cleans up sdk patching so we no longer have unresolved names

test/codegen/expect/_js_helper/_js_helper.js

+var _js_helper;
+(function(_js_helper) {
+  'use strict';
+  class _Patch extends dart.Object {
+    _Patch() {
+    }
+  }
+  let patch = new _Patch();
+  class InternalMap extends dart.Object {
+  }
+  // Function requiresPreamble: () → dynamic
+  function requiresPreamble() {
+  }
+  // Function isJsIndexable: (dynamic, dynamic) → bool
+  function isJsIndexable(object, record) {
+    if (record !== null) {
+      let result = _interceptors.dispatchRecordIndexability(record);
+      if (result !== null)
+        return dart.as(result, core.bool);
+    }
+    return dart.is(object, JavaScriptIndexingBehavior);
+  }
+  // Function S: (dynamic) → String
+  function S(value) {
+    if (typeof value == string)
+      return dart.as(value, core.String);
+    if (dart.is(value, core.num)) {
+      if (!dart.equals(value, 0)) {
+        return dart.as(_foreign_helper.JS('String', '"" + (#)', value), core.String);
+      }
+    } else if (true === value) {
+      return 'true';
+    } else if (false === value) {
+      return 'false';
+    } else if (value === null) {
+      return 'null';
+    }
+    let res = dart.dinvoke(value, 'toString');
+    if (!(typeof res == string))
+      throw new core.ArgumentError(value);
+    return dart.as(res, core.String);
+  }
+  // Function createInvocationMirror: (String, dynamic, dynamic, dynamic, dynamic) → dynamic
+  function createInvocationMirror(name, internalName, kind, arguments, argumentNames) {
+    return new JSInvocationMirror(name, internalName, kind, arguments, argumentNames);
+  }
+  // Function createUnmangledInvocationMirror: (Symbol, dynamic, dynamic, dynamic, dynamic) → dynamic
+  function createUnmangledInvocationMirror(symbol, internalName, kind, arguments, argumentNames) {
+    return new JSInvocationMirror(symbol, internalName, kind, arguments, argumentNames);
+  }
+  // Function throwInvalidReflectionError: (String) → void
+  function throwInvalidReflectionError(memberName) {
+    throw new core.UnsupportedError(`Can't use '${memberName}' in reflection ` + "because it is not included in a @MirrorsUsed annotation.");
+  }
+  // Function traceHelper: (String) → void
+  function traceHelper(method) {
+    if (_foreign_helper.JS('bool', '!this.cache')) {
+      _foreign_helper.JS('', 'this.cache = Object.create(null)');
+    }
+    if (_foreign_helper.JS('bool', '!this.cache[#]', method)) {
+      _foreign_helper.JS('', 'console.log(#)', method);
+      _foreign_helper.JS('', 'this.cache[#] = true', method);
+    }
+  }
+  class JSInvocationMirror extends dart.Object {
+    JSInvocationMirror(_memberName, _internalName, _kind, _arguments, _namedArgumentNames) {
+      this._memberName = _memberName;
+      this._internalName = _internalName;
+      this._kind = _kind;
+      this._arguments = _arguments;
+      this._namedArgumentNames = _namedArgumentNames;
+      this._namedIndices = null;
+    }
+    get memberName() {
+      if (dart.is(this._memberName, core.Symbol))
+        return dart.as(this._memberName, core.Symbol);
+      let name = dart.as(this._memberName, core.String);
+      let unmangledName = _js_names.mangledNames.get(name);
+      if (unmangledName !== null) {
+        name = unmangledName.split(':').get(0);
+      } else {
+        if (_js_names.mangledNames.get(this._internalName) === null) {
+          core.print(`Warning: '${name}' is used reflectively but not in MirrorsUsed. ` + "This will break minified code.");
+        }
+      }
+      this._memberName = new _internal.Symbol.unvalidated(name);
+      return dart.as(this._memberName, core.Symbol);
+    }
+    get isMethod() {
+      return this._kind === METHOD;
+    }
+    get isGetter() {
+      return this._kind === GETTER;
+    }
+    get isSetter() {
+      return this._kind === SETTER;
+    }
+    get isAccessor() {
+      return this._kind !== METHOD;
+    }
+    get positionalArguments() {
+      if (this.isGetter)
+        return /* Unimplemented const */new List.from([]);
+      let argumentCount = this._arguments.length - this._namedArgumentNames.length;
+      if (argumentCount === 0)
+        return /* Unimplemented const */new List.from([]);
+      let list = new List.from([]);
+      for (let index = 0; index < argumentCount; index++) {
+        list.add(this._arguments.get(index));
+      }
+      return dart.as(makeLiteralListConst(list), core.List);
+    }
+    get namedArguments() {
+      if (this.isAccessor)
+        return dart.map();
+      let namedArgumentCount = this._namedArgumentNames.length;
+      let namedArgumentsStartIndex = this._arguments.length - namedArgumentCount;
+      if (namedArgumentCount === 0)
+        return dart.map();
+      let map = new core.Map();
+      for (let i = 0; i < namedArgumentCount; i++) {
+        map.set(new _internal.Symbol.unvalidated(this._namedArgumentNames.get(i)), this._arguments.get(namedArgumentsStartIndex + i));
+      }
+      return map;
+    }
+    _getCachedInvocation(object) {
+      let interceptor = _interceptors.getInterceptor(object);
+      let receiver = object;
+      let name = this._internalName;
+      let arguments = this._arguments;
+      let interceptedNames = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.INTERCEPTED_NAMES, core.String));
+      let isIntercepted = dart.as(_foreign_helper.JS("bool", 'Object.prototype.hasOwnProperty.call(#, #)', interceptedNames, name), core.bool);
+      if (isIntercepted) {
+        receiver = interceptor;
+        if (_foreign_helper.JS('bool', '# === #', object, interceptor)) {
+          interceptor = null;
+        }
+      } else {
+        interceptor = null;
+      }
+      let isCatchAll = false;
+      let method = _foreign_helper.JS('var', '#[#]', receiver, name);
+      if (_foreign_helper.JS('bool', 'typeof # != "function"', method)) {
+        let baseName = _internal.Symbol.getName(dart.as(this.memberName, _internal.Symbol));
+        method = _foreign_helper.JS('', '#[# + "*"]', receiver, baseName);
+        if (method === null) {
+          interceptor = _interceptors.getInterceptor(object);
+          method = _foreign_helper.JS('', '#[# + "*"]', interceptor, baseName);
+          if (method !== null) {
+            isIntercepted = true;
+            receiver = interceptor;
+          } else {
+            interceptor = null;
+          }
+        }
+        isCatchAll = true;
+      }
+      if (_foreign_helper.JS('bool', 'typeof # == "function"', method)) {
+        if (isCatchAll) {
+          return new CachedCatchAllInvocation(name, method, isIntercepted, interceptor);
+        } else {
+          return new CachedInvocation(name, method, isIntercepted, interceptor);
+        }
+      } else {
+        return new CachedNoSuchMethodInvocation(interceptor);
+      }
+    }
+    static invokeFromMirror(invocation, victim) {
+      let cached = invocation._getCachedInvocation(victim);
+      if (dart.dload(cached, 'isNoSuchMethod')) {
+        return dart.dinvoke(cached, 'invokeOn', victim, invocation);
+      } else {
+        return dart.dinvoke(cached, 'invokeOn', victim, invocation._arguments);
+      }
+    }
+    static getCachedInvocation(invocation, victim) {
+      return invocation._getCachedInvocation(victim);
+    }
+  }
+  JSInvocationMirror.METHOD = 0;
+  JSInvocationMirror.GETTER = 1;
+  JSInvocationMirror.SETTER = 2;
+  class CachedInvocation extends dart.Object {
+    CachedInvocation(mangledName, jsFunction, isIntercepted, cachedInterceptor) {
+      this.mangledName = mangledName;
+      this.jsFunction = jsFunction;
+      this.isIntercepted = isIntercepted;
+      this.cachedInterceptor = cachedInterceptor;
+    }
+    get isNoSuchMethod() {
+      return false;
+    }
+    get isGetterStub() {
+      return dart.as(_foreign_helper.JS("bool", "!!#.$getterStub", this.jsFunction), core.bool);
+    }
+    invokeOn(victim, arguments) {
+      let receiver = victim;
+      if (!dart.notNull(this.isIntercepted)) {
+        if (!dart.is(arguments, _interceptors.JSArray))
+          arguments = new core.List.from(arguments);
+      } else {
+        arguments = new List.from([victim]);
+        arguments.addAll(arguments);
+        if (this.cachedInterceptor !== null)
+          receiver = this.cachedInterceptor;
+      }
+      return _foreign_helper.JS("var", "#.apply(#, #)", this.jsFunction, receiver, arguments);
+    }
+  }
+  class CachedCatchAllInvocation extends CachedInvocation {
+    CachedCatchAllInvocation(name, jsFunction, isIntercepted, cachedInterceptor) {
+      this.info = new ReflectionInfo(jsFunction);
+      super.CachedInvocation(name, jsFunction, isIntercepted, cachedInterceptor);
+    }
+    get isGetterStub() {
+      return false;
+    }
+    invokeOn(victim, arguments) {
+      let receiver = victim;
+      let providedArgumentCount = null;
+      let fullParameterCount = this.info.requiredParameterCount + this.info.optionalParameterCount;
+      if (!dart.notNull(this.isIntercepted)) {
+        if (dart.is(arguments, _interceptors.JSArray)) {
+          providedArgumentCount = arguments.length;
+          if (providedArgumentCount < fullParameterCount) {
+            arguments = new core.List.from(arguments);
+          }
+        } else {
+          arguments = new core.List.from(arguments);
+          providedArgumentCount = arguments.length;
+        }
+      } else {
+        arguments = new List.from([victim]);
+        arguments.addAll(arguments);
+        if (this.cachedInterceptor !== null)
+          receiver = this.cachedInterceptor;
+        providedArgumentCount = arguments.length - 1;
+      }
+      if (dart.notNull(this.info.areOptionalParametersNamed) && dart.notNull(providedArgumentCount > this.info.requiredParameterCount)) {
+        throw new UnimplementedNoSuchMethodError(`Invocation of unstubbed method '${this.info.reflectionName}'` + ` with ${arguments.length} arguments.`);
+      } else if (providedArgumentCount < this.info.requiredParameterCount) {
+        throw new UnimplementedNoSuchMethodError(`Invocation of unstubbed method '${this.info.reflectionName}'` + ` with ${providedArgumentCount} arguments (too few).`);
+      } else if (providedArgumentCount > fullParameterCount) {
+        throw new UnimplementedNoSuchMethodError(`Invocation of unstubbed method '${this.info.reflectionName}'` + ` with ${providedArgumentCount} arguments (too many).`);
+      }
+      for (let i = providedArgumentCount; i < fullParameterCount; i++) {
+        arguments.add(getMetadata(this.info.defaultValue(i)));
+      }
+      return _foreign_helper.JS("var", "#.apply(#, #)", this.jsFunction, receiver, arguments);
+    }
+  }
+  class CachedNoSuchMethodInvocation extends dart.Object {
+    CachedNoSuchMethodInvocation(interceptor) {
+      this.interceptor = interceptor;
+    }
+    get isNoSuchMethod() {
+      return true;
+    }
+    get isGetterStub() {
+      return false;
+    }
+    invokeOn(victim, invocation) {
+      let receiver = this.interceptor === null ? victim : this.interceptor;
+      return dart.dinvoke(receiver, 'noSuchMethod', invocation);
+    }
+  }
+  class ReflectionInfo extends dart.Object {
+    ReflectionInfo$internal(jsFunction, data, isAccessor, requiredParameterCount, optionalParameterCount, areOptionalParametersNamed, functionType) {
+      this.jsFunction = jsFunction;
+      this.data = data;
+      this.isAccessor = isAccessor;
+      this.requiredParameterCount = requiredParameterCount;
+      this.optionalParameterCount = optionalParameterCount;
+      this.areOptionalParametersNamed = areOptionalParametersNamed;
+      this.functionType = functionType;
+      this.cachedSortedIndices = null;
+    }
+    ReflectionInfo(jsFunction) {
+      let data = dart.as(_foreign_helper.JS('JSExtendableArray|Null', '#.$reflectionInfo', jsFunction), core.List);
+      if (data === null)
+        return null;
+      data = _interceptors.JSArray.markFixedList(data);
+      let requiredParametersInfo = dart.as(_foreign_helper.JS('int', '#[#]', data, REQUIRED_PARAMETERS_INFO), core.int);
+      let requiredParameterCount = dart.as(_foreign_helper.JS('int', '# >> 1', requiredParametersInfo), core.int);
+      let isAccessor = (requiredParametersInfo & 1) === 1;
+      let optionalParametersInfo = dart.as(_foreign_helper.JS('int', '#[#]', data, OPTIONAL_PARAMETERS_INFO), core.int);
+      let optionalParameterCount = dart.as(_foreign_helper.JS('int', '# >> 1', optionalParametersInfo), core.int);
+      let areOptionalParametersNamed = (optionalParametersInfo & 1) === 1;
+      let functionType = _foreign_helper.JS('', '#[#]', data, FUNCTION_TYPE_INDEX);
+      return new ReflectionInfo.internal(jsFunction, data, isAccessor, requiredParameterCount, optionalParameterCount, areOptionalParametersNamed, functionType);
+    }
+    parameterName(parameter) {
+      let metadataIndex = null;
+      if (_foreign_helper.JS_GET_FLAG('MUST_RETAIN_METADATA')) {
+        metadataIndex = dart.as(_foreign_helper.JS('int', '#[2 * # + # + #]', this.data, parameter, this.optionalParameterCount, FIRST_DEFAULT_ARGUMENT), core.int);
+      } else {
+        metadataIndex = dart.as(_foreign_helper.JS('int', '#[# + # + #]', this.data, parameter, this.optionalParameterCount, FIRST_DEFAULT_ARGUMENT), core.int);
+      }
+      let metadata = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.METADATA, core.String));
+      return dart.as(_foreign_helper.JS('String', '#[#]', metadata, metadataIndex), core.String);
+    }
+    parameterMetadataAnnotations(parameter) {
+      if (!dart.notNull(_foreign_helper.JS_GET_FLAG('MUST_RETAIN_METADATA'))) {
+        throw new core.StateError('metadata has not been preserved');
+      } else {
+        return dart.as(_foreign_helper.JS('', '#[2 * # + # + # + 1]', this.data, parameter, this.optionalParameterCount, FIRST_DEFAULT_ARGUMENT), core.List$(core.int));
+      }
+    }
+    defaultValue(parameter) {
+      if (parameter < this.requiredParameterCount)
+        return dart.as(null, core.int);
+      return dart.as(_foreign_helper.JS('int', '#[# + # - #]', this.data, FIRST_DEFAULT_ARGUMENT, parameter, this.requiredParameterCount), core.int);
+    }
+    defaultValueInOrder(parameter) {
+      if (parameter < this.requiredParameterCount)
+        return dart.as(null, core.int);
+      if (dart.notNull(!dart.notNull(this.areOptionalParametersNamed)) || dart.notNull(this.optionalParameterCount === 1)) {
+        return this.defaultValue(parameter);
+      }
+      let index = this.sortedIndex(parameter - this.requiredParameterCount);
+      return this.defaultValue(index);
+    }
+    parameterNameInOrder(parameter) {
+      if (parameter < this.requiredParameterCount)
+        return null;
+      if (dart.notNull(!dart.notNull(this.areOptionalParametersNamed)) || dart.notNull(this.optionalParameterCount === 1)) {
+        return this.parameterName(parameter);
+      }
+      let index = this.sortedIndex(parameter - this.requiredParameterCount);
+      return this.parameterName(index);
+    }
+    sortedIndex(unsortedIndex) {
+      if (this.cachedSortedIndices === null) {
+        this.cachedSortedIndices = new core.List(this.optionalParameterCount);
+        let positions = dart.map();
+        for (let i = 0; i < this.optionalParameterCount; i++) {
+          let index = this.requiredParameterCount + i;
+          positions.set(this.parameterName(index), index);
+        }
+        let index = 0;
+        ((_) => {
+          _.sort();
+          return _;
+        }).bind(this)(positions.keys.toList()).forEach(((name) => {
+          this.cachedSortedIndices.set(index++, positions.get(name));
+        }).bind(this));
+      }
+      return dart.as(this.cachedSortedIndices.get(unsortedIndex), core.int);
+    }
+    computeFunctionRti(jsConstructor) {
+      if (_foreign_helper.JS('bool', 'typeof # == "number"', this.functionType)) {
+        return getMetadata(dart.as(this.functionType, core.int));
+      } else if (_foreign_helper.JS('bool', 'typeof # == "function"', this.functionType)) {
+        let fakeInstance = _foreign_helper.JS('', 'new #()', jsConstructor);
+        setRuntimeTypeInfo(fakeInstance, _foreign_helper.JS('JSExtendableArray', '#["<>"]', fakeInstance));
+        return _foreign_helper.JS('=Object|Null', '#.apply({$receiver:#})', this.functionType, fakeInstance);
+      } else {
+        throw new RuntimeError('Unexpected function type');
+      }
+    }
+    get reflectionName() {
+      return dart.as(_foreign_helper.JS('String', '#.$reflectionName', this.jsFunction), core.String);
+    }
+  }
+  dart.defineNamedConstructor(ReflectionInfo, 'internal');
+  ReflectionInfo.REQUIRED_PARAMETERS_INFO = 0;
+  ReflectionInfo.OPTIONAL_PARAMETERS_INFO = 1;
+  ReflectionInfo.FUNCTION_TYPE_INDEX = 2;
+  ReflectionInfo.FIRST_DEFAULT_ARGUMENT = 3;
+  // Function getMetadata: (int) → dynamic
+  function getMetadata(index) {
+    let metadata = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.METADATA, core.String));
+    return _foreign_helper.JS('', '#[#]', metadata, index);
+  }
+  class Primitives extends dart.Object {
+    static initializeStatics(id) {
+      mirrorFunctionCacheName = `_${id}`;
+      mirrorInvokeCacheName = `_${id}`;
+    }
+    static objectHashCode(object) {
+      let hash = dart.as(_foreign_helper.JS('int|Null', '#.$identityHash', object), core.int);
+      if (hash === null) {
+        hash = dart.as(_foreign_helper.JS('int', '(Math.random() * 0x3fffffff) | 0'), core.int);
+        _foreign_helper.JS('void', '#.$identityHash = #', object, hash);
+      }
+      return dart.as(_foreign_helper.JS('int', '#', hash), core.int);
+    }
+    static _throwFormatException(string) {
+      throw new core.FormatException(string);
+    }
+    static parseInt(source, radix, handleError) {
+      if (handleError === null)
+        handleError = dart.as(_throwFormatException, dart.throw_("Unimplemented type (String) → int"));
+      checkString(source);
+      let match = _foreign_helper.JS('JSExtendableArray|Null', '/^\\s*[+-]?((0x[a-f0-9]+)|(\\d+)|([a-z0-9]+))\\s*$/i.exec(#)', source);
+      let digitsIndex = 1;
+      let hexIndex = 2;
+      let decimalIndex = 3;
+      let nonDecimalHexIndex = 4;
+      if (radix === null) {
+        radix = 10;
+        if (match !== null) {
+          if (dart.dindex(match, hexIndex) !== null) {
+            return dart.as(_foreign_helper.JS('num', 'parseInt(#, 16)', source), core.int);
+          }
+          if (dart.dindex(match, decimalIndex) !== null) {
+            return dart.as(_foreign_helper.JS('num', 'parseInt(#, 10)', source), core.int);
+          }
+          return handleError(source);
+        }
+      } else {
+        if (!(typeof radix == number))
+          throw new core.ArgumentError("Radix is not an integer");
+        if (dart.notNull(radix < 2) || dart.notNull(radix > 36)) {
+          throw new core.RangeError(`Radix ${radix} not in range 2..36`);
+        }
+        if (match !== null) {
+          if (dart.notNull(radix === 10) && dart.notNull(dart.dindex(match, decimalIndex) !== null)) {
+            return dart.as(_foreign_helper.JS('num', 'parseInt(#, 10)', source), core.int);
+          }
+          if (dart.notNull(radix < 10) || dart.notNull(dart.dindex(match, decimalIndex) === null)) {
+            let maxCharCode = null;
+            if (radix <= 10) {
+              maxCharCode = 48 + radix - 1;
+            } else {
+              maxCharCode = 97 + radix - 10 - 1;
+            }
+            let digitsPart = dart.as(dart.dindex(match, digitsIndex), core.String);
+            for (let i = 0; i < digitsPart.length; i++) {
+              let characterCode = digitsPart.codeUnitAt(0) | 32;
+              if (digitsPart.codeUnitAt(i) > maxCharCode) {
+                return handleError(source);
+              }
+            }
+          }
+        }
+      }
+      if (match === null)
+        return handleError(source);
+      return dart.as(_foreign_helper.JS('num', 'parseInt(#, #)', source, radix), core.int);
+    }
+    static parseDouble(source, handleError) {
+      checkString(source);
+      if (handleError === null)
+        handleError = dart.as(_throwFormatException, dart.throw_("Unimplemented type (String) → double"));
+      if (dart.throw_("Unimplemented PrefixExpression: !JS('bool', r'/^\\s*[+-]?(?:Infinity|NaN|' r'(?:\\.\\d+|\\d+(?:\\.\\d*)?)(?:[eE][+-]?\\d+)?)\\s*$/.test(#)', source)")) {
+        return handleError(source);
+      }
+      let result = _foreign_helper.JS('num', 'parseFloat(#)', source);
+      if (dart.dload(result, 'isNaN')) {
+        let trimmed = source.trim();
+        if (dart.notNull(dart.notNull(dart.equals(trimmed, 'NaN')) || dart.notNull(dart.equals(trimmed, '+NaN'))) || dart.notNull(dart.equals(trimmed, '-NaN'))) {
+          return dart.as(result, core.double);
+        }
+        return handleError(source);
+      }
+      return dart.as(result, core.double);
+    }
+    static formatType(className, typeArguments) {
+      return _js_names.unmangleAllIdentifiersIfPreservedAnyways(`${className}${joinArguments(typeArguments, 0)}`);
+    }
+    static objectTypeName(object) {
+      let name = constructorNameFallback(_interceptors.getInterceptor(object));
+      if (dart.equals(name, 'Object')) {
+        let decompiled = _foreign_helper.JS('var', '#.match(/^\\s*function\\s*(\\S*)\\s*\\(/)[1]', _foreign_helper.JS('var', 'String(#.constructor)', object));
+        if (typeof decompiled == string)
+          if (_foreign_helper.JS('bool', '/^\\w+$/.test(#)', decompiled))
+            name = dart.as(decompiled, core.String);
+      }
+      if (dart.notNull(name.length > 1) && dart.notNull(core.identical(name.codeUnitAt(0), DOLLAR_CHAR_VALUE))) {
+        name = name.substring(1);
