
+ * @see http://nodejs.org/api/domain.html
+ * @see https://github.com/joyent/node/blob/master/lib/domain.js
+ */
+
+var events = require('events');
+
+/**
+ * @const
+ */
 var domain = {};

-var events = require("events");
-
-/**
- * @constructor
- * @extends {events.EventEmitter}
- * @implements {NodeJS.Domain}
- */
-domain.Domain;
-
-/**
- * @param {Function} fn
- * @return {void}
- */
-domain.Domain.prototype.run = function(fn) {};
-
-/**
- * @param {events.EventEmitter} emitter
- * @return {void}
- */
-domain.Domain.prototype.add = function(emitter) {};
-
-/**
- * @param {events.EventEmitter} emitter
- * @return {void}
- */
-domain.Domain.prototype.remove = function(emitter) {};
-
-/**
- * @param {(function(Error, *): *)} cb
- * @return {*}
- */
-domain.Domain.prototype.bind = function(cb) {};
-
-/**
- * @param {(function(*): *)} cb
- * @return {*}
- */
-domain.Domain.prototype.intercept = function(cb) {};
-
-/**
- * @return {void}
- */
-domain.Domain.prototype.dispose = function() {};
-
-/**
- * @type {Array<*>}
- */
-domain.Domain.prototype.members;
-
-/**
- * @return {void}
- */
-domain.Domain.prototype.enter = function() {};
-
-/**
- * @return {void}
- */
-domain.Domain.prototype.exit = function() {};
-
-/**
- * @return {domain.Domain}
- */
-domain.create = function() {};
-
-module.exports.Domain = domain.Domain;
-
-module.exports.create = domain.create;
-
 /**
 * @type {domain.Domain}
 */
 domain.active;

-module.exports.active = domain.active;
+/**
+ * @return {domain.Domain}
+ */
+domain.create;

+/**
+ * @constructor
+ * @extends events.EventEmitter
+ */
+domain.Domain = function () {};
+
+/**
+ * @param {function()} fn
+ */
+domain.Domain.prototype.run;
+
+/**
+ * @type {Array}
+ */
+domain.Domain.prototype.members;
+
+/**
+ * @param {events.EventEmitter} emitter
+ * @return {void}
+ */
+domain.Domain.prototype.add;
+
+/**
+ * @param {events.EventEmitter} emitter
+ * @return {void}
+ */
+domain.Domain.prototype.remove;
+
+/**
+ * @param {function(...*)} callback
+ * @return {function(...*)}
+ */
+domain.Domain.prototype.bind;
+
+/**
+ * @param {function(...*)} callback
+ * @return {function(...*)}
+ */
+domain.Domain.prototype.intercept;
+
+/**
+ * @return {void}
+ */
+domain.Domain.prototype.dispose;
+
+// Undocumented
+
+/**
+ * @return {void}
+ */
+domain.Domain.prototype.enter;
+
+/**
+ * @return {void}
+ */
+domain.Domain.prototype.exit;
+
+module.exports = domain;
--- a/javascript/externs/nodejs/events.js
+++ b/javascript/externs/nodejs/events.js
@@ -1,149 +1,100 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "events"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

-var events = function() {};
+/**
+ * @fileoverview Definitions for node's "events" module.
+ * @externs
+ *
+ * @see http://nodejs.org/api/events.html
+ * @see https://github.com/joyent/node/blob/master/lib/events.js
+ */
+
+/**
+ * @const
+ */
+var events = {};

 /**
 * @constructor
- * @extends {NodeJS.EventEmitter}
 */
-events.EventEmitter;
-
-/**
- * @type {events.EventEmitter}
- */
-events.EventEmitter.EventEmitter;
-
-/**
- * @param {events.EventEmitter} emitter
- * @param {string} event
- * @return {number}
- */
-events.EventEmitter.listenerCount = function(emitter, event) {};
-
-/**
- * @type {number}
- */
-events.EventEmitter.defaultMaxListeners;
+events.EventEmitter = function() {};

 /**
 * @param {string} event
- * @param {Function} listener
- * @return {*}
+ * @param {function(...)} listener
+ * @return {events.EventEmitter}
 */
-events.EventEmitter.prototype.addListener = function(event, listener) {};
+events.EventEmitter.prototype.addListener;

 /**
 * @param {string} event
- * @param {Function} listener
- * @return {*}
+ * @param {function(...)} listener
+ * @return {events.EventEmitter}
 */
-events.EventEmitter.prototype.on = function(event, listener) {};
+events.EventEmitter.prototype.on;

 /**
 * @param {string} event
- * @param {Function} listener
- * @return {*}
+ * @param {function(...)} listener
+ * @return {events.EventEmitter}
 */
-events.EventEmitter.prototype.once = function(event, listener) {};
+events.EventEmitter.prototype.once;

 /**
 * @param {string} event
- * @param {Function} listener
- * @return {*}
+ * @param {function(...)} listener
+ * @return {events.EventEmitter}
 */
-events.EventEmitter.prototype.prependListener = function(event, listener) {};
-
-/**
- * @param {string} event
- * @param {Function} listener
- * @return {*}
- */
-events.EventEmitter.prototype.prependOnceListener = function(event, listener) {};
-
-/**
- * @param {string} event
- * @param {Function} listener
- * @return {*}
- */
-events.EventEmitter.prototype.removeListener = function(event, listener) {};
+events.EventEmitter.prototype.removeListener;

 /**
 * @param {string=} event
- * @return {*}
+ * @return {events.EventEmitter}
 */
-events.EventEmitter.prototype.removeAllListeners = function(event) {};
+events.EventEmitter.prototype.removeAllListeners;

 /**
 * @param {number} n
- * @return {*}
+ * @return {void}
 */
-events.EventEmitter.prototype.setMaxListeners = function(n) {};
-
-/**
- * @return {number}
- */
-events.EventEmitter.prototype.getMaxListeners = function() {};
+events.EventEmitter.prototype.setMaxListeners;

 /**
 * @param {string} event
- * @return {Array<Function>}
+ * @return {Array.<function(...)>}
 */
-events.EventEmitter.prototype.listeners = function(event) {};
+events.EventEmitter.prototype.listeners;

 /**
 * @param {string} event
- * @param {...*} args
+ * @param {...*} var_args
 * @return {boolean}
 */
-events.EventEmitter.prototype.emit = function(event, args) {};
+events.EventEmitter.prototype.emit;
+
+// Undocumented

 /**
- * @return {Array<string>}
+ * @type {boolean}
 */
-events.EventEmitter.prototype.eventNames = function() {};
+events.usingDomains;

 /**
+ * @param {events.EventEmitter} emitter
 * @param {string} type
- * @return {number}
+ * @return {void}
 */
-events.EventEmitter.prototype.listenerCount = function(type) {};
-
-module.exports = events;
-
+events.EventEmitter.listenerCount;
--- a/javascript/externs/nodejs/fs.js
+++ b/javascript/externs/nodejs/fs.js
--- a/javascript/externs/nodejs/globals.js
+++ b/javascript/externs/nodejs/globals.js
--- a/javascript/externs/nodejs/http.js
+++ b/javascript/externs/nodejs/http.js
@@ -1,447 +1,88 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "http"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's http module. Depends on the events module.
+ * @see http://nodejs.org/api/http.html
+ * @see https://github.com/joyent/node/blob/master/lib/http.js
+ */
+
+var events = require('events');
+var net = require('net');
+var stream = require('stream');
+
+/** @const */
 var http = {};

-var net = require("net");
-
 /**
- * @interface
+ * @typedef {function(http.IncomingMessage, http.ServerResponse)}
 */
-http.RequestOptions = function() {};
+http.requestListener;

 /**
- * @type {string}
+ * @param {http.requestListener=} listener
+ * @return {http.Server}
 */
-http.RequestOptions.prototype.protocol;
+http.createServer;

 /**
- * @type {string}
+ * @param {http.requestListener=} listener
+ * @constructor
+ * @extends events.EventEmitter
 */
-http.RequestOptions.prototype.host;
+http.Server = function(listener) {};

 /**
- * @type {string}
- */
-http.RequestOptions.prototype.hostname;
-
-/**
- * @type {number}
- */
-http.RequestOptions.prototype.family;
-
-/**
- * @type {number}
- */
-http.RequestOptions.prototype.port;
-
-/**
- * @type {string}
- */
-http.RequestOptions.prototype.localAddress;
-
-/**
- * @type {string}
- */
-http.RequestOptions.prototype.socketPath;
-
-/**
- * @type {string}
- */
-http.RequestOptions.prototype.method;
-
-/**
- * @type {string}
- */
-http.RequestOptions.prototype.path;
-
-http.RequestOptions.prototype.headers;
-
-
-/**
- * @type {string}
- */
-http.RequestOptions.prototype.auth;
-
-/**
- * @type {(http.Agent|boolean)}
- */
-http.RequestOptions.prototype.agent;
-
-/**
- * @interface
- * @extends {net.Server}
- */
-http.Server = function() {};
-
-/**
- * @param {number} msecs
- * @param {Function} callback
- * @return {void}
- */
-http.Server.prototype.setTimeout = function(msecs, callback) {};
-
-/**
- * @type {number}
- */
-http.Server.prototype.maxHeadersCount;
-
-/**
- * @type {number}
- */
-http.Server.prototype.timeout;
-
-/**
- * @type {boolean}
- */
-http.Server.prototype.listening;
-
-/**
- * @interface
- * @extends {http.IncomingMessage}
- */
-http.ServerRequest = function() {};
-
-/**
- * @type {net.Socket}
- */
-http.ServerRequest.prototype.connection;
-
-/**
- * @interface
- * @extends {internal.Writable}
- */
-http.ServerResponse = function() {};
-
-/**
- * @param {Buffer} buffer
- * @return {boolean}
- */
-http.ServerResponse.prototype.write = function(buffer) {};
-
-/**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ServerResponse.prototype.write = function(buffer, cb) {};
-
-/**
- * @param {string} str
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ServerResponse.prototype.write = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ServerResponse.prototype.write = function(str, encoding, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {string=} fd
- * @return {boolean}
- */
-http.ServerResponse.prototype.write = function(str, encoding, fd) {};
-
-/**
- * @param {*} chunk
- * @param {string=} encoding
- * @return {*}
- */
-http.ServerResponse.prototype.write = function(chunk, encoding) {};
-
-/**
- * @return {void}
- */
-http.ServerResponse.prototype.writeContinue = function() {};
-
-/**
- * @param {number} statusCode
- * @param {string=} reasonPhrase
- * @param {*=} headers
- * @return {void}
- */
-http.ServerResponse.prototype.writeHead = function(statusCode, reasonPhrase, headers) {};
-
-/**
- * @param {number} statusCode
- * @param {*=} headers
- * @return {void}
- */
-http.ServerResponse.prototype.writeHead = function(statusCode, headers) {};
-
-/**
- * @type {number}
- */
-http.ServerResponse.prototype.statusCode;
-
-/**
- * @type {string}
- */
-http.ServerResponse.prototype.statusMessage;
-
-/**
- * @type {boolean}
- */
-http.ServerResponse.prototype.headersSent;
-
-/**
- * @param {string} name
- * @param {(string|Array<string>)} value
- * @return {void}
- */
-http.ServerResponse.prototype.setHeader = function(name, value) {};
-
-/**
- * @param {number} msecs
- * @param {Function} callback
- * @return {http.ServerResponse}
- */
-http.ServerResponse.prototype.setTimeout = function(msecs, callback) {};
-
-/**
- * @type {boolean}
- */
-http.ServerResponse.prototype.sendDate;
-
-/**
- * @param {string} name
- * @return {string}
- */
-http.ServerResponse.prototype.getHeader = function(name) {};
-
-/**
- * @param {string} name
- * @return {void}
- */
-http.ServerResponse.prototype.removeHeader = function(name) {};
-
-/**
- * @param {*} headers
- * @return {void}
- */
-http.ServerResponse.prototype.addTrailers = function(headers) {};
-
-/**
- * @type {boolean}
- */
-http.ServerResponse.prototype.finished;
-
-/**
- * @return {void}
- */
-http.ServerResponse.prototype.end = function() {};
-
-/**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {void}
- */
-http.ServerResponse.prototype.end = function(buffer, cb) {};
-
-/**
- * @param {string} str
- * @param {Function=} cb
- * @return {void}
- */
-http.ServerResponse.prototype.end = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {void}
- */
-http.ServerResponse.prototype.end = function(str, encoding, cb) {};
-
-/**
- * @param {*=} data
- * @param {string=} encoding
- * @return {void}
- */
-http.ServerResponse.prototype.end = function(data, encoding) {};
-
-/**
- * @interface
- * @extends {internal.Writable}
- */
-http.ClientRequest = function() {};
-
-/**
- * @param {Buffer} buffer
- * @return {boolean}
- */
-http.ClientRequest.prototype.write = function(buffer) {};
-
-/**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ClientRequest.prototype.write = function(buffer, cb) {};
-
-/**
- * @param {string} str
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ClientRequest.prototype.write = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {boolean}
- */
-http.ClientRequest.prototype.write = function(str, encoding, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {string=} fd
- * @return {boolean}
- */
-http.ClientRequest.prototype.write = function(str, encoding, fd) {};
-
-/**
- * @param {*} chunk
- * @param {string=} encoding
- * @return {void}
- */
-http.ClientRequest.prototype.write = function(chunk, encoding) {};
-
-/**
- * @return {void}
- */
-http.ClientRequest.prototype.abort = function() {};
-
-/**
- * @param {number} timeout
+ * @param {(number|string)} portOrPath
+ * @param {(string|Function)=} hostnameOrCallback
 * @param {Function=} callback
- * @return {void}
 */
-http.ClientRequest.prototype.setTimeout = function(timeout, callback) {};
-
-/**
- * @param {boolean=} noDelay
- * @return {void}
- */
-http.ClientRequest.prototype.setNoDelay = function(noDelay) {};
-
-/**
- * @param {boolean=} enable
- * @param {number=} initialDelay
- * @return {void}
- */
-http.ClientRequest.prototype.setSocketKeepAlive = function(enable, initialDelay) {};
-
-/**
- * @param {string} name
- * @param {(string|Array<string>)} value
- * @return {void}
- */
-http.ClientRequest.prototype.setHeader = function(name, value) {};
-
-/**
- * @param {string} name
- * @return {string}
- */
-http.ClientRequest.prototype.getHeader = function(name) {};
-
-/**
- * @param {string} name
- * @return {void}
- */
-http.ClientRequest.prototype.removeHeader = function(name) {};
-
-/**
- * @param {*} headers
- * @return {void}
- */
-http.ClientRequest.prototype.addTrailers = function(headers) {};
+http.Server.prototype.listen;

 /**
 * @return {void}
 */
-http.ClientRequest.prototype.end = function() {};
+http.Server.prototype.close;

 /**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {void}
- */
-http.ClientRequest.prototype.end = function(buffer, cb) {};
-
-/**
- * @param {string} str
- * @param {Function=} cb
- * @return {void}
- */
-http.ClientRequest.prototype.end = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {void}
- */
-http.ClientRequest.prototype.end = function(str, encoding, cb) {};
-
-/**
- * @param {*=} data
- * @param {string=} encoding
- * @return {void}
- */
-http.ClientRequest.prototype.end = function(data, encoding) {};
-
-/**
- * @interface
- * @extends {internal.Readable}
+ * @constructor
+ * @extends stream.Readable
 */
 http.IncomingMessage = function() {};

+/**
+ * @type {?string}
+ * */
+http.IncomingMessage.prototype.method;
+
+/**
+ * @type {?string}
+ */
+http.IncomingMessage.prototype.url;
+
+/**
+ * @type {Object}
+ * */
+http.IncomingMessage.prototype.headers;
+
+/**
+ * @type {Object}
+ * */
+http.IncomingMessage.prototype.trailers;
+
 /**
 * @type {string}
 */
@@ -458,105 +99,135 @@ http.IncomingMessage.prototype.httpVersionMajor;
 http.IncomingMessage.prototype.httpVersionMinor;

 /**
- * @type {net.Socket}
+ * @type {*}
 */
 http.IncomingMessage.prototype.connection;

 /**
- * @type {*}
- */
-http.IncomingMessage.prototype.headers;
-
-/**
- * @type {Array<string>}
- */
-http.IncomingMessage.prototype.rawHeaders;
-
-/**
- * @type {*}
- */
-http.IncomingMessage.prototype.trailers;
-
-/**
- * @type {*}
- */
-http.IncomingMessage.prototype.rawTrailers;
-
-/**
- * @param {number} msecs
- * @param {Function} callback
- * @return {NodeJS.Timer}
- */
-http.IncomingMessage.prototype.setTimeout = function(msecs, callback) {};
-
-/**
- * @type {string}
- */
-http.IncomingMessage.prototype.method;
-
-/**
- * @type {string}
- */
-http.IncomingMessage.prototype.url;
-
-/**
- * @type {number}
+ * @type {?number}
 */
 http.IncomingMessage.prototype.statusCode;

-/**
- * @type {string}
- */
-http.IncomingMessage.prototype.statusMessage;
-
 /**
 * @type {net.Socket}
 */
 http.IncomingMessage.prototype.socket;

 /**
- * @param {Error=} error
+ * @param {number} msecs
+ * @param {function()} callback
 * @return {void}
 */
-http.IncomingMessage.prototype.destroy = function(error) {};
+http.IncomingMessage.prototype.setTimeout;

 /**
- * @interface
- * @extends {http.IncomingMessage}
- */
-http.ClientResponse = function() {};
-
-/**
- * @interface
- */
-http.AgentOptions = function() {};
-
-/**
- * @type {boolean}
- */
-http.AgentOptions.prototype.keepAlive;
-
-/**
- * @type {number}
- */
-http.AgentOptions.prototype.keepAliveMsecs;
-
-/**
- * @type {number}
- */
-http.AgentOptions.prototype.maxSockets;
-
-/**
- * @type {number}
- */
-http.AgentOptions.prototype.maxFreeSockets;
-
-/**
- * @param {http.AgentOptions=} opts
- * @return {http.Agent}
 * @constructor
+ * @extends events.EventEmitter
+ * @private
 */
-http.Agent = function(opts) {};
+http.ServerResponse = function() {};
+
+/**
+ * @return {void}
+ */
+http.ServerResponse.prototype.writeContinue;
+
+/**
+ * @param {number} statusCode
+ * @param {*=} reasonPhrase
+ * @param {*=} headers
+ */
+http.ServerResponse.prototype.writeHead;
+
+/**
+ * @type {number}
+ */
+http.ServerResponse.prototype.statusCode;
+
+/**
+ * @param {string} name
+ * @param {string} value
+ * @return {void}
+ */
+http.ServerResponse.prototype.setHeader;
+
+/**
+ * @param {string} name
+ * @return {string|undefined} value
+ */
+http.ServerResponse.prototype.getHeader;
+
+/**
+ * @param {string} name
+ * @return {void}
+ */
+http.ServerResponse.prototype.removeHeader;
+
+/**
+ * @param {string|Array|Buffer} chunk
+ * @param {string=} encoding
+ * @return {void}
+ */
+http.ServerResponse.prototype.write;
+
+/**
+ * @param {Object} headers
+ * @return {void}
+ */
+http.ServerResponse.prototype.addTrailers;
+
+/**
+ * @param {(string|Array|Buffer)=} data
+ * @param {string=} encoding
+ * @return {void}
+ */
+http.ServerResponse.prototype.end;
+
+/**
+ * @constructor
+ * @extends events.EventEmitter
+ * @private
+ */
+http.ClientRequest = function() {};
+
+/**
+ * @param {string|Array|Buffer} chunk
+ * @param {string=} encoding
+ * @return {void}
+ */
+http.ClientRequest.prototype.write;
+
+/**
+ * @param {(string|Array|Buffer)=} data
+ * @param {string=} encoding
+ * @return {void}
+ */
+http.ClientRequest.prototype.end;
+
+/**
+ * @return {void}
+ */
+http.ClientRequest.prototype.abort;
+
+/**
+ * @param {Object} options
+ * @param {function(http.IncomingMessage)} callback
+ * @return {http.ClientRequest}
+ */
+http.request;
+
+/**
+ * @param {Object} options
+ * @param {function(http.IncomingMessage)} callback
+ * @return {http.ClientRequest}
+ */
+http.get;
+
+/**
+ * @constructor
+ * @extends events.EventEmitter
+ */
+http.Agent = function() {};

 /**
 * @type {number}
@@ -564,89 +235,18 @@ http.Agent = function(opts) {};
 http.Agent.prototype.maxSockets;

 /**
- * @type {*}
+ * @type {number}
 */
 http.Agent.prototype.sockets;

 /**
- * @type {*}
+ * @type {Array.<http.ClientRequest>}
 */
 http.Agent.prototype.requests;

-/**
- * @return {void}
- */
-http.Agent.prototype.destroy = function() {};
-
-/**
- * @type {Array<string>}
- */
-http.METHODS;
-
-http.STATUS_CODES;
-
-
-/**
- * @param {(function(http.IncomingMessage, http.ServerResponse): void)=} requestListener
- * @return {http.Server}
- */
-http.createServer = function(requestListener) {};
-
-/**
- * @param {number=} port
- * @param {string=} host
- * @return {*}
- */
-http.createClient = function(port, host) {};
-
-/**
- * @param {http.RequestOptions} options
- * @param {(function(http.IncomingMessage): void)=} callback
- * @return {http.ClientRequest}
- */
-http.request = function(options, callback) {};
-
-/**
- * @param {*} options
- * @param {(function(http.IncomingMessage): void)=} callback
- * @return {http.ClientRequest}
- */
-http.get = function(options, callback) {};
-
 /**
 * @type {http.Agent}
 */
 http.globalAgent;

-module.exports.RequestOptions = http.RequestOptions;
-
-module.exports.Server = http.Server;
-
-module.exports.ServerRequest = http.ServerRequest;
-
-module.exports.ServerResponse = http.ServerResponse;
-
-module.exports.ClientRequest = http.ClientRequest;
-
-module.exports.IncomingMessage = http.IncomingMessage;
-
-module.exports.ClientResponse = http.ClientResponse;
-
-module.exports.AgentOptions = http.AgentOptions;
-
-module.exports.Agent = http.Agent;
-
-module.exports.METHODS = http.METHODS;
-
-module.exports.STATUS_CODES = http.STATUS_CODES;
-
-module.exports.createServer = http.createServer;
-
-module.exports.createClient = http.createClient;
-
-module.exports.request = http.request;
-
-module.exports.get = http.get;
-
-module.exports.globalAgent = http.globalAgent;
-
+module.exports = http;
--- a/javascript/externs/nodejs/https.js
+++ b/javascript/externs/nodejs/https.js
@@ -1,270 +1,84 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "https"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's https module. Depends on the tls module.
+ * @see http://nodejs.org/api/https.html
+ * @see https://github.com/joyent/node/blob/master/lib/https.js
+ */
+
+var http = require('http');
+var tls = require('tls');
+
+/** @const */
 var https = {};

-var tls = require("tls");
-
-var http = require("http");
-
 /**
- * @interface
- */
-https.ServerOptions = function() {};
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.pfx;
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.key;
-
-/**
- * @type {string}
- */
-https.ServerOptions.prototype.passphrase;
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.cert;
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.ca;
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.crl;
-
-/**
- * @type {string}
- */
-https.ServerOptions.prototype.ciphers;
-
-/**
- * @type {boolean}
- */
-https.ServerOptions.prototype.honorCipherOrder;
-
-/**
- * @type {boolean}
- */
-https.ServerOptions.prototype.requestCert;
-
-/**
- * @type {boolean}
- */
-https.ServerOptions.prototype.rejectUnauthorized;
-
-/**
- * @type {*}
- */
-https.ServerOptions.prototype.NPNProtocols;
-
-/**
- * @type {(function(string, (function(Error, tls.SecureContext): *)): *)}
- */
-https.ServerOptions.prototype.SNICallback;
-
-/**
- * @interface
- * @extends {http.RequestOptions}
- */
-https.RequestOptions = function() {};
-
-/**
- * @type {*}
- */
-https.RequestOptions.prototype.pfx;
-
-/**
- * @type {*}
- */
-https.RequestOptions.prototype.key;
-
-/**
- * @type {string}
- */
-https.RequestOptions.prototype.passphrase;
-
-/**
- * @type {*}
- */
-https.RequestOptions.prototype.cert;
-
-/**
- * @type {*}
- */
-https.RequestOptions.prototype.ca;
-
-/**
- * @type {string}
- */
-https.RequestOptions.prototype.ciphers;
-
-/**
- * @type {boolean}
- */
-https.RequestOptions.prototype.rejectUnauthorized;
-
-/**
- * @type {string}
- */
-https.RequestOptions.prototype.secureProtocol;
-
-/**
- * @interface
- * @extends {http.Agent}
- */
-https.Agent = function() {};
-
-/**
- * @interface
- * @extends {http.AgentOptions}
- */
-https.AgentOptions = function() {};
-
-/**
- * @type {*}
- */
-https.AgentOptions.prototype.pfx;
-
-/**
- * @type {*}
- */
-https.AgentOptions.prototype.key;
-
-/**
- * @type {string}
- */
-https.AgentOptions.prototype.passphrase;
-
-/**
- * @type {*}
- */
-https.AgentOptions.prototype.cert;
-
-/**
- * @type {*}
- */
-https.AgentOptions.prototype.ca;
-
-/**
- * @type {string}
- */
-https.AgentOptions.prototype.ciphers;
-
-/**
- * @type {boolean}
- */
-https.AgentOptions.prototype.rejectUnauthorized;
-
-/**
- * @type {string}
- */
-https.AgentOptions.prototype.secureProtocol;
-
-/**
- * @type {number}
- */
-https.AgentOptions.prototype.maxCachedSessions;
-
-/**
- * @type {(function(new: https.Agent, https.AgentOptions=))}
- */
-https.Agent;
-
-/**
- * @interface
- * @extends {tls.Server}
+ * @constructor
+ * @extends tls.Server
 */
 https.Server = function() {};

 /**
- * @param {https.ServerOptions} options
- * @param {Function=} requestListener
- * @return {https.Server}
+ * @param {...*} var_args
+ * @return {void}
 */
-https.createServer = function(options, requestListener) {};
+https.Server.prototype.listen;

 /**
- * @param {https.RequestOptions} options
- * @param {(function(http.IncomingMessage): void)=} callback
- * @return {http.ClientRequest}
+ * @param {function()=} callback
+ * @return {void}
 */
-https.request = function(options, callback) {};
+https.Server.prototype.close;

 /**
- * @param {https.RequestOptions} options
- * @param {(function(http.IncomingMessage): void)=} callback
+ * @param {tls.CreateOptions} options
+ * @param {function(http.IncomingMessage, http.ServerResponse)=} requestListener
+ * @return {!https.Server}
+ */
+https.createServer;
+
+/**
+ * @typedef {{host: ?string, hostname: ?string, port: ?number, method: ?string, path: ?string, headers: ?Object.<string,string>, auth: ?string, agent: ?(https.Agent|boolean), pfx: ?(string|Buffer), key: ?(string|Buffer), passphrase: ?string, cert: ?(string|Buffer), ca: ?Array.<string>, ciphers: ?string, rejectUnauthorized: ?boolean}}
+ */
+https.ConnectOptions;
+
+/**
+ * @param {https.ConnectOptions|string} options
+ * @param {function(http.IncomingMessage)} callback
 * @return {http.ClientRequest}
 */
-https.get = function(options, callback) {};
+https.request;
+
+/**
+ * @param {https.ConnectOptions|string} options
+ * @param {function(http.IncomingMessage)} callback
+ * @return {http.ClientRequest}
+ */
+https.get;
+
+/**
+ * @constructor
+ * @extends http.Agent
+ */
+https.Agent = function() {};

 /**
 * @type {https.Agent}
 */
 https.globalAgent;

-module.exports.ServerOptions = https.ServerOptions;
-
-module.exports.RequestOptions = https.RequestOptions;
-
-module.exports.Agent = https.Agent;
-
-module.exports.AgentOptions = https.AgentOptions;
-
-module.exports.Agent = https.Agent;
-
-module.exports.Server = https.Server;
-
-module.exports.createServer = https.createServer;
-
-module.exports.request = https.request;
-
-module.exports.get = https.get;
-
-module.exports.globalAgent = https.globalAgent;
-
+module.exports = https;
--- a/javascript/externs/nodejs/net.js
+++ b/javascript/externs/nodejs/net.js
@@ -1,108 +1,116 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "net"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's net module. Depends on the events and buffer modules.
+ * @see http://nodejs.org/api/net.html
+ * @see https://github.com/joyent/node/blob/master/lib/net.js
+ */
+
+var events = require('events');
+
+/**
+ * @const
+ */
 var net = {};

 /**
- * @interface
- * @extends {internal.Duplex}
+ * @typedef {{allowHalfOpen: ?boolean}}
 */
-net.Socket = function() {};
+net.CreateOptions;

 /**
- * @param {Buffer} buffer
- * @return {boolean}
+ * @param {(net.CreateOptions|function(...))=} options
+ * @param {function(...)=} connectionListener
+ * @return {net.Server}
 */
-net.Socket.prototype.write = function(buffer) {};
+net.createServer;

 /**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {boolean}
+ * @typedef {{port: ?number, host: ?string, localAddress: ?string, path: ?string, allowHalfOpen: ?boolean}}
 */
-net.Socket.prototype.write = function(buffer, cb) {};
+net.ConnectOptions;

 /**
- * @param {string} str
- * @param {Function=} cb
- * @return {boolean}
- */
-net.Socket.prototype.write = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {boolean}
- */
-net.Socket.prototype.write = function(str, encoding, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {string=} fd
- * @return {boolean}
- */
-net.Socket.prototype.write = function(str, encoding, fd) {};
-
-/**
- * @param {*} data
- * @param {string=} encoding
- * @param {Function=} callback
+ * @param {net.ConnectOptions|number|string} arg1
+ * @param {(function(...)|string)=} arg2
+ * @param {function(...)=} arg3
 * @return {void}
 */
-net.Socket.prototype.write = function(data, encoding, callback) {};
+net.connect;

 /**
- * @param {number} port
- * @param {string=} host
- * @param {Function=} connectionListener
+ * @param {net.ConnectOptions|number|string} arg1
+ * @param {(function(...)|string)=} arg2
+ * @param {function(...)=} arg3
 * @return {void}
 */
-net.Socket.prototype.connect = function(port, host, connectionListener) {};
+net.createConnection;

 /**
- * @param {string} path
- * @param {Function=} connectionListener
+ * @constructor
+ * @extends events.EventEmitter
+ */
+net.Server = function() {};
+
+/**
+ *
+ * @param {number|*} port
+ * @param {(string|number|function(...))=} host
+ * @param {(number|function(...))=} backlog
+ * @param {function(...)=} callback
 * @return {void}
 */
-net.Socket.prototype.connect = function(path, connectionListener) {};
+net.Server.prototype.listen;
+
+/**
+ * @param {function(...)=} callback
+ * @return {void}
+ */
+net.Server.prototype.close;
+
+/**
+ * @return {{port: number, family: string, address: string}}
+ */
+net.Server.prototype.address;
+
+/**
+ * @type {number}
+ */
+net.Server.prototype.maxConnectinos;
+
+/**
+ * @type {number}
+ */
+net.Server.prototype.connections;
+
+/**
+ * @constructor
+ * @param {{fd: ?*, type: ?string, allowHalfOpen: ?boolean}=} options
+ * @extends events.EventEmitter
+ */
+net.Socket = function(options) {};
+
+/**
+ * @param {number|string|function(...)} port
+ * @param {(string|function(...))=} host
+ * @param {function(...)=} connectListener
+ * @return {void}
+ */
+net.Socket.prototype.connect;

 /**
 * @type {number}
@@ -110,10 +118,25 @@ net.Socket.prototype.connect = function(path, connectionListener) {};
 net.Socket.prototype.bufferSize;

 /**
+ * @param {?string=} encoding
+ * @return {void}
+ */
+net.Socket.prototype.setEncoding;
+
+/**
+ * @param {string|Buffer} data
+ * @param {(string|function(...))=}encoding
+ * @param {function(...)=} callback
+ * @return {void}
+ */
+net.Socket.prototype.write;
+
+/**
+ * @param {(string|Buffer)=}data
 * @param {string=} encoding
 * @return {void}
 */
-net.Socket.prototype.setEncoding = function(encoding) {};
+net.Socket.prototype.end;

 /**
 * @return {void}
@@ -121,75 +144,50 @@ net.Socket.prototype.setEncoding = function(encoding) {};
 net.Socket.prototype.destroy = function() {};

 /**
- * @return {net.Socket}
+ * @return {void}
 */
 net.Socket.prototype.pause = function() {};

 /**
- * @return {net.Socket}
+ * @return {void}
 */
-net.Socket.prototype.resume = function() {};
+net.Socket.prototype.resume;

 /**
 * @param {number} timeout
- * @param {Function=} callback
+ * @param {function(...)=} callback
 * @return {void}
 */
-net.Socket.prototype.setTimeout = function(timeout, callback) {};
+net.Socket.prototype.setTimeout;

 /**
 * @param {boolean=} noDelay
 * @return {void}
 */
-net.Socket.prototype.setNoDelay = function(noDelay) {};
+net.Socket.prototype.setNoDelay;

 /**
- * @param {boolean=} enable
+ * @param {(boolean|number)=} enable
 * @param {number=} initialDelay
 * @return {void}
 */
-net.Socket.prototype.setKeepAlive = function(enable, initialDelay) {};
+net.Socket.prototype.setKeepAlive;

 /**
- * @return {{port: number, family: string, address: string}}
+ * @return {string}
 */
-net.Socket.prototype.address = function() {};
+net.Socket.prototype.address;

 /**
- * @return {void}
- */
-net.Socket.prototype.unref = function() {};
-
-/**
- * @return {void}
- */
-net.Socket.prototype.ref = function() {};
-
-/**
- * @type {string}
+ * @type {?string}
 */
 net.Socket.prototype.remoteAddress;

 /**
- * @type {string}
- */
-net.Socket.prototype.remoteFamily;
-
-/**
- * @type {number}
+ * @type {?number}
 */
 net.Socket.prototype.remotePort;

-/**
- * @type {string}
- */
-net.Socket.prototype.localAddress;
-
-/**
- * @type {number}
- */
-net.Socket.prototype.localPort;
-
 /**
 * @type {number}
 */
@@ -201,288 +199,21 @@ net.Socket.prototype.bytesRead;
 net.Socket.prototype.bytesWritten;

 /**
- * @return {void}
- */
-net.Socket.prototype.end = function() {};
-
-/**
- * @param {Buffer} buffer
- * @param {Function=} cb
- * @return {void}
- */
-net.Socket.prototype.end = function(buffer, cb) {};
-
-/**
- * @param {string} str
- * @param {Function=} cb
- * @return {void}
- */
-net.Socket.prototype.end = function(str, cb) {};
-
-/**
- * @param {string} str
- * @param {string=} encoding
- * @param {Function=} cb
- * @return {void}
- */
-net.Socket.prototype.end = function(str, encoding, cb) {};
-
-/**
- * @param {*=} data
- * @param {string=} encoding
- * @return {void}
- */
-net.Socket.prototype.end = function(data, encoding) {};
-
-/**
- * @type {(function(new: net.Socket, {fd: string, type: string, allowHalfOpen: boolean}=))}
- */
-net.Socket;
-
-/**
- * @interface
- */
-net.ListenOptions = function() {};
-
-/**
- * @type {number}
- */
-net.ListenOptions.prototype.port;
-
-/**
- * @type {string}
- */
-net.ListenOptions.prototype.host;
-
-/**
- * @type {number}
- */
-net.ListenOptions.prototype.backlog;
-
-/**
- * @type {string}
- */
-net.ListenOptions.prototype.path;
-
-/**
- * @type {boolean}
- */
-net.ListenOptions.prototype.exclusive;
-
-/**
- * @interface
- * @extends {net.Socket}
- */
-net.Server = function() {};
-
-/**
- * @param {number} port
- * @param {string=} hostname
- * @param {number=} backlog
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(port, hostname, backlog, listeningListener) {};
-
-/**
- * @param {number} port
- * @param {string=} hostname
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(port, hostname, listeningListener) {};
-
-/**
- * @param {number} port
- * @param {number=} backlog
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(port, backlog, listeningListener) {};
-
-/**
- * @param {number} port
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(port, listeningListener) {};
-
-/**
- * @param {string} path
- * @param {number=} backlog
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(path, backlog, listeningListener) {};
-
-/**
- * @param {string} path
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(path, listeningListener) {};
-
-/**
- * @param {*} handle
- * @param {number=} backlog
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(handle, backlog, listeningListener) {};
-
-/**
- * @param {*} handle
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(handle, listeningListener) {};
-
-/**
- * @param {net.ListenOptions} options
- * @param {Function=} listeningListener
- * @return {net.Server}
- */
-net.Server.prototype.listen = function(options, listeningListener) {};
-
-/**
- * @param {Function=} callback
- * @return {net.Server}
- */
-net.Server.prototype.close = function(callback) {};
-
-/**
- * @return {{port: number, family: string, address: string}}
- */
-net.Server.prototype.address = function() {};
-
-/**
- * @param {(function(Error, number): void)} cb
- * @return {void}
- */
-net.Server.prototype.getConnections = function(cb) {};
-
-/**
- * @return {net.Server}
- */
-net.Server.prototype.ref = function() {};
-
-/**
- * @return {net.Server}
- */
-net.Server.prototype.unref = function() {};
-
-/**
- * @type {number}
- */
-net.Server.prototype.maxConnections;
-
-/**
- * @type {number}
- */
-net.Server.prototype.connections;
-
-/**
- * @param {(function(net.Socket): void)=} connectionListener
- * @return {net.Server}
- */
-net.createServer = function(connectionListener) {};
-
-/**
- * @param {{allowHalfOpen: boolean}=} options
- * @param {(function(net.Socket): void)=} connectionListener
- * @return {net.Server}
- */
-net.createServer = function(options, connectionListener) {};
-
-/**
- * @param {{port: number, host: string, localAddress: string, localPort: string, family: number, allowHalfOpen: boolean}} options
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.connect = function(options, connectionListener) {};
-
-/**
- * @param {number} port
- * @param {string=} host
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.connect = function(port, host, connectionListener) {};
-
-/**
- * @param {string} path
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.connect = function(path, connectionListener) {};
-
-/**
- * @param {{port: number, host: string, localAddress: string, localPort: string, family: number, allowHalfOpen: boolean}} options
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.createConnection = function(options, connectionListener) {};
-
-/**
- * @param {number} port
- * @param {string=} host
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.createConnection = function(port, host, connectionListener) {};
-
-/**
- * @param {string} path
- * @param {Function=} connectionListener
- * @return {net.Socket}
- */
-net.createConnection = function(path, connectionListener) {};
-
-/**
- * @param {string} input
+ * @param {*} input
 * @return {number}
 */
-net.isIP = function(input) {};
+net.isIP;

 /**
- * @param {string} input
+ * @param {*} input
 * @return {boolean}
 */
-net.isIPv4 = function(input) {};
+net.isIPv4;

 /**
- * @param {string} input
+ * @param {*} input
 * @return {boolean}
 */
-net.isIPv6 = function(input) {};
-
-module.exports.Socket = net.Socket;
-
-module.exports.Socket = net.Socket;
-
-module.exports.ListenOptions = net.ListenOptions;
-
-module.exports.Server = net.Server;
-
-module.exports.createServer = net.createServer;
-
-module.exports.createServer = net.createServer;
-
-module.exports.connect = net.connect;
-
-module.exports.connect = net.connect;
-
-module.exports.connect = net.connect;
-
-module.exports.createConnection = net.createConnection;
-
-module.exports.createConnection = net.createConnection;
-
-module.exports.createConnection = net.createConnection;
-
-module.exports.isIP = net.isIP;
-
-module.exports.isIPv4 = net.isIPv4;
-
-module.exports.isIPv6 = net.isIPv6;
+net.isIPv6;

+module.exports = net;
--- a/javascript/externs/nodejs/os.js
+++ b/javascript/externs/nodejs/os.js
@@ -1,258 +1,113 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "os"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's os module.
+ * @see http://nodejs.org/api/os.html
+ * @externs
+ */
+
+/** @const */
 var os = {};

 /**
- * @interface
+ * @return {string}
+ * @nosideeffects
 */
-os.CpuInfo = function() {};
-
-/**
- * @type {string}
- */
-os.CpuInfo.prototype.model;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.speed;
-
-os.CpuInfo.prototype.times;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.times.user;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.times.nice;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.times.sys;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.times.idle;
-
-/**
- * @type {number}
- */
-os.CpuInfo.prototype.times.irq;
-
-
-/**
- * @interface
- */
-os.NetworkInterfaceInfo = function() {};
-
-/**
- * @type {string}
- */
-os.NetworkInterfaceInfo.prototype.address;
-
-/**
- * @type {string}
- */
-os.NetworkInterfaceInfo.prototype.netmask;
-
-/**
- * @type {string}
- */
-os.NetworkInterfaceInfo.prototype.family;
-
-/**
- * @type {string}
- */
-os.NetworkInterfaceInfo.prototype.mac;
-
-/**
- * @type {boolean}
- */
-os.NetworkInterfaceInfo.prototype.internal;
+os.tmpdir;

 /**
 * @return {string}
+ * @nosideeffects
 */
-os.hostname = function() {};
+os.hostname;

 /**
- * @return {Array<number>}
+ * @return {string}
+ * @nosideeffects
 */
-os.loadavg = function() {};
+os.type;
+
+/**
+ * @return {string}
+ * @nosideeffects
+ */
+os.platform;
+
+/**
+ * @return {string}
+ * @nosideeffects
+ */
+os.arch;
+
+/**
+ * @return {string}
+ * @nosideeffects
+ */
+os.release;

 /**
 * @return {number}
+ * @nosideeffects
 */
-os.uptime = function() {};
+os.uptime;
+
+/**
+ * @return {Array.<number>}
+ * @nosideeffects
+ */
+os.loadavg;

 /**
 * @return {number}
+ * @nosideeffects
 */
-os.freemem = function() {};
+os.totalmem;

 /**
 * @return {number}
+ * @nosideeffects
 */
-os.totalmem = function() {};
+os.freemem;

 /**
- * @return {Array<os.CpuInfo>}
+ * @typedef {{model: string, speed: number, times: {user: number, nice: number, sys: number, idle: number, irg: number}}}
 */
-os.cpus = function() {};
+var osCpusInfo;

 /**
- * @return {string}
+ * @return {Array.<osCpusInfo>}
+ * @nosideeffects
 */
-os.type = function() {};
+os.cpus;

 /**
- * @return {string}
+ * @typedef {{address: string, family: string, internal: boolean}}
 */
-os.release = function() {};
+var osNetworkInterfacesInfo;

 /**
- * @return {Object<string,Array<os.NetworkInterfaceInfo>>}
+ * @return {Object.<string,osNetworkInterfacesInfo>}
+ * @nosideeffects
 */
-os.networkInterfaces = function() {};
-
-/**
- * @return {string}
- */
-os.homedir = function() {};
-
-/**
- * @param {{encoding: string}=} options
- * @return {{username: string, uid: number, gid: number, shell: *, homedir: string}}
- */
-os.userInfo = function(options) {};
-
-os.constants;
-
-/**
- * @type {number}
- */
-os.constants.UV_UDP_REUSEADDR;
-
-/**
- * @type {{SIGHUP: number, SIGINT: number, SIGQUIT: number, SIGILL: number, SIGTRAP: number, SIGABRT: number, SIGIOT: number, SIGBUS: number, SIGFPE: number, SIGKILL: number, SIGUSR1: number, SIGSEGV: number, SIGUSR2: number, SIGPIPE: number, SIGALRM: number, SIGTERM: number, SIGCHLD: number, SIGSTKFLT: number, SIGCONT: number, SIGSTOP: number, SIGTSTP: number, SIGTTIN: number, SIGTTOU: number, SIGURG: number, SIGXCPU: number, SIGXFSZ: number, SIGVTALRM: number, SIGPROF: number, SIGWINCH: number, SIGIO: number, SIGPOLL: number, SIGPWR: number, SIGSYS: number, SIGUNUSED: number}}
- */
-os.constants.errno;
-
-/**
- * @type {{E2BIG: number, EACCES: number, EADDRINUSE: number, EADDRNOTAVAIL: number, EAFNOSUPPORT: number, EAGAIN: number, EALREADY: number, EBADF: number, EBADMSG: number, EBUSY: number, ECANCELED: number, ECHILD: number, ECONNABORTED: number, ECONNREFUSED: number, ECONNRESET: number, EDEADLK: number, EDESTADDRREQ: number, EDOM: number, EDQUOT: number, EEXIST: number, EFAULT: number, EFBIG: number, EHOSTUNREACH: number, EIDRM: number, EILSEQ: number, EINPROGRESS: number, EINTR: number, EINVAL: number, EIO: number, EISCONN: number, EISDIR: number, ELOOP: number, EMFILE: number, EMLINK: number, EMSGSIZE: number, EMULTIHOP: number, ENAMETOOLONG: number, ENETDOWN: number, ENETRESET: number, ENETUNREACH: number, ENFILE: number, ENOBUFS: number, ENODATA: number, ENODEV: number, ENOENT: number, ENOEXEC: number, ENOLCK: number, ENOLINK: number, ENOMEM: number, ENOMSG: number, ENOPROTOOPT: number, ENOSPC: number, ENOSR: number, ENOSTR: number, ENOSYS: number, ENOTCONN: number, ENOTDIR: number, ENOTEMPTY: number, ENOTSOCK: number, ENOTSUP: number, ENOTTY: number, ENXIO: number, EOPNOTSUPP: number, EOVERFLOW: number, EPERM: number, EPIPE: number, EPROTO: number, EPROTONOSUPPORT: number, EPROTOTYPE: number, ERANGE: number, EROFS: number, ESPIPE: number, ESRCH: number, ESTALE: number, ETIME: number, ETIMEDOUT: number, ETXTBSY: number, EWOULDBLOCK: number, EXDEV: number}}
- */
-os.constants.signals;
-
-
-/**
- * @return {string}
- */
-os.arch = function() {};
-
-/**
- * @return {string}
- */
-os.platform = function() {};
-
-/**
- * @return {string}
- */
-os.tmpdir = function() {};
+os.networkInterfaces;

 /**
 * @type {string}
 */
 os.EOL;

-/**
- * @return {(string)}
- */
-os.endianness = function() {};
-
-module.exports.CpuInfo = os.CpuInfo;
-
-module.exports.NetworkInterfaceInfo = os.NetworkInterfaceInfo;
-
-module.exports.hostname = os.hostname;
-
-module.exports.loadavg = os.loadavg;
-
-module.exports.uptime = os.uptime;
-
-module.exports.freemem = os.freemem;
-
-module.exports.totalmem = os.totalmem;
-
-module.exports.cpus = os.cpus;
-
-module.exports.type = os.type;
-
-module.exports.release = os.release;
-
-module.exports.networkInterfaces = os.networkInterfaces;
-
-module.exports.homedir = os.homedir;
-
-module.exports.userInfo = os.userInfo;
-
-module.exports.constants = os.constants;
-
-module.exports.arch = os.arch;
-
-module.exports.platform = os.platform;
-
-module.exports.tmpdir = os.tmpdir;
-
-module.exports.EOL = os.EOL;
-
-module.exports.endianness = os.endianness;
-
-/**
- * @return {string}
- */
-os.tmpDir = function() {};
-
-module.exports.tmpDir = os.tmpDir;
-
+module.exports = os;
--- a/javascript/externs/nodejs/path.js
+++ b/javascript/externs/nodejs/path.js
@@ -1,129 +1,88 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */

 /**
+ * @fileoverview Definitions for node's path module.
 * @externs
- * @fileoverview Definitions for module "path"
+ * @see http://nodejs.org/api/path.html
 */

+/**
+ * @const
+ */
 var path = {};

-/**
- * @interface
- */
-path.ParsedPath = function() {};
-
-/**
- * @type {string}
- */
-path.ParsedPath.prototype.root;
-
-/**
- * @type {string}
- */
-path.ParsedPath.prototype.dir;
-
-/**
- * @type {string}
- */
-path.ParsedPath.prototype.base;
-
-/**
- * @type {string}
- */
-path.ParsedPath.prototype.ext;
-
-/**
- * @type {string}
- */
-path.ParsedPath.prototype.name;
-
 /**
 * @param {string} p
 * @return {string}
+ * @nosideeffects
 */
-path.normalize = function(p) {};
+path.normalize;

 /**
- * @param {...*} paths
+ * @param {...string} var_args
 * @return {string}
+ * @nosideeffects
 */
-path.join = function(paths) {};
+path.join;

 /**
- * @param {...string} paths
+ * @param {string} from
+ * @param {string=} to
 * @return {string}
+ * @nosideeffects
 */
-path.join = function(paths) {};
-
-/**
- * @param {...*} pathSegments
- * @return {string}
- */
-path.resolve = function(pathSegments) {};
-
-/**
- * @param {string} path
- * @return {boolean}
- */
-path.isAbsolute = function(path) {};
+path.resolve;

