First cut of mini dart:html.

lib/runtime/dart/html_common.js

+dart_library.library('dart/html_common', null, /* Imports */[
+  "dart/_runtime",
+  'dart/_metadata',
+  'dart/core',
+  'dart/html',
+  'dart/typed_data',
+  'dart/_js_helper',
+  'dart/_native_typed_data',
+  'dart/async',
+  'dart/collection',
+  'dart/_internal'
+], /* Lazy imports */[
+], function(exports, dart, _metadata, core, html, typed_data, _js_helper, _native_typed_data, async, collection, _internal) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.export_(exports, _metadata);
+  const _validateToken = Symbol('_validateToken');
+  class CssClassSetImpl extends core.Object {
+    [_validateToken](value) {
+      if (dart.notNull(CssClassSetImpl._validTokenRE.hasMatch(value)))
+        return value;
+      dart.throw(new core.ArgumentError.value(value, 'value', 'Not a valid class token'));
+    }
+    toString() {
+      return this.readClasses().join(' ');
+    }
+    toggle(value, shouldAdd) {
+      if (shouldAdd === void 0)
+        shouldAdd = null;
+      this[_validateToken](value);
+      let s = this.readClasses();
+      let result = false;
+      if (shouldAdd == null)
+        shouldAdd = !dart.notNull(s.contains(value));
+      if (dart.notNull(shouldAdd)) {
+        s.add(value);
+        result = true;
+      } else {
+        s.remove(value);
+      }
+      this.writeClasses(s);
+      return result;
+    }
+    get frozen() {
+      return false;
+    }
+    get iterator() {
+      return this.readClasses().iterator;
+    }
+    [Symbol.iterator]() {
+      return new dart.JsIterator(this.iterator);
+    }
+    forEach(f) {
+      this.readClasses().forEach(f);
+    }
+    join(separator) {
+      if (separator === void 0)
+        separator = "";
+      return this.readClasses().join(separator);
+    }
+    map(f) {
+      return this.readClasses().map(f);
+    }
+    where(f) {
+      return this.readClasses().where(f);
+    }
+    expand(f) {
+      return this.readClasses().expand(f);
+    }
+    every(f) {
+      return this.readClasses().every(f);
+    }
+    any(f) {
+      return this.readClasses().any(f);
+    }
+    get isEmpty() {
+      return this.readClasses().isEmpty;
+    }
+    get isNotEmpty() {
+      return this.readClasses().isNotEmpty;
+    }
+    get length() {
+      return this.readClasses().length;
+    }
+    reduce(combine) {
+      return this.readClasses().reduce(combine);
+    }
+    fold(initialValue, combine) {
+      return this.readClasses().fold(initialValue, combine);
+    }
+    contains(value) {
+      if (!(typeof value == 'string'))
+        return false;
+      this[_validateToken](dart.as(value, core.String));
+      return this.readClasses().contains(value);
+    }
+    lookup(value) {
+      return dart.as(dart.notNull(this.contains(value)) ? value : null, core.String);
+    }
+    add(value) {
+      this[_validateToken](value);
+      return dart.as(this.modify(dart.fn(s => dart.dsend(s, 'add', value))), core.bool);
+    }
+    remove(value) {
+      this[_validateToken](dart.as(value, core.String));
+      if (!(typeof value == 'string'))
+        return false;
+      let s = this.readClasses();
+      let result = s.remove(value);
+      this.writeClasses(s);
+      return result;
+    }
+    addAll(iterable) {
+      this.modify(dart.fn((s => dart.dsend(s, 'addAll', iterable[dartx.map](dart.bind(this, _validateToken)))).bind(this)));
+    }
+    removeAll(iterable) {
+      this.modify(dart.fn((s => dart.dsend(s, 'removeAll', iterable[dartx.map](dart.as(dart.bind(this, _validateToken), __CastType0)))).bind(this)));
+    }
+    toggleAll(iterable, shouldAdd) {
+      if (shouldAdd === void 0)
+        shouldAdd = null;
+      iterable[dartx.forEach](dart.fn((e => this.toggle(dart.as(e, core.String), shouldAdd)).bind(this), core.bool, [dart.dynamic]));
+    }
+    retainAll(iterable) {
+      this.modify(dart.fn(s => dart.dsend(s, 'retainAll', iterable)));
+    }
+    removeWhere(test) {
+      this.modify(dart.fn(s => dart.dsend(s, 'removeWhere', test)));
+    }
+    retainWhere(test) {
+      this.modify(dart.fn(s => dart.dsend(s, 'retainWhere', test)));
+    }
+    containsAll(collection) {
+      return this.readClasses().containsAll(collection);
+    }
+    intersection(other) {
+      return this.readClasses().intersection(other);
+    }
+    union(other) {
+      return this.readClasses().union(other);
+    }