+      }
+      return formatType(name, dart.as(getRuntimeTypeInfo(object), core.List));
+    }
+    static objectToString(object) {
+      let name = objectTypeName(object);
+      return `Instance of '${name}'`;
+    }
+    static dateNow() {
+      return dart.as(_foreign_helper.JS('int', 'Date.now()'), core.num);
+    }
+    static initTicker() {
+      if (timerFrequency !== null)
+        return;
+      timerFrequency = 1000;
+      timerTicks = dateNow;
+      if (_foreign_helper.JS('bool', 'typeof window == "undefined"'))
+        return;
+      let window = _foreign_helper.JS('var', 'window');
+      if (window === null)
+        return;
+      let performance = _foreign_helper.JS('var', '#.performance', window);
+      if (performance === null)
+        return;
+      if (_foreign_helper.JS('bool', 'typeof #.now != "function"', performance))
+        return;
+      timerFrequency = 1000000;
+      timerTicks = (() => 1000['*'](_foreign_helper.JS('num', '#.now()', performance)).floor()).bind(this);
+    }
+    static get isD8() {
+      return dart.as(_foreign_helper.JS('bool', 'typeof version == "function"' + ' && typeof os == "object" && "system" in os'), core.bool);
+    }
+    static get isJsshell() {
+      return dart.as(_foreign_helper.JS('bool', 'typeof version == "function" && typeof system == "function"'), core.bool);
+    }
+    static currentUri() {
+      requiresPreamble();
+      if (_foreign_helper.JS('bool', '!!self.location')) {
+        return dart.as(_foreign_helper.JS('String', 'self.location.href'), core.String);
+      }
+      return null;
+    }
+    static _fromCharCodeApply(array) {
+      let result = "";
+      let kMaxApply = 500;
+      let end = array.length;
+      for (let i = 0; i < end; i = kMaxApply) {
+        let subarray = null;
+        if (end <= kMaxApply) {
+          subarray = array;
+        } else {
+          subarray = _foreign_helper.JS('JSExtendableArray', '#.slice(#, #)', array, i, i + kMaxApply < end ? i + kMaxApply : end);
+        }
+        result = dart.as(_foreign_helper.JS('String', '# + String.fromCharCode.apply(#, #)', result, null, subarray), core.String);
+      }
+      return result;
+    }
+    static stringFromCodePoints(codePoints) {
+      let a = new List.from([]);
+      for (let i of codePoints) {
+        if (!(typeof i == number))
+          throw new core.ArgumentError(i);
+        if (dart.dbinary(i, '<=', 65535)) {
+          a.add(dart.as(i, core.int));
+        } else if (dart.dbinary(i, '<=', 1114111)) {
+          a.add(dart.notNull(55296['+'](dart.dbinary(dart.dbinary(dart.dbinary(i, '-', 65536), '>>', 10), '&', 1023))));
+          a.add(dart.notNull(56320['+'](dart.dbinary(i, '&', 1023))));
+        } else {
+          throw new core.ArgumentError(i);
+        }
+      }
+      return _fromCharCodeApply(a);
+    }
+    static stringFromCharCodes(charCodes) {
+      for (let i of charCodes) {
+        if (!(typeof i == number))
+          throw new core.ArgumentError(i);
+        if (dart.dbinary(i, '<', 0))
+          throw new core.ArgumentError(i);
+        if (dart.dbinary(i, '>', 65535))
+          return stringFromCodePoints(charCodes);
+      }
+      return _fromCharCodeApply(dart.as(charCodes, core.List$(core.int)));
+    }
+    static stringFromCharCode(charCode) {
+      if (0['<='](charCode)) {
+        if (dart.dbinary(charCode, '<=', 65535)) {
+          return dart.as(_foreign_helper.JS('String', 'String.fromCharCode(#)', charCode), core.String);
+        }
+        if (dart.dbinary(charCode, '<=', 1114111)) {
+          let bits = dart.dbinary(charCode, '-', 65536);
+          let low = 56320['|'](dart.dbinary(bits, '&', 1023));
+          let high = 55296['|'](dart.dbinary(bits, '>>', 10));
+          return dart.as(_foreign_helper.JS('String', 'String.fromCharCode(#, #)', high, low), core.String);
+        }
+      }
+      throw new core.RangeError.range(charCode, 0, 1114111);
+    }
+    static stringConcatUnchecked(string1, string2) {
+      return _foreign_helper.JS_STRING_CONCAT(string1, string2);
+    }
+    static flattenString(str) {
+      return dart.as(_foreign_helper.JS('String', "#.charCodeAt(0) == 0 ? # : #", str, str, str), core.String);
+    }
+    static getTimeZoneName(receiver) {
+      let d = lazyAsJsDate(receiver);
+      let match = dart.as(_foreign_helper.JS('JSArray|Null', '/\\((.*)\\)/.exec(#.toString())', d), core.List);
+      if (match !== null)
+        return dart.as(match.get(1), core.String);
+      match = dart.as(_foreign_helper.JS('JSArray|Null', '/^[A-Z,a-z]{3}\\s' + '[A-Z,a-z]{3}\\s\\d+\\s' + '\\d{2}:\\d{2}:\\d{2}\\s' + '([A-Z]{3,5})\\s' + '\\d{4}$/' + '.exec(#.toString())', d), core.List);
+      if (match !== null)
+        return dart.as(match.get(1), core.String);
+      match = dart.as(_foreign_helper.JS('JSArray|Null', '/(?:GMT|UTC)[+-]\\d{4}/.exec(#.toString())', d), core.List);
+      if (match !== null)
+        return dart.as(match.get(0), core.String);
+      return "";
+    }
+    static getTimeZoneOffsetInMinutes(receiver) {
+      return dart.as(dart.throw_("Unimplemented PrefixExpression: -JS('int', r'#.getTimezoneOffset()', lazyAsJsDate(receiver))"), core.int);
+    }
+    static valueFromDecomposedDate(years, month, day, hours, minutes, seconds, milliseconds, isUtc) {
+      let MAX_MILLISECONDS_SINCE_EPOCH = 8640000000000000;
+      checkInt(years);
+      checkInt(month);
+      checkInt(day);
+      checkInt(hours);
+      checkInt(minutes);
+      checkInt(seconds);
+      checkInt(milliseconds);
+      checkBool(isUtc);
+      let jsMonth = dart.dbinary(month, '-', 1);
+      let value = null;
+      if (isUtc) {
+        value = _foreign_helper.JS('num', 'Date.UTC(#, #, #, #, #, #, #)', years, jsMonth, day, hours, minutes, seconds, milliseconds);
+      } else {
+        value = _foreign_helper.JS('num', 'new Date(#, #, #, #, #, #, #).valueOf()', years, jsMonth, day, hours, minutes, seconds, milliseconds);
+      }
+      if (core.bool['||'](dart.dbinary(dart.dload(value, 'isNaN'), '||', dart.dbinary(value, '<', -MAX_MILLISECONDS_SINCE_EPOCH)), dart.dbinary(value, '>', MAX_MILLISECONDS_SINCE_EPOCH))) {
+        return null;
+      }
+      if (dart.dbinary(dart.dbinary(years, '<=', 0), '||', dart.dbinary(years, '<', 100)))
+        return patchUpY2K(value, years, isUtc);
+      return value;
+    }
+    static patchUpY2K(value, years, isUtc) {
+      let date = _foreign_helper.JS('', 'new Date(#)', value);
+      if (isUtc) {
+        _foreign_helper.JS('num', '#.setUTCFullYear(#)', date, years);
+      } else {
+        _foreign_helper.JS('num', '#.setFullYear(#)', date, years);
+      }
+      return _foreign_helper.JS('num', '#.valueOf()', date);
+    }
+    static lazyAsJsDate(receiver) {
+      if (_foreign_helper.JS('bool', '#.date === (void 0)', receiver)) {
+        _foreign_helper.JS('void', '#.date = new Date(#)', receiver, dart.dload(receiver, 'millisecondsSinceEpoch'));
+      }
+      return _foreign_helper.JS('var', '#.date', receiver);
+    }
+    static getYear(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCFullYear() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getFullYear() + 0)', lazyAsJsDate(receiver));
+    }
+    static getMonth(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '#.getUTCMonth() + 1', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '#.getMonth() + 1', lazyAsJsDate(receiver));
+    }
+    static getDay(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCDate() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getDate() + 0)', lazyAsJsDate(receiver));
+    }
+    static getHours(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCHours() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getHours() + 0)', lazyAsJsDate(receiver));
+    }
+    static getMinutes(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCMinutes() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getMinutes() + 0)', lazyAsJsDate(receiver));
+    }
+    static getSeconds(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCSeconds() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getSeconds() + 0)', lazyAsJsDate(receiver));
+    }
+    static getMilliseconds(receiver) {
+      return dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '(#.getUTCMilliseconds() + 0)', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '(#.getMilliseconds() + 0)', lazyAsJsDate(receiver));
+    }
+    static getWeekday(receiver) {
+      let weekday = dart.as(dart.dload(receiver, 'isUtc') ? _foreign_helper.JS('int', '#.getUTCDay() + 0', lazyAsJsDate(receiver)) : _foreign_helper.JS('int', '#.getDay() + 0', lazyAsJsDate(receiver)), core.int);
+      return (weekday + 6) % 7 + 1;
+    }
+    static valueFromDateString(str) {
+      if (!(typeof str == string))
+        throw new core.ArgumentError(str);
+      let value = _foreign_helper.JS('num', 'Date.parse(#)', str);
+      if (dart.dload(value, 'isNaN'))
+        throw new core.ArgumentError(str);
+      return value;
+    }
+    static getProperty(object, key) {
+      if (dart.notNull(dart.notNull(dart.notNull(object === null) || dart.notNull(typeof object == boolean)) || dart.notNull(dart.is(object, core.num))) || dart.notNull(typeof object == string)) {
+        throw new core.ArgumentError(object);
+      }
+      return _foreign_helper.JS('var', '#[#]', object, key);
+    }
+    static setProperty(object, key, value) {
+      if (dart.notNull(dart.notNull(dart.notNull(object === null) || dart.notNull(typeof object == boolean)) || dart.notNull(dart.is(object, core.num))) || dart.notNull(typeof object == string)) {
+        throw new core.ArgumentError(object);
+      }
+      _foreign_helper.JS('void', '#[#] = #', object, key, value);
+    }
+    static functionNoSuchMethod(function, positionalArguments, namedArguments) {
+      let argumentCount = 0;
+      let arguments = new List.from([]);
+      let namedArgumentList = new List.from([]);
+      if (positionalArguments !== null) {
+        argumentCount = positionalArguments.length;
+        arguments.addAll(positionalArguments);
+      }
+      let names = '';
+      if (dart.notNull(namedArguments !== null) && dart.notNull(!dart.notNull(namedArguments.isEmpty))) {
+        namedArguments.forEach(((name, argument) => {
+          names = `${names}$${name}`;
+          namedArgumentList.add(name);
+          arguments.add(argument);
+          argumentCount++;
+        }).bind(this));
+      }
+      let selectorName = `${_foreign_helper.JS_GET_NAME("CALL_PREFIX")}$${argumentCount}${names}`;
+      return dart.dinvoke(function, 'noSuchMethod', createUnmangledInvocationMirror(dart.throw_("Unimplemented SymbolLiteral: #call"), selectorName, JSInvocationMirror.METHOD, arguments, namedArgumentList));
+    }
+    static applyFunction(function, positionalArguments, namedArguments) {
+      return namedArguments === null ? applyFunctionWithPositionalArguments(function, positionalArguments) : applyFunctionWithNamedArguments(function, positionalArguments, namedArguments);
+    }
+    static applyFunctionWithPositionalArguments(function, positionalArguments) {
+      let argumentCount = 0;
+      let arguments = null;
+      if (positionalArguments !== null) {
+        if (_foreign_helper.JS('bool', '# instanceof Array', positionalArguments)) {
+          arguments = positionalArguments;
+        } else {
+          arguments = new core.List.from(positionalArguments);
+        }
+        argumentCount = dart.as(_foreign_helper.JS('int', '#.length', arguments), core.int);
+      } else {
+        arguments = new List.from([]);
+      }
+      let selectorName = `${_foreign_helper.JS_GET_NAME("CALL_PREFIX")}$${argumentCount}`;
+      let jsFunction = _foreign_helper.JS('var', '#[#]', function, selectorName);
+      if (jsFunction === null) {
+        return functionNoSuchMethod(function, positionalArguments, null);
+      }
+      return _foreign_helper.JS('var', '#.apply(#, #)', jsFunction, function, arguments);
+    }
+    static applyFunctionWithNamedArguments(function, positionalArguments, namedArguments) {
+      if (namedArguments.isEmpty) {
+        return applyFunctionWithPositionalArguments(function, positionalArguments);
+      }
+      let interceptor = _interceptors.getInterceptor(function);
+      let jsFunction = _foreign_helper.JS('', '#["call*"]', interceptor);
+      if (jsFunction === null) {
+        return functionNoSuchMethod(function, positionalArguments, namedArguments);
+      }
+      let info = new ReflectionInfo(jsFunction);
+      if (dart.notNull(info === null) || dart.notNull(!dart.notNull(info.areOptionalParametersNamed))) {
+        return functionNoSuchMethod(function, positionalArguments, namedArguments);
+      }
+      if (positionalArguments !== null) {
+        positionalArguments = new core.List.from(positionalArguments);
+      } else {
+        positionalArguments = new List.from([]);
+      }
+      if (info.requiredParameterCount !== positionalArguments.length) {
+        return functionNoSuchMethod(function, positionalArguments, namedArguments);
+      }
+      let defaultArguments = new core.Map();
+      for (let i = 0; i < info.optionalParameterCount; i++) {
+        let index = i + info.requiredParameterCount;
+        let parameterName = info.parameterNameInOrder(index);
+        let value = info.defaultValueInOrder(index);
+        let defaultValue = getMetadata(value);
+        defaultArguments.set(parameterName, defaultValue);
+      }
+      let bad = false;
+      namedArguments.forEach(((parameter, value) => {
+        if (defaultArguments.containsKey(parameter)) {
+          defaultArguments.set(parameter, value);
+        } else {
+          bad = true;
+        }
+      }).bind(this));
+      if (bad) {
+        return functionNoSuchMethod(function, positionalArguments, namedArguments);
+      }
+      positionalArguments.addAll(defaultArguments.values);
+      return _foreign_helper.JS('', '#.apply(#, #)', jsFunction, function, positionalArguments);
+    }
+    static _mangledNameMatchesType(mangledName, type) {
+      return _foreign_helper.JS('bool', '# == #', mangledName, type._typeName);
+    }
+    static identicalImplementation(a, b) {
+      return dart.as(_foreign_helper.JS('bool', '# == null', a) ? _foreign_helper.JS('bool', '# == null', b) : _foreign_helper.JS('bool', '# === #', a, b), core.bool);
+    }
+    static extractStackTrace(error) {
+      return getTraceFromException(_foreign_helper.JS('', '#.$thrownJsError', error));
+    }
+  }
+  Primitives.mirrorFunctionCacheName = '$cachedFunction';
+  Primitives.mirrorInvokeCacheName = '$cachedInvocation';
+  Primitives.DOLLAR_CHAR_VALUE = 36;
+  Primitives.timerFrequency = null;
+  Primitives.timerTicks = null;
+  class JsCache extends dart.Object {
+    static allocate() {
+      let result = _foreign_helper.JS('=Object', 'Object.create(null)');
+      _foreign_helper.JS('void', '#.x=0', result);
+      _foreign_helper.JS('void', 'delete #.x', result);
+      return result;
+    }
+    static fetch(cache, key) {
+      return _foreign_helper.JS('', '#[#]', cache, key);
+    }
+    static update(cache, key, value) {
+      _foreign_helper.JS('void', '#[#] = #', cache, key, value);
+    }
+  }
+  // Function iae: (dynamic) → dynamic
+  function iae(argument) {
+    throw new core.ArgumentError(argument);
+  }
+  // Function ioore: (dynamic, dynamic) → dynamic
+  function ioore(receiver, index) {
+    if (receiver === null)
+      dart.dload(receiver, 'length');
+    if (!(typeof index == number))
+      iae(index);
+    throw new core.RangeError.value(index);
+  }
+  // Function stringLastIndexOfUnchecked: (dynamic, dynamic, dynamic) → dynamic
+  function stringLastIndexOfUnchecked(receiver, element, start) {
+    return _foreign_helper.JS('int', '#.lastIndexOf(#, #)', receiver, element, start);
+  }
+  // Function checkNull: (dynamic) → dynamic
+  function checkNull(object) {
+    if (object === null)
+      throw new core.ArgumentError(null);
+    return object;
+  }
+  // Function checkNum: (dynamic) → dynamic
+  function checkNum(value) {
+    if (!dart.is(value, core.num)) {
+      throw new core.ArgumentError(value);
+    }
+    return value;
+  }
+  // Function checkInt: (dynamic) → dynamic
+  function checkInt(value) {
+    if (!(typeof value == number)) {
+      throw new core.ArgumentError(value);
+    }
+    return value;
+  }
+  // Function checkBool: (dynamic) → dynamic
+  function checkBool(value) {
+    if (!(typeof value == boolean)) {
+      throw new core.ArgumentError(value);
+    }
+    return value;
+  }
+  // Function checkString: (dynamic) → dynamic
+  function checkString(value) {
+    if (!(typeof value == string)) {
+      throw new core.ArgumentError(value);
+    }
+    return value;
+  }
+  // Function wrapException: (dynamic) → dynamic
+  function wrapException(ex) {
+    if (ex === null)
+      ex = new core.NullThrownError();
+    let wrapper = _foreign_helper.JS('', 'new Error()');
+    _foreign_helper.JS('void', '#.dartException = #', wrapper, ex);
+    if (_foreign_helper.JS('bool', '"defineProperty" in Object')) {
+      _foreign_helper.JS('void', 'Object.defineProperty(#, "message", { get: # })', wrapper, _foreign_helper.DART_CLOSURE_TO_JS(toStringWrapper));
+      _foreign_helper.JS('void', '#.name = ""', wrapper);
+    } else {
+      _foreign_helper.JS('void', '#.toString = #', wrapper, _foreign_helper.DART_CLOSURE_TO_JS(toStringWrapper));
+    }
+    return wrapper;
+  }
+  // Function toStringWrapper: () → dynamic
+  function toStringWrapper() {
+    return dart.dinvoke(_foreign_helper.JS('', 'this.dartException'), 'toString');
+  }
+  // Function throwExpression: (dynamic) → dynamic
+  function throwExpression(ex) {
+    _foreign_helper.JS('void', 'throw #', wrapException(ex));
+  }
+  // Function makeLiteralListConst: (dynamic) → dynamic
+  function makeLiteralListConst(list) {
+    _foreign_helper.JS('bool', '#.immutable$list = #', list, true);
+    _foreign_helper.JS('bool', '#.fixed$length = #', list, true);
+    return list;
+  }
+  // Function throwRuntimeError: (dynamic) → dynamic
+  function throwRuntimeError(message) {
+    throw new RuntimeError(message);
+  }
+  // Function throwAbstractClassInstantiationError: (dynamic) → dynamic
+  function throwAbstractClassInstantiationError(className) {
+    throw new core.AbstractClassInstantiationError(className);
+  }
+  class TypeErrorDecoder extends dart.Object {
+    TypeErrorDecoder(_arguments, _argumentsExpr, _expr, _method, _receiver, _pattern) {
+      this._arguments = _arguments;
+      this._argumentsExpr = _argumentsExpr;
+      this._expr = _expr;
+      this._method = _method;
+      this._receiver = _receiver;
+      this._pattern = _pattern;
+    }
+    matchTypeError(message) {
+      let match = _foreign_helper.JS('JSExtendableArray|Null', 'new RegExp(#).exec(#)', this._pattern, message);
+      if (match === null)
+        return null;
+      let result = _foreign_helper.JS('', 'Object.create(null)');
+      if (this._arguments !== -1) {
+        _foreign_helper.JS('', '#.arguments = #[# + 1]', result, match, this._arguments);
+      }
+      if (this._argumentsExpr !== -1) {
+        _foreign_helper.JS('', '#.argumentsExpr = #[# + 1]', result, match, this._argumentsExpr);
+      }
+      if (this._expr !== -1) {
+        _foreign_helper.JS('', '#.expr = #[# + 1]', result, match, this._expr);
+      }
+      if (this._method !== -1) {
+        _foreign_helper.JS('', '#.method = #[# + 1]', result, match, this._method);
+      }
+      if (this._receiver !== -1) {
+        _foreign_helper.JS('', '#.receiver = #[# + 1]', result, match, this._receiver);
+      }
+      return result;
+    }
+    static buildJavaScriptObject() {
+      return _foreign_helper.JS('', '{ toString: function() { return "$receiver$"; } }');
+    }
+    static buildJavaScriptObjectWithNonClosure() {
+      return _foreign_helper.JS('', '{ $method$: null, ' + 'toString: function() { return "$receiver$"; } }');
+    }
+    static extractPattern(message) {
+      message = dart.as(_foreign_helper.JS('String', "#.replace(String({}), '$receiver$')", message), core.String);
+      message = dart.as(_foreign_helper.JS('String', "#.replace(new RegExp(#, 'g'), '\\\\$&')", message, ESCAPE_REGEXP), core.String);
+      let match = dart.as(_foreign_helper.JS('JSExtendableArray|Null', "#.match(/\\\\\\$[a-zA-Z]+\\\\\\$/g)", message), core.List$(core.String));
+      if (match === null)
+        match = dart.as(new List.from([]), core.List$(core.String));
+      let arguments = dart.as(_foreign_helper.JS('int', '#.indexOf(#)', match, '\\$arguments\\$'), core.int);
+      let argumentsExpr = dart.as(_foreign_helper.JS('int', '#.indexOf(#)', match, '\\$argumentsExpr\\$'), core.int);
+      let expr = dart.as(_foreign_helper.JS('int', '#.indexOf(#)', match, '\\$expr\\$'), core.int);
+      let method = dart.as(_foreign_helper.JS('int', '#.indexOf(#)', match, '\\$method\\$'), core.int);
+      let receiver = dart.as(_foreign_helper.JS('int', '#.indexOf(#)', match, '\\$receiver\\$'), core.int);
+      let pattern = dart.as(_foreign_helper.JS('String', "#.replace('\\\\$arguments\\\\$', '((?:x|[^x])*)')" + ".replace('\\\\$argumentsExpr\\\\$',  '((?:x|[^x])*)')" + ".replace('\\\\$expr\\\\$',  '((?:x|[^x])*)')" + ".replace('\\\\$method\\\\$',  '((?:x|[^x])*)')" + ".replace('\\\\$receiver\\\\$',  '((?:x|[^x])*)')", message), core.String);
+      return new TypeErrorDecoder(arguments, argumentsExpr, expr, method, receiver, pattern);
+    }
+    static provokeCallErrorOn(expression) {
+      let function = _foreign_helper.JS('', "function($expr$) {\n  var $argumentsExpr$ = '$arguments$';\n  try {\n    $expr$.$method$($argumentsExpr$);\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)(#)', function, expression), core.String);