 /**
 * @param {string} from
 * @param {string} to
 * @return {string}
+ * @nosideeffects
 */
-path.relative = function(from, to) {};
+path.relative;

 /**
 * @param {string} p
 * @return {string}
+ * @nosideeffects
 */
-path.dirname = function(p) {};
+path.dirname;

 /**
 * @param {string} p
 * @param {string=} ext
 * @return {string}
+ * @nosideeffects
 */
-path.basename = function(p, ext) {};
+path.basename;

 /**
 * @param {string} p
 * @return {string}
+ * @nosideeffects
 */
-path.extname = function(p) {};
+path.extname;
+
+/**
+ * @param {string} p
+ * @return {boolean}
+ * @nosideeffects
+ */
+path.isAbsolute;

 /**
 * @type {string}
@@ -135,222 +94,4 @@ path.sep;
 */
 path.delimiter;

-/**
- * @param {string} pathString
- * @return {path.ParsedPath}
- */
-path.parse = function(pathString) {};
-
-/**
- * @param {path.ParsedPath} pathObject
- * @return {string}
- */
-path.format = function(pathObject) {};
-
-path.posix = path.posix || {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.posix.normalize = function(p) {};
-
-/**
- * @param {...*} paths
- * @return {string}
- */
-path.posix.join = function(paths) {};
-
-/**
- * @param {...*} pathSegments
- * @return {string}
- */
-path.posix.resolve = function(pathSegments) {};
-
-/**
- * @param {string} p
- * @return {boolean}
- */
-path.posix.isAbsolute = function(p) {};
-
-/**
- * @param {string} from
- * @param {string} to
- * @return {string}
- */
-path.posix.relative = function(from, to) {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.posix.dirname = function(p) {};
-
-/**
- * @param {string} p
- * @param {string=} ext
- * @return {string}
- */
-path.posix.basename = function(p, ext) {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.posix.extname = function(p) {};
-
-/**
- * @type {string}
- */
-path.posix.sep;
-
-/**
- * @type {string}
- */
-path.posix.delimiter;
-
-/**
- * @param {string} p
- * @return {path.ParsedPath}
- */
-path.posix.parse = function(p) {};
-
-/**
- * @param {path.ParsedPath} pP
- * @return {string}
- */
-path.posix.format = function(pP) {};
-
-
-path.win32 = path.win32 || {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.win32.normalize = function(p) {};
-
-/**
- * @param {...*} paths
- * @return {string}
- */
-path.win32.join = function(paths) {};
-
-/**
- * @param {...*} pathSegments
- * @return {string}
- */
-path.win32.resolve = function(pathSegments) {};
-
-/**
- * @param {string} p
- * @return {boolean}
- */
-path.win32.isAbsolute = function(p) {};
-
-/**
- * @param {string} from
- * @param {string} to
- * @return {string}
- */
-path.win32.relative = function(from, to) {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.win32.dirname = function(p) {};
-
-/**
- * @param {string} p
- * @param {string=} ext
- * @return {string}
- */
-path.win32.basename = function(p, ext) {};
-
-/**
- * @param {string} p
- * @return {string}
- */
-path.win32.extname = function(p) {};
-
-/**
- * @type {string}
- */
-path.win32.sep;
-
-/**
- * @type {string}
- */
-path.win32.delimiter;
-
-/**
- * @param {string} p
- * @return {path.ParsedPath}
- */
-path.win32.parse = function(p) {};
-
-/**
- * @param {path.ParsedPath} pP
- * @return {string}
- */
-path.win32.format = function(pP) {};
-
-
-module.exports.ParsedPath = path.ParsedPath;
-
-module.exports.normalize = path.normalize;
-
-module.exports.join = path.join;
-
-module.exports.join = path.join;
-
-module.exports.resolve = path.resolve;
-
-module.exports.isAbsolute = path.isAbsolute;
-
-module.exports.relative = path.relative;
-
-module.exports.dirname = path.dirname;
-
-module.exports.basename = path.basename;
-
-module.exports.extname = path.extname;
-
-module.exports.sep = path.sep;
-
-module.exports.delimiter = path.delimiter;
-
-module.exports.parse = path.parse;
-
-module.exports.format = path.format;
-
-module.exports.posix = path.posix;
-
-module.exports.win32 = path.win32;
-
-/**
- * @param {string} path
- * @return {string}
- */
-path._makeLong = function(path) {};
-
-module.exports._makeLong = path._makeLong;
-
-/**
- * @param {string} path
- * @param {(function(boolean): *)} callback
- * @return {boolean}
- */
-path.exists = function(path, callback) {};
-
-/**
- * @param {string} path
- * @return {boolean}
- */
-path.existsSync = function(path) {};
-
-module.exports.exists = path.exists;
-
-module.exports.existsSync = path.existsSync;
-
+module.exports = path;
--- a/javascript/externs/nodejs/punycode.js
+++ b/javascript/externs/nodejs/punycode.js
@@ -1,104 +1,74 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "punycode"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's punycode module.
+ * @see http://nodejs.org/api/punycode.html
+ * @see https://github.com/joyent/node/blob/master/lib/punycode.js
+ */
+
+/**
+ * @const
+ */
 var punycode = {};

 /**
 * @param {string} string
 * @return {string}
 */
-punycode.decode = function(string) {};
+punycode.decode;

 /**
 * @param {string} string
 * @return {string}
 */
-punycode.encode = function(string) {};
+punycode.encode;

 /**
 * @param {string} domain
 * @return {string}
 */
-punycode.toUnicode = function(domain) {};
+punycode.toUnicode;

 /**
 * @param {string} domain
 * @return {string}
 */
-punycode.toASCII = function(domain) {};
+punycode.toASCII;

 /**
- * @type {punycode.ucs2}
+ * @type {Object.<string,*>}
 */
-punycode.ucs2;
-
-/**
- * @interface
- */
-function ucs2() {}
+punycode.ucs2 = {};

 /**
 * @param {string} string
- * @return {Array<number>}
+ * @return {Array.<number>}
 */
-ucs2.prototype.decode = function(string) {};
+punycode.ucs2.decode;

 /**
- * @param {Array<number>} codePoints
+ * @param {Array.<number>} codePoints
 * @return {string}
 */
-ucs2.prototype.encode = function(codePoints) {};
+punycode.ucs2.encode;

 /**
- * @type {*}
+ * @type {string}
 */
 punycode.version;

-module.exports.decode = punycode.decode;
-
-module.exports.encode = punycode.encode;
-
-module.exports.toUnicode = punycode.toUnicode;
-
-module.exports.toASCII = punycode.toASCII;
-
-module.exports.ucs2 = punycode.ucs2;
-
-module.exports.version = punycode.version;
-
+module.exports = punycode;
--- a/javascript/externs/nodejs/querystring.js
+++ b/javascript/externs/nodejs/querystring.js
@@ -1,130 +1,66 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "querystring"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's querystring module.
+ * @see http://nodejs.org/api/querystring.html
+ * @see https://github.com/joyent/node/blob/master/lib/querystring.js
+ */
+
+/**
+ * @const
+ */
 var querystring = {};

 /**
- * @interface
- */
-querystring.StringifyOptions = function() {};
-
-/**
- * @type {Function}
- */
-querystring.StringifyOptions.prototype.encodeURIComponent;
-
-/**
- * @interface
- */
-querystring.ParseOptions = function() {};
-
-/**
- * @type {number}
- */
-querystring.ParseOptions.prototype.maxKeys;
-
-/**
- * @type {Function}
- */
-querystring.ParseOptions.prototype.decodeURIComponent;
-
-/**
- * @template T
- * @param {T} obj
+ * @param {Object.<string,*>} obj
 * @param {string=} sep
 * @param {string=} eq
- * @param {querystring.StringifyOptions=} options
 * @return {string}
+ * @nosideeffects
 */
-querystring.stringify = function(obj, sep, eq, options) {};
+querystring.stringify;

 /**
 * @param {string} str
 * @param {string=} sep
 * @param {string=} eq
- * @param {querystring.ParseOptions=} options
- * @return {*}
+ * @param {*=} options
+ * @return {Object.<string|!Array.<string>>}
+ * @nosideeffects
 */
-querystring.parse = function(str, sep, eq, options) {};
-
-/**
- * @template T
- * @param {string} str
- * @param {string=} sep
- * @param {string=} eq
- * @param {querystring.ParseOptions=} options
- * @return {T}
- */
-querystring.parse = function(str, sep, eq, options) {};
+querystring.parse;

 /**
 * @param {string} str
 * @return {string}
 */
-querystring.escape = function(str) {};
+querystring.escape;

 /**
 * @param {string} str
 * @return {string}
 */
-querystring.unescape = function(str) {};
-
-module.exports.StringifyOptions = querystring.StringifyOptions;
-
-module.exports.ParseOptions = querystring.ParseOptions;
-
-module.exports.stringify = querystring.stringify;
-
-module.exports.parse = querystring.parse;
-
-module.exports.parse = querystring.parse;
-
-module.exports.escape = querystring.escape;
-
-module.exports.unescape = querystring.unescape;
+querystring.unescape;

 /**
 * @param {Buffer} s
 * @param {boolean} decodeSpaces
 * @return {void}
 */
-querystring.unescapeBuffer = function(s, decodeSpaces) {};
-
-module.exports.unescapeBuffer = querystring.unescapeBuffer;
+querystring.unescapeBuffer;

+module.exports = querystring;
--- a/javascript/externs/nodejs/readline.js
+++ b/javascript/externs/nodejs/readline.js
@@ -1,247 +1,84 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "readline"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's readline module. Depends on the events module.
+ * @see http://nodejs.org/api/readline.html
+ */
+
+var events = require('events');
+var stream = require('stream');
+
+/**
+ * @const
+ */
 var readline = {};

-var events = require("events");
-
-var stream = require("stream");
+/**
+ * @param {{input: stream.ReadableStream, output: stream.WritableStream, completer: function(string, function(*, Array)=), terminal: boolean}} options
+ * @return {readline.Interface}
+ */
+readline.createInterface;

 /**
- * @interface
+ * @constructor
+ * @extends events.EventEmitter
 */
-readline.Key = function() {};
-
-/**
- * @type {string}
- */
-readline.Key.prototype.sequence;
-
-/**
- * @type {string}
- */
-readline.Key.prototype.name;
-
-/**
- * @type {boolean}
- */
-readline.Key.prototype.ctrl;
-
-/**
- * @type {boolean}
- */
-readline.Key.prototype.meta;
-
-/**
- * @type {boolean}
- */
-readline.Key.prototype.shift;
-
-/**
- * @interface
- * @extends {events.EventEmitter}
- */
-readline.ReadLine = function() {};
+readline.Interface = function() {};

 /**
 * @param {string} prompt
+ * @param {number} length
 * @return {void}
 */
-readline.ReadLine.prototype.setPrompt = function(prompt) {};
+readline.Interface.prototype.setPrompt;

 /**
 * @param {boolean=} preserveCursor
 * @return {void}
 */
-readline.ReadLine.prototype.prompt = function(preserveCursor) {};
+readline.Interface.prototype.prompt;

 /**
 * @param {string} query
- * @param {(function(string): void)} callback
+ * @param {function(string)} callback
 * @return {void}
 */
-readline.ReadLine.prototype.question = function(query, callback) {};
-
-/**
- * @return {readline.ReadLine}
- */
-readline.ReadLine.prototype.pause = function() {};
-
-/**
- * @return {readline.ReadLine}
- */
-readline.ReadLine.prototype.resume = function() {};
+readline.Interface.prototype.question;

 /**
 * @return {void}
 */
-readline.ReadLine.prototype.close = function() {};
+readline.Interface.prototype.pause;

 /**
- * @param {(string|Buffer)} data
- * @param {readline.Key=} key
 * @return {void}
 */
-readline.ReadLine.prototype.write = function(data, key) {};
+readline.Interface.prototype.resume;

 /**
- * @interface
- * @type {((function(string): readline.CompleterResult)|(function(string, (function(*, readline.CompleterResult): void)): *))}
- */
-readline.Completer = function() {};
-
-/**
- * @interface
- */
-readline.CompleterResult = function() {};
-
-/**
- * @type {Array<string>}
- */
-readline.CompleterResult.prototype.completions;
-
-/**
- * @type {string}
- */
-readline.CompleterResult.prototype.line;
-
-/**
- * @interface
- */
-readline.ReadLineOptions = function() {};
-
-/**
- * @type {NodeJS.ReadableStream}
- */
-readline.ReadLineOptions.prototype.input;
-
-/**
- * @type {NodeJS.WritableStream}
- */
-readline.ReadLineOptions.prototype.output;
-
-/**
- * @type {readline.Completer}
- */
-readline.ReadLineOptions.prototype.completer;
-
-/**
- * @type {boolean}
- */
-readline.ReadLineOptions.prototype.terminal;
-
-/**
- * @type {number}
- */
-readline.ReadLineOptions.prototype.historySize;
-
-/**
- * @param {NodeJS.ReadableStream} input
- * @param {NodeJS.WritableStream=} output
- * @param {readline.Completer=} completer
- * @param {boolean=} terminal
- * @return {readline.ReadLine}
- */
-readline.createInterface = function(input, output, completer, terminal) {};
-
-/**
- * @param {readline.ReadLineOptions} options
- * @return {readline.ReadLine}
- */
-readline.createInterface = function(options) {};
-
-/**
- * @param {NodeJS.WritableStream} stream
- * @param {number} x
- * @param {number} y
 * @return {void}
 */
-readline.cursorTo = function(stream, x, y) {};
+readline.Interface.prototype.close;

 /**
- * @param {NodeJS.WritableStream} stream
- * @param {(number|string)} dx
- * @param {(number|string)} dy
+ * @param {string} data
+ * @param {Object.<string,*>=} key
 * @return {void}
 */
-readline.moveCursor = function(stream, dx, dy) {};
-
-/**
- * @param {NodeJS.WritableStream} stream
- * @param {number} dir
- * @return {void}
- */
-readline.clearLine = function(stream, dir) {};
-
-/**
- * @param {NodeJS.WritableStream} stream
- * @return {void}
- */
-readline.clearScreenDown = function(stream) {};
-
-module.exports.Key = readline.Key;
-
-module.exports.ReadLine = readline.ReadLine;
-
-module.exports.Completer = readline.Completer;
-
-module.exports.CompleterResult = readline.CompleterResult;
-
-module.exports.ReadLineOptions = readline.ReadLineOptions;
-
-module.exports.createInterface = readline.createInterface;
-
-module.exports.createInterface = readline.createInterface;
-
-module.exports.cursorTo = readline.cursorTo;
-
-module.exports.moveCursor = readline.moveCursor;
-
-module.exports.clearLine = readline.clearLine;
-
-module.exports.clearScreenDown = readline.clearScreenDown;
-
-/**
- * @interface
- * @extends {readline.ReadLine}
- */
-readline.Interface = function() {};
-
-module.exports.Interface = readline.Interface;
+readline.Interface.prototype.write;

+module.exports = readline;
--- a/javascript/externs/nodejs/repl.js
+++ b/javascript/externs/nodejs/repl.js
@@ -1,149 +1,48 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "repl"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's repl module. Depends on the events and stream modules.
+ * @see http://nodejs.org/api/repl.html
+ * @see https://github.com/joyent/node/blob/master/lib/repl.js
+ */
+
+var events = require('events');
+var stream = require('stream');
+
+/**
+ * @const
+ */
 var repl = {};

-var readline = require("readline");
-
 /**
- * @interface
- */
-repl.ReplOptions = function() {};
-
-/**
- * @type {string}
- */
-repl.ReplOptions.prototype.prompt;
-
-/**
- * @type {NodeJS.ReadableStream}
- */
-repl.ReplOptions.prototype.input;
-
-/**
- * @type {NodeJS.WritableStream}
- */
-repl.ReplOptions.prototype.output;
-
-/**
- * @type {boolean}
- */
-repl.ReplOptions.prototype.terminal;
-
-/**
- * @type {Function}
- */
-repl.ReplOptions.prototype.eval;
-
-/**
- * @type {boolean}
- */
-repl.ReplOptions.prototype.useColors;
-
-/**
- * @type {boolean}
- */
-repl.ReplOptions.prototype.useGlobal;
-
-/**
- * @type {boolean}
- */
-repl.ReplOptions.prototype.ignoreUndefined;
-
-/**
- * @type {Function}
- */
-repl.ReplOptions.prototype.writer;
-
-/**
- * @type {Function}
- */
-repl.ReplOptions.prototype.completer;
-
-/**
- * @type {*}
- */
-repl.ReplOptions.prototype.replMode;
-
-/**
- * @type {*}
- */
-repl.ReplOptions.prototype.breakEvalOnSigint;
-
-/**
- * @interface
- * @extends {readline.ReadLine}
- */
-repl.REPLServer = function() {};
-
-/**
- * @param {string} keyword
- * @param {(Function|{help: string, action: Function})} cmd
- * @return {void}
- */
-repl.REPLServer.prototype.defineCommand = function(keyword, cmd) {};
-
-/**
- * @param {boolean=} preserveCursor
- * @return {void}
- */
-repl.REPLServer.prototype.displayPrompt = function(preserveCursor) {};
-
-/**
- * @param {repl.ReplOptions} options
+ * @param {{prompt: ?string, input: ?stream.Readable, output: ?stream.Writable, terminal: ?boolean, eval: ?function(string), useColors: ?boolean, useGlobal: ?boolean, ignoreUndefined: ?boolean, writer: ?function(string)}} options
 * @return {repl.REPLServer}
 */
-repl.start = function(options) {};
-
-module.exports.ReplOptions = repl.ReplOptions;
-
-module.exports.REPLServer = repl.REPLServer;
-
-module.exports.start = repl.start;
+repl.start;

 /**
- * @interface
+ * @constructor
+ * @extends events.EventEmitter
 */
 repl.REPLServer = function() {};

+/**
+ * @type {Object.<string,*>}
+ */
 repl.REPLServer.prototype.context;

-
-module.exports.REPLServer = repl.REPLServer;
-
+module.exports = repl;
--- a/javascript/externs/nodejs/stream.js
+++ b/javascript/externs/nodejs/stream.js
--- a/javascript/externs/nodejs/string_decoder.js
+++ b/javascript/externs/nodejs/string_decoder.js
@@ -1,80 +1,52 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "string_decoder"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

-var string_decoder = {};
+/**
+ * @fileoverview Definitions for node's string_decoder module. Depends on the buffer module.
+ * @see http://nodejs.org/api/string_decoder.html
+ * @see https://github.com/joyent/node/blob/master/lib/string_decoder.js
+ */

 /**
- * @interface
+ * @param {string} encoding
+ * @constructor
 */
-string_decoder.NodeStringDecoder = function() {};
+var StringDecoder = function(encoding) {};

 /**
 * @param {Buffer} buffer
 * @return {string}
 */
-string_decoder.NodeStringDecoder.prototype.write = function(buffer) {};
+StringDecoder.prototype.write;

 /**
- * @param {Buffer=} buffer
 * @return {string}
 */
-string_decoder.NodeStringDecoder.prototype.end = function(buffer) {};
-
-/**
- * @type {(function(new: string_decoder.NodeStringDecoder, string=))}
- */
-string_decoder.StringDecoder;
-
-module.exports.NodeStringDecoder = string_decoder.NodeStringDecoder;
-
-module.exports.StringDecoder = string_decoder.StringDecoder;
-
-/**
- * @interface
- */
-string_decoder.NodeStringDecoder = function() {};
+StringDecoder.prototype.toString;

 /**
 * @param {Buffer} buffer
 * @return {number}
 */
-string_decoder.NodeStringDecoder.prototype.detectIncompleteChar = function(buffer) {};
+StringDecoder.prototype.detectIncompleteChar;

-module.exports.NodeStringDecoder = string_decoder.NodeStringDecoder;
+/**
+ * @param {Buffer} buffer
+ * @return {string}
+ */
+StringDecoder.prototype.end;

+module.exports = StringDecoder;
--- a/javascript/externs/nodejs/tls.js
+++ b/javascript/externs/nodejs/tls.js
@@ -1,598 +1,80 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "tls"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's tls module. Depends on the stream module.
+ * @see http://nodejs.org/api/tls.html
+ * @see https://github.com/joyent/node/blob/master/lib/tls.js
+ */
+
+var crypto = require('crypto');
+var events = require('events');
+var net = require('net');
+var stream = require('stream');
+
+/**
+ * @const
+ */
 var tls = {};

-var crypto = require("crypto");
-
-var net = require("net");
-
-/**
- * @type {number}
- */
-var CLIENT_RENEG_LIMIT;
-
-/**
- * @type {number}
- */
-var CLIENT_RENEG_WINDOW;
-
-/**
- * @interface
- */
-tls.Certificate = function() {};
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.C;
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.ST;
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.L;
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.O;
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.OU;
-
-/**
- * @type {string}
- */
-tls.Certificate.prototype.CN;
-
-/**
- * @interface
- */
-tls.CipherNameAndProtocol = function() {};
-
-/**
- * @type {string}
- */
-tls.CipherNameAndProtocol.prototype.name;
-
-/**
- * @type {string}
- */
-tls.CipherNameAndProtocol.prototype.version;
-
 /**
 * @constructor
- * @extends {internal.Duplex}
 */
-tls.TLSSocket;
-
-/**
- * @return {{port: number, family: string, address: string}}
- */
-tls.TLSSocket.prototype.address = function() {};
-
-/**
- * @type {boolean}
- */
-tls.TLSSocket.prototype.authorized;
-
-/**
- * @type {Error}
- */
-tls.TLSSocket.prototype.authorizationError;
-
-/**
- * @type {boolean}
- */
-tls.TLSSocket.prototype.encrypted;
-
-/**
- * @return {tls.CipherNameAndProtocol}
- */
-tls.TLSSocket.prototype.getCipher = function() {};
-
-/**
- * @param {boolean=} detailed
- * @return {{subject: tls.Certificate, issuerInfo: tls.Certificate, issuer: tls.Certificate, raw: *, valid_from: string, valid_to: string, fingerprint: string, serialNumber: string}}
- */
-tls.TLSSocket.prototype.getPeerCertificate = function(detailed) {};
-
-/**
- * @return {*}
- */
-tls.TLSSocket.prototype.getSession = function() {};
-
-/**
- * @return {*}
- */
-tls.TLSSocket.prototype.getTLSTicket = function() {};
-
-/**
- * @type {string}
- */
-tls.TLSSocket.prototype.localAddress;
-
-/**
- * @type {string}
- */
-tls.TLSSocket.prototype.localPort;
-
-/**
- * @type {string}
- */
-tls.TLSSocket.prototype.remoteAddress;
-
-/**
- * @type {string}
- */
-tls.TLSSocket.prototype.remoteFamily;
-
-/**
- * @type {number}
- */
-tls.TLSSocket.prototype.remotePort;
-
-/**
- * @param {tls.TlsOptions} options
- * @param {(function(Error): *)} callback
- * @return {*}
- */
-tls.TLSSocket.prototype.renegotiate = function(options, callback) {};
-
-/**
- * @param {number} size
- * @return {boolean}
- */
-tls.TLSSocket.prototype.setMaxSendFragment = function(size) {};
-
-/**
- * @interface
- */
-tls.TlsOptions = function() {};
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.host;
-
-/**
- * @type {number}
- */
-tls.TlsOptions.prototype.port;
-
-/**
- * @type {(string|Array<Buffer>)}
- */
-tls.TlsOptions.prototype.pfx;
-
-/**
- * @type {(string|Array<string>|Buffer|Array<*>)}
- */
-tls.TlsOptions.prototype.key;
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.passphrase;
-
-/**
- * @type {(string|Array<string>|Buffer|Array<Buffer>)}
- */
-tls.TlsOptions.prototype.cert;
-
-/**
- * @type {(string|Array<string>|Buffer|Array<Buffer>)}
- */
-tls.TlsOptions.prototype.ca;
-
-/**
- * @type {(string|Array<string>)}
- */
-tls.TlsOptions.prototype.crl;
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.ciphers;
-
-/**
- * @type {boolean}
- */
-tls.TlsOptions.prototype.honorCipherOrder;
-
-/**
- * @type {boolean}
- */
-tls.TlsOptions.prototype.requestCert;
-
-/**
- * @type {boolean}
- */
-tls.TlsOptions.prototype.rejectUnauthorized;
-
-/**
- * @type {(Array<string>|Buffer)}
- */
-tls.TlsOptions.prototype.NPNProtocols;
-
-/**
- * @type {(function(string, (function(Error, tls.SecureContext): *)): *)}
- */
-tls.TlsOptions.prototype.SNICallback;
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.ecdhCurve;
-
-/**
- * @type {(string|Buffer)}
- */
-tls.TlsOptions.prototype.dhparam;
-
-/**
- * @type {number}
- */
-tls.TlsOptions.prototype.handshakeTimeout;
-
-/**
- * @type {(Array<string>|Buffer)}
- */
-tls.TlsOptions.prototype.ALPNProtocols;
-
-/**
- * @type {number}
- */
-tls.TlsOptions.prototype.sessionTimeout;
-
-/**
- * @type {*}
- */
-tls.TlsOptions.prototype.ticketKeys;
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.sessionIdContext;
-
-/**
- * @type {string}
- */
-tls.TlsOptions.prototype.secureProtocol;
-
-/**
- * @interface
- */
-tls.ConnectionOptions = function() {};
-
-/**
- * @type {string}
- */
-tls.ConnectionOptions.prototype.host;
-
-/**
- * @type {number}
- */
-tls.ConnectionOptions.prototype.port;
-
-/**
- * @type {net.Socket}
- */
-tls.ConnectionOptions.prototype.socket;
-
-/**
- * @type {(string|Buffer)}
- */
-tls.ConnectionOptions.prototype.pfx;
-
-/**
- * @type {(string|Array<string>|Buffer|Array<Buffer>)}
- */
-tls.ConnectionOptions.prototype.key;
-
-/**
- * @type {string}
- */
-tls.ConnectionOptions.prototype.passphrase;
-
-/**
- * @type {(string|Array<string>|Buffer|Array<Buffer>)}
- */
-tls.ConnectionOptions.prototype.cert;
-
-/**
- * @type {(string|Buffer|Array<(string|Buffer)>)}
- */
-tls.ConnectionOptions.prototype.ca;
-
-/**
- * @type {boolean}
- */
-tls.ConnectionOptions.prototype.rejectUnauthorized;
-
-/**
- * @type {Array<(string|Buffer)>}
- */
-tls.ConnectionOptions.prototype.NPNProtocols;
-
-/**
- * @type {string}
- */
-tls.ConnectionOptions.prototype.servername;
-
-/**
- * @type {string}
- */
-tls.ConnectionOptions.prototype.path;
-
-/**
- * @type {Array<(string|Buffer)>}
- */
-tls.ConnectionOptions.prototype.ALPNProtocols;
-
-/**
- * @type {(function(string, (string|Buffer|Array<(string|Buffer)>)): *)}
- */
-tls.ConnectionOptions.prototype.checkServerIdentity;
-
-/**
- * @type {string}
- */
-tls.ConnectionOptions.prototype.secureProtocol;
-
-/**
- * @type {Object}
- */
-tls.ConnectionOptions.prototype.secureContext;
-
-/**
- * @type {Buffer}
- */
-tls.ConnectionOptions.prototype.session;
-
-/**
- * @type {number}
- */
-tls.ConnectionOptions.prototype.minDHSize;
-
-/**
- * @interface
- * @extends {net.Server}
- */
-tls.Server = function() {};
+tls.CreateOptions = function () {};
+
+/** @type {boolean} */
+tls.CreateOptions.prototype.honorCipherOrder;
+
+/** @type {boolean} */
+tls.CreateOptions.prototype.requestCert;
+
+/** @type {boolean} */
+tls.CreateOptions.prototype.rejectUnauthorized;
+
+/** @type {Array|Buffer} */
+tls.CreateOptions.prototype.NPNProtocols;
+
+/** @type {function(string)} */
+tls.CreateOptions.prototype.SNICallback;
+
+/** @type {string} */
+tls.CreateOptions.prototype.sessionIdContext;

 /**
+ *
+ * @param {tls.CreateOptions} options
+ * @param {function(...)=} secureConnectionListener
 * @return {tls.Server}
 */
-tls.Server.prototype.close = function() {};
+tls.createServer;

 /**
- * @return {{port: number, family: string, address: string}}
+ * @typedef {{host: string, port: number, socket: *, pfx: (string|Buffer), key: (string|Buffer), passphrase: string, cert: (string|Buffer), ca: Array.<string>, rejectUnauthorized: boolean, NPNProtocols: Array.<string|Buffer>, servername: string}}
 */
-tls.Server.prototype.address = function() {};
+tls.ConnectOptions;

 /**
- * @param {string} hostName
- * @param {{key: string, cert: string, ca: string}} credentials
+ *
+ * @param {number|tls.ConnectOptions} port
+ * @param {(string|tls.ConnectOptions|function(...))=} host
+ * @param {(tls.ConnectOptions|function(...))=} options
+ * @param {function(...)=} callback
 * @return {void}
 */
-tls.Server.prototype.addContext = function(hostName, credentials) {};
-
-/**
- * @type {number}
- */
-tls.Server.prototype.maxConnections;
-
-/**
- * @type {number}
- */
-tls.Server.prototype.connections;
-
-/**
- * @interface
- * @extends {internal.Duplex}
- */
-tls.ClearTextStream = function() {};
-
-/**
- * @type {boolean}
- */
-tls.ClearTextStream.prototype.authorized;
-
-/**
- * @type {Error}
- */
-tls.ClearTextStream.prototype.authorizationError;
-
-/**
- * @return {*}
- */
-tls.ClearTextStream.prototype.getPeerCertificate = function() {};
-
-tls.ClearTextStream.prototype.getCipher;
-
-/**
- * @type {string}
- */
-tls.ClearTextStream.prototype.getCipher.name;
-
-/**
- * @type {string}
- */
-tls.ClearTextStream.prototype.getCipher.version;
-
-
-tls.ClearTextStream.prototype.address;
-
-/**
- * @type {number}
- */
-tls.ClearTextStream.prototype.address.port;
-
-/**
- * @type {string}
- */
-tls.ClearTextStream.prototype.address.family;
-
-/**
- * @type {string}
- */
-tls.ClearTextStream.prototype.address.address;
-
-
-/**
- * @type {string}
- */
-tls.ClearTextStream.prototype.remoteAddress;
-
-/**
- * @type {number}
- */
-tls.ClearTextStream.prototype.remotePort;
-
-/**
- * @interface
- */
-tls.SecurePair = function() {};
-
-/**
- * @type {*}
- */
-tls.SecurePair.prototype.encrypted;
-
-/**
- * @type {*}
- */
-tls.SecurePair.prototype.cleartext;
-
-/**
- * @interface
- */
-tls.SecureContextOptions = function() {};
-
-/**
- * @type {(string|Buffer)}
- */
-tls.SecureContextOptions.prototype.pfx;
-
-/**
- * @type {(string|Buffer)}
- */
-tls.SecureContextOptions.prototype.key;
-
-/**
- * @type {string}
- */
-tls.SecureContextOptions.prototype.passphrase;
-
-/**
- * @type {(string|Buffer)}
- */
-tls.SecureContextOptions.prototype.cert;
-
-/**
- * @type {(string|Buffer)}
- */
-tls.SecureContextOptions.prototype.ca;
-
-/**
- * @type {(string|Array<string>)}
- */
-tls.SecureContextOptions.prototype.crl;
-
-/**
- * @type {string}
- */
-tls.SecureContextOptions.prototype.ciphers;
-
-/**
- * @type {boolean}
- */
-tls.SecureContextOptions.prototype.honorCipherOrder;
-
-/**
- * @interface
- */
-tls.SecureContext = function() {};
-
-/**
- * @type {*}
- */
-tls.SecureContext.prototype.context;
-
-/**
- * @param {tls.TlsOptions} options
- * @param {(function(tls.ClearTextStream): void)=} secureConnectionListener
- * @return {tls.Server}
- */
-tls.createServer = function(options, secureConnectionListener) {};
-
-/**
- * @param {tls.ConnectionOptions} options
- * @param {(function(): void)=} secureConnectionListener
- * @return {tls.ClearTextStream}
- */
-tls.connect = function(options, secureConnectionListener) {};
-
-/**
- * @param {number} port
- * @param {string=} host
- * @param {tls.ConnectionOptions=} options
- * @param {(function(): void)=} secureConnectListener
- * @return {tls.ClearTextStream}
- */
-tls.connect = function(port, host, options, secureConnectListener) {};
-
-/**
- * @param {number} port
- * @param {tls.ConnectionOptions=} options
- * @param {(function(): void)=} secureConnectListener
- * @return {tls.ClearTextStream}
- */
-tls.connect = function(port, options, secureConnectListener) {};
+tls.connect = function(port, host, options, callback) {};

 /**
 * @param {crypto.Credentials=} credentials
@@ -601,46 +83,66 @@ tls.connect = function(port, options, secureConnectListener) {};
 * @param {boolean=} rejectUnauthorized
 * @return {tls.SecurePair}
 */
-tls.createSecurePair = function(credentials, isServer, requestCert, rejectUnauthorized) {};
+tls.createSecurePair;

 /**
- * @param {tls.SecureContextOptions} details
- * @return {tls.SecureContext}
+ * @constructor
+ * @extends events.EventEmitter
 */
-tls.createSecureContext = function(details) {};
+tls.SecurePair = function() {};

-module.exports.Certificate = tls.Certificate;
+/**
+ * @constructor
+ * @extends net.Server
+ */
+tls.Server = function() {};

-module.exports.CipherNameAndProtocol = tls.CipherNameAndProtocol;
+/**
+ * @param {string} hostname
+ * @param {string|Buffer} credentials
+ * @return {void}
+ */
+tls.Server.prototype.addContext = function(hostname, credentials) {};

-module.exports.TLSSocket = tls.TLSSocket;
+/**
+ * @constructor
+ * @extends stream.Duplex
+ */
+tls.CleartextStream = function() {};

-module.exports.TlsOptions = tls.TlsOptions;
+/**
+ * @type {boolean}
+ */
+tls.CleartextStream.prototype.authorized;

-module.exports.ConnectionOptions = tls.ConnectionOptions;
+/**
+ * @type {?string}
+ */
+tls.CleartextStream.prototype.authorizationError;

-module.exports.Server = tls.Server;
+/**
+ * @return {Object.<string,(string|Object.<string,string>)>}
+ */
+tls.CleartextStream.prototype.getPeerCertificate;

-module.exports.ClearTextStream = tls.ClearTextStream;
+/**
+ * @return {{name: string, version: string}}
+ */
+tls.CleartextStream.prototype.getCipher;

-module.exports.SecurePair = tls.SecurePair;
+/**
+ * @return {{port: number, family: string, address: string}}
+ */
+tls.CleartextStream.prototype.address;

-module.exports.SecureContextOptions = tls.SecureContextOptions;
+/**
+ * @type {string}
+ */
+tls.CleartextStream.prototype.remoteAddress;

-module.exports.SecureContext = tls.SecureContext;
+/**
+ * @type {number}
+ */
+tls.CleartextStream.prototype.remotePort;

-module.exports.createServer = tls.createServer;
-
-module.exports.connect = tls.connect;
-
-module.exports.connect = tls.connect;
-
-module.exports.connect = tls.connect;
-
-module.exports.createSecurePair = tls.createSecurePair;
-
-module.exports.createSecureContext = tls.createSecureContext;
-
-module.exports.CLIENT_RENEG_WINDOW = CLIENT_RENEG_WINDOW;
-
-module.exports.CLIENT_RENEG_LIMIT = CLIENT_RENEG_LIMIT;
+module.exports = tls;
--- a/javascript/externs/nodejs/tty.js
+++ b/javascript/externs/nodejs/tty.js
@@ -1,55 +1,47 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "tty"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's tty module. Depends on the net module.
+ * @see http://nodejs.org/api/tty.html
+ * @see https://github.com/joyent/node/blob/master/lib/tty.js
+ */
+
+var net = require('net');
+
+/**
+ * @const
+ */
 var tty = {};

-var net = require("net");
-
 /**
- * @param {number} fd
+ * @param {*} fd
 * @return {boolean}
 */
-tty.isatty = function(fd) {};
+tty.isatty;

 /**
- * @interface
- * @extends {net.Socket}
+ * @param {boolean} mode
+ * @return {void}
+ */
+tty.setRawMode;
+
+/**
+ * @constructor
+ * @extends net.Socket
 */
 tty.ReadStream = function() {};

@@ -62,16 +54,11 @@ tty.ReadStream.prototype.isRaw;
 * @param {boolean} mode
 * @return {void}
 */
-tty.ReadStream.prototype.setRawMode = function(mode) {};
+tty.ReadStream.prototype.setRawMode;

 /**
- * @type {boolean}
- */
-tty.ReadStream.prototype.isTTY;
-
-/**
- * @interface
- * @extends {net.Socket}
+ * @constructor
+ * @extends net.Socket
 */
 tty.WriteStream = function() {};

@@ -85,49 +72,4 @@ tty.WriteStream.prototype.columns;
 */
 tty.WriteStream.prototype.rows;

-/**
- * @type {boolean}
- */
-tty.WriteStream.prototype.isTTY;
-
-module.exports.isatty = tty.isatty;
-
-module.exports.ReadStream = tty.ReadStream;
-
-module.exports.WriteStream = tty.WriteStream;
-
-/**
- * @param {boolean} mode
- * @return {void}
- */
-tty.setRawMode = function(mode) {};
-
-/**
- * @param {string} path
- * @param {Array<string>=} args
- * @return {Array<*>}
- */
-tty.open = function(path, args) {};
-
-/**
- * @param {*} fd
- * @param {number} row
- * @param {number} col
- * @return {*}
- */
-tty.setWindowSize = function(fd, row, col) {};
-
-/**
- * @param {*} fd
- * @return {Array<number>}
- */
-tty.getWindowSize = function(fd) {};
-
-module.exports.setRawMode = tty.setRawMode;
-
-module.exports.open = tty.open;
-
-module.exports.setWindowSize = tty.setWindowSize;
-
-module.exports.getWindowSize = tty.getWindowSize;
-
+module.exports = tty;
--- a/javascript/externs/nodejs/url.js
+++ b/javascript/externs/nodejs/url.js
@@ -1,135 +1,57 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "url"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's url module.
+ * @see http://nodejs.org/api/url.html
+ * @see https://github.com/joyent/node/blob/master/lib/url.js
+ */
+
+/**
+ * @const
+ */
 var url = {};

 /**
- * @interface
+ * @typedef {{href: ?string, protocol: ?string, host: ?string, auth: ?string, hostname: ?string, port: ?string, pathname: ?string, search: ?string, path: ?string, query: ?string, hash: ?string}}
 */
-url.Url = function() {};
-
-/**
- * @type {string}
- */
-url.Url.prototype.href;
-
-/**
- * @type {string}
- */
-url.Url.prototype.protocol;
-
-/**
- * @type {string}
- */
-url.Url.prototype.auth;
-
-/**
- * @type {string}
- */
-url.Url.prototype.hostname;
-
-/**
- * @type {string}
- */
-url.Url.prototype.port;
-
-/**
- * @type {string}
- */
-url.Url.prototype.host;
-
-/**
- * @type {string}
- */
-url.Url.prototype.pathname;
-
-/**
- * @type {string}
- */
-url.Url.prototype.search;
-
-/**
- * @type {*}
- */
-url.Url.prototype.query;
-
-/**
- * @type {boolean}
- */
-url.Url.prototype.slashes;
-
-/**
- * @type {string}
- */
-url.Url.prototype.hash;
-
-/**
- * @type {string}
- */
-url.Url.prototype.path;
+var URL;

 /**
 * @param {string} urlStr
 * @param {boolean=} parseQueryString
 * @param {boolean=} slashesDenoteHost
- * @return {url.Url}
+ * @return {URL}
+ * @nosideeffects
 */
-url.parse = function(urlStr, parseQueryString, slashesDenoteHost) {};
+url.parse;

 /**
- * @param {url.Url} url
+ * @param {URL} urlObj
 * @return {string}
+ * @nosideeffects
 */
-url.format = function(url) {};
+url.format;

 /**
 * @param {string} from
 * @param {string} to
 * @return {string}
+ * @nosideeffects
 */
-url.resolve = function(from, to) {};
-
-module.exports.Url = url.Url;
-
-module.exports.parse = url.parse;
-
-module.exports.format = url.format;
-
-module.exports.resolve = url.resolve;
+url.resolve;

+module.exports = url;
--- a/javascript/externs/nodejs/util.js
+++ b/javascript/externs/nodejs/util.js
@@ -1,292 +1,112 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "util"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's util module. Depends on the stream module.
+ * @see http://nodejs.org/api/util.html
+ * @see https://github.com/joyent/node/blob/master/lib/util.js
+ */
+
+/**
+ * @const
+ */
 var util = {};

 /**
- * @interface
- */
-util.InspectOptions = function() {};
-
-/**
- * @type {boolean}
- */
-util.InspectOptions.prototype.showHidden;
-
-/**
- * @type {number}
- */
-util.InspectOptions.prototype.depth;
-
-/**
- * @type {boolean}
- */
-util.InspectOptions.prototype.colors;
-
-/**
- * @type {boolean}
- */
-util.InspectOptions.prototype.customInspect;
-
-/**
- * @param {*} format
- * @param {...*} param
+ * @param {string} format
+ * @param {...*} var_args
 * @return {string}
+ * @nosideeffects
 */
-util.format = function(format, param) {};
+util.format;

 /**
 * @param {string} string
 * @return {void}
 */
-util.debug = function(string) {};
+util.debug;

 /**
- * @param {...*} param
+ * @param {...*} var_args
 * @return {void}
 */
-util.error = function(param) {};
+util.error;

 /**
- * @param {...*} param
+ * @param {...*} var_args
 * @return {void}
 */
-util.puts = function(param) {};
+util.puts;

 /**
- * @param {...*} param
+ * @param {...*} var_args
 * @return {void}
 */
-util.print = function(param) {};
+util.print;

 /**
 * @param {string} string
 * @return {void}
 */
-util.log = function(string) {};
+util.log;

 /**
 * @param {*} object
- * @param {boolean=} showHidden
- * @param {number=} depth
- * @param {boolean=} color
+ * @param {{showHidden: (boolean|undefined),
+ *          depth: (number|null|undefined),
+ *          colors: (boolean|undefined),
+ *          customInspect: (boolean|undefined)}=} options
 * @return {string}
+ * @nosideeffects
 */
-util.inspect = function(object, showHidden, depth, color) {};
-
-/**
- * @param {*} object
- * @param {util.InspectOptions} options
- * @return {string}
- */
-util.inspect = function(object, options) {};
+util.inspect;

 /**
 * @param {*} object
 * @return {boolean}
+ * @nosideeffects
 */
-util.isArray = function(object) {};
+util.isArray;

 /**
 * @param {*} object
 * @return {boolean}
+ * @nosideeffects
 */
-util.isRegExp = function(object) {};
+util.isRegExp;

 /**
 * @param {*} object
 * @return {boolean}
+ * @nosideeffects
 */
-util.isDate = function(object) {};
+util.isDate;

 /**
 * @param {*} object
 * @return {boolean}
+ * @nosideeffects
 */
-util.isError = function(object) {};
+util.isError;

 /**
- * @param {*} constructor
- * @param {*} superConstructor
+ * @param {Function} constructor
+ * @param {Function} superConstructor
 * @return {void}
 */
-util.inherits = function(constructor, superConstructor) {};
-
-/**
- * @param {string} key
- * @return {(function(string, ...*): void)}
- */
-util.debuglog = function(key) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isBoolean = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isBuffer = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isFunction = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isNull = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isNullOrUndefined = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isNumber = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isObject = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isPrimitive = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isString = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isSymbol = function(object) {};
-
-/**
- * @param {*} object
- * @return {boolean}
- */
-util.isUndefined = function(object) {};
-
-/**
- * @param {Function} fn
- * @param {string} message
- * @return {Function}
- */
-util.deprecate = function(fn, message) {};
-
-module.exports.InspectOptions = util.InspectOptions;
-
-module.exports.format = util.format;
-
-module.exports.debug = util.debug;
-
-module.exports.error = util.error;
-
-module.exports.puts = util.puts;
-
-module.exports.print = util.print;
-
-module.exports.log = util.log;
-
-module.exports.inspect = util.inspect;
-
-module.exports.inspect = util.inspect;
-
-module.exports.isArray = util.isArray;
-
-module.exports.isRegExp = util.isRegExp;
-
-module.exports.isDate = util.isDate;
-
-module.exports.isError = util.isError;
-
-module.exports.inherits = util.inherits;
-
-module.exports.debuglog = util.debuglog;
-
-module.exports.isBoolean = util.isBoolean;
-
-module.exports.isBuffer = util.isBuffer;
-
-module.exports.isFunction = util.isFunction;
-
-module.exports.isNull = util.isNull;
-
-module.exports.isNullOrUndefined = util.isNullOrUndefined;
-
-module.exports.isNumber = util.isNumber;
-
-module.exports.isObject = util.isObject;
-
-module.exports.isPrimitive = util.isPrimitive;
-
-module.exports.isString = util.isString;
-
-module.exports.isSymbol = util.isSymbol;
-
-module.exports.isUndefined = util.isUndefined;
-
-module.exports.deprecate = util.deprecate;
-
-/**
- * @param {Object} destination
- * @param {Object} source
- * @return {Object}
- */
-util._extend = function(destination, source) {};
-
-module.exports._extend = util._extend;
+util.inherits;

+module.exports = util;
--- a/javascript/externs/nodejs/vm.js
+++ b/javascript/externs/nodejs/vm.js
@@ -1,214 +1,86 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "vm"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's vm module.
+ * @see http://nodejs.org/api/vm.html
+ * @see https://github.com/joyent/node/blob/master/lib/vm.js
+ */
+
+/**
+ * @const
+ */
 var vm = {};

 /**
- * @interface
- */
-vm.Context = function() {};
-
-/**
- * @interface
- */
-vm.ScriptOptions = function() {};
-
-/**
- * @type {string}
- */
-vm.ScriptOptions.prototype.filename;
-
-/**
- * @type {number}
- */
-vm.ScriptOptions.prototype.lineOffset;
-
-/**
- * @type {number}
- */
-vm.ScriptOptions.prototype.columnOffset;
-
-/**
- * @type {boolean}
- */
-vm.ScriptOptions.prototype.displayErrors;
-
-/**
- * @type {number}
- */
-vm.ScriptOptions.prototype.timeout;
-
-/**
- * @type {Buffer}
- */
-vm.ScriptOptions.prototype.cachedData;
-
-/**
- * @type {boolean}
- */
-vm.ScriptOptions.prototype.produceCachedData;
-
-/**
- * @interface
- */
-vm.RunningScriptOptions = function() {};
-
-/**
- * @type {string}
- */
-vm.RunningScriptOptions.prototype.filename;
-
-/**
- * @type {number}
- */
-vm.RunningScriptOptions.prototype.lineOffset;
-
-/**
- * @type {number}
- */
-vm.RunningScriptOptions.prototype.columnOffset;
-
-/**
- * @type {boolean}
- */
-vm.RunningScriptOptions.prototype.displayErrors;
-
-/**
- * @type {number}
- */
-vm.RunningScriptOptions.prototype.timeout;
-
-/**
- * @param {string} code
- * @param {vm.ScriptOptions=} options
- * @return {vm.Script}
 * @constructor
 */
-vm.Script = function(code, options) {};
+vm.Context = function() {}; // Does not really exist

 /**
- * @param {vm.Context} contextifiedSandbox
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
+ * @param {string} code
+ * @param {string=} filename
 */
-vm.Script.prototype.runInContext = function(contextifiedSandbox, options) {};
+vm.runInThisContext;

 /**
- * @param {vm.Context=} sandbox
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
+ * @param {string} code
+ * @param {Object.<string,*>=} sandbox
+ * @param {string=} filename
+ * @return {void}
 */
-vm.Script.prototype.runInNewContext = function(sandbox, options) {};
+vm.runInNewContext;

 /**
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
+ * @param {string} code
+ * @param {vm.Context} context
+ * @param {string=} filename
+ * @return {void}
 */
-vm.Script.prototype.runInThisContext = function(options) {};
+vm.runInContext;

 /**
- * @param {vm.Context=} sandbox
+ * @param {Object.<string,*>=} initSandbox
 * @return {vm.Context}
+ * @nosideeffects
 */
-vm.createContext = function(sandbox) {};
+vm.createContext;

