diff --git a/pkg/dev_compiler/.travis.yml b/pkg/dev_compiler/.travis.yml
index bf3ba7fdead2..ff2f86de42f8 100644
--- a/pkg/dev_compiler/.travis.yml
+++ b/pkg/dev_compiler/.travis.yml
@@ -14,6 +14,7 @@ before_install:
   - export DISPLAY=:99.0
   - sh -e /etc/init.d/xvfb start
 before_script:
+  - nvm install 5.5.0
   - npm install
 script:
   - ./tool/presubmit.sh && ./tool/coverage.sh
diff --git a/pkg/dev_compiler/lib/runtime/dart/_debugger.js b/pkg/dev_compiler/lib/runtime/dart/_debugger.js
index 4e541ef64a5d..972dfb559825 100644
--- a/pkg/dev_compiler/lib/runtime/dart/_debugger.js
+++ b/pkg/dev_compiler/lib/runtime/dart/_debugger.js
@@ -13,14 +13,14 @@ dart_library.library('dart/_debugger', null, /* Imports */[
     },
     set _devtoolsFormatter(_) {}
   });
-  function typeof$(object) {
+  function _typeof(object) {
     return typeof object;
   }
-  dart.fn(typeof$, core.String, [dart.dynamic]);
-  function instanceof$(object, clazz) {
+  dart.fn(_typeof, core.String, [dart.dynamic]);
+  function _instanceof(object, clazz) {
     return object instanceof clazz;
   }
-  dart.fn(instanceof$, core.bool, [dart.dynamic, dart.dynamic]);
+  dart.fn(_instanceof, core.bool, [dart.dynamic, dart.dynamic]);
   function getOwnPropertyNames(object) {
     return dart.as(dart.list(Object.getOwnPropertyNames(object), core.String), core.List$(core.String));
   }
@@ -45,14 +45,14 @@ dart_library.library('dart/_debugger', null, /* Imports */[
     names: ['getProperty', 'setProperty']
   });
   function isRegularDartObject(object) {
-    if (typeof$(object) == 'function') return false;
-    return instanceof$(object, core.Object);
+    if (_typeof(object) == 'function') return false;
+    return _instanceof(object, core.Object);
   }
   dart.fn(isRegularDartObject, core.bool, [dart.dynamic]);
   function getObjectTypeName(object) {
     let realRuntimeType = dart.realRuntimeType(object);
     if (realRuntimeType == null) {
-      if (typeof$(object) == 'function') {
+      if (_typeof(object) == 'function') {
         return '[[Raw JavaScript Function]]';
       }
       return '<Error getting type name>';
@@ -217,7 +217,7 @@ dart_library.library('dart/_debugger', null, /* Imports */[
         let nameSpan = new JsonMLElement('span');
         nameSpan.createTextChild(child.name != null ? dart.notNull(child.name) + ': ' : '');
         nameSpan.setStyle('color: rgb(136, 19, 145);');
-        if (typeof$(child.value) == 'object' || typeof$(child.value) == 'function') {
+        if (_typeof(child.value) == 'object' || _typeof(child.value) == 'function') {
           nameSpan.addStyle("padding-left: 13px;");
           li.appendChild(nameSpan);
           let objectTag = li.createObjectTag(child.value);
@@ -354,7 +354,7 @@ dart_library.library('dart/_debugger', null, /* Imports */[
   });
   class FunctionFormatter extends Formatter {
     accept(object) {
-      if (typeof$(object) != 'function') return false;
+      if (_typeof(object) != 'function') return false;
       return dart.realRuntimeType(object) != null;
     }
     hasChildren(object) {
@@ -537,8 +537,6 @@ dart_library.library('dart/_debugger', null, /* Imports */[
   dart.fn(registerDevtoolsFormatter);
   // Exports:
   exports.skipDartConfig = skipDartConfig;
-  exports.typeof = typeof$;
-  exports.instanceof = instanceof$;
   exports.getOwnPropertyNames = getOwnPropertyNames;
   exports.getOwnPropertySymbols = getOwnPropertySymbols;
   exports.JSNative = JSNative;
diff --git a/pkg/dev_compiler/lib/runtime/dart/_js_mirrors.js b/pkg/dev_compiler/lib/runtime/dart/_js_mirrors.js
index cc0d71f2d718..092a56acf2f9 100644
--- a/pkg/dev_compiler/lib/runtime/dart/_js_mirrors.js
+++ b/pkg/dev_compiler/lib/runtime/dart/_js_mirrors.js
@@ -29,7 +29,6 @@ dart_library.library('dart/_js_mirrors', null, /* Imports */[
   }
   dart.fn(reflectType, mirrors.TypeMirror, [core.Type]);
   const _dart = dart;
-  const _metadata = _dart.metadata;
   function _dload(obj, name) {
     return _dart.dload(obj, name);
   }
@@ -96,12 +95,12 @@ dart_library.library('dart/_js_mirrors', null, /* Imports */[
       [_toJsMap]: [dart.dynamic, [core.Map$(core.Symbol, dart.dynamic)]]
     })
   });
-  const _metadata$ = Symbol('_metadata');
+  const _metadata = Symbol('_metadata');
   const _declarations = Symbol('_declarations');
   const _cls = Symbol('_cls');
   class JsClassMirror extends core.Object {
     get metadata() {
-      return this[_metadata$];
+      return this[_metadata];
     }
     get declarations() {
       return this[_declarations];