+    }
+    static provokeCallErrorOnNull() {
+      let function = _foreign_helper.JS('', "function() {\n  var $argumentsExpr$ = '$arguments$';\n  try {\n    null.$method$($argumentsExpr$);\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)()', function), core.String);
+    }
+    static provokeCallErrorOnUndefined() {
+      let function = _foreign_helper.JS('', "function() {\n  var $argumentsExpr$ = '$arguments$';\n  try {\n    (void 0).$method$($argumentsExpr$);\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)()', function), core.String);
+    }
+    static provokePropertyErrorOn(expression) {
+      let function = _foreign_helper.JS('', "function($expr$) {\n  try {\n    $expr$.$method$;\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)(#)', function, expression), core.String);
+    }
+    static provokePropertyErrorOnNull() {
+      let function = _foreign_helper.JS('', "function() {\n  try {\n    null.$method$;\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)()', function), core.String);
+    }
+    static provokePropertyErrorOnUndefined() {
+      let function = _foreign_helper.JS('', "function() {\n  try {\n    (void 0).$method$;\n  } catch (e) {\n    return e.message;\n  }\n}");
+      return dart.as(_foreign_helper.JS('String', '(#)()', function), core.String);
+    }
+  }
+  dart.defineLazyProperties(TypeErrorDecoder, {
+    get noSuchMethodPattern() {
+      return dart.as(extractPattern(provokeCallErrorOn(buildJavaScriptObject())), TypeErrorDecoder);
+    },
+    get notClosurePattern() {
+      return dart.as(extractPattern(provokeCallErrorOn(buildJavaScriptObjectWithNonClosure())), TypeErrorDecoder);
+    },
+    get nullCallPattern() {
+      return dart.as(extractPattern(provokeCallErrorOn(_foreign_helper.JS('', 'null'))), TypeErrorDecoder);
+    },
+    get nullLiteralCallPattern() {
+      return dart.as(extractPattern(provokeCallErrorOnNull()), TypeErrorDecoder);
+    },
+    get undefinedCallPattern() {
+      return dart.as(extractPattern(provokeCallErrorOn(_foreign_helper.JS('', 'void 0'))), TypeErrorDecoder);
+    },
+    get undefinedLiteralCallPattern() {
+      return dart.as(extractPattern(provokeCallErrorOnUndefined()), TypeErrorDecoder);
+    },
+    get nullPropertyPattern() {
+      return dart.as(extractPattern(provokePropertyErrorOn(_foreign_helper.JS('', 'null'))), TypeErrorDecoder);
+    },
+    get nullLiteralPropertyPattern() {
+      return dart.as(extractPattern(provokePropertyErrorOnNull()), TypeErrorDecoder);
+    },
+    get undefinedPropertyPattern() {
+      return dart.as(extractPattern(provokePropertyErrorOn(_foreign_helper.JS('', 'void 0'))), TypeErrorDecoder);
+    },
+    get undefinedLiteralPropertyPattern() {
+      return dart.as(extractPattern(provokePropertyErrorOnUndefined()), TypeErrorDecoder);
+    }
+  });
+  class NullError extends core.Error {
+    NullError(_message, match) {
+      this._message = _message;
+      this._method = match === null ? null : _foreign_helper.JS('', '#.method', match);
+      super.Error();
+    }
+    toString() {
+      if (this._method === null)
+        return `NullError: ${this._message}`;
+      return `NullError: Cannot call "${this._method}" on null`;
+    }
+  }
+  class JsNoSuchMethodError extends core.Error {
+    JsNoSuchMethodError(_message, match) {
+      this._message = _message;
+      this._method = match === null ? null : _foreign_helper.JS('String|Null', '#.method', match);
+      this._receiver = match === null ? null : _foreign_helper.JS('String|Null', '#.receiver', match);
+      super.Error();
+    }
+    toString() {
+      if (this._method === null)
+        return `NoSuchMethodError: ${this._message}`;
+      if (this._receiver === null) {
+        return `NoSuchMethodError: Cannot call "${this._method}" (${this._message})`;
+      }
+      return `NoSuchMethodError: Cannot call "${this._method}" on "${this._receiver}" ` + `(${this._message})`;
+    }
+  }
+  class UnknownJsTypeError extends core.Error {
+    UnknownJsTypeError(_message) {
+      this._message = _message;
+      super.Error();
+    }
+    toString() {
+      return this._message.isEmpty ? 'Error' : `Error: ${this._message}`;
+    }
+  }
+  // Function unwrapException: (dynamic) → dynamic
+  function unwrapException(ex) {
+    // Function saveStackTrace: (dynamic) → dynamic
+    function saveStackTrace(error) {
+      if (dart.is(error, core.Error)) {
+        let thrownStackTrace = _foreign_helper.JS('', '#.$thrownJsError', error);
+        if (thrownStackTrace === null) {
+          _foreign_helper.JS('void', '#.$thrownJsError = #', error, ex);
+        }
+      }
+      return error;
+    }
+    if (ex === null)
+      return null;
+    if (_foreign_helper.JS('bool', 'typeof # !== "object"', ex))
+      return ex;
+    if (_foreign_helper.JS('bool', '"dartException" in #', ex)) {
+      return saveStackTrace(_foreign_helper.JS('', '#.dartException', ex));
+    } else if (dart.throw_("Unimplemented PrefixExpression: !JS('bool', r'\"message\" in #', ex)")) {
+      return ex;
+    }
+    let message = _foreign_helper.JS('var', '#.message', ex);
+    if (dart.dbinary(_foreign_helper.JS('bool', '"number" in #', ex), '&&', _foreign_helper.JS('bool', 'typeof #.number == "number"', ex))) {
+      let number = dart.as(_foreign_helper.JS('int', '#.number', ex), core.int);
+      let ieErrorCode = number & 65535;
+      let ieFacilityNumber = number >> 16 & 8191;
+      if (ieFacilityNumber === 10) {
+        switch (ieErrorCode) {
+          case 438:
+            return saveStackTrace(new JsNoSuchMethodError(`${message} (Error ${ieErrorCode})`, null));
+          case 445:
+          case 5007:
+            return saveStackTrace(new NullError(`${message} (Error ${ieErrorCode})`, null));
+        }
+      }
+    }
+    if (_foreign_helper.JS('bool', '# instanceof TypeError', ex)) {
+      let match = null;
+      let nsme = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.noSuchMethodPattern);
+      let notClosure = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.notClosurePattern);
+      let nullCall = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.nullCallPattern);
+      let nullLiteralCall = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.nullLiteralCallPattern);
+      let undefCall = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.undefinedCallPattern);
+      let undefLiteralCall = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.undefinedLiteralCallPattern);
+      let nullProperty = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.nullPropertyPattern);
+      let nullLiteralProperty = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.nullLiteralPropertyPattern);
+      let undefProperty = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.undefinedPropertyPattern);
+      let undefLiteralProperty = _foreign_helper.JS('TypeErrorDecoder', '#', TypeErrorDecoder.undefinedLiteralPropertyPattern);
+      if ((match = dart.dinvoke(nsme, 'matchTypeError', message)) !== null) {
+        return saveStackTrace(new JsNoSuchMethodError(message, match));
+      } else if ((match = dart.dinvoke(notClosure, 'matchTypeError', message)) !== null) {
+        _foreign_helper.JS('', '#.method = "call"', match);
+        return saveStackTrace(new JsNoSuchMethodError(message, match));
+      } else if (dart.notNull(dart.notNull(dart.notNull(dart.notNull(dart.notNull(dart.notNull(dart.notNull((match = dart.dinvoke(nullCall, 'matchTypeError', message)) !== null) || dart.notNull((match = dart.dinvoke(nullLiteralCall, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(undefCall, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(undefLiteralCall, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(nullProperty, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(nullLiteralCall, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(undefProperty, 'matchTypeError', message)) !== null)) || dart.notNull((match = dart.dinvoke(undefLiteralProperty, 'matchTypeError', message)) !== null)) {
+        return saveStackTrace(new NullError(message, match));
+      }
+      return saveStackTrace(new UnknownJsTypeError(typeof message == string ? message : ''));
+    }
+    if (_foreign_helper.JS('bool', '# instanceof RangeError', ex)) {
+      if (dart.notNull(typeof message == string) && dart.notNull(contains(dart.as(message, core.String), 'call stack'))) {
+        return new core.StackOverflowError();
+      }
+      return saveStackTrace(new core.ArgumentError());
+    }
+    if (_foreign_helper.JS('bool', 'typeof InternalError == "function" && # instanceof InternalError', ex)) {
+      if (dart.notNull(typeof message == string) && dart.notNull(dart.equals(message, 'too much recursion'))) {
+        return new core.StackOverflowError();
+      }
+    }
+    return ex;
+  }
+  // Function getTraceFromException: (dynamic) → StackTrace
+  function getTraceFromException(exception) {
+    return new _StackTrace(exception);
+  }
+  class _StackTrace extends dart.Object {
+    _StackTrace(_exception) {
+      this._exception = _exception;
+      this._trace = null;
+    }
+    toString() {
+      if (this._trace !== null)
+        return this._trace;
+      let trace = null;
+      if (_foreign_helper.JS('bool', 'typeof # === "object"', this._exception)) {
+        trace = dart.as(_foreign_helper.JS("String|Null", "#.stack", this._exception), core.String);
+      }
+      return this._trace = trace === null ? '' : trace;
+    }
+  }
+  // Function objectHashCode: (dynamic) → int
+  function objectHashCode(object) {
+    if (core.bool['||'](object === null, _foreign_helper.JS('bool', "typeof # != 'object'", object))) {
+      return dart.as(dart.dload(object, 'hashCode'), core.int);
+    } else {
+      return Primitives.objectHashCode(object);
+    }
+  }
+  // Function fillLiteralMap: (dynamic, Map<dynamic, dynamic>) → dynamic
+  function fillLiteralMap(keyValuePairs, result) {
+    let index = 0;
+    let length = getLength(keyValuePairs);
+    while (index < length) {
+      let key = getIndex(keyValuePairs, index++);
+      let value = getIndex(keyValuePairs, index++);
+      result.set(key, value);
+    }
+    return result;
+  }
+  // Function invokeClosure: (Function, dynamic, int, dynamic, dynamic, dynamic, dynamic) → dynamic
+  function invokeClosure(closure, isolate, numberOfArguments, arg1, arg2, arg3, arg4) {
+    if (numberOfArguments === 0) {
+      return _foreign_helper.JS_CALL_IN_ISOLATE(isolate, () => dart.dinvokef(closure));
+    } else if (numberOfArguments === 1) {
+      return _foreign_helper.JS_CALL_IN_ISOLATE(isolate, () => dart.dinvokef(closure, arg1));
+    } else if (numberOfArguments === 2) {
+      return _foreign_helper.JS_CALL_IN_ISOLATE(isolate, () => dart.dinvokef(closure, arg1, arg2));
+    } else if (numberOfArguments === 3) {
+      return _foreign_helper.JS_CALL_IN_ISOLATE(isolate, () => dart.dinvokef(closure, arg1, arg2, arg3));
+    } else if (numberOfArguments === 4) {
+      return _foreign_helper.JS_CALL_IN_ISOLATE(isolate, () => dart.dinvokef(closure, arg1, arg2, arg3, arg4));
+    } else {
+      throw new core.Exception('Unsupported number of arguments for wrapped closure');
+    }
+  }
+  // Function convertDartClosureToJS: (dynamic, int) → dynamic
+  function convertDartClosureToJS(closure, arity) {
+    if (closure === null)
+      return null;
+    let function = _foreign_helper.JS('var', '#.$identity', closure);
+    if (_foreign_helper.JS('bool', '!!#', function))
+      return function;
+    function = _foreign_helper.JS('var', '(function(closure, arity, context, invoke) {' + '  return function(a1, a2, a3, a4) {' + '     return invoke(closure, context, arity, a1, a2, a3, a4);' + '  };' + '})(#,#,#,#)', closure, arity, _foreign_helper.JS_CURRENT_ISOLATE_CONTEXT(), _foreign_helper.DART_CLOSURE_TO_JS(invokeClosure));
+    _foreign_helper.JS('void', '#.$identity = #', closure, function);
+    return function;
+  }
+  class Closure extends dart.Object {
+    Closure() {
+    }
+    static fromTearOff(receiver, functions, reflectionInfo, isStatic, jsArguments, propertyName) {
+      _foreign_helper.JS_EFFECT(() => {
+        BoundClosure.receiverOf(dart.as(_foreign_helper.JS('BoundClosure', 'void 0'), BoundClosure));
+        BoundClosure.selfOf(dart.as(_foreign_helper.JS('BoundClosure', 'void 0'), BoundClosure));
+      });
+      let function = _foreign_helper.JS('', '#[#]', functions, 0);
+      let name = dart.as(_foreign_helper.JS('String|Null', '#.$stubName', function), core.String);
+      let callName = dart.as(_foreign_helper.JS('String|Null', '#.$callName', function), core.String);
+      _foreign_helper.JS('', '#.$reflectionInfo = #', function, reflectionInfo);
+      let info = new ReflectionInfo(function);
+      let functionType = info.functionType;
+      let prototype = isStatic ? _foreign_helper.JS('TearOffClosure', 'Object.create(#.constructor.prototype)', new TearOffClosure()) : _foreign_helper.JS('BoundClosure', 'Object.create(#.constructor.prototype)', new BoundClosure(null, null, null, null));
+      _foreign_helper.JS('', '#.$initialize = #', prototype, _foreign_helper.JS('', '#.constructor', prototype));
+      let constructor = isStatic ? _foreign_helper.JS('', 'function(){this.$initialize()}') : isCsp ? _foreign_helper.JS('', 'function(a,b,c,d) {this.$initialize(a,b,c,d)}') : _foreign_helper.JS('', 'new Function("a","b","c","d",' + '"this.$initialize(a,b,c,d);"+#)', functionCounter++);
+      _foreign_helper.JS('', '#.constructor = #', prototype, constructor);
+      _foreign_helper.JS('', '#.prototype = #', constructor, prototype);
+      let trampoline = function;
+      let isIntercepted = false;
+      if (!dart.notNull(isStatic)) {
+        if (_foreign_helper.JS('bool', '#.length == 1', jsArguments)) {
+          isIntercepted = true;
+        }
+        trampoline = forwardCallTo(receiver, function, isIntercepted);
+        _foreign_helper.JS('', '#.$reflectionInfo = #', trampoline, reflectionInfo);
+      } else {
+        _foreign_helper.JS('', '#.$name = #', prototype, propertyName);
+      }
+      let signatureFunction = null;
+      if (_foreign_helper.JS('bool', 'typeof # == "number"', functionType)) {
+        let metadata = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.METADATA, core.String));
+        signatureFunction = _foreign_helper.JS('', '(function(s){return function(){return #[s]}})(#)', metadata, functionType);
+      } else if (core.bool['&&'](!dart.notNull(isStatic), _foreign_helper.JS('bool', 'typeof # == "function"', functionType))) {
+        let getReceiver = isIntercepted ? _foreign_helper.RAW_DART_FUNCTION_REF(BoundClosure.receiverOf) : _foreign_helper.RAW_DART_FUNCTION_REF(BoundClosure.selfOf);
+        signatureFunction = _foreign_helper.JS('', 'function(f,r){' + 'return function(){' + 'return f.apply({$receiver:r(this)},arguments)' + '}' + '}(#,#)', functionType, getReceiver);
+      } else {
+        throw 'Error in reflectionInfo.';
+      }
+      _foreign_helper.JS('', '#[#] = #', prototype, _foreign_helper.JS_SIGNATURE_NAME(), signatureFunction);
+      _foreign_helper.JS('', '#[#] = #', prototype, callName, trampoline);
+      for (let i = 1; i < functions.length; i++) {
+        let stub = functions.get(i);
+        let stubCallName = _foreign_helper.JS('String|Null', '#.$callName', stub);
+        if (stubCallName !== null) {
+          _foreign_helper.JS('', '#[#] = #', prototype, stubCallName, isStatic ? stub : forwardCallTo(receiver, stub, isIntercepted));
+        }
+      }
+      _foreign_helper.JS('', '#["call*"] = #', prototype, trampoline);
+      return constructor;
+    }
+    static cspForwardCall(arity, isSuperCall, stubName, function) {
+      let getSelf = _foreign_helper.RAW_DART_FUNCTION_REF(BoundClosure.selfOf);
+      if (isSuperCall)
+        arity = -1;
+      switch (arity) {
+        case 0:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(){' + 'return S(this)[n]()' + '}' + '}(#,#)', stubName, getSelf);
+        case 1:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(a){' + 'return S(this)[n](a)' + '}' + '}(#,#)', stubName, getSelf);
+        case 2:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(a,b){' + 'return S(this)[n](a,b)' + '}' + '}(#,#)', stubName, getSelf);
+        case 3:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(a,b,c){' + 'return S(this)[n](a,b,c)' + '}' + '}(#,#)', stubName, getSelf);
+        case 4:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(a,b,c,d){' + 'return S(this)[n](a,b,c,d)' + '}' + '}(#,#)', stubName, getSelf);
+        case 5:
+          return _foreign_helper.JS('', 'function(n,S){' + 'return function(a,b,c,d,e){' + 'return S(this)[n](a,b,c,d,e)' + '}' + '}(#,#)', stubName, getSelf);
+        default:
+          return _foreign_helper.JS('', 'function(f,s){' + 'return function(){' + 'return f.apply(s(this),arguments)' + '}' + '}(#,#)', function, getSelf);
+      }
+    }
+    static get isCsp() {
+      return dart.as(_foreign_helper.JS('bool', 'typeof dart_precompiled == "function"'), core.bool);
+    }
+    static forwardCallTo(receiver, function, isIntercepted) {
+      if (isIntercepted)
+        return forwardInterceptedCallTo(receiver, function);
+      let stubName = dart.as(_foreign_helper.JS('String|Null', '#.$stubName', function), core.String);
+      let arity = dart.as(_foreign_helper.JS('int', '#.length', function), core.int);
+      let lookedUpFunction = _foreign_helper.JS("", "#[#]", receiver, stubName);
+      let isSuperCall = !dart.notNull(core.identical(function, lookedUpFunction));
+      if (dart.notNull(dart.notNull(isCsp) || dart.notNull(isSuperCall)) || dart.notNull(arity >= 27)) {
+        return cspForwardCall(arity, isSuperCall, stubName, function);
+      }
+      if (arity === 0) {
+        return _foreign_helper.JS('', '(new Function(#))()', 'return function(){' + `return this.${BoundClosure.selfFieldName()}.${stubName}();` + `${functionCounter++}` + '}');
+      }
+      dart.assert(dart.notNull(1 <= arity) && dart.notNull(arity < 27));
+      let arguments = dart.as(_foreign_helper.JS('String', '"abcdefghijklmnopqrstuvwxyz".split("").splice(0,#).join(",")', arity), core.String);
+      return _foreign_helper.JS('', '(new Function(#))()', `return function(${arguments}){` + `return this.${BoundClosure.selfFieldName()}.${stubName}(${arguments});` + `${functionCounter++}` + '}');
+    }
+    static cspForwardInterceptedCall(arity, isSuperCall, name, function) {
+      let getSelf = _foreign_helper.RAW_DART_FUNCTION_REF(BoundClosure.selfOf);
+      let getReceiver = _foreign_helper.RAW_DART_FUNCTION_REF(BoundClosure.receiverOf);
+      if (isSuperCall)
+        arity = -1;
+      switch (arity) {
+        case 0:
+          throw new RuntimeError('Intercepted function with no arguments.');
+        case 1:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(){' + 'return s(this)[n](r(this))' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        case 2:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(a){' + 'return s(this)[n](r(this),a)' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        case 3:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(a,b){' + 'return s(this)[n](r(this),a,b)' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        case 4:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(a,b,c){' + 'return s(this)[n](r(this),a,b,c)' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        case 5:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(a,b,c,d){' + 'return s(this)[n](r(this),a,b,c,d)' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        case 6:
+          return _foreign_helper.JS('', 'function(n,s,r){' + 'return function(a,b,c,d,e){' + 'return s(this)[n](r(this),a,b,c,d,e)' + '}' + '}(#,#,#)', name, getSelf, getReceiver);
+        default:
+          return _foreign_helper.JS('', 'function(f,s,r,a){' + 'return function(){' + 'a=[r(this)];' + 'Array.prototype.push.apply(a,arguments);' + 'return f.apply(s(this),a)' + '}' + '}(#,#,#)', function, getSelf, getReceiver);
+      }
+    }
+    static forwardInterceptedCallTo(receiver, function) {
+      let selfField = BoundClosure.selfFieldName();
+      let receiverField = BoundClosure.receiverFieldName();
+      let stubName = dart.as(_foreign_helper.JS('String|Null', '#.$stubName', function), core.String);
+      let arity = dart.as(_foreign_helper.JS('int', '#.length', function), core.int);
+      let isCsp = dart.as(_foreign_helper.JS('bool', 'typeof dart_precompiled == "function"'), core.bool);
+      let lookedUpFunction = _foreign_helper.JS("", "#[#]", receiver, stubName);
+      let isSuperCall = !dart.notNull(core.identical(function, lookedUpFunction));
+      if (dart.notNull(dart.notNull(isCsp) || dart.notNull(isSuperCall)) || dart.notNull(arity >= 28)) {
+        return cspForwardInterceptedCall(arity, isSuperCall, stubName, function);
+      }
+      if (arity === 1) {
+        return _foreign_helper.JS('', '(new Function(#))()', 'return function(){' + `return this.${selfField}.${stubName}(this.${receiverField});` + `${functionCounter++}` + '}');
+      }
+      dart.assert(dart.notNull(1 < arity) && dart.notNull(arity < 28));
+      let arguments = dart.as(_foreign_helper.JS('String', '"abcdefghijklmnopqrstuvwxyz".split("").splice(0,#).join(",")', arity - 1), core.String);
+      return _foreign_helper.JS('', '(new Function(#))()', `return function(${arguments}){` + `return this.${selfField}.${stubName}(this.${receiverField}, ${arguments});` + `${functionCounter++}` + '}');
+    }
+    toString() {
+      return "Closure";
+    }
+  }
+  Closure.FUNCTION_INDEX = 0;
+  Closure.NAME_INDEX = 1;
+  Closure.CALL_NAME_INDEX = 2;
+  Closure.REQUIRED_PARAMETER_INDEX = 3;
+  Closure.OPTIONAL_PARAMETER_INDEX = 4;