+    difference(other) {
+      return this.readClasses().difference(other);
+    }
+    get first() {
+      return this.readClasses().first;
+    }
+    get last() {
+      return this.readClasses().last;
+    }
+    get single() {
+      return this.readClasses().single;
+    }
+    toList(opts) {
+      let growable = opts && 'growable' in opts ? opts.growable : true;
+      return this.readClasses().toList({growable: growable});
+    }
+    toSet() {
+      return this.readClasses().toSet();
+    }
+    take(n) {
+      return this.readClasses().take(n);
+    }
+    takeWhile(test) {
+      return this.readClasses().takeWhile(test);
+    }
+    skip(n) {
+      return this.readClasses().skip(n);
+    }
+    skipWhile(test) {
+      return this.readClasses().skipWhile(test);
+    }
+    firstWhere(test, opts) {
+      let orElse = opts && 'orElse' in opts ? opts.orElse : null;
+      return this.readClasses().firstWhere(test, {orElse: orElse});
+    }
+    lastWhere(test, opts) {
+      let orElse = opts && 'orElse' in opts ? opts.orElse : null;
+      return this.readClasses().lastWhere(test, {orElse: orElse});
+    }
+    singleWhere(test) {
+      return this.readClasses().singleWhere(test);
+    }
+    elementAt(index) {
+      return this.readClasses().elementAt(index);
+    }
+    clear() {
+      this.modify(dart.fn(s => dart.dsend(s, 'clear')));
+    }
+    modify(f) {
+      let s = this.readClasses();
+      let ret = f(s);
+      this.writeClasses(s);
+      return ret;
+    }
+  }
+  CssClassSetImpl[dart.implements] = () => [html.CssClassSet];
+  dart.setSignature(CssClassSetImpl, {
+    methods: () => ({
+      [_validateToken]: [core.String, [core.String]],
+      toggle: [core.bool, [core.String], [core.bool]],
+      forEach: [dart.void, [dart.functionType(dart.void, [core.String])]],
+      join: [core.String, [], [core.String]],
+      map: [core.Iterable, [dart.functionType(dart.dynamic, [core.String])]],
+      where: [core.Iterable$(core.String), [dart.functionType(core.bool, [core.String])]],
+      expand: [core.Iterable, [dart.functionType(core.Iterable, [core.String])]],
+      every: [core.bool, [dart.functionType(core.bool, [core.String])]],
+      any: [core.bool, [dart.functionType(core.bool, [core.String])]],
+      reduce: [core.String, [dart.functionType(core.String, [core.String, core.String])]],
+      fold: [dart.dynamic, [dart.dynamic, dart.functionType(dart.dynamic, [dart.dynamic, core.String])]],
+      contains: [core.bool, [core.Object]],
+      lookup: [core.String, [core.Object]],
+      add: [core.bool, [core.String]],
+      remove: [core.bool, [core.Object]],
+      addAll: [dart.void, [core.Iterable$(core.String)]],
+      removeAll: [dart.void, [core.Iterable$(core.Object)]],
+      toggleAll: [dart.void, [core.Iterable$(core.String)], [core.bool]],
+      retainAll: [dart.void, [core.Iterable$(core.Object)]],
+      removeWhere: [dart.void, [dart.functionType(core.bool, [core.String])]],
+      retainWhere: [dart.void, [dart.functionType(core.bool, [core.String])]],
+      containsAll: [core.bool, [core.Iterable$(core.Object)]],
+      intersection: [core.Set$(core.String), [core.Set$(core.Object)]],
+      union: [core.Set$(core.String), [core.Set$(core.String)]],
+      difference: [core.Set$(core.String), [core.Set$(core.String)]],
+      toList: [core.List$(core.String), [], {growable: core.bool}],
+      toSet: [core.Set$(core.String), []],
+      take: [core.Iterable$(core.String), [core.int]],
+      takeWhile: [core.Iterable$(core.String), [dart.functionType(core.bool, [core.String])]],
+      skip: [core.Iterable$(core.String), [core.int]],
+      skipWhile: [core.Iterable$(core.String), [dart.functionType(core.bool, [core.String])]],
+      firstWhere: [core.String, [dart.functionType(core.bool, [core.String])], {orElse: dart.functionType(core.String, [])}],
+      lastWhere: [core.String, [dart.functionType(core.bool, [core.String])], {orElse: dart.functionType(core.String, [])}],
+      singleWhere: [core.String, [dart.functionType(core.bool, [core.String])]],
+      elementAt: [core.String, [core.int]],
+      clear: [dart.void, []],
+      modify: [dart.dynamic, [dart.functionType(dart.dynamic, [core.Set$(core.String)])]]
+    })
+  });
+  dart.defineExtensionMembers(CssClassSetImpl, [
+    'forEach',
+    'join',
+    'map',
+    'where',
+    'expand',
+    'every',
+    'any',
+    'reduce',