@@ -109,10 +108,10 @@ dart_library.library('dart/_js_mirrors', null, /* Imports */[
     _(cls) {
       this[_cls] = cls;
       this.simpleName = core.Symbol.new(cls.name);
-      this[_metadata$] = null;
+      this[_metadata] = null;
       this[_declarations] = null;
       let fn = this[_cls][dart.metadata];
-      this[_metadata$] = fn == null ? dart.list([], mirrors.InstanceMirror) : core.List$(mirrors.InstanceMirror).from(dart.as(dart.dsend(dart.dcall(fn), 'map', dart.fn(i => new JsInstanceMirror._(i), JsInstanceMirror, [dart.dynamic])), core.Iterable));
+      this[_metadata] = fn == null ? dart.list([], mirrors.InstanceMirror) : core.List$(mirrors.InstanceMirror).from(dart.as(dart.dsend(dart.dcall(fn), 'map', dart.fn(i => new JsInstanceMirror._(i), JsInstanceMirror, [dart.dynamic])), core.Iterable));
       this[_declarations] = core.Map$(core.Symbol, mirrors.MethodMirror).new();
       this[_declarations].set(this.simpleName, new JsMethodMirror._(this, this[_cls]));
     }
diff --git a/pkg/dev_compiler/lib/runtime/dart/_runtime.js b/pkg/dev_compiler/lib/runtime/dart/_runtime.js
index 97e39946de2d..2632bc822e98 100644
--- a/pkg/dev_compiler/lib/runtime/dart/_runtime.js
+++ b/pkg/dev_compiler/lib/runtime/dart/_runtime.js
@@ -5,7 +5,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   'dart/_js_helper',
   'dart/async',
   'dart/collection'
-], function(exports, core, _interceptors, _js_helper, async$, collection) {
+], function(exports, core, _interceptors, _js_helper, async, collection) {
   'use strict';
   function mixin(base, ...mixins) {
     class Mixin extends base {
@@ -38,7 +38,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return clazz[_mixins];
   }
   function getImplements(clazz) {
-    return clazz[implements$];
+    return clazz[implements_];
   }
   const _typeArguments = Symbol("typeArguments");
   const _originalDeclaration = Symbol("originalDeclaration");
@@ -53,7 +53,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
         throwInternalError('requires ' + length + ' or 0 type arguments');
       }
       while (args.length < length)
-        args.push(dynamic);
+        args.push(dynamicR);
       let value = resultMap;
       for (let i = 0; i < length; i++) {
         let arg = args[i];
@@ -111,7 +111,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     if (f === void 0) f = obj[name];
     f = f.bind(obj);
     let sig = getMethodType(obj, name);
-    assert(sig);
+    assert_(sig);
     tag(f, sig);
     return f;
   }
@@ -185,7 +185,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   function registerExtension(jsType, dartExtType) {
     let extProto = dartExtType.prototype;
     let jsProto = jsType.prototype;
-    assert(jsProto[_extensionType] === void 0);
+    assert_(jsProto[_extensionType] === void 0);
     jsProto[_extensionType] = extProto;
     let dartObjProto = core.Object.prototype;
     while (extProto !== dartObjProto && extProto !== jsProto) {
@@ -193,7 +193,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
       extProto = extProto.__proto__;
     }
     let originalSigFn = getOwnPropertyDescriptor(dartExtType, _methodSig).get;
-    assert(originalSigFn);
+    assert_(originalSigFn);
     defineMemoizedGetter(jsType, _methodSig, originalSigFn);
   }
   function defineExtensionMembers(type, methodNames) {
@@ -229,13 +229,13 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     derived.prototype.__proto__ = base.prototype;
   }
   function throwCastError(actual, type) {
-    throw$(new _js_helper.CastErrorImplementation(actual, type));
+    throw_(new _js_helper.CastErrorImplementation(actual, type));
   }
   function throwAssertionError() {
-    throw$(new core.AssertionError());
+    throw_(new core.AssertionError());
   }
   function throwNullValueError() {
-    throw$(new core.NoSuchMethodError(null, new core.Symbol('<Unexpected Null Value>'), null, null, null));
+    throw_(new core.NoSuchMethodError(null, new core.Symbol('<Unexpected Null Value>'), null, null, null));
   }
   const _jsIterator = Symbol("_jsIterator");
   const _current = Symbol("_current");
@@ -243,7 +243,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     const SyncIterable_E = getGenericClass(_js_helper.SyncIterable)(E);
     return new SyncIterable_E(gen, args);
   }
-  function async(gen, T, ...args) {
+  function async_(gen, T, ...args) {
     let iter;
     function onValue(res) {
       if (res === void 0) res = null;
@@ -255,12 +255,12 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     function next(ret) {