 /**
- * @param {vm.Context} sandbox
- * @return {boolean}
+ * @constructor
 */
-vm.isContext = function(sandbox) {};
-
-/**
- * @param {string} code
- * @param {vm.Context} contextifiedSandbox
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
- */
-vm.runInContext = function(code, contextifiedSandbox, options) {};
-
-/**
- * @param {string} code
- * @return {*}
- */
-vm.runInDebugContext = function(code) {};
-
-/**
- * @param {string} code
- * @param {vm.Context=} sandbox
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
- */
-vm.runInNewContext = function(code, sandbox, options) {};
-
-/**
- * @param {string} code
- * @param {vm.RunningScriptOptions=} options
- * @return {*}
- */
-vm.runInThisContext = function(code, options) {};
-
-module.exports.Context = vm.Context;
-
-module.exports.ScriptOptions = vm.ScriptOptions;
-
-module.exports.RunningScriptOptions = vm.RunningScriptOptions;
-
-module.exports.Script = vm.Script;
-
-module.exports.createContext = vm.createContext;
-
-module.exports.isContext = vm.isContext;
-
-module.exports.runInContext = vm.runInContext;
-
-module.exports.runInDebugContext = vm.runInDebugContext;
-
-module.exports.runInNewContext = vm.runInNewContext;
-
-module.exports.runInThisContext = vm.runInThisContext;
+vm.Script = function() {};

 /**
 * @param {string} code
 * @param {string=} filename
 * @return {vm.Script}
+ * @nosideeffects
 */
-vm.createScript = function(code, filename) {};
+vm.createScript;

-module.exports.createScript = vm.createScript;
+/**
+ * @return {void}
+ */
+vm.Script.prototype.runInThisContext;

+/**
+ * @param {Object.<string,*>=} sandbox
+ * @return {void}
+ */
+vm.Script.prototype.runInNewContext;
+
+module.exports = vm;
--- a/javascript/externs/nodejs/zlib.js
+++ b/javascript/externs/nodejs/zlib.js
@@ -1,533 +1,386 @@
-// Automatically generated from TypeScript type definitions provided by
-// DefinitelyTyped (https://github.com/DefinitelyTyped/DefinitelyTyped),
-// which is licensed under the MIT license; see file DefinitelyTyped-LICENSE
-// in parent directory.
-// Type definitions for Node.js 10.5.x
-// Project: http://nodejs.org/
-// Definitions by: Microsoft TypeScript <http://typescriptlang.org>
-//                 DefinitelyTyped <https://github.com/DefinitelyTyped/DefinitelyTyped>
-//                 Parambir Singh <https://github.com/parambirs>
-//                 Christian Vaagland Tellnes <https://github.com/tellnes>
-//                 Wilco Bakker <https://github.com/WilcoBakker>
-//                 Nicolas Voigt <https://github.com/octo-sniffle>
-//                 Chigozirim C. <https://github.com/smac89>
-//                 Flarna <https://github.com/Flarna>
-//                 Mariusz Wiktorczyk <https://github.com/mwiktorczyk>
-//                 wwwy3y3 <https://github.com/wwwy3y3>
-//                 Deividas Bakanas <https://github.com/DeividasBakanas>
-//                 Kelvin Jin <https://github.com/kjin>
-//                 Alvis HT Tang <https://github.com/alvis>
-//                 Sebastian Silbermann <https://github.com/eps1lon>
-//                 Hannes Magnusson <https://github.com/Hannes-Magnusson-CK>
-//                 Alberto Schiabel <https://github.com/jkomyno>
-//                 Klaus Meinhardt <https://github.com/ajafff>
-//                 Huw <https://github.com/hoo29>
-//                 Nicolas Even <https://github.com/n-e>
-//                 Bruno Scheufler <https://github.com/brunoscheufler>
-//                 Mohsen Azimi <https://github.com/mohsen1>
-//                 Hoàng Văn Khải <https://github.com/KSXGitHub>
-//                 Alexander T. <https://github.com/a-tarasyuk>
-//                 Lishude <https://github.com/islishude>
-//                 Andrew Makarov <https://github.com/r3nya>
-//                 Zane Hannan AU <https://github.com/ZaneHannanAU>
-// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
-/**
- * @externs
- * @fileoverview Definitions for module "zlib"
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
 */

+/**
+ * @fileoverview Definitions for node's zlib module. Depends on the events and buffer modules.
+ * @see http://nodejs.org/api/zlib.html
+ * @see https://github.com/joyent/node/blob/master/lib/zlib.js
+ */
+
+var stream = require('stream');
+
+/**
+ * @const
+ */
 var zlib = {};

 /**
- * @interface
+ * @typedef {{chunkSize: ?number, windowBits: ?number, level: ?number, memLevel: ?number, strategy: ?number, dictionary: ?Object}}
 */
-zlib.ZlibOptions = function() {};
+zlib.Options;
+
+

 /**
- * @type {number}
+ * @constructor
+ * @extends stream.Transform
 */
-zlib.ZlibOptions.prototype.chunkSize;
+zlib.Zlib = function() {};

 /**
- * @type {number}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.ZlibOptions.prototype.windowBits;
+zlib.Gzip = function(options) {};

 /**
- * @type {number}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.ZlibOptions.prototype.level;
+zlib.Gunzip = function(options) {};

 /**
- * @type {number}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.ZlibOptions.prototype.memLevel;
+zlib.Deflate = function(options) {};

 /**
- * @type {number}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.ZlibOptions.prototype.strategy;
+zlib.Inflate = function(options) {};

 /**
- * @type {*}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.ZlibOptions.prototype.dictionary;
+zlib.DeflateRaw = function(options) {};

 /**
- * @interface
- * @extends {internal.Transform}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.Gzip = function() {};
+zlib.InflateRaw = function(options) {};

 /**
- * @interface
- * @extends {internal.Transform}
+ * @param {zlib.Options} options
+ * @constructor
+ * @extends zlib.Zlib
 */
-zlib.Gunzip = function() {};
+zlib.Unzip = function(options) {};
+
+

 /**
- * @interface
- * @extends {internal.Transform}
- */
-zlib.Deflate = function() {};
-
-/**
- * @interface
- * @extends {internal.Transform}
- */
-zlib.Inflate = function() {};
-
-/**
- * @interface
- * @extends {internal.Transform}
- */
-zlib.DeflateRaw = function() {};
-
-/**
- * @interface
- * @extends {internal.Transform}
- */
-zlib.InflateRaw = function() {};
-
-/**
- * @interface
- * @extends {internal.Transform}
- */
-zlib.Unzip = function() {};
-
-/**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.Gzip}
 */
-zlib.createGzip = function(options) {};
+zlib.createGzip;

 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.Gunzip}
 */
-zlib.createGunzip = function(options) {};
+zlib.createGunzip;

 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.Deflate}
 */
-zlib.createDeflate = function(options) {};
-
+zlib.createDeflate;
 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.Inflate}
 */
-zlib.createInflate = function(options) {};
+zlib.createInflate;

 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.DeflateRaw}
 */
-zlib.createDeflateRaw = function(options) {};
+zlib.createDeflateRaw;

 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.InflateRaw}
 */
-zlib.createInflateRaw = function(options) {};
+zlib.createInflateRaw;

 /**
- * @param {zlib.ZlibOptions=} options
+ * @param {zlib.Options} options
 * @return {zlib.Unzip}
 */
-zlib.createUnzip = function(options) {};
+zlib.createUnzip;
+
+

 /**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.deflate = function(buf, callback) {};
+zlib.deflate;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.deflateSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.deflateRaw = function(buf, callback) {};
+zlib.deflateRaw;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.deflateRawSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.gzip = function(buf, callback) {};
+zlib.gzip;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.gzipSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.gunzip = function(buf, callback) {};
+zlib.gunzip;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.gunzipSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.inflate = function(buf, callback) {};
+zlib.inflate;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.inflateSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.inflateRaw = function(buf, callback) {};
+zlib.inflateRaw;

 /**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.inflateRawSync = function(buf, options) {};
-
-/**
- * @param {Buffer} buf
- * @param {(function(Error, *): void)} callback
+ * @param {string|Buffer} buf
+ * @param {function(...)} callback
 * @return {void}
 */
-zlib.unzip = function(buf, callback) {};
+zlib.unzip;
+

-/**
- * @param {Buffer} buf
- * @param {zlib.ZlibOptions=} options
- * @return {*}
- */
-zlib.unzipSync = function(buf, options) {};

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_NO_FLUSH;
+zlib.Z_NO_FLUSH = 0;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_PARTIAL_FLUSH;
+zlib.Z_PARTIAL_FLUSH = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_SYNC_FLUSH;
+zlib.Z_SYNC_FLUSH = 2;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_FULL_FLUSH;
+zlib.Z_FULL_FLUSH = 3;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_FINISH;
+zlib.Z_FINISH = 4;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_BLOCK;
+zlib.Z_BLOCK = 5;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_TREES;
+zlib.Z_TREES = 6;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_OK;
+zlib.Z_OK = 0;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_STREAM_END;
+zlib.Z_STREAM_END = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_NEED_DICT;
+zlib.Z_NEED_DICT = 2;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_ERRNO;
+zlib.Z_ERRNO = -1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_STREAM_ERROR;
+zlib.Z_STREAM_ERROR = -2;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_DATA_ERROR;
+zlib.Z_DATA_ERROR = -3;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_MEM_ERROR;
+zlib.Z_MEM_ERROR = -4;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_BUF_ERROR;
+zlib.Z_BUF_ERROR = -5;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_VERSION_ERROR;
+zlib.Z_VERSION_ERROR = -6;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_NO_COMPRESSION;
+zlib.Z_NO_COMPRESSION = 0;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_BEST_SPEED;
+zlib.Z_BEST_SPEED = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_BEST_COMPRESSION;
+zlib.Z_BEST_COMPRESSION = 9;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_DEFAULT_COMPRESSION;
+zlib.Z_DEFAULT_COMPRESSION = -1;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_FILTERED;
+zlib.Z_FILTERED = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_HUFFMAN_ONLY;
+zlib.Z_HUFFMAN_ONLY = 2;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_RLE;
+zlib.Z_RLE = 3;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_FIXED;
+zlib.Z_FIXED = 4;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_DEFAULT_STRATEGY;
+zlib.Z_DEFAULT_STRATEGY = 0;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_BINARY;
+zlib.Z_BINARY = 0;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_TEXT;
+zlib.Z_TEXT = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_ASCII;
+zlib.Z_ASCII = 1;

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_UNKNOWN;
+zlib.Z_UNKNOWN = 2;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_DEFLATED;
+zlib.Z_DEFLATED = 8;
+
+

 /**
 * @type {number}
+ * @const
 */
-zlib.Z_NULL;
-
-module.exports.ZlibOptions = zlib.ZlibOptions;
-
-module.exports.Gzip = zlib.Gzip;
-
-module.exports.Gunzip = zlib.Gunzip;
-
-module.exports.Deflate = zlib.Deflate;
-
-module.exports.Inflate = zlib.Inflate;
-
-module.exports.DeflateRaw = zlib.DeflateRaw;
-
-module.exports.InflateRaw = zlib.InflateRaw;
-
-module.exports.Unzip = zlib.Unzip;
-
-module.exports.createGzip = zlib.createGzip;
-
-module.exports.createGunzip = zlib.createGunzip;
-
-module.exports.createDeflate = zlib.createDeflate;
-
-module.exports.createInflate = zlib.createInflate;
-
-module.exports.createDeflateRaw = zlib.createDeflateRaw;
-
-module.exports.createInflateRaw = zlib.createInflateRaw;
-
-module.exports.createUnzip = zlib.createUnzip;
-
-module.exports.deflate = zlib.deflate;
-
-module.exports.deflateSync = zlib.deflateSync;
-
-module.exports.deflateRaw = zlib.deflateRaw;
-
-module.exports.deflateRawSync = zlib.deflateRawSync;
-
-module.exports.gzip = zlib.gzip;
-
-module.exports.gzipSync = zlib.gzipSync;
-
-module.exports.gunzip = zlib.gunzip;
-
-module.exports.gunzipSync = zlib.gunzipSync;
-
-module.exports.inflate = zlib.inflate;
-
-module.exports.inflateSync = zlib.inflateSync;
-
-module.exports.inflateRaw = zlib.inflateRaw;
-
-module.exports.inflateRawSync = zlib.inflateRawSync;
-
-module.exports.unzip = zlib.unzip;
-
-module.exports.unzipSync = zlib.unzipSync;
-
-module.exports.Z_NO_FLUSH = zlib.Z_NO_FLUSH;
-
-module.exports.Z_PARTIAL_FLUSH = zlib.Z_PARTIAL_FLUSH;
-
-module.exports.Z_SYNC_FLUSH = zlib.Z_SYNC_FLUSH;
-
-module.exports.Z_FULL_FLUSH = zlib.Z_FULL_FLUSH;
-
-module.exports.Z_FINISH = zlib.Z_FINISH;
-
-module.exports.Z_BLOCK = zlib.Z_BLOCK;
-
-module.exports.Z_TREES = zlib.Z_TREES;
-
-module.exports.Z_OK = zlib.Z_OK;
-
-module.exports.Z_STREAM_END = zlib.Z_STREAM_END;
-
-module.exports.Z_NEED_DICT = zlib.Z_NEED_DICT;
-
-module.exports.Z_ERRNO = zlib.Z_ERRNO;
-
-module.exports.Z_STREAM_ERROR = zlib.Z_STREAM_ERROR;
-
-module.exports.Z_DATA_ERROR = zlib.Z_DATA_ERROR;
-
-module.exports.Z_MEM_ERROR = zlib.Z_MEM_ERROR;
-
-module.exports.Z_BUF_ERROR = zlib.Z_BUF_ERROR;
-
-module.exports.Z_VERSION_ERROR = zlib.Z_VERSION_ERROR;
-
-module.exports.Z_NO_COMPRESSION = zlib.Z_NO_COMPRESSION;
-
-module.exports.Z_BEST_SPEED = zlib.Z_BEST_SPEED;
-
-module.exports.Z_BEST_COMPRESSION = zlib.Z_BEST_COMPRESSION;
-
-module.exports.Z_DEFAULT_COMPRESSION = zlib.Z_DEFAULT_COMPRESSION;
-
-module.exports.Z_FILTERED = zlib.Z_FILTERED;
-
-module.exports.Z_HUFFMAN_ONLY = zlib.Z_HUFFMAN_ONLY;
-
-module.exports.Z_RLE = zlib.Z_RLE;
-
-module.exports.Z_FIXED = zlib.Z_FIXED;
-
-module.exports.Z_DEFAULT_STRATEGY = zlib.Z_DEFAULT_STRATEGY;
-
-module.exports.Z_BINARY = zlib.Z_BINARY;
-
-module.exports.Z_TEXT = zlib.Z_TEXT;
-
-module.exports.Z_ASCII = zlib.Z_ASCII;
-
-module.exports.Z_UNKNOWN = zlib.Z_UNKNOWN;
-
-module.exports.Z_DEFLATED = zlib.Z_DEFLATED;
-
-module.exports.Z_NULL = zlib.Z_NULL;
+zlib.Z_NULL = 0;

+module.exports = zlib;
--- a/javascript/externs/vm/v8.js
+++ b/javascript/externs/vm/v8.js
@@ -28,6 +28,15 @@
 function CallSite() {}


+/**
+ * Runs the garbage collector, provided that you start V8 with --expose-gc or
+ * Chrome with --js-flags="--expose-gc".
+ * See https://v8.dev/docs/memory-leaks
+ * @type {undefined|function()}
+ */
+CallSite.prototype.gc;
+
+
 /**
 * Returns the value of this.
 * @return {Object|undefined}
--- a/javascript/externs/web/chrome.js
+++ b/javascript/externs/web/chrome.js
@@ -65,248 +65,286 @@ Port.prototype.disconnect = function() {};


 /**
- * @see https://developer.chrome.com/extensions/events.html
- * @constructor
- * TODO(tbreisacher): Update *Listener methods to take {function()}
- * instead of {!Function}. See discussion at go/ChromeEvent-TODO
+ * Base event type without listener methods.
+ *
+ * This interface exists for event interfaces whose addListeners() method takes
+ * more than one parameter. Those interfaces must inherit from this one, so they
+ * can supply their own custom listener method declarations.
+ *
+ * Event interfaces whose addListeners() method takes just one parameter should
+ * inherit from ChromeBaseEvent instead. It extends this interface.
+ *
+ * @see https://developer.chrome.com/extensions/events
+ * @interface
+ */
+function ChromeBaseEventNoListeners() {}
+
+
+/**
+ * @param {!Array<!Rule>} rules
+ * @param {function(!Array<!Rule>): void=} callback
+ * @see https://developer.chrome.com/extensions/events#method-Event-addRules
+ */
+ChromeBaseEventNoListeners.prototype.addRules = function(rules, callback) {};
+
+
+/**
+ * Returns currently registered rules.
+ *
+ * NOTE: The API allows the first argument to be omitted.
+ *     That cannot be correctly represented here, so we end up incorrectly
+ *     allowing 2 callback arguments.
+ * @param {!Array<string>|function(!Array<!Rule>): void} ruleIdentifiersOrCb
+ * @param {function(!Array<!Rule>): void=} callback
+ * @see https://developer.chrome.com/extensions/events#method-Event-getRules
+ */
+ChromeBaseEventNoListeners.prototype.getRules =
+    function(ruleIdentifiersOrCb, callback) {};
+
+
+/**
+ * Removes currently registered rules.
+ *
+ * NOTE: The API allows the either or both arguments to be omitted.
+ *     That cannot be correctly represented here, so we end up incorrectly
+ *     allowing 2 callback arguments.
+ * @param {(!Array<string>|function(): void)=} ruleIdentifiersOrCb
+ * @param {function(): void=} callback
+ * @see https://developer.chrome.com/extensions/events#method-Event-removeRules
+ */
+ChromeBaseEventNoListeners.prototype.removeRules =
+    function(ruleIdentifiersOrCb, callback) {};
+
+
+/**
+ * @see https://developer.chrome.com/extensions/events#type-Rule
+ * @record
+ */
+function Rule() {}
+
+
+/** @type {string|undefined} */
+Rule.prototype.id;
+
+
+/** @type {!Array<string>|undefined} */
+Rule.prototype.tags;
+
+
+/** @type {!Array<*>} */
+Rule.prototype.conditions;
+
+
+/** @type {!Array<*>} */
+Rule.prototype.actions;
+
+
+/** @type {number|undefined} */
+Rule.prototype.priority;
+
+
+/**
+ * @see https://developer.chrome.com/extensions/events#type-UrlFilter
+ * @record
+ */
+function UrlFilter() {}
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.hostContains;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.hostEquals;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.hostPrefix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.hostSuffix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.pathContains;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.pathEquals;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.pathPrefix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.pathSuffix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.queryContains;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.queryEquals;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.queryPrefix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.querySuffix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.urlContains;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.urlEquals;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.urlMatches;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.originAndPathMatches;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.urlPrefix;
+
+
+/** @type {string|undefined} */
+UrlFilter.prototype.urlSuffix;
+
+
+/** @type {!Array<string>|undefined} */
+UrlFilter.prototype.schemes;
+
+
+/** @type {!Array<(number|!Array<number>)>|undefined} */
+UrlFilter.prototype.ports;
+
+
+/**
+ * Base event type from which all others inherit.
+ *
+ * LISTENER must be a function type that returns void.
+ *
+ * @see https://developer.chrome.com/extensions/events
+ * @interface
+ * @extends {ChromeBaseEventNoListeners}
+ * @template LISTENER
+ */
+function ChromeBaseEvent() {}
+
+
+/**
+ * @param {LISTENER} callback
+ * @return {undefined}
+ * @see https://developer.chrome.com/extensions/events#method-Event-addListener
+ */
+ChromeBaseEvent.prototype.addListener = function(callback) {};
+
+
+/**
+ * @param {LISTENER} callback
+ * @return {undefined}
+ * @see https://developer.chrome.com/extensions/events#method-Event-removeListener
+ */
+ChromeBaseEvent.prototype.removeListener = function(callback) {};
+
+
+/**
+ * @param {LISTENER} callback
+ * @return {boolean}
+ * @see https://developer.chrome.com/extensions/events#method-Event-hasListener
+ */
+ChromeBaseEvent.prototype.hasListener = function(callback) {};
+
+
+/**
+ * @return {boolean}
+ * @see https://developer.chrome.com/extensions/events#method-Event-hasListeners
+ */
+ChromeBaseEvent.prototype.hasListeners = function() {};
+
+
+/**
+ * Event whose listeners take unspecified parameters.
+ *
+ * TODO(bradfordcsmith): Definitions using this type are failing to provide
+ *     information about the parameters that will actually be supplied to the
+ *     listener and should be updated to use a more specific event type.
+ * @see https://developer.chrome.com/extensions/events
+ * @interface
+ * @extends {ChromeBaseEvent<!Function>}
 */
 function ChromeEvent() {}


 /**
- * @param {!Function} callback
- * @return {undefined}
+ * Event whose listeners take no parameters.
+ *
+ * @see https://developer.chrome.com/extensions/events
+ * @interface
+ * @extends {ChromeBaseEvent<function()>}
 */
-ChromeEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {!Function} callback
- * @return {undefined}
- */
-ChromeEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {!Function} callback
- * @return {boolean}
- */
-ChromeEvent.prototype.hasListener = function(callback) {};
-
-
-/** @return {boolean} */
-ChromeEvent.prototype.hasListeners = function() {};
-
-// TODO(tbreisacher): Add the addRules, getRules, and removeRules methods?
-
+function ChromeVoidEvent() {}


 /**
 * Event whose listeners take a string parameter.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(string)>}
 */
 function ChromeStringEvent() {}


-/**
- * @param {function(string): void} callback
- * @return {undefined}
- */
-ChromeStringEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(string): void} callback
- * @return {undefined}
- */
-ChromeStringEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(string): void} callback
- * @return {boolean}
- */
-ChromeStringEvent.prototype.hasListener = function(callback) {};
-
-
-/** @return {boolean} */
-ChromeStringEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * Event whose listeners take a boolean parameter.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(boolean)>}
 */
-
 function ChromeBooleanEvent() {}


-/**
- * @param {function(boolean): void} callback
- * @return {undefined}
- */
-ChromeBooleanEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(boolean): void} callback
- * @return {undefined}
- */
-ChromeBooleanEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(boolean): void} callback
- * @return {boolean}
- */
-ChromeBooleanEvent.prototype.hasListener = function(callback) {};
-
-
-/**
- * @return {boolean}
- */
-ChromeBooleanEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * Event whose listeners take a number parameter.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(number)>}
 */
-
 function ChromeNumberEvent() {}


-/**
- * @param {function(number): void} callback
- * @return {undefined}
- */
-ChromeNumberEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(number): void} callback
- * @return {undefined}
- */
-ChromeNumberEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(number): void} callback
- * @return {boolean}
- */
-ChromeNumberEvent.prototype.hasListener = function(callback) {};
-
-
-/**
- * @return {boolean}
- */
-ChromeNumberEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * Event whose listeners take an Object parameter.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(!Object)>}
 */
 function ChromeObjectEvent() {}


-/**
- * @param {function(!Object): void} callback Callback.
- * @return {undefined}
- */
-ChromeObjectEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(!Object): void} callback Callback.
- * @return {undefined}
- */
-ChromeObjectEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(!Object): void} callback Callback.
- * @return {boolean}
- */
-ChromeObjectEvent.prototype.hasListener = function(callback) {};
-
-
-/**
- * @return {boolean}
- */
-ChromeObjectEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * Event whose listeners take a string array parameter.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(!Array<string>)>}
 */
 function ChromeStringArrayEvent() {}


-/**
- * @param {function(!Array<string>): void} callback
- * @return {undefined}
- */
-ChromeStringArrayEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(!Array<string>): void} callback
- * @return {undefined}
- */
-ChromeStringArrayEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(!Array<string>): void} callback
- * @return {boolean}
- */
-ChromeStringArrayEvent.prototype.hasListener = function(callback) {};
-
-
-/** @return {boolean} */
-ChromeStringArrayEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * Event whose listeners take two strings as parameters.
- * @constructor
+ * @interface
+ * @extends {ChromeBaseEvent<function(string, string)>}
 */
 function ChromeStringStringEvent() {}


-/**
- * @param {function(string, string): void} callback
- * @return {undefined}
- */
-ChromeStringStringEvent.prototype.addListener = function(callback) {};
-
-
-/**
- * @param {function(string, string): void} callback
- * @return {undefined}
- */
-ChromeStringStringEvent.prototype.removeListener = function(callback) {};
-
-
-/**
- * @param {function(string, string): void} callback
- * @return {boolean}
- */
-ChromeStringStringEvent.prototype.hasListener = function(callback) {};
-
-
-/** @return {boolean} */
-ChromeStringStringEvent.prototype.hasListeners = function() {};
-
-
-
 /**
 * @see http://developer.chrome.com/extensions/runtime.html#type-MessageSender
 * @constructor
@@ -330,10 +368,18 @@ MessageSender.prototype.id;
 MessageSender.prototype.url;


+/** @type {string|undefined} */
+MessageSender.prototype.nativeApplication;
+
+
 /** @type {string|undefined} */
 MessageSender.prototype.tlsChannelId;


+/** @type {string|undefined} */
+MessageSender.prototype.origin;
+
+
 /**
 * @enum {string}
 * @see https://developer.chrome.com/extensions/tabs#type-MutedInfoReason
@@ -424,6 +470,10 @@ Tab.prototype.mutedInfo;
 Tab.prototype.url;


+/** @type {string|undefined} */
+Tab.prototype.pendingUrl;
+
+
 // TODO: Make this field optional once dependent projects have been updated.
 /** @type {string} */
 Tab.prototype.title;
@@ -503,12 +553,8 @@ chrome.webstore.onDownloadProgress;
 chrome.runtime = {};


-/** @type {!Object|undefined} */
-chrome.runtime.lastError = {};
-
-
-/** @type {string|undefined} */
-chrome.runtime.lastError.message;
+/** @type {{message:(string|undefined)}|undefined} */
+chrome.runtime.lastError;


 /**
@@ -618,49 +664,6 @@ ChromeLoadTimes.prototype.wasAlternateProtocolAvailable;
 ChromeLoadTimes.prototype.connectionInfo;


-/**
- * Returns an object containing timing information.
- * @return {!ChromeCsiInfo}
- */
-chrome.csi = function() {};
-
-
-
-/**
- * The data object given by chrome.csi().
- * @constructor
- */
-function ChromeCsiInfo() {}
-
-
-/**
- * Same as chrome.loadTimes().requestTime, if defined.
- * Otherwise, gives the same value as chrome.loadTimes().startLoadTime.
- * In milliseconds, truncated.
- * @type {number}
- */
-ChromeCsiInfo.prototype.startE;
-
-
-/**
- * Same as chrome.loadTimes().finishDocumentLoadTime but in milliseconds and
- * truncated.
- * @type {number}
- */
-ChromeCsiInfo.prototype.onloadT;
-
-
-/**
- * The time since startE in milliseconds.
- * @type {number}
- */
-ChromeCsiInfo.prototype.pageT;
-
-
-/** @type {number} */
-ChromeCsiInfo.prototype.tran;
-
-
 /**
 * @param {string|!ArrayBuffer|!Object} message
 * @see https://developers.google.com/native-client/devguide/tutorial
--- a/javascript/externs/web/deprecated.js
+++ b/javascript/externs/web/deprecated.js
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2008 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview JavaScript Built-Ins that are not part of any specifications
+ * but are still needed in some project's build.
+ * @externs
+ */
+var opera = {};
+
+opera.postError;
+
+/** @nosideeffects */
+opera.version = function() {};
+
+/** @constructor */
+function XSLTProcessor() {}
+
+/**
+ * @param {Node} styleSheet
+ * @return {undefined}
+ * @deprecated
+ */
+XSLTProcessor.prototype.importStylesheet = function(styleSheet) {};
+
+/**
+ * @param {Node} source
+ * @return {Document}
+ * @deprecated
+ */
+XSLTProcessor.prototype.transformToDocument = function(source) {};
+
+// The "methods" object is a place to hang arbitrary external
+// properties. It is a throwback to pre-typed days, and should
+// not be used for any new definitions; it exists only to bridge
+// the gap between the old way and the new way.
+var methods = {};
--- a/javascript/externs/web/es6_proxy.js
+++ b/javascript/externs/web/es6_proxy.js
@@ -0,0 +1,143 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for ECMAScript 6 Proxy objects.
+ * @see https://tc39.github.io/ecma262/#sec-proxy-objects
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy
+ * @externs
+ */
+
+
+/**
+ * @record
+ * @template TARGET
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler
+ */
+function ProxyHandler() {}
+
+/**
+ * @type {(function(TARGET):?Object)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-getprototypeof
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getPrototypeOf
+ */
+ProxyHandler.prototype.getPrototypeOf /* = function(target) {} */;
+
+/**
+ * @type {(function(TARGET, ?Object):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-setprototypeof-v
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/setPrototypeOf
+ */
+ProxyHandler.prototype.setPrototypeOf /* = function(target, proto) {} */;
+
+/**
+ * @type {(function(TARGET):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-isextensible
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/isExtensible
+ */
+ProxyHandler.prototype.isExtensible /* = function(target) {} */;
+
+/**
+ * @type {(function(TARGET):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-preventextensions
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/preventExtensions
+ */
+ProxyHandler.prototype.preventExtensions /* = function(target) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol)):(!ObjectPropertyDescriptor|undefined))|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-getownproperty-p
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/getOwnPropertyDescriptor
+ */
+ProxyHandler.prototype.getOwnPropertyDescriptor /* = function(target, prop) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol), !ObjectPropertyDescriptor):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-defineownproperty-p-desc
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/defineProperty
+ */
+ProxyHandler.prototype.defineProperty /* = function(target, prop, desc) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol)):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-hasproperty-p
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/has
+ */
+ProxyHandler.prototype.has /* = function(target, prop) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol), !Object):*)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-get-p-receiver
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/get
+ */
+ProxyHandler.prototype.get /* = function(target, prop, receiver) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol), *, !Object):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-set-p-v-receiver
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/set
+ */
+ProxyHandler.prototype.set /* = function(target, prop, value, receiver) {} */;
+
+/**
+ * @type {(function(TARGET, (string|symbol)):boolean)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-delete-p
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/deleteProperty
+ */
+ProxyHandler.prototype.deleteProperty /* = function (target, prop) {} */;
+
+/**
+ * @type {(function(TARGET):!Array<(string|symbol)>)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-ownpropertykeys
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/ownKeys
+ */
+ProxyHandler.prototype.ownKeys /* = function(target) {} */;
+
+/**
+ * @type {(function(TARGET, *, !Array):*)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-call-thisargument-argumentslist
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/apply
+ */
+ProxyHandler.prototype.apply /* = function(target, thisArg, argList) {} */;
+
+/**
+ * @type {(function(TARGET, !Array, function(new: ?, ...?)):!Object)|undefined}
+ * @see https://tc39.github.io/ecma262/#sec-proxy-object-internal-methods-and-internal-slots-construct-argumentslist-newtarget
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/handler/construct
+ */
+ProxyHandler.prototype.construct /* = function(target, argList, newTarget) {} */;
+
+
+/**
+ * @constructor
+ * @param {TARGET} target
+ * @param {!ProxyHandler<TARGET>} handler
+ * @template TARGET
+ * @see https://tc39.github.io/ecma262/#sec-proxy-constructor
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy#Syntax
+ */
+function Proxy(target, handler) {}
+
+/**
+ * @param {TARGET} target
+ * @param {!ProxyHandler<TARGET>} handler
+ * @return {{proxy: !Proxy<TARGET>, revoke: function():void}}
+ * @template TARGET
+ * @see https://tc39.github.io/ecma262/#sec-proxy.revocable
+ * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/revocable
+ */
+Proxy.revocable = function(target, handler) {};
--- a/javascript/externs/web/fetchapi.js
+++ b/javascript/externs/web/fetchapi.js
@@ -37,8 +37,8 @@ var ReferrerPolicy;


 /**
- * @typedef {!Headers|!Array<!Array<string>>|!IObject<string,string>}
- * @see https://fetch.spec.whatwg.org/#headersinit
+ * @typedef {!Headers|!Array<!Array<string>>|!Object<string,string>}
+ * @see https://fetch.spec.whatwg.org/#typedefdef-headersinit
 */
 var HeadersInit;

@@ -64,7 +64,7 @@ Headers.prototype.append = function(name, value) {};
 */
 Headers.prototype.delete = function(name) {};

-/** @return {!Iterator<!Array<string>>} */
+/** @return {!IteratorIterable<!Array<string>>} */
 Headers.prototype.entries = function() {};

 /**
@@ -85,7 +85,7 @@ Headers.prototype.getAll = function(name) {};
 */
 Headers.prototype.has = function(name) {};

-/** @return {!Iterator<string>} */
+/** @return {!IteratorIterable<string>} */
 Headers.prototype.keys = function() {};

 /**
@@ -103,7 +103,8 @@ Headers.prototype[Symbol.iterator] = function() {};


 /**
- * @typedef {!Blob|!BufferSource|!FormData|string}
+ * @typedef {
+ *     !Blob|!BufferSource|!FormData|!URLSearchParams|!ReadableStream|string}
 * @see https://fetch.spec.whatwg.org/#bodyinit
 */
 var BodyInit;
@@ -208,6 +209,12 @@ Request.prototype.redirect;
 /** @type {string} */
 Request.prototype.integrity;

+/** @type {boolean} */
+Request.prototype.isHistoryNavigation;
+
+/** @type {(undefined|boolean)} */
+Request.prototype.keepalive;
+
 /** @return {!Request} */
 Request.prototype.clone = function() {};

@@ -248,6 +255,12 @@ RequestInit.prototype.redirect;
 /** @type {(undefined|string)} */
 RequestInit.prototype.integrity;

+/** @type {(undefined|!AbortSignal)} */
+RequestInit.prototype.signal;
+
+/** @type {(undefined|boolean)} */
+RequestInit.prototype.keepalive;
+
 /** @type {(undefined|null)} */
 RequestInit.prototype.window;

@@ -418,3 +431,10 @@ Window.prototype.fetch = function(input, opt_init) {};
 * @see https://fetch.spec.whatwg.org/#fetch-method
 */
 WorkerGlobalScope.prototype.fetch = function(input, opt_init) {};
+
+/**
+ * if WorkerOptions.type = 'module', it specifies how `scriptURL` is fetched.
+ * WorkerOptions is defined in html5.js.
+ * @type {!RequestCredentials|undefined}
+ */
+WorkerOptions.prototype.credentials;
--- a/javascript/externs/web/fido.js
+++ b/javascript/externs/web/fido.js
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions from the FIDO Specifications
+ * @see https://fidoalliance.org/download/
+ *
+ * @externs
+ * @author arnarbi@gmail.com (Arnar Birgisson)
+ */
+
+/**
+ * U2F JavaScript API namespace
+ * @see https://fidoalliance.org/specs/fido-u2f-v1.2-ps-20170411/fido-u2f-javascript-api-v1.2-ps-20170411.html
+ * @const
+ */
+var u2f = {};
+
+/**
+ * Data object for a single sign request.
+ * @typedef {string}
+ */
+u2f.Transport;
+
+/**
+ * Data object for a registered key.
+ * @typedef {{
+ *   version: string,
+ *   keyHandle: string,
+ *   transports: (!Array<!u2f.Transport>|undefined),
+ *   appId: ?string
+ * }}
+ */
+u2f.RegisteredKey;
+
+/**
+ * An error object for responses
+ * @typedef {{
+ *   errorCode: number,
+ *   errorMessage: ?string
+ * }}
+ */
+u2f.Error;
+
+/**
+ * Data object for a sign response.
+ * @typedef {{
+ *   keyHandle: string,
+ *   signatureData: string,
+ *   clientData: string
+ * }}
+ */
+u2f.SignResponse;
+
+/**
+ * @typedef {{
+ *   version: string,
+ *   challenge: string
+ * }}
+ */
+u2f.RegisterRequest
+
+/**
+ * @param {string} appId
+ * @param {string} challenge
+ * @param {!Array<!u2f.RegisteredKey>} registeredKeys
+ * @param {function((!u2f.Error|!u2f.SignResponse))} callback
+ * @param {number=} opt_timeoutSeconds
+ */
+u2f.sign = function(
+    appId, challenge, registeredKeys, callback, opt_timeoutSeconds) {};
+
+/**
+ * @param {string} appId
+ * @param {!Array<!u2f.RegisterRequest>} registerRequests
+ * @param {!Array<!u2f.RegisteredKey>} registeredKeys
+ * @param {function((!u2f.Error|!u2f.SignResponse))} callback
+ * @param {number=} opt_timeoutSeconds
+ */
+u2f.register = function(
+    appId, registerRequests, registeredKeys, callback, opt_timeoutSeconds) {};
--- a/javascript/externs/web/flash.js
+++ b/javascript/externs/web/flash.js
@@ -39,12 +39,12 @@ HTMLObjectElement.prototype.CallFunction = function(xmlString) {};
 * Returns the value of the Flash variable specified by varName or null if the
 * variable does not exist.
 * @param {string} varName The variable name.
- * @return {string?} The variable value.
+ * @return {?string} The variable value.
 */
 HTMLObjectElement.prototype.GetVariable = function(varName) {};

 /**
- * Activates the frame number specified by {@code frameNumber} in the current
+ * Activates the frame number specified by `frameNumber` in the current
 * movie.
 * @param {number} frameNumber A non-negative integer frame number.
 * @return {undefined}
@@ -57,8 +57,8 @@ HTMLObjectElement.prototype.GotoFrame = function(frameNumber) {};
 HTMLObjectElement.prototype.IsPlaying = function() {};

 /**
- * Loads the movie identified by {@code url} to the layer specified by {@code
- * layerNumber}.
+ * Loads the movie identified by `url` to the layer specified by
+ * `layerNumber`.
 * @param {number} layerNumber The layer number.
 * @param {string} url The movie URL.
 * @return {undefined}
@@ -136,7 +136,7 @@ HTMLObjectElement.prototype.Zoom = function(percent) {};
 // TellTarget Methods.

 /**
- * Executes the action in the timeline specified by {@code target} in the
+ * Executes the action in the timeline specified by `target` in the
 * specified frame.
 * @param {string} target The timeline.
 * @param {number} frameNumber The frame number.
@@ -145,7 +145,7 @@ HTMLObjectElement.prototype.Zoom = function(percent) {};
 HTMLObjectElement.prototype.TCallFrame = function(target, frameNumber) {};

 /**
- * Executes the action in the timeline specified by {@code target} in the
+ * Executes the action in the timeline specified by `target` in the
 * specified frame.
 * @param {string} target The timeline.
 * @param {string} label The frame label.
--- a/javascript/externs/web/gecko_dom.js
+++ b/javascript/externs/web/gecko_dom.js
@@ -47,12 +47,6 @@ Window.prototype.Components;
 */
 Window.prototype.content;

-/**
- * @type {boolean}
- * @see https://developer.mozilla.org/en/DOM/window.closed
- */
-Window.prototype.closed;
-
 /** @see https://developer.mozilla.org/en/DOM/window.controllers */
 Window.prototype.controllers;

@@ -72,109 +66,18 @@ Window.prototype.dialogArguments;
 /** @see https://developer.mozilla.org/en/DOM/window.directories */
 Window.prototype.directories;

-/**
- * @type {HTMLObjectElement|HTMLIFrameElement|null}
- * @see https://developer.mozilla.org/en/DOM/window.frameElement
- */
-Window.prototype.frameElement;
-
-/**
- * Allows lookup of frames by index or by name.
- * @type {?Object}
- * @see https://developer.mozilla.org/en/DOM/window.frames
- */
-Window.prototype.frames;
-
 /**
 * @type {boolean}
 * @see https://developer.mozilla.org/en/DOM/window.fullScreen
 */
 Window.prototype.fullScreen;

-/**
- * @return {!Promise<!BatteryManager>}
- * @see http://www.w3.org/TR/battery-status/
- */
-Navigator.prototype.getBattery = function() {};
-
-/**
- * @see https://developer.mozilla.org/en/DOM/Storage#globalStorage
- */
-Window.prototype.globalStorage;
-
-/**
- * @type {!History}
- * @suppress {duplicate}
- * @see https://developer.mozilla.org/en/DOM/window.history
- */
-var history;
-
-/**
- * Returns the number of frames (either frame or iframe elements) in the
- * window.
- *
- * @type {number}
- * @see https://developer.mozilla.org/en/DOM/window.length
- */
-Window.prototype.length;
-
-/**
- * Location has an exception in the DeclaredGlobalExternsOnWindow pass
- * so we have to manually include it:
- * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/DeclaredGlobalExternsOnWindow.java#L116
- *
- * @type {!Location}
- * @implicitCast
- * @see https://developer.mozilla.org/en/DOM/window.location
- */
-Window.prototype.location;
-
-/**
- * @see https://developer.mozilla.org/en/DOM/window.locationbar
- */
-Window.prototype.locationbar;
-
-/**
- * @see https://developer.mozilla.org/en/DOM/window.menubar
- */
-Window.prototype.menubar;
-
-/**
- * @type {string}
- * @see https://developer.mozilla.org/en/DOM/window.name
- */
-Window.prototype.name;
-
-/**
- * @type {Navigator}
- * @see https://developer.mozilla.org/en/DOM/window.navigator
- */
-Window.prototype.navigator;
-
-/**
- * @type {?Window}
- * @see https://developer.mozilla.org/en/DOM/window.opener
- */
-Window.prototype.opener;
-
-/**
- * @type {!Window}
- * @see https://developer.mozilla.org/en/DOM/window.parent
- */
-Window.prototype.parent;
-
-/** @see https://developer.mozilla.org/en/DOM/window.personalbar */
-Window.prototype.personalbar;
-
 /** @see https://developer.mozilla.org/en/DOM/window.pkcs11 */
 Window.prototype.pkcs11;

 /** @see https://developer.mozilla.org/en/DOM/window */
 Window.prototype.returnValue;

-/** @see https://developer.mozilla.org/en/DOM/window.scrollbars */
-Window.prototype.scrollbars;
-
 /**
 * @type {number}
 * @see https://developer.mozilla.org/En/DOM/window.scrollMaxX
@@ -187,97 +90,21 @@ Window.prototype.scrollMaxX;
 */
 Window.prototype.scrollMaxY;

-/**
- * @type {!Window}
- * @see https://developer.mozilla.org/en/DOM/window.self
- */
-Window.prototype.self;
-
-/** @see https://developer.mozilla.org/en/DOM/Storage#sessionStorage */
-Window.prototype.sessionStorage;
-
 /** @see https://developer.mozilla.org/en/DOM/window.sidebar */
 Window.prototype.sidebar;

-/**
- * @type {?string}
- * @see https://developer.mozilla.org/en/DOM/window.status
- */
-Window.prototype.status;
-
-/** @see https://developer.mozilla.org/en/DOM/window.statusbar */
-Window.prototype.statusbar;
-
-/** @see https://developer.mozilla.org/en/DOM/window.toolbar */
-Window.prototype.toolbar;
-
-/**
- * @type {!Window}
- * @see https://developer.mozilla.org/en/DOM/window.self
- */
-Window.prototype.top;
-
-/**
- * @type {!Window}
- * @see https://developer.mozilla.org/en/DOM/window.self
- */
-Window.prototype.window;
-
-/**
- * @param {*} message
- * @see https://developer.mozilla.org/en/DOM/window.alert
- * @return {undefined}
- */
-Window.prototype.alert = function(message) {};
-
-/**
- * Decodes a string of data which has been encoded using base-64 encoding.
- *
- * @param {string} encodedData
- * @return {string}
- * @see https://developer.mozilla.org/en/DOM/window.atob
- * @nosideeffects
- */
-function atob(encodedData) {}
-
 /**
 * @see https://developer.mozilla.org/en/DOM/window.back
 * @return {undefined}
 */
 Window.prototype.back = function() {};

-/**
- * @see https://developer.mozilla.org/en/DOM/window.blur
- * @return {undefined}
- */
-Window.prototype.blur = function() {};
-
-/**
- * @param {string} stringToEncode
- * @return {string}
- * @see https://developer.mozilla.org/en/DOM/window.btoa
- * @nosideeffects
- */
-function btoa(stringToEncode) {}
-
 /** @deprecated */
 Window.prototype.captureEvents;

-/**
- * @see https://developer.mozilla.org/en/DOM/window.close
- * @return {undefined}
- */
-Window.prototype.close = function() {};
-
 /**@see https://developer.mozilla.org/en/DOM/window.find */
 Window.prototype.find;

-/**
- * @see https://developer.mozilla.org/en/DOM/window.focus
- * @return {undefined}
- */
-Window.prototype.focus = function() {};
-
 /**
 * @see https://developer.mozilla.org/en/DOM/window.forward
 * @return {undefined}
@@ -290,13 +117,6 @@ Window.prototype.forward = function() {};
 */
 Window.prototype.getAttention = function() {};

-/**
- * @return {Selection}
- * @see https://developer.mozilla.org/en/DOM/window.getSelection
- * @nosideeffects
- */
-Window.prototype.getSelection = function() {};
-
 /**
 * @see https://developer.mozilla.org/en/DOM/window.home
 * @return {undefined}
@@ -318,12 +138,6 @@ Window.prototype.showModalDialog;

 Window.prototype.sizeToContent;

-/**
- * @see http://msdn.microsoft.com/en-us/library/ms536769(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.stop = function() {};
-
 Window.prototype.updateCommands;

 // properties of Document
@@ -345,8 +159,7 @@ Document.prototype.anchors;
 * @type {HTMLCollection<!HTMLAppletElement>}
 */
 Document.prototype.applets;
-/** @type {boolean} */ Document.prototype.async;
-/** @type {string?} */ Document.prototype.baseURI;
+/** @type {?string} */ Document.prototype.baseURI;

 /**
 * @see https://developer.mozilla.org/en/DOM/document.bgColor
@@ -365,6 +178,11 @@ Document.prototype.compatMode;

 Document.prototype.contentType;
 /** @type {string} */ Document.prototype.cookie;
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Document/defaultView
+ * @type {?Window}
+ */
 Document.prototype.defaultView;

 /**
@@ -401,9 +219,6 @@ Document.prototype.fgColor;
 */
 Document.prototype.forms;

-/** @type {number} */
-Document.prototype.height;
-
 /** @type {HTMLCollection<!HTMLImageElement>} */
 Document.prototype.images;

@@ -467,11 +282,6 @@ Document.prototype.vlinkColor;
 */
 Document.prototype.clear = function() {};

-/**
- * @see https://developer.mozilla.org/en/DOM/document.close
- */
-Document.prototype.close;
-
 /**
 * @param {string} type
 * @return {Event}
@@ -491,26 +301,8 @@ Document.prototype.evaluate;
 */
 Document.prototype.execCommand;

-/**
- * @param {string} name
- * @return {!NodeList<!Element>}
- * @nosideeffects
- * @see https://developer.mozilla.org/en/DOM/document.getElementsByClassName
- */
-Document.prototype.getElementsByClassName = function(name) {};
-
-/**
- * @param {string} uri
- * @return {undefined}
- */
-Document.prototype.load = function(uri) {};
 Document.prototype.loadOverlay;

-/**
- * @see https://developer.mozilla.org/en/DOM/document.open
- */
-Document.prototype.open;
-
 /**
 * @see https://developer.mozilla.org/en/Midas
 * @see http://msdn.microsoft.com/en-us/library/ms536676(VS.85).aspx
@@ -543,20 +335,6 @@ Document.prototype.queryCommandSupported;
 */
 Document.prototype.queryCommandValue;

-/**
- * @see https://developer.mozilla.org/en/DOM/document.write
- * @param {string} text
- * @return {undefined}
- */
-Document.prototype.write = function(text) {};
-
-/**
- * @see https://developer.mozilla.org/en/DOM/document.writeln
- * @param {string} text
- * @return {undefined}
- */
-Document.prototype.writeln = function(text) {};
-
 Document.prototype.ononline;
 Document.prototype.onoffline;

@@ -572,7 +350,7 @@ Document.prototype.getBoxObjectFor = function(element) {};
 // http://lxr.mozilla.org/mozilla1.8/source/dom/public/idl/range/nsIDOMNSRange.idl

 /**
- * @param {string} tag
+ * @param {!TrustedHTML|string} tag
 * @return {DocumentFragment}
 */
 Range.prototype.createContextualFragment;
@@ -607,128 +385,6 @@ Range.prototype.intersectsNode;
 */
 Range.prototype.compareNode;

-
-/** @constructor */
-function Selection() {}
-
-/**
- * @type {Node}
- * @see https://developer.mozilla.org/en/DOM/Selection/anchorNode
- */
-Selection.prototype.anchorNode;
-
-/**
- * @type {number}
- * @see https://developer.mozilla.org/en/DOM/Selection/anchorOffset
- */
-Selection.prototype.anchorOffset;
-
-/**
- * @type {Node}
- * @see https://developer.mozilla.org/en/DOM/Selection/focusNode
- */
-Selection.prototype.focusNode;
-
-/**
- * @type {number}
- * @see https://developer.mozilla.org/en/DOM/Selection/focusOffset
- */
-Selection.prototype.focusOffset;
-
-/**
- * @type {boolean}
- * @see https://developer.mozilla.org/en/DOM/Selection/isCollapsed
- */
-Selection.prototype.isCollapsed;
-
-/**
- * @type {number}
- * @see https://developer.mozilla.org/en/DOM/Selection/rangeCount
- */
-Selection.prototype.rangeCount;
-
-/**
- * @param {Range} range
- * @return {undefined}
- * @see https://developer.mozilla.org/en/DOM/Selection/addRange
- */
-Selection.prototype.addRange = function(range) {};
-
-/**
- * @param {number} index
- * @return {Range}
- * @see https://developer.mozilla.org/en/DOM/Selection/getRangeAt
- * @nosideeffects
- */
-Selection.prototype.getRangeAt = function(index) {};
-
-/**
- * @param {Node} node
- * @param {number} index
- * @return {undefined}
- * @see https://developer.mozilla.org/en/DOM/Selection/collapse
- */
-Selection.prototype.collapse = function(node, index) {};
-
-/**
- * @return {undefined}
- * @see https://developer.mozilla.org/en/DOM/Selection/collapseToEnd
- */
-Selection.prototype.collapseToEnd = function() {};
-
-/**
- * @return {undefined}
- * @see https://developer.mozilla.org/en/DOM/Selection/collapseToStart
- */
-Selection.prototype.collapseToStart = function() {};
-
-/**
- * @param {Node} node
- * @param {boolean} partlyContained
- * @return {boolean}
- * @see https://developer.mozilla.org/en/DOM/Selection/containsNode
- * @nosideeffects
- */
-Selection.prototype.containsNode = function(node, partlyContained) {};
-
-/**
- * @see https://developer.mozilla.org/en/DOM/Selection/deleteFromDocument
- * @return {undefined}
- */
-Selection.prototype.deleteFromDocument = function() {};
-
-/**
- * @param {Node} parentNode
- * @param {number} offset
- * @see https://developer.mozilla.org/en/DOM/Selection/extend
- * @return {undefined}
- */
-Selection.prototype.extend = function(parentNode, offset) {};
-
-/**
- * @see https://developer.mozilla.org/en/DOM/Selection/removeAllRanges
- * @return {undefined}
- */
-Selection.prototype.removeAllRanges = function() {};
-
-/**
- * @param {Range} range
- * @see https://developer.mozilla.org/en/DOM/Selection/removeRange
- * @return {undefined}
- */
-Selection.prototype.removeRange = function(range) {};
-
-/**
- * @param {Node} parentNode
- * @see https://developer.mozilla.org/en/DOM/Selection/selectAllChildren
- */
-Selection.prototype.selectAllChildren;
-
-/**
- * @see https://developer.mozilla.org/en/DOM/Selection/selectionLanguageChange
- */
-Selection.prototype.selectionLanguageChange;
-
 /**
 * @type {!NodeList<!Element>}
 * @see https://developer.mozilla.org/en/DOM/element.children
@@ -741,22 +397,6 @@ Element.prototype.children;
 */
 Element.prototype.firebugIgnore;

-/**
- * Note: According to the spec, id is actually defined on HTMLElement and
- * SVGElement, rather than Element. Deliberately ignore this so that saying
- * Element.id is allowed.
- * @type {string}
- * @implicitCast
- */
-Element.prototype.id;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Parsing/#widl-Element-innerHTML
- * @implicitCast
- */
-Element.prototype.innerHTML;
-
 /**
 * Note: According to the spec, name is defined on specific types of
 * HTMLElements, rather than on Node, Element, or HTMLElement directly.
@@ -775,36 +415,9 @@ Element.prototype.nodePrincipal;
 */
 Element.prototype.style;

-/**
- * @override
- * @return {!Element}
- */
-Element.prototype.cloneNode = function(deep) {};
-
-/** @return {undefined} */
-Element.prototype.blur = function() {};
-
 /** @return {undefined} */
 Element.prototype.click = function() {};

-/** @return {undefined} */
-Element.prototype.focus = function() {};
-
-/** @type {number} */
-HTMLInputElement.prototype.selectionStart;
-
-/** @type {number} */
-HTMLInputElement.prototype.selectionEnd;
-
-/**
- * @param {number} selectionStart
- * @param {number} selectionEnd
- * @see http://www.whatwg.org/specs/web-apps/current-work/multipage/editing.html#dom-textarea/input-setselectionrange
- * @return {undefined}
- */
-HTMLInputElement.prototype.setSelectionRange =
-    function(selectionStart, selectionEnd) {};
-
 /** @type {number} */
 HTMLTextAreaElement.prototype.selectionStart;

@@ -820,6 +433,17 @@ HTMLTextAreaElement.prototype.selectionEnd;
 HTMLTextAreaElement.prototype.setSelectionRange =
    function(selectionStart, selectionEnd) {};

+/**
+ * @param {string} replacement
+ * @param {number=} start
+ * @param {number=} end
+ * @param {string=} selectionMode
+ * @see https://html.spec.whatwg.org/#dom-textarea/input-setrangetext
+ * @return {undefined}
+ */
+HTMLTextAreaElement.prototype.setRangeText =
+    function(replacement, start, end, selectionMode) {};
+
 /**
 * @type {string}
 * @see https://developer.mozilla.org/en/Navigator.buildID
@@ -852,7 +476,7 @@ Navigator.prototype.securityPolicy;

 /**
 * @param {string} url
- * @param {ArrayBufferView|Blob|string|FormData=} opt_data
+ * @param {ArrayBufferView|Blob|string|FormData|URLSearchParams=} opt_data
 * @return {boolean}
 * @see https://developer.mozilla.org/en-US/docs/Web/API/navigator.sendBeacon
 */
--- a/javascript/externs/web/gecko_event.js
+++ b/javascript/externs/web/gecko_event.js
@@ -24,12 +24,11 @@

 // TODO: Almost all of it has not been annotated with types.