+  Closure.DEFAULT_ARGUMENTS_INDEX = 5;
+  Closure.functionCounter = 0;
+  // Function closureFromTearOff: (dynamic, dynamic, dynamic, dynamic, dynamic, dynamic) → dynamic
+  function closureFromTearOff(receiver, functions, reflectionInfo, isStatic, jsArguments, name) {
+    return Closure.fromTearOff(receiver, _interceptors.JSArray.markFixedList(dart.as(functions, core.List)), _interceptors.JSArray.markFixedList(dart.as(reflectionInfo, core.List)), dart.as(_foreign_helper.JS('bool', '!!#', isStatic), core.bool), jsArguments, dart.as(_foreign_helper.JS('String', '#', name), core.String));
+  }
+  class TearOffClosure extends Closure {
+  }
+  class BoundClosure extends TearOffClosure {
+    BoundClosure(_self, _target, _receiver, _name) {
+      this._self = _self;
+      this._target = _target;
+      this._receiver = _receiver;
+      this._name = _name;
+      super.TearOffClosure();
+    }
+    ['=='](other) {
+      if (core.identical(this, other))
+        return true;
+      if (!dart.is(other, BoundClosure))
+        return false;
+      return dart.as(_foreign_helper.JS('bool', '# === # && # === # && # === #', this._self, dart.dload(other, '_self'), this._target, dart.dload(other, '_target'), this._receiver, dart.dload(other, '_receiver')), core.bool);
+    }
+    get hashCode() {
+      let receiverHashCode = null;
+      if (this._receiver === null) {
+        receiverHashCode = Primitives.objectHashCode(this._self);
+      } else if (!dart.equals(_foreign_helper.JS('String', 'typeof #', this._receiver), 'object')) {
+        receiverHashCode = dart.as(dart.dload(this._receiver, 'hashCode'), core.int);
+      } else {
+        receiverHashCode = Primitives.objectHashCode(this._receiver);
+      }
+      return receiverHashCode ^ Primitives.objectHashCode(this._target);
+    }
+    static selfOf(closure) {
+      return closure._self;
+    }
+    static targetOf(closure) {
+      return closure._target;
+    }
+    static receiverOf(closure) {
+      return closure._receiver;
+    }
+    static nameOf(closure) {
+      return closure._name;
+    }
+    static selfFieldName() {
+      if (selfFieldNameCache === null) {
+        selfFieldNameCache = computeFieldNamed('self');
+      }
+      return selfFieldNameCache;
+    }
+    static receiverFieldName() {
+      if (receiverFieldNameCache === null) {
+        receiverFieldNameCache = computeFieldNamed('receiver');
+      }
+      return receiverFieldNameCache;
+    }
+    static computeFieldNamed(fieldName) {
+      let template = new BoundClosure('self', 'target', 'receiver', 'name');
+      let names = _interceptors.JSArray.markFixedList(dart.as(_foreign_helper.JS('', 'Object.getOwnPropertyNames(#)', template), core.List));
+      for (let i = 0; i < names.length; i++) {
+        let name = names.get(i);
+        if (_foreign_helper.JS('bool', '#[#] === #', template, name, fieldName)) {
+          return dart.as(_foreign_helper.JS('String', '#', name), core.String);
+        }
+      }
+    }
+  }
+  BoundClosure.selfFieldNameCache = null;
+  BoundClosure.receiverFieldNameCache = null;
+  // Function jsHasOwnProperty: (dynamic, String) → bool
+  function jsHasOwnProperty(jsObject, property) {
+    return dart.as(_foreign_helper.JS('bool', '#.hasOwnProperty(#)', jsObject, property), core.bool);
+  }
+  // Function jsPropertyAccess: (dynamic, String) → dynamic
+  function jsPropertyAccess(jsObject, property) {
+    return _foreign_helper.JS('var', '#[#]', jsObject, property);
+  }
+  // Function getFallThroughError: () → dynamic
+  function getFallThroughError() {
+    return new FallThroughErrorImplementation();
+  }
+  class Creates extends dart.Object {
+    Creates(types) {
+      this.types = types;
+    }
+  }
+  class Returns extends dart.Object {
+    Returns(types) {
+      this.types = types;
+    }
+  }
+  class JSName extends dart.Object {
+    JSName(name) {
+      this.name = name;
+    }
+  }
+  // Function boolConversionCheck: (dynamic) → dynamic
+  function boolConversionCheck(value) {
+    if (typeof value == boolean)
+      return value;
+    boolTypeCheck(value);
+    dart.assert(value !== null);
+    return false;
+  }
+  // Function stringTypeCheck: (dynamic) → dynamic
+  function stringTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    throw new TypeErrorImplementation(value, 'String');
+  }
+  // Function stringTypeCast: (dynamic) → dynamic
+  function stringTypeCast(value) {
+    if (dart.notNull(typeof value == string) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'String');
+  }
+  // Function doubleTypeCheck: (dynamic) → dynamic
+  function doubleTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (typeof value == number)
+      return value;
+    throw new TypeErrorImplementation(value, 'double');
+  }
+  // Function doubleTypeCast: (dynamic) → dynamic
+  function doubleTypeCast(value) {
+    if (dart.notNull(typeof value == number) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'double');
+  }
+  // Function numTypeCheck: (dynamic) → dynamic
+  function numTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (dart.is(value, core.num))
+      return value;
+    throw new TypeErrorImplementation(value, 'num');
+  }
+  // Function numTypeCast: (dynamic) → dynamic
+  function numTypeCast(value) {
+    if (dart.notNull(dart.is(value, core.num)) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'num');
+  }
+  // Function boolTypeCheck: (dynamic) → dynamic
+  function boolTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (typeof value == boolean)
+      return value;
+    throw new TypeErrorImplementation(value, 'bool');
+  }
+  // Function boolTypeCast: (dynamic) → dynamic
+  function boolTypeCast(value) {
+    if (dart.notNull(typeof value == boolean) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'bool');
+  }
+  // Function intTypeCheck: (dynamic) → dynamic
+  function intTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (typeof value == number)
+      return value;
+    throw new TypeErrorImplementation(value, 'int');
+  }
+  // Function intTypeCast: (dynamic) → dynamic
+  function intTypeCast(value) {
+    if (dart.notNull(typeof value == number) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'int');
+  }
+  // Function propertyTypeError: (dynamic, dynamic) → void
+  function propertyTypeError(value, property) {
+    let name = dart.as(dart.dinvoke(property, 'substring', 3, dart.dload(property, 'length')), core.String);
+    throw new TypeErrorImplementation(value, name);
+  }
+  // Function propertyTypeCastError: (dynamic, dynamic) → void
+  function propertyTypeCastError(value, property) {
+    let actualType = Primitives.objectTypeName(value);
+    let expectedType = dart.as(dart.dinvoke(property, 'substring', 3, dart.dload(property, 'length')), core.String);
+    throw new CastErrorImplementation(actualType, expectedType);
+  }
+  // Function propertyTypeCheck: (dynamic, dynamic) → dynamic
+  function propertyTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (_foreign_helper.JS('bool', '!!#[#]', value, property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function propertyTypeCast: (dynamic, dynamic) → dynamic
+  function propertyTypeCast(value, property) {
+    if (core.bool['||'](value === null, _foreign_helper.JS('bool', '!!#[#]', value, property)))
+      return value;
+    propertyTypeCastError(value, property);
+  }
+  // Function interceptedTypeCheck: (dynamic, dynamic) → dynamic
+  function interceptedTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (core.bool['&&'](core.identical(_foreign_helper.JS('String', 'typeof #', value), 'object'), _foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))) {
+      return value;
+    }
+    propertyTypeError(value, property);
+  }
+  // Function interceptedTypeCast: (dynamic, dynamic) → dynamic
+  function interceptedTypeCast(value, property) {
+    if (dart.notNull(value === null) || dart.notNull(dart.dbinary(_foreign_helper.JS('bool', 'typeof # === "object"', value), '&&', _foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property)))) {
+      return value;
+    }
+    propertyTypeCastError(value, property);
+  }
+  // Function numberOrStringSuperTypeCheck: (dynamic, dynamic) → dynamic
+  function numberOrStringSuperTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    if (dart.is(value, core.num))
+      return value;
+    if (_foreign_helper.JS('bool', '!!#[#]', value, property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function numberOrStringSuperTypeCast: (dynamic, dynamic) → dynamic
+  function numberOrStringSuperTypeCast(value, property) {
+    if (typeof value == string)
+      return value;
+    if (dart.is(value, core.num))
+      return value;
+    return propertyTypeCast(value, property);
+  }
+  // Function numberOrStringSuperNativeTypeCheck: (dynamic, dynamic) → dynamic
+  function numberOrStringSuperNativeTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    if (dart.is(value, core.num))
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function numberOrStringSuperNativeTypeCast: (dynamic, dynamic) → dynamic
+  function numberOrStringSuperNativeTypeCast(value, property) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    if (dart.is(value, core.num))
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeCastError(value, property);
+  }
+  // Function stringSuperTypeCheck: (dynamic, dynamic) → dynamic
+  function stringSuperTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    if (_foreign_helper.JS('bool', '!!#[#]', value, property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function stringSuperTypeCast: (dynamic, dynamic) → dynamic
+  function stringSuperTypeCast(value, property) {
+    if (typeof value == string)
+      return value;
+    return propertyTypeCast(value, property);
+  }
+  // Function stringSuperNativeTypeCheck: (dynamic, dynamic) → dynamic
+  function stringSuperNativeTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (typeof value == string)
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function stringSuperNativeTypeCast: (dynamic, dynamic) → dynamic
+  function stringSuperNativeTypeCast(value, property) {
+    if (dart.notNull(typeof value == string) || dart.notNull(value === null))
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeCastError(value, property);
+  }
+  // Function listTypeCheck: (dynamic) → dynamic
+  function listTypeCheck(value) {
+    if (value === null)
+      return value;
+    if (dart.is(value, core.List))
+      return value;
+    throw new TypeErrorImplementation(value, 'List');
+  }
+  // Function listTypeCast: (dynamic) → dynamic
+  function listTypeCast(value) {
+    if (dart.notNull(dart.is(value, core.List)) || dart.notNull(value === null))
+      return value;
+    throw new CastErrorImplementation(Primitives.objectTypeName(value), 'List');
+  }
+  // Function listSuperTypeCheck: (dynamic, dynamic) → dynamic
+  function listSuperTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (dart.is(value, core.List))
+      return value;
+    if (_foreign_helper.JS('bool', '!!#[#]', value, property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function listSuperTypeCast: (dynamic, dynamic) → dynamic
+  function listSuperTypeCast(value, property) {
+    if (dart.is(value, core.List))
+      return value;
+    return propertyTypeCast(value, property);
+  }
+  // Function listSuperNativeTypeCheck: (dynamic, dynamic) → dynamic
+  function listSuperNativeTypeCheck(value, property) {
+    if (value === null)
+      return value;
+    if (dart.is(value, core.List))
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeError(value, property);
+  }
+  // Function listSuperNativeTypeCast: (dynamic, dynamic) → dynamic
+  function listSuperNativeTypeCast(value, property) {
+    if (dart.notNull(dart.is(value, core.List)) || dart.notNull(value === null))
+      return value;
+    if (_foreign_helper.JS('bool', '#[#]', _interceptors.getInterceptor(value), property))
+      return value;
+    propertyTypeCastError(value, property);
+  }
+  // Function voidTypeCheck: (dynamic) → dynamic
+  function voidTypeCheck(value) {
+    if (value === null)
+      return value;
+    throw new TypeErrorImplementation(value, 'void');
+  }
+  // Function checkMalformedType: (dynamic, dynamic) → dynamic
+  function checkMalformedType(value, message) {
+    if (value === null)
+      return value;
+    throw new TypeErrorImplementation.fromMessage(message);
+  }
+  // Function checkDeferredIsLoaded: (String, String) → void
+  function checkDeferredIsLoaded(loadId, uri) {
+    if (!dart.notNull(_js_helper._loadedLibraries.contains(loadId))) {
+      throw new DeferredNotLoadedError(uri);
+    }
+  }
+  class JavaScriptIndexingBehavior extends _interceptors.JSMutableIndexable {
+  }
+  class TypeErrorImplementation extends core.Error {
+    TypeErrorImplementation(value, type) {
+      this.message = `type '${Primitives.objectTypeName(value)}' is not a subtype ` + `of type '${type}'`;
+      super.Error();
+    }
+    TypeErrorImplementation$fromMessage(message) {
+      this.message = message;
+      super.Error();
+    }
+    toString() {
+      return this.message;
+    }
+  }
+  dart.defineNamedConstructor(TypeErrorImplementation, 'fromMessage');
+  class CastErrorImplementation extends core.Error {
+    CastErrorImplementation(actualType, expectedType) {
+      this.message = `CastError: Casting value of type ${actualType} to` + ` incompatible type ${expectedType}`;
+      super.Error();
+    }
+    toString() {
+      return this.message;
+    }
+  }
+  class FallThroughErrorImplementation extends core.FallThroughError {
+    FallThroughErrorImplementation() {
+      super.FallThroughError();
+    }
+    toString() {
+      return "Switch case fall-through.";
+    }
+  }
+  // Function assertHelper: (dynamic) → void
+  function assertHelper(condition) {
+    if (!(typeof condition == boolean)) {
+      if (dart.is(condition, core.Function))
+        condition = dart.dinvokef(condition);
+      if (!(typeof condition == boolean)) {
+        throw new TypeErrorImplementation(condition, 'bool');
+      }
+    }
+    if (true !== condition)
+      throw new core.AssertionError();
+  }
+  // Function throwNoSuchMethod: (dynamic, dynamic, dynamic, dynamic) → void
+  function throwNoSuchMethod(obj, name, arguments, expectedArgumentNames) {
+    let memberName = new _internal.Symbol.unvalidated(name);
+    throw new core.NoSuchMethodError(obj, memberName, arguments, new core.Map(), expectedArgumentNames);
+  }
+  // Function throwCyclicInit: (String) → void
+  function throwCyclicInit(staticName) {
+    throw new core.CyclicInitializationError(`Cyclic initialization for static ${staticName}`);
+  }
+  class RuntimeError extends core.Error {
+    RuntimeError(message) {
+      this.message = message;
+      super.Error();
+    }
+    toString() {
+      return `RuntimeError: ${this.message}`;
+    }
+  }
+  class DeferredNotLoadedError extends core.Error {
+    DeferredNotLoadedError(libraryName) {
+      this.libraryName = libraryName;
+      super.Error();
+    }
+    toString() {
+      return `Deferred library ${this.libraryName} was not loaded.`;
+    }
+  }
+  class RuntimeType extends dart.Object {
+    RuntimeType() {
+    }
+  }
+  class RuntimeFunctionType extends RuntimeType {
+    RuntimeFunctionType(returnType, parameterTypes, optionalParameterTypes, namedParameters) {
+      this.returnType = returnType;
+      this.parameterTypes = parameterTypes;
+      this.optionalParameterTypes = optionalParameterTypes;
+      this.namedParameters = namedParameters;
+      super.RuntimeType();
+    }
+    get isVoid() {
+      return dart.is(this.returnType, VoidRuntimeType);
+    }
+    _isTest(expression) {
+      let functionTypeObject = this._extractFunctionTypeObjectFrom(expression);
+      return functionTypeObject === null ? false : isFunctionSubtype(functionTypeObject, this.toRti());
+    }
+    _asCheck(expression) {
+      return this._check(_foreign_helper.JS('', '#', expression), true);
+    }
+    _assertCheck(expression) {
+      if (inAssert)
+        return null;
+      inAssert = true;
+      try {
+        return this._check(_foreign_helper.JS('', '#', expression), false);
+      } finally {
+        inAssert = false;
+      }
+    }
+    _check(expression, isCast) {
+      if (expression === null)
+        return null;
+      if (this._isTest(expression))
+        return expression;
+      let self = new FunctionTypeInfoDecoderRing(this.toRti()).toString();
+      if (isCast) {
+        let functionTypeObject = this._extractFunctionTypeObjectFrom(expression);
+        let pretty = null;
+        if (functionTypeObject !== null) {
+          pretty = new FunctionTypeInfoDecoderRing(functionTypeObject).toString();
+        } else {
+          pretty = Primitives.objectTypeName(expression);
+        }
+        throw new CastErrorImplementation(pretty, self);
+      } else {
+        throw new TypeErrorImplementation(expression, self);
+      }
+    }
+    _extractFunctionTypeObjectFrom(o) {
+      let interceptor = _interceptors.getInterceptor(o);
+      return _foreign_helper.JS('bool', '# in #', _foreign_helper.JS_SIGNATURE_NAME(), interceptor) ? _foreign_helper.JS('', '#[#]()', interceptor, _foreign_helper.JS_SIGNATURE_NAME()) : null;
+    }
+    toRti() {
+      let result = _foreign_helper.JS('=Object', '{ #: "dynafunc" }', _foreign_helper.JS_FUNCTION_TYPE_TAG());
+      if (this.isVoid) {
+        _foreign_helper.JS('', '#[#] = true', result, _foreign_helper.JS_FUNCTION_TYPE_VOID_RETURN_TAG());
+      } else {
+        if (!dart.is(this.returnType, DynamicRuntimeType)) {
+          _foreign_helper.JS('', '#[#] = #', result, _foreign_helper.JS_FUNCTION_TYPE_RETURN_TYPE_TAG(), this.returnType.toRti());
+        }
+      }
+      if (dart.notNull(this.parameterTypes !== null) && dart.notNull(!dart.notNull(this.parameterTypes.isEmpty))) {
+        _foreign_helper.JS('', '#[#] = #', result, _foreign_helper.JS_FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG(), listToRti(this.parameterTypes));
+      }
+      if (dart.notNull(this.optionalParameterTypes !== null) && dart.notNull(!dart.notNull(this.optionalParameterTypes.isEmpty))) {
+        _foreign_helper.JS('', '#[#] = #', result, _foreign_helper.JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG(), listToRti(this.optionalParameterTypes));
+      }
+      if (this.namedParameters !== null) {
+        let namedRti = _foreign_helper.JS('=Object', 'Object.create(null)');
+        let keys = _js_names.extractKeys(this.namedParameters);
+        for (let i = 0; i < keys.length; i++) {
+          let name = keys.get(i);
+          let rti = dart.dinvoke(_foreign_helper.JS('', '#[#]', this.namedParameters, name), 'toRti');
+          _foreign_helper.JS('', '#[#] = #', namedRti, name, rti);
+        }
+        _foreign_helper.JS('', '#[#] = #', result, _foreign_helper.JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG(), namedRti);
+      }
+      return result;
+    }
+    static listToRti(list) {
+      list = _foreign_helper.JS('JSFixedArray', '#', list);
+      let result = _foreign_helper.JS('JSExtendableArray', '[]');
+      for (let i = 0; i['<'](dart.dload(list, 'length')); i++) {
+        _foreign_helper.JS('', '#.push(#)', result, dart.dinvoke(dart.dindex(list, i), 'toRti'));
+      }
+      return result;
+    }
+    toString() {
+      let result = '(';
+      let needsComma = false;
+      if (this.parameterTypes !== null) {
+        for (let i = 0; i < this.parameterTypes.length; i++) {
+          let type = this.parameterTypes.get(i);
+          if (needsComma)
+            result = ', ';
+          result = `${type}`;
+          needsComma = true;
+        }
+      }
+      if (dart.notNull(this.optionalParameterTypes !== null) && dart.notNull(!dart.notNull(this.optionalParameterTypes.isEmpty))) {
+        if (needsComma)
+          result = ', ';
+        needsComma = false;
+        result = '[';
+        for (let i = 0; i < this.optionalParameterTypes.length; i++) {
+          let type = this.optionalParameterTypes.get(i);
+          if (needsComma)
+            result = ', ';
+          result = `${type}`;
+          needsComma = true;
+        }
+        result = ']';
+      } else if (this.namedParameters !== null) {
+        if (needsComma)
+          result = ', ';
+        needsComma = false;
+        result = '{';
+        let keys = _js_names.extractKeys(this.namedParameters);
+        for (let i = 0; i < keys.length; i++) {
+          let name = keys.get(i);
+          if (needsComma)
+            result = ', ';
+          let rti = dart.dinvoke(_foreign_helper.JS('', '#[#]', this.namedParameters, name), 'toRti');
+          result = `${rti} ${_foreign_helper.JS("String", "#", name)}`;
+          needsComma = true;
+        }
+        result = '}';
+      }
+      result = `) -> ${this.returnType}`;
+      return result;
+    }
+  }
+  RuntimeFunctionType.inAssert = false;
+  // Function buildFunctionType: (dynamic, dynamic, dynamic) → RuntimeFunctionType
+  function buildFunctionType(returnType, parameterTypes, optionalParameterTypes) {
+    return new RuntimeFunctionType(returnType, parameterTypes, optionalParameterTypes, null);
+  }
+  // Function buildNamedFunctionType: (dynamic, dynamic, dynamic) → RuntimeFunctionType
+  function buildNamedFunctionType(returnType, parameterTypes, namedParameters) {
+    return new RuntimeFunctionType(returnType, parameterTypes, null, namedParameters);
+  }
+  // Function buildInterfaceType: (dynamic, dynamic) → RuntimeType
+  function buildInterfaceType(rti, typeArguments) {
+    let name = dart.as(_foreign_helper.JS('String|Null', '#.name', rti), core.String);
+    if (core.bool['||'](typeArguments === null, dart.dload(typeArguments, 'isEmpty'))) {