+    'fold',
+    'contains',
+    'toList',
+    'toSet',
+    'take',
+    'takeWhile',
+    'skip',
+    'skipWhile',
+    'firstWhere',
+    'lastWhere',
+    'singleWhere',
+    'elementAt',
+    'iterator',
+    'isEmpty',
+    'isNotEmpty',
+    'length',
+    'first',
+    'last',
+    'single'
+  ]);
+  dart.defineLazyProperties(CssClassSetImpl, {
+    get _validTokenRE() {
+      return core.RegExp.new('^\\S+$');
+    }
+  });
+  const __CastType0 = dart.typedef('__CastType0', () => dart.functionType(dart.dynamic, [core.Object]));
+  function convertDartToNative_SerializedScriptValue(value) {
+    return convertDartToNative_PrepareForStructuredClone(value);
+  }
+  dart.fn(convertDartToNative_SerializedScriptValue);
+  function convertNativeToDart_SerializedScriptValue(object) {
+    return convertNativeToDart_AcceptStructuredClone(object, {mustCopy: true});
+  }
+  dart.fn(convertNativeToDart_SerializedScriptValue);
+  class _StructuredClone extends core.Object {
+    _StructuredClone() {
+      this.values = [];
+      this.copies = [];
+    }
+    findSlot(value) {
+      let length = this.values[dartx.length];
+      for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
+        if (dart.notNull(core.identical(this.values[dartx.get](i), value)))
+          return i;
+      }
+      this.values[dartx.add](value);
+      this.copies[dartx.add](null);
+      return length;
+    }
+    readSlot(i) {
+      return this.copies[dartx.get](i);
+    }
+    writeSlot(i, x) {
+      this.copies[dartx.set](i, x);
+    }
+    cleanupSlots() {}
+    walk(e) {
+      if (e == null)
+        return e;
+      if (typeof e == 'boolean')
+        return e;
+      if (typeof e == 'number')
+        return e;
+      if (typeof e == 'string')
+        return e;
+      if (dart.is(e, core.DateTime)) {
+        return convertDartToNative_DateTime(dart.as(e, core.DateTime));
+      }
+      if (dart.is(e, core.RegExp)) {
+        dart.throw(new core.UnimplementedError('structured clone of RegExp'));
+      }
+      if (dart.is(e, dart.dynamic))
+        return e;
+      if (dart.is(e, dart.dynamic))
+        return e;
+      if (dart.is(e, dart.dynamic))
+        return e;
+      if (dart.is(e, dart.dynamic))
+        return e;
+      if (dart.notNull(this.cloneNotRequired(e)))
+        return e;
+      if (dart.is(e, core.Map)) {
+        let slot = this.findSlot(e);
+        let copy = this.readSlot(slot);
+        if (copy != null)
+          return copy;
+        copy = this.newJsMap();
+        this.writeSlot(slot, copy);
+        dart.dsend(e, 'forEach', dart.fn(((key, value) => {
+          this.putIntoMap(copy, key, this.walk(value));
+        }).bind(this)));
+        return copy;
+      }
+      if (dart.is(e, core.List)) {
+        let slot = this.findSlot(e);
+        let copy = this.readSlot(slot);
+        if (copy != null)
+          return copy;
+        copy = this.copyList(dart.as(e, core.List), slot);
+        return copy;
+      }
+      dart.throw(new core.UnimplementedError('structured clone of other type'));
+    }
+    copyList(e, slot) {
+      let i = 0;
+      let length = e[dartx.length];
+      let copy = this.newJsList(length);
+      this.writeSlot(slot, copy);
+      for (; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
+        dart.dsetindex(copy, i, this.walk(e[dartx.get](i)));
+      }
+      return copy;
+    }
+    convertDartToNative_PrepareForStructuredClone(value) {
+      let copy = this.walk(value);
+      this.cleanupSlots();
+      return copy;
+    }
+  }
+  dart.setSignature(_StructuredClone, {
+    methods: () => ({
+      findSlot: [core.int, [dart.dynamic]],
+      readSlot: [dart.dynamic, [core.int]],
+      writeSlot: [dart.dynamic, [core.int, dart.dynamic]],
+      cleanupSlots: [dart.dynamic, []],
+      walk: [dart.dynamic, [dart.dynamic]],
+      copyList: [dart.dynamic, [core.List, core.int]],
+      convertDartToNative_PrepareForStructuredClone: [dart.dynamic, [dart.dynamic]]
+    })
+  });
+  class _AcceptStructuredClone extends core.Object {
+    _AcceptStructuredClone() {
+      this.values = [];
+      this.copies = [];
+      this.mustCopy = false;
+    }
+    findSlot(value) {
+      let length = this.values[dartx.length];
+      for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
+        if (dart.notNull(this.identicalInJs(this.values[dartx.get](i), value)))
+          return i;