-/** @type {number} */ Event.prototype.HORIZONTAL_AXIS;
-/** @type {number} */ Event.prototype.VERTICAL_AXIS;
+/** @const {number} */ Event.prototype.HORIZONTAL_AXIS;
+/** @const {number} */ Event.prototype.VERTICAL_AXIS;
 /** @type {boolean} */ Event.prototype.altKey;
 /** @type {number} */ Event.prototype.axis;
 /** @type {number} */ Event.prototype.button;
-/** @type {boolean} */ Event.prototype.cancelBubble;
 /** @type {number} */ Event.prototype.charCode;
 /** @type {number} */ Event.prototype.clientX;
 /** @type {number} */ Event.prototype.clientY;
@@ -51,12 +50,36 @@
 /** @type {Window} */ Event.prototype.view;
 /** @type {number} */ Event.prototype.which;

+/**
+ * @type {boolean}
+ * @deprecated cancelBubble is obsolete and is no-op in modern browsers. Use
+ *     stopPropagation() instead.
+ */
+Event.prototype.cancelBubble;
+
 /** @constructor */ function nsIDOMPageTransitionEvent() {}
 /** @type {boolean} */ nsIDOMPageTransitionEvent.prototype.persisted;

 //Methods
 Event.prototype.initKeyEvent;
-Event.prototype.initMouseEvent;
+/**
+ * @param {string} typeArg
+ * @param {boolean=} canBubbleArg
+ * @param {boolean=} cancelableArg
+ * @param {?Window=} viewArg
+ * @param {?number=} detailArg
+ * @param {number=} screenXArg
+ * @param {number=} screenYArg
+ * @param {number=} clientXArg
+ * @param {number=} clientYArg
+ * @param {boolean=} ctrlKeyArg
+ * @param {boolean=} altKeyArg
+ * @param {boolean=} shiftKeyArg
+ * @param {boolean=} metaKeyArg
+ * @param {?number=} buttonArg
+ * @param {?EventTarget=} relatedTargetArg
+ */
+Event.prototype.initMouseEvent = function(typeArg, canBubbleArg, cancelableArg, viewArg, detailArg, screenXArg, screenYArg, clientXArg, clientYArg, ctrlKeyArg, altKeyArg, shiftKeyArg, metaKeyArg, buttonArg, relatedTargetArg) {};
 Event.prototype.initUIEvent;
 Event.prototype.initMessageEvent;
 Event.prototype.preventBubble;
--- a/javascript/externs/web/gecko_xml.js
+++ b/javascript/externs/web/gecko_xml.js
@@ -66,8 +66,8 @@ function DOMParser() {}
 *  var parser = new DOMParser();
 *  var doc = parser.parseFromString(aStr, "text/xml");
 *
- * @param {string} src The UTF16 string to be parsed.
+ * @param {!TrustedHTML|string} src The UTF16 string to be parsed.
 * @param {string} type The content type of the string.
- * @return {Document}
+ * @return {!Document}
 */
 DOMParser.prototype.parseFromString = function(src, type) {};
--- a/javascript/externs/web/google_legacy.js
+++ b/javascript/externs/web/google_legacy.js
@@ -0,0 +1,31 @@
+/*
+ * Copyright 2010 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Declaration of the type level google namespace.
+ * @externs
+ * @author nicksantos@google.com (Nick Santos)
+ */
+
+/**
+ * Suppresses the compiler warning when multiple externs files declare the
+ * google namespace.
+ * @suppress {duplicate,strictMissingProperties}
+ * NOTE: This definition should be marked \@const, and when it is we can remove
+ * the "strictMissingProperties" suppression.
+ */
+// TODO(nicksantos): Consolidate to one google namespace declaration.
+var google = {};
--- a/javascript/externs/web/html5.js
+++ b/javascript/externs/web/html5.js
--- a/javascript/externs/web/ie_css.js
+++ b/javascript/externs/web/ie_css.js
@@ -252,6 +252,9 @@ CSSProperties.prototype.MsWritingMode;
 /** @type {string} */
 CSSProperties.prototype.MsZoom;

+/** @type {string} */
+CSSProperties.prototype.msUserSelect;
+
 // See: http://msdn.microsoft.com/en-us/library/windows/apps/Hh702466.aspx

 /** @type {string} */
--- a/javascript/externs/web/ie_dom.js
+++ b/javascript/externs/web/ie_dom.js
@@ -120,14 +120,6 @@ XMLDOMDocument.prototype.abort = function() {};
 */
 XMLDOMDocument.prototype.createNode = function(type, name, namespaceURI) {};

-/**
- * @param {string} xmlSource
- * @return {undefined}
- * @see http://msdn.microsoft.com/en-us/library/ms762722(VS.85).aspx
- * @override
- */
-XMLDOMDocument.prototype.load = function(xmlSource) {};
-
 /**
 * @param {string} xmlString
 * @return {boolean}
@@ -179,13 +171,12 @@ Node.prototype.document;
 * Inserts the given HTML text into the element at the location.
 * @param {string} sWhere Where to insert the HTML text, one of 'beforeBegin',
 *     'afterBegin', 'beforeEnd', 'afterEnd'.
- * @param {string} sText HTML text to insert.
+ * @param {!TrustedHTML|string} sText HTML text to insert.
 * @see http://msdn.microsoft.com/en-us/library/ms536452(VS.85).aspx
 * @return {undefined}
 */
 Node.prototype.insertAdjacentHTML = function(sWhere, sText) {};

-
 /**
 * @type {*}
 * @see http://msdn.microsoft.com/en-us/library/ms762308(VS.85).aspx
@@ -204,12 +195,6 @@ Node.prototype.nodeTypeString;
 */
 Node.prototype.parsed;

-/**
- * @type {Element}
- * @see http://msdn.microsoft.com/en-us/library/ms534327(VS.85).aspx
- */
-Node.prototype.parentElement;
-
 /**
 * @type {boolean}
 * @see http://msdn.microsoft.com/en-us/library/ms753816(VS.85).aspx
@@ -300,12 +285,6 @@ ClipboardData.prototype.setData = function(type, data) {};
 */
 ClipboardData.prototype.getData = function(type) { };

-/**
- * @type {!Window}
- * @see https://developer.mozilla.org/en/DOM/window
- */
-var window;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms535220(VS.85).aspx
 * @type {ClipboardData}
@@ -354,11 +333,13 @@ Window.prototype.offscreenBuffering;

 /**
 * @see http://msdn.microsoft.com/en-us/library/ms534389(VS.85).aspx
+ * @type {number|undefined}
 */
 Window.prototype.screenLeft;

 /**
 * @see http://msdn.microsoft.com/en-us/library/ms534389(VS.85).aspx
+ * @type {number|undefined}
 */
 Window.prototype.screenTop;

@@ -388,65 +369,12 @@ Window.prototype.detachEvent;
 */
 Window.prototype.execScript;

-/**
- * @see http://msdn.microsoft.com/en-us/library/ms536425(VS.85).aspx
- */
-Window.prototype.focus;
-
-/**
- * @param {number} x
- * @param {number} y
- * @see http://msdn.microsoft.com/en-us/library/ms536618(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.moveBy = function(x, y) {};
-
-/**
- * @param {number} x
- * @param {number} y
- * @see http://msdn.microsoft.com/en-us/library/ms536626(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.moveTo = function(x, y) {};

 /**
 * @see http://msdn.microsoft.com/en-us/library/ms536638(VS.85).aspx
 */
 Window.prototype.navigate;

-/**
- * @param {*=} opt_url
- * @param {string=} opt_windowName
- * @param {string=} opt_windowFeatures
- * @param {boolean=} opt_replace
- * @return {Window}
- * @see http://msdn.microsoft.com/en-us/library/ms536651(VS.85).aspx
- */
-Window.prototype.open = function(opt_url, opt_windowName, opt_windowFeatures,
-                                 opt_replace) {};
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms536672(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.print = function() {};
-
-/**
- * @param {number} width
- * @param {number} height
- * @see http://msdn.microsoft.com/en-us/library/ms536722(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.resizeBy = function(width, height) {};
-
-/**
- * @param {number} width
- * @param {number} height
- * @see http://msdn.microsoft.com/en-us/library/ms536723(VS.85).aspx
- * @return {undefined}
- */
-Window.prototype.resizeTo = function(width, height) {};
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms536738(VS.85).aspx
 */
@@ -469,32 +397,10 @@ Window.prototype.showModelessDialog;
 Window.prototype.external;

 /**
- * @see http://msdn.microsoft.com/en-us/library/ms535864(VS.85).aspx
- * @param {number|string} delta The number of entries to go back, or
- *     the URL to which to go back. (URL form is supported only in IE)
- * @return {undefined}
+ * @see https://msdn.microsoft.com/en-us/ie/dn265046(v=vs.94)
+ * @const {!Object}
 */
-History.prototype.go = function(delta) {};
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms535864(VS.85).aspx
- * @param {number=} opt_distance The number of entries to go back
- *     (Mozilla doesn't support distance -- use #go instead)
- * @return {undefined}
- */
-History.prototype.back = function(opt_distance) {};
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms535864(VS.85).aspx
- * @type {number}
- */
-History.prototype.length;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms535864(VS.85).aspx
- * @return {undefined}
- */
-History.prototype.forward = function() {};
+Window.prototype.msCrypto;

 /**
 * @type {boolean}
@@ -516,12 +422,6 @@ HTMLFrameElement.prototype.contentWindow;
 */
 HTMLIFrameElement.prototype.allowTransparency;

-/**
- * @type {Window}
- * @see http://msdn.microsoft.com/en-us/library/ms533692(VS.85).aspx
- */
-HTMLIFrameElement.prototype.contentWindow;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms536385(VS.85).aspx
 */
@@ -761,24 +661,6 @@ TextRange.prototype.select = function() {};
 */
 TextRange.prototype.setEndPoint;

-/**
- * @return {undefined}
- * @see http://msdn.microsoft.com/en-us/library/ms536418(VS.85).aspx
- */
-Selection.prototype.clear = function() {};
-
-/**
- * @return {TextRange|ControlRange}
- * @see http://msdn.microsoft.com/en-us/library/ms536394(VS.85).aspx
- */
-Selection.prototype.createRange = function() {};
-
-/**
- * @return {Array<TextRange>}
- * @see http://msdn.microsoft.com/en-us/library/ms536396(VS.85).aspx
- */
-Selection.prototype.createRangeCollection = function() {};
-
 /**
 * @constructor
 * @see http://msdn.microsoft.com/en-us/library/ms537447(VS.85).aspx
@@ -791,11 +673,6 @@ Document.prototype.loadXML;

 // http://msdn.microsoft.com/en-us/library/ms531073(VS.85).aspx

-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533065(VS.85).aspx
- */
-Document.prototype.activeElement;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms533553(VS.85).aspx
 */
@@ -806,11 +683,6 @@ Document.prototype.charset;
 */
 Document.prototype.cookie;

-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533714(VS.85).aspx
- */
-Document.prototype.defaultCharset;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms533731(VS.85).aspx
 */
@@ -843,6 +715,7 @@ Document.prototype.fileSize;

 /**
 * @see http://msdn.microsoft.com/en-us/library/ms534331(VS.85).aspx
+ * @type {?Window}
 */
 Document.prototype.parentWindow;

@@ -857,12 +730,6 @@ Document.prototype.protocol;
 */
 HTMLDocument.prototype.readyState;

-/**
- * @type {Selection}
- * @see http://msdn.microsoft.com/en-us/library/ms535869(VS.85).aspx
- */
-Document.prototype.selection;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms534704(VS.85).aspx
 */
@@ -914,12 +781,6 @@ Document.prototype.detachEvent;
 */
 Document.prototype.focus;

-/**
- * @see http://msdn.microsoft.com/en-us/library/ms536447(VS.85).aspx
- * @return {boolean}
- */
-Document.prototype.hasFocus = function() {};
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms536614(VS.85).aspx
 */
@@ -965,6 +826,7 @@ Document.prototype.namespaces;

 /**
 * @see http://msdn.microsoft.com/en-us/library/ms537487(VS.85).aspx
+ * @type {!HTMLCollection<!HTMLScriptElement>}
 */
 Document.prototype.scripts;

@@ -1008,7 +870,8 @@ Element.prototype.componentFromPoint = function(iCoordX, iCoordY) {};


 /**
- * @type {boolean}
+ * TODO(tjgq): Make this string once existing usages have been migrated.
+ * @type {string|boolean}
 * @see http://msdn.microsoft.com/en-us/library/ms533690(VS.85).aspx
 */
 Element.prototype.contentEditable;
@@ -1051,11 +914,18 @@ Element.prototype.fireEvent;
 Element.prototype.hideFocus;

 /**
+ * @type {string}
+ * @implicitCast
+ *
+ * TODO(lharker): remove the @implicitCast to enforce assigning an explicit
+ * string to innerText instead of relying on coercion.
+ *
 * @see http://msdn.microsoft.com/en-us/library/ms533899.aspx
 */
 Element.prototype.innerText;

 /**
+ * @type {boolean}
 * @see http://msdn.microsoft.com/en-us/library/ms537838(VS.85).aspx
 */
 Element.prototype.isContentEditable;
@@ -1098,18 +968,6 @@ Element.prototype.onmouseenter;
 */
 Element.prototype.onmouseleave;

-/**
- * @type {?function(Event)}
- * @see http://msdn.microsoft.com/en-us/library/ms536969(VS.85).aspx
- */
-Element.prototype.onselectstart;
-
-/**
- * @type {string}
- * @see http://msdn.microsoft.com/en-us/library/aa752326(VS.85).aspx
- */
-Element.prototype.outerHTML;
-
 /**
 * @see http://msdn.microsoft.com/en-us/library/ms536689(VS.85).aspx
 * @return {undefined}
@@ -1211,94 +1069,6 @@ function AlphaImageLoaderFilter() {}
 */
 AlphaImageLoaderFilter.prototype.sizingMethod;

-/**
- * @constructor
- * @see http://msdn.microsoft.com/en-us/library/ms535866(VS.85).aspx
- */
-function Location() {}
-
-/**
- * @see http://trac.webkit.org/changeset/113945
- * @type {DOMStringList}
- */
-Location.prototype.ancestorOrigins;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533775(VS.85).aspx
- * @type {string}
- */
-Location.prototype.hash;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533784(VS.85).aspx
- * @type {string}
- */
-Location.prototype.host;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533785(VS.85).aspx
- * @type {string}
- */
-Location.prototype.hostname;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms533867(VS.85).aspx
- * @type {string}
- */
-Location.prototype.href;
-
-/**
- * @see https://docs.google.com/document/view?id=1r_VTFKApVOaNIkocrg0z-t7lZgzisTuGTXkdzAk4gLU&hl=en
- * @type {string}
- */
-Location.prototype.origin;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms534332(VS.85).aspx
- * @type {string}
- */
-Location.prototype.pathname;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms534342(VS.85).aspx
- */
-Location.prototype.port;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms534353(VS.85).aspx
- * @type {string}
- */
-Location.prototype.protocol;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms534620(VS.85).aspx
- * @type {string}
- */
-Location.prototype.search;
-
-/**
- * @see http://msdn.microsoft.com/en-us/library/ms536342(VS.85).aspx
- * @param {string} url
- * @return {undefined}
- */
-Location.prototype.assign = function(url) {};
-
-/**
- * @param {boolean=} opt_forceReload If true, reloads the page from
- *     the server. Defaults to false.
- * @see http://msdn.microsoft.com/en-us/library/ms536691(VS.85).aspx
- * @return {undefined}
- */
-Location.prototype.reload = function(opt_forceReload) {};
-
-/**
- * @param {string} url
- * @see http://msdn.microsoft.com/en-us/library/ms536712(VS.85).aspx
- * @return {undefined}
- */
-Location.prototype.replace = function(url) {};
-
-
 // For IE, returns an object representing key-value pairs for all the global
 // variables prefixed with str, e.g. test*

--- a/javascript/externs/web/ie_event.js
+++ b/javascript/externs/web/ie_event.js
@@ -71,7 +71,7 @@ Event.prototype.propertyName;
 /** @type {string} */
 Event.prototype.qualifier;

-/** @type {number} */
+/** @type {?} */
 Event.prototype.reason;

 /** @type {Object<*>} */
@@ -135,13 +135,13 @@ MSPointerPoint.prototype.pointerType;
 */
 function MSPointerEvent() {}

-/** @type {number} */
+/** @const {number} */
 MSPointerEvent.MSPOINTER_TYPE_MOUSE;

-/** @type {number} */
+/** @const {number} */
 MSPointerEvent.MSPOINTER_TYPE_PEN;

-/** @type {number} */
+/** @const {number} */
 MSPointerEvent.MSPOINTER_TYPE_TOUCH;

 /** @type {number} */
--- a/javascript/externs/web/intersection_observer.js
+++ b/javascript/externs/web/intersection_observer.js
@@ -0,0 +1,178 @@
+/*
+ * Copyright 2016 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Externs for Intersection Observer objects.
+ * @see https://w3c.github.io/IntersectionObserver/
+ * @externs
+ */
+
+// TODO(user): Once the Intersection Observer spec is adopted by W3C, add
+// a w3c_ prefix to this file's name.
+
+
+/**
+ * These contain the information provided from a change event.
+ * @see https://w3c.github.io/IntersectionObserver/#intersection-observer-entry
+ * @record
+ */
+function IntersectionObserverEntry() {}
+
+/**
+ * The time the change was observed.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-time
+ * @const {number}
+ */
+IntersectionObserverEntry.prototype.time;
+
+/**
+ * The root intersection rectangle, if target belongs to the same unit of
+ * related similar-origin browsing contexts as the intersection root, null
+ * otherwise.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-rootbounds
+ * @const {{top: number, right: number, bottom: number, left: number,
+ *     height: number, width: number}}
+ */
+IntersectionObserverEntry.prototype.rootBounds;
+
+/**
+ * The rectangle describing the element being observed.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-boundingclientrect
+ * @const {!{top: number, right: number, bottom: number, left: number,
+ *     height: number, width: number}}
+ */
+IntersectionObserverEntry.prototype.boundingClientRect;
+
+/**
+ * The rectangle describing the intersection between the observed element and
+ * the viewport.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-intersectionrect
+ * @const {!{top: number, right: number, bottom: number, left: number,
+ *     height: number, width: number}}
+ */
+IntersectionObserverEntry.prototype.intersectionRect;
+
+/**
+ * Ratio of intersectionRect area to boundingClientRect area.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-intersectionratio
+ * @const {number}
+ */
+IntersectionObserverEntry.prototype.intersectionRatio;
+
+/**
+ * The Element whose intersection with the intersection root changed.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-target
+ * @const {!Element}
+ */
+IntersectionObserverEntry.prototype.target;
+
+/**
+ * Whether or not the target is intersecting with the root.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserverentry-isintersecting
+ * @const {boolean}
+ */
+IntersectionObserverEntry.prototype.isIntersecting;
+
+/**
+ * Whether or not the target is visible with the root.
+ * @see https://w3c.github.io/IntersectionObserver/v2/#dom-intersectionobserverentry-isvisible
+ * @const {boolean|undefined}
+ */
+IntersectionObserverEntry.prototype.isVisible;
+
+/**
+ * Callback for the IntersectionObserver.
+ * @see https://w3c.github.io/IntersectionObserver/#intersection-observer-callback
+ * @typedef {function(!Array<!IntersectionObserverEntry>,!IntersectionObserver)}
+ */
+var IntersectionObserverCallback;
+
+/**
+ * Options for the IntersectionObserver.
+ * @see https://w3c.github.io/IntersectionObserver/v2/#intersection-observer-init
+ * @typedef {{
+ *   threshold: (!Array<number>|number|undefined),
+ *   delay: (number|undefined),
+ *   trackVisibility: (boolean|undefined),
+ *   root: (?Element|undefined),
+ *   rootMargin: (string|undefined)
+ * }}
+ */
+var IntersectionObserverInit;
+
+/**
+ * This is the constructor for Intersection Observer objects.
+ * @see https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
+ * @param {!IntersectionObserverCallback} handler The callback for the observer.
+ * @param {!IntersectionObserverInit=} opt_options The object defining the
+ *     thresholds, etc.
+ * @constructor
+ */
+function IntersectionObserver(handler, opt_options) {};
+
+/**
+ * The root Element to use for intersection, or null if the observer uses the
+ * implicit root.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-root
+ * @const {?Element}
+ */
+IntersectionObserver.prototype.root;
+
+/**
+ * Offsets applied to the intersection root’s bounding box, effectively growing
+ * or shrinking the box that is used to calculate intersections.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-rootmargin
+ * @const {string}
+ */
+IntersectionObserver.prototype.rootMargin;
+
+/**
+ * A list of thresholds, sorted in increasing numeric order, where each
+ * threshold is a ratio of intersection area to bounding box area of an observed
+ * target.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-thresholds
+ * @const {!Array<number>}
+ */
+IntersectionObserver.prototype.thresholds;
+
+/**
+ * This is used to set which element to observe.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-observe
+ * @param {!Element} element The element to observe.
+ * @return {undefined}
+ */
+IntersectionObserver.prototype.observe = function(element) {};
+
+/**
+ * This is used to stop observing a given element.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-unobserve
+ * @param {!Element} element The elmenent to stop observing.
+ * @return {undefined}
+ */
+IntersectionObserver.prototype.unobserve = function(element) {};
+
+/**
+ * Disconnect.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-disconnect
+ */
+IntersectionObserver.prototype.disconnect = function() {};
+
+/**
+ * Take records.
+ * @see https://w3c.github.io/IntersectionObserver/#dom-intersectionobserver-takerecords
+ * @return {!Array.<!IntersectionObserverEntry>}
+ */
+IntersectionObserver.prototype.takeRecords = function() {};
--- a/javascript/externs/web/intl.js
+++ b/javascript/externs/web/intl.js
@@ -1,167 +0,0 @@
-/*
- * Copyright 2013 The Closure Compiler Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * @fileoverview Definitions for the JS Internationalization API as defined in
- * http://www.ecma-international.org/ecma-402/1.0/
- *
- * @externs
- */
-
-/** @const */
-var Intl = {};
-
-/**
- * NOTE: this API is not from ecma402 and is subject to change.
- * @param {string|Array<string>=} opt_locales
- * @param {{type: (string|undefined)}=}
- *         opt_options
- * @constructor
- */
-Intl.v8BreakIterator = function(opt_locales, opt_options) {};
-
-/**
- * @param {string} text
- * @return {undefined}
- */
-Intl.v8BreakIterator.prototype.adoptText = function(text) {};
-
-/**
- * @return {string}
- */
-Intl.v8BreakIterator.prototype.breakType = function() {};
-
-/**
- * @return {number}
- */
-Intl.v8BreakIterator.prototype.current = function() {};
-
-/**
- * @return {number}
- */
-Intl.v8BreakIterator.prototype.first = function() {};
-
-/**
- * @return {number}
- */
-Intl.v8BreakIterator.prototype.next = function() {};
-
-/**
- * @constructor
- * @param {string|Array<string>=} opt_locales
- * @param {{usage: (string|undefined), localeMatcher: (string|undefined),
- *     sensitivity: (string|undefined), ignorePunctuation: (boolean|undefined),
- *     numeric: (boolean|undefined), caseFirst: (string|undefined)}=}
- *         opt_options
- */
-Intl.Collator = function(opt_locales, opt_options) {};
-
-/**
- * @param {Array<string>} locales
- * @param {{localeMatcher: (string|undefined)}=} opt_options
- * @return {Array<string>}
- */
-Intl.Collator.supportedLocalesOf = function(locales, opt_options) {};
-
-/**
- * @param {string} arg1
- * @param {string} arg2
- * @return {number}
- */
-Intl.Collator.prototype.compare = function(arg1, arg2) {};
-
-/**
- * @return {{locale: string, usage: string, sensitivity: string,
- *     ignorePunctuation: boolean, collation: string, numeric: boolean,
- *     caseFirst: string}}
- */
-Intl.Collator.prototype.resolvedOptions = function() {};
-
-/**
- * @constructor
- * @param {string|Array<string>=} opt_locales
- * @param {{localeMatcher: (string|undefined), useGrouping: (boolean|undefined),
- *     numberingSystem: (string|undefined), style: (string|undefined),
- *     currency: (string|undefined), currencyDisplay: (string|undefined),
- *     minimumIntegerDigits: (number|undefined),
- *     minimumFractionDigits: (number|undefined),
- *     maximumFractionDigits: (number|undefined),
- *     minimumSignificantDigits: (number|undefined),
- *     maximumSignificantDigits: (number|undefined)}=}
- *         opt_options
- */
-Intl.NumberFormat = function(opt_locales, opt_options) {};
-
-/**
- * @param {Array<string>} locales
- * @param {{localeMatcher: (string|undefined)}=} opt_options
- * @return {Array<string>}
- */
-Intl.NumberFormat.supportedLocalesOf = function(locales, opt_options) {};
-
-/**
- * @param {number} num
- * @return {string}
- */
-Intl.NumberFormat.prototype.format = function(num) {};
-
-/**
- * @return {{locale: string, numberingSystem: string, style: string,
- *     currency: (string|undefined), currencyDisplay: (string|undefined),
- *     minimumIntegerDigits: number, minimumFractionDigits: number,
- *     maximumFractionDigits: number, minimumSignificantDigits: number,
- *     maximumSignificantDigits: number, useGrouping: boolean}}
- */
-Intl.NumberFormat.prototype.resolvedOptions = function() {};
-
-/**
- * @constructor
- * @param {string|Array<string>=} opt_locales
- * @param {{localeMatcher: (string|undefined),
- *    formatMatcher: (string|undefined), calendar: (string|undefined),
- *    numberingSystem: (string|undefined), tz: (string|undefined),
- *    weekday: (string|undefined), era: (string|undefined),
- *    year: (string|undefined), month: (string|undefined),
- *    day: (string|undefined), hour: (string|undefined),
- *    minute: (string|undefined), second: (string|undefined),
- *    timeZoneName: (string|undefined), hour12: (boolean|undefined)}=}
- *        opt_options
- */
-Intl.DateTimeFormat = function(opt_locales, opt_options) {};
-
-/**
- * @param {Array<string>} locales
- * @param {{localeMatcher: string}=} opt_options
- * @return {Array<string>}
- */
-Intl.DateTimeFormat.supportedLocalesOf = function(locales, opt_options) {};
-
-/**
- * @param {(!Date|number)=} date
- * @return {string}
- */
-Intl.DateTimeFormat.prototype.format = function(date) {};
-
-/**
- * @return {{locale: string, calendar: string, numberingSystem: string,
- *    timeZone: (string|undefined), weekday: (string|undefined),
- *    era: (string|undefined), year: (string|undefined),
- *    month: (string|undefined), day: (string|undefined),
- *    hour: (string|undefined), minute: (string|undefined),
- *    second: (string|undefined), timeZoneName: (string|undefined),
- *    hour12: (boolean|undefined)}}
- */
-Intl.DateTimeFormat.prototype.resolvedOptions = function() {};
--- a/javascript/externs/web/mediakeys.js
+++ b/javascript/externs/web/mediakeys.js
@@ -0,0 +1,305 @@
+/*
+ * Copyright 2015 The Closure Compiler authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview MediaKey externs.
+ * Based on {@link https://w3c.github.io/encrypted-media/ EME draft 5 December
+ * 2019}.
+ * @externs
+ */
+
+
+/**
+ * @typedef {{
+ *   contentType: string,
+ *   encryptionScheme: (?string|undefined),
+ *   robustness: (string|undefined)
+ * }}
+ * @see https://w3c.github.io/encrypted-media/#mediakeysystemmediacapability-dictionary
+ */
+var MediaKeySystemMediaCapability;
+
+
+/** @typedef {{
+ *   label: (string|undefined),
+ *   initDataTypes: (!Array<string>|undefined),
+ *   audioCapabilities: (!Array<!MediaKeySystemMediaCapability>|undefined),
+ *   videoCapabilities: (!Array<!MediaKeySystemMediaCapability>|undefined),
+ *   distinctiveIdentifier: (string|undefined),
+ *   persistentState: (string|undefined),
+ *   sessionTypes: (!Array<string>|undefined)
+ * }}
+ * @see https://w3c.github.io/encrypted-media/#mediakeysystemconfiguration-dictionary
+ */
+var MediaKeySystemConfiguration;
+
+
+/**
+ * @param {string} keySystem
+ * @param {!Array<!MediaKeySystemConfiguration>} supportedConfigurations
+ * @return {!Promise<!MediaKeySystemAccess>}
+ * @see https://w3c.github.io/encrypted-media/#navigator-extension-requestmediakeysystemaccess
+ */
+Navigator.prototype.requestMediaKeySystemAccess =
+    function(keySystem, supportedConfigurations) {};
+
+
+/** @const {MediaKeys} */
+HTMLMediaElement.prototype.mediaKeys;
+
+
+/**
+ * @param {MediaKeys} mediaKeys
+ * @return {!Promise}
+ * @see https://w3c.github.io/encrypted-media/#dom-htmlmediaelement-setmediakeys
+ */
+HTMLMediaElement.prototype.setMediaKeys = function(mediaKeys) {};
+
+
+
+/**
+ * @interface
+ * @see https://w3c.github.io/encrypted-media/#mediakeysystemaccess-interface
+ */
+function MediaKeySystemAccess() {}
+
+
+/** @return {!Promise<!MediaKeys>} */
+MediaKeySystemAccess.prototype.createMediaKeys = function() {};
+
+
+/** @return {!MediaKeySystemConfiguration} */
+MediaKeySystemAccess.prototype.getConfiguration = function() {};
+
+
+/** @const {string} */
+MediaKeySystemAccess.prototype.keySystem;
+
+
+
+/**
+ * @interface
+ * @see https://w3c.github.io/encrypted-media/#mediakeys-interface
+ */
+function MediaKeys() {}
+
+
+/**
+ * @param {string=} opt_sessionType defaults to "temporary"
+ * @return {!MediaKeySession}
+ * @throws {TypeError} if opt_sessionType is invalid.
+ */
+MediaKeys.prototype.createSession = function(opt_sessionType) {};
+
+
+/**
+ * @param {!BufferSource} serverCertificate
+ * @return {!Promise}
+ */
+MediaKeys.prototype.setServerCertificate = function(serverCertificate) {};
+
+
+
+/**
+ * @interface
+ * @see https://w3c.github.io/encrypted-media/#mediakeystatusmap-interface
+ */
+function MediaKeyStatusMap() {}
+
+
+/** @const {number} */
+MediaKeyStatusMap.prototype.size;
+
+
+/**
+ * Array entry 0 is the key, 1 is the value.
+ * @return {!Iterator<!Array<!BufferSource|string>>}
+ */
+MediaKeyStatusMap.prototype.entries = function() {};
+
+
+/**
+ * The function is called with each value.
+ * @param {function(string, !BufferSource)} callback A callback function to run for
+ *     each media key. The first parameter is the key status; the second
+ *     parameter is the key ID.
+ * @return {undefined}
+ */
+MediaKeyStatusMap.prototype.forEach = function(callback) {};
+
+
+/**
+ * @param {!BufferSource} keyId
+ * @return {string|undefined}
+ */
+MediaKeyStatusMap.prototype.get = function(keyId) {};
+
+
+/**
+ * @param {!BufferSource} keyId
+ * @return {boolean}
+ */
+MediaKeyStatusMap.prototype.has = function(keyId) {};
+
+
+/**
+ * @return {!Iterator<!BufferSource>}
+ */
+MediaKeyStatusMap.prototype.keys = function() {};
+
+
+/**
+ * @return {!Iterator<string>}
+ */
+MediaKeyStatusMap.prototype.values = function() {};
+
+
+
+/**
+ * @interface
+ * @extends {EventTarget}
+ * @see https://w3c.github.io/encrypted-media/#mediakeysession-interface
+ */
+function MediaKeySession() {}
+
+
+/** @const {string} */
+MediaKeySession.prototype.sessionId;
+
+
+/** @const {number} */
+MediaKeySession.prototype.expiration;
+
+
+/** @const {!Promise} */
+MediaKeySession.prototype.closed;
+
+
+/** @const {!MediaKeyStatusMap} */
+MediaKeySession.prototype.keyStatuses;
+
+
+/**
+ * @param {string} initDataType
+ * @param {!BufferSource} initData
+ * @return {!Promise}
+ */
+MediaKeySession.prototype.generateRequest = function(initDataType, initData) {};
+
+
+/**
+ * @param {string} sessionId
+ * @return {!Promise<boolean>}}
+ */
+MediaKeySession.prototype.load = function(sessionId) {};
+
+
+/**
+ * @param {!BufferSource} response
+ * @return {!Promise}
+ */
+MediaKeySession.prototype.update = function(response) {};
+
+
+/** @return {!Promise} */
+MediaKeySession.prototype.close = function() {};
+
+
+/** @return {!Promise} */
+MediaKeySession.prototype.remove = function() {};
+
+
+/** @override */
+MediaKeySession.prototype.addEventListener = function(
+    type, listener, opt_options) {};
+
+
+/** @override */
+MediaKeySession.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+
+/** @override */
+MediaKeySession.prototype.dispatchEvent = function(evt) {};
+
+/**
+ * @record
+ * @extends {EventInit}
+ * @see https://w3c.github.io/encrypted-media/#dom-mediakeymessageeventinit
+ */
+function MediaKeyMessageEventInit() {};
+
+/** @type {string} */
+MediaKeyMessageEventInit.prototype.messageType;
+
+/** @type {!ArrayBuffer} */
+MediaKeyMessageEventInit.prototype.message;
+
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {MediaKeyMessageEventInit} eventInitDict
+ * @extends {Event}
+ * @see https://w3c.github.io/encrypted-media/#mediakeymessageevent
+ */
+function MediaKeyMessageEvent(type, eventInitDict) {}
+
+
+/** @const {string} */
+MediaKeyMessageEvent.prototype.messageType;
+
+
+/** @const {!ArrayBuffer} */
+MediaKeyMessageEvent.prototype.message;
+
+
+/** @const {!MediaKeySession} */
+MediaKeyMessageEvent.prototype.target;
+
+/**
+ * @record
+ * @extends {EventInit}
+ * @see https://w3c.github.io/encrypted-media/#dom-mediaencryptedeventinit
+ */
+function MediaEncryptedEventInit() {};
+
+/** @type {(string | undefined)} */
+MediaEncryptedEventInit.prototype.initDataType;
+
+/** @type {(ArrayBuffer | undefined)} */
+MediaEncryptedEventInit.prototype.initData;
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {MediaEncryptedEventInit=} opt_eventInitDict
+ * @extends {Event}
+ * @see https://w3c.github.io/encrypted-media/#mediaencryptedevent
+ */
+function MediaEncryptedEvent(type, opt_eventInitDict) {}
+
+
+/** @const {string} */
+MediaEncryptedEvent.prototype.initDataType;
+
+
+/** @const {ArrayBuffer} */
+MediaEncryptedEvent.prototype.initData;
+
+
+/** @const {!HTMLMediaElement} */
+MediaEncryptedEvent.prototype.target;
+
--- a/javascript/externs/web/mediasource.js
+++ b/javascript/externs/web/mediasource.js
@@ -27,26 +27,15 @@
 */
 function MediaSource() {}

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-MediaSource.prototype.addEventListener = function(
-    type, listener, opt_useCapture) {};
+/** @override */
+MediaSource.prototype.addEventListener = function(type, listener, opt_options) {
+};

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
+/** @override */
 MediaSource.prototype.removeEventListener = function(
-    type, listener, opt_useCapture) {};
+    type, listener, opt_options) {};

-/**
- * @override
- * @return {boolean}
- */
+/** @override */
 MediaSource.prototype.dispatchEvent = function(evt) {};

 /** @type {Array<SourceBuffer>} */
@@ -105,26 +94,15 @@ MediaSource.isTypeSupported = function(type) {};
 */
 function SourceBuffer() {}

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
+/** @override */
 SourceBuffer.prototype.addEventListener = function(
-    type, listener, opt_useCapture) {};
+    type, listener, opt_options) {};

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
+/** @override */
 SourceBuffer.prototype.removeEventListener = function(
-    type, listener, opt_useCapture) {};
+    type, listener, opt_options) {};

-/**
- * @override
- * @return {boolean}
- */
+/** @override */
 SourceBuffer.prototype.dispatchEvent = function(evt) {};

 /** @type {string} */
@@ -169,3 +147,9 @@ SourceBuffer.prototype.abort = function() {};
 * @return {undefined}
 */
 SourceBuffer.prototype.remove = function(start, end) {};
+
+/**
+ * @param {string} type
+ * @return {undefined}
+ */
+SourceBuffer.prototype.changeType = function(type) {};
--- a/javascript/externs/web/nonstandard_anim_timing.js
+++ b/javascript/externs/web/nonstandard_anim_timing.js
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2011 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview Nonstandard definitions for timing control for script base animations.
+ *
+ * @externs
+ */
+
+/**
+ * @param {!FrameRequestCallback} callback
+ * @param {Element=} opt_element
+ * @return {number}
+ */
+function webkitRequestAnimationFrame(callback, opt_element) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function webkitCancelRequestAnimationFrame(handle) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function webkitCancelAnimationFrame(handle) {};
+
+/**
+ * @param {?FrameRequestCallback} callback It's legitimate to pass a null
+ *     callback and listen on the MozBeforePaint event instead.
+ * @param {Element=} opt_element
+ * @return {number}
+ */
+function mozRequestAnimationFrame(callback, opt_element) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function mozCancelRequestAnimationFrame(handle) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function mozCancelAnimationFrame(handle) {};
+
+/**
+ * @param {!FrameRequestCallback} callback
+ * @param {Element=} opt_element
+ * @return {number}
+ */
+function msRequestAnimationFrame(callback, opt_element) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function msCancelRequestAnimationFrame(handle) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function msCancelAnimationFrame(handle) {};
+
+/**
+ * @param {!FrameRequestCallback} callback
+ * @param {Element=} opt_element
+ * @return {number}
+ */
+function oRequestAnimationFrame(callback, opt_element) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function oCancelRequestAnimationFrame(handle) {};
+
+/**
+ * @param {number} handle
+ * @return {undefined}
+ */
+function oCancelAnimationFrame(handle) {};
--- a/javascript/externs/web/nonstandard_audio.js
+++ b/javascript/externs/web/nonstandard_audio.js
@@ -0,0 +1,82 @@
+/*
+ * Copyright 2012 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Nonstandard definitions for the API related to audio.
+ *
+ * @externs
+ */
+
+/**
+ * Definitions for the Web Audio API with webkit prefix.
+ */
+
+/**
+ * @constructor
+ * @extends {AudioContext}
+ */
+function webkitAudioContext() {}
+
+/**
+ * @param {number} numberOfChannels
+ * @param {number} length
+ * @param {number} sampleRate
+ * @constructor
+ * @extends {OfflineAudioContext}
+ */
+function webkitOfflineAudioContext(numberOfChannels, length, sampleRate) {}
+
+/**
+ * @constructor
+ * @extends {AudioPannerNode}
+ */
+function webkitAudioPannerNode() {}
+
+/**
+ * @constructor
+ * @extends {PannerNode}
+ */
+function webkitPannerNode() {}
+
+/**
+ * Definitions for the Audio API as implemented in Firefox.
+ *   Please note that this document describes a non-standard experimental API.
+ *   This API is considered deprecated.
+ * @see https://developer.mozilla.org/en/DOM/HTMLAudioElement
+ */
+
+/**
+ * @param {string=} src
+ * @constructor
+ * @extends {HTMLAudioElement}
+ */
+function Audio(src) {}
+
+/**
+ * @param {number} channels
+ * @param {number} rate
+ */
+Audio.prototype.mozSetup = function(channels, rate) {};
+
+/**
+ * @param {Array|Float32Array} buffer
+ */
+Audio.prototype.mozWriteAudio = function(buffer) {};
+
+/**
+ * @return {number}
+ */
+Audio.prototype.mozCurrentSampleOffset = function() {};
--- a/javascript/externs/web/nonstandard_console.js
+++ b/javascript/externs/web/nonstandard_console.js
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2019 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for console debugging facilities implemented in
+ *     various browsers but not part of https://console.spec.whatwg.org/.
+ * @externs
+ */
+
+/**
+ * @constructor
+ * @see https://cs.chromium.org/search/?q=%22interface+MemoryInfo%22+file:idl+file:WebKit+package:chromium&type=cs
+ */
+function MemoryInfo() {};
+
+/** @type {number} */
+MemoryInfo.prototype.totalJSHeapSize;
+
+/** @type {number} */
+MemoryInfo.prototype.usedJSHeapSize;
+
+/** @type {number} */
+MemoryInfo.prototype.jsHeapSizeLimit;
+
+/**
+ * @param {*} value
+ * @return {undefined}
+ */
+Console.prototype.markTimeline = function(value) {};
+
+/**
+ * @param {string=} title
+ * @return {undefined}
+ */
+Console.prototype.profile = function(title) {};
+
+/** @type {Array<ScriptProfile>} */
+Console.prototype.profiles;
+
+/**
+ * @param {string=} title
+ * @return {undefined}
+ */
+Console.prototype.profileEnd = function(title) {};
+
+/**
+ * @param {*} value
+ * @return {undefined}
+ */
+Console.prototype.timeStamp = function(value) {};
+
+/** @type {MemoryInfo} */
+Console.prototype.memory;
--- a/javascript/externs/web/nonstandard_fileapi.js
+++ b/javascript/externs/web/nonstandard_fileapi.js
--- a/javascript/externs/web/nonstandard_indexeddb.js
+++ b/javascript/externs/web/nonstandard_indexeddb.js
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2011 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Browser specific definitions for W3C's IndexedDB API
+ * @externs
+ */
+
+/** @type {!IDBFactory|undefined} */
+Window.prototype.moz_indexedDB;
+
+/** @type {!IDBFactory|undefined} */
+Window.prototype.mozIndexedDB;
+
+/** @type {!IDBFactory|undefined} */
+Window.prototype.webkitIndexedDB;
+
+/** @type {!IDBFactory|undefined} */
+Window.prototype.msIndexedDB;
+
+/**
+ * @constructor
+ * @extends {IDBRequest}
+ * @see http://www.w3.org/TR/IndexedDB/#idl-def-IDBRequest
+ * @see https://www.w3.org/TR/IndexedDB-2/#request-api
+ */
+function webkitIDBRequest() {}
+
+/**
+ * @constructor
+ * @extends {IDBCursor}
+ * @see http://www.w3.org/TR/IndexedDB/#idl-def-IDBCursor
+ * @see https://www.w3.org/TR/IndexedDB-2/#cursor-interface
+ */
+function webkitIDBCursor() {}
+
+/**
+ * @constructor
+ * @extends {IDBTransaction}
+ * @see http://www.w3.org/TR/IndexedDB/#idl-def-IDBTransaction
+ * @see https://www.w3.org/TR/IndexedDB-2/#transaction
+ */
+function webkitIDBTransaction() {}
+
+/**
+ * @constructor
+ * @extends {IDBKeyRange}
+ * @see http://www.w3.org/TR/IndexedDB/#idl-def-IDBKeyRange
+ * @see https://www.w3.org/TR/IndexedDB-2/#keyrange
+ */
+function webkitIDBKeyRange() {}
+
+/**
+ * @param {string} type
+ * @param {!IDBVersionChangeEventInit=} eventInit
+ * @constructor
+ * @extends {IDBVersionChangeEvent}
+ * @see http://www.w3.org/TR/IndexedDB/#idl-def-IDBVersionChangeEvent
+ */
+function webkitIDBVersionChangeEvent(type, eventInit) {}
+
+/**
+ * @const {string}
+ */
+webkitIDBVersionChangeEvent.prototype.version;
--- a/javascript/externs/web/nonstandard_navigation_timing.js
+++ b/javascript/externs/web/nonstandard_navigation_timing.js
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2011 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Nonstandard Definitions for W3C's Navigation Timing
+ * specification.
+ *
+ * @externs
+ */
+
+// Nonstandard. Only available in Blink.
+// Returns more granular results with the --enable-memory-info flag.
+/** @type {MemoryInfo} */ Performance.prototype.memory;
+
+/**
+ * Clear out the buffer of performance timing events for webkit browsers.
+ * @return {undefined}
+ */
+Performance.prototype.webkitClearResourceTimings = function() {};
+
+/**
+ * @return {number}
+ * @nosideeffects
+ */
+Performance.prototype.webkitNow = function() {};
--- a/javascript/externs/web/nonstandard_rtc.js
+++ b/javascript/externs/web/nonstandard_rtc.js
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2019 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Nonstandard definitions for components of the WebRTC browser
+ * API.
+ *
+ * @externs
+ */
+
+/**
+ * @type {function(new: MediaStream,
+ *                 (!MediaStream|!Array<!MediaStreamTrack>)=)}
+ */
+var webkitMediaStream;
+
+/**
+ * @param {MediaStreamConstraints} constraints A MediaStreamConstraints object.
+ * @param {function(!MediaStream)} successCallback
+ *     A NavigatorUserMediaSuccessCallback function.
+ * @param {function(!NavigatorUserMediaError)=} errorCallback A
+ *     NavigatorUserMediaErrorCallback function.
+ * @see http://dev.w3.org/2011/webrtc/editor/getusermedia.html
+ * @see https://www.w3.org/TR/mediacapture-streams/
+ * @return {undefined}
+ */
+Navigator.prototype.webkitGetUserMedia = function(
+    constraints, successCallback, errorCallback) {};
+
+/** @const */
+var webkitRTCPeerConnection = RTCPeerConnection;
--- a/javascript/externs/web/nonstandard_selection.js
+++ b/javascript/externs/web/nonstandard_selection.js
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2011 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Nonstandard enhancements to W3C's Selection API.
+ *
+ * @externs
+ */
+
+// The following were sources from the webkit externs.
+
+/** @type {?Node} */
+Selection.prototype.baseNode;
+
+/** @type {number} */
+Selection.prototype.baseOffset;
+
+/** @type {?Node} */
+Selection.prototype.extentNode;
+
+/** @type {number} */
+Selection.prototype.extentOffset;
+
+/**
+ * @param {string} alter
+ * @param {string} direction
+ * @param {string} granularity
+ * @return {undefined}
+ */
+Selection.prototype.modify = function(alter, direction, granularity) {};
+
+
+// The following were sources from the gecko externs.
+
+
+/**
+ * @see https://developer.mozilla.org/en/DOM/Selection/selectionLanguageChange
+ */
+Selection.prototype.selectionLanguageChange;
+
+
+// The following were sources from the ie externs.
+
+
+/**
+ * @type {?Selection}
+ * @see http://msdn.microsoft.com/en-us/library/ms535869(VS.85).aspx
+ */
+Document.prototype.selection;
+
+/**
+ * @return {undefined}
+ * @see http://msdn.microsoft.com/en-us/library/ms536418(VS.85).aspx
+ */
+Selection.prototype.clear = function() {};
+
+/**
+ * @return {?TextRange|?ControlRange}
+ * @see http://msdn.microsoft.com/en-us/library/ms536394(VS.85).aspx
+ */
+Selection.prototype.createRange = function() {};
+
+/**
+ * @return {?Array<?TextRange>}
+ * @see http://msdn.microsoft.com/en-us/library/ms536396(VS.85).aspx
+ */
+Selection.prototype.createRangeCollection = function() {};
--- a/javascript/externs/web/streamsapi.js
+++ b/javascript/externs/web/streamsapi.js
@@ -24,31 +24,117 @@
 */