+      return new RuntimeTypePlain(name);
+    }
+    return new RuntimeTypeGeneric(name, typeArguments, null);
+  }
+  class DynamicRuntimeType extends RuntimeType {
+    DynamicRuntimeType() {
+      super.RuntimeType();
+    }
+    toString() {
+      return 'dynamic';
+    }
+    toRti() {
+      return null;
+    }
+  }
+  // Function getDynamicRuntimeType: () → RuntimeType
+  function getDynamicRuntimeType() {
+    return new DynamicRuntimeType();
+  }
+  class VoidRuntimeType extends RuntimeType {
+    VoidRuntimeType() {
+      super.RuntimeType();
+    }
+    toString() {
+      return 'void';
+    }
+    toRti() {
+      return dart.throw_('internal error');
+    }
+  }
+  // Function getVoidRuntimeType: () → RuntimeType
+  function getVoidRuntimeType() {
+    return new VoidRuntimeType();
+  }
+  // Function functionTypeTestMetaHelper: () → dynamic
+  function functionTypeTestMetaHelper() {
+    let dyn = _foreign_helper.JS('', 'x');
+    let dyn2 = _foreign_helper.JS('', 'x');
+    let fixedListOrNull = dart.as(_foreign_helper.JS('JSFixedArray|Null', 'x'), core.List);
+    let fixedListOrNull2 = dart.as(_foreign_helper.JS('JSFixedArray|Null', 'x'), core.List);
+    let fixedList = dart.as(_foreign_helper.JS('JSFixedArray', 'x'), core.List);
+    let jsObject = _foreign_helper.JS('=Object', 'x');
+    buildFunctionType(dyn, fixedListOrNull, fixedListOrNull2);
+    buildNamedFunctionType(dyn, fixedList, jsObject);
+    buildInterfaceType(dyn, fixedListOrNull);
+    getDynamicRuntimeType();
+    getVoidRuntimeType();
+    convertRtiToRuntimeType(dyn);
+    dart.dinvoke(dyn, '_isTest', dyn2);
+    dart.dinvoke(dyn, '_asCheck', dyn2);
+    dart.dinvoke(dyn, '_assertCheck', dyn2);
+  }
+  // Function convertRtiToRuntimeType: (dynamic) → RuntimeType
+  function convertRtiToRuntimeType(rti) {
+    if (rti === null) {
+      return getDynamicRuntimeType();
+    } else if (_foreign_helper.JS('bool', 'typeof # == "function"', rti)) {
+      return new RuntimeTypePlain(_foreign_helper.JS('String', 'rti.name'));
+    } else if (_foreign_helper.JS('bool', '#.constructor == Array', rti)) {
+      let list = dart.as(_foreign_helper.JS('JSFixedArray', '#', rti), core.List);
+      let name = dart.as(_foreign_helper.JS('String', '#.name', list.get(0)), core.String);
+      let arguments = new List.from([]);
+      for (let i = 1; i < list.length; i++) {
+        arguments.add(convertRtiToRuntimeType(list.get(i)));
+      }
+      return new RuntimeTypeGeneric(name, arguments, rti);
+    } else if (_foreign_helper.JS('bool', '"func" in #', rti)) {
+      return new FunctionTypeInfoDecoderRing(rti).toRuntimeType();
+    } else {
+      throw new RuntimeError("Cannot convert " + `'${_foreign_helper.JS('String', 'JSON.stringify(#)', rti)}' to RuntimeType.`);
+    }
+  }
+  class RuntimeTypePlain extends RuntimeType {
+    RuntimeTypePlain(name) {
+      this.name = name;
+      super.RuntimeType();
+    }
+    toRti() {
+      let allClasses = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.ALL_CLASSES, core.String));
+      let rti = _foreign_helper.JS('', '#[#]', allClasses, this.name);
+      if (rti === null)
+        throw `no type for '${this.name}'`;
+      return rti;
+    }
+    toString() {
+      return this.name;
+    }
+  }
+  class RuntimeTypeGeneric extends RuntimeType {
+    RuntimeTypeGeneric(name, arguments, rti) {
+      this.name = name;
+      this.arguments = arguments;
+      this.rti = rti;
+      super.RuntimeType();
+    }
+    toRti() {
+      if (this.rti !== null)
+        return this.rti;
+      let allClasses = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.ALL_CLASSES, core.String));
+      let result = _foreign_helper.JS('JSExtendableArray', '[#[#]]', allClasses, this.name);
+      if (dart.dindex(result, 0) === null) {
+        throw `no type for '${this.name}<...>'`;
+      }
+      for (let argument of this.arguments) {
+        _foreign_helper.JS('', '#.push(#)', result, argument.toRti());
+      }
+      return this.rti = result;
+    }
+    toString() {
+      return `${this.name}<${this.arguments.join(", ")}>`;
+    }
+  }
+  class FunctionTypeInfoDecoderRing extends dart.Object {
+    FunctionTypeInfoDecoderRing(_typeData) {
+      this._typeData = _typeData;
+      this._cachedToString = null;
+    }
+    get _hasReturnType() {
+      return dart.as(_foreign_helper.JS('bool', '"ret" in #', this._typeData), core.bool);
+    }
+    get _returnType() {
+      return _foreign_helper.JS('', '#.ret', this._typeData);
+    }
+    get _isVoid() {
+      return dart.as(_foreign_helper.JS('bool', '!!#.void', this._typeData), core.bool);
+    }
+    get _hasArguments() {
+      return dart.as(_foreign_helper.JS('bool', '"args" in #', this._typeData), core.bool);
+    }
+    get _arguments() {
+      return dart.as(_foreign_helper.JS('JSExtendableArray', '#.args', this._typeData), core.List);
+    }
+    get _hasOptionalArguments() {
+      return dart.as(_foreign_helper.JS('bool', '"opt" in #', this._typeData), core.bool);
+    }
+    get _optionalArguments() {
+      return dart.as(_foreign_helper.JS('JSExtendableArray', '#.opt', this._typeData), core.List);
+    }
+    get _hasNamedArguments() {
+      return dart.as(_foreign_helper.JS('bool', '"named" in #', this._typeData), core.bool);
+    }
+    get _namedArguments() {
+      return _foreign_helper.JS('=Object', '#.named', this._typeData);
+    }
+    toRuntimeType() {
+      return new DynamicRuntimeType();
+    }
+    _convert(type) {
+      let result = runtimeTypeToString(type);
+      if (result !== null)
+        return result;
+      if (_foreign_helper.JS('bool', '"func" in #', type)) {
+        return new FunctionTypeInfoDecoderRing(type).toString();
+      } else {
+        throw 'bad type';
+      }
+    }
+    toString() {
+      if (this._cachedToString !== null)
+        return this._cachedToString;
+      let s = "(";
+      let sep = '';
+      if (this._hasArguments) {
+        for (let argument of this._arguments) {
+          s = sep;
+          s = this._convert(argument);
+          sep = ', ';
+        }
+      }
+      if (this._hasOptionalArguments) {
+        s = `${sep}[`;
+        sep = '';
+        for (let argument of this._optionalArguments) {
+          s = sep;
+          s = this._convert(argument);
+          sep = ', ';
+        }
+        s = ']';
+      }
+      if (this._hasNamedArguments) {
+        s = `${sep}{`;
+        sep = '';
+        for (let name of _js_names.extractKeys(this._namedArguments)) {
+          s = sep;
+          s = `${name}: `;
+          s = this._convert(_foreign_helper.JS('', '#[#]', this._namedArguments, name));
+          sep = ', ';
+        }
+        s = '}';
+      }
+      s = ') -> ';
+      if (this._isVoid) {
+        s = 'void';
+      } else if (this._hasReturnType) {
+        s = this._convert(this._returnType);
+      } else {
+        s = 'dynamic';
+      }
+      return this._cachedToString = `${s}`;
+    }
+  }
+  class UnimplementedNoSuchMethodError extends core.Error {
+    UnimplementedNoSuchMethodError(_message) {
+      this._message = _message;
+      super.Error();
+    }
+    toString() {
+      return `Unsupported operation: ${this._message}`;
+    }
+  }
+  // Function random64: () → int
+  function random64() {
+    let int32a = dart.as(_foreign_helper.JS("int", "(Math.random() * 0x100000000) >>> 0"), core.int);
+    let int32b = dart.as(_foreign_helper.JS("int", "(Math.random() * 0x100000000) >>> 0"), core.int);
+    return int32a + int32b * 4294967296;
+  }
+  // Function jsonEncodeNative: (String) → String
+  function jsonEncodeNative(string) {
+    return dart.as(_foreign_helper.JS("String", "JSON.stringify(#)", string), core.String);
+  }
+  // Function getIsolateAffinityTag: (String) → String
+  function getIsolateAffinityTag(name) {
+    let isolateTagGetter = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.GET_ISOLATE_TAG, core.String));
+    return dart.as(_foreign_helper.JS('String', '#(#)', isolateTagGetter, name), core.String);
+  }
+  // Function _loadLibraryWrapper: (String) → () → Future<Null>
+  function _loadLibraryWrapper(loadId) {
+    return () => loadDeferredLibrary(loadId);
+  }
+  dart.defineLazyProperties(_js_helper, {
+    get _loadingLibraries() {
+      return dart.map();
+    },
+    get _loadedLibraries() {
+      return new core.Set();
+    }
+  });
+  _js_helper.deferredLoadHook = null;
+  // Function loadDeferredLibrary: (String) → Future<Null>
+  function loadDeferredLibrary(loadId) {
+    let urisMap = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.DEFERRED_LIBRARY_URIS, core.String));
+    let uris = dart.as(_foreign_helper.JS('JSExtendableArray|Null', '#[#]', urisMap, loadId), core.List$(core.String));
+    let hashesMap = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.DEFERRED_LIBRARY_HASHES, core.String));
+    let hashes = dart.as(_foreign_helper.JS('JSExtendableArray|Null', '#[#]', hashesMap, loadId), core.List$(core.String));
+    if (uris === null)
+      return dart.as(new async.Future.value(null), async.Future$(core.Null));
+    let indices = dart.as(new core.List.generate(uris.length, (i) => i), core.List$(core.int));
+    let isHunkLoaded = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.IS_HUNK_LOADED, core.String));
+    let isHunkInitialized = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.IS_HUNK_INITIALIZED, core.String));
+    let indicesToLoad = indices.where((i) => dart.throw_("Unimplemented PrefixExpression: !JS('bool', '#(#)', isHunkLoaded, hashes[i])")).toList();
+    return dart.as(async.Future.wait(dart.as(indicesToLoad.map((i) => _loadHunk(uris.get(i))), core.Iterable$(async.Future))).then((_) => {
+      let indicesToInitialize = indices.where((i) => dart.throw_("Unimplemented PrefixExpression: !JS('bool', '#(#)', isHunkInitialized, hashes[i])")).toList();
+      for (let i of indicesToInitialize) {
+        let initializer = _foreign_helper.JS_EMBEDDED_GLOBAL('', dart.as(_js_embedded_names.INITIALIZE_LOADED_HUNK, core.String));
+        _foreign_helper.JS('void', '#(#)', initializer, hashes.get(i));
+      }
+      let updated = _js_helper._loadedLibraries.add(loadId);
+      if (dart.notNull(updated) && dart.notNull(_js_helper.deferredLoadHook !== null)) {
+        _js_helper.deferredLoadHook();
+      }
+    }), async.Future$(core.Null));
+  }
+  // Function _loadHunk: (String) → Future<Null>
+  function _loadHunk(hunkName) {
+    let future = _js_helper._loadingLibraries.get(hunkName);
+    if (future !== null) {
+      return dart.as(future.then((_) => null), async.Future$(core.Null));
+    }
+    let uri = _isolate_helper.IsolateNatives.thisScript;
+    let index = uri.lastIndexOf('/');
+    uri = `${uri.substring(0, index + 1)}${hunkName}`;
+    if (dart.notNull(Primitives.isJsshell) || dart.notNull(Primitives.isD8)) {
+      return _js_helper._loadingLibraries.set(hunkName, new async.Future(() => {
+        try {
+          _foreign_helper.JS('void', '(new Function(#))()', `load("${uri}")`);
+        } catch (error) {
+          let stackTrace = dart.stackTrace(error);
+          throw new async.DeferredLoadException(`Loading ${uri} failed.`);
+        }
+
+        return null;
+      }));
+    } else if (_isolate_helper.isWorker()) {
+      return _js_helper._loadingLibraries.set(hunkName, new async.Future(() => {
+        let completer = new async.Completer();
+        _isolate_helper.enterJsAsync();
+        let leavingFuture = dart.as(completer.future.whenComplete(() => {
+          _isolate_helper.leaveJsAsync();
+        }), async.Future$(core.Null));
+        let index = uri.lastIndexOf('/');
+        uri = `${uri.substring(0, index + 1)}${hunkName}`;
+        let xhr = _foreign_helper.JS('dynamic', 'new XMLHttpRequest()');
+        _foreign_helper.JS('void', '#.open("GET", #)', xhr, uri);
+        _foreign_helper.JS('void', '#.addEventListener("load", #, false)', xhr, convertDartClosureToJS((event) => {
+          if (!dart.equals(_foreign_helper.JS('int', '#.status', xhr), 200)) {
+            completer.completeError(new async.DeferredLoadException(`Loading ${uri} failed.`));
+            return;
+          }
+          let code = dart.as(_foreign_helper.JS('String', '#.responseText', xhr), core.String);
+          try {
+            _foreign_helper.JS('void', '(new Function(#))()', code);
+          } catch (error) {
+            let stackTrace = dart.stackTrace(error);
+            completer.completeError(new async.DeferredLoadException(`Evaluating ${uri} failed.`));
+            return;
+          }
+
+          completer.complete(null);
+        }, 1));
+        let fail = convertDartClosureToJS((event) => {
+          new async.DeferredLoadException(`Loading ${uri} failed.`);
+        }, 1);
+        _foreign_helper.JS('void', '#.addEventListener("error", #, false)', xhr, fail);
+        _foreign_helper.JS('void', '#.addEventListener("abort", #, false)', xhr, fail);
+        _foreign_helper.JS('void', '#.send()', xhr);
+        return leavingFuture;
+      }));
+    }
+    return _js_helper._loadingLibraries.set(hunkName, new async.Future(() => {
+      let completer = new async.Completer();
+      let script = _foreign_helper.JS('', 'document.createElement("script")');
+      _foreign_helper.JS('', '#.type = "text/javascript"', script);
+      _foreign_helper.JS('', '#.src = #', script, uri);
+      _foreign_helper.JS('', '#.addEventListener("load", #, false)', script, convertDartClosureToJS((event) => {
+        completer.complete(null);
+      }, 1));
+      _foreign_helper.JS('', '#.addEventListener("error", #, false)', script, convertDartClosureToJS((event) => {
+        completer.completeError(new async.DeferredLoadException(`Loading ${uri} failed.`));
+      }, 1));
+      _foreign_helper.JS('', 'document.body.appendChild(#)', script);
+      return completer.future;
+    }));
+  }
+  class MainError extends core.Error {
+    MainError(_message) {
+      this._message = _message;
+      super.Error();
+    }
+    toString() {
+      return `NoSuchMethodError: ${this._message}`;
+    }
+  }
+  // Function missingMain: () → void
+  function missingMain() {
+    throw new MainError("No top-level function named 'main'.");
+  }
+  // Function badMain: () → void
+  function badMain() {
+    throw new MainError("'main' is not a function.");
+  }
+  // Function mainHasTooManyParameters: () → void
+  function mainHasTooManyParameters() {
+    throw new MainError("'main' expects too many parameters.");
+  }
+  class NoSideEffects extends dart.Object {
+    NoSideEffects() {
+    }
+  }
+  class NoThrows extends dart.Object {
+    NoThrows() {
+    }
+  }
+  class NoInline extends dart.Object {
+    NoInline() {
+    }
+  }
+  class IrRepresentation extends dart.Object {
+    IrRepresentation(value) {
+      this.value = value;
+    }
+  }
+  class Native extends dart.Object {
+    Native(name) {
+      this.name = name;
+    }
+  }
+  let ConstantMap$ = dart.generic(function(K, V) {
+    class ConstantMap extends dart.Object {
+      ConstantMap$_() {
+      }
+      get isEmpty() {
+        return this.length === 0;
+      }
+      get isNotEmpty() {
+        return !dart.notNull(this.isEmpty);
+      }
+      toString() {
+        return collection.Maps.mapToString(this);
+      }
+      _throwUnmodifiable() {
+        throw new core.UnsupportedError("Cannot modify unmodifiable Map");
+      }
+      set(key, val) {
+        return this._throwUnmodifiable();
+      }
+      putIfAbsent(key, ifAbsent) {
+        return dart.as(this._throwUnmodifiable(), V);
+      }
+      remove(key) {
+        return dart.as(this._throwUnmodifiable(), V);
+      }
+      clear() {
+        return this._throwUnmodifiable();
+      }
+      addAll(other) {
+        return this._throwUnmodifiable();
+      }
+    }
+    dart.defineNamedConstructor(ConstantMap, '_');
+    return ConstantMap;
+  });
+  let ConstantMap = ConstantMap$(dynamic, dynamic);
+  let ConstantStringMap$ = dart.generic(function(K, V) {
+    class ConstantStringMap extends ConstantMap$(K, V) {
+      ConstantStringMap$_(length, _jsObject, _keys) {
+        this.length = length;
+        this._jsObject = _jsObject;
+        this._keys = _keys;
+        super.ConstantMap$_();
+      }
+      containsValue(needle) {
+        return this.values.any((value) => dart.equals(value, needle));
+      }
+      containsKey(key) {
+        if (!(typeof key == string))
+          return false;
+        if (dart.equals('__proto__', key))
+          return false;
+        return jsHasOwnProperty(this._jsObject, dart.as(key, core.String));
+      }
+      get(key) {
+        if (!dart.notNull(this.containsKey(key)))
+          return dart.as(null, V);
+        return dart.as(this._fetch(key), V);
+      }
+      _fetch(key) {
+        return jsPropertyAccess(this._jsObject, dart.as(key, core.String));
+      }
+      forEach(f) {
+        let keys = _foreign_helper.JS('JSArray', '#', this._keys);
+        for (let i = 0; i['<'](dart.dload(keys, 'length')); i++) {
+          let key = dart.dindex(keys, i);
+          f(dart.as(key, K), dart.as(this._fetch(key), V));
+        }
+      }
+      get keys() {
+        return new _ConstantMapKeyIterable(this);
+      }
+      get values() {
+        return new _internal.MappedIterable(this._keys, ((key) => this._fetch(key)).bind(this));
+      }
+    }
+    dart.defineNamedConstructor(ConstantStringMap, '_');
+    return ConstantStringMap;
+  });
+  let ConstantStringMap = ConstantStringMap$(dynamic, dynamic);
+  let ConstantProtoMap$ = dart.generic(function(K, V) {
+    class ConstantProtoMap extends ConstantStringMap$(K, V) {
+      ConstantProtoMap$_(length, jsObject, keys, _protoValue) {
+        this._protoValue = _protoValue;
+        super.ConstantStringMap$_(dart.as(length, core.int), jsObject, dart.as(keys, core.List$(K)));
+      }
+      containsKey(key) {
+        if (!(typeof key == string))
+          return false;
+        if (dart.equals('__proto__', key))
+          return true;
+        return jsHasOwnProperty(this._jsObject, dart.as(key, core.String));
+      }
+      _fetch(key) {
+        return dart.equals('__proto__', key) ? this._protoValue : jsPropertyAccess(this._jsObject, dart.as(key, core.String));
+      }
+    }
+    dart.defineNamedConstructor(ConstantProtoMap, '_');
+    return ConstantProtoMap;
+  });
+  let ConstantProtoMap = ConstantProtoMap$(dynamic, dynamic);
+  let _ConstantMapKeyIterable$ = dart.generic(function(K) {
+    class _ConstantMapKeyIterable extends collection.IterableBase$(K) {
+      _ConstantMapKeyIterable(_map) {
+        this._map = _map;
+        super.IterableBase();
+      }
+      get iterator() {
+        return this._map._keys.iterator;
+      }
+      get length() {
+        return this._map._keys.length;
+      }
+    }
+    return _ConstantMapKeyIterable;
+  });
+  let _ConstantMapKeyIterable = _ConstantMapKeyIterable$(dynamic);
+  let GeneralConstantMap$ = dart.generic(function(K, V) {
+    class GeneralConstantMap extends ConstantMap$(K, V) {
+      GeneralConstantMap(_jsData) {
+        this._jsData = _jsData;
+        super.ConstantMap$_();
+      }
+      _getMap() {
+        if (_foreign_helper.JS('bool', '!this.$map')) {
+          let backingMap = new collection.LinkedHashMap();
+          _foreign_helper.JS('', 'this.$map = #', fillLiteralMap(this._jsData, backingMap));
+        }
+        return dart.as(_foreign_helper.JS('Map', 'this.$map'), core.Map$(K, V));
+      }
+      containsValue(needle) {
+        return this._getMap().containsValue(needle);
+      }
+      containsKey(key) {
+        return this._getMap().containsKey(key);
+      }
+      get(key) {
+        return this._getMap().get(key);
+      }
+      forEach(f) {
+        this._getMap().forEach(f);
+      }
+      get keys() {
+        return this._getMap().keys;
+      }
+      get values() {
+        return this._getMap().values;
+      }
+      get length() {
+        return this._getMap().length;
+      }
+    }
+    return GeneralConstantMap;
+  });
+  let GeneralConstantMap = GeneralConstantMap$(dynamic, dynamic);
+  // Function contains: (String, String) → bool
+  function contains(userAgent, name) {
+    return !dart.equals(_foreign_helper.JS('int', '#.indexOf(#)', userAgent, name), -1);
+  }
+  // Function arrayLength: (List<dynamic>) → int
+  function arrayLength(array) {
+    return dart.as(_foreign_helper.JS('int', '#.length', array), core.int);
+  }
+  // Function arrayGet: (List<dynamic>, int) → dynamic
+  function arrayGet(array, index) {
+    return _foreign_helper.JS('var', '#[#]', array, index);
+  }
+  // Function arraySet: (List<dynamic>, int, dynamic) → void
+  function arraySet(array, index, value) {
+    _foreign_helper.JS('var', '#[#] = #', array, index, value);
+  }
+  // Function propertyGet: (dynamic, String) → dynamic
+  function propertyGet(object, property) {
+    return _foreign_helper.JS('var', '#[#]', object, property);
+  }
+  // Function callHasOwnProperty: (dynamic, dynamic, String) → bool
+  function callHasOwnProperty(function, object, property) {
+    return dart.as(_foreign_helper.JS('bool', '#.call(#, #)', function, object, property), core.bool);
+  }
+  // Function propertySet: (dynamic, String, dynamic) → void
+  function propertySet(object, property, value) {
+    _foreign_helper.JS('var', '#[#] = #', object, property, value);
+  }
+  // Function getPropertyFromPrototype: (dynamic, String) → dynamic
+  function getPropertyFromPrototype(object, name) {
+    return _foreign_helper.JS('var', 'Object.getPrototypeOf(#)[#]', object, name);
+  }
+  _js_helper.getTagFunction = null;
+  _js_helper.alternateTagFunction = null;
+  _js_helper.prototypeForTagFunction = null;
+  // Function toStringForNativeObject: (dynamic) → String
+  function toStringForNativeObject(obj) {