+      }
+      this.values[dartx.add](value);
+      this.copies[dartx.add](null);
+      return length;
+    }
+    readSlot(i) {
+      return this.copies[dartx.get](i);
+    }
+    writeSlot(i, x) {
+      this.copies[dartx.set](i, x);
+    }
+    walk(e) {
+      if (e == null)
+        return e;
+      if (typeof e == 'boolean')
+        return e;
+      if (typeof e == 'number')
+        return e;
+      if (typeof e == 'string')
+        return e;
+      if (dart.notNull(isJavaScriptDate(e))) {
+        return convertNativeToDart_DateTime(e);
+      }
+      if (dart.notNull(isJavaScriptRegExp(e))) {
+        dart.throw(new core.UnimplementedError('structured clone of RegExp'));
+      }
+      if (dart.notNull(isJavaScriptPromise(e))) {
+        return convertNativePromiseToDartFuture(e);
+      }
+      if (dart.notNull(isJavaScriptSimpleObject(e))) {
+        let slot = this.findSlot(e);
+        let copy = this.readSlot(slot);
+        if (copy != null)
+          return copy;
+        copy = dart.map();
+        this.writeSlot(slot, copy);
+        this.forEachJsField(e, dart.fn(((key, value) => dart.dsetindex(copy, key, this.walk(value))).bind(this)));
+        return copy;
+      }
+      if (dart.notNull(isJavaScriptArray(e))) {
+        let slot = this.findSlot(e);
+        let copy = this.readSlot(slot);
+        if (copy != null)
+          return copy;
+        let length = dart.as(dart.dload(e, 'length'), core.int);
+        copy = dart.notNull(this.mustCopy) ? this.newDartList(length) : e;
+        this.writeSlot(slot, copy);
+        for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
+          dart.dsetindex(copy, i, this.walk(dart.dindex(e, i)));
+        }
+        return copy;
+      }
+      return e;
+    }
+    convertNativeToDart_AcceptStructuredClone(object, opts) {
+      let mustCopy = opts && 'mustCopy' in opts ? opts.mustCopy : false;
+      this.mustCopy = dart.as(mustCopy, core.bool);
+      let copy = this.walk(object);
+      return copy;
+    }
+  }
+  dart.setSignature(_AcceptStructuredClone, {
+    methods: () => ({
+      findSlot: [core.int, [dart.dynamic]],
+      readSlot: [dart.dynamic, [core.int]],
+      writeSlot: [dart.dynamic, [core.int, dart.dynamic]],
+      walk: [dart.dynamic, [dart.dynamic]],
+      convertNativeToDart_AcceptStructuredClone: [dart.dynamic, [dart.dynamic], {mustCopy: dart.dynamic}]
+    })
+  });
+  class _TypedContextAttributes extends core.Object {
+    _TypedContextAttributes(alpha, antialias, depth, failIfMajorPerformanceCaveat, premultipliedAlpha, preserveDrawingBuffer, stencil) {
+      this.alpha = alpha;
+      this.antialias = antialias;
+      this.depth = depth;
+      this.failIfMajorPerformanceCaveat = failIfMajorPerformanceCaveat;
+      this.premultipliedAlpha = premultipliedAlpha;
+      this.preserveDrawingBuffer = preserveDrawingBuffer;
+      this.stencil = stencil;
+    }
+  }
+  dart.setSignature(_TypedContextAttributes, {
+    constructors: () => ({_TypedContextAttributes: [_TypedContextAttributes, [core.bool, core.bool, core.bool, core.bool, core.bool, core.bool, core.bool]]})
+  });
+  function convertNativeToDart_ContextAttributes(nativeContextAttributes) {
+    if (dart.is(nativeContextAttributes, dart.dynamic)) {
+      return nativeContextAttributes;
+    }
+    return new _TypedContextAttributes(dart.as(nativeContextAttributes.alpha, core.bool), dart.as(nativeContextAttributes.antialias, core.bool), dart.as(nativeContextAttributes.depth, core.bool), dart.as(nativeContextAttributes.failIfMajorPerformanceCaveat, core.bool), dart.as(nativeContextAttributes.premultipliedAlpha, core.bool), dart.as(nativeContextAttributes.preserveDrawingBuffer, core.bool), dart.as(nativeContextAttributes.stencil, core.bool));
+  }
+  dart.fn(convertNativeToDart_ContextAttributes);
+  class _TypedImageData extends core.Object {
+    _TypedImageData(data, height, width) {
+      this.data = data;
+      this.height = height;
+      this.width = width;
+    }
+  }
+  dart.setSignature(_TypedImageData, {
+    constructors: () => ({_TypedImageData: [_TypedImageData, [typed_data.Uint8ClampedList, core.int, core.int]]})
+  });
+  function convertNativeToDart_ImageData(nativeImageData) {
+    0;
+    if (dart.is(nativeImageData, dart.dynamic)) {
+      let data = dart.dload(nativeImageData, 'data');
+      if (data.constructor === Array) {
+        if (typeof CanvasPixelArray !== "undefined") {