-/** @typedef {{ value:*, done:boolean }} */
-var IteratorResult;
-
-
 /**
 * @typedef {!CountQueuingStrategy|!ByteLengthQueuingStrategy|{
 *     size: (undefined|function(*): number),
- *     highWaterMark: number
+ *     highWaterMark: (number|undefined),
 * }}
 */
 var QueuingStrategy;

+/**
+ * The TransformStreamDefaultController class has methods that allow
+ * manipulation of the associated ReadableStream and WritableStream.
+ *
+ * This class cannot be directly constructed and is instead passed by the
+ * TransformStream to the methods of its transformer.
+ *
+ * @interface
+ * @template OUT_VALUE
+ * @see https://streams.spec.whatwg.org/#ts-default-controller-class
+ */
+function TransformStreamDefaultController() {};
+
+/**
+ * @type {number}
+ * @see https://streams.spec.whatwg.org/#ts-default-controller-desired-size
+ */
+TransformStreamDefaultController.prototype.desiredSize;
+
+/**
+ * @param {OUT_VALUE} chunk
+ * @return {undefined}
+ * @see https://streams.spec.whatwg.org/#ts-default-controller-enqueue
+ */
+TransformStreamDefaultController.prototype.enqueue = function(chunk) {};
+
+/**
+ * @param {*} reason
+ * @return {undefined}
+ * @see https://streams.spec.whatwg.org/#ts-default-controller-error
+ */
+TransformStreamDefaultController.prototype.error = function(reason) {};
+
+/**
+ * @return {undefined}
+ * @see https://streams.spec.whatwg.org/#ts-default-controller-terminate
+ */
+TransformStreamDefaultController.prototype.terminate = function() {};
+

 /**
 * @record
+ * @template IN_VALUE, OUT_VALUE
+ * @see https://streams.spec.whatwg.org/#transformer-api
 */
-function TransformStream() {};
+function TransformStreamTransformer() {};

-/** @type {!WritableStream} */
+/**
+ * @type {(undefined|function(
+ *     !TransformStreamDefaultController<OUT_VALUE>
+ *   ):(!IThenable<*>|undefined)
+ * )}
+ */
+TransformStreamTransformer.prototype.start;
+
+/**
+ * @type {(undefined|function(
+ *     IN_VALUE, !TransformStreamDefaultController<OUT_VALUE>
+ *   ):(!IThenable<*>|undefined)
+ * )}
+ */
+TransformStreamTransformer.prototype.transform;
+
+/**
+ * @type {(undefined|function(
+ *     !TransformStreamDefaultController<OUT_VALUE>
+ *   ):(!IThenable<*>|undefined)
+ * )}
+ */
+TransformStreamTransformer.prototype.flush;
+
+
+/**
+ * A transform stream (https://streams.spec.whatwg.org/#transform-stream).
+ * @record
+ * @template IN_VALUE, OUT_VALUE
+ */
+function ITransformStream() {}
+
+/** @type {!WritableStream<IN_VALUE>} */
+ITransformStream.prototype.writable;
+
+/** @type {!ReadableStream<OUT_VALUE>} */
+ITransformStream.prototype.readable;
+
+
+/**
+ * @constructor
+ * @implements {ITransformStream<IN_VALUE, OUT_VALUE>}
+ * @template IN_VALUE, OUT_VALUE
+ * @param {!TransformStreamTransformer<IN_VALUE, OUT_VALUE>=} transformer
+ * @param {!QueuingStrategy=} writableStrategy
+ * @param {!QueuingStrategy=} readableStrategy
+ * @see https://streams.spec.whatwg.org/#ts-class
+ */
+function TransformStream(transformer, writableStrategy, readableStrategy) {};
+
+/** @type {!WritableStream<IN_VALUE>} */
 TransformStream.prototype.writable;

-/** @type {!ReadableStream} */
+/** @type {!ReadableStream<OUT_VALUE>} */
 TransformStream.prototype.readable;

-
 /**
 * @record
 */
@@ -66,18 +152,23 @@ PipeOptions.prototype.preventCancel;

 /**
 * @record
+ * @template VALUE
 */
 function ReadableStreamSource() {};

 /**
- * @type {(undefined|
- *     function((!ReadableByteStreamController|!ReadableStreamDefaultController)):(!IThenable<*>|undefined))}
+ * @type {(undefined|function(
+ *     (!ReadableByteStreamController|!ReadableStreamDefaultController<VALUE>)
+ *   ):(!IThenable<*>|undefined)
+ * )}
 */
 ReadableStreamSource.prototype.start;

 /**
- * @type {(undefined|
- *     function((!ReadableByteStreamController|!ReadableStreamDefaultController)):(!IThenable<*>|undefined))}
+ * @type {(undefined|function(
+ *     (!ReadableByteStreamController|!ReadableStreamDefaultController<VALUE>)
+ *   ):(!IThenable<*>|undefined)
+ * )}
 */
 ReadableStreamSource.prototype.pull;

@@ -90,11 +181,19 @@ ReadableStreamSource.prototype.type;
 /** @type {(undefined|number)} */
 ReadableStreamSource.prototype.autoAllocateChunkSize;

+/**
+ * @record
+ */
+function ReadableStreamIteratorOptions() {};
+
+/** @type {undefined|boolean} */
+ReadableStreamIteratorOptions.prototype.preventCancel;

 /**
- * @param {!ReadableStreamSource=} opt_underlyingSource
- * @param {!QueuingStrategy=} opt_queuingStrategy
 * @constructor
+ * @template VALUE
+ * @param {!ReadableStreamSource<VALUE>=} opt_underlyingSource
+ * @param {!QueuingStrategy<VALUE>=} opt_queuingStrategy
 * @see https://streams.spec.whatwg.org/#rs-class
 */
 function ReadableStream(opt_underlyingSource, opt_queuingStrategy) {};
@@ -112,23 +211,31 @@ ReadableStream.prototype.locked;
 */
 ReadableStream.prototype.cancel = function(reason) {};

+/**
+ * @param {!ReadableStreamIteratorOptions=} options
+ * @return {!AsyncIterator}
+ * @see https://streams.spec.whatwg.org/#rs-get-iterator
+ */
+ReadableStream.prototype.getIterator = function(options) {};
+
 /**
 * @param {{ mode:(undefined|string) }=} opt_options
- * @return {(!ReadableStreamDefaultReader|!ReadableStreamBYOBReader)}
+ * @return {(!ReadableStreamDefaultReader<VALUE>|!ReadableStreamBYOBReader)}
 * @see https://streams.spec.whatwg.org/#rs-get-reader
 */
 ReadableStream.prototype.getReader = function(opt_options) {};

 /**
- * @param {!TransformStream} transform
+ * @template PIPE_VALUE
+ * @param {!ITransformStream<PIPE_VALUE, VALUE>} transform
 * @param {!PipeOptions=} opt_options
- * @return {!ReadableStream}
+ * @return {!ReadableStream<PIPE_VALUE>}
 * @see https://streams.spec.whatwg.org/#rs-pipe-through
 */
 ReadableStream.prototype.pipeThrough = function(transform, opt_options) {};

 /**
- * @param {!WritableStream} dest
+ * @param {!WritableStream<VALUE>} dest
 * @param {!PipeOptions=} opt_options
 * @return {!Promise<void>}
 * @see https://streams.spec.whatwg.org/#rs-pipe-to
@@ -136,17 +243,24 @@ ReadableStream.prototype.pipeThrough = function(transform, opt_options) {};
 ReadableStream.prototype.pipeTo = function(dest, opt_options) {};

 /**
- * @return {!Array<!ReadableStream>}
+ * @return {!Array<!ReadableStream<VALUE>>}
 * @see https://streams.spec.whatwg.org/#rs-tee
 */
 ReadableStream.prototype.tee = function() {};

+/**
+ * @param {!ReadableStreamIteratorOptions=} options
+ * @return {!AsyncIterator}
+ * @see https://streams.spec.whatwg.org/#rs-asynciterator
+ */
+ReadableStream.prototype[Symbol.asyncIterator] = function(options) {};

 /**
- * The ReadableStreamDefaultReader constructor is generally not meant to be used directly;
- * instead, a stream’s getReader() method should be used.
+ * The ReadableStreamDefaultReader constructor is generally not meant to be used
+ * directly; instead, a stream’s getReader() method should be used.
 *
 * @interface
+ * @template VALUE
 * @see https://streams.spec.whatwg.org/#default-reader-class
 */
 function ReadableStreamDefaultReader() {};
@@ -165,7 +279,7 @@ ReadableStreamDefaultReader.prototype.closed;
 ReadableStreamDefaultReader.prototype.cancel = function(reason) {};

 /**
- * @return {!Promise<!IteratorResult>}
+ * @return {!Promise<!IIterableResult<VALUE>>}
 * @see https://streams.spec.whatwg.org/#default-reader-read
 */
 ReadableStreamDefaultReader.prototype.read = function() {};
@@ -200,8 +314,9 @@ ReadableStreamBYOBReader.prototype.closed;
 ReadableStreamBYOBReader.prototype.cancel = function(reason) {};

 /**
- * @param {!ArrayBufferView} view
- * @return {!Promise<!IteratorResult>}
+ * @template BUFFER
+ * @param {BUFFER} view
+ * @return {!Promise<!IIterableResult<BUFFER>>}
 * @see https://streams.spec.whatwg.org/#byob-reader-read
 */
 ReadableStreamBYOBReader.prototype.read = function(view) {};
@@ -218,6 +333,7 @@ ReadableStreamBYOBReader.prototype.releaseLock = function() {};
 * it only works on a ReadableStream that is in the middle of being constructed.
 *
 * @interface
+ * @template VALUE
 * @see https://streams.spec.whatwg.org/#rs-default-controller-class
 */
 function ReadableStreamDefaultController() {};
@@ -235,7 +351,7 @@ ReadableStreamDefaultController.prototype.desiredSize;
 ReadableStreamDefaultController.prototype.close = function() {};

 /**
- * @param {*} chunk
+ * @param {VALUE} chunk
 * @return {undefined}
 * @see https://streams.spec.whatwg.org/#rs-default-controller-enqueue
 */
@@ -320,13 +436,17 @@ ReadableStreamBYOBRequest.prototype.respondWithNewView = function(view) {};

 /**
 * @record
+ * @template VALUE
 */
 function WritableStreamSink() {};

 /** @type {(undefined|function(!WritableStreamDefaultController):(!IThenable<*>|undefined))}*/
 WritableStreamSink.prototype.start;

-/** @type {(undefined|function(!WritableStreamDefaultController):(!IThenable<*>|undefined))}*/
+/**
+ * @type {(undefined|function(VALUE,
+ *     !WritableStreamDefaultController):(!IThenable<*>|undefined))}
+ */
 WritableStreamSink.prototype.write;

 /** @type {(undefined|function():(!IThenable<*>|undefined))} */
@@ -337,9 +457,10 @@ WritableStreamSink.prototype.abort;


 /**
- * @param {!WritableStreamSink=} opt_underlyingSink
- * @param {!QueuingStrategy=} opt_queuingStrategy
 * @constructor
+ * @template VALUE
+ * @param {!WritableStreamSink<VALUE>=} opt_underlyingSink
+ * @param {!QueuingStrategy<VALUE>=} opt_queuingStrategy
 * @see https://streams.spec.whatwg.org/#ws-class
 */
 function WritableStream(opt_underlyingSink, opt_queuingStrategy) {};
@@ -358,7 +479,13 @@ WritableStream.prototype.locked;
 WritableStream.prototype.abort = function(reason) {};

 /**
- * @return {!WritableStreamDefaultWriter}
+ * @return {!Promise<undefined>}
+ * @see https://streams.spec.whatwg.org/#ws-close
+ */
+WritableStream.prototype.close = function() {};
+
+/**
+ * @return {!WritableStreamDefaultWriter<VALUE>}
 * @see https://streams.spec.whatwg.org/#ws-get-writer
 */
 WritableStream.prototype.getWriter = function() {};
@@ -366,6 +493,7 @@ WritableStream.prototype.getWriter = function() {};

 /**
 * @interface
+ * @template VALUE
 * @see https://streams.spec.whatwg.org/#default-writer-class
 */
 function WritableStreamDefaultWriter() {};
@@ -408,7 +536,7 @@ WritableStreamDefaultWriter.prototype.close = function() {};
 WritableStreamDefaultWriter.prototype.releaseLock = function() {};

 /**
- * @param {*} chunk
+ * @param {VALUE} chunk
 * @return {!Promise<undefined>}
 * @see https://streams.spec.whatwg.org/#default-writer-write
 */
--- a/javascript/externs/web/url.js
+++ b/javascript/externs/web/url.js
@@ -23,9 +23,32 @@
 */

 /**
+ * @typedef {Array<string>}
+ */
+var URLSearchParamsTupleType;
+
+/**
+ * Represents the query string of a URL.
+ *
+ * * When `init` is a string, it is basically parsed as a query string
+ *   `'name1=value1&name2=value2'`.
+ *
+ * * When `init` is an array of arrays of string
+ *   `([['name1', 'value1'], ['name2', 'value2']])`,
+ *   it must contain pairs of strings, where the first item in the pair will be
+ *   interpreted as a key and the second as a value.
+ *
+ *   NOTE: The specification uses Iterable rather than Array, but this is not
+ *   supported in Edge 17 - 18.
+ *
+ * * When `init` is an object, keys and values will be interpreted as such
+ *   `({name1: 'value1', name2: 'value2'}).
+ *
+ * @see https://url.spec.whatwg.org/#interface-urlsearchparams
 * @constructor
 * @implements {Iterable<!Array<string>>}
- * @param {(string|!URLSearchParams)=} init
+ * @param {(string|!Array<!URLSearchParamsTupleType>|!Object<string,string>)=}
+ *     init
 */
 function URLSearchParams(init) {}

@@ -42,6 +65,19 @@ URLSearchParams.prototype.append = function(name, value) {};
 */
 URLSearchParams.prototype.delete = function(name) {};

+/**
+ * @return {!IteratorIterable<!Array<string>>}
+ * @nosideeffects
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams/entries
+ */
+URLSearchParams.prototype.entries = function() {};
+
+/**
+ * @param {function(string, string)} callback
+ * @return {undefined}
+ */
+URLSearchParams.prototype.forEach = function(callback) {};
+
 /**
 * @param {string} name
 * @return {?string}
@@ -60,6 +96,12 @@ URLSearchParams.prototype.getAll = function(name) {};
 */
 URLSearchParams.prototype.has = function(name) {};

+/**
+ * @return {!IteratorIterable<string>}
+ */
+URLSearchParams.prototype.keys = function() {};
+
+
 /**
 * @param {string} name
 * @param {string} value
@@ -67,6 +109,16 @@ URLSearchParams.prototype.has = function(name) {};
 */
 URLSearchParams.prototype.set = function(name, value) {};

+/**
+ * @return {undefined}
+ */
+URLSearchParams.prototype.sort = function() {};
+
+/**
+ * @return {!IteratorIterable<string>}
+ */
+URLSearchParams.prototype.values = function() {};
+
 /**
 * @see https://url.spec.whatwg.org
 * @constructor
@@ -79,8 +131,7 @@ function URL(url, base) {}
 URL.prototype.href;

 /**
- * @const
- * @type {string}
+ * @const {string}
 */
 URL.prototype.origin;

@@ -109,8 +160,7 @@ URL.prototype.pathname;
 URL.prototype.search;

 /**
- * @const
- * @type {URLSearchParams}
+ * @const {!URLSearchParams}
 */
 URL.prototype.searchParams;

--- a/javascript/externs/web/w3c_abort.js
+++ b/javascript/externs/web/w3c_abort.js
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for AbortController
+ * @see https://dom.spec.whatwg.org/#aborting-ongoing-activities
+ * @externs
+ */
+
+
+
+/**
+ * @record
+ * @extends {EventTarget}
+ * @see https://dom.spec.whatwg.org/#interface-AbortSignal
+ */
+function AbortSignal() {}
+
+/** @type {boolean} */
+AbortSignal.prototype.aborted;
+
+/** @type {?function(!Event)} */
+AbortSignal.prototype.onabort;
+
+
+
+/**
+ * @constructor
+ * @see https://dom.spec.whatwg.org/#interface-abortcontroller
+ */
+function AbortController() {}
+
+/** @const {!AbortSignal} */
+AbortController.prototype.signal;
+
+/** @return {void} */
+AbortController.prototype.abort = function() {};
--- a/javascript/externs/web/w3c_anim_timing.js
+++ b/javascript/externs/web/w3c_anim_timing.js
@@ -23,7 +23,13 @@
 */

 /**
- * @param {function(number)} callback
+ * @typedef {function(number): undefined}
+ * @see https://html.spec.whatwg.org/multipage/imagebitmap-and-animations.html#framerequestcallback
+ */
+var FrameRequestCallback;
+
+/**
+ * @param {!FrameRequestCallback} callback
 * @param {Element=} opt_element In early versions of this API, the callback
 *     was invoked only if the element was visible.
 * @return {number}
@@ -41,80 +47,3 @@ function cancelRequestAnimationFrame(handle) {};
 * @return {undefined}
 */
 function cancelAnimationFrame(handle) {};
-
-/**
- * @param {function(number)} callback
- * @param {Element=} opt_element
- * @return {number}
- */
-function webkitRequestAnimationFrame(callback, opt_element) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function webkitCancelRequestAnimationFrame(handle) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function webkitCancelAnimationFrame(handle) {};
-
-/**
- * @param {?function(number)} callback It's legitimate to pass a null
- *     callback and listen on the MozBeforePaint event instead.
- * @param {Element=} opt_element
- * @return {number}
- */
-function mozRequestAnimationFrame(callback, opt_element) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function mozCancelRequestAnimationFrame(handle) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function mozCancelAnimationFrame(handle) {};
-
-/**
- * @param {function(number)} callback
- * @param {Element=} opt_element
- * @return {number}
- */
-function msRequestAnimationFrame(callback, opt_element) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function msCancelRequestAnimationFrame(handle) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function msCancelAnimationFrame(handle) {};
-
-/**
- * @param {function(number)} callback
- * @param {Element=} opt_element
- * @return {number}
- */
-function oRequestAnimationFrame(callback, opt_element) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function oCancelRequestAnimationFrame(handle) {};
-
-/**
- * @param {number} handle
- * @return {undefined}
- */
-function oCancelAnimationFrame(handle) {};
--- a/javascript/externs/web/w3c_audio.js
+++ b/javascript/externs/web/w3c_audio.js
--- a/javascript/externs/web/w3c_batterystatus.js
+++ b/javascript/externs/web/w3c_batterystatus.js
@@ -17,7 +17,7 @@
 /**
 * @fileoverview Definitions for W3C's Battery Status API.
 *  The whole file has been fully type annotated. Created from
- *  http://www.w3.org/TR/2014/CR-battery-status-20141209/
+ *  https://www.w3.org/TR/battery-status/
 *
 * @externs
 */
@@ -56,24 +56,30 @@ BatteryManager.prototype.level;


 /**
- * @type {?function(!Event)}
+ * @type {?function(!Event): void}
 */
 BatteryManager.prototype.onchargingchange;


 /**
- * @type {?function(!Event)}
+ * @type {?function(!Event): void}
 */
 BatteryManager.prototype.onchargingtimechange;


 /**
- * @type {?function(!Event)}
+ * @type {?function(!Event): void}
 */
 BatteryManager.prototype.ondischargingtimechange;


 /**
- * @type {?function(!Event)}
+ * @type {?function(!Event): void}
 */
 BatteryManager.prototype.onlevelchange;
+
+/**
+ * @return {!Promise<!BatteryManager>}
+ * @see http://www.w3.org/TR/battery-status/
+ */
+Navigator.prototype.getBattery = function() {};
--- a/javascript/externs/web/w3c_clipboard.js
+++ b/javascript/externs/web/w3c_clipboard.js
@@ -0,0 +1,40 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Declaration of the asynchronous clipboard Web API.
+ * @externs
+ */
+
+/**
+ * @interface
+ * @see https://w3c.github.io/clipboard-apis/#async-clipboard-api
+ */
+function Clipboard() {}
+
+/**
+ * @return {!Promise<string>}
+ */
+Clipboard.prototype.readText = function() {};
+
+/**
+ * @param {string} text
+ * @return {!Promise<void>}
+ */
+Clipboard.prototype.writeText = function(text) {};
+
+/** @const {!Clipboard} */
+Navigator.prototype.clipboard;
--- a/javascript/externs/web/w3c_clipboardevent.js
+++ b/javascript/externs/web/w3c_clipboardevent.js
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2015 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's ClipboardEvent API.
+ * @see http://www.w3.org/TR/clipboard-apis/
+ *
+ * @externs
+ */
+
+
+
+/**
+ * @record
+ * @extends {EventInit}
+ * @see https://www.w3.org/TR/clipboard-apis/#dfn-eventinit
+ */
+function ClipboardEventInit() {}
+
+/** @type {?DataTransfer|undefined} */
+ClipboardEventInit.prototype.clipboardData;
+
+
+/**
+ * @constructor
+ * @extends {Event}
+ * @param {string} type
+ * @param {ClipboardEventInit=} opt_eventInitDict
+ */
+function ClipboardEvent(type, opt_eventInitDict) {}
+
+
+/** @const {?DataTransfer} */
+ClipboardEvent.prototype.clipboardData;
--- a/javascript/externs/web/w3c_composition_event.js
+++ b/javascript/externs/web/w3c_composition_event.js
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Composition Events specification.
+ * @externs
+ */
+
+/**
+ * The `CompositionEvent` interface provides specific contextual information
+ * associated with Composition Events.
+ * @see https://www.w3.org/TR/uievents/#interface-compositionevent
+ * @record
+ * @extends {UIEventInit}
+ */
+function CompositionEventInit() {}
+
+/**
+ * `data` holds the value of the characters generated by an input method. This
+ * MAY be a single Unicode character or a non-empty sequence of Unicode
+ * characters. This attribute MAY be the empty string. The un-initialized value
+ * of this attribute MUST be "" (the empty string).
+ * @type {string}
+ */
+CompositionEventInit.prototype.data;
+
+/**
+ * Composition Events provide a means for inputing text in a supplementary or
+ * alternate manner than by Keyboard Events, in order to allow the use of
+ * characters that might not be commonly available on keyboard. For example,
+ * Composition Events might be used to add accents to characters despite their
+ * absence from standard US keyboards, to build up logograms of many Asian
+ * languages from their base components or categories, to select word choices
+ * from a combination of key presses on a mobile device keyboard, or to convert
+ * voice commands into text using a speech recognition processor.
+ *
+ * Conceptually, a composition session consists of one `compositionstart` event,
+ * one or more `compositionupdate` events, and one `compositionend` event, with
+ * the value of the data attribute persisting between each stage of this event
+ * chain during each session.
+ *
+ * Not all IME systems or devices expose the necessary data to the DOM, so the
+ * active composition string (the "Reading Window" or "candidate selection" menu
+ * option) might not be available through this interface, in which case the
+ * selection MAY be represented by the empty string.
+ *
+ * @see https://www.w3.org/TR/uievents/#events-compositionevents
+ * @param {string} type
+ * @param {!CompositionEventInit=} opt_eventInitDict
+ * @extends {UIEvent}
+ * @constructor
+ */
+function CompositionEvent(type, opt_eventInitDict) {}
+
+/**
+ * Initializes attributes of a `CompositionEvent` object. This method has the
+ * same behavior as `UIEvent.initUIEvent()`. The value of `detail` remains
+ * undefined.
+ *
+ * @see https://www.w3.org/TR/uievents/#idl-interface-CompositionEvent-initializers
+ * @param {string} typeArg
+ * @param {boolean} canBubbleArg
+ * @param {boolean} cancelableArg
+ * @param {?Window} viewArg
+ * @param {string} dataArg
+ * @param {string} localeArg
+ * @return {undefined}
+ */
+CompositionEvent.prototype.initCompositionEvent = function(
+    typeArg, canBubbleArg, cancelableArg, viewArg, dataArg, localeArg) {};
+
+/**
+ * @type {string}
+ */
+CompositionEvent.prototype.data;
+
+/**
+ * @type {string}
+ */
+CompositionEvent.prototype.locale;
--- a/javascript/externs/web/w3c_css.js
+++ b/javascript/externs/web/w3c_css.js
@@ -236,52 +236,52 @@ CSSRule.prototype.style;

 /**
 * Indicates that the rule is a {@see CSSUnknownRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.UNKNOWN_RULE = 0;
+CSSRule.UNKNOWN_RULE;

 /**
 * Indicates that the rule is a {@see CSSStyleRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.STYLE_RULE = 1;
+CSSRule.STYLE_RULE;

 /**
 * Indicates that the rule is a {@see CSSCharsetRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.CHARSET_RULE = 2;
+CSSRule.CHARSET_RULE;

 /**
 * Indicates that the rule is a {@see CSSImportRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.IMPORT_RULE = 3;
+CSSRule.IMPORT_RULE;

 /**
 * Indicates that the rule is a {@see CSSMediaRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.MEDIA_RULE = 4;
+CSSRule.MEDIA_RULE;

 /**
 * Indicates that the rule is a {@see CSSFontFaceRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.FONT_FACE_RULE = 5;
+CSSRule.FONT_FACE_RULE;

 /**
 * Indicates that the rule is a {@see CSSPageRule}.
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSRule-ruleType
 */
-CSSRule.PAGE_RULE = 6;
+CSSRule.PAGE_RULE;

 /**
 * @constructor
@@ -418,6 +418,7 @@ function CSSUnknownRule() {}
 * @extends {CSSProperties}
 * @implements {IObject<(string|number), string>}
 * @implements {IArrayLike<string>}
+ * @implements {Iterable<string>}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSStyleDeclaration
 */
 function CSSStyleDeclaration() {}
@@ -518,6 +519,7 @@ CSSStyleDeclaration.prototype.removeAttribute =
 CSSStyleDeclaration.prototype.removeExpression = function(name) {};

 /**
+ * @deprecated
 * @param {string} name
 * @param {*} value
 * @param {number=} opt_flags
@@ -556,28 +558,28 @@ CSSValue.prototype.cssText;
 CSSValue.prototype.cssValueType;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSValue-types
 */
-CSSValue.CSS_INHERIT = 0;
+CSSValue.CSS_INHERIT;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSValue-types
 */
-CSSValue.CSS_PRIMITIVE_VALUE = 1;
+CSSValue.CSS_PRIMITIVE_VALUE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSValue-types
 */
-CSSValue.CSS_VALUE_LIST = 2;
+CSSValue.CSS_VALUE_LIST;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSValue-types
 */
-CSSValue.CSS_CUSTOM = 3;
+CSSValue.CSS_CUSTOM;

 /**
 * @constructor
@@ -593,160 +595,160 @@ function CSSPrimitiveValue() {}
 CSSPrimitiveValue.prototype.primitiveType;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_UNKNOWN = 0;
+CSSPrimitiveValue.CSS_UNKNOWN;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_NUMBER = 1;
+CSSPrimitiveValue.CSS_NUMBER;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_PERCENTAGE = 2;
+CSSPrimitiveValue.CSS_PERCENTAGE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_EMS = 3;
+CSSPrimitiveValue.CSS_EMS;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_EXS = 4;
+CSSPrimitiveValue.CSS_EXS;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_PX = 5;
+CSSPrimitiveValue.CSS_PX;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_CM = 6;
+CSSPrimitiveValue.CSS_CM;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_MM = 7;
+CSSPrimitiveValue.CSS_MM;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_IN = 8;
+CSSPrimitiveValue.CSS_IN;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_PT = 9;
+CSSPrimitiveValue.CSS_PT;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_PC = 10;
+CSSPrimitiveValue.CSS_PC;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_DEG = 11;
+CSSPrimitiveValue.CSS_DEG;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_RAD = 12;
+CSSPrimitiveValue.CSS_RAD;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_GRAD = 13;
+CSSPrimitiveValue.CSS_GRAD;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_MS = 14;
+CSSPrimitiveValue.CSS_MS;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_S = 15;
+CSSPrimitiveValue.CSS_S;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_HZ = 16;
+CSSPrimitiveValue.CSS_HZ;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_KHZ = 17;
+CSSPrimitiveValue.CSS_KHZ;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_DIMENSION = 18;
+CSSPrimitiveValue.CSS_DIMENSION;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_STRING = 19;
+CSSPrimitiveValue.CSS_STRING;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_URI = 20;
+CSSPrimitiveValue.CSS_URI;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_IDENT = 21;
+CSSPrimitiveValue.CSS_IDENT;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_ATTR = 22;
+CSSPrimitiveValue.CSS_ATTR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_COUNTER = 23;
+CSSPrimitiveValue.CSS_COUNTER;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_RECT = 24;
+CSSPrimitiveValue.CSS_RECT;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSPrimitiveValue
 */
-CSSPrimitiveValue.CSS_RGBCOLOR = 25;
+CSSPrimitiveValue.CSS_RGBCOLOR;

 /**
 * @return {Counter}
@@ -904,7 +906,7 @@ Counter.prototype.listStyle;
 Counter.prototype.separator;

 /**
- * @constructor
+ * @interface
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-ViewCSS
 */
 function ViewCSS() {}
@@ -975,6 +977,12 @@ function CSSProperties() {}
 */
 CSSProperties.prototype.azimuth;

+/**
+ * @type {string}
+ * @see https://drafts.fxtf.org/filter-effects-2/#BackdropFilterProperty
+ */
+CSSProperties.prototype.backdropFilter;
+
 /**
 * @type {string}
 * @see http://www.w3.org/TR/DOM-Level-2-Style/css.html#CSS-CSSProperties-background
@@ -1820,6 +1828,62 @@ CSSProperties.prototype.opacity;
 */
 CSSProperties.prototype.textOverflow;

+// CSS 3 animations
+
+/**
+ * @type {string|number}
+ * @see https://www.w3.org/TR/css-animations-1/#animation
+ */
+CSSProperties.prototype.animation;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-delay
+ */
+CSSProperties.prototype.animationDelay;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-direction
+ */
+CSSProperties.prototype.animationDirection;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-duration
+ */
+CSSProperties.prototype.animationDuration;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-fill-mode
+ */
+CSSProperties.prototype.animationFillMode;
+
+/**
+ * @type {string|number}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-iteration-count
+ */
+CSSProperties.prototype.animationIterationCount;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-name
+ */
+CSSProperties.prototype.animationName;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-play-state
+ */
+CSSProperties.prototype.animationPlayState;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-animations-1/#animation-timing-function
+ */
+CSSProperties.prototype.animationTimingFunction;
+
 // CSS 3 transforms

 /**
@@ -1981,6 +2045,129 @@ CSSProperties.prototype.order;
 */
 CSSProperties.prototype.willChange;

+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-ui-4/#propdef-user-select
+ */
+CSSProperties.prototype.userSelect;
+
+// CSS 3 Images
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css3-images/#the-object-fit
+ */
+CSSProperties.prototype.objectFit;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css3-images/#object-position
+ */
+CSSProperties.prototype.objectPosition;
+
+// CSS Masking
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-masking-1/
+ */
+CSSProperties.prototype.clipPath;
+
+// CSS Containment
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/css-contain-1/
+ */
+CSSProperties.prototype.contain;
+
+// SVG Fill Properties
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/fill-stroke-3/#fill-shorthand
+ */
+CSSProperties.prototype.fill;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/fill-stroke-3/#fill-opacity
+ */
+CSSProperties.prototype.fillOpacity;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/fill-stroke-3/#fill-rule
+ */
+CSSProperties.prototype.fillRule;
+
+// SVG Stroke Properties
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.stroke;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeAlignment;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeOpacity;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeWidth;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeLinecap;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeLinejoin;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeMiterlimit;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeDasharray;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeDashoffset;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeDashcorner;
+
+/**
+ * @type {string}
+ * @see https://www.w3.org/TR/svg-strokes/
+ */
+CSSProperties.prototype.strokeDashadjust;

 /**
 * TODO(dbeam): Put this in separate file named w3c_cssom.js.
@@ -1992,7 +2179,7 @@ CSSProperties.prototype.willChange;

 /**
 * @param {string} media_query_list
- * @return {MediaQueryList}
+ * @return {!MediaQueryList}
 * @see http://www.w3.org/TR/cssom-view/#dom-window-matchmedia
 */
 Window.prototype.matchMedia = function(media_query_list) {};
@@ -2034,28 +2221,53 @@ Window.prototype.scrollY;
 Window.prototype.pageYOffset;

 /**
- * @param {number} x
- * @param {number} y
+ * @typedef {{
+ *   left: (number|undefined),
+ *   top: (number|undefined),
+ *   behavior: (string|undefined)
+ * }}
+ * @see https://www.w3.org/TR/cssom-view/#dictdef-scrolltooptions
+ */
+var ScrollToOptions;
+
+/**
+ * @record
+ * @see https://www.w3.org/TR/cssom-view/#dictdef-scrollintoviewoptions
+ */
+function ScrollIntoViewOptions () {}
+
+/** @type {string|undefined} */
+ScrollIntoViewOptions.prototype.behavior;
+
+/** @type {string|undefined} */
+ScrollIntoViewOptions.prototype.block;
+
+/** @type {string|undefined} */
+ScrollIntoViewOptions.prototype.inline;
+
+/**
+ * @param {number|!ScrollToOptions} scrollToOptionsOrX
+ * @param {number=} opt_y
 * @see http://www.w3.org/TR/cssom-view/#dom-window-scroll
 * @return {undefined}
 */
-Window.prototype.scroll = function(x, y) {};
+Window.prototype.scroll = function(scrollToOptionsOrX, opt_y) {};

 /**
- * @param {number} x
- * @param {number} y
+ * @param {number|!ScrollToOptions} scrollToOptionsOrX
+ * @param {number=} opt_y
 * @see http://www.w3.org/TR/cssom-view/#dom-window-scrollto
 * @return {undefined}
 */
-Window.prototype.scrollTo = function(x, y) {};
+Window.prototype.scrollTo = function(scrollToOptionsOrX, opt_y) {};

 /**
- * @param {number} x
- * @param {number} y
+ * @param {number|!ScrollToOptions} scrollToOptionsOrX
+ * @param {number=} opt_y
 * @see http://www.w3.org/TR/cssom-view/#dom-window-scrollby
 * @return {undefined}
 */
-Window.prototype.scrollBy = function(x, y) {};
+Window.prototype.scrollBy = function(scrollToOptionsOrX, opt_y) {};

 /**
 * @type {number}
@@ -2081,8 +2293,47 @@ Window.prototype.outerWidth;
 */
 Window.prototype.outerHeight;

+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/cssom-view/#dom-window-devicepixelratio
+ */
+Window.prototype.devicePixelRatio;
+
+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {undefined}
+ * @see https://www.w3.org/TR/cssom-view/#dom-window-moveto
+ */
+Window.prototype.moveTo = function(x, y) {};
+
+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {undefined}
+ * @see https://www.w3.org/TR/cssom-view/#dom-window-moveby
+ */
+Window.prototype.moveBy = function(x, y) {};
+
+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {undefined}
+ * @see https://www.w3.org/TR/cssom-view/#dom-window-resizeto
+ */
+Window.prototype.resizeTo = function(x, y) {};
+
+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {undefined}
+ * @see https://www.w3.org/TR/cssom-view/#dom-window-resizeby
+ */
+Window.prototype.resizeBy = function(x, y) {};
+
 /**
 * @constructor
+ * @implements {EventTarget}
 * @see http://www.w3.org/TR/cssom-view/#mediaquerylist
 */
 function MediaQueryList() {}
@@ -2113,6 +2364,17 @@ MediaQueryList.prototype.addListener = function(listener) {};
 */
 MediaQueryList.prototype.removeListener = function(listener) {};

+/** @override Not available in some browsers; use addListener instead. */
+MediaQueryList.prototype.addEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override Not available in old browsers; use removeListener instead. */
+MediaQueryList.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
+MediaQueryList.prototype.dispatchEvent = function(evt) {};
+
 /**
 * @typedef {(function(!MediaQueryList) : void)}
 * @see http://www.w3.org/TR/cssom-view/#mediaquerylistlistener
@@ -2172,6 +2434,14 @@ Screen.prototype.pixelDepth;
 */
 Document.prototype.elementFromPoint = function(x, y) {};

+/**
+ * @param {number} x
+ * @param {number} y
+ * @return {!IArrayLike<!Element>}
+ * @see http://www.w3.org/TR/cssom-view/#dom-document-elementsfrompoint
+ */
+Document.prototype.elementsFromPoint = function(x, y) {};
+
 /**
 * @param {number} x
 * @param {number} y
@@ -2214,17 +2484,25 @@ CaretPosition.prototype.offset;
 Element.prototype.getClientRects = function() {};

 /**
- * @return {!ClientRect}
+ * @return {!DOMRect}
 * @see http://www.w3.org/TR/cssom-view/#dom-element-getboundingclientrect
 */
 Element.prototype.getBoundingClientRect = function() {};

 /**
- * @param {(boolean|{behavior: string, block: string})=} opt_top
+ * @param {(boolean|ScrollIntoViewOptions)=} top
 * @see http://www.w3.org/TR/cssom-view/#dom-element-scrollintoview
 * @return {undefined}
 */
-Element.prototype.scrollIntoView = function(opt_top) {};
+Element.prototype.scrollIntoView = function(top) {};
+
+/**
+ * @param {number|!ScrollToOptions} scrollToOptionsOrX
+ * @param {number=} opt_y
+ * @see https://www.w3.org/TR/cssom-view/#extension-to-the-element-interface
+ * @return {undefined}
+ */
+Element.prototype.scrollTo = function(scrollToOptionsOrX, opt_y) {};

 /**
 * @type {number}
@@ -2316,7 +2594,7 @@ HTMLElement.prototype.offsetHeight;
 Range.prototype.getClientRects = function() {};

 /**
- * @return {!ClientRect}
+ * @return {!DOMRect}
 * @see http://www.w3.org/TR/cssom-view/#dom-range-getboundingclientrect
 */
 Range.prototype.getBoundingClientRect = function() {};
@@ -2395,7 +2673,7 @@ MouseEvent.prototype.offsetY;
 /**
 * @constructor
 * @see http://www.w3.org/TR/cssom-view/#the-clientrectlist-interface
- * @implements {IArrayLike<!ClientRect>}
+ * @implements {IArrayLike<!DOMRect>}
 */
 function ClientRectList() {}

@@ -2407,53 +2685,11 @@ ClientRectList.prototype.length;

 /**
 * @param {number} index
- * @return {ClientRect}
+ * @return {?DOMRect}
 * @see http://www.w3.org/TR/cssom-view/#dom-clientrectlist-item
 */
 ClientRectList.prototype.item = function(index) {};

-/**
- * @constructor
- * @see http://www.w3.org/TR/cssom-view/#the-clientrect-interface
- */
-function ClientRect() {}
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-top
- */
-ClientRect.prototype.top;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-right
- */
-ClientRect.prototype.right;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-bottom
- */
-ClientRect.prototype.bottom;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-left
- */
-ClientRect.prototype.left;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-width
- */
-ClientRect.prototype.width;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-height
- */
-ClientRect.prototype.height;
-
 /**
 * @constructor
 * http://www.w3.org/TR/css3-conditional/#CSS-interface
@@ -2620,12 +2856,12 @@ FontFaceSet.prototype.delete = function(value) {};
 FontFaceSet.prototype.has = function(font) {};

 /**
- * @param {function(!FontFace, number, !FontFaceSet)} cb
- * @param {Object|undefined=} opt_selfObj
+ * @param {function(!FontFace, number, !FontFaceSet)} callback
+ * @param {?Object=} selfObj
 * see http://dev.w3.org/csswg/css-font-loading/#dom-fontfaceset-foreach
 * @return {undefined}
 */
-FontFaceSet.prototype.forEach = function(cb, opt_selfObj) {};
+FontFaceSet.prototype.forEach = function(callback, selfObj) {};

 /**
 * @param {string} font
@@ -2654,3 +2890,92 @@ FontFaceSet.prototype.ready;
 * @see http://dev.w3.org/csswg/css-font-loading/#dom-fontfaceset-status
 */
 FontFaceSet.prototype.status;
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {{
+ *   animationName: (string|undefined),
+ *   elapsedTime: (number|undefined),
+ *   pseudoElement: (string|undefined)
+ * }=} opt_animationEventInitDict
+ * @extends {Event}
+ * @see https://drafts.csswg.org/css-animations/#interface-animationevent
+ */
+function AnimationEvent(type, opt_animationEventInitDict) {};
+
+/**
+ * @type {string}
+ * @see https://drafts.csswg.org/css-animations/#dom-animationevent-animationname
+ */
+AnimationEvent.prototype.animationName;
+
+/**
+ * @type {number}
+ * @see https://drafts.csswg.org/css-animations/#dom-animationevent-elapsedtime
+ */
+AnimationEvent.prototype.elapsedTime;
+
+/**
+ * @type {string}
+ * @see https://drafts.csswg.org/css-animations/#dom-animationevent-pseudoelement
+ */
+AnimationEvent.prototype.pseudoElement;
+
+/**
+ * @constructor
+ * @extends {CSSRule}
+ * @see http://dev.w3.org/csswg/css-animations/#csskeyframerule
+ */
+function CSSKeyframeRule() {}
+
+/**
+ * @type {string}
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframerule-keytext
+ */
+CSSKeyframeRule.prototype.keyText;
+
+/**
+ * @type {!CSSStyleDeclaration}
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframerule-style
+ */
+CSSKeyframeRule.prototype.style;
+
+
+/**
+ * @constructor
+ * @extends {CSSRule}
+ * @see http://dev.w3.org/csswg/css-animations/#csskeyframesrule
+ */
+function CSSKeyframesRule() {}
+
+/**
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-name
+ * @type {string}
+ */
+CSSKeyframesRule.prototype.name;
+
+/**
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-cssrules
+ * @type {!CSSRuleList}
+ */
+CSSKeyframesRule.prototype.cssRules;
+
+/**
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-findrule
+ * @param {string} key The key text for the rule to find.
+ * @return {?CSSKeyframeRule}
+ */
+CSSKeyframesRule.prototype.findRule = function(key) {};
+
+/**
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-appendrule
+ * @param {string} rule The text for the rule to append.
+ */
+CSSKeyframesRule.prototype.appendRule = function(rule) {};
+
+/**
+ * @see https://drafts.csswg.org/css-animations/#dom-csskeyframesrule-deleterule
+ * @param {string} key The key text for the rule to delete.
+ */
+CSSKeyframesRule.prototype.deleteRule = function(key) {};
--- a/javascript/externs/web/w3c_device_sensor_event.js
+++ b/javascript/externs/web/w3c_device_sensor_event.js
@@ -24,11 +24,32 @@
 * @externs
 */

+/**
+ * @record
+ * @extends {EventInit}
+ * @see https://w3c.github.io/deviceorientation/spec-source-orientation.html#deviceorientation
+ */
+function DeviceOrientationEventInit() {}
+
+/** @type {number|undefined} */
+DeviceOrientationEventInit.prototype.alpha;
+
+/** @type {number|undefined} */
+DeviceOrientationEventInit.prototype.beta;
+
+/** @type {number|undefined} */
+DeviceOrientationEventInit.prototype.gamma;
+
+/** @type {boolean|undefined} */
+DeviceOrientationEventInit.prototype.absolute;
+
 /**
 * @constructor
 * @extends {Event}
+ * @param {string} type
+ * @param {!DeviceOrientationEventInit=} opt_eventInitDict
 */
-function DeviceOrientationEvent() {}
+function DeviceOrientationEvent(type, opt_eventInitDict) {}

 /** @type {?number} */
 DeviceOrientationEvent.prototype.alpha;
--- a/javascript/externs/web/w3c_dom1.js
+++ b/javascript/externs/web/w3c_dom1.js
@@ -20,76 +20,75 @@
 *  http://www.w3.org/TR/REC-DOM-Level-1/ecma-script-language-binding.html
 *
 * @externs
- * @author stevey@google.com (Steve Yegge)
 */

 /**
 * @constructor
 * @param {string=} message
- * @param {string=} message
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-17189187
+ * @param {string=} name
+ * @see https://heycam.github.io/webidl/#idl-DOMException
 */
 function DOMException(message, name) {}

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.INDEX_SIZE_ERR = 1;
+DOMException.INDEX_SIZE_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.DOMSTRING_SIZE_ERR = 2;
+DOMException.DOMSTRING_SIZE_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.HIERARCHY_REQUEST_ERR = 3;
+DOMException.HIERARCHY_REQUEST_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.WRONG_DOCUMENT_ERR = 4;
+DOMException.WRONG_DOCUMENT_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.INVALID_CHARACTER_ERR = 5;
+DOMException.INVALID_CHARACTER_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.NO_DATA_ALLOWED_ERR = 6;
+DOMException.NO_DATA_ALLOWED_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.NO_MODIFICATION_ALLOWED_ERR = 7;
+DOMException.NO_MODIFICATION_ALLOWED_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.NOT_FOUND_ERR = 8;
+DOMException.NOT_FOUND_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.NOT_SUPPORTED_ERR = 9;
+DOMException.NOT_SUPPORTED_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-258A00AF
 */
-DOMException.INUSE_ATTRIBUTE_ERR = 10;
+DOMException.INUSE_ATTRIBUTE_ERR;

 /**
 * @constructor
@@ -119,24 +118,13 @@ DOMImplementation.prototype.hasFeature = function(feature, version) {};
 */
 function Node() {}

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-Node.prototype.addEventListener = function(type, listener, opt_useCapture) {};
+/** @override */
+Node.prototype.addEventListener = function(type, listener, opt_options) {};