+    let name = dart.as(_js_helper.getTagFunction === null ? '<Unknown>' : _foreign_helper.JS('String', '#', dart.dinvokef(_js_helper.getTagFunction, obj)), core.String);
+    return `Instance of ${name}`;
+  }
+  // Function hashCodeForNativeObject: (dynamic) → int
+  function hashCodeForNativeObject(object) {
+    return Primitives.objectHashCode(object);
+  }
+  // Function defineProperty: (dynamic, String, dynamic) → void
+  function defineProperty(obj, property, value) {
+    _foreign_helper.JS('void', 'Object.defineProperty(#, #, ' + '{value: #, enumerable: false, writable: true, configurable: true})', obj, property, value);
+  }
+  // Function isDartObject: (dynamic) → bool
+  function isDartObject(obj) {
+    return dart.as(_foreign_helper.JS('bool', '((#) instanceof (#))', obj, _foreign_helper.JS_DART_OBJECT_CONSTRUCTOR()), core.bool);
+  }
+  dart.copyProperties(_js_helper, {
+    get interceptorsByTag() {
+      return _foreign_helper.JS_EMBEDDED_GLOBAL('=Object', dart.as(_js_embedded_names.INTERCEPTORS_BY_TAG, core.String));
+    },
+    get leafTags() {
+      return _foreign_helper.JS_EMBEDDED_GLOBAL('=Object', dart.as(_js_embedded_names.LEAF_TAGS, core.String));
+    }
+  });
+  // Function findDispatchTagForInterceptorClass: (dynamic) → String
+  function findDispatchTagForInterceptorClass(interceptorClassConstructor) {
+    return dart.as(_foreign_helper.JS('', '#.#', interceptorClassConstructor, _js_embedded_names.NATIVE_SUPERCLASS_TAG_NAME), core.String);
+  }
+  _js_helper.dispatchRecordsForInstanceTags = null;
+  _js_helper.interceptorsForUncacheableTags = null;
+  // Function lookupInterceptor: (String) → dynamic
+  function lookupInterceptor(tag) {
+    return propertyGet(_js_helper.interceptorsByTag, tag);
+  }
+  let UNCACHED_MARK = '~';
+  let INSTANCE_CACHED_MARK = '!';
+  let LEAF_MARK = '-';
+  let INTERIOR_MARK = '+';
+  let DISCRIMINATED_MARK = '*';
+  // Function lookupAndCacheInterceptor: (dynamic) → dynamic
+  function lookupAndCacheInterceptor(obj) {
+    dart.assert(!dart.notNull(isDartObject(obj)));
+    let tag = dart.as(dart.dinvokef(_js_helper.getTagFunction, obj), core.String);
+    let record = propertyGet(_js_helper.dispatchRecordsForInstanceTags, tag);
+    if (record !== null)
+      return patchInstance(obj, record);
+    let interceptor = propertyGet(_js_helper.interceptorsForUncacheableTags, tag);
+    if (interceptor !== null)
+      return interceptor;
+    let interceptorClass = lookupInterceptor(tag);
+    if (interceptorClass === null) {
+      tag = dart.as(dart.dinvokef(_js_helper.alternateTagFunction, obj, tag), core.String);
+      if (tag !== null) {
+        record = propertyGet(_js_helper.dispatchRecordsForInstanceTags, tag);
+        if (record !== null)
+          return patchInstance(obj, record);
+        interceptor = propertyGet(_js_helper.interceptorsForUncacheableTags, tag);
+        if (interceptor !== null)
+          return interceptor;
+        interceptorClass = lookupInterceptor(tag);
+      }
+    }
+    if (interceptorClass === null) {
+      return null;
+    }
+    interceptor = _foreign_helper.JS('', '#.prototype', interceptorClass);
+    let mark = _foreign_helper.JS('String|Null', '#[0]', tag);
+    if (dart.equals(mark, INSTANCE_CACHED_MARK)) {
+      record = makeLeafDispatchRecord(interceptor);
+      propertySet(_js_helper.dispatchRecordsForInstanceTags, tag, record);
+      return patchInstance(obj, record);
+    }
+    if (dart.equals(mark, UNCACHED_MARK)) {
+      propertySet(_js_helper.interceptorsForUncacheableTags, tag, interceptor);
+      return interceptor;
+    }
+    if (dart.equals(mark, LEAF_MARK)) {
+      return patchProto(obj, makeLeafDispatchRecord(interceptor));
+    }
+    if (dart.equals(mark, INTERIOR_MARK)) {
+      return patchInteriorProto(obj, interceptor);
+    }
+    if (dart.equals(mark, DISCRIMINATED_MARK)) {
+      throw new core.UnimplementedError(tag);
+    }
+    let isLeaf = _foreign_helper.JS('bool', '(#[#]) === true', _js_helper.leafTags, tag);
+    if (isLeaf) {
+      return patchProto(obj, makeLeafDispatchRecord(interceptor));
+    } else {
+      return patchInteriorProto(obj, interceptor);
+    }
+  }
+  // Function patchInstance: (dynamic, dynamic) → dynamic
+  function patchInstance(obj, record) {
+    _interceptors.setDispatchProperty(obj, record);
+    return _interceptors.dispatchRecordInterceptor(record);
+  }
+  // Function patchProto: (dynamic, dynamic) → dynamic
+  function patchProto(obj, record) {
+    _interceptors.setDispatchProperty(_foreign_helper.JS('', 'Object.getPrototypeOf(#)', obj), record);
+    return _interceptors.dispatchRecordInterceptor(record);
+  }
+  // Function patchInteriorProto: (dynamic, dynamic) → dynamic
+  function patchInteriorProto(obj, interceptor) {
+    let proto = _foreign_helper.JS('', 'Object.getPrototypeOf(#)', obj);
+    let record = _interceptors.makeDispatchRecord(interceptor, proto, null, null);
+    _interceptors.setDispatchProperty(proto, record);
+    return interceptor;
+  }
+  // Function makeLeafDispatchRecord: (dynamic) → dynamic
+  function makeLeafDispatchRecord(interceptor) {
+    let fieldName = _foreign_helper.JS_IS_INDEXABLE_FIELD_NAME();
+    let indexability = dart.as(_foreign_helper.JS('bool', '!!#[#]', interceptor, fieldName), core.bool);
+    return _interceptors.makeDispatchRecord(interceptor, false, null, indexability);
+  }
+  // Function makeDefaultDispatchRecord: (dynamic, dynamic, dynamic) → dynamic
+  function makeDefaultDispatchRecord(tag, interceptorClass, proto) {
+    let interceptor = _foreign_helper.JS('', '#.prototype', interceptorClass);
+    let isLeaf = _foreign_helper.JS('bool', '(#[#]) === true', _js_helper.leafTags, tag);
+    if (isLeaf) {
+      return makeLeafDispatchRecord(interceptor);
+    } else {
+      return _interceptors.makeDispatchRecord(interceptor, proto, null, null);
+    }
+  }
+  // Function setNativeSubclassDispatchRecord: (dynamic, dynamic) → dynamic
+  function setNativeSubclassDispatchRecord(proto, interceptor) {
+    _interceptors.setDispatchProperty(proto, makeLeafDispatchRecord(interceptor));
+  }
+  // Function constructorNameFallback: (dynamic) → String
+  function constructorNameFallback(object) {
+    return dart.as(_foreign_helper.JS('String', '#(#)', _constructorNameFallback, object), core.String);
+  }
+  _js_helper.initNativeDispatchFlag = null;
+  // Function initNativeDispatch: () → void
+  function initNativeDispatch() {
+    if (true === _js_helper.initNativeDispatchFlag)
+      return;
+    _js_helper.initNativeDispatchFlag = true;
+    initNativeDispatchContinue();
+  }
+  // Function initNativeDispatchContinue: () → void
+  function initNativeDispatchContinue() {
+    _js_helper.dispatchRecordsForInstanceTags = _foreign_helper.JS('', 'Object.create(null)');
+    _js_helper.interceptorsForUncacheableTags = _foreign_helper.JS('', 'Object.create(null)');
+    initHooks();
+    let map = _js_helper.interceptorsByTag;
+    let tags = _foreign_helper.JS('JSMutableArray', 'Object.getOwnPropertyNames(#)', map);
+    if (_foreign_helper.JS('bool', 'typeof window != "undefined"')) {
+      let context = _foreign_helper.JS('=Object', 'window');
+      let fun = _foreign_helper.JS('=Object', 'function () {}');
+      for (let i = 0; i['<'](dart.dload(tags, 'length')); i++) {
+        let tag = dart.dindex(tags, i);
+        let proto = dart.dinvokef(_js_helper.prototypeForTagFunction, tag);
+        if (proto !== null) {
+          let interceptorClass = _foreign_helper.JS('', '#[#]', map, tag);
+          let record = makeDefaultDispatchRecord(tag, interceptorClass, proto);
+          if (record !== null) {
+            _interceptors.setDispatchProperty(proto, record);
+            _foreign_helper.JS('', '#.prototype = #', fun, proto);
+          }
+        }
+      }
+    }
+    for (let i = 0; i['<'](dart.dload(tags, 'length')); i++) {
+      let tag = _foreign_helper.JS('String', '#[#]', tags, i);
+      if (_foreign_helper.JS('bool', '/^[A-Za-z_]/.test(#)', tag)) {
+        let interceptorClass = propertyGet(map, dart.as(tag, core.String));
+        propertySet(map, dart.as(dart.dbinary(INSTANCE_CACHED_MARK, '+', tag), core.String), interceptorClass);
+        propertySet(map, dart.as(dart.dbinary(UNCACHED_MARK, '+', tag), core.String), interceptorClass);
+        propertySet(map, dart.as(dart.dbinary(LEAF_MARK, '+', tag), core.String), interceptorClass);
+        propertySet(map, dart.as(dart.dbinary(INTERIOR_MARK, '+', tag), core.String), interceptorClass);
+        propertySet(map, dart.as(dart.dbinary(DISCRIMINATED_MARK, '+', tag), core.String), interceptorClass);
+      }
+    }
+  }
+  // Function initHooks: () → void
+  function initHooks() {
+    let hooks = _foreign_helper.JS('', '#()', _baseHooks);
+    let _fallbackConstructorHooksTransformer = _foreign_helper.JS('', '#(#)', _fallbackConstructorHooksTransformerGenerator, _constructorNameFallback);
+    hooks = applyHooksTransformer(_fallbackConstructorHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_firefoxHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_ieHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_operaHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_safariHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_fixDocumentHooksTransformer, hooks);
+    hooks = applyHooksTransformer(_dartExperimentalFixupGetTagHooksTransformer, hooks);
+    if (_foreign_helper.JS('bool', 'typeof dartNativeDispatchHooksTransformer != "undefined"')) {
+      let transformers = _foreign_helper.JS('', 'dartNativeDispatchHooksTransformer');
+      if (_foreign_helper.JS('bool', 'typeof # == "function"', transformers)) {
+        transformers = new List.from([transformers]);
+      }
+      if (_foreign_helper.JS('bool', '#.constructor == Array', transformers)) {
+        for (let i = 0; i['<'](_foreign_helper.JS('int', '#.length', transformers)); i++) {
+          let transformer = _foreign_helper.JS('', '#[#]', transformers, i);
+          if (_foreign_helper.JS('bool', 'typeof # == "function"', transformer)) {
+            hooks = applyHooksTransformer(transformer, hooks);
+          }
+        }
+      }
+    }
+    let getTag = _foreign_helper.JS('', '#.getTag', hooks);
+    let getUnknownTag = _foreign_helper.JS('', '#.getUnknownTag', hooks);
+    let prototypeForTag = _foreign_helper.JS('', '#.prototypeForTag', hooks);
+    _js_helper.getTagFunction = (o) => _foreign_helper.JS('String|Null', '#(#)', getTag, o);
+    _js_helper.alternateTagFunction = (o, tag) => _foreign_helper.JS('String|Null', '#(#, #)', getUnknownTag, o, tag);
+    _js_helper.prototypeForTagFunction = (tag) => _foreign_helper.JS('', '#(#)', prototypeForTag, tag);
+  }
+  // Function applyHooksTransformer: (dynamic, dynamic) → dynamic
+  function applyHooksTransformer(transformer, hooks) {
+    let newHooks = _foreign_helper.JS('=Object|Null', '#(#)', transformer, hooks);
+    return _foreign_helper.JS('', '# || #', newHooks, hooks);
+  }
+  let _baseHooks = new _foreign_helper.JS_CONST('\nfunction() {\n  function typeNameInChrome(o) {\n    var constructor = o.constructor;\n    if (constructor) {\n      var name = constructor.name;\n      if (name) return name;\n    }\n    var s = Object.prototype.toString.call(o);\n    return s.substring(8, s.length - 1);\n  }\n  function getUnknownTag(object, tag) {\n    // This code really belongs in [getUnknownTagGenericBrowser] but having it\n    // here allows [getUnknownTag] to be tested on d8.\n    if (/^HTML[A-Z].*Element$/.test(tag)) {\n      // Check that it is not a simple JavaScript object.\n      var name = Object.prototype.toString.call(object);\n      if (name == "[object Object]") return null;\n      return "HTMLElement";\n    }\n  }\n  function getUnknownTagGenericBrowser(object, tag) {\n    if (self.HTMLElement && object instanceof HTMLElement) return "HTMLElement";\n    return getUnknownTag(object, tag);\n  }\n  function prototypeForTag(tag) {\n    if (typeof window == "undefined") return null;\n    if (typeof window[tag] == "undefined") return null;\n    var constructor = window[tag];\n    if (typeof constructor != "function") return null;\n    return constructor.prototype;\n  }\n  function discriminator(tag) { return null; }\n\n  var isBrowser = typeof navigator == "object";\n\n  return {\n    getTag: typeNameInChrome,\n    getUnknownTag: isBrowser ? getUnknownTagGenericBrowser : getUnknownTag,\n    prototypeForTag: prototypeForTag,\n    discriminator: discriminator };\n}');
+  let _constructorNameFallback = new _foreign_helper.JS_CONST('\nfunction getTagFallback(o) {\n  var constructor = o.constructor;\n  if (typeof constructor == "function") {\n    var name = constructor.name;\n    // If the name is a non-empty string, we use that as the type name of this\n    // object.  There are various cases where that does not work, so we have to\n    // detect them and fall through to the toString() based implementation.\n\n    if (typeof name == "string" &&\n\n        // Sometimes the string is empty.  This test also catches minified\n        // shadow dom polyfil wrapper for Window on Firefox where the faked\n        // constructor name does not \'stick\'.  The shortest real DOM object\n        // names have three characters (e.g. URL, CSS).\n        name.length > 2 &&\n\n        // On Firefox we often get "Object" as the constructor name, even for\n        // more specialized DOM objects.\n        name !== "Object" &&\n\n        // This can happen in Opera.\n        name !== "Function.prototype") {\n      return name;\n    }\n  }\n  var s = Object.prototype.toString.call(o);\n  return s.substring(8, s.length - 1);\n}');
+  let _fallbackConstructorHooksTransformerGenerator = new _foreign_helper.JS_CONST('\nfunction(getTagFallback) {\n  return function(hooks) {\n    // If we are not in a browser, assume we are in d8.\n    // TODO(sra): Recognize jsshell.\n    if (typeof navigator != "object") return hooks;\n\n    var ua = navigator.userAgent;\n    // TODO(antonm): remove a reference to DumpRenderTree.\n    if (ua.indexOf("DumpRenderTree") >= 0) return hooks;\n    if (ua.indexOf("Chrome") >= 0) {\n      // Confirm constructor name is usable for dispatch.\n      function confirm(p) {\n        return typeof window == "object" && window[p] && window[p].name == p;\n      }\n      if (confirm("Window") && confirm("HTMLElement")) return hooks;\n    }\n\n    hooks.getTag = getTagFallback;\n  };\n}');
+  let _ieHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) {\n  var userAgent = typeof navigator == "object" ? navigator.userAgent : "";\n  if (userAgent.indexOf("Trident/") == -1) return hooks;\n\n  var getTag = hooks.getTag;\n\n  var quickMap = {\n    "BeforeUnloadEvent": "Event",\n    "DataTransfer": "Clipboard",\n    "HTMLDDElement": "HTMLElement",\n    "HTMLDTElement": "HTMLElement",\n    "HTMLPhraseElement": "HTMLElement",\n    "Position": "Geoposition"\n  };\n\n  function getTagIE(o) {\n    var tag = getTag(o);\n    var newTag = quickMap[tag];\n    if (newTag) return newTag;\n    // Patches for types which report themselves as Objects.\n    if (tag == "Object") {\n      if (window.DataView && (o instanceof window.DataView)) return "DataView";\n    }\n    return tag;\n  }\n\n  function prototypeForTagIE(tag) {\n    var constructor = window[tag];\n    if (constructor == null) return null;\n    return constructor.prototype;\n  }\n\n  hooks.getTag = getTagIE;\n  hooks.prototypeForTag = prototypeForTagIE;\n}');
+  let _fixDocumentHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) {\n  var getTag = hooks.getTag;\n  var prototypeForTag = hooks.prototypeForTag;\n  function getTagFixed(o) {\n    var tag = getTag(o);\n    if (tag == "Document") {\n      // Some browsers and the polymer polyfill call both HTML and XML documents\n      // "Document", so we check for the xmlVersion property, which is the empty\n      // string on HTML documents. Since both dart:html classes Document and\n      // HtmlDocument share the same type, we must patch the instances and not\n      // the prototype.\n      if (!!o.xmlVersion) return "!Document";\n      return "!HTMLDocument";\n    }\n    return tag;\n  }\n\n  function prototypeForTagFixed(tag) {\n    if (tag == "Document") return null;  // Do not pre-patch Document.\n    return prototypeForTag(tag);\n  }\n\n  hooks.getTag = getTagFixed;\n  hooks.prototypeForTag = prototypeForTagFixed;\n}');
+  let _firefoxHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) {\n  var userAgent = typeof navigator == "object" ? navigator.userAgent : "";\n  if (userAgent.indexOf("Firefox") == -1) return hooks;\n\n  var getTag = hooks.getTag;\n\n  var quickMap = {\n    "BeforeUnloadEvent": "Event",\n    "DataTransfer": "Clipboard",\n    "GeoGeolocation": "Geolocation",\n    "Location": "!Location",               // Fixes issue 18151\n    "WorkerMessageEvent": "MessageEvent",\n    "XMLDocument": "!Document"};\n\n  function getTagFirefox(o) {\n    var tag = getTag(o);\n    return quickMap[tag] || tag;\n  }\n\n  hooks.getTag = getTagFirefox;\n}');
+  let _operaHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) { return hooks; }\n');
+  let _safariHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) { return hooks; }\n');
+  let _dartExperimentalFixupGetTagHooksTransformer = new _foreign_helper.JS_CONST('\nfunction(hooks) {\n  if (typeof dartExperimentalFixupGetTag != "function") return hooks;\n  hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);\n}');
+  // Function regExpGetNative: (JSSyntaxRegExp) → dynamic
+  function regExpGetNative(regexp) {
+    return regexp._nativeRegExp;
+  }
+  // Function regExpGetGlobalNative: (JSSyntaxRegExp) → dynamic
+  function regExpGetGlobalNative(regexp) {
+    let nativeRegexp = regexp._nativeGlobalVersion;
+    _foreign_helper.JS("void", "#.lastIndex = 0", nativeRegexp);
+    return nativeRegexp;
+  }
+  // Function regExpCaptureCount: (JSSyntaxRegExp) → int
+  function regExpCaptureCount(regexp) {
+    let nativeAnchoredRegExp = regexp._nativeAnchoredVersion;
+    let match = _foreign_helper.JS('JSExtendableArray', "#.exec('')", nativeAnchoredRegExp);
+    return dart.as(dart.dbinary(dart.dload(match, 'length'), '-', 2), core.int);
+  }
+  class JSSyntaxRegExp extends dart.Object {
+    toString() {
+      return `RegExp/${this.pattern}/`;
+    }
+    JSSyntaxRegExp(source, opt$) {
+      let multiLine = opt$.multiLine === void 0 ? false : opt$.multiLine;
+      let caseSensitive = opt$.caseSensitive === void 0 ? true : opt$.caseSensitive;
+      this.pattern = source;
+      this._nativeRegExp = makeNative(source, multiLine, caseSensitive, false);
+      this._nativeGlobalRegExp = null;
+      this._nativeAnchoredRegExp = null;
+    }
+    get _nativeGlobalVersion() {
+      if (this._nativeGlobalRegExp !== null)
+        return this._nativeGlobalRegExp;
+      return this._nativeGlobalRegExp = makeNative(this.pattern, this._isMultiLine, this._isCaseSensitive, true);
+    }
+    get _nativeAnchoredVersion() {
+      if (this._nativeAnchoredRegExp !== null)
+        return this._nativeAnchoredRegExp;
+      return this._nativeAnchoredRegExp = makeNative(`${this.pattern}|()`, this._isMultiLine, this._isCaseSensitive, true);
+    }
+    get _isMultiLine() {
+      return dart.as(_foreign_helper.JS("bool", "#.multiline", this._nativeRegExp), core.bool);
+    }
+    get _isCaseSensitive() {
+      return dart.as(_foreign_helper.JS("bool", "!#.ignoreCase", this._nativeRegExp), core.bool);
+    }
+    static makeNative(source, multiLine, caseSensitive, global) {
+      checkString(source);
+      let m = multiLine ? 'm' : '';
+      let i = caseSensitive ? '' : 'i';
+      let g = global ? 'g' : '';
+      let regexp = _foreign_helper.JS('', '(function() {' + 'try {' + 'return new RegExp(#, # + # + #);' + '} catch (e) {' + 'return e;' + '}' + '})()', source, m, i, g);
+      if (_foreign_helper.JS('bool', '# instanceof RegExp', regexp))
+        return regexp;
+      let errorMessage = dart.as(_foreign_helper.JS('String', 'String(#)', regexp), core.String);
+      throw new core.FormatException(`Illegal RegExp pattern: ${source}, ${errorMessage}`);
+    }
+    firstMatch(string) {
+      let m = dart.as(_foreign_helper.JS('JSExtendableArray|Null', '#.exec(#)', this._nativeRegExp, checkString(string)), core.List$(core.String));
+      if (m === null)
+        return null;
+      return new _MatchImplementation(this, m);
+    }
+    hasMatch(string) {
+      return dart.as(_foreign_helper.JS('bool', '#.test(#)', this._nativeRegExp, checkString(string)), core.bool);
+    }
+    stringMatch(string) {
+      let match = this.firstMatch(string);
+      if (match !== null)
+        return match.group(0);
+      return null;
+    }
+    allMatches(string, start) {
+      if (start === void 0)
+        start = 0;
+      checkString(string);
+      checkInt(start);
+      if (dart.notNull(start < 0) || dart.notNull(start > string.length)) {
+        throw new core.RangeError.range(start, 0, string.length);
+      }
+      return new _AllMatchesIterable(this, string, start);
+    }
+    _execGlobal(string, start) {
+      let regexp = this._nativeGlobalVersion;
+      _foreign_helper.JS("void", "#.lastIndex = #", regexp, start);
+      let match = dart.as(_foreign_helper.JS("JSExtendableArray|Null", "#.exec(#)", regexp, string), core.List);
+      if (match === null)
+        return null;
+      return new _MatchImplementation(this, match);
+    }
+    _execAnchored(string, start) {
+      let regexp = this._nativeAnchoredVersion;
+      _foreign_helper.JS("void", "#.lastIndex = #", regexp, start);
+      let match = dart.as(_foreign_helper.JS("JSExtendableArray|Null", "#.exec(#)", regexp, string), core.List);
+      if (match === null)
+        return null;
+      if (match.get(match.length - 1) !== null)