+          data.constructor = CanvasPixelArray;
+          data.BYTES_PER_ELEMENT = 1;
+        }
+      }
+      return nativeImageData;
+    }
+    return new _TypedImageData(dart.as(nativeImageData.data, typed_data.Uint8ClampedList), dart.as(nativeImageData.height, core.int), dart.as(nativeImageData.width, core.int));
+  }
+  dart.fn(convertNativeToDart_ImageData);
+  function convertDartToNative_ImageData(imageData) {
+    if (dart.is(imageData, _TypedImageData)) {
+      return {data: dart.dload(imageData, 'data'), height: dart.dload(imageData, 'height'), width: dart.dload(imageData, 'width')};
+    }
+    return imageData;
+  }
+  dart.fn(convertDartToNative_ImageData);
+  const _serializedScriptValue = 'num|String|bool|' + 'JSExtendableArray|=Object|' + 'Blob|File|NativeByteBuffer|NativeTypedData';
+  const annotation_Creates_SerializedScriptValue = dart.const(new _js_helper.Creates(_serializedScriptValue));
+  const annotation_Returns_SerializedScriptValue = dart.const(new _js_helper.Returns(_serializedScriptValue));
+  function convertNativeToDart_Dictionary(object) {
+    if (object == null)
+      return null;
+    let dict = dart.map();
+    let keys = Object.getOwnPropertyNames(object);
+    for (let key of dart.as(keys, core.Iterable)) {
+      dict.set(key, object[key]);
+    }
+    return dict;
+  }
+  dart.fn(convertNativeToDart_Dictionary, core.Map, [dart.dynamic]);
+  function convertDartToNative_Dictionary(dict, postCreate) {
+    if (postCreate === void 0)
+      postCreate = null;
+    if (dict == null)
+      return null;
+    let object = {};
+    if (postCreate != null) {
+      dart.dcall(postCreate, object);
+    }
+    dict.forEach(dart.fn((key, value) => {
+      object[key] = value;
+    }, dart.dynamic, [core.String, dart.dynamic]));
+    return object;
+  }
+  dart.fn(convertDartToNative_Dictionary, dart.dynamic, [core.Map], [dart.functionType(dart.void, [dart.dynamic])]);
+  function convertDartToNative_StringArray(input) {
+    return input;
+  }
+  dart.fn(convertDartToNative_StringArray, core.List, [core.List$(core.String)]);
+  function convertNativeToDart_DateTime(date) {
+    let millisSinceEpoch = date.getTime();
+    return new core.DateTime.fromMillisecondsSinceEpoch(millisSinceEpoch, {isUtc: true});
+  }
+  dart.fn(convertNativeToDart_DateTime, core.DateTime, [dart.dynamic]);
+  function convertDartToNative_DateTime(date) {
+    return new Date(date.millisecondsSinceEpoch);
+  }
+  dart.fn(convertDartToNative_DateTime, dart.dynamic, [core.DateTime]);
+  function convertDartToNative_PrepareForStructuredClone(value) {
+    return new _StructuredCloneDart2Js().convertDartToNative_PrepareForStructuredClone(value);
+  }
+  dart.fn(convertDartToNative_PrepareForStructuredClone);
+  function convertNativeToDart_AcceptStructuredClone(object, opts) {
+    let mustCopy = opts && 'mustCopy' in opts ? opts.mustCopy : false;
+    return new _AcceptStructuredCloneDart2Js().convertNativeToDart_AcceptStructuredClone(object, {mustCopy: mustCopy});
+  }
+  dart.fn(convertNativeToDart_AcceptStructuredClone, dart.dynamic, [dart.dynamic], {mustCopy: dart.dynamic});
+  class _StructuredCloneDart2Js extends _StructuredClone {
+    _StructuredCloneDart2Js() {
+      super._StructuredClone();
+    }
+    newJsMap() {
+      return {};
+    }
+    putIntoMap(map, key, value) {
+      return map[key] = value;
+    }
+    newJsList(length) {
+      return new Array(length);
+    }
+    cloneNotRequired(e) {
+      return dart.is(e, _native_typed_data.NativeByteBuffer) || dart.is(e, _native_typed_data.NativeTypedData);
+    }
+  }
+  dart.setSignature(_StructuredCloneDart2Js, {
+    methods: () => ({
+      newJsMap: [dart.dynamic, []],
+      putIntoMap: [dart.void, [dart.dynamic, dart.dynamic, dart.dynamic]],
+      newJsList: [dart.dynamic, [dart.dynamic]],
+      cloneNotRequired: [core.bool, [dart.dynamic]]
+    })
+  });
+  class _AcceptStructuredCloneDart2Js extends _AcceptStructuredClone {
+    _AcceptStructuredCloneDart2Js() {
+      super._AcceptStructuredClone();
+    }
+    newJsList(length) {
+      return new Array(length);
+    }
+    newDartList(length) {
+      return this.newJsList(length);
+    }
+    identicalInJs(a, b) {
+      return core.identical(a, b);
+    }
+    forEachJsField(object, action) {
+      for (let key of dart.as(Object.keys(object), core.Iterable)) {
+        dart.dcall(action, key, object[key]);