       if (ret.done) return ret.value;
       let future = ret.value;
-      if (!instanceOf(future, getGenericClass(async$.Future))) {
-        future = async$.Future.value(future);
+      if (!instanceOf(future, getGenericClass(async.Future))) {
+        future = async.Future.value(future);
       }
       return future.then(onValue, {onError: onError});
     }
-    return getGenericClass(async$.Future)(T).new(function() {
+    return getGenericClass(async.Future)(T).new(function() {
       iter = gen(...args)[Symbol.iterator]();
       return onValue();
     });
@@ -273,7 +273,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
       this.isSuspendedAtYield = false;
       this.canceler = null;
       this.iterator = generator(this, ...args)[Symbol.iterator]();
-      this.controller = getGenericClass(async$.StreamController)(T).new({
+      this.controller = getGenericClass(async.StreamController)(T).new({
         onListen: (() => this.scheduleGenerator()).bind(this),
         onResume: (() => this.onResume()).bind(this),
         onCancel: (() => this.onCancel()).bind(this)
@@ -289,7 +289,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
         return null;
       }
       if (this.canceler == null) {
-        this.canceler = async$.Completer.new();
+        this.canceler = async.Completer.new();
         this.scheduleGenerator();
       }
       return this.canceler.future;
@@ -305,7 +305,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
         return;
       }
       this.isScheduled = true;
-      async$.scheduleMicrotask((() => this.runBody()).bind(this));
+      async.scheduleMicrotask((() => this.runBody()).bind(this));
     }
     runBody(opt_awaitValue) {
       this.isScheduled = false;
@@ -327,8 +327,8 @@ dart_library.library('dart/_runtime', null, /* Imports */[
       if (this.isSuspendedAtYield || this.isAdding) return;
       this.isWaiting = true;
       let future = iter.value;
-      if (!instanceOf(future, getGenericClass(async$.Future))) {
-        future = async$.Future.value(future);
+      if (!instanceOf(future, getGenericClass(async.Future))) {
+        future = async.Future.value(future);
       }
       return future.then((x => this.runBody(x)).bind(this), {
         onError: ((e, s) => this.throwError(e, s)).bind(this)
@@ -419,7 +419,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return true;
   }
   function throwNoSuchMethod(obj, name, pArgs, nArgs, extras) {
-    throw$(new core.NoSuchMethodError(obj, name, pArgs, nArgs, extras));
+    throw_(new core.NoSuchMethodError(obj, name, pArgs, nArgs, extras));
   }
   function throwNoSuchMethodFunc(obj, name, pArgs, opt_func) {
     if (obj === void 0) obj = opt_func;
@@ -468,7 +468,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return value;
   }
   function _ignoreTypeFailure(actual, type) {
-    if (isSubtype(type, core.Iterable) && isSubtype(actual, core.Iterable) || isSubtype(type, async$.Future) && isSubtype(actual, async$.Future) || isSubtype(type, core.Map) && isSubtype(actual, core.Map) || isSubtype(type, core.Function) && isSubtype(actual, core.Function) || isSubtype(type, async$.Stream) && isSubtype(actual, async$.Stream) || isSubtype(type, async$.StreamSubscription) && isSubtype(actual, async$.StreamSubscription)) {
+    if (isSubtype(type, core.Iterable) && isSubtype(actual, core.Iterable) || isSubtype(type, async.Future) && isSubtype(actual, async.Future) || isSubtype(type, core.Map) && isSubtype(actual, core.Map) || isSubtype(type, core.Function) && isSubtype(actual, core.Function) || isSubtype(type, async.Stream) && isSubtype(actual, async.Stream) || isSubtype(type, async.StreamSubscription) && isSubtype(actual, async.StreamSubscription)) {
       console.warn('Ignoring cast fail from ' + typeName(actual) + ' to ' + typeName(type));
       return true;
     }
@@ -535,11 +535,11 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     }
     return map;
   }
-  function assert(condition) {
+  function assert_(condition) {
     if (!condition) throwAssertionError();
   }
   const _stack = new WeakMap();
-  function throw$(obj) {
+  function throw_(obj) {
     if (obj != null && (typeof obj == 'object' || typeof obj == 'function')) {
       _stack.set(obj, new Error());
     }
@@ -580,7 +580,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return value;
   }
   const constants = new Map();
-  function const$(obj) {
+  function const_(obj) {
     let objectKey = [realRuntimeType(obj)];