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-Node.prototype.removeEventListener = function(type, listener, opt_useCapture) {};
+/** @override */
+Node.prototype.removeEventListener = function(type, listener, opt_options) {};

-/**
- * @override
- * @return {boolean}
- */
+/** @override */
 Node.prototype.dispatchEvent = function(evt) {};

 /**
@@ -207,14 +195,16 @@ Node.prototype.previousSibling;

 /**
 * @param {Node} newChild
- * @return {Node}
+ * @return {!Node}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-appendChild
 */
 Node.prototype.appendChild = function(newChild) {};

 /**
 * @param {boolean} deep
- * @return {!Node}
+ * @return {THIS}
+ * @this {THIS}
+ * @template THIS
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-cloneNode
 * @nosideeffects
 */
@@ -251,79 +241,73 @@ Node.prototype.removeChild = function(oldChild) {};
 Node.prototype.replaceChild = function(newChild, oldChild) {};

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.ATTRIBUTE_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.CDATA_SECTION_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.COMMENT_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.DOCUMENT_FRAGMENT_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.DOCUMENT_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.DOCUMENT_TYPE_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.ELEMENT_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.ENTITY_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.ENTITY_REFERENCE_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.PROCESSING_INSTRUCTION_NODE;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.TEXT_NODE;

 /**
- * @type {number}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
- */
-Node.XPATH_NAMESPACE_NODE;
-
-/**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1950641247
 */
 Node.NOTATION_NODE;
@@ -349,7 +333,7 @@ function Document() {}
 Document.prototype.doctype;

 /**
- * @type {!Element}
+ * @type {!HTMLHtmlElement}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#attribute-documentElement
 */
 Document.prototype.documentElement;
@@ -395,25 +379,17 @@ Document.prototype.createDocumentFragment = function() {};
 * Create a DOM element.
 *
 * Web components introduced the second parameter as a way of extending existing
- * tags (e.g. document.createElement('button', 'fancy-button')).
+ * tags (e.g. document.createElement('button', {is: 'fancy-button'})).
 *
 * @param {string} tagName
- * @param {string=} opt_typeExtension
+ * @param {({is: string}|string)=} opt_typeExtension
 * @return {!Element}
 * @nosideeffects
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-createElement
- * @see http://w3c.github.io/webcomponents/spec/custom/#extensions-to-document-interface-to-instantiate
+ * @see https://dom.spec.whatwg.org/#dom-document-createelement
 */
 Document.prototype.createElement = function(tagName, opt_typeExtension) {};

-/**
- * @param {string} name
- * @return {!EntityReference}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-createEntityReference
- * @nosideeffects
- */
-Document.prototype.createEntityReference = function(name) {};
-
 /**
 * @param {string} target
 * @param {string} data
@@ -439,6 +415,32 @@ Document.prototype.createTextNode = function(data) {};
 */
 Document.prototype.getElementsByTagName = function(tagname) {};

+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Document/open
+ * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-open
+ */
+Document.prototype.open;
+
+/**
+ * @return {undefined}
+ * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-close
+ */
+Document.prototype.close = function() {};
+
+/**
+ * @param {!TrustedHTML|string} text
+ * @return {undefined}
+ * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-write
+ */
+Document.prototype.write = function(text) {};
+
+/**
+ * @param {!TrustedHTML|string} text
+ * @return {undefined}
+ * @see https://html.spec.whatwg.org/multipage/dynamic-markup-insertion.html#dom-document-writeln
+ */
+Document.prototype.writeln = function(text) {};
+
 /**
 * @constructor
 * @implements {IArrayLike<T>}
@@ -461,6 +463,33 @@ NodeList.prototype.length;
 */
 NodeList.prototype.item = function(index) {};

+/**
+ * @param {?function(this:S, T, number, !NodeList<T>): ?} callback
+ * @param {S=} opt_thisobj
+ * @template S
+ * @return {undefined}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/forEach
+ */
+NodeList.prototype.forEach = function(callback, opt_thisobj) {};
+
+/**
+ * @return {!IteratorIterable<!Array<number|T>>}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/entries
+ */
+NodeList.prototype.entries = function() {};
+
+/**
+ * @return {!IteratorIterable<number>}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/keys
+ */
+NodeList.prototype.keys = function() {};
+
+/**
+ * @return {!IteratorIterable<T>}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/NodeList/values
+ */
+NodeList.prototype.values = function() {};
+
 /**
 * @constructor
 * @implements {IObject<(string|number), T>}
@@ -599,6 +628,13 @@ Attr.prototype.value;
 */
 function Element() {}

+/**
+ * @type {string}
+ * @implicitCast
+ * @see https://dom.spec.whatwg.org/index.html#dom-element-id
+ */
+Element.prototype.id;
+
 /**
 * An Element always contains a non-null NamedNodeMap containing the attributes
 * of this node.
@@ -626,13 +662,13 @@ Element.prototype.className;

 /**
 * @param {string} name
- * @param {number?=} opt_flags
+ * @param {?number=} flags
 * @return {string}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-getAttribute
 * @see http://msdn.microsoft.com/en-us/library/ms536429(VS.85).aspx
 * @nosideeffects
 */
-Element.prototype.getAttribute = function(name, opt_flags) {};
+Element.prototype.getAttribute = function(name, flags) {};

 /**
 * @param {string} name
@@ -666,9 +702,9 @@ Element.prototype.removeAttributeNode = function(oldAttr) {};

 /**
 * @param {string} name
- * @param {string|number|boolean} value Values are converted to strings with
- *     ToString, so we accept number and boolean since both convert easily to
- *     strings.
+ * @param {string|number|boolean|!TrustedHTML|!TrustedScriptURL}
+ *     value Values are converted to strings with ToString, so we accept number
+ *     and boolean since both convert easily to strings.
 * @return {undefined}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#method-setAttribute
 */
@@ -706,8 +742,8 @@ Element.prototype.setAttributeNode = function(newAttr) {};
 /** @type {?function (Event)} */ Element.prototype.onkeydown;
 /** @type {?function (Event)} */ Element.prototype.onkeypress;
 /** @type {?function (Event)} */ Element.prototype.onkeyup;
-/** @type {?function (Event)} */ Element.prototype.onload;
-/** @type {?function (Event)} */ Element.prototype.onunload;
+/** @type {?function (Event): void} */ Element.prototype.onload;
+/** @type {?function (Event): void} */ Element.prototype.onunload;
 /** @type {?function (Event)} */ Element.prototype.onmousedown;
 /** @type {?function (Event)} */ Element.prototype.onmousemove;
 /** @type {?function (Event)} */ Element.prototype.onmouseout;
@@ -726,9 +762,10 @@ Element.prototype.setAttributeNode = function(newAttr) {};
 /**
 * @constructor
 * @extends {CharacterData}
+ * @param {string=} contents Optional textual content.
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1312295772
 */
-function Text() {}
+function Text(contents) {}

 /**
 * @param {number} offset
@@ -758,75 +795,12 @@ function CDATASection() {}
 */
 function DocumentType() {}

-/**
- * @type {NamedNodeMap<!Entity>}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1788794630
- */
-DocumentType.prototype.entities;
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-1844763134
 */
 DocumentType.prototype.name;

-/**
- * @type {NamedNodeMap<!Notation>}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-D46829EF
- */
-DocumentType.prototype.notations;
-
-/**
- * @constructor
- * @extends {Node}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-5431D1B9
- */
-function Notation() {}
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-54F2B4D0
- */
-Notation.prototype.publicId;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-E8AAB1D0
- */
-Notation.prototype.systemId;
-
-/**
- * @constructor
- * @extends {Node}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-527DCFF2
- */
-function Entity() {}
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-D7303025
- */
-Entity.prototype.publicId;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-D7C29F3E
- */
-Entity.prototype.systemId;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-6ABAEB38
- */
-Entity.prototype.notationName;
-
-/**
- * @constructor
- * @extends {Node}
- * @see http://www.w3.org/TR/1998/REC-DOM-Level-1-19981001/level-one-core.html#ID-11C98490
- */
-function EntityReference() {}
-
 /**
 * @constructor
 * @extends {Node}
@@ -854,25 +828,13 @@ ProcessingInstruction.prototype.target;
 function Window() {}
 Window.prototype.Window;

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-Window.prototype.addEventListener = function(type, listener, opt_useCapture) {};
+/** @override */
+Window.prototype.addEventListener = function(type, listener, opt_options) {};

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-Window.prototype.removeEventListener = function(type, listener, opt_useCapture)
-    {};
+/** @override */
+Window.prototype.removeEventListener = function(type, listener, opt_options) {};

-/**
- * @override
- * @return {boolean}
- */
+/** @override */
 Window.prototype.dispatchEvent = function(evt) {};

 /** @type {?function (Event)} */ Window.prototype.onabort;
@@ -885,9 +847,11 @@ Window.prototype.dispatchEvent = function(evt) {};
 /** @type {?function (Event)} */ Window.prototype.ondblclick;
 /** @type {?function (Event)} */ Window.prototype.ondragdrop;
 // onerror has a special signature.
-// See https://developer.mozilla.org/en/DOM/window.onerror
-// and http://msdn.microsoft.com/en-us/library/cc197053(VS.85).aspx
-/** @type {?function (string, string, number)} */
+// See
+//  https://developer.mozilla.org/en-US/docs/Web/API/GlobalEventHandlers/onerror
+/**
+ * @type {?function (string, string, number, number, !Error):?}
+ */
 Window.prototype.onerror;
 /** @type {?function (Event)} */ Window.prototype.onfocus;
 /** @type {?function (Event)} */ Window.prototype.onhashchange;
@@ -908,5 +872,7 @@ Window.prototype.onerror;
 /** @type {?function (Event)} */ Window.prototype.onscroll;
 /** @type {?function (Event)} */ Window.prototype.onselect;
 /** @type {?function (Event=)} */ Window.prototype.onsubmit;
+/** @type {?function (Event)} */ Window.prototype.onunhandledrejection;
 /** @type {?function (Event)} */ Window.prototype.onunload;
 /** @type {?function (Event)} */ Window.prototype.onwheel;
+/** @type {?function (Event)} */ Window.prototype.onstorage;
--- a/javascript/externs/web/w3c_dom2.js
+++ b/javascript/externs/web/w3c_dom2.js
@@ -51,6 +51,32 @@ Document.prototype.createElementNS =
 Document.prototype.createAttributeNS =
    function(namespaceURI, qualifiedName) {};

+/**
+ * @param {Node} root
+ * @param {number=} whatToShow
+ * @param {NodeFilter=} filter
+ * @param {boolean=} entityReferenceExpansion
+ * @return {!NodeIterator}
+ * @see https://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113/traversal.html#Traversal-Document
+ * @see https://dom.spec.whatwg.org/#interface-document
+ * @nosideeffects
+ */
+Document.prototype.createNodeIterator = function(
+    root, whatToShow, filter, entityReferenceExpansion) {};
+
+/**
+ * @param {Node} root
+ * @param {number=} whatToShow
+ * @param {NodeFilter=} filter
+ * @param {boolean=} entityReferenceExpansion
+ * @return {!TreeWalker}
+ * @see https://www.w3.org/TR/2000/REC-DOM-Level-2-Traversal-Range-20001113/traversal.html#Traversal-Document
+ * @see https://dom.spec.whatwg.org/#interface-document
+ * @nosideeffects
+ */
+Document.prototype.createTreeWalker = function(
+    root, whatToShow, filter, entityReferenceExpansion) {};
+
 /**
 * @param {string} namespace
 * @param {string} name
@@ -61,9 +87,9 @@ Document.prototype.createAttributeNS =
 Document.prototype.getElementsByTagNameNS = function(namespace, name) {};

 /**
- * @param {Node} externalNode
- * @param {boolean} deep
- * @return {Node}
+ * @param {!Node} externalNode
+ * @param {boolean=} deep
+ * @return {!Node}
 * @see https://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/core.html#Core-Document-importNode
 */
 Document.prototype.importNode = function(externalNode, deep) {};
@@ -72,6 +98,7 @@ Document.prototype.importNode = function(externalNode, deep) {};
 * @constructor
 * @implements {IObject<(string|number),T>}
 * @implements {IArrayLike<T>}
+ * @implements {Iterable<T>}
 * @template T
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-75708506
 */
@@ -101,26 +128,44 @@ HTMLCollection.prototype.namedItem = function(name) {};

 /**
 * @constructor
- * @implements {IObject<(string|number),HTMLOptionElement>}
- * @implements {IArrayLike<!HTMLOptionElement>}
- * @see http://www.w3.org/TR/DOM-Level-2-HTML/html.html#HTMLOptionsCollection
+ * @extends {HTMLCollection<HTMLOptionElement>}
+ * @see https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#htmloptionscollection
 */
 function HTMLOptionsCollection() {}

 /**
 * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-HTML/html.html#HTMLOptionsCollection-length
+ * @see https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#dom-htmloptionscollection-length
+ * @nosideeffects
 */
 HTMLOptionsCollection.prototype.length;

 /**
+ * @param {HTMLOptionElement|HTMLOptGroupElement} element
+ * @param {HTMLElement|number=} before
+ * @return {undefined}
+ * @see https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#dom-htmloptionscollection-add
+ */
+HTMLOptionsCollection.prototype.add = function(element, before) {};
+
+/**
+ * NOTE(tjgq): The HTMLOptionsCollection#item method is inherited from
+ * HTMLCollection, but it must be declared explicitly to work around an error
+ * when building a jsinterop library for GWT.
 * @param {number} index
- * @return {Node}
- * @see http://www.w3.org/TR/DOM-Level-2-HTML/html.html#HTMLOptionsCollection-item
+ * @return {HTMLOptionElement}
+ * @override
 * @nosideeffects
 */
 HTMLOptionsCollection.prototype.item = function(index) {};

+/**
+ * @param {number} index
+ * @return {undefined}
+ * @see https://html.spec.whatwg.org/multipage/common-dom-interfaces.html#dom-htmloptionscollection-remove
+ */
+HTMLOptionsCollection.prototype.remove = function(index) {};
+
 /**
 * @constructor
 * @extends {Document}
@@ -205,29 +250,6 @@ HTMLDocument.prototype.cookie;
 */
 HTMLDocument.prototype.open = function(opt_mimeType, opt_replace) {};

-/**
- * @return {undefined}
- * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-98948567
- * @override
- */
-HTMLDocument.prototype.close = function() {};
-
-/**
- * @param {string} text
- * @return {undefined}
- * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-75233634
- * @override
- */
-HTMLDocument.prototype.write = function(text) {};
-
-/**
- * @param {string} text
- * @return {undefined}
- * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-35318390
- * @override
- */
-HTMLDocument.prototype.writeln = function(text) {};
-
 /**
 * @param {string} elementName
 * @return {!NodeList<!Element>}
@@ -236,30 +258,6 @@ HTMLDocument.prototype.writeln = function(text) {};
 */
 HTMLDocument.prototype.getElementsByName = function(elementName) {};

-/**
- * @param {Node} root
- * @param {number=} whatToShow
- * @param {NodeFilter=} filter
- * @param {boolean=} entityReferenceExpansion
- * @return {!NodeIterator}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/traversal.html#Traversal-Document
- * @nosideeffects
- */
-HTMLDocument.prototype.createNodeIterator = function(
-    root, whatToShow, filter, entityReferenceExpansion) {};
-
-/**
- * @param {Node} root
- * @param {number=} whatToShow
- * @param {NodeFilter=} filter
- * @param {boolean=} entityReferenceExpansion
- * @return {!TreeWalker}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/traversal.html#Traversal-Document
- * @nosideeffects
- */
-HTMLDocument.prototype.createTreeWalker = function(
-    root, whatToShow, filter, entityReferenceExpansion) {};
-

 /** @typedef {{
  createNodeIterator: function(Node, number=, NodeFilter=, boolean=) : NodeIterator,
@@ -268,7 +266,7 @@ HTMLDocument.prototype.createTreeWalker = function(
 var TraversalDocument;

 /**
- * @interface
+ * @record
 * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/traversal.html#Traversal-NodeFilter
 */
 function NodeFilter() {}
@@ -405,13 +403,6 @@ TreeWalker.prototype.currentNode;
 */
 function HTMLElement() {}

-/**
- * @implicitCast
- * @type {string}
- * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-63534901
- */
-HTMLElement.prototype.id;
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-78276800
@@ -497,6 +488,7 @@ HTMLLinkElement.prototype.charset;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-33532588
 */
 HTMLLinkElement.prototype.href;
@@ -540,6 +532,12 @@ HTMLLinkElement.prototype.type;
 /** @type {StyleSheet} */
 HTMLLinkElement.prototype.sheet;

+/**
+ * @type {!DOMTokenList}
+ * @see https://github.com/WICG/webpackage/blob/master/explainers/subresource-loading.md
+ */
+HTMLLinkElement.prototype.resources;
+
 /**
 * @constructor
 * @extends {HTMLElement}
@@ -593,6 +591,7 @@ function HTMLBaseElement() {}

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-65382887
 */
 HTMLBaseElement.prototype.href;
@@ -710,7 +709,6 @@ function HTMLFormControlsCollection() {}
 * @see https://html.spec.whatwg.org/multipage/infrastructure.html#dom-htmlformcontrolscollection-nameditem
 * @nosideeffects
 * @override
- * @suppress {newCheckTypes}
 */
 HTMLFormControlsCollection.prototype.namedItem = function(name) {};

@@ -722,7 +720,7 @@ HTMLFormControlsCollection.prototype.namedItem = function(name) {};
 function HTMLFormElement() {}

 /**
- * @type {HTMLFormControlsCollection<!HTMLElement>}
+ * @type {!HTMLFormControlsCollection<!HTMLElement>}
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-76728479
 */
 HTMLFormElement.prototype.elements;
@@ -747,6 +745,7 @@ HTMLFormElement.prototype.acceptCharset;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-74049184
 */
 HTMLFormElement.prototype.action;
@@ -954,6 +953,20 @@ HTMLOptionElement.prototype.text;
 */
 HTMLOptionElement.prototype.value;

+
+
+/**
+ * @constructor
+ * @extends {HTMLOptionElement}
+ * @param {*=} opt_text
+ * @param {*=} opt_value
+ * @param {*=} opt_defaultSelected
+ * @param {*=} opt_selected
+ */
+function Option(opt_text, opt_value, opt_defaultSelected, opt_selected) {}
+
+
+
 /**
 * @constructor
 * @extends {HTMLElement}
@@ -1041,6 +1054,7 @@ HTMLInputElement.prototype.size;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-97320704
 */
 HTMLInputElement.prototype.src;
@@ -1618,6 +1632,7 @@ HTMLAnchorElement.prototype.coords;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-88517319
 */
 HTMLAnchorElement.prototype.href;
@@ -1803,6 +1818,7 @@ HTMLObjectElement.prototype.code;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-25709136
 */
 HTMLObjectElement.prototype.codeBase;
@@ -1821,6 +1837,7 @@ HTMLObjectElement.prototype.contentDocument;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-81766986
 */
 HTMLObjectElement.prototype.data;
@@ -2045,6 +2062,7 @@ HTMLAreaElement.prototype.coords;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-34672936
 */
 HTMLAreaElement.prototype.href;
@@ -2104,14 +2122,21 @@ HTMLScriptElement.prototype.event;
 */
 HTMLScriptElement.prototype.htmlFor;

+/**
+ * @type {?function(!Event)}
+ */
+HTMLScriptElement.prototype.onreadystatechange;
+
 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-75147231
 */
 HTMLScriptElement.prototype.src;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-46872999
 */
 HTMLScriptElement.prototype.text;
@@ -2436,7 +2461,7 @@ HTMLTableRowElement.prototype.deleteCell = function(index) {};

 /**
 * @param {number} index
- * @return {HTMLElement}
+ * @return {!HTMLElement}
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-68927016
 */
 HTMLTableRowElement.prototype.insertCell = function(index) {};
@@ -2616,6 +2641,7 @@ HTMLFrameElement.prototype.scrolling;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-78799535
 */
 HTMLFrameElement.prototype.src;
@@ -2684,6 +2710,7 @@ HTMLIFrameElement.prototype.scrolling;

 /**
 * @type {string}
+ * @implicitCast
 * @see http://www.w3.org/TR/2000/CR-DOM-Level-2-20000510/html.html#ID-43933957
 */
 HTMLIFrameElement.prototype.src;
@@ -2696,31 +2723,253 @@ HTMLIFrameElement.prototype.src;
 HTMLIFrameElement.prototype.width;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-258A00AF
 */
-DOMException.INVALID_STATE_ERR = 11;
+DOMException.INVALID_STATE_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-258A00AF
 */
-DOMException.SYNTAX_ERR = 12;
+DOMException.SYNTAX_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-258A00AF
 */
-DOMException.INVALID_MODIFICATION_ERR = 13;
+DOMException.INVALID_MODIFICATION_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-258A00AF
 */
-DOMException.NAMESPACE_ERR = 14;
+DOMException.NAMESPACE_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Core/core.html#ID-258A00AF
 */
-DOMException.INVALID_ACCESS_ERR = 15;
+DOMException.INVALID_ACCESS_ERR;
+/**
+ * @type {boolean}
+ * @see https://developer.mozilla.org/en/DOM/window.closed
+ */
+Window.prototype.closed;
+
+/**
+ * @type {HTMLObjectElement|HTMLIFrameElement|null}
+ * @see https://developer.mozilla.org/en/DOM/window.frameElement
+ */
+Window.prototype.frameElement;
+
+/**
+ * Allows lookup of frames by index or by name.
+ * @type {!Window}
+ * @see https://developer.mozilla.org/en/DOM/window.frames
+ */
+Window.prototype.frames;
+
+/**
+ * @type {!History}
+ * @suppress {duplicate}
+ * @see https://developer.mozilla.org/en/DOM/window.history
+ */
+var history;
+
+/**
+ * @type {!History}
+ * @see https://developer.mozilla.org/en/DOM/window.history
+ */
+Window.prototype.history;
+
+/**
+ * Returns the number of frames (either frame or iframe elements) in the
+ * window.
+ *
+ * @type {number}
+ * @see https://developer.mozilla.org/en/DOM/window.length
+ */
+Window.prototype.length;
+
+/**
+ * Location has an exception in the DeclaredGlobalExternsOnWindow pass
+ * so we have to manually include it:
+ * https://github.com/google/closure-compiler/blob/master/src/com/google/javascript/jscomp/DeclaredGlobalExternsOnWindow.java#L116
+ *
+ * @type {!Location}
+ * @implicitCast
+ * @see https://developer.mozilla.org/en/DOM/window.location
+ */
+Window.prototype.location;
+
+/**
+
+ * @type {string}
+ * @see https://developer.mozilla.org/en/DOM/window.name
+ */
+Window.prototype.name;
+
+/**
+ * @type {!Navigator}
+ * @see https://developer.mozilla.org/en/DOM/window.navigator
+ */
+Window.prototype.navigator;
+
+/**
+ * @type {?Window}
+ * @see https://developer.mozilla.org/en/DOM/window.opener
+ */
+Window.prototype.opener;
+
+/**
+ * @type {!Window}
+ * @see https://developer.mozilla.org/en/DOM/window.parent
+ */
+Window.prototype.parent;
+
+/**
+ * @type {!Window}
+ * @see https://developer.mozilla.org/en/DOM/window.self
+ */
+Window.prototype.self;
+
+/**
+ * @type {?string}
+ * @see https://developer.mozilla.org/en/DOM/window.status
+ */
+Window.prototype.status;
+
+/**
+ * @interface
+ * @see https://html.spec.whatwg.org/multipage/window-object.html#the-status-bar-barprop-object
+ */
+function BarProp() {}
+
+/** @const {boolean} */
+BarProp.prototype.visible;
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.locationbar
+ */
+Window.prototype.locationbar;
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.menubar
+ */
+Window.prototype.menubar;
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.personalbar
+ */
+Window.prototype.personalbar;
+
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.scrollbars
+ */
+Window.prototype.scrollbars;
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.statusbar
+ */
+Window.prototype.statusbar;
+
+/**
+ * @type {!BarProp}
+ * @see https://developer.mozilla.org/en/DOM/window.toolbar
+ */
+Window.prototype.toolbar;
+
+/**
+ * @type {!Window}
+ * @see https://developer.mozilla.org/en/DOM/window.self
+ */
+Window.prototype.top;
+
+/**
+ * @type {!Window}
+ * @see https://developer.mozilla.org/en/DOM/window.self
+ */
+Window.prototype.window;
+
+/**
+ * @param {*} message
+ * @see https://developer.mozilla.org/en/DOM/window.alert
+ * @return {undefined}
+ */
+Window.prototype.alert = function(message) {};
+
+/**
+ * @param {*} message
+ * @return {boolean}
+ * @see https://developer.mozilla.org/en/DOM/window.confirm
+ */
+Window.prototype.confirm = function(message) {};
+
+/**
+ * @param {string} message
+ * @param {string=} value
+ * @return {?string}
+ * @see https://developer.mozilla.org/en/DOM/window.prompt
+ */
+Window.prototype.prompt = function(message, value) {};
+
+/**
+ * @see https://developer.mozilla.org/en/DOM/window.blur
+ * @return {undefined}
+ */
+Window.prototype.blur = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en/DOM/window.close
+ * @return {undefined}
+ */
+Window.prototype.close = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en/DOM/window.focus
+ * @return {undefined}
+ */
+Window.prototype.focus = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Window/print
+ * @return {undefined}
+ */
+Window.prototype.print = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Window/stop
+ * @return {undefined}
+ */
+Window.prototype.stop = function() {};
+
+/**
+ * @param {*=} url
+ * @param {string=} windowName
+ * @param {string=} windowFeatures
+ * @param {boolean=} replace
+ * @return {Window}
+ * @see http://msdn.microsoft.com/en-us/library/ms536651(VS.85).aspx
+ */
+Window.prototype.open = function(url, windowName, windowFeatures, replace) {};
+
+/**
+ * @type {string}
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Element/innerHTML
+ * @implicitCast
+ */
+Element.prototype.innerHTML;
+
+/**
+ * @type {string}
+ * @implicitCast
+ * @see https://w3c.github.io/DOM-Parsing/#extensions-to-the-element-interface
+ */
+Element.prototype.outerHTML;
--- a/javascript/externs/web/w3c_dom3.js
+++ b/javascript/externs/web/w3c_dom3.js
@@ -32,16 +32,16 @@
 DOMException.prototype.code;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-258A00AF
 */
-DOMException.VALIDATION_ERR = 16;
+DOMException.VALIDATION_ERR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-258A00AF
 */
-DOMException.TYPE_MISMATCH_ERR = 17;
+DOMException.TYPE_MISMATCH_ERR;

 /**
 * @constructor
@@ -72,52 +72,6 @@ DOMStringList.prototype.contains = function(str) {};
 */
 DOMStringList.prototype.item = function(index) {};

-/**
- * @constructor
- * @implements {IArrayLike<string>}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList
- */
-function NameList() {}
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList-length
- */
-NameList.prototype.length;
-
-/**
- * @param {string} str
- * @return {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList-contains
- * @nosideeffects
- */
-NameList.prototype.contains = function(str) {};
-
-/**
- * @param {?string} namespaceURI
- * @param {string} name
- * @return {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList-containsNS
- * @nosideeffects
- */
-NameList.prototype.containsNS = function(namespaceURI, name) {};
-
-/**
- * @param {number} index
- * @return {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList-getName
- * @nosideeffects
- */
-NameList.prototype.getName = function(index) {};
-
-/**
- * @param {number} index
- * @return {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#NameList-getNamespaceURI
- * @nosideeffects
- */
-NameList.prototype.getNamespaceURI = function(index) {};
-
 /**
 * @constructor
 * @implements {IArrayLike<!DOMImplementation>}
@@ -148,9 +102,9 @@ function DOMImplementationSource() {}
 /**
 * @param {?string} namespaceURI
 * @param {string} publicId
- * @param {DocumentType} doctype
+ * @param {DocumentType=} doctype
 * @return {Document}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Level-2-Core-DOM-createDocument
+ * @see https://dom.spec.whatwg.org/#ref-for-dom-domimplementation-createdocument%E2%91%A0
 * @nosideeffects
 */
 DOMImplementation.prototype.createDocument = function(namespaceURI, publicId, doctype) {};
@@ -181,15 +135,6 @@ DOMImplementationSource.prototype.getDOMImplementation = function(features) {};
 */
 DOMImplementationSource.prototype.getDOMImplementationList = function(features) {};

-/**
- * @param {string} feature
- * @param {string} version
- * @return {Object}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMImplementation3-getFeature
- * @nosideeffects
- */
-DOMImplementation.prototype.getFeature = function(feature, version) {};
-
 /**
 * @param {Node} externalNode
 * @return {Node}
@@ -203,24 +148,12 @@ Document.prototype.adoptNode = function(externalNode) {};
 */
 Document.prototype.documentURI;

-/**
- * @type {DOMConfiguration}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-domConfig
- */
-Document.prototype.domConfig;
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-inputEncoding
 */
 Document.prototype.inputEncoding;

-/**
- * @type {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-strictErrorChecking
- */
-Document.prototype.strictErrorChecking;
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-encoding
@@ -239,21 +172,6 @@ Document.prototype.xmlStandalone;
 */
 Document.prototype.xmlVersion;

-/**
- * @return {undefined}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-normalizeDocument
- */
-Document.prototype.normalizeDocument = function() {};
-
-/**
- * @param {Node} n
- * @param {?string} namespaceURI
- * @param {string} qualifiedName
- * @return {Node}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Document3-renameNode
- */
-Document.prototype.renameNode = function(n, namespaceURI, qualifiedName) {};
-
 /**
 * @type {?string}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-baseURI
@@ -286,40 +204,40 @@ Node.prototype.prefix;
 Node.prototype.textContent;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_DISCONNECTED
 */
-Node.DOCUMENT_POSITION_DISCONNECTED = 0x01;
+Node.DOCUMENT_POSITION_DISCONNECTED;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_PRECEDING
 */
-Node.DOCUMENT_POSITION_PRECEDING    = 0x02;
+Node.DOCUMENT_POSITION_PRECEDING;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_FOLLOWING
 */
-Node.DOCUMENT_POSITION_FOLLOWING    = 0x04;
+Node.DOCUMENT_POSITION_FOLLOWING;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_CONTAINS
 */
-Node.DOCUMENT_POSITION_CONTAINS     = 0x08;
+Node.DOCUMENT_POSITION_CONTAINS;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_CONTAINED_BY
 */
-Node.DOCUMENT_POSITION_CONTAINED_BY = 0x10;
+Node.DOCUMENT_POSITION_CONTAINED_BY;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node-DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC
 */
-Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 0x20;
+Node.DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC;

 /**
 * @param {Node} other
@@ -377,15 +295,6 @@ Node.prototype.isEqualNode = function(arg) {};
 */
 Node.prototype.isSameNode = function(other) {};

-/**
- * @param {string} feature
- * @param {string} version
- * @return {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Level-2-Core-Node-supports
- * @nosideeffects
- */
-Node.prototype.isSupported = function(feature, version) {};
-
 /**
 * @param {string} prefix
 * @return {string}
@@ -408,15 +317,6 @@ Node.prototype.lookupPrefix = function(namespaceURI) {};
 */
 Node.prototype.normalize = function() {};

-/**
- * @param {Object} key
- * @param {Object} data
- * @param {UserDataHandler} handler
- * @return {Object}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Node3-setUserData'
- */
-Node.prototype.setUserData = function(key, data, handler) {};
-
 /**
 * @param {string} query
 * @return {?Element}
@@ -445,18 +345,6 @@ Attr.prototype.ownerElement;
 */
 Attr.prototype.isId;

-/**
- * @type {TypeInfo}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Attr-schemaTypeInfo
- */
-Attr.prototype.schemaTypeInfo;
-
-/**
- * @type {TypeInfo}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Element-schemaTypeInfo
- */
-Element.prototype.schemaTypeInfo;
-
 /**
 * @param {?string} namespaceURI
 * @param {string} localName
@@ -527,144 +415,12 @@ Element.prototype.setAttributeNodeNS = function(newAttr) {};
 */
 Element.prototype.setAttributeNS = function(namespaceURI, qualifiedName, value) {};

-/**
- * @param {string} name
- * @param {boolean} isId
- * @return {undefined}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-ElSetIdAttr
- */
-Element.prototype.setIdAttribute = function(name, isId) {};
-
-/**
- * @param {Attr} idAttr
- * @param {boolean} isId
- * @return {undefined}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-ElSetIdAttrNode
- */
-Element.prototype.setIdAttributeNode = function(idAttr, isId) {};
-
-/**
- * @param {?string} namespaceURI
- * @param {string} localName
- * @param {boolean} isId
- * @return {undefined}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-ElSetIdAttrNS
- */
-Element.prototype.setIdAttributeNS = function(namespaceURI, localName, isId) {};
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Text3-wholeText
 */
 Text.prototype.wholeText;

-/**
- * @param {string} newText
- * @return {Text}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Text3-replaceWholeText
- */
-Text.prototype.replaceWholeText = function(newText) {};
-
-/**
- * @constructor
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo
- */
-function TypeInfo() {}
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-DERIVATION_EXTENSION
- */
-TypeInfo.prototype.DERIVATION_EXTENSION;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-DERIVATION_LIST
- */
-TypeInfo.prototype.DERIVATION_LIST;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-DERIVATION_RESTRICTION
- */
-TypeInfo.prototype.DERIVATION_RESTRICTION;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-DERIVATION_UNION
- */
-TypeInfo.prototype.DERIVATION_UNION;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-typeName
- */
-TypeInfo.prototype.typeName;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-typeNamespace
- */
-TypeInfo.prototype.typeNamespace;
-
-/**
- * @param {string} typeNamespaceArg
- * @param {string} typeNameArg
- * @param {number} derivationMethod
- * @return {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#TypeInfo-isDerivedFrom
- * @nosideeffects
- */
-TypeInfo.prototype.isDerivedFrom = function(typeNamespaceArg, typeNameArg, derivationMethod) {};
-
-/**
- * @constructor
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler
- */
-function UserDataHandler() {}
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler-CLONED
- */
-UserDataHandler.prototype.NODE_CLONED = 1;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler-IMPORTED
- */
-UserDataHandler.prototype.NODE_IMPORTED = 2;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler-DELETED
- */
-UserDataHandler.prototype.NODE_DELETED = 3;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler-RENAMED
- */
-UserDataHandler.prototype.NODE_RENAMED = 4;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#UserDataHandler-ADOPTED
- */
-UserDataHandler.prototype.NODE_ADOPTED = 5;
-
-/**
- * @param {number} operation
- * @param {string} key
- * @param {*=} opt_data
- * @param {?Node=} opt_src
- * @param {?Node=} opt_dst
- * @return {undefined}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-handleUserDataEvent
- */
-UserDataHandler.prototype.handle = function(operation, key, opt_data,
-  opt_src, opt_dst) {};
-
 /**
 * @constructor
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ERROR-Interfaces-DOMError
@@ -696,22 +452,22 @@ DOMError.prototype.relatedData;
 DOMError.prototype.relatedException;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ERROR-DOMError-severity-warning
 */
-DOMError.SEVERITY_WARNING = 1;
+DOMError.SEVERITY_WARNING;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ERROR-DOMError-severity-error
 */
-DOMError.SEVERITY_ERROR = 2;
+DOMError.SEVERITY_ERROR;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ERROR-DOMError-severity-fatal-error
 */
-DOMError.SEVERITY_FATAL_ERROR = 3;
+DOMError.SEVERITY_FATAL_ERROR;

 /**
 * @type {number}
@@ -786,48 +542,6 @@ DOMLocator.prototype.uri;
 */
 DOMLocator.prototype.utf16Offset;

-/**
- * @constructor
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMConfiguration
- */
-function DOMConfiguration() {}
-
-/**
- * @type {DOMStringList}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMConfiguration-parameterNames
- */
-DOMConfiguration.prototype.parameterNames;
-
-/**
- * @param {string} name
- * @return {boolean}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMConfiguration-canSetParameter
- * @nosideeffects
- */
-DOMConfiguration.prototype.canSetParameter = function(name) {};
-
-/**
- * @param {string} name
- * @return {*}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMConfiguration-getParameter
- * @nosideeffects
- */
-DOMConfiguration.prototype.getParameter = function(name) {};
-
-/**
- * @param {string} name
- * @param {*} value
- * @return {*}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#DOMConfiguration-property
- */
-DOMConfiguration.prototype.setParameter = function(name, value) {};
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-Core-DocType-internalSubset
- */
-DocumentType.prototype.internalSubset;
-
 /**
 * @type {string}
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-Core-DocType-publicId
@@ -839,21 +553,3 @@ DocumentType.prototype.publicId;
 * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#ID-Core-DocType-systemId
 */
 DocumentType.prototype.systemId;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Entity3-inputEncoding
- */
-Entity.prototype.inputEncoding;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Entity3-encoding
- */
-Entity.prototype.xmlEncoding;
-
-/**
- * @type {string}
- * @see http://www.w3.org/TR/DOM-Level-3-Core/core.html#Entity3-version
- */
-Entity.prototype.xmlVersion;
--- a/javascript/externs/web/w3c_dom4.js
+++ b/javascript/externs/web/w3c_dom4.js
@@ -46,3 +46,223 @@ Element.prototype.remove = function() {};
 * @see https://www.w3.org/TR/domcore/#dom-childnode-remove
 */
 CharacterData.prototype.remove = function() {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-replacewith
+ */
+DocumentType.prototype.replaceWith = function(nodes) {};
+
+/**
+ * @const {string}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#sec-domerror
+ */
+DOMException.prototype.name;
+
+/**
+ * @const {string}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#sec-domerror
+ */
+DOMException.prototype.message;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.SECURITY_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.NETWORK_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.ABORT_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.URL_MISMATCH_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.QUOTA_EXCEEDED_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.TIMEOUT_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.INVALID_NODE_TYPE_ERR;
+
+/**
+ * @const {number}
+ * @see https://www.w3.org/TR/2015/REC-dom-20151119/#dfn-error-names-table
+ */
+DOMException.DATA_CLONE_ERR;
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-replacewith
+ */
+Element.prototype.replaceWith = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-replacewith
+ */
+CharacterData.prototype.replaceWith = function(nodes) {};
+
+/**
+ * @return {!Array<string>}
+ * @see https://dom.spec.whatwg.org/#dom-element-getattributenames
+ */
+Element.prototype.getAttributeNames = function() {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-append
+ */
+Element.prototype.append = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-append
+ */
+Document.prototype.append = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-append
+ */
+DocumentFragment.prototype.append = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-prepend
+ */
+Element.prototype.prepend = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-prepend
+ */
+Document.prototype.prepend = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-parentnode-prepend
+ */
+DocumentFragment.prototype.prepend = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-before
+ */
+Element.prototype.before = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-before
+ */
+DocumentType.prototype.before = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-before
+ */
+CharacterData.prototype.before = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-after
+ */
+Element.prototype.after = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-after
+ */
+DocumentType.prototype.after = function(nodes) {};
+
+/**
+ * @param {...(!Node|string)} nodes
+ * @return {undefined}
+ * @see https://dom.spec.whatwg.org/#dom-childnode-after
+ */
+CharacterData.prototype.after = function(nodes) {};
+
+/**
+ * @param {string} name
+ * @param {boolean=} force
+ * @return {boolean}
+ * @throws {DOMException}
+ * @see https://dom.spec.whatwg.org/#dom-element-toggleattribute
+ */
+Element.prototype.toggleAttribute = function(name, force) {};
+
+/**
+ * @type {Element}
+ * @see http://msdn.microsoft.com/en-us/library/ms534327(VS.85).aspx
+ */
+Node.prototype.parentElement;
+
+/**
+ * @param {string} name
+ * @return {!HTMLCollection<!Element>}
+ * @nosideeffects
+ * @see https://dom.spec.whatwg.org/#dom-document-getelementsbyclassname-classnames-classnames
+ */
+Document.prototype.getElementsByClassName = function(name) {};
+
+/**
+ * @param {string} classNames
+ * @return {!HTMLCollection<!Element>}
+ * @nosideeffects
+ * @see https://dom.spec.whatwg.org/#dom-element-getelementsbyclassname-classnames-classnames
+ */
+Element.prototype.getElementsByClassName = function(classNames) {};
+
+/**
+ * @param {string} where
+ * @param {Element} element
+ * @return {!Element}
+ * @throws {DOMException}
+ * @see https://dom.spec.whatwg.org/#dom-element-insertadjacentelement
+ */
+Element.prototype.insertAdjacentElement = function(where, element) {};
+
+/**
+ * @param {string} where
+ * @param {string} data
+ * @return {undefined}
+ * @throws {DOMException}
+ * @see https://dom.spec.whatwg.org/#dom-element-insertadjacenttext
+ */
+Element.prototype.insertAdjacentText = function(where, data) {};
--- a/javascript/externs/web/w3c_encoding.js
+++ b/javascript/externs/web/w3c_encoding.js
@@ -1,54 +0,0 @@
-/*
- * Copyright 2015 The Closure Compiler Authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-/**
- * @fileoverview Definitions for W3C's Encoding specification
- *     https://encoding.spec.whatwg.org
- * @externs
- */
-
-/**
- * @constructor
- * @param {string=} encoding
- * @param {Object=} options
- */
-function TextDecoder(encoding, options) {}
-
-/** @type {string} **/ TextDecoder.prototype.encoding;
-/** @type {boolean} **/ TextDecoder.prototype.fatal;
-/** @type {boolean} **/ TextDecoder.prototype.ignoreBOM;
-
-/**
- * @param {!Uint8Array} input
- * @param {Object=} options
- * @return {string}
- */
-TextDecoder.prototype.decode = function decode(input, options) {};
-
-/**
- * @constructor
- * @param {string=} encoding
- * @param {Object=} options
- */
-function TextEncoder(encoding, options) {}
-
-/** @type {string} **/ TextEncoder.prototype.encoding;
-
-/**
- * @param {string} input
- * @return {!Uint8Array}
- */
-TextEncoder.prototype.encode = function(input) {};
--- a/javascript/externs/web/w3c_event.js
+++ b/javascript/externs/web/w3c_event.js
@@ -26,33 +26,38 @@

 /**
 * @interface
+ * @see https://dom.spec.whatwg.org/#interface-eventtarget
 */
 function EventTarget() {}

 /**
- * TODO(tbreisacher): Change the type of useCapture to be
- * {boolean|!EventListenerOptions}, here and in removeEventListener.
- *
 * @param {string} type
- * @param {EventListener|function(!Event):(boolean|undefined)} listener
- * @param {boolean} useCapture
+ * @param {EventListener|function(this:THIS, !Event):*} listener
+ * @param {(boolean|!AddEventListenerOptions)=} opt_options
 * @return {undefined}
+ * @this {THIS}
+ * @template THIS
+ * @see https://dom.spec.whatwg.org/#dom-eventtarget-addeventlistener
 */
-EventTarget.prototype.addEventListener = function(type, listener, useCapture)
-    {};
+EventTarget.prototype.addEventListener = function(type, listener, opt_options) {
+};

 /**
 * @param {string} type
- * @param {EventListener|function(!Event):(boolean|undefined)} listener
- * @param {boolean} useCapture
+ * @param {EventListener|function(this:THIS, !Event):*} listener
+ * @param {(boolean|!EventListenerOptions)=} opt_options
 * @return {undefined}
+ * @this {THIS}
+ * @template THIS
+ * @see https://dom.spec.whatwg.org/#dom-eventtarget-removeeventlistener
 */
-EventTarget.prototype.removeEventListener = function(type, listener, useCapture)
-    {};
+EventTarget.prototype.removeEventListener = function(
+    type, listener, opt_options) {};

 /**
 * @param {!Event} evt
 * @return {boolean}
+ * @see https://dom.spec.whatwg.org/#dom-eventtarget-dispatchevent
 */
 EventTarget.prototype.dispatchEvent = function(evt) {};

@@ -99,24 +104,23 @@ EventInit.prototype.composed;
 function Event(type, opt_eventInitDict) {}

 /**
- * @type {number}
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Events/ecma-script-binding.html
+ */
+Event.CAPTURING_PHASE;
+
+/**
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Events/ecma-script-binding.html
 */
 Event.AT_TARGET;

 /**
- * @type {number}
+ * @const {number}
 * @see http://www.w3.org/TR/DOM-Level-2-Events/ecma-script-binding.html
 */
 Event.BUBBLING_PHASE;

-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Events/ecma-script-binding.html
- */
-Event.CAPTURING_PHASE;
-
-
 /** @type {string} */
 Event.prototype.type;

@@ -163,8 +167,8 @@ Event.prototype.preventDefault = function() {};

 /**
 * @param {string} eventTypeArg
- * @param {boolean} canBubbleArg
- * @param {boolean} cancelableArg
+ * @param {boolean=} canBubbleArg
+ * @param {boolean=} cancelableArg
 * @return {undefined}
 */
 Event.prototype.initEvent = function(eventTypeArg, canBubbleArg, cancelableArg) {};
@@ -172,18 +176,20 @@ Event.prototype.initEvent = function(eventTypeArg, canBubbleArg, cancelableArg)
 /**
 * @record
 * @extends {EventInit}
+ * @template T
 * @see https://dom.spec.whatwg.org/#dictdef-customeventinit
 */
 function CustomEventInit() {}

-/** @type {(*|undefined)} */
+/** @type {(T|undefined)} */
 CustomEventInit.prototype.detail;

 /**
 * @constructor
 * @extends {Event}
 * @param {string} type
- * @param {CustomEventInit=} opt_eventInitDict
+ * @param {CustomEventInit<T>=} opt_eventInitDict
+ * @template T
 * @see http://www.w3.org/TR/DOM-Level-3-Events/#interface-CustomEvent
 */
 function CustomEvent(type, opt_eventInitDict) {}
@@ -192,14 +198,14 @@ function CustomEvent(type, opt_eventInitDict) {}
 * @param {string} eventType
 * @param {boolean} bubbles
 * @param {boolean} cancelable
- * @param {*} detail
+ * @param {T} detail
 * @return {undefined}
 */
 CustomEvent.prototype.initCustomEvent = function(
    eventType, bubbles, cancelable, detail) {};

 /**
- * @type {*}
+ * @type {T}
 */
 CustomEvent.prototype.detail;

@@ -430,6 +436,7 @@ KeyboardEventInit.prototype.char;
 KeyboardEventInit.prototype.locale;

 /**
+ * @see https://w3c.github.io/uievents/#idl-keyboardevent
 * @constructor
 * @extends {UIEvent}
 * @param {string} type
@@ -452,6 +459,18 @@ KeyboardEvent.prototype.altKey;
 /** @type {boolean} */
 KeyboardEvent.prototype.metaKey;

+/** @type {number} */
+KeyboardEvent.DOM_KEY_LOCATION_STANDARD;
+
+/** @type {number} */
+KeyboardEvent.DOM_KEY_LOCATION_LEFT;
+
+/** @type {number} */
+KeyboardEvent.DOM_KEY_LOCATION_RIGHT;
+
+/** @type {number} */
+KeyboardEvent.DOM_KEY_LOCATION_NUMPAD;
+
 /**
 * @param {string} keyIdentifierArg
 * @return {boolean}
@@ -552,3 +571,33 @@ InputEvent.prototype.inputType;