+      }
+    }
+  }
+  dart.setSignature(_AcceptStructuredCloneDart2Js, {
+    methods: () => ({
+      newJsList: [dart.dynamic, [dart.dynamic]],
+      newDartList: [dart.dynamic, [dart.dynamic]],
+      identicalInJs: [core.bool, [dart.dynamic, dart.dynamic]],
+      forEachJsField: [dart.void, [dart.dynamic, dart.dynamic]]
+    })
+  });
+  function isJavaScriptDate(value) {
+    return value instanceof Date;
+  }
+  dart.fn(isJavaScriptDate, core.bool, [dart.dynamic]);
+  function isJavaScriptRegExp(value) {
+    return value instanceof RegExp;
+  }
+  dart.fn(isJavaScriptRegExp, core.bool, [dart.dynamic]);
+  function isJavaScriptArray(value) {
+    return value instanceof Array;
+  }
+  dart.fn(isJavaScriptArray, core.bool, [dart.dynamic]);
+  function isJavaScriptSimpleObject(value) {
+    let proto = Object.getPrototypeOf(value);
+    return proto === Object.prototype || proto === null;
+  }
+  dart.fn(isJavaScriptSimpleObject, core.bool, [dart.dynamic]);
+  function isImmutableJavaScriptArray(value) {
+    return !!value.immutable$list;
+  }
+  dart.fn(isImmutableJavaScriptArray, core.bool, [dart.dynamic]);
+  function isJavaScriptPromise(value) {
+    return typeof Promise != "undefined" && value instanceof Promise;
+  }
+  dart.fn(isJavaScriptPromise, core.bool, [dart.dynamic]);
+  function convertNativePromiseToDartFuture(promise) {
+    let completer = async.Completer.new();
+    let then = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.complete(result), dart.void, [dart.dynamic]), 1);
+    let error = dart.dcall(/* Unimplemented unknown name */convertDartClosureToJS, dart.fn(result => completer.completeError(result), dart.void, [dart.dynamic]), 1);
+    let newPromise = promise.then(then).catch(error);
+    return completer.future;
+  }
+  dart.fn(convertNativePromiseToDartFuture, async.Future, [dart.dynamic]);
+  class Device extends core.Object {
+    static get userAgent() {
+      return dart.as(html.window.navigator.userAgent, core.String);
+    }
+    static get isOpera() {
+      if (Device._isOpera == null) {
+        Device._isOpera = Device.userAgent[dartx.contains]("Opera", 0);
+      }
+      return Device._isOpera;
+    }
+    static get isIE() {
+      if (Device._isIE == null) {
+        Device._isIE = !dart.notNull(Device.isOpera) && dart.notNull(Device.userAgent[dartx.contains]("Trident/", 0));
+      }
+      return Device._isIE;
+    }
+    static get isFirefox() {
+      if (Device._isFirefox == null) {
+        Device._isFirefox = Device.userAgent[dartx.contains]("Firefox", 0);
+      }
+      return Device._isFirefox;
+    }
+    static get isWebKit() {
+      if (Device._isWebKit == null) {
+        Device._isWebKit = !dart.notNull(Device.isOpera) && dart.notNull(Device.userAgent[dartx.contains]("WebKit", 0));
+      }
+      return Device._isWebKit;
+    }
+    static get cssPrefix() {
+      let prefix = Device._cachedCssPrefix;
+      if (prefix != null)
+        return prefix;
+      if (dart.notNull(Device.isFirefox)) {
+        prefix = '-moz-';
+      } else if (dart.notNull(Device.isIE)) {
+        prefix = '-ms-';
+      } else if (dart.notNull(Device.isOpera)) {
+        prefix = '-o-';
+      } else {
+        prefix = '-webkit-';
+      }
+      return Device._cachedCssPrefix = prefix;
+    }
+    static get propertyPrefix() {
+      let prefix = Device._cachedPropertyPrefix;
+      if (prefix != null)
+        return prefix;
+      if (dart.notNull(Device.isFirefox)) {
+        prefix = 'moz';
+      } else if (dart.notNull(Device.isIE)) {
+        prefix = 'ms';
+      } else if (dart.notNull(Device.isOpera)) {
+        prefix = 'o';
+      } else {
+        prefix = 'webkit';
+      }
+      return Device._cachedPropertyPrefix = prefix;
+    }
+    static isEventTypeSupported(eventType) {
+      try {
+        let e = html.Event.eventType(eventType, '');
+        return dart.is(e, html.Event);
+      } catch (_) {
+      }
+
+      return false;
+    }
+  }
+  dart.setSignature(Device, {
+    statics: () => ({isEventTypeSupported: [core.bool, [core.String]]}),
+    names: ['isEventTypeSupported']
+  });
+  Device._isOpera = null;
+  Device._isIE = null;
+  Device._isFirefox = null;
+  Device._isWebKit = null;
+  Device._cachedCssPrefix = null;
+  Device._cachedPropertyPrefix = null;
+  const _childNodes = Symbol('_childNodes');
+  const _node = Symbol('_node');
+  const _iterable = Symbol('_iterable');