+        return null;
+      match.length = 1;
+      return new _MatchImplementation(this, match);
+    }
+    matchAsPrefix(string, start) {
+      if (start === void 0)
+        start = 0;
+      if (dart.notNull(start < 0) || dart.notNull(start > string.length)) {
+        throw new core.RangeError.range(start, 0, string.length);
+      }
+      return this._execAnchored(string, start);
+    }
+    get isMultiLine() {
+      return this._isMultiLine;
+    }
+    get isCaseSensitive() {
+      return this._isCaseSensitive;
+    }
+  }
+  class _MatchImplementation extends dart.Object {
+    _MatchImplementation(pattern, _match) {
+      this.pattern = pattern;
+      this._match = _match;
+      dart.assert(typeof _foreign_helper.JS("var", "#.input", this._match) == string);
+      dart.assert(typeof _foreign_helper.JS("var", "#.index", this._match) == number);
+    }
+    get input() {
+      return dart.as(_foreign_helper.JS("String", "#.input", this._match), core.String);
+    }
+    get start() {
+      return dart.as(_foreign_helper.JS("int", "#.index", this._match), core.int);
+    }
+    get end() {
+      return this.start + this._match.get(0).length;
+    }
+    group(index) {
+      return this._match.get(index);
+    }
+    get(index) {
+      return this.group(index);
+    }
+    get groupCount() {
+      return this._match.length - 1;
+    }
+    groups(groups) {
+      let out = dart.as(new List.from([]), core.List$(core.String));
+      for (let i of groups) {
+        out.add(this.group(i));
+      }
+      return out;
+    }
+  }
+  class _AllMatchesIterable extends collection.IterableBase$(core.Match) {
+    _AllMatchesIterable(_re, _string, _start) {
+      this._re = _re;
+      this._string = _string;
+      this._start = _start;
+      super.IterableBase();
+    }
+    get iterator() {
+      return new _AllMatchesIterator(this._re, this._string, this._start);
+    }
+  }
+  class _AllMatchesIterator extends dart.Object {
+    _AllMatchesIterator(_regExp, _string, _nextIndex) {
+      this._regExp = _regExp;
+      this._string = _string;
+      this._nextIndex = _nextIndex;
+      this._current = null;
+    }
+    get current() {
+      return this._current;
+    }
+    moveNext() {
+      if (this._string === null)
+        return false;
+      if (this._nextIndex <= this._string.length) {
+        let match = this._regExp._execGlobal(this._string, this._nextIndex);
+        if (match !== null) {
+          this._current = match;
+          let nextIndex = match.end;
+          if (match.start === nextIndex) {
+            nextIndex++;
+          }
+          this._nextIndex = nextIndex;
+          return true;
+        }
+      }
+      this._current = null;
+      this._string = null;
+      return false;
+    }
+  }
+  // Function firstMatchAfter: (JSSyntaxRegExp, String, int) → Match
+  function firstMatchAfter(regExp, string, start) {
+    return regExp._execGlobal(string, start);
+  }
+  class StringMatch extends dart.Object {
+    StringMatch(start, input, pattern) {
+      this.start = start;
+      this.input = input;
+      this.pattern = pattern;
+    }
+    get end() {
+      return this.start + this.pattern.length;
+    }
+    get(g) {
+      return this.group(g);
+    }
+    get groupCount() {
+      return 0;
+    }
+    group(group_) {
+      if (group_ !== 0) {
+        throw new core.RangeError.value(group_);
+      }
+      return this.pattern;
+    }
+    groups(groups_) {
+      let result = new core.List();
+      for (let g of groups_) {
+        result.add(this.group(g));
+      }
+      return result;
+    }
+  }
+  // Function allMatchesInStringUnchecked: (String, String, int) → List<Match>
+  function allMatchesInStringUnchecked(needle, haystack, startIndex) {
+    let result = new core.List();
+    let length = haystack.length;
+    let patternLength = needle.length;
+    while (true) {
+      let position = haystack.indexOf(needle, startIndex);
+      if (position === -1) {
+        break;
+      }
+      result.add(new StringMatch(position, haystack, needle));
+      let endIndex = position + patternLength;
+      if (endIndex === length) {
+        break;
+      } else if (position === endIndex) {
+        ++startIndex;
+      } else {
+        startIndex = endIndex;
+      }
+    }
+    return result;
+  }
+  // Function stringContainsUnchecked: (dynamic, dynamic, dynamic) → dynamic
+  function stringContainsUnchecked(receiver, other, startIndex) {
+    if (typeof other == string) {
+      return !dart.equals(dart.dinvoke(receiver, 'indexOf', other, startIndex), -1);
+    } else if (dart.is(other, JSSyntaxRegExp)) {
+      return dart.dinvoke(other, 'hasMatch', dart.dinvoke(receiver, 'substring', startIndex));
+    } else {
+      let substr = dart.dinvoke(receiver, 'substring', startIndex);
+      return dart.dload(dart.dinvoke(other, 'allMatches', substr), 'isNotEmpty');
+    }
+  }
+  // Function stringReplaceJS: (dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceJS(receiver, replacer, to) {
+    to = _foreign_helper.JS('String', '#.replace(/\\$/g, "$$$$")', to);
+    return _foreign_helper.JS('String', '#.replace(#, #)', receiver, replacer, to);
+  }
+  // Function stringReplaceFirstRE: (dynamic, dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceFirstRE(receiver, regexp, to, startIndex) {
+    let match = dart.dinvoke(regexp, '_execGlobal', receiver, startIndex);
+    if (match === null)
+      return receiver;
+    let start = dart.dload(match, 'start');
+    let end = dart.dload(match, 'end');
+    return `${dart.dinvoke(receiver, 'substring', 0, start)}${to}${dart.dinvoke(receiver, 'substring', end)}`;
+  }
+  let ESCAPE_REGEXP = '[[\\]{}()*+?.\\\\^$|]';
+  // Function stringReplaceAllUnchecked: (dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceAllUnchecked(receiver, from, to) {
+    checkString(to);
+    if (typeof from == string) {
+      if (dart.equals(from, "")) {
+        if (dart.equals(receiver, "")) {
+          return to;
+        } else {
+          let result = new core.StringBuffer();
+          let length = dart.as(dart.dload(receiver, 'length'), core.int);
+          result.write(to);
+          for (let i = 0; i < length; i++) {
+            result.write(dart.dindex(receiver, i));
+            result.write(to);
+          }
+          return result.toString();
+        }
+      } else {
+        let quoter = _foreign_helper.JS('', "new RegExp(#, 'g')", ESCAPE_REGEXP);
+        let quoted = _foreign_helper.JS('String', '#.replace(#, "\\\\$&")', from, quoter);
+        let replacer = _foreign_helper.JS('', "new RegExp(#, 'g')", quoted);
+        return stringReplaceJS(receiver, replacer, to);
+      }
+    } else if (dart.is(from, JSSyntaxRegExp)) {
+      let re = regExpGetGlobalNative(dart.as(from, JSSyntaxRegExp));
+      return stringReplaceJS(receiver, re, to);
+    } else {
+      checkNull(from);
+      throw "String.replaceAll(Pattern) UNIMPLEMENTED";
+    }
+  }
+  // Function _matchString: (Match) → String
+  function _matchString(match) {
+    return match.get(0);
+  }
+  // Function _stringIdentity: (String) → String
+  function _stringIdentity(string) {
+    return string;
+  }
+  // Function stringReplaceAllFuncUnchecked: (dynamic, dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceAllFuncUnchecked(receiver, pattern, onMatch, onNonMatch) {
+    if (!dart.is(pattern, core.Pattern)) {
+      throw new core.ArgumentError(`${pattern} is not a Pattern`);
+    }
+    if (onMatch === null)
+      onMatch = _matchString;
+    if (onNonMatch === null)
+      onNonMatch = _stringIdentity;
+    if (typeof pattern == string) {
+      return stringReplaceAllStringFuncUnchecked(receiver, pattern, onMatch, onNonMatch);
+    }
+    let buffer = new core.StringBuffer();
+    let startIndex = 0;
+    for (let match of dart.dinvoke(pattern, 'allMatches', receiver)) {
+      buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex, match.start)));
+      buffer.write(dart.dinvokef(onMatch, match));
+      startIndex = match.end;
+    }
+    buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex)));
+    return buffer.toString();
+  }
+  // Function stringReplaceAllEmptyFuncUnchecked: (dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceAllEmptyFuncUnchecked(receiver, onMatch, onNonMatch) {
+    let buffer = new core.StringBuffer();
+    let length = dart.as(dart.dload(receiver, 'length'), core.int);
+    let i = 0;
+    buffer.write(dart.dinvokef(onNonMatch, ""));
+    while (i < length) {
+      buffer.write(dart.dinvokef(onMatch, new StringMatch(i, receiver, "")));
+      let code = dart.as(dart.dinvoke(receiver, 'codeUnitAt', i), core.int);
+      if (dart.notNull((code & ~1023) === 55296) && dart.notNull(length > i + 1)) {
+        code = dart.as(dart.dinvoke(receiver, 'codeUnitAt', i + 1), core.int);
+        if ((code & ~1023) === 56320) {
+          buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', i, i + 2)));
+          i = 2;
+          continue;
+        }
+      }
+      buffer.write(dart.dinvokef(onNonMatch, dart.dindex(receiver, i)));
+      i++;
+    }
+    buffer.write(dart.dinvokef(onMatch, new StringMatch(i, receiver, "")));
+    buffer.write(dart.dinvokef(onNonMatch, ""));
+    return buffer.toString();
+  }
+  // Function stringReplaceAllStringFuncUnchecked: (dynamic, dynamic, dynamic, dynamic) → dynamic
+  function stringReplaceAllStringFuncUnchecked(receiver, pattern, onMatch, onNonMatch) {
+    let patternLength = dart.as(dart.dload(pattern, 'length'), core.int);
+    if (patternLength === 0) {
+      return stringReplaceAllEmptyFuncUnchecked(receiver, onMatch, onNonMatch);
+    }
+    let length = dart.as(dart.dload(receiver, 'length'), core.int);
+    let buffer = new core.StringBuffer();
+    let startIndex = 0;
+    while (startIndex < length) {
+      let position = dart.as(dart.dinvoke(receiver, 'indexOf', pattern, startIndex), core.int);
+      if (position === -1) {
+        break;
+      }
+      buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex, position)));
+      buffer.write(dart.dinvokef(onMatch, new StringMatch(position, receiver, pattern)));
+      startIndex = position + patternLength;
+    }
+    buffer.write(dart.dinvokef(onNonMatch, dart.dinvoke(receiver, 'substring', startIndex)));
+    return buffer.toString();
+  }
+  // Function stringReplaceFirstUnchecked: (dynamic, dynamic, dynamic, [int]) → dynamic
+  function stringReplaceFirstUnchecked(receiver, from, to, startIndex) {
+    if (startIndex === void 0)
+      startIndex = 0;
+    if (typeof from == string) {
+      let index = dart.dinvoke(receiver, 'indexOf', from, startIndex);
+      if (dart.dbinary(index, '<', 0))
+        return receiver;
+      return `${dart.dinvoke(receiver, 'substring', 0, index)}${to}` + `${dart.dinvoke(receiver, 'substring', dart.dbinary(index, '+', dart.dload(from, 'length')))}`;
+    } else if (dart.is(from, JSSyntaxRegExp)) {
+      return startIndex === 0 ? stringReplaceJS(receiver, regExpGetNative(dart.as(from, JSSyntaxRegExp)), to) : stringReplaceFirstRE(receiver, from, to, startIndex);
+    } else {
+      checkNull(from);
+      throw "String.replace(Pattern) UNIMPLEMENTED";
+    }
+  }
+  // Function stringJoinUnchecked: (dynamic, dynamic) → dynamic
+  function stringJoinUnchecked(array, separator) {
+    return _foreign_helper.JS('String', '#.join(#)', array, separator);
+  }
+  // Function createRuntimeType: (String) → Type
+  function createRuntimeType(name) {
+    return new TypeImpl(name);
+  }
+  class TypeImpl extends dart.Object {
+    TypeImpl(_typeName) {
+      this._typeName = _typeName;
+      this._unmangledName = null;
+    }
+    toString() {
+      if (this._unmangledName !== null)
+        return this._unmangledName;
+      let unmangledName = _js_names.unmangleAllIdentifiersIfPreservedAnyways(this._typeName);
+      return this._unmangledName = unmangledName;
+    }
+    get hashCode() {
+      return this._typeName.hashCode;
+    }
+    ['=='](other) {
+      return dart.notNull(dart.is(other, TypeImpl)) && dart.notNull(dart.equals(this._typeName, dart.dload(other, '_typeName')));
+    }
+  }
+  class TypeVariable extends dart.Object {
+    TypeVariable(owner, name, bound) {
+      this.owner = owner;
+      this.name = name;
+      this.bound = bound;
+    }
+  }
+  // Function getMangledTypeName: (TypeImpl) → dynamic
+  function getMangledTypeName(type) {
+    return type._typeName;
+  }
+  // Function setRuntimeTypeInfo: (Object, dynamic) → Object
+  function setRuntimeTypeInfo(target, typeInfo) {
+    dart.assert(dart.notNull(typeInfo === null) || dart.notNull(isJsArray(typeInfo)));
+    if (target !== null)
+      _foreign_helper.JS('var', '#.$builtinTypeInfo = #', target, typeInfo);
+    return target;
+  }
+  // Function getRuntimeTypeInfo: (Object) → dynamic
+  function getRuntimeTypeInfo(target) {
+    if (target === null)
+      return null;
+    return _foreign_helper.JS('var', '#.$builtinTypeInfo', target);
+  }
+  // Function getRuntimeTypeArguments: (dynamic, dynamic) → dynamic
+  function getRuntimeTypeArguments(target, substitutionName) {
+    let substitution = getField(target, `${_foreign_helper.JS_OPERATOR_AS_PREFIX()}${substitutionName}`);
+    return substitute(substitution, getRuntimeTypeInfo(target));
+  }
+  // Function getRuntimeTypeArgument: (Object, String, int) → dynamic
+  function getRuntimeTypeArgument(target, substitutionName, index) {
+    let arguments = getRuntimeTypeArguments(target, substitutionName);
+    return arguments === null ? null : getIndex(arguments, index);
+  }
+  // Function getTypeArgumentByIndex: (Object, int) → dynamic
+  function getTypeArgumentByIndex(target, index) {
+    let rti = getRuntimeTypeInfo(target);
+    return rti === null ? null : getIndex(rti, index);
+  }
+  // Function copyTypeArguments: (Object, Object) → void
+  function copyTypeArguments(source, target) {
+    _foreign_helper.JS('var', '#.$builtinTypeInfo = #.$builtinTypeInfo', target, source);
+  }
+  // Function getClassName: (dynamic) → String
+  function getClassName(object) {
+    return dart.as(_foreign_helper.JS('String', '#.constructor.builtin$cls', _interceptors.getInterceptor(object)), core.String);
+  }
+  // Function getRuntimeTypeAsString: (dynamic, {onTypeVariable: (int) → String}) → String
+  function getRuntimeTypeAsString(runtimeType, opt$) {
+    let onTypeVariable = opt$.onTypeVariable === void 0 ? null : opt$.onTypeVariable;
+    dart.assert(isJsArray(runtimeType));
+    let className = getConstructorName(getIndex(runtimeType, 0));
+    return `${className}` + `${joinArguments(runtimeType, 1, {onTypeVariable: onTypeVariable})}`;
+  }
+  // Function getConstructorName: (dynamic) → String
+  function getConstructorName(type) {
+    return dart.as(_foreign_helper.JS('String', '#.builtin$cls', type), core.String);
+  }
+  // Function runtimeTypeToString: (dynamic, {onTypeVariable: (int) → String}) → String
+  function runtimeTypeToString(type, opt$) {
+    let onTypeVariable = opt$.onTypeVariable === void 0 ? null : opt$.onTypeVariable;
+    if (type === null) {
+      return 'dynamic';
+    } else if (isJsArray(type)) {
+      return getRuntimeTypeAsString(type, {onTypeVariable: onTypeVariable});
+    } else if (isJsFunction(type)) {
+      return getConstructorName(type);
+    } else if (typeof type == number) {
+      if (onTypeVariable === null) {
+        return dart.as(dart.dinvoke(type, 'toString'), core.String);
+      } else {
+        return onTypeVariable(dart.as(type, core.int));
+      }
+    } else {
+      return null;
+    }
+  }
+  // Function joinArguments: (dynamic, int, {onTypeVariable: (int) → String}) → String
+  function joinArguments(types, startIndex, opt$) {
+    let onTypeVariable = opt$.onTypeVariable === void 0 ? null : opt$.onTypeVariable;
+    if (types === null)
+      return '';
+    dart.assert(isJsArray(types));
+    let firstArgument = true;
+    let allDynamic = true;
+    let buffer = new core.StringBuffer();
+    for (let index = startIndex; index < getLength(types); index++) {
+      if (firstArgument) {
+        firstArgument = false;
+      } else {
+        buffer.write(', ');
+      }
+      let argument = getIndex(types, index);
+      if (argument !== null) {
+        allDynamic = false;
+      }
+      buffer.write(runtimeTypeToString(argument, {onTypeVariable: onTypeVariable}));
+    }
+    return allDynamic ? '' : `<${buffer}>`;
+  }
+  // Function getRuntimeTypeString: (dynamic) → String
+  function getRuntimeTypeString(object) {
+    let className = getClassName(object);
+    if (object === null)
+      return className;
+    let typeInfo = _foreign_helper.JS('var', '#.$builtinTypeInfo', object);
+    return `${className}${joinArguments(typeInfo, 0)}`;
+  }
+  // Function getRuntimeType: (dynamic) → Type
+  function getRuntimeType(object) {
+    let type = getRuntimeTypeString(object);
+    return new TypeImpl(type);
+  }
+  // Function substitute: (dynamic, dynamic) → dynamic
+  function substitute(substitution, arguments) {
+    dart.assert(dart.notNull(substitution === null) || dart.notNull(isJsFunction(substitution)));
+    dart.assert(dart.notNull(arguments === null) || dart.notNull(isJsArray(arguments)));
+    if (isJsFunction(substitution)) {
+      substitution = invoke(substitution, arguments);
+      if (isJsArray(substitution)) {
+        arguments = substitution;
+      } else if (isJsFunction(substitution)) {
+        arguments = invoke(substitution, arguments);
+      }
+    }
+    return arguments;
+  }
+  // Function checkSubtype: (Object, String, List<dynamic>, String) → bool
+  function checkSubtype(object, isField, checks, asField) {
+    if (object === null)
+      return false;
+    let arguments = getRuntimeTypeInfo(object);
+    let interceptor = _interceptors.getInterceptor(object);
+    let isSubclass = getField(interceptor, isField);
+    if (isSubclass === null)
+      return false;
+    let substitution = getField(interceptor, asField);
+    return checkArguments(substitution, arguments, checks);
+  }
+  // Function computeTypeName: (String, List<dynamic>) → String
+  function computeTypeName(isField, arguments) {
+    let prefixLength = _foreign_helper.JS_OPERATOR_IS_PREFIX().length;
+    return Primitives.formatType(isField.substring(prefixLength, isField.length), arguments);
+  }
+  // Function subtypeCast: (Object, String, List<dynamic>, String) → Object
+  function subtypeCast(object, isField, checks, asField) {
+    if (dart.notNull(object !== null) && dart.notNull(!dart.notNull(checkSubtype(object, isField, checks, asField)))) {
+      let actualType = Primitives.objectTypeName(object);
+      let typeName = computeTypeName(isField, checks);
+      throw new CastErrorImplementation(actualType, typeName);
+    }
+    return object;
+  }
+  // Function assertSubtype: (Object, String, List<dynamic>, String) → Object
+  function assertSubtype(object, isField, checks, asField) {
+    if (dart.notNull(object !== null) && dart.notNull(!dart.notNull(checkSubtype(object, isField, checks, asField)))) {
+      let typeName = computeTypeName(isField, checks);
+      throw new TypeErrorImplementation(object, typeName);
+    }
+    return object;
+  }
+  // Function assertIsSubtype: (dynamic, dynamic, String) → dynamic
+  function assertIsSubtype(subtype, supertype, message) {
+    if (!dart.notNull(isSubtype(subtype, supertype))) {
+      throwTypeError(message);
+    }
+  }
+  // Function throwTypeError: (dynamic) → dynamic
+  function throwTypeError(message) {
+    throw new TypeErrorImplementation.fromMessage(message);
+  }
+  // Function checkArguments: (dynamic, dynamic, dynamic) → bool
+  function checkArguments(substitution, arguments, checks) {
+    return areSubtypes(substitute(substitution, arguments), checks);
+  }
+  // Function areSubtypes: (dynamic, dynamic) → bool
+  function areSubtypes(s, t) {
+    if (dart.notNull(s === null) || dart.notNull(t === null))
+      return true;
+    dart.assert(isJsArray(s));
+    dart.assert(isJsArray(t));
+    dart.assert(getLength(s) === getLength(t));
+    let len = getLength(s);
+    for (let i = 0; i < len; i++) {
+      if (!dart.notNull(isSubtype(getIndex(s, i), getIndex(t, i)))) {
+        return false;
+      }
+    }
+    return true;
+  }
+  // Function computeSignature: (dynamic, dynamic, dynamic) → dynamic
+  function computeSignature(signature, context, contextName) {
+    let typeArguments = getRuntimeTypeArguments(context, contextName);
+    return invokeOn(signature, context, typeArguments);
+  }
+  // Function isSupertypeOfNull: (dynamic) → bool
+  function isSupertypeOfNull(type) {
+    return dart.notNull(dart.notNull(type === null) || dart.notNull(dart.equals(getConstructorName(type), _foreign_helper.JS_OBJECT_CLASS_NAME()))) || dart.notNull(dart.equals(getConstructorName(type), _foreign_helper.JS_NULL_CLASS_NAME()));
+  }
+  // Function checkSubtypeOfRuntimeType: (dynamic, dynamic) → bool
+  function checkSubtypeOfRuntimeType(o, t) {
+    if (o === null)
+      return isSupertypeOfNull(t);
+    if (t === null)
+      return true;
+    let rti = getRuntimeTypeInfo(o);
+    o = _interceptors.getInterceptor(o);
+    let type = _foreign_helper.JS('', '#.constructor', o);
+    if (rti !== null) {
+      rti = _foreign_helper.JS('JSExtendableArray', '#.slice()', rti);
+      _foreign_helper.JS('', '#.splice(0, 0, #)', rti, type);
+      type = rti;
+    } else if (hasField(t, `${_foreign_helper.JS_FUNCTION_TYPE_TAG()}`)) {
+      let signatureName = `${_foreign_helper.JS_OPERATOR_IS_PREFIX()}_${getField(t, _foreign_helper.JS_FUNCTION_TYPE_TAG())}`;
+      if (hasField(o, signatureName))
+        return true;
+      let targetSignatureFunction = getField(o, `${_foreign_helper.JS_SIGNATURE_NAME()}`);