 /** @type {?DataTransfer} */
 InputEvent.prototype.dataTransfer;
+
+
+/**
+ * @record
+ * @extends {EventInit}
+ * @see https://html.spec.whatwg.org/multipage/webappapis.html#promiserejectioneventinit
+ */
+function PromiseRejectionEventInit() {}
+
+/** @type {undefined|!Promise<*>} */
+PromiseRejectionEventInit.prototype.promise;
+
+/** @type {*} */
+PromiseRejectionEventInit.prototype.reason;
+
+
+/**
+ * @constructor
+ * @extends {Event}
+ * @param {string} type
+ * @param {PromiseRejectionEventInit=} eventInitDict
+ * @see https://html.spec.whatwg.org/multipage/webappapis.html#promiserejectionevent
+ */
+function PromiseRejectionEvent(type, eventInitDict) {}
+
+/** @type {!Promise<*>} */
+PromiseRejectionEvent.prototype.promise;
+
+/** @type {*} */
+PromiseRejectionEvent.prototype.reason;
--- a/javascript/externs/web/w3c_eventsource.js
+++ b/javascript/externs/web/w3c_eventsource.js
@@ -0,0 +1,110 @@
+/*
+ * Copyright 2012 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's EventSource API.
+ * @see https://html.spec.whatwg.org/multipage/server-sent-events.html#server-sent-events
+ *
+ * @externs
+ */
+
+/** @record */
+function EventSourceInit() {};
+
+/** @type {(boolean|undefined)} */
+EventSourceInit.prototype.withCredentials;
+
+/**
+ * @constructor
+ * @implements {EventTarget}
+ * @param {string} url
+ * @param {EventSourceInit=} opt_eventSourceInitDict
+ */
+function EventSource(url, opt_eventSourceInitDict) {}
+
+/** @override */
+EventSource.prototype.addEventListener = function(type, listener, opt_options) {
+};
+
+/** @override */
+EventSource.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
+EventSource.prototype.dispatchEvent = function(evt) {};
+
+/**
+ * @const {string}
+ */
+EventSource.prototype.url;
+
+/** @const {boolean} */
+EventSource.prototype.withCredentials;
+
+/**
+ * @const {number}
+ */
+EventSource.prototype.CONNECTING;
+
+/**
+ * @const {number}
+ */
+EventSource.CONNECTING;
+
+/**
+ * @const {number}
+ */
+EventSource.prototype.OPEN;
+
+/**
+ * @const {number}
+ */
+EventSource.OPEN;
+
+/**
+ * @const {number}
+ */
+EventSource.prototype.CLOSED;
+
+/**
+ * @const {number}
+ */
+EventSource.CLOSED;
+
+/**
+ * @const {number}
+ */
+EventSource.prototype.readyState;
+
+/**
+ * @type {?function(!Event): void}
+ */
+EventSource.prototype.onopen = function(e) {};
+
+/**
+ * @type {?function(!MessageEvent<string>): void}
+ */
+EventSource.prototype.onmessage = function(e) {};
+
+/**
+ * @type {?function(!Event): void}
+ */
+EventSource.prototype.onerror = function(e) {};
+
+/**
+ * @return {undefined}
+ */
+EventSource.prototype.close = function() {};
--- a/javascript/externs/web/w3c_fileapi.js
+++ b/javascript/externs/web/w3c_fileapi.js
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2010 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview Definitions for objects in the File API, File Writer API, and
+ * File System API. Details of the API are at:
+ * http://www.w3.org/TR/FileAPI/
+ *
+ * @externs
+ */
+
+/** @record */
+function BlobPropertyBag() {};
+
+/** @type {(string|undefined)} */
+BlobPropertyBag.prototype.type;
+
+/**
+ * @see http://dev.w3.org/2006/webapi/FileAPI/#dfn-Blob
+ * @param {Array<ArrayBuffer|ArrayBufferView|Blob|string>=} opt_blobParts
+ * @param {BlobPropertyBag=} opt_options
+ * @constructor
+ * @nosideeffects
+ */
+function Blob(opt_blobParts, opt_options) {}
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-size
+ * @type {number}
+ */
+Blob.prototype.size;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-type
+ * @type {string}
+ */
+Blob.prototype.type;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-slice
+ * @param {number=} start
+ * @param {number=} length
+ * @param {string=} opt_contentType
+ * @return {!Blob}
+ * @nosideeffects
+ */
+Blob.prototype.slice = function(start, length, opt_contentType) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#arraybuffer-method-algo
+ * @return {!Promise<!ArrayBuffer>}
+ * @nosideeffects
+ */
+Blob.prototype.arrayBuffer = function() {};
+
+/**
+ * @see https://www.w3.org/TR/FileAPI/#dom-blob-text
+ * @return {!Promise<string>}
+ * @nosideeffects
+ */
+Blob.prototype.text = function() {};
+
+
+/**
+ * @record
+ * @extends {BlobPropertyBag}
+ **/
+function FilePropertyBag() {};
+
+/** @type {(number|undefined)} */
+FilePropertyBag.prototype.lastModified;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-file
+ * @param {!Array<string|!Blob|!ArrayBuffer>=} contents
+ * @param {string=} name
+ * @param {FilePropertyBag=} properties
+ * @constructor
+ * @extends {Blob}
+ */
+function File(contents, name, properties) {}
+
+/**
+ * Chrome uses this instead of name.
+ * @deprecated Use name instead.
+ * @type {string}
+ */
+File.prototype.fileName;
+
+/**
+ * Chrome uses this instead of size.
+ * @deprecated Use size instead.
+ * @type {string}
+ */
+File.prototype.fileSize;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-name
+ * @type {string}
+ */
+File.prototype.name;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-lastModifiedDate
+ * @type {Date}
+ */
+File.prototype.lastModifiedDate;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-lastModified
+ * @type {number}
+ */
+File.prototype.lastModified;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-filereader
+ * @constructor
+ * @implements {EventTarget}
+ */
+function FileReader() {}
+
+/** @override */
+FileReader.prototype.addEventListener = function(type, listener, opt_options) {
+};
+
+/** @override */
+FileReader.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
+FileReader.prototype.dispatchEvent = function(evt) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsArrayBuffer
+ * @param {!Blob} blob
+ * @return {undefined}
+ */
+FileReader.prototype.readAsArrayBuffer = function(blob) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsBinaryStringAsync
+ * @param {!Blob} blob
+ * @return {undefined}
+ */
+FileReader.prototype.readAsBinaryString = function(blob) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsText
+ * @param {!Blob} blob
+ * @param {string=} encoding
+ * @return {undefined}
+ */
+FileReader.prototype.readAsText = function(blob, encoding) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsDataURL
+ * @param {!Blob} blob
+ * @return {undefined}
+ */
+FileReader.prototype.readAsDataURL = function(blob) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-abort
+ * @return {undefined}
+ */
+FileReader.prototype.abort = function() {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-empty
+ * @const {number}
+ */
+FileReader.prototype.EMPTY;
+
+/** @const {number} */
+FileReader.EMPTY;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-loading
+ * @const {number}
+ */
+FileReader.prototype.LOADING;
+
+/** @const {number} */
+FileReader.LOADING;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-done
+ * @const {number}
+ */
+FileReader.prototype.DONE;
+
+/** @const {number} */
+FileReader.DONE;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readystate
+ * @type {number}
+ */
+FileReader.prototype.readyState;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-result
+ * @type {string|Blob|ArrayBuffer}
+ */
+FileReader.prototype.result;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-error
+ * @type {DOMError}
+ */
+FileReader.prototype.error;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onloadstart
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onloadstart;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onprogress
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onprogress;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onload
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onload;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onabort
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onabort;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onerror
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onerror;
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-onloadend
+ * @type {?function(!ProgressEvent<!FileReader>)}
+ */
+FileReader.prototype.onloadend;
+
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#FileReaderSyncSync
+ * @constructor
+ */
+function FileReaderSync() {}
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsArrayBufferSync
+ * @param {!Blob} blob
+ * @return {!ArrayBuffer}
+ */
+FileReaderSync.prototype.readAsArrayBuffer = function(blob) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsBinaryStringSync
+ * @param {!Blob} blob
+ * @return {string}
+ */
+FileReaderSync.prototype.readAsBinaryString = function(blob) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsTextSync
+ * @param {!Blob} blob
+ * @param {string=} encoding
+ * @return {string}
+ */
+FileReaderSync.prototype.readAsText = function(blob, encoding) {};
+
+/**
+ * @see http://www.w3.org/TR/FileAPI/#dfn-readAsDataURLSync
+ * @param {!Blob} blob
+ * @return {string}
+ */
+FileReaderSync.prototype.readAsDataURL = function(blob) {};
--- a/javascript/externs/web/w3c_geolocation.js
+++ b/javascript/externs/web/w3c_geolocation.js
@@ -27,8 +27,18 @@
 function Geolocation() {}

 /**
- * @param {function(!GeolocationPosition)} successCallback
- * @param {(function(!GeolocationPositionError)|null)=} opt_errorCallback
+ * @typedef {function(!GeolocationPosition): void}
+ */
+var PositionCallback;
+
+/**
+ * @typedef {function(!GeolocationPositionError): void}
+ */
+var PositionErrorCallback;
+
+/**
+ * @param {PositionCallback} successCallback
+ * @param {PositionErrorCallback=} opt_errorCallback
 * @param {GeolocationPositionOptions=} opt_options
 * @return {undefined}
 */
@@ -37,8 +47,8 @@ Geolocation.prototype.getCurrentPosition = function(successCallback,
                                                       opt_options) {};

 /**
- * @param {function(!GeolocationPosition)} successCallback
- * @param {(function(!GeolocationPositionError)|null)=} opt_errorCallback
+ * @param {PositionCallback} successCallback
+ * @param {PositionErrorCallback=} opt_errorCallback
 * @param {GeolocationPositionOptions=} opt_options
 * @return {number}
 */
@@ -54,7 +64,7 @@ Geolocation.prototype.clearWatch = function(watchId) {};


 /**
- * @constructor
+ * @record
 * @see http://www.w3.org/TR/geolocation-API/#coordinates
 */
 function GeolocationCoordinates() {}
@@ -64,24 +74,24 @@ GeolocationCoordinates.prototype.latitude;
 GeolocationCoordinates.prototype.longitude;
 /** @type {number} */
 GeolocationCoordinates.prototype.accuracy;
-/** @type {number} */
+/** @type {number|null} */
 GeolocationCoordinates.prototype.altitude;
-/** @type {number} */
+/** @type {number|null} */
 GeolocationCoordinates.prototype.altitudeAccuracy;
-/** @type {number} */
+/** @type {number|null} */
 GeolocationCoordinates.prototype.heading;
-/** @type {number} */
+/** @type {number|null} */
 GeolocationCoordinates.prototype.speed;


 /**
- * @constructor
+ * @record
 * @see http://www.w3.org/TR/geolocation-API/#position
 */
 function GeolocationPosition() {}
 /** @type {GeolocationCoordinates} */
 GeolocationPosition.prototype.coords;
-/** @type {Date} */
+/** @type {number} */
 GeolocationPosition.prototype.timestamp;


@@ -99,7 +109,7 @@ GeolocationPositionOptions.prototype.timeout;


 /**
- * @constructor
+ * @record
 * @see http://www.w3.org/TR/geolocation-API/#position-error
 */
 function GeolocationPositionError() {}
@@ -107,13 +117,13 @@ function GeolocationPositionError() {}
 GeolocationPositionError.prototype.code;
 /** @type {string} */
 GeolocationPositionError.prototype.message;
-/** @type {number} */
+/** @const {number} */
 GeolocationPositionError.prototype.UNKNOWN_ERROR;
-/** @type {number} */
+/** @const {number} */
 GeolocationPositionError.prototype.PERMISSION_DENIED;
-/** @type {number} */
+/** @const {number} */
 GeolocationPositionError.prototype.POSITION_UNAVAILABLE;
-/** @type {number} */
+/** @const {number} */
 GeolocationPositionError.prototype.TIMEOUT;

 /** @type {Geolocation} */
--- a/javascript/externs/web/w3c_geometry1.js
+++ b/javascript/externs/web/w3c_geometry1.js
@@ -0,0 +1,899 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Geometry Interfaces Module Level 1 spec.
+ *  The whole file has been fully type annotated. Created from
+ *  https://www.w3.org/TR/geometry-1/
+ *
+ * @externs
+ */
+
+/**
+ * @deprecated ClientRect has been replaced by DOMRect in the latest spec.
+ * @constructor
+ * @see https://www.w3.org/TR/cssom-view/#changes-from-2011-08-04
+ */
+function ClientRect() {}
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-top
+ */
+ClientRect.prototype.top;
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-right
+ */
+ClientRect.prototype.right;
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-bottom
+ */
+ClientRect.prototype.bottom;
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-left
+ */
+ClientRect.prototype.left;
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-width
+ */
+ClientRect.prototype.width;
+
+/**
+ * @type {number}
+ * @see http://www.w3.org/TR/cssom-view/#dom-clientrect-height
+ */
+ClientRect.prototype.height;
+
+/**
+ * @constructor
+ * @extends {ClientRect} for backwards compatibility
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} width
+ * @param {number=} height
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-domrectreadonly
+ */
+function DOMRectReadOnly(x, y, width, height) {}
+
+/**
+ * @param {!DOMRectInit} other
+ * @return {!DOMRectReadOnly}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-fromrect
+ */
+DOMRectReadOnly.prototype.fromRect = function(other) {};
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-x
+ */
+DOMRectReadOnly.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-y
+ */
+DOMRectReadOnly.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-width
+ */
+DOMRectReadOnly.prototype.width;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-height
+ */
+DOMRectReadOnly.prototype.height;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-top
+ */
+DOMRectReadOnly.prototype.top;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-right
+ */
+DOMRectReadOnly.prototype.right;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-bottom
+ */
+DOMRectReadOnly.prototype.bottom;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-left
+ */
+DOMRectReadOnly.prototype.left;
+
+/**
+ * @constructor
+ * @extends {DOMRectReadOnly}
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} width
+ * @param {number=} height
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrect-domrect
+ */
+function DOMRect(x, y, width, height) {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrect-x
+ */
+DOMRect.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrect-y
+ */
+DOMRect.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrect-width
+ */
+DOMRect.prototype.width;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrect-height
+ */
+DOMRect.prototype.height;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-top
+ */
+DOMRect.prototype.top;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-right
+ */
+DOMRect.prototype.right;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-bottom
+ */
+DOMRect.prototype.bottom;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectreadonly-left
+ */
+DOMRect.prototype.left;
+
+/**
+ * @constructor
+ * @see https://www.w3.org/TR/geometry-1/#dictdef-domrectinit
+ */
+function DOMRectInit() {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectinit-x
+ */
+DOMRectInit.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectinit-y
+ */
+DOMRectInit.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectinit-width
+ */
+DOMRectInit.prototype.width;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-domrectinit-height
+ */
+DOMRectInit.prototype.height;
+
+/**
+ * @constructor
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} z
+ * @param {number=} w
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-dompointreadonly
+ */
+function DOMPointReadOnly(x, y, z, w) {}
+
+/**
+ * @param {!DOMPointInit} other
+ * @return {!DOMPointReadOnly}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-frompoint
+ */
+DOMPointReadOnly.prototype.fromPoint = function(other) {};
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-x
+ */
+DOMPointReadOnly.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-y
+ */
+DOMPointReadOnly.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-z
+ */
+DOMPointReadOnly.prototype.z;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointreadonly-w
+ */
+DOMPointReadOnly.prototype.w;
+
+/**
+ * @constructor
+ * @extends {DOMPointReadOnly}
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} z
+ * @param {number=} w
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompoint-dompoint
+ */
+function DOMPoint(x, y, z, w) {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompoint-x
+ */
+DOMPoint.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompoint-y
+ */
+DOMPoint.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompoint-z
+ */
+DOMPoint.prototype.z;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompoint-w
+ */
+DOMPoint.prototype.w;
+
+/**
+ * @record
+ * @see https://www.w3.org/TR/geometry-1/#dictdef-dompointinit
+ */
+function DOMPointInit() {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointinit-x
+ */
+DOMPointInit.prototype.x;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointinit-y
+ */
+DOMPointInit.prototype.y;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointinit-z
+ */
+DOMPointInit.prototype.z;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dompointinit-w
+ */
+DOMPointInit.prototype.w;
+
+/**
+ * @constructor
+ * @implements {DOMMatrixInit}
+ * @param {string|Array<number>} init
+ * @see https://www.w3.org/TR/geometry-1/#dommatrixreadonly
+ */
+function DOMMatrixReadOnly(init) {}
+
+/**
+ * @param {!DOMMatrixInit} other
+ * @return {!DOMMatrixReadOnly}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-frommatrix
+ */
+DOMMatrixReadOnly.fromMatrix = function(other) {};
+
+/**
+ * @param {!Float32Array} array32
+ * @return {!DOMMatrixReadOnly}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-fromfloat32array
+ */
+DOMMatrixReadOnly.fromFloat32Array = function(array32) {};
+
+/**
+ * @param {!Float64Array} array64
+ * @return {!DOMMatrixReadOnly}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-fromfloat64array
+ */
+DOMMatrixReadOnly.fromFloat64Array = function(array64) {};
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-a
+ */
+DOMMatrixReadOnly.prototype.a;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-b
+ */
+DOMMatrixReadOnly.prototype.b;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-c
+ */
+DOMMatrixReadOnly.prototype.c;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-d
+ */
+DOMMatrixReadOnly.prototype.d;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-e
+ */
+DOMMatrixReadOnly.prototype.e;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-f
+ */
+DOMMatrixReadOnly.prototype.f;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m11
+ */
+DOMMatrixReadOnly.prototype.m11;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m12
+ */
+DOMMatrixReadOnly.prototype.m12;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m13
+ */
+DOMMatrixReadOnly.prototype.m13;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m14
+ */
+DOMMatrixReadOnly.prototype.m14;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m21
+ */
+DOMMatrixReadOnly.prototype.m21;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m22
+ */
+DOMMatrixReadOnly.prototype.m22;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m23
+ */
+DOMMatrixReadOnly.prototype.m23;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m24
+ */
+DOMMatrixReadOnly.prototype.m24;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m31
+ */
+DOMMatrixReadOnly.prototype.m31;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m32
+ */
+DOMMatrixReadOnly.prototype.m32;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m33
+ */
+DOMMatrixReadOnly.prototype.m33;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m34
+ */
+DOMMatrixReadOnly.prototype.m34;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m41
+ */
+DOMMatrixReadOnly.prototype.m41;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m42
+ */
+DOMMatrixReadOnly.prototype.m42;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m43
+ */
+DOMMatrixReadOnly.prototype.m43;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-m44
+ */
+DOMMatrixReadOnly.prototype.m44;
+
+/**
+ * @type {boolean}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-is2d
+ */
+DOMMatrixReadOnly.prototype.is2D;
+
+/**
+ * @type {boolean}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-isidentity
+ */
+DOMMatrixReadOnly.prototype.isIdentity;
+
+/**
+ * @param {number=} tx
+ * @param {number=} ty
+ * @param {number=} tz
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-translate
+ */
+DOMMatrixReadOnly.prototype.translate = function(tx, ty, tz) {};
+
+/**
+ * @param {number=} scaleX
+ * @param {number=} scaleY
+ * @param {number=} scaleZ
+ * @param {number=} originX
+ * @param {number=} originY
+ * @param {number=} originZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-scale
+ */
+DOMMatrixReadOnly.prototype.scale = function(
+    scaleX, scaleY, scaleZ, originX, originY, originZ) {};
+
+/**
+ * @param {number=} scaleX
+ * @param {number=} scaleY
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-scalenonuniform
+ */
+DOMMatrixReadOnly.prototype.scaleNonUniform = function(scaleX, scaleY) {};
+
+/**
+ * @param {number=} scale
+ * @param {number=} originX
+ * @param {number=} originY
+ * @param {number=} originZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-scale3d
+ */
+DOMMatrixReadOnly.prototype.scale3d = function(
+    scale, originX, originY, originZ) {};
+
+/**
+ * @param {number=} rotX
+ * @param {number=} rotY
+ * @param {number=} rotZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-rotate
+ */
+DOMMatrixReadOnly.prototype.rotate = function(rotX, rotY, rotZ) {};
+
+/**
+ * @param {number=} x
+ * @param {number=} y
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-rotatefromvector
+ */
+DOMMatrixReadOnly.prototype.rotateFromVector = function(x, y) {};
+
+/**
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} z
+ * @param {number=} angle
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-rotateaxisangle
+ */
+DOMMatrixReadOnly.prototype.rotateAxisAngle = function(x, y, z, angle) {};
+
+/**
+ * @param {number=} sx
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-skewx
+ */
+DOMMatrixReadOnly.prototype.skewX = function(sx) {};
+
+/**
+ * @param {number=} sy
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-skewy
+ */
+DOMMatrixReadOnly.prototype.skewY = function(sy) {};
+
+/**
+ * @param {!DOMMatrixInit} other
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-multiply
+ */
+DOMMatrixReadOnly.prototype.multiply = function(other) {};
+
+/**
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-flipx
+ */
+DOMMatrixReadOnly.prototype.flipX = function() {};
+
+/**
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-flipy
+ */
+DOMMatrixReadOnly.prototype.flipY = function() {};
+
+/**
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-inverse
+ */
+DOMMatrixReadOnly.prototype.inverse = function() {};
+
+/**
+ * @param {!DOMPointInit} point
+ * @return {!DOMPoint}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-transformpoint
+ */
+DOMMatrixReadOnly.prototype.transformPoint = function(point) {};
+
+/**
+ * @return {!Float32Array}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-tofloat32array
+ */
+DOMMatrixReadOnly.prototype.toFloat32Array = function() {};
+
+/**
+ * @return {!Float64Array}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixreadonly-tofloat64array
+ */
+DOMMatrixReadOnly.prototype.toFloat64Array = function() {};
+
+/**
+ * @constructor
+ * @extends {DOMMatrixReadOnly}
+ * @param {string|Array<number>} init
+ * @see https://www.w3.org/TR/geometry-1/#dommatrix
+ */
+function DOMMatrix(init) {}
+
+/**
+ * @param {!DOMMatrixInit} other
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-frommatrix
+ */
+DOMMatrix.fromMatrix = function(other) {};
+
+/**
+ * @param {!Float32Array} array32
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-fromfloat32array
+ */
+DOMMatrix.fromFloat32Array = function(array32) {};
+
+/**
+ * @param {!Float64Array} array64
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-fromfloat64array
+ */
+DOMMatrix.fromFloat64Array = function(array64) {};
+
+/**
+ * @param {!DOMMatrixInit} other
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-multiply
+ */
+DOMMatrix.prototype.multiplySelf = function(other) {};
+
+/**
+ * @param {!DOMMatrixInit} other
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-premultiply
+ */
+DOMMatrix.prototype.preMultiplySelf = function(other) {};
+
+/**
+ * @param {number=} tx
+ * @param {number=} ty
+ * @param {number=} tz
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-translate
+ */
+DOMMatrix.prototype.translateSelf = function(tx, ty, tz) {};
+
+/**
+ * @param {number=} scaleX
+ * @param {number=} scaleY
+ * @param {number=} scaleZ
+ * @param {number=} originX
+ * @param {number=} originY
+ * @param {number=} originZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-scale
+ */
+DOMMatrix.prototype.scaleSelf = function(
+    scaleX, scaleY, scaleZ, originX, originY, originZ) {};
+
+/**
+ * @param {number=} scale
+ * @param {number=} originX
+ * @param {number=} originY
+ * @param {number=} originZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-scale3d
+ */
+DOMMatrix.prototype.scale3dSelf = function(scale, originX, originY, originZ) {};
+
+/**
+ * @param {number=} rotX
+ * @param {number=} rotY
+ * @param {number=} rotZ
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-rotate
+ */
+DOMMatrix.prototype.rotateSelf = function(rotX, rotY, rotZ) {};
+
+/**
+ * @param {number=} x
+ * @param {number=} y
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-rotatefromvector
+ */
+DOMMatrix.prototype.rotateFromVectorSelf = function(x, y) {};
+
+/**
+ * @param {number=} x
+ * @param {number=} y
+ * @param {number=} z
+ * @param {number=} angle
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-rotateaxisangle
+ */
+DOMMatrix.prototype.rotateAxisAngleSelf = function(x, y, z, angle) {};
+
+/**
+ * @param {number=} sx
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-skewx
+ */
+DOMMatrix.prototype.skewXSelf = function(sx) {};
+
+/**
+ * @param {number=} sy
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-skewy
+ */
+DOMMatrix.prototype.skewYSelf = function(sy) {};
+
+/**
+ * @return {!DOMMatrix}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix-inverse
+ */
+DOMMatrix.prototype.inverseSelf = function() {};
+
+/**
+ * @record
+ * @see https://www.w3.org/TR/geometry-1/#dictdef-dommatrix2dinit
+ */
+function DOMMatrix2DInit() {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-a
+ */
+DOMMatrix2DInit.prototype.a;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-b
+ */
+DOMMatrix2DInit.prototype.b;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-c
+ */
+DOMMatrix2DInit.prototype.c;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-d
+ */
+DOMMatrix2DInit.prototype.d;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-e
+ */
+DOMMatrix2DInit.prototype.e;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-f
+ */
+DOMMatrix2DInit.prototype.f;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m11
+ */
+DOMMatrix2DInit.prototype.m11;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m12
+ */
+DOMMatrix2DInit.prototype.m12;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m21
+ */
+DOMMatrix2DInit.prototype.m21;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m22
+ */
+DOMMatrix2DInit.prototype.m22;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m41
+ */
+DOMMatrix2DInit.prototype.m41;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrix2dinit-m42
+ */
+DOMMatrix2DInit.prototype.m42;
+
+/**
+ * @record
+ * @extends {DOMMatrix2DInit}
+ * @see https://www.w3.org/TR/geometry-1/#dictdef-dommatrix
+ */
+function DOMMatrixInit() {}
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m13
+ */
+DOMMatrixInit.prototype.m13;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m14
+ */
+DOMMatrixInit.prototype.m14;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m23
+ */
+DOMMatrixInit.prototype.m23;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m24
+ */
+DOMMatrixInit.prototype.m24;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m31
+ */
+DOMMatrixInit.prototype.m31;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m32
+ */
+DOMMatrixInit.prototype.m32;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m33
+ */
+DOMMatrixInit.prototype.m33;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m34
+ */
+DOMMatrixInit.prototype.m34;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m43
+ */
+DOMMatrixInit.prototype.m43;
+
+/**
+ * @type {number}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-m44
+ */
+DOMMatrixInit.prototype.m44;
+
+/**
+ * @type {boolean}
+ * @see https://www.w3.org/TR/geometry-1/#dom-dommatrixinit-is2d
+ */
+DOMMatrixInit.prototype.is2D;
--- a/javascript/externs/web/w3c_indexeddb.js
+++ b/javascript/externs/web/w3c_indexeddb.js
--- a/javascript/externs/web/w3c_keyboardlock.js
+++ b/javascript/externs/web/w3c_keyboardlock.js
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2020 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for the W3C Keyboard Lock API.
+ * @see https://wicg.github.io/keyboard-lock/
+ * @externs
+ */
+
+/**
+ * Keyboard API object.
+ * @constructor
+ * @see https://w3c.github.io/keyboard-lock/#keyboard-interface
+ */
+function Keyboard() {}
+
+/**
+ * Lock the specified keys for this page, or all keys if keyCodes is omitted.
+ * @param {?Array<string>=} keyCodes
+ * @return {!Promise<undefined>}
+ */
+Keyboard.prototype.lock = function(keyCodes) {};
+
+/**
+ * Unlock any locked keys.
+ */
+Keyboard.prototype.unlock = function() {};
+
+
+/**
+ * @type {!Keyboard}
+ * @see https://w3c.github.io/keyboard-lock/#API
+ */
+Navigator.prototype.keyboard;
--- a/javascript/externs/web/w3c_mediacapabilities.js
+++ b/javascript/externs/web/w3c_mediacapabilities.js
@@ -0,0 +1,206 @@
+/*
+ * Copyright 2019 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview MediaCapabilities externs.
+ * Based on {@link https://w3c.github.io/media-capabilities/ MC draft 6 November
+ * 2019}.
+ * @externs
+ */
+
+/**
+ * @typedef {string}
+ * @see https://w3c.github.io/media-capabilities/#enumdef-hdrmetadatatype
+ */
+var HdrMetadataType;
+
+/**
+ * @typedef {string}
+ * @see https://w3c.github.io/media-capabilities/#enumdef-colorgamut
+ */
+var ColorGamut;
+
+/**
+ * @typedef {string}
+ * @see https://w3c.github.io/media-capabilities/#enumdef-transferfunction
+ */
+var TransferFunction;
+
+/**
+ * @typedef {string}
+ * @see https://w3c.github.io/media-capabilities/#enumdef-mediadecodingtype
+ */
+var MediaDecodingType;
+
+/**
+ * @typedef {string}
+ * @see https://w3c.github.io/media-capabilities/#enumdef-mediaencodingtype
+ */
+var MediaEncodingType;
+
+/**
+ * @typedef {{
+ *   contentType: string,
+ *   width: number,
+ *   height: number,
+ *   bitrate: number,
+ *   framerate: number,
+ *   hasAlphaChannel: (boolean|undefined),
+ *   hdrMetadataType: (!HdrMetadataType|undefined),
+ *   colorGamut: (!ColorGamut|undefined),
+ *   transferFunction: (!TransferFunction|undefined)
+ * }}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-videoconfiguration
+ */
+var VideoConfiguration;
+
+// NOTE: channels definition below is not yet stable in the spec as of Dec 2019.
+// "The channels needs to be defined as a double (2.1, 4.1, 5.1, ...), an
+// unsigned short (number of channels) or as an enum value. The current
+// definition is a placeholder."
+/**
+ * @typedef {{
+ *   contentType: string,
+ *   channels: (*|undefined),
+ *   bitrate: (number|undefined),
+ *   samplerate: (number|undefined),
+ *   spatialRendering: (boolean|undefined)
+ * }}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-audioconfiguration
+ */
+var AudioConfiguration;
+
+// NOTE: encryptionScheme is not yet in the MC spec as of Dec 2019, but has
+// already landed in EME and should be in MC soon.
+// https://github.com/w3c/media-capabilities/issues/100
+/**
+ * @typedef {{
+ *   robustness: (string|undefined),
+ *   encryptionScheme: (string|undefined)
+ * }}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-keysystemtrackconfiguration
+ */
+var KeySystemTrackConfiguration;
+
+/**
+ * @typedef {{
+ *   keySystem: string,
+ *   initDataType: (string|undefined),
+ *   distinctiveIdentifier: (string|undefined),
+ *   persistentState: (string|undefined),
+ *   sessionTypes: (!Array<string>|undefined),
+ *   audio: (!KeySystemTrackConfiguration|undefined),
+ *   video: (!KeySystemTrackConfiguration|undefined)
+ * }}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitieskeysystemconfiguration
+ */
+var MediaCapabilitiesKeySystemConfiguration;
+
+/**
+ * @record
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediaconfiguration
+ */
+function MediaConfiguration() {}
+
+/** @type {!VideoConfiguration|undefined} */
+MediaConfiguration.prototype.video;
+
+/** @type {!AudioConfiguration|undefined} */
+MediaConfiguration.prototype.audio;
+
+/**
+ * @record
+ * @extends {MediaConfiguration}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediadecodingconfiguration
+ */
+function MediaDecodingConfiguration() {}
+
+/** @type {!MediaDecodingType} */
+MediaDecodingConfiguration.prototype.type;
+
+/** @type {!MediaCapabilitiesKeySystemConfiguration|undefined} */
+MediaDecodingConfiguration.prototype.keySystemConfiguration;
+
+/**
+ * @record
+ * @extends {MediaConfiguration}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediaencodingconfiguration
+ */
+function MediaEncodingConfiguration() {}
+
+/** @type {!MediaEncodingType} */
+MediaEncodingConfiguration.prototype.type;
+
+/**
+ * @record
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesinfo
+ */
+function MediaCapabilitiesInfo() {}
+
+/** @type {boolean} */
+MediaCapabilitiesInfo.prototype.supported;
+
+/** @type {boolean} */
+MediaCapabilitiesInfo.prototype.smooth;
+
+/** @type {boolean} */
+MediaCapabilitiesInfo.prototype.powerEfficient;
+
+/**
+ * @record
+ * @extends {MediaCapabilitiesInfo}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesdecodinginfo
+ */
+function MediaCapabilitiesDecodingInfo() {}
+
+/** @type {?MediaKeySystemAccess} */
+MediaCapabilitiesDecodingInfo.prototype.keySystemAccess;
+
+/** @type {!MediaDecodingConfiguration} */
+MediaCapabilitiesDecodingInfo.prototype.configuration;
+
+/**
+ * @record
+ * @extends {MediaCapabilitiesInfo}
+ * @see https://w3c.github.io/media-capabilities/#dictdef-mediacapabilitiesencodinginfo
+ */
+function MediaCapabilitiesEncodingInfo() {}
+
+/** @type {!MediaEncodingConfiguration} */
+MediaCapabilitiesEncodingInfo.prototype.configuration;
+
+/**
+ * @interface
+ * @see https://w3c.github.io/media-capabilities/#mediacapabilities
+ */
+function MediaCapabilities() {}
+
+/**
+ * @param {!MediaDecodingConfiguration} configuration
+ * @return {!Promise<!MediaCapabilitiesDecodingInfo>}
+ */
+MediaCapabilities.prototype.decodingInfo = function(configuration) {};
+
+/**
+ * @param {!MediaEncodingConfiguration} configuration
+ * @return {!Promise<!MediaCapabilitiesEncodingInfo>}
+ */
+MediaCapabilities.prototype.encodingInfo = function(configuration) {};
+
+/** @const {?MediaCapabilities} */
+Navigator.prototype.mediaCapabilities;
+
+/** @const {?MediaCapabilities} */
+WorkerNavigator.prototype.mediaCapabilities;
--- a/javascript/externs/web/w3c_navigation_timing.js
+++ b/javascript/externs/web/w3c_navigation_timing.js
@@ -58,6 +58,7 @@ function PerformanceEntry() {}
 /** @type {number} */ PerformanceEntry.prototype.duration;

 /**
+ * https://www.w3.org/TR/resource-timing-2/#performanceresourcetiming
 * @constructor
 * @extends {PerformanceEntry}
 */
@@ -75,27 +76,138 @@ PerformanceResourceTiming.prototype.secureConnectionStart;
 /** @type {number} */ PerformanceResourceTiming.prototype.responseStart;
 /** @type {number} */ PerformanceResourceTiming.prototype.responseEnd;
 /** @type {string} */ PerformanceResourceTiming.prototype.initiatorType;
+/** @type {number|undefined} */
+PerformanceResourceTiming.prototype.transferSize;
+/** @type {number|undefined} */
+PerformanceResourceTiming.prototype.encodedBodySize;
+/** @type {number|undefined} */
+PerformanceResourceTiming.prototype.decodedBodySize;
+/** @type {number|undefined} */
+PerformanceResourceTiming.prototype.workerStart;
+/** @type {string} */ PerformanceResourceTiming.prototype.nextHopProtocol;
+
+/**
+ * Possible values are 'navigate', 'reload', 'back_forward', and 'prerender'.
+ * See https://w3c.github.io/navigation-timing/#sec-performance-navigation-types
+ * @typedef {string}
+ */
+var NavigationType;
+
+/**
+ * https://w3c.github.io/navigation-timing/#sec-PerformanceNavigationTiming
+ * @constructor
+ * @extends {PerformanceResourceTiming}
+ */
+function PerformanceNavigationTiming() {}
+/** @type {number} */ PerformanceNavigationTiming.prototype.unloadEventStart;
+/** @type {number} */ PerformanceNavigationTiming.prototype.unloadEventEnd;
+/** @type {number} */ PerformanceNavigationTiming.prototype.domInteractive;
+/** @type {number} */ PerformanceNavigationTiming.prototype
+    .domContentLoadedEventStart;
+/** @type {number} */ PerformanceNavigationTiming.prototype
+    .domContentLoadedEventEnd;
+/** @type {number} */ PerformanceNavigationTiming.prototype.domComplete;
+/** @type {number} */ PerformanceNavigationTiming.prototype.loadEventStart;
+/** @type {number} */ PerformanceNavigationTiming.prototype.loadEventEnd;
+/** @type {NavigationType} */ PerformanceNavigationTiming.prototype.type;
+/** @type {number} */ PerformanceNavigationTiming.prototype.redirectCount;
+
+/**
+ * https://w3c.github.io/paint-timing/#sec-PerformancePaintTiming
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function PerformancePaintTiming() {}

 /** @constructor */
 function PerformanceNavigation() {}
-/** @type {number} */ PerformanceNavigation.prototype.TYPE_NAVIGATE = 0;
-/** @type {number} */ PerformanceNavigation.prototype.TYPE_RELOAD = 1;
-/** @type {number} */ PerformanceNavigation.prototype.TYPE_BACK_FORWARD = 2;
-/** @type {number} */ PerformanceNavigation.prototype.TYPE_RESERVED = 255;
+/** @const {number} */ PerformanceNavigation.TYPE_NAVIGATE;
+/** @const {number} */ PerformanceNavigation.prototype.TYPE_NAVIGATE;
+/** @const {number} */ PerformanceNavigation.TYPE_RELOAD;
+/** @const {number} */ PerformanceNavigation.prototype.TYPE_RELOAD;
+/** @const {number} */ PerformanceNavigation.TYPE_BACK_FORWARD;
+/** @const {number} */ PerformanceNavigation.prototype.TYPE_BACK_FORWARD;
+/** @const {number} */ PerformanceNavigation.TYPE_RESERVED;
+/** @const {number} */ PerformanceNavigation.prototype.TYPE_RESERVED;
 /** @type {number} */ PerformanceNavigation.prototype.type;
 /** @type {number} */ PerformanceNavigation.prototype.redirectCount;

-// Only available in WebKit, and only with the --enable-memory-info flag.
-/** @constructor */
-function PerformanceMemory() {}
-/** @type {number} */ PerformanceMemory.prototype.jsHeapSizeLimit;
-/** @type {number} */ PerformanceMemory.prototype.totalJSHeapSize;
-/** @type {number} */ PerformanceMemory.prototype.usedJSHeapSize;
+/**
+ * https://w3c.github.io/longtasks/#taskattributiontiming
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function TaskAttributionTiming() {}
+/** @type {string} */ TaskAttributionTiming.prototype.containerId;
+/** @type {string} */ TaskAttributionTiming.prototype.containerName;
+/** @type {string} */ TaskAttributionTiming.prototype.containerSrc;
+/** @type {string} */ TaskAttributionTiming.prototype.containerType;
+
+/**
+ * https://w3c.github.io/longtasks/#performancelongtasktiming
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function PerformanceLongTaskTiming() {}
+/** @type {!Array<!TaskAttributionTiming>} */
+PerformanceLongTaskTiming.prototype.attribution;
+
+/**
+ * https://wicg.github.io/layout-instability/#sec-layout-shift
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function LayoutShift() {}
+/** @type {number} */ LayoutShift.prototype.value;
+/** @type {boolean} */ LayoutShift.prototype.hadRecentInput;
+/** @type {number} */ LayoutShift.prototype.lastInputTime;
+/** @type {!Array<!LayoutShiftAttribution>} */ LayoutShift.prototype.sources;
+
+/**
+ * https://wicg.github.io/layout-instability/#sec-layout-shift
+ * @constructor
+ */
+function LayoutShiftAttribution() {}
+/** @type {?Node} */ LayoutShiftAttribution.prototype.node;
+/** @type {!DOMRectReadOnly} */ LayoutShiftAttribution.prototype.previousRect;
+/** @type {!DOMRectReadOnly} */ LayoutShiftAttribution.prototype.currentRect;
+
+/**
+ * https://wicg.github.io/largest-contentful-paint/#largestcontentfulpaint
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function LargestContentfulPaint() {}
+/** @type {number} */ LargestContentfulPaint.prototype.renderTime;
+/** @type {number} */ LargestContentfulPaint.prototype.loadTime;
+/** @type {number} */ LargestContentfulPaint.prototype.size;
+/** @type {string} */ LargestContentfulPaint.prototype.id;
+/** @type {string} */ LargestContentfulPaint.prototype.url;
+/** @type {?Element} */ LargestContentfulPaint.prototype.element;
+
+/**
+ * https://wicg.github.io/event-timing/#sec-performance-event-timing
+ * @constructor
+ * @extends {PerformanceEntry}
+ */
+function PerformanceEventTiming() {}
+/** @type {number} */ PerformanceEventTiming.prototype.processingStart;
+/** @type {number} */ PerformanceEventTiming.prototype.processingEnd;
+/** @type {boolean} */ PerformanceEventTiming.prototype.cancelable;
+/** @type {?Node} */ PerformanceEventTiming.prototype.target;

 /** @constructor */
 function Performance() {}
-/** @type {PerformanceTiming} */ Performance.prototype.timing;
-/** @type {PerformanceNavigation} */ Performance.prototype.navigation;
+
+/** @type {PerformanceTiming} */
+Performance.prototype.timing;
+
+/** @type {PerformanceNavigation} */
+Performance.prototype.navigation;
+
+/** @type {number} */
+Performance.prototype.timeOrigin;
+

 /**
 * Clears the buffer used to store the current list of
@@ -105,10 +217,10 @@ function Performance() {}
 Performance.prototype.clearResourceTimings = function() {};

 /**
- * Clear out the buffer of performance timing events for webkit browsers.
- * @return {undefined}
+ * A callback that is invoked when the resourcetimingbufferfull event is fired.
+ * @type {?function(Event)}
 */
-Performance.prototype.webkitClearResourceTimings = function() {};
+Performance.prototype.onresourcetimingbufferfull = function() {};

 /**
 * Set the maximum number of PerformanceResourceTiming resources that may be
@@ -119,46 +231,37 @@ Performance.prototype.webkitClearResourceTimings = function() {};
 Performance.prototype.setResourceTimingBufferSize = function(maxSize) {};

 /**
- * @return {Array<PerformanceEntry>} A copy of the PerformanceEntry list,
+ * @return {!Array<!PerformanceEntry>} A copy of the PerformanceEntry list,
 *     in chronological order with respect to startTime.
 * @nosideeffects
 */
 Performance.prototype.getEntries = function() {};

 /**
- * @param {string} entryType Only return {@code PerformanceEntry}s with this
+ * @param {string} entryType Only return `PerformanceEntry`s with this
 *     entryType.
- * @return {Array<PerformanceEntry>} A copy of the PerformanceEntry list,
+ * @return {!Array<!PerformanceEntry>} A copy of the PerformanceEntry list,
 *     in chronological order with respect to startTime.
 * @nosideeffects
 */
 Performance.prototype.getEntriesByType = function(entryType) {};

 /**
- * @param {string} name Only return {@code PerformanceEntry}s with this name.
- * @param {string=} opt_entryType Only return {@code PerformanceEntry}s with
+ * @param {string} name Only return `PerformanceEntry`s with this name.
+ * @param {string=} opt_entryType Only return `PerformanceEntry`s with
 *     this entryType.
- * @return {Array<PerformanceEntry>} PerformanceEntry list in chronological
+ * @return {!Array<!PerformanceEntry>} PerformanceEntry list in chronological
 *     order with respect to startTime.
 * @nosideeffects
 */
 Performance.prototype.getEntriesByName = function(name, opt_entryType) {};

-// Only available in WebKit, and only with the --enable-memory-info flag.
-/** @type {PerformanceMemory} */ Performance.prototype.memory;
-
 /**
 * @return {number}
 * @nosideeffects
 */
 Performance.prototype.now = function() {};

-/**
- * @return {number}
- * @nosideeffects
- */
-Performance.prototype.webkitNow = function() {};
-
 /**
 * @param {string} markName
 * @return {undefined}
@@ -177,8 +280,8 @@ Performance.prototype.clearMarks = function(opt_markName) {};
 * @param {string=} opt_endMark
 * @return {undefined}
 */
-Performance.prototype.measure =
-    function(measureName, opt_startMark, opt_endMark) {};
+Performance.prototype.measure = function(
+    measureName, opt_startMark, opt_endMark) {};