+  const _filtered = Symbol('_filtered');
+  class FilteredElementList extends collection.ListBase$(html.Element) {
+    FilteredElementList(node) {
+      this[_childNodes] = node.nodes;
+      this[_node] = node;
+    }
+    get [_iterable]() {
+      return new _internal.WhereIterable(this[_childNodes], dart.fn(n => dart.is(n, html.Element), core.bool, [dart.dynamic]));
+    }
+    get [_filtered]() {
+      return core.List$(html.Element).from(this[_iterable], {growable: false});
+    }
+    forEach(f) {
+      this[_filtered][dartx.forEach](f);
+    }
+    set(index, value) {
+      this.get(index).replaceWith(value);
+      return value;
+    }
+    set length(newLength) {
+      let len = this.length;
+      if (dart.notNull(newLength) >= dart.notNull(len)) {
+        return;
+      } else if (dart.notNull(newLength) < 0) {
+        dart.throw(new core.ArgumentError("Invalid list length"));
+      }
+      this.removeRange(newLength, len);
+    }
+    add(value) {
+      this[_childNodes][dartx.add](value);
+    }
+    addAll(iterable) {
+      for (let element of iterable) {
+        this.add(element);
+      }
+    }
+    contains(needle) {
+      if (!dart.is(needle, html.Element))
+        return false;
+      let element = dart.as(needle, html.Element);
+      return dart.equals(element.parentNode, this[_node]);
+    }
+    get reversed() {
+      return this[_filtered][dartx.reversed];
+    }
+    sort(compare) {
+      if (compare === void 0)
+        compare = null;
+      dart.throw(new core.UnsupportedError('Cannot sort filtered list'));
+    }
+    setRange(start, end, iterable, skipCount) {
+      if (skipCount === void 0)
+        skipCount = 0;
+      dart.throw(new core.UnsupportedError('Cannot setRange on filtered list'));
+    }
+    fillRange(start, end, fillValue) {
+      if (fillValue === void 0)
+        fillValue = null;
+      dart.throw(new core.UnsupportedError('Cannot fillRange on filtered list'));
+    }
+    replaceRange(start, end, iterable) {
+      dart.throw(new core.UnsupportedError('Cannot replaceRange on filtered list'));
+    }
+    removeRange(start, end) {
+      core.List.from(this[_iterable][dartx.skip](start)[dartx.take](dart.notNull(end) - dart.notNull(start)))[dartx.forEach](dart.fn(el => dart.dsend(el, 'remove')));
+    }
+    clear() {
+      this[_childNodes][dartx.clear]();
+    }
+    removeLast() {
+      let result = this[_iterable][dartx.last];
+      if (result != null) {
+        result.remove();
+      }
+      return result;
+    }
+    insert(index, value) {
+      if (index == this.length) {
+        this.add(value);
+      } else {
+        let element = this[_iterable][dartx.elementAt](index);
+        element.parentNode.insertBefore(value, element);
+      }
+    }
+    insertAll(index, iterable) {
+      if (index == this.length) {
+        this.addAll(iterable);
+      } else {
+        let element = this[_iterable][dartx.elementAt](index);
+        element.parentNode.insertAllBefore(iterable, element);
+      }
+    }
+    removeAt(index) {
+      let result = this.get(index);
+      result.remove();
+      return result;
+    }
+    remove(element) {
+      if (!dart.is(element, html.Element))
+        return false;
+      if (dart.notNull(this.contains(element))) {
+        dart.as(element, html.Element).remove();
+        return true;
+      } else {
+        return false;
+      }
+    }
+    get length() {
+      return this[_iterable][dartx.length];
+    }
+    get(index) {
+      return this[_iterable][dartx.elementAt](index);
+    }
+    get iterator() {
+      return this[_filtered][dartx.iterator];
+    }
+    get rawList() {
+      return this[_node].childNodes;
+    }
+  }
+  FilteredElementList[dart.implements] = () => [NodeListWrapper];
+  dart.setSignature(FilteredElementList, {
+    constructors: () => ({FilteredElementList: [FilteredElementList, [html.Node]]}),
+    methods: () => ({
+      forEach: [dart.void, [dart.functionType(dart.void, [html.Element])]],
+      set: [dart.void, [core.int, html.Element]],
+      add: [dart.void, [html.Element]],
+      addAll: [dart.void, [core.Iterable$(html.Element)]],
+      sort: [dart.void, [], [dart.functionType(core.int, [html.Element, html.Element])]],
+      setRange: [dart.void, [core.int, core.int, core.Iterable$(html.Element)], [core.int]],
+      fillRange: [dart.void, [core.int, core.int], [html.Element]],