+      if (targetSignatureFunction === null)
+        return false;
+      type = invokeOn(targetSignatureFunction, o, null);
+      return isFunctionSubtype(type, t);
+    }
+    return isSubtype(type, t);
+  }
+  // Function subtypeOfRuntimeTypeCast: (Object, dynamic) → Object
+  function subtypeOfRuntimeTypeCast(object, type) {
+    if (dart.notNull(object !== null) && dart.notNull(!dart.notNull(checkSubtypeOfRuntimeType(object, type)))) {
+      let actualType = Primitives.objectTypeName(object);
+      throw new CastErrorImplementation(actualType, runtimeTypeToString(type));
+    }
+    return object;
+  }
+  // Function assertSubtypeOfRuntimeType: (Object, dynamic) → Object
+  function assertSubtypeOfRuntimeType(object, type) {
+    if (dart.notNull(object !== null) && dart.notNull(!dart.notNull(checkSubtypeOfRuntimeType(object, type)))) {
+      throw new TypeErrorImplementation(object, runtimeTypeToString(type));
+    }
+    return object;
+  }
+  // Function getArguments: (dynamic) → dynamic
+  function getArguments(type) {
+    return isJsArray(type) ? _foreign_helper.JS('var', '#.slice(1)', type) : null;
+  }
+  // Function isSubtype: (dynamic, dynamic) → bool
+  function isSubtype(s, t) {
+    if (isIdentical(s, t))
+      return true;
+    if (dart.notNull(s === null) || dart.notNull(t === null))
+      return true;
+    if (hasField(t, `${_foreign_helper.JS_FUNCTION_TYPE_TAG()}`)) {
+      return isFunctionSubtype(s, t);
+    }
+    if (hasField(s, `${_foreign_helper.JS_FUNCTION_TYPE_TAG()}`)) {
+      return dart.equals(getConstructorName(t), _foreign_helper.JS_FUNCTION_CLASS_NAME());
+    }
+    let typeOfS = isJsArray(s) ? getIndex(s, 0) : s;
+    let typeOfT = isJsArray(t) ? getIndex(t, 0) : t;
+    let name = runtimeTypeToString(typeOfT);
+    let substitution = null;
+    if (isNotIdentical(typeOfT, typeOfS)) {
+      let test = `${_foreign_helper.JS_OPERATOR_IS_PREFIX()}${name}`;
+      let typeOfSPrototype = _foreign_helper.JS('', '#.prototype', typeOfS);
+      if (hasNoField(typeOfSPrototype, test))
+        return false;
+      let field = `${_foreign_helper.JS_OPERATOR_AS_PREFIX()}${runtimeTypeToString(typeOfT)}`;
+      substitution = getField(typeOfSPrototype, field);
+    }
+    if (dart.notNull(dart.notNull(!dart.notNull(isJsArray(s))) && dart.notNull(substitution === null)) || dart.notNull(!dart.notNull(isJsArray(t)))) {
+      return true;
+    }
+    return checkArguments(substitution, getArguments(s), getArguments(t));
+  }
+  // Function isAssignable: (dynamic, dynamic) → bool
+  function isAssignable(s, t) {
+    return dart.notNull(isSubtype(s, t)) || dart.notNull(isSubtype(t, s));
+  }
+  // Function areAssignable: (List<dynamic>, List, bool) → bool
+  function areAssignable(s, t, allowShorter) {
+    if (dart.notNull(t === null) && dart.notNull(s === null))
+      return true;
+    if (t === null)
+      return allowShorter;
+    if (s === null)
+      return false;
+    dart.assert(isJsArray(s));
+    dart.assert(isJsArray(t));
+    let sLength = getLength(s);
+    let tLength = getLength(t);
+    if (allowShorter) {
+      if (sLength < tLength)
+        return false;
+    } else {
+      if (sLength !== tLength)
+        return false;
+    }
+    for (let i = 0; i < tLength; i++) {
+      if (!dart.notNull(isAssignable(getIndex(s, i), getIndex(t, i)))) {
+        return false;
+      }
+    }
+    return true;
+  }
+  // Function areAssignableMaps: (dynamic, dynamic) → bool
+  function areAssignableMaps(s, t) {
+    if (t === null)
+      return true;
+    if (s === null)
+      return false;
+    dart.assert(isJsObject(s));
+    dart.assert(isJsObject(t));
+    let names = _interceptors.JSArray.markFixedList(dart.as(_foreign_helper.JS('', 'Object.getOwnPropertyNames(#)', t), core.List));
+    for (let i = 0; i < names.length; i++) {
+      let name = names.get(i);
+      if (_foreign_helper.JS('bool', '!Object.hasOwnProperty.call(#, #)', s, name)) {
+        return false;
+      }
+      let tType = _foreign_helper.JS('', '#[#]', t, name);
+      let sType = _foreign_helper.JS('', '#[#]', s, name);
+      if (!dart.notNull(isAssignable(tType, sType)))
+        return false;
+    }
+    return true;
+  }
+  // Function isFunctionSubtype: (dynamic, dynamic) → bool
+  function isFunctionSubtype(s, t) {
+    dart.assert(hasField(t, `${_foreign_helper.JS_FUNCTION_TYPE_TAG()}`));
+    if (hasNoField(s, `${_foreign_helper.JS_FUNCTION_TYPE_TAG()}`))
+      return false;
+    if (hasField(s, `${_foreign_helper.JS_FUNCTION_TYPE_VOID_RETURN_TAG()}`)) {
+      if (dart.dbinary(hasNoField(t, `${_foreign_helper.JS_FUNCTION_TYPE_VOID_RETURN_TAG()}`), '&&', hasField(t, `${_foreign_helper.JS_FUNCTION_TYPE_RETURN_TYPE_TAG()}`))) {
+        return false;
+      }
+    } else if (hasNoField(t, `${_foreign_helper.JS_FUNCTION_TYPE_VOID_RETURN_TAG()}`)) {
+      let sReturnType = getField(s, `${_foreign_helper.JS_FUNCTION_TYPE_RETURN_TYPE_TAG()}`);
+      let tReturnType = getField(t, `${_foreign_helper.JS_FUNCTION_TYPE_RETURN_TYPE_TAG()}`);
+      if (!dart.notNull(isAssignable(sReturnType, tReturnType)))
+        return false;
+    }
+    let sParameterTypes = getField(s, `${_foreign_helper.JS_FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG()}`);
+    let tParameterTypes = getField(t, `${_foreign_helper.JS_FUNCTION_TYPE_REQUIRED_PARAMETERS_TAG()}`);
+    let sOptionalParameterTypes = getField(s, `${_foreign_helper.JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG()}`);
+    let tOptionalParameterTypes = getField(t, `${_foreign_helper.JS_FUNCTION_TYPE_OPTIONAL_PARAMETERS_TAG()}`);
+    let sParametersLen = sParameterTypes !== null ? getLength(sParameterTypes) : 0;
+    let tParametersLen = tParameterTypes !== null ? getLength(tParameterTypes) : 0;
+    let sOptionalParametersLen = sOptionalParameterTypes !== null ? getLength(sOptionalParameterTypes) : 0;
+    let tOptionalParametersLen = tOptionalParameterTypes !== null ? getLength(tOptionalParameterTypes) : 0;
+    if (sParametersLen > tParametersLen) {
+      return false;
+    }
+    if (sParametersLen + sOptionalParametersLen < tParametersLen + tOptionalParametersLen) {
+      return false;
+    }
+    if (sParametersLen === tParametersLen) {
+      if (!dart.notNull(areAssignable(dart.as(sParameterTypes, core.List), dart.as(tParameterTypes, core.List), false)))
+        return false;
+      if (!dart.notNull(areAssignable(dart.as(sOptionalParameterTypes, core.List), dart.as(tOptionalParameterTypes, core.List), true))) {
+        return false;
+      }
+    } else {
+      let pos = 0;
+      for (; pos < sParametersLen; pos++) {
+        if (!dart.notNull(isAssignable(getIndex(sParameterTypes, pos), getIndex(tParameterTypes, pos)))) {
+          return false;
+        }
+      }
+      let sPos = 0;
+      let tPos = pos;
+      for (; tPos < tParametersLen; sPos++, tPos++) {
+        if (!dart.notNull(isAssignable(getIndex(sOptionalParameterTypes, sPos), getIndex(tParameterTypes, tPos)))) {
+          return false;
+        }
+      }
+      tPos = 0;
+      for (; tPos < tOptionalParametersLen; sPos++, tPos++) {
+        if (!dart.notNull(isAssignable(getIndex(sOptionalParameterTypes, sPos), getIndex(tOptionalParameterTypes, tPos)))) {
+          return false;
+        }
+      }
+    }
+    let sNamedParameters = getField(s, `${_foreign_helper.JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG()}`);
+    let tNamedParameters = getField(t, `${_foreign_helper.JS_FUNCTION_TYPE_NAMED_PARAMETERS_TAG()}`);
+    return areAssignableMaps(sNamedParameters, tNamedParameters);
+  }
+  // Function invoke: (dynamic, dynamic) → dynamic
+  function invoke(function, arguments) {
+    return invokeOn(function, null, arguments);
+  }
+  // Function invokeOn: (dynamic, dynamic, dynamic) → Object
+  function invokeOn(function, receiver, arguments) {
+    dart.assert(isJsFunction(function));
+    dart.assert(dart.notNull(arguments === null) || dart.notNull(isJsArray(arguments)));
+    return _foreign_helper.JS('var', '#.apply(#, #)', function, receiver, arguments);
+  }
+  // Function call: (dynamic, String) → dynamic
+  function call(object, name) {
+    return _foreign_helper.JS('var', '#[#]()', object, name);
+  }
+  // Function getField: (dynamic, String) → dynamic
+  function getField(object, name) {
+    return _foreign_helper.JS('var', '#[#]', object, name);
+  }
+  // Function getIndex: (dynamic, int) → dynamic
+  function getIndex(array, index) {
+    dart.assert(isJsArray(array));
+    return _foreign_helper.JS('var', '#[#]', array, index);
+  }
+  // Function getLength: (dynamic) → int
+  function getLength(array) {
+    dart.assert(isJsArray(array));
+    return dart.as(_foreign_helper.JS('int', '#.length', array), core.int);
+  }
+  // Function isJsArray: (dynamic) → bool
+  function isJsArray(value) {
+    return dart.is(value, _interceptors.JSArray);
+  }
+  // Function hasField: (dynamic, dynamic) → dynamic
+  function hasField(object, name) {
+    return _foreign_helper.JS('bool', '# in #', name, object);
+  }
+  // Function hasNoField: (dynamic, dynamic) → dynamic
+  function hasNoField(object, name) {
+    return dart.throw_("Unimplemented PrefixExpression: !hasField(object, name)");
+  }
+  // Function isJsFunction: (dynamic) → bool
+  function isJsFunction(o) {
+    return dart.as(_foreign_helper.JS('bool', 'typeof # == "function"', o), core.bool);
+  }
+  // Function isJsObject: (dynamic) → bool
+  function isJsObject(o) {
+    return dart.as(_foreign_helper.JS('bool', "typeof # == 'object'", o), core.bool);
+  }
+  // Function isIdentical: (dynamic, dynamic) → bool
+  function isIdentical(s, t) {
+    return dart.as(_foreign_helper.JS('bool', '# === #', s, t), core.bool);
+  }
+  // Function isNotIdentical: (dynamic, dynamic) → bool
+  function isNotIdentical(s, t) {
+    return dart.as(_foreign_helper.JS('bool', '# !== #', s, t), core.bool);
+  }
+  // Exports:
+  _js_helper.patch = patch;
+  _js_helper.InternalMap = InternalMap;
+  _js_helper.requiresPreamble = requiresPreamble;
+  _js_helper.isJsIndexable = isJsIndexable;
+  _js_helper.S = S;
+  _js_helper.createInvocationMirror = createInvocationMirror;
+  _js_helper.createUnmangledInvocationMirror = createUnmangledInvocationMirror;
+  _js_helper.throwInvalidReflectionError = throwInvalidReflectionError;
+  _js_helper.traceHelper = traceHelper;
+  _js_helper.JSInvocationMirror = JSInvocationMirror;
+  _js_helper.CachedInvocation = CachedInvocation;
+  _js_helper.CachedCatchAllInvocation = CachedCatchAllInvocation;
+  _js_helper.CachedNoSuchMethodInvocation = CachedNoSuchMethodInvocation;
+  _js_helper.ReflectionInfo = ReflectionInfo;
+  _js_helper.getMetadata = getMetadata;
+  _js_helper.Primitives = Primitives;
+  _js_helper.JsCache = JsCache;
+  _js_helper.iae = iae;
+  _js_helper.ioore = ioore;
+  _js_helper.stringLastIndexOfUnchecked = stringLastIndexOfUnchecked;
+  _js_helper.checkNull = checkNull;
+  _js_helper.checkNum = checkNum;
+  _js_helper.checkInt = checkInt;
+  _js_helper.checkBool = checkBool;
+  _js_helper.checkString = checkString;
+  _js_helper.wrapException = wrapException;
+  _js_helper.toStringWrapper = toStringWrapper;
+  _js_helper.throwExpression = throwExpression;
+  _js_helper.makeLiteralListConst = makeLiteralListConst;
+  _js_helper.throwRuntimeError = throwRuntimeError;
+  _js_helper.throwAbstractClassInstantiationError = throwAbstractClassInstantiationError;
+  _js_helper.TypeErrorDecoder = TypeErrorDecoder;
+  _js_helper.NullError = NullError;
+  _js_helper.JsNoSuchMethodError = JsNoSuchMethodError;
+  _js_helper.UnknownJsTypeError = UnknownJsTypeError;
+  _js_helper.unwrapException = unwrapException;
+  _js_helper.getTraceFromException = getTraceFromException;
+  _js_helper.objectHashCode = objectHashCode;
+  _js_helper.fillLiteralMap = fillLiteralMap;
+  _js_helper.invokeClosure = invokeClosure;
+  _js_helper.convertDartClosureToJS = convertDartClosureToJS;
+  _js_helper.Closure = Closure;
+  _js_helper.closureFromTearOff = closureFromTearOff;
+  _js_helper.TearOffClosure = TearOffClosure;
+  _js_helper.BoundClosure = BoundClosure;
+  _js_helper.jsHasOwnProperty = jsHasOwnProperty;
+  _js_helper.jsPropertyAccess = jsPropertyAccess;
+  _js_helper.getFallThroughError = getFallThroughError;
+  _js_helper.Creates = Creates;
+  _js_helper.Returns = Returns;
+  _js_helper.JSName = JSName;
+  _js_helper.boolConversionCheck = boolConversionCheck;
+  _js_helper.stringTypeCheck = stringTypeCheck;
+  _js_helper.stringTypeCast = stringTypeCast;
+  _js_helper.doubleTypeCheck = doubleTypeCheck;
+  _js_helper.doubleTypeCast = doubleTypeCast;
+  _js_helper.numTypeCheck = numTypeCheck;
+  _js_helper.numTypeCast = numTypeCast;
+  _js_helper.boolTypeCheck = boolTypeCheck;
+  _js_helper.boolTypeCast = boolTypeCast;
+  _js_helper.intTypeCheck = intTypeCheck;
+  _js_helper.intTypeCast = intTypeCast;
+  _js_helper.propertyTypeError = propertyTypeError;
+  _js_helper.propertyTypeCastError = propertyTypeCastError;
+  _js_helper.propertyTypeCheck = propertyTypeCheck;
+  _js_helper.propertyTypeCast = propertyTypeCast;
+  _js_helper.interceptedTypeCheck = interceptedTypeCheck;
+  _js_helper.interceptedTypeCast = interceptedTypeCast;
+  _js_helper.numberOrStringSuperTypeCheck = numberOrStringSuperTypeCheck;
+  _js_helper.numberOrStringSuperTypeCast = numberOrStringSuperTypeCast;
+  _js_helper.numberOrStringSuperNativeTypeCheck = numberOrStringSuperNativeTypeCheck;
+  _js_helper.numberOrStringSuperNativeTypeCast = numberOrStringSuperNativeTypeCast;
+  _js_helper.stringSuperTypeCheck = stringSuperTypeCheck;
+  _js_helper.stringSuperTypeCast = stringSuperTypeCast;
+  _js_helper.stringSuperNativeTypeCheck = stringSuperNativeTypeCheck;
+  _js_helper.stringSuperNativeTypeCast = stringSuperNativeTypeCast;
+  _js_helper.listTypeCheck = listTypeCheck;
+  _js_helper.listTypeCast = listTypeCast;
+  _js_helper.listSuperTypeCheck = listSuperTypeCheck;
+  _js_helper.listSuperTypeCast = listSuperTypeCast;
+  _js_helper.listSuperNativeTypeCheck = listSuperNativeTypeCheck;
+  _js_helper.listSuperNativeTypeCast = listSuperNativeTypeCast;
+  _js_helper.voidTypeCheck = voidTypeCheck;
+  _js_helper.checkMalformedType = checkMalformedType;
+  _js_helper.checkDeferredIsLoaded = checkDeferredIsLoaded;
+  _js_helper.JavaScriptIndexingBehavior = JavaScriptIndexingBehavior;
+  _js_helper.TypeErrorImplementation = TypeErrorImplementation;
+  _js_helper.CastErrorImplementation = CastErrorImplementation;
+  _js_helper.FallThroughErrorImplementation = FallThroughErrorImplementation;
+  _js_helper.assertHelper = assertHelper;
+  _js_helper.throwNoSuchMethod = throwNoSuchMethod;
+  _js_helper.throwCyclicInit = throwCyclicInit;
+  _js_helper.RuntimeError = RuntimeError;
+  _js_helper.DeferredNotLoadedError = DeferredNotLoadedError;
+  _js_helper.RuntimeType = RuntimeType;
+  _js_helper.RuntimeFunctionType = RuntimeFunctionType;
+  _js_helper.buildFunctionType = buildFunctionType;
+  _js_helper.buildNamedFunctionType = buildNamedFunctionType;
+  _js_helper.buildInterfaceType = buildInterfaceType;
+  _js_helper.DynamicRuntimeType = DynamicRuntimeType;
+  _js_helper.getDynamicRuntimeType = getDynamicRuntimeType;
+  _js_helper.VoidRuntimeType = VoidRuntimeType;
+  _js_helper.getVoidRuntimeType = getVoidRuntimeType;
+  _js_helper.functionTypeTestMetaHelper = functionTypeTestMetaHelper;
+  _js_helper.convertRtiToRuntimeType = convertRtiToRuntimeType;
+  _js_helper.RuntimeTypePlain = RuntimeTypePlain;
+  _js_helper.RuntimeTypeGeneric = RuntimeTypeGeneric;
+  _js_helper.FunctionTypeInfoDecoderRing = FunctionTypeInfoDecoderRing;
+  _js_helper.UnimplementedNoSuchMethodError = UnimplementedNoSuchMethodError;
+  _js_helper.random64 = random64;
+  _js_helper.jsonEncodeNative = jsonEncodeNative;
+  _js_helper.getIsolateAffinityTag = getIsolateAffinityTag;
+  _js_helper.loadDeferredLibrary = loadDeferredLibrary;
+  _js_helper.MainError = MainError;
+  _js_helper.missingMain = missingMain;
+  _js_helper.badMain = badMain;
+  _js_helper.mainHasTooManyParameters = mainHasTooManyParameters;
+  _js_helper.NoSideEffects = NoSideEffects;
+  _js_helper.NoThrows = NoThrows;
+  _js_helper.NoInline = NoInline;
+  _js_helper.IrRepresentation = IrRepresentation;
+  _js_helper.Native = Native;
+  _js_helper.ConstantMap = ConstantMap;
+  _js_helper.ConstantMap$ = ConstantMap$;
+  _js_helper.ConstantStringMap = ConstantStringMap;
+  _js_helper.ConstantStringMap$ = ConstantStringMap$;
+  _js_helper.ConstantProtoMap = ConstantProtoMap;
+  _js_helper.ConstantProtoMap$ = ConstantProtoMap$;
+  _js_helper.GeneralConstantMap = GeneralConstantMap;
+  _js_helper.GeneralConstantMap$ = GeneralConstantMap$;
+  _js_helper.contains = contains;
+  _js_helper.arrayLength = arrayLength;
+  _js_helper.arrayGet = arrayGet;
+  _js_helper.arraySet = arraySet;
+  _js_helper.propertyGet = propertyGet;
+  _js_helper.callHasOwnProperty = callHasOwnProperty;
+  _js_helper.propertySet = propertySet;
+  _js_helper.getPropertyFromPrototype = getPropertyFromPrototype;
+  _js_helper.toStringForNativeObject = toStringForNativeObject;
+  _js_helper.hashCodeForNativeObject = hashCodeForNativeObject;
+  _js_helper.defineProperty = defineProperty;
+  _js_helper.isDartObject = isDartObject;
+  _js_helper.interceptorsByTag = interceptorsByTag;
+  _js_helper.leafTags = leafTags;
+  _js_helper.findDispatchTagForInterceptorClass = findDispatchTagForInterceptorClass;
+  _js_helper.lookupInterceptor = lookupInterceptor;
+  _js_helper.UNCACHED_MARK = UNCACHED_MARK;
+  _js_helper.INSTANCE_CACHED_MARK = INSTANCE_CACHED_MARK;
+  _js_helper.LEAF_MARK = LEAF_MARK;
+  _js_helper.INTERIOR_MARK = INTERIOR_MARK;
+  _js_helper.DISCRIMINATED_MARK = DISCRIMINATED_MARK;
+  _js_helper.lookupAndCacheInterceptor = lookupAndCacheInterceptor;
+  _js_helper.patchInstance = patchInstance;
+  _js_helper.patchProto = patchProto;
+  _js_helper.patchInteriorProto = patchInteriorProto;
+  _js_helper.makeLeafDispatchRecord = makeLeafDispatchRecord;
+  _js_helper.makeDefaultDispatchRecord = makeDefaultDispatchRecord;
+  _js_helper.setNativeSubclassDispatchRecord = setNativeSubclassDispatchRecord;
+  _js_helper.constructorNameFallback = constructorNameFallback;
+  _js_helper.initNativeDispatch = initNativeDispatch;
+  _js_helper.initNativeDispatchContinue = initNativeDispatchContinue;
+  _js_helper.initHooks = initHooks;
+  _js_helper.applyHooksTransformer = applyHooksTransformer;
+  _js_helper.regExpGetNative = regExpGetNative;
+  _js_helper.regExpGetGlobalNative = regExpGetGlobalNative;
+  _js_helper.regExpCaptureCount = regExpCaptureCount;
+  _js_helper.JSSyntaxRegExp = JSSyntaxRegExp;
+  _js_helper.firstMatchAfter = firstMatchAfter;
+  _js_helper.StringMatch = StringMatch;
+  _js_helper.allMatchesInStringUnchecked = allMatchesInStringUnchecked;
+  _js_helper.stringContainsUnchecked = stringContainsUnchecked;
+  _js_helper.stringReplaceJS = stringReplaceJS;
+  _js_helper.stringReplaceFirstRE = stringReplaceFirstRE;
+  _js_helper.ESCAPE_REGEXP = ESCAPE_REGEXP;
+  _js_helper.stringReplaceAllUnchecked = stringReplaceAllUnchecked;
+  _js_helper.stringReplaceAllFuncUnchecked = stringReplaceAllFuncUnchecked;
+  _js_helper.stringReplaceAllEmptyFuncUnchecked = stringReplaceAllEmptyFuncUnchecked;
+  _js_helper.stringReplaceAllStringFuncUnchecked = stringReplaceAllStringFuncUnchecked;
+  _js_helper.stringReplaceFirstUnchecked = stringReplaceFirstUnchecked;
+  _js_helper.stringJoinUnchecked = stringJoinUnchecked;
+  _js_helper.createRuntimeType = createRuntimeType;
+  _js_helper.TypeImpl = TypeImpl;
+  _js_helper.TypeVariable = TypeVariable;
+  _js_helper.getMangledTypeName = getMangledTypeName;
+  _js_helper.setRuntimeTypeInfo = setRuntimeTypeInfo;
+  _js_helper.getRuntimeTypeInfo = getRuntimeTypeInfo;
+  _js_helper.getRuntimeTypeArguments = getRuntimeTypeArguments;
+  _js_helper.getRuntimeTypeArgument = getRuntimeTypeArgument;
+  _js_helper.getTypeArgumentByIndex = getTypeArgumentByIndex;
+  _js_helper.copyTypeArguments = copyTypeArguments;
+  _js_helper.getClassName = getClassName;
+  _js_helper.getRuntimeTypeAsString = getRuntimeTypeAsString;
+  _js_helper.getConstructorName = getConstructorName;
+  _js_helper.runtimeTypeToString = runtimeTypeToString;
+  _js_helper.joinArguments = joinArguments;
+  _js_helper.getRuntimeTypeString = getRuntimeTypeString;
+  _js_helper.getRuntimeType = getRuntimeType;
+  _js_helper.substitute = substitute;
+  _js_helper.checkSubtype = checkSubtype;
+  _js_helper.computeTypeName = computeTypeName;
+  _js_helper.subtypeCast = subtypeCast;
+  _js_helper.assertSubtype = assertSubtype;
+  _js_helper.assertIsSubtype = assertIsSubtype;
+  _js_helper.throwTypeError = throwTypeError;
+  _js_helper.checkArguments = checkArguments;
+  _js_helper.areSubtypes = areSubtypes;
+  _js_helper.computeSignature = computeSignature;
+  _js_helper.isSupertypeOfNull = isSupertypeOfNull;
+  _js_helper.checkSubtypeOfRuntimeType = checkSubtypeOfRuntimeType;
+  _js_helper.subtypeOfRuntimeTypeCast = subtypeOfRuntimeTypeCast;
+  _js_helper.assertSubtypeOfRuntimeType = assertSubtypeOfRuntimeType;
+  _js_helper.getArguments = getArguments;
+  _js_helper.isSubtype = isSubtype;
+  _js_helper.isAssignable = isAssignable;
+  _js_helper.areAssignable = areAssignable;
+  _js_helper.areAssignableMaps = areAssignableMaps;
+  _js_helper.isFunctionSubtype = isFunctionSubtype;
+  _js_helper.invoke = invoke;
+  _js_helper.invokeOn = invokeOn;
+  _js_helper.call = call;
+  _js_helper.getField = getField;
+  _js_helper.getIndex = getIndex;
+  _js_helper.getLength = getLength;
+  _js_helper.isJsArray = isJsArray;
+  _js_helper.hasField = hasField;
+  _js_helper.hasNoField = hasNoField;
+  _js_helper.isJsFunction = isJsFunction;
+  _js_helper.isJsObject = isJsObject;
+  _js_helper.isIdentical = isIdentical;
+  _js_helper.isNotIdentical = isNotIdentical;
+})(_js_helper || (_js_helper = {}));