 /**
 * @param {string=} opt_measureName
@@ -194,3 +297,73 @@ Window.prototype.performance;
 * @suppress {duplicate}
 */
 var performance;
+
+/**
+ * @constructor
+ * @extends {Performance}
+ */
+function WorkerPerformance() {}
+
+/**
+ * @typedef {function(!PerformanceObserverEntryList, !PerformanceObserver): void}
+ */
+var PerformanceObserverCallback;
+
+/**
+ * See:
+ * https://w3c.github.io/performance-timeline/#the-performanceobserver-interface
+ * @constructor
+ * @param {!PerformanceObserverCallback} callback
+ */
+function PerformanceObserver(callback) {}
+
+/**
+ * @param {!PerformanceObserverInit} options
+ */
+PerformanceObserver.prototype.observe = function(options) {};
+
+/** @return {void} */
+PerformanceObserver.prototype.disconnect = function() {};
+
+/**
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver/takeRecords
+ * @see https://www.w3.org/TR/performance-timeline-2/#takerecords-method
+ * @return {!Array<!PerformanceEntry>} The current PerformanceEntry list stored
+ *     in the performance observer buffer, emptying it out.
+ */
+PerformanceObserver.prototype.takeRecords = function() {};
+
+/** @const {!Array<string>} */
+PerformanceObserver.prototype.supportedEntryTypes;
+
+/**
+ * @record
+ */
+function PerformanceObserverInit() {}
+
+/** @type {undefined|!Array<string>} */
+PerformanceObserverInit.prototype.entryTypes;
+/** @type {undefined|string} */
+PerformanceObserverInit.prototype.type;
+/** @type {undefined|boolean} */
+PerformanceObserverInit.prototype.buffered;
+
+/**
+ * @constructor
+ */
+function PerformanceObserverEntryList() {}
+
+/** @return {!Array<!PerformanceEntry>} */
+PerformanceObserverEntryList.prototype.getEntries = function() {};
+/**
+ * @param {string} type
+ * @return {!Array<!PerformanceEntry>}
+ */
+PerformanceObserverEntryList.prototype.getEntriesByName = function(type) {};
+/**
+ * @param {string} name
+ * @param {string=} opt_type
+ * @return {!Array<!PerformanceEntry>}
+ */
+PerformanceObserverEntryList.prototype.getEntriesByType = function(
+    name, opt_type) {};
--- a/javascript/externs/web/w3c_netinfo.js
+++ b/javascript/externs/web/w3c_netinfo.js
@@ -0,0 +1,85 @@
+/*
+ * Copyright 2017 The Closure Compiler Authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Externs for the Network Information API.
+ * @externs
+ */
+
+/**
+ * @see http://wicg.github.io/netinfo/#-dfn-networkinformation-dfn-interface
+ * @constructor
+ */
+function NetworkInformation() {}
+
+/** @type {ConnectionType} */
+NetworkInformation.prototype.type;
+
+/** @type {EffectiveConnectionType} */
+NetworkInformation.prototype.effectiveType;
+
+/** @type {Megabit} */
+NetworkInformation.prototype.downlinkMax;
+
+/** @type {Megabit} */
+NetworkInformation.prototype.downlink;
+
+/** @type {Millisecond} */
+NetworkInformation.prototype.rtt;
+
+/** @type {?function(Event)} */
+NetworkInformation.prototype.onchange;
+
+/** @type {boolean} */
+NetworkInformation.prototype.saveData;
+
+/**
+ * @typedef {number}
+ */
+var Megabit;
+
+/**
+ * @typedef {number}
+ */
+var Millisecond;
+
+/**
+ * Enum of:
+ * 'bluetooth',
+ * 'cellular',
+ * 'ethernet',
+ * 'mixed',
+ * 'none',
+ * 'other',
+ * 'unknown',
+ * 'wifi',
+ * 'wimax'
+ * @typedef {string}
+ */
+var ConnectionType;
+
+/**
+ * Enum of:
+ * '2g',
+ * '3g',
+ * '4g',
+ * 'slow-2g'
+ * @typedef {string}
+ */
+var EffectiveConnectionType;
+
+/** @type {!NetworkInformation} */
+Navigator.prototype.connection;
--- a/javascript/externs/web/w3c_payment_request.js
+++ b/javascript/externs/web/w3c_payment_request.js
@@ -0,0 +1,401 @@
+/*
+ * Copyright 2019 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Payment Request API.
+ * @see https://w3c.github.io/payment-request/
+ *
+ * @externs
+ */
+
+/**
+ * @constructor
+ * @param {!Array<!PaymentMethodData>} methodData
+ * @param {!PaymentDetailsInit} details
+ * @param {!PaymentOptions=} options
+ * @implements {EventTarget}
+ * @see https://w3c.github.io/payment-request/#paymentrequest-interface
+ */
+function PaymentRequest(methodData, details, options) {}
+/**
+ * @param {!Promise<!PaymentDetailsUpdate>=} detailsPromise
+ * @return {!Promise<!PaymentResponse>}
+ */
+PaymentRequest.prototype.show = function(detailsPromise) {};
+/** @return {!Promise<undefined>} */
+PaymentRequest.prototype.abort = function() {};
+/** @return {!Promise<boolean>} */
+PaymentRequest.prototype.canMakePayment = function() {};
+/** @return {!Promise<boolean>} */
+PaymentRequest.prototype.hasEnrolledInstrument = function() {};
+/** @const {string} */
+PaymentRequest.prototype.id;
+/** @const {?PaymentAddress} */
+PaymentRequest.prototype.shippingAddress;
+/** @const {?string} */
+PaymentRequest.prototype.shippingOption;
+/** @const {?string} */
+PaymentRequest.prototype.shippingType;
+/** @type {?function(!Event)} */
+PaymentRequest.prototype.onmerchantvalidation;
+/** @type {?function(!Event)} */
+PaymentRequest.prototype.onshippingaddresschange;
+/** @type {?function(!Event)} */
+PaymentRequest.prototype.onshippingoptionchange;
+/** @type {?function(!Event)} */
+PaymentRequest.prototype.onpaymentmethodchange;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentmethoddata-dictionary
+ */
+function PaymentMethodData() {};
+/** @type {string} */
+PaymentMethodData.prototype.supportedMethods;
+/** @type {!Object|undefined} */
+PaymentMethodData.prototype.data;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentcurrencyamount-dictionary
+ */
+function PaymentCurrencyAmount() {};
+/** @type {string} */
+PaymentCurrencyAmount.prototype.currency;
+/** @type {string} */
+PaymentCurrencyAmount.prototype.value;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentdetailsbase-dictionary
+ */
+function PaymentDetailsBase() {};
+/** @type {!Array<!PaymentItem>|undefined} */
+PaymentDetailsBase.prototype.displayItems;
+/** @type {!Array<!PaymentShippingOption>|undefined} */
+PaymentDetailsBase.prototype.shippingOptions;
+/** @type {!Array<!PaymentDetailsModifier>|undefined} */
+PaymentDetailsBase.prototype.modifiers;
+
+/**
+ * @extends {PaymentDetailsBase}
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentdetailsinit-dictionary
+ */
+function PaymentDetailsInit() {};
+/** @type {string|undefined} */
+PaymentDetailsInit.prototype.id;
+/** @type {!PaymentItem} */
+PaymentDetailsInit.prototype.total;
+
+/**
+ * @extends {PaymentDetailsBase}
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentdetailsupdate-dictionary
+ */
+function PaymentDetailsUpdate() {};
+/** @type {string|undefined} */
+PaymentDetailsUpdate.prototype.error;
+/** @type {!PaymentItem|undefined} */
+PaymentDetailsUpdate.prototype.total;
+/** @type {!AddressErrors|undefined} */
+PaymentDetailsUpdate.prototype.shippingAddressErrors;
+/** @type {!PayerErrors|undefined} */
+PaymentDetailsUpdate.prototype.payerErrors;
+/** @type {!Object|undefined} */
+PaymentDetailsUpdate.prototype.paymentMethodErrors;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentdetailsmodifier-dictionary
+ */
+function PaymentDetailsModifier() {};
+/** @type {string} */
+PaymentDetailsModifier.prototype.supportedMethods;
+/** @type {!PaymentItem|undefined} */
+PaymentDetailsModifier.prototype.total;
+/** @type {!Array<!PaymentItem>|undefined} */
+PaymentDetailsModifier.prototype.additionalDisplayItems;
+/** @type {!Object|undefined} */
+PaymentDetailsModifier.prototype.data;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentoptions-dictionary
+ */
+function PaymentOptions() {};
+/** @type {boolean|undefined} */
+PaymentOptions.prototype.requestPayerName;
+/** @type {boolean|undefined} */
+PaymentOptions.prototype.requestBillingAddress;
+/** @type {boolean|undefined} */
+PaymentOptions.prototype.requestPayerEmail;
+/** @type {boolean|undefined} */
+PaymentOptions.prototype.requestPayerPhone;
+/** @type {boolean|undefined} */
+PaymentOptions.prototype.requestShipping;
+/** @type {string|undefined} */
+PaymentOptions.prototype.shippingType;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentitem-dictionary
+ */
+function PaymentItem() {};
+/** @type {string} */
+PaymentItem.prototype.label;
+/** @type {!PaymentCurrencyAmount} */
+PaymentItem.prototype.amount;
+/** @type {boolean|undefined} */
+PaymentItem.prototype.pending;
+
+/**
+ * @interface
+ * @see https://w3c.github.io/payment-request/#paymentaddress-interface
+ */
+function PaymentAddress() {}
+/**
+ * @return {Object}
+ * @override
+ */
+PaymentAddress.prototype.toJSON = function() {};
+/** @const {string|undefined} */
+PaymentAddress.prototype.city;
+/** @const {string|undefined} */
+PaymentAddress.prototype.country;
+/** @const {string|undefined} */
+PaymentAddress.prototype.dependentLocality;
+/** @const {string|undefined} */
+PaymentAddress.prototype.organization;
+/** @const {string|undefined} */
+PaymentAddress.prototype.phone;
+/** @const {string|undefined} */
+PaymentAddress.prototype.postalCode;
+/** @const {string|undefined} */
+PaymentAddress.prototype.recipient;
+/** @const {string|undefined} */
+PaymentAddress.prototype.region;
+/** @const {string|undefined} */
+PaymentAddress.prototype.sortingCode;
+/** @const {!Array<string>|undefined} */
+PaymentAddress.prototype.addressLine;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#addressinit-dictionary
+ */
+function AddressInit() {};
+/** @type {string|undefined} */
+AddressInit.prototype.country;
+/** @type {!Array<string>|undefined} */
+AddressInit.prototype.addressLine;
+/** @type {string|undefined} */
+AddressInit.prototype.region;
+/** @type {string|undefined} */
+AddressInit.prototype.city;
+/** @type {string|undefined} */
+AddressInit.prototype.dependentLocality;
+/** @type {string|undefined} */
+AddressInit.prototype.postalCode;
+/** @type {string|undefined} */
+AddressInit.prototype.sortingCode;
+/** @type {string|undefined} */
+AddressInit.prototype.organization;
+/** @type {string|undefined} */
+AddressInit.prototype.recipient;
+/** @type {string|undefined} */
+AddressInit.prototype.phone;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#addresserrors-dictionary
+ */
+function AddressErrors() {};
+/** @type {string|undefined} */
+AddressErrors.prototype.addressLine;
+/** @type {string|undefined} */
+AddressErrors.prototype.city;
+/** @type {string|undefined} */
+AddressErrors.prototype.country;
+/** @type {string|undefined} */
+AddressErrors.prototype.dependentLocality;
+/** @type {string|undefined} */
+AddressErrors.prototype.organization;
+/** @type {string|undefined} */
+AddressErrors.prototype.phone;
+/** @type {string|undefined} */
+AddressErrors.prototype.postalCode;
+/** @type {string|undefined} */
+AddressErrors.prototype.recipient;
+/** @type {string|undefined} */
+AddressErrors.prototype.region;
+/** @type {string|undefined} */
+AddressErrors.prototype.sortingCode;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentshippingoption-dictionary
+ */
+function PaymentShippingOption() {};
+/** @type {string} */
+PaymentShippingOption.prototype.id;
+/** @type {string} */
+PaymentShippingOption.prototype.label;
+/** @type {!PaymentCurrencyAmount} */
+PaymentShippingOption.prototype.amount;
+/** @type {boolean|undefined} */
+PaymentShippingOption.prototype.selected;
+
+/**
+ * @constructor
+ * @implements {EventTarget}
+ * @see https://w3c.github.io/payment-request/#paymentresponse-interface
+ */
+function PaymentResponse() {}
+/**
+ * @return {!Object}
+ * @override
+ */
+PaymentResponse.prototype.toJSON = function() {};
+/** @const {string} */
+PaymentResponse.prototype.requestId;
+/** @const {string} */
+PaymentResponse.prototype.methodName;
+/** @const {!Object} */
+PaymentResponse.prototype.details;
+/** @const {?PaymentAddress} */
+PaymentResponse.prototype.shippingAddress;
+/** @const {?string} */
+PaymentResponse.prototype.shippingOption;
+/** @const {?string} */
+PaymentResponse.prototype.payerName;
+/** @const {?string} */
+PaymentResponse.prototype.payerEmail;
+/** @const {?string} */
+PaymentResponse.prototype.payerPhone;
+/**
+ * @param {string=} result
+ * @return {!Promise<undefined>}
+ */
+PaymentResponse.prototype.complete = function(result) {};
+/**
+ * @param {!PaymentValidationErrors=} errorFields
+ * @return {!Promise<undefined>}
+ */
+PaymentResponse.prototype.retry = function(errorFields) {};
+/** @type {?function(!Event)} */
+PaymentResponse.prototype.onpayerdetailchange;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentvalidationerrors-dictionary
+ */
+function PaymentValidationErrors() {};
+/** @type {!PayerErrors|undefined} */
+PaymentValidationErrors.prototype.payer;
+/** @type {!AddressErrors|undefined} */
+PaymentValidationErrors.prototype.shippingAddress;
+/** @type {string|undefined} */
+PaymentValidationErrors.prototype.error;
+/** @type {!Object|undefined} */
+PaymentValidationErrors.prototype.paymentMethod;
+
+/**
+ * @record
+ * @see https://w3c.github.io/payment-request/#payererrors-dictionary
+ */
+function PayerErrors() {};
+/** @type {string|undefined} */
+PayerErrors.prototype.email;
+/** @type {string|undefined} */
+PayerErrors.prototype.name;
+/** @type {string|undefined} */
+PayerErrors.prototype.phone;
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {!MerchantValidationEventInit=} eventInitDict
+ * @extends {Event}
+ * @see https://w3c.github.io/payment-request/#merchantvalidationevent-interface
+ */
+function MerchantValidationEvent(type, eventInitDict) {};
+/** @const {string} */
+MerchantValidationEvent.prototype.methodName;
+/** @const {string} */
+MerchantValidationEvent.prototype.validationURL;
+/**
+ * @param {!Promise<undefined>} merchantSessionPromise
+ * @return {undefined}
+ */
+MerchantValidationEvent.prototype.complete = function(
+    merchantSessionPromise) {};
+
+/**
+ * @extends {EventInit}
+ * @record
+ * @see https://w3c.github.io/payment-request/#merchantvalidationeventinit-dictionary
+ */
+function MerchantValidationEventInit() {};
+/** @type {string|undefined} */
+MerchantValidationEventInit.prototype.methodName;
+/** @type {string|undefined} */
+MerchantValidationEventInit.prototype.validationURL;
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {!PaymentMethodChangeEventInit=} eventInitDict
+ * @extends {PaymentRequestUpdateEvent}
+ * @see https://w3c.github.io/payment-request/#paymentmethodchangeevent-interface
+ */
+function PaymentMethodChangeEvent(type, eventInitDict) {};
+/** @const {string} */
+PaymentMethodChangeEvent.prototype.methodName;
+/** @const {?Object} */
+PaymentMethodChangeEvent.prototype.methodDetails;
+
+/**
+ * @extends {PaymentRequestUpdateEventInit}
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentmethodchangeeventinit-dictionary
+ */
+function PaymentMethodChangeEventInit() {};
+/** @type {string|undefined} */
+PaymentMethodChangeEventInit.prototype.methodName;
+/** @type {?Object|undefined} */
+PaymentMethodChangeEventInit.prototype.methodDetails;
+
+/**
+ * @constructor
+ * @param {string} type
+ * @param {!PaymentRequestUpdateEventInit=} eventInitDict
+ * @extends {Event}
+ * @see https://w3c.github.io/payment-request/#paymentrequestupdateevent-interface
+ */
+function PaymentRequestUpdateEvent(type, eventInitDict) {};
+/**
+ * @param {!Promise<!PaymentDetailsUpdate>} detailsPromise
+ * @return {undefined}
+ */
+PaymentRequestUpdateEvent.prototype.updateWith = function(detailsPromise) {};
+
+/**
+ * @extends {EventInit}
+ * @record
+ * @see https://w3c.github.io/payment-request/#paymentrequestupdateeventinit-dictionary
+ */
+function PaymentRequestUpdateEventInit() {};
--- a/javascript/externs/web/w3c_permissions.js
+++ b/javascript/externs/web/w3c_permissions.js
@@ -78,27 +78,15 @@ PermissionStatus.prototype.status;
 /** @type {?function(!Event)} */
 PermissionStatus.prototype.onchange;

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-PermissionStatus.prototype.addEventListener = function(type,
-                                                       listener,
-                                                       opt_useCapture) {};
+/** @override */
+PermissionStatus.prototype.addEventListener = function(
+    type, listener, opt_options) {};

-/**
- * @param {boolean=} opt_useCapture
- * @override
- * @return {undefined}
- */
-PermissionStatus.prototype.removeEventListener = function(type,
-                                                          listener,
-                                                          opt_useCapture) {};
-/**
- * @override
- * @return {boolean}
- */
+/** @override */
+PermissionStatus.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
 PermissionStatus.prototype.dispatchEvent = function(evt) {};


--- a/javascript/externs/web/w3c_pointer_events.js
+++ b/javascript/externs/web/w3c_pointer_events.js
@@ -42,6 +42,26 @@ Navigator.prototype.pointerEnabled;
 Navigator.prototype.maxTouchPoints;


+/**
+ * @param {number} pointerId
+ * @see https://www.w3.org/TR/pointerevents/#widl-Element-setPointerCapture-void-long-pointerId
+ */
+Element.prototype.setPointerCapture = function(pointerId) {};
+
+/**
+ * @param {number} pointerId
+ * @see https://www.w3.org/TR/pointerevents/#widl-Element-releasePointerCapture-void-long-pointerId
+ */
+Element.prototype.releasePointerCapture = function(pointerId) {};
+
+/**
+ * @param {number} pointerId
+ * @see https://www.w3.org/TR/pointerevents/#dom-element-haspointercapture
+ * @return {boolean}
+ */
+Element.prototype.hasPointerCapture = function(pointerId) {};
+
+
 /**
 * @record
 * @extends {MouseEventInit}
@@ -107,11 +127,18 @@ PointerEvent.prototype.pointerType;
 PointerEvent.prototype.isPrimary;

 // Microsoft pointerType values
-/** @type {string} */
+/** @const {string} */
 PointerEvent.prototype.MSPOINTER_TYPE_TOUCH;

-/** @type {string} */
+/** @const {string} */
 PointerEvent.prototype.MSPOINTER_TYPE_PEN;

-/** @type {string} */
+/** @const {string} */
 PointerEvent.prototype.MSPOINTER_TYPE_MOUSE;
+
+/**
+ * @see https://w3c.github.io/pointerevents/extension.html
+ * @return {!Array<!PointerEvent>}
+ */
+PointerEvent.prototype.getCoalescedEvents = function() {};
+
--- a/javascript/externs/web/w3c_pointerlock.js
+++ b/javascript/externs/web/w3c_pointerlock.js
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2015 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Pointer Lock API.
+ * @see https://w3c.github.io/pointerlock/
+ *
+ * @externs
+ */
+
+/**
+ * TODO(bradfordcsmith): update the link when PR is merged
+ * @see https://github.com/w3c/pointerlock/pull/49/
+ * @record
+ */
+function PointerLockOptions() {}
+
+/** @type {undefined|boolean} */
+PointerLockOptions.prototype.unadjustedMovement;
+
+/**
+ * @see https://w3c.github.io/pointerlock/#widl-Element-requestPointerLock-void
+ * @param {!PointerLockOptions=} options
+ * @return {void|!Promise<void>}
+ */
+Element.prototype.requestPointerLock = function(options) {};
+
+/**
+ * @see https://w3c.github.io/pointerlock/#widl-Document-pointerLockElement
+ * @type {?Element}
+ */
+Document.prototype.pointerLockElement;
+
+/**
+ * @see https://w3c.github.io/pointerlock/#widl-Document-exitPointerLock-void
+ * @return {void}
+ */
+Document.prototype.exitPointerLock = function() {};
+
+/**
+ * @see https://w3c.github.io/pointerlock/#widl-MouseEvent-movementX
+ * @type {number}
+ */
+MouseEvent.prototype.movementX;
+
+/**
+ * @see https://w3c.github.io/pointerlock/#widl-MouseEvent-movementY
+ * @type {number}
+ */
+MouseEvent.prototype.movementY;
--- a/javascript/externs/web/w3c_range.js
+++ b/javascript/externs/web/w3c_range.js
@@ -32,6 +32,58 @@
 */
 function Range() {}

+// constants on the constructor
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.START_TO_START;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.START_TO_END;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.END_TO_END;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.END_TO_START;
+
+// constants repeated on the prototype
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.prototype.START_TO_START;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.prototype.START_TO_END;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.prototype.END_TO_END;
+
+/**
+ * @const {number}
+ * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
+ */
+Range.prototype.END_TO_START;
+
 /**
 * @type {Node}
 * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level-2-Range-attr-startParent
@@ -133,30 +185,6 @@ Range.prototype.selectNode = function(refNode) {};
 */
 Range.prototype.selectNodeContents = function(refNode) {};

-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
- */
-Range.prototype.START_TO_START = 0;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
- */
-Range.prototype.START_TO_END = 1;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
- */
-Range.prototype.END_TO_END = 2;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-Range-compareHow
- */
-Range.prototype.END_TO_START = 3;
-
 /**
 * @param {number} how
 * @param {Range} sourceRange
@@ -211,7 +239,7 @@ Range.prototype.detach = function() {};

 // Introduced in DOM Level 2:
 /**
- * @constructor
+ * @interface
 * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level-2-DocumentRange-idl
 */
 function DocumentRange() {}
@@ -221,28 +249,3 @@ function DocumentRange() {}
 * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#Level2-DocumentRange-method-createRange
 */
 DocumentRange.prototype.createRange = function() {};
-
-// Introduced in DOM Level 2:
-/**
- * @constructor
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#RangeException
- */
-function RangeException() {}
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#RangeExceptionCode
- */
-RangeException.prototype.code;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#RangeExceptionCode
- */
-RangeException.prototype.BAD_BOUNDARYPOINTS_ERR = 1;
-
-/**
- * @type {number}
- * @see http://www.w3.org/TR/DOM-Level-2-Traversal-Range/ranges.html#RangeExceptionCode
- */
-RangeException.prototype.INVALID_NODE_TYPE_ERR = 2;
--- a/javascript/externs/web/w3c_referrer_policy.js
+++ b/javascript/externs/web/w3c_referrer_policy.js
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's referrer policy specification.
+ * @see https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-delivery
+ * @externs
+ */
+
+/** @type {string} */
+HTMLAnchorElement.prototype.referrerPolicy;
+
+/** @type {string} */
+HTMLAreaElement.prototype.referrerPolicy;
+
+/** @type {string} */
+HTMLImageElement.prototype.referrerPolicy;
+
+/** @type {string} */
+HTMLIFrameElement.prototype.referrerPolicy;
+
+/** @type {string} */
+HTMLLinkElement.prototype.referrerPolicy;
--- a/javascript/externs/web/w3c_requestidlecallback.js
+++ b/javascript/externs/web/w3c_requestidlecallback.js
@@ -33,7 +33,7 @@ var IdleCallbackOptions;

 /**
 * Schedules a callback to run when the browser is idle.
- * @param {function(!IdleDeadline)} callback Called when the browser is idle.
+ * @param {function(!IdleDeadline): void} callback Called when the browser is idle.
 * @param {number|IdleCallbackOptions=} opt_options If set, gives the browser a time in ms by which
 *     it must execute the callback. No timeout enforced otherwise.
 * @return {number} A handle that can be used to cancel the scheduled callback.
@@ -43,7 +43,7 @@ function requestIdleCallback(callback, opt_options) {}

 /**
 * Cancels a callback scheduled to run when the browser is idle.
- * @param {number} handle The handle returned by {@code requestIdleCallback} for
+ * @param {number} handle The handle returned by `requestIdleCallback` for
 *     the scheduled callback to cancel.
 * @return {undefined}
 */
@@ -53,7 +53,7 @@ function cancelIdleCallback(handle) {}

 /**
 * An interface for an object passed into the callback for
- * {@code requestIdleCallback} that remains up-to-date on the amount of idle
+ * `requestIdleCallback` that remains up-to-date on the amount of idle
 * time left in the current time slice.
 * @interface
 */
--- a/javascript/externs/web/w3c_rtc.js
+++ b/javascript/externs/web/w3c_rtc.js
--- a/javascript/externs/web/w3c_screen_wake_lock.js
+++ b/javascript/externs/web/w3c_screen_wake_lock.js
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2020 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * Screen Wake Lock API
+ * W3C Editor's Draft 01 September 2020
+ * @externs
+ * @see https://w3c.github.io/screen-wake-lock/
+ */
+
+
+/** @type {!WakeLock} */
+Navigator.prototype.wakeLock;
+
+
+/**
+ * @interface
+ * @see https://w3c.github.io/screen-wake-lock/#the-wakelock-interface
+ */
+function WakeLock() {};
+
+/**
+ * @param {string} type
+ * @return {!Promise<!WakeLockSentinel>}
+ */
+WakeLock.prototype.request = function(type) {};
+
+
+/**
+ * @interface
+ * @extends {EventTarget}
+ * @see https://w3c.github.io/screen-wake-lock/#the-wakelocksentinel-interface
+ */
+function WakeLockSentinel() {};
+
+/** @type {?function(!Event)} */
+WakeLockSentinel.prototype.onrelease;
+
+/** @return {!Promise<void>} */
+WakeLockSentinel.prototype.release = function() {};
+
+/** @type {boolean} @const */
+WakeLockSentinel.prototype.released;
+
+/** @type {string} @const */
+WakeLockSentinel.prototype.type;
--- a/javascript/externs/web/w3c_selection.js
+++ b/javascript/externs/web/w3c_selection.js
@@ -0,0 +1,209 @@
+/*
+ * Copyright 2008 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Selection API.
+ *
+ * @see https://w3c.github.io/selection-api/
+ *
+ * @externs
+ */
+
+/**
+ * @constructor
+ * @see http://w3c.github.io/selection-api/#selection-interface
+ */
+function Selection() {}
+
+/**
+ * @type {?Node}
+ * @see https://w3c.github.io/selection-api/#dom-selection-anchornode
+ */
+Selection.prototype.anchorNode;
+
+/**
+ * @type {number}
+ * @see https://w3c.github.io/selection-api/#dom-selection-anchoroffset
+ */
+Selection.prototype.anchorOffset;
+
+/**
+ * @type {?Node}
+ * @see https://w3c.github.io/selection-api/#dom-selection-focusnode
+ */
+Selection.prototype.focusNode;
+
+/**
+ * @type {number}
+ * @see https://w3c.github.io/selection-api/#dom-selection-focusoffset
+ */
+Selection.prototype.focusOffset;
+
+/**
+ * @type {boolean}
+ * @see https://w3c.github.io/selection-api/#dom-selection-iscollapsed
+ */
+Selection.prototype.isCollapsed;
+
+/**
+ * @type {number}
+ * @see https://w3c.github.io/selection-api/#dom-selection-rangecount
+ */
+Selection.prototype.rangeCount;
+
+/**
+ * @type {string}
+ * @see https://w3c.github.io/selection-api/#dom-selection-type
+ */
+Selection.prototype.type;
+
+/**
+ * @param {number} index
+ * @return {!Range}
+ * @nosideeffects
+ * @see https://w3c.github.io/selection-api/#dom-selection-getrangeat
+ */
+Selection.prototype.getRangeAt = function(index) {};
+
+/**
+ * TODO(tjgq): Clean up internal usages and make the `range` parameter a
+ * `!Range` per the spec.
+ * @param {?Range} range
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-addrange
+ */
+Selection.prototype.addRange = function(range) {};
+
+/**
+ * @param {!Range} range
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-removerange
+ */
+Selection.prototype.removeRange = function(range) {};
+
+/**
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-removeallranges
+ */
+Selection.prototype.removeAllRanges = function() {};
+
+/**
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-empty
+ */
+Selection.prototype.empty = function() {};
+
+/**
+ * @param {?Node} node
+ * @param {number=} offset
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-collapse
+ */
+Selection.prototype.collapse = function(node, offset) {};
+
+/**
+ * @param {?Node} node
+ * @param {number=} offset
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-setposition
+ */
+Selection.prototype.setPosition = function(node, offset) {};
+
+/**
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-collapsetostart
+ */
+Selection.prototype.collapseToStart = function() {};
+
+/**
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-collapsetoend
+ */
+Selection.prototype.collapseToEnd = function() {};
+
+/**
+ * TODO(tjgq): Clean up internal usages and make the `node` parameter a `!Node`
+ * per the spec.
+ * @param {?Node} node
+ * @param {number=} offset
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-extend
+ */
+Selection.prototype.extend = function(node, offset) {};
+
+/**
+ * TODO(tjgq): Clean up internal usages and make the `anchorNode` and
+ * `focusNode` parameters `!Node` per the spec.
+ * @param {?Node} anchorNode
+ * @param {number} anchorOffset
+ * @param {?Node} focusNode
+ * @param {number} focusOffset
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-setbaseandextent
+ */
+Selection.prototype.setBaseAndExtent = function(anchorNode, anchorOffset, focusNode, focusOffset) {};
+
+/**
+ * TODO(tjgq): Clean up internal usages and make the `node` parameter a `!Node`
+ * per the spec.
+ * @param {?Node} node
+ * @return {undefined}
+ * @see http://w3c.github.io/selection-api/#dom-selection-selectallchildren
+ */
+Selection.prototype.selectAllChildren = function(node) {};
+
+/**
+ * @return {undefined}
+ * @see https://w3c.github.io/selection-api/#dom-selection-deletefromdocument
+ */
+Selection.prototype.deleteFromDocument = function() {};
+
+/**
+ * @param {!Node} node
+ * @param {boolean=} allowPartialContainment
+ * @return {boolean}
+ * @nosideeffects
+ * @see https://w3c.github.io/selection-api/#dom-selection-containsnode
+ */
+Selection.prototype.containsNode = function(node, allowPartialContainment) {};
+
+/**
+ * @return {?Selection}
+ * @nosideeffects
+ * @see https://w3c.github.io/selection-api/#dom-window-getselection
+ */
+Window.prototype.getSelection = function() {};
+
+/**
+ * @return {?Selection}
+ * @nosideeffects
+ * @see https://w3c.github.io/selection-api/#dom-document-getselection
+ */
+Document.prototype.getSelection = function() {};
+
+/**
+ * TODO(tjgq): Clean up internal usages and make this `?function(!Event): void`
+ * per the spec.
+ * @type {?function(?Event)}
+ * @see https://w3c.github.io/selection-api/#dom-globaleventhandlers-onselectstart
+ */
+Element.prototype.onselectstart;
+
+/**
+ * @type {?function(!Event): void}
+ * @see https://w3c.github.io/selection-api/#dom-globaleventhandlers-onselectionchange
+ */
+Element.prototype.onselectionchange;
--- a/javascript/externs/web/w3c_serviceworker.js
+++ b/javascript/externs/web/w3c_serviceworker.js
@@ -41,7 +41,55 @@ ServiceWorker.prototype.onstatechange;
 * 'activated', 'redundant'.
 *  @typedef {string}
 */
-var ServiceWorkerState ;
+var ServiceWorkerState;
+
+/**
+ * @see https://w3c.github.io/ServiceWorker/#navigationpreloadmanager
+ * @constructor
+ */
+function NavigationPreloadManager() {}
+
+/** @return {!Promise<void>} */
+NavigationPreloadManager.prototype.enable = function() {};
+
+/** @return {!Promise<void>} */
+NavigationPreloadManager.prototype.disable = function() {};
+
+/**
+ * @param {string=} value
+ * @return {!Promise<void>}
+ */
+NavigationPreloadManager.prototype.setHeaderValue = function(value) {};
+
+/** @return {!Promise<NavigationPreloadState>} */
+NavigationPreloadManager.prototype.getState = function() {};
+
+/**
+ *  @typedef {{
+ *   enabled: (boolean|undefined),
+ *   headerValue: (string|undefined)
+ * }}
+ */
+var NavigationPreloadState;
+
+/** @record */
+function PushSubscriptionOptions() {}
+
+/** @type {ArrayBuffer|undefined} */
+PushSubscriptionOptions.prototype.applicationServerKey;
+
+/** @type {boolean|undefined} */
+PushSubscriptionOptions.prototype.userVisibleOnly;
+
+/** @record */
+function PushSubscriptionOptionsInit() {}
+
+/** @type {BufferSource|string|undefined} */
+PushSubscriptionOptionsInit.prototype.applicationServerKey;
+
+/** @type {boolean|undefined} */
+PushSubscriptionOptionsInit.prototype.userVisibleOnly;
+

 /**
 * @see https://w3c.github.io/push-api/
@@ -59,6 +107,9 @@ PushSubscription.prototype.endpoint;
 */
 PushSubscription.prototype.subscriptionId;

+/** @type {!PushSubscriptionOptions} */
+PushSubscription.prototype.options;
+
 /** @return {!Promise<boolean>} */
 PushSubscription.prototype.unsubscribe = function() {};

@@ -78,8 +129,8 @@ PushSubscription.prototype.unsubscribe = function() {};
 function PushManager() {}

 /**
- * @param {PushSubscriptionOptions=} opt_options
- * @return {!Promise<PushSubscription>}
+ * @param {PushSubscriptionOptionsInit=} opt_options
+ * @return {!Promise<!PushSubscription>}
 */
 PushManager.prototype.subscribe = function(opt_options) {};

@@ -92,10 +143,34 @@ PushManager.prototype.getSubscription = function() {};
 // PushManager.prototype.hasPermission = function() {};

 /**
- * @typedef {{userVisibleOnly: (boolean|undefined)}}
- * @see https://w3c.github.io/push-api/#idl-def-PushSubscriptionOptions
+ * @see https://wicg.github.io/BackgroundSync/spec/#sync-manager-interface
+ * @constructor
 */
-var PushSubscriptionOptions;
+function SyncManager() {}
+
+/**
+ * @param {string} tag
+ * @return {!Promise<void>}
+ */
+SyncManager.prototype.register = function(tag) {}
+
+/**
+ * @return {!Promise<Array<string>>}
+ */
+SyncManager.prototype.getTags = function() {}
+
+/**
+ * @see https://wicg.github.io/BackgroundSync/spec/#sync-event
+ * @constructor
+ * @extends{ExtendableEvent}
+ */
+function SyncEvent() {}
+
+/** @type {string} */
+SyncEvent.prototype.tag;
+
+/** @type {boolean} */
+SyncEvent.prototype.lastChance;

 /**
 * @see http://www.w3.org/TR/push-api/#idl-def-PushMessageData
@@ -145,6 +220,9 @@ ServiceWorkerRegistration.prototype.waiting;
 /** @type {ServiceWorker} */
 ServiceWorkerRegistration.prototype.active;

+/** @type {NavigationPreloadManager} */
+ServiceWorkerRegistration.prototype.navigationPreload;
+
 /** @type {string} */
 ServiceWorkerRegistration.prototype.scope;

@@ -179,6 +257,12 @@ ServiceWorkerRegistration.prototype.showNotification =
 */
 ServiceWorkerRegistration.prototype.getNotifications = function(opt_filter) {};

+/**
+ * @see https://wicg.github.io/BackgroundSync/spec/#service-worker-registration-extensions
+ * @type {!SyncManager}
+ */
+ServiceWorkerRegistration.prototype.sync;
+
 /**
 * @see http://www.w3.org/TR/service-workers/#service-worker-container-interface
 * @interface
@@ -193,7 +277,7 @@ ServiceWorkerContainer.prototype.controller;
 ServiceWorkerContainer.prototype.ready;

 /**
- * @param {string} scriptURL
+ * @param {!TrustedScriptURL|string} scriptURL
 * @param {RegistrationOptions=} opt_options
 * @return {!Promise<!ServiceWorkerRegistration>}
 */
@@ -210,14 +294,17 @@ ServiceWorkerContainer.prototype.getRegistration = function(opt_documentURL) {};
 */
 ServiceWorkerContainer.prototype.getRegistrations = function() {};

-/** @type {?function(!Event)} */
+/** @type {?function(!Event): void} */
 ServiceWorkerContainer.prototype.oncontrollerchange;

-/** @type {?function(!ErrorEvent)} */
+/** @type {?function(!ExtendableMessageEvent): void} */
+ServiceWorkerContainer.prototype.onmessage;
+
+/** @type {?function(!ErrorEvent): void} */
 ServiceWorkerContainer.prototype.onerror;

 /**
- * @typedef {{scope: (string|undefined), useCache: (boolean|undefined)}}
+ * @typedef {{scope: (string|undefined), useCache: (boolean|undefined), updateViaCache: (string|undefined)}}
 */
 var RegistrationOptions;

@@ -276,8 +363,19 @@ ServiceWorkerGlobalScope.prototype.onevicted;
 /** @type {?function(!MessageEvent)} */
 ServiceWorkerGlobalScope.prototype.onmessage;

-/** @type {!IDBFactory|undefined} */
-ServiceWorkerGlobalScope.prototype.indexedDB;
+/**
+ * While not strictly correct, this should be effectively correct. Notification
+ * is the Notification constructor but calling it from the Service Worker throws
+ * (https://notifications.spec.whatwg.org/#constructors) so its only use is as
+ * an object holding some static properties (note that requestPermission is only
+ * exposed to window context - https://notifications.spec.whatwg.org/#api).
+ *
+ * @type {{
+ *   permission: string,
+ *   maxActions: number,
+ * }}
+ */
+ServiceWorkerGlobalScope.prototype.Notification;

 /**
 * @see http://www.w3.org/TR/service-workers/#service-worker-client-interface
@@ -300,6 +398,9 @@ ServiceWorkerClient.prototype.visibilityState;
 /** @type {string} */
 ServiceWorkerClient.prototype.url;

+/** @type {string} */
+ServiceWorkerClient.prototype.id;
+
 /**
 * // TODO(mtragut): Possibly replace the type with enum ContextFrameType once
 * the enum is defined.
@@ -317,6 +418,12 @@ ServiceWorkerClient.prototype.postMessage = function(message, opt_transfer) {};
 /** @return {!Promise} */
 ServiceWorkerClient.prototype.focus = function() {};

+/**
+ * @param {string} url
+ * @return {!Promise<!ServiceWorkerClient>}
+ */
+ServiceWorkerClient.prototype.navigate = function(url) {};
+
 /**
 * @see http://www.w3.org/TR/service-workers/#service-worker-clients-interface
 * @interface
@@ -349,6 +456,12 @@ ServiceWorkerClients.prototype.claim = function() {};
 */
 ServiceWorkerClients.prototype.openWindow = function(url) {};

+/**
+ * @param {string} id
+ * @return {!Promise<!ServiceWorkerClient|undefined>}
+ */
+ServiceWorkerClients.prototype.get = function(id) {};
+
 /** @typedef {{includeUncontrolled: (boolean|undefined)}} */
 var ServiceWorkerClientQueryOptions;

@@ -506,21 +619,35 @@ var InstallEventInit;
 * @constructor
 * @param {string} type
 * @param {FetchEventInit=} opt_eventInitDict
- * @extends {Event}
+ * @extends {ExtendableEvent}
 */
 function FetchEvent(type, opt_eventInitDict) {}

 /** @type {!Request} */
 FetchEvent.prototype.request;

-/** @type {!ServiceWorkerClient} */
-FetchEvent.prototype.client;
-
-/** @type {!boolean} */
-FetchEvent.prototype.isReload;
+/**
+ * @type {!Promise<Response>}
+ */
+FetchEvent.prototype.preloadResponse;

 /**
- * @param {(Response|Promise<Response>)} r
+ * @type {!ServiceWorkerClient}
+ * @deprecated
+ */
+FetchEvent.prototype.client;
+
+/** @type {?string} */
+FetchEvent.prototype.clientId;
+
+/** @type {boolean} */
+FetchEvent.prototype.isReload;
+
+/** @type {?string} */
+FetchEvent.prototype.resultingClientId;
+
+/**
+ * @param {(Response|IThenable<Response>)} r
 * @return {undefined}
 */
 FetchEvent.prototype.respondWith = function(r) {};
@@ -541,8 +668,59 @@ FetchEvent.prototype.default = function() {};
 *   bubbles: (boolean|undefined),
 *   cancelable: (boolean|undefined),
 *   request: (!Request|undefined),
+ *   preloadResponse: (!Promise<Response>),
 *   client: (!ServiceWorkerClient|undefined),
- *   isReload: (!boolean|undefined)
+ *   isReload: (boolean|undefined)
 * }}
 */
 var FetchEventInit;
+
+
+/**
+ * @see https://www.w3.org/TR/service-workers/#extendablemessage-event-interface
+ * @param {string} type
+ * @param {!ExtendableMessageEventInit<T>=} opt_eventInitDict
+ * @constructor
+ * @extends {ExtendableEvent}
+ * @template T
+ */
+function ExtendableMessageEvent(type, opt_eventInitDict) {};
+
+/** @type {T} */
+ExtendableMessageEvent.prototype.data;
+
+/** @type {string} */
+ExtendableMessageEvent.prototype.origin;
+
+/** @type {string} */
+ExtendableMessageEvent.prototype.lastEventId;
+
+/** @type {?ServiceWorkerClient|?ServiceWorker|?MessagePort} */
+ExtendableMessageEvent.prototype.source;
+
+/** @type {?Array<!MessagePort>} */
+ExtendableMessageEvent.prototype.ports;
+
+
+/**
+ * @see https://www.w3.org/TR/service-workers/#extendablemessage-event-init-dictionary
+ * @record
+ * @extends {ExtendableEventInit}
+ * @template T
+ */
+function ExtendableMessageEventInit() {};
+
+/** @type {T} */
+ExtendableMessageEventInit.prototype.data;
+
+/** @type {string|undefined} */
+ExtendableMessageEventInit.prototype.origin;
+
+/** @type {string|undefined} */
+ExtendableMessageEventInit.prototype.lastEventId;
+
+/** @type {!ServiceWorkerClient|!ServiceWorker|!MessagePort|undefined} */
+ExtendableMessageEventInit.prototype.source;
+
+/** @type {!Array<!MessagePort>|undefined} */
+ExtendableMessageEventInit.prototype.ports;
--- a/javascript/externs/web/w3c_speech.js
+++ b/javascript/externs/web/w3c_speech.js
@@ -0,0 +1,412 @@
+/*
+ * Copyright 2011 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Speech Input 2010 draft API and the
+ * 2012 Web Speech draft API (in progress).
+ * 2010 Speech Input API:
+ * http://www.w3.org/2005/Incubator/htmlspeech/2010/10/google-api-draft.html
+ * 2012 Web Speech API:
+ * http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
+ * This file contains only those functions/properties that are actively
+ * used in the Voice Search experiment. Because the draft is under discussion
+ * and constantly evolving, this file does not attempt to stay in sync with it.
+ *
+ * @externs
+ */
+
+// W3C Speech Input API implemented in Chrome M12
+/**
+ * @constructor
+ * @extends {UIEvent}
+ */
+function SpeechInputEvent() {}
+
+/** @type {SpeechInputResultList} */
+SpeechInputEvent.prototype.results;
+
+
+/**
+ * @constructor
+ */
+function SpeechInputResultList() {}
+
+/** @type {number} */
+SpeechInputResultList.prototype.length;
+
+
+/**
+ * @constructor
+ */
+function SpeechInputResult() {}
+
+/** @type {string} */
+SpeechInputResult.prototype.utterance;
+
+/** @type {number} */
+SpeechInputResult.prototype.confidence;
+
+
+// HTMLInputElement
+/** @type {boolean} */
+HTMLInputElement.prototype.webkitspeech;
+
+/** @type {?function (Event)} */
+HTMLInputElement.prototype.onwebkitspeechchange;
+
+
+
+// W3C Web Speech API implemented in Chrome M23
+/**
+ * @constructor
+ * @implements {EventTarget}
+ */
+function SpeechRecognition() {}
+
+/** @override */
+SpeechRecognition.prototype.addEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
+SpeechRecognition.prototype.removeEventListener = function(
+    type, listener, opt_options) {};
+
+/** @override */
+SpeechRecognition.prototype.dispatchEvent = function(evt) {};
+
+/** @type {SpeechGrammarList} */
+SpeechRecognition.prototype.grammars;
+
+/** @type {string} */
+SpeechRecognition.prototype.lang;
+
+/** @type {boolean} */
+SpeechRecognition.prototype.continuous;
+
+/** @type {boolean} */
+SpeechRecognition.prototype.interimResults;
+
+/** @type {number} */
+SpeechRecognition.prototype.maxAlternatives;
+
+/** @type {string} */
+SpeechRecognition.prototype.serviceURI;
+
+/** @type {function()} */
+SpeechRecognition.prototype.start;
+
+/** @type {function()} */
+SpeechRecognition.prototype.stop;
+
+/** @type {function()} */
+SpeechRecognition.prototype.abort;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onaudiostart;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onsoundstart;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onspeechstart;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onspeechend;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onsoundend;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onaudioend;
+
+/** @type {?function(!SpeechRecognitionEvent)} */
+SpeechRecognition.prototype.onresult;
+
+/** @type {?function(!SpeechRecognitionEvent)} */
+SpeechRecognition.prototype.onnomatch;
+
+/** @type {?function(!SpeechRecognitionError)} */
+SpeechRecognition.prototype.onerror;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onstart;
+
+/** @type {?function(!Event)} */
+SpeechRecognition.prototype.onend;
+
+
+/**
+ * @constructor
+ * @extends {Event}
+ */
+function SpeechRecognitionError() {}
+
+/** @type {string} */
+SpeechRecognitionError.prototype.error;
+
+/** @type {string} */
+SpeechRecognitionError.prototype.message;
+
+
+/**
+ * @constructor
+ */
+function SpeechRecognitionAlternative() {}
+
+/** @type {string} */
+SpeechRecognitionAlternative.prototype.transcript;
+
+/** @type {number} */
+SpeechRecognitionAlternative.prototype.confidence;
+
+
+/**
+ * @constructor
+ */
+function SpeechRecognitionResult() {}
+
+/**
+ * @type {number}
+ */
+SpeechRecognitionResult.prototype.length;
+
+/**
+ * @type {function(number): SpeechRecognitionAlternative}
+ */
+SpeechRecognitionResult.prototype.item = function(index) {};
+
+/**
+ * @type {boolean}
+ */
+SpeechRecognitionResult.prototype.isFinal;
+
+
+/**
+ * @constructor
+ */
+function SpeechRecognitionResultList() {}
+
+/**
+ * @type {number}
+ */
+SpeechRecognitionResultList.prototype.length;
+
+/**
+ * @type {function(number): SpeechRecognitionResult}
+ */
+SpeechRecognitionResultList.prototype.item = function(index) {};
+
+
+/**
+ * @constructor
+ * @extends {Event}
+ */
+function SpeechRecognitionEvent() {}
+
+/** @type {number} */
+SpeechRecognitionEvent.prototype.resultIndex;
+
+/** @type {SpeechRecognitionResultList} */
+SpeechRecognitionEvent.prototype.results;
+
+/** @type {*} */
+SpeechRecognitionEvent.prototype.interpretation;
+
+/** @type {Document} */
+SpeechRecognitionEvent.prototype.emma;
+
+
+/**
+ * @constructor
+ */
+function SpeechGrammar() {}
+
+/** @type {string} */
+SpeechGrammar.prototype.src;
+
+/** @type {number} */
+SpeechGrammar.prototype.weight;
+
+
+/**
+ * @constructor
+ */
+function SpeechGrammarList() {}
+
+/**
+ * @type {number}
+ */
+SpeechGrammarList.prototype.length;
+
+/**
+ * @type {function(number): SpeechGrammar}
+ */
+SpeechGrammarList.prototype.item = function(index) {};
+
+/**
+ * @type {function(string, number)}
+ */
+SpeechGrammarList.prototype.addFromUri = function(src, weight) {};
+
+/**
+ * @type {function(string, number)}
+ */
+SpeechGrammarList.prototype.addFromString = function(str, weight) {};
+
+
+// Webkit implementations of Web Speech API
+/**
+ * @constructor
+ * @extends {SpeechGrammarList}
+ */
+function webkitSpeechGrammarList() {}
+
+
+/**
+ * @constructor
+ * @extends {SpeechGrammar}
+ */
+function webkitSpeechGrammar() {}
+
+
+/**
+ * @constructor
+ * @extends {SpeechRecognitionEvent}
+ */
+function webkitSpeechRecognitionEvent() {}
+
+
+/**
+ * @constructor
+ * @extends {SpeechRecognitionError}
+ */
+function webkitSpeechRecognitionError() {}
+
+
+/**
+ * @constructor
+ * @extends {SpeechRecognition}
+ */
+function webkitSpeechRecognition() {}
+
+
+
+// W3C Web Speech Synthesis API is implemented in Chrome M33
+/**
+ * @type {SpeechSynthesis}
+ * @see https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html#tts-section
+ */
+var speechSynthesis;
+
+
+/**
+ * @constructor
+ * @param {string} text
+ */
+function SpeechSynthesisUtterance(text) {}
+
+/** @type {string} */
+SpeechSynthesisUtterance.prototype.text;
+
+/** @type {string} */
+SpeechSynthesisUtterance.prototype.lang;
+
+/** @type {number} */
+SpeechSynthesisUtterance.prototype.pitch;
+
+/** @type {number} */
+SpeechSynthesisUtterance.prototype.rate;
+
+/** @type {SpeechSynthesisVoice} */
+SpeechSynthesisUtterance.prototype.voice;
+
+/** @type {number} */
+SpeechSynthesisUtterance.prototype.volume;
+
+/**
+ * @param {Event} event
+ */
+SpeechSynthesisUtterance.prototype.onstart = function(event) {};
+
+/**
+ * @param {Event} event
+ */
+SpeechSynthesisUtterance.prototype.onend = function(event) {};
+
+/**
+ * @param {Event} event
+ */
+SpeechSynthesisUtterance.prototype.onerror = function(event) {};
+
+/**
+ * @constructor
+ */
+function SpeechSynthesisVoice() {}
+
+/** @type {string} */
+SpeechSynthesisVoice.prototype.voiceURI;
+
+/** @type {string} */
+SpeechSynthesisVoice.prototype.name;
+
+/** @type {string} */
+SpeechSynthesisVoice.prototype.lang;
+
+/** @type {boolean} */
+SpeechSynthesisVoice.prototype.localService;
+
+/** @type {boolean} */
+SpeechSynthesisVoice.prototype.default;
+
+
+/**
+ * @constructor
+ * @extends {Array<!SpeechSynthesisVoice>}
+ */
+function SpeechSynthesisVoiceList() {}
+
+
+/**
+ * @interface
+ * @extends {EventTarget}
+ */
+function SpeechSynthesis() {}
+
+/**
+ * @param {SpeechSynthesisUtterance} utterance
+ * @return {undefined}
+ */
+SpeechSynthesis.prototype.speak = function(utterance) {};
+
+/** @type {function()} */
+SpeechSynthesis.prototype.cancel;
+
+/** @type {function()} */
+SpeechSynthesis.prototype.pause;
+
+/** @type {function()} */
+SpeechSynthesis.prototype.resume;
+
+/**
+ * @return {SpeechSynthesisVoiceList}
+ */
+SpeechSynthesis.prototype.getVoices = function() {};
+
+/**
+ * @param {Event} event
+ * @see https://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi-errata.html
+ */
+SpeechSynthesis.prototype.onvoiceschanged = function(event) {};
--- a/javascript/externs/web/w3c_trusted_types.js
+++ b/javascript/externs/web/w3c_trusted_types.js
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2018 The Closure Compiler Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Definitions for W3C's Trusted Types specification.
+ * @see https://w3c.github.io/webappsec-trusted-types/dist/spec/
+ * @externs
+ */
+
+
+/** @constructor */
+function TrustedHTML() {}
+
+// function TrustedScript() was moved to `es3.js` so that is could be used by
+// `eval()`.
+
+/** @constructor */
+function TrustedScriptURL() {}
+
+
+/**
+ * @template Options
+ * @constructor
+ */
+function TrustedTypePolicy() {}
+
+/**
+ * @param {string} s
+ * @return {!TrustedHTML}
+ */
+TrustedTypePolicy.prototype.createHTML = function(s) {};
+
+/**
+ * @param {string} s
+ * @return {!TrustedScript}
+ */
+TrustedTypePolicy.prototype.createScript = function(s) {};
+
+/**
+ * @param {string} s
+ * @return {!TrustedScriptURL}
+ */
+TrustedTypePolicy.prototype.createScriptURL = function(s) {};
+
+
+/** @constructor */
+function TrustedTypePolicyFactory() {}
+
+/** @record @private */
+function TrustedTypePolicyOptions() {};
+
+/**
+ *  @type {(function(string, ...*): string)|undefined},
+ */
+TrustedTypePolicyOptions.prototype.createHTML;
+
+/**
+ *  @type {(function(string, ...*): string)|undefined},
+ */
+TrustedTypePolicyOptions.prototype.createScript;
+
+/**
+ *  @type {(function(string, ...*): string)|undefined},
+ */
+TrustedTypePolicyOptions.prototype.createScriptURL;
+
+
+/**
+ * @param {string} name
+ * @param {!TrustedTypePolicyOptions} policy
+ * @return {!TrustedTypePolicy}
+ */
+TrustedTypePolicyFactory.prototype.createPolicy = function(name, policy) {};
+
+
+/**
+ * @param {*} obj
+ * @return {boolean}
+ */
+TrustedTypePolicyFactory.prototype.isHTML = function(obj) {};
+
+/**
+ * @param {*} obj
+ * @return {boolean}
+ */
+TrustedTypePolicyFactory.prototype.isScript = function(obj) {};
+
+/**
+ * @param {*} obj
+ * @return {boolean}
+ */
+TrustedTypePolicyFactory.prototype.isScriptURL = function(obj) {};
+
+
+/** @type {!TrustedHTML} */
+TrustedTypePolicyFactory.prototype.emptyHTML;
+
+
+/** @type {!TrustedScript} */
+TrustedTypePolicyFactory.prototype.emptyScript;
+
+/**
+ * @param {string} tagName
+ * @param {string} attribute
+ * @param {string=} elementNs
+ * @param {string=} attrNs
+ * @return {?string}
+ */
+TrustedTypePolicyFactory.prototype.getAttributeType = function(
+    tagName, attribute, elementNs, attrNs) {};
+
+/**
+ * @param {string} tagName
+ * @param {string} property
+ * @param {string=} elementNs
+ * @return {?string}
+ */
+TrustedTypePolicyFactory.prototype.getPropertyType = function(
+    tagName, property, elementNs) {};
+
+/** @type {?TrustedTypePolicy} */
+TrustedTypePolicyFactory.prototype.defaultPolicy;
+
+
+/** @type {!TrustedTypePolicyFactory} */
+var trustedTypes;
--- a/Show More
+++ b/Show More