+      replaceRange: [dart.void, [core.int, core.int, core.Iterable$(html.Element)]],
+      removeLast: [html.Element, []],
+      insert: [dart.void, [core.int, html.Element]],
+      insertAll: [dart.void, [core.int, core.Iterable$(html.Element)]],
+      removeAt: [html.Element, [core.int]],
+      get: [html.Element, [core.int]]
+    })
+  });
+  dart.defineExtensionMembers(FilteredElementList, [
+    'forEach',
+    'set',
+    'add',
+    'addAll',
+    'contains',
+    'sort',
+    'setRange',
+    'fillRange',
+    'replaceRange',
+    'removeRange',
+    'clear',
+    'removeLast',
+    'insert',
+    'insertAll',
+    'removeAt',
+    'remove',
+    'get',
+    'length',
+    'reversed',
+    'length',
+    'iterator'
+  ]);
+  class Lists extends core.Object {
+    static indexOf(a, element, startIndex, endIndex) {
+      if (dart.notNull(startIndex) >= dart.notNull(a[dartx.length])) {
+        return -1;
+      }
+      if (dart.notNull(startIndex) < 0) {
+        startIndex = 0;
+      }
+      for (let i = startIndex; dart.notNull(i) < dart.notNull(endIndex); i = dart.notNull(i) + 1) {
+        if (dart.equals(a[dartx.get](i), element)) {
+          return i;
+        }
+      }
+      return -1;
+    }
+    static lastIndexOf(a, element, startIndex) {
+      if (dart.notNull(startIndex) < 0) {
+        return -1;
+      }
+      if (dart.notNull(startIndex) >= dart.notNull(a[dartx.length])) {
+        startIndex = dart.notNull(a[dartx.length]) - 1;
+      }
+      for (let i = startIndex; dart.notNull(i) >= 0; i = dart.notNull(i) - 1) {
+        if (dart.equals(a[dartx.get](i), element)) {
+          return i;
+        }
+      }
+      return -1;
+    }
+    static getRange(a, start, end, accumulator) {
+      if (dart.notNull(start) < 0)
+        dart.throw(new core.RangeError.value(start));
+      if (dart.notNull(end) < dart.notNull(start))
+        dart.throw(new core.RangeError.value(end));
+      if (dart.notNull(end) > dart.notNull(a[dartx.length]))
+        dart.throw(new core.RangeError.value(end));
+      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
+        accumulator[dartx.add](a[dartx.get](i));
+      }
+      return accumulator;
+    }
+  }
+  dart.setSignature(Lists, {
+    statics: () => ({
+      indexOf: [core.int, [core.List, core.Object, core.int, core.int]],
+      lastIndexOf: [core.int, [core.List, core.Object, core.int]],
+      getRange: [core.List, [core.List, core.int, core.int, core.List]]
+    }),
+    names: ['indexOf', 'lastIndexOf', 'getRange']
+  });
+  class NodeListWrapper extends core.Object {}
+  // Exports:
+  exports.CssClassSetImpl = CssClassSetImpl;
+  exports.convertDartToNative_SerializedScriptValue = convertDartToNative_SerializedScriptValue;
+  exports.convertNativeToDart_SerializedScriptValue = convertNativeToDart_SerializedScriptValue;
+  exports.convertNativeToDart_ContextAttributes = convertNativeToDart_ContextAttributes;
+  exports.convertNativeToDart_ImageData = convertNativeToDart_ImageData;
+  exports.convertDartToNative_ImageData = convertDartToNative_ImageData;
+  exports.annotation_Creates_SerializedScriptValue = annotation_Creates_SerializedScriptValue;
+  exports.annotation_Returns_SerializedScriptValue = annotation_Returns_SerializedScriptValue;
+  exports.convertNativeToDart_Dictionary = convertNativeToDart_Dictionary;
+  exports.convertDartToNative_Dictionary = convertDartToNative_Dictionary;
+  exports.convertDartToNative_StringArray = convertDartToNative_StringArray;
+  exports.convertNativeToDart_DateTime = convertNativeToDart_DateTime;
+  exports.convertDartToNative_DateTime = convertDartToNative_DateTime;
+  exports.convertDartToNative_PrepareForStructuredClone = convertDartToNative_PrepareForStructuredClone;
+  exports.convertNativeToDart_AcceptStructuredClone = convertNativeToDart_AcceptStructuredClone;
+  exports.isJavaScriptDate = isJavaScriptDate;
+  exports.isJavaScriptRegExp = isJavaScriptRegExp;
+  exports.isJavaScriptArray = isJavaScriptArray;
+  exports.isJavaScriptSimpleObject = isJavaScriptSimpleObject;
+  exports.isImmutableJavaScriptArray = isImmutableJavaScriptArray;
+  exports.isJavaScriptPromise = isJavaScriptPromise;
+  exports.convertNativePromiseToDartFuture = convertNativePromiseToDartFuture;
+  exports.Device = Device;
+  exports.FilteredElementList = FilteredElementList;
+  exports.Lists = Lists;
+  exports.NodeListWrapper = NodeListWrapper;
+});