     for (let name of getOwnNamesAndSymbols(obj)) {
       objectKey.push(name);
@@ -642,7 +642,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     }
     let t;
     if (args.length == 0) {
-      t = definiteFunctionType(dynamic, Array(closure.length).fill(dynamic));
+      t = definiteFunctionType(dynamicR, Array(closure.length).fill(dynamicR));
     } else {
       t = definiteFunctionType.apply(null, args);
     }
@@ -682,7 +682,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return obj.runtimeType;
   }
   function getFunctionType(obj) {
-    let args = Array(obj.length).fill(dynamic);
+    let args = Array(obj.length).fill(dynamicR);
     return definiteFunctionType(bottom, args);
   }
   function realRuntimeType(obj) {
@@ -724,7 +724,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     tagComputed(value, getter);
   }
   const _mixins = Symbol("mixins");
-  const implements$ = Symbol("implements");
+  const implements_ = Symbol("implements");
   const metadata = Symbol("metadata");
   const TypeRep = class TypeRep extends LazyTagged(() => core.Type) {
     get name() {
@@ -736,13 +736,13 @@ dart_library.library('dart/_runtime', null, /* Imports */[
       return "dynamic";
     }
   };
-  const dynamic = new Dynamic();
+  const dynamicR = new Dynamic();
   const Void = class Void extends TypeRep {
     toString() {
       return "void";
     }
   };
-  const void$ = new Void();
+  const voidR = new Void();
   const Bottom = class Bottom extends TypeRep {
     toString() {
       return "bottom";
@@ -829,7 +829,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     _canonize() {
       if (this.definite) return;
       function replace(a) {
-        return a == dynamic ? bottom : a;
+        return a == dynamicR ? bottom : a;
       }
       this.args = this.args.map(replace);
       if (this.optionals.length > 0) {
@@ -935,7 +935,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     let ret1 = ft1.returnType;
     let ret2 = ft2.returnType;
     if (!isSubtype_(ret1, ret2)) {
-      if (ret2 != void$) {
+      if (ret2 != voidR) {
         return false;
       }
     }
@@ -1008,7 +1008,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     return type == bottom;
   }
   function _isTop(type) {
-    return type == core.Object || type == dynamic;
+    return type == core.Object || type == dynamicR;
   }
   function isSubtype_(t1, t2) {
     t1 = canonicalType(t1);
@@ -1030,10 +1030,10 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   }
   function isClassSubType(t1, t2) {
     t1 = canonicalType(t1);
-    assert(t2 == canonicalType(t2));
+    assert_(t2 == canonicalType(t2));
     if (t1 == t2) return true;
     if (t1 == core.Object) return false;
-    if (t1 == null) return t2 == core.Object || t2 == dynamic;
+    if (t1 == null) return t2 == core.Object || t2 == dynamicR;
     let raw1 = getGenericClass(t1);
     let raw2 = getGenericClass(t2);
     if (raw1 != null && raw1 == raw2) {
@@ -1045,7 +1045,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
       } else if (length == 0) {
         return false;
       }
-      assert(length == typeArguments2.length);
+      assert_(length == typeArguments2.length);
       for (let i = 0; i < length; ++i) {
         if (!isSubtype(typeArguments1[i], typeArguments2[i])) {
           return false;
@@ -1086,7 +1086,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
     let typeArgs = getGenericArgs(type);
     if (!typeArgs) return true;
     for (let t of typeArgs) {
-      if (t != core.Object && t != dynamic) return false;
+      if (t != core.Object && t != dynamicR) return false;
     }
     return true;
   }
@@ -1161,7 +1161,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   function copyProperties(to, from) {
     return copyTheseProperties(to, from, getOwnNamesAndSymbols(from));
   }
-  function export$(to, from, show, hide) {
+  function export_(to, from, show, hide) {
     if (show == void 0 || show.length == 0) {
       show = getOwnNamesAndSymbols(from);
     }
@@ -1174,9 +1174,9 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   const defineLazyClass = defineLazy;
   const defineLazyProperties = defineLazy;
   const defineLazyClassGeneric = defineLazyProperty;
-  const as = cast;
-  const is = instanceOf;
-  const global = typeof window == "undefined" ? global : window;
+  const as_ = cast;
+  const is_ = instanceOf;
+  const global_ = typeof window == "undefined" ? global : window;
   const JsSymbol = Symbol;
   // Exports:
   exports.mixin = mixin;
@@ -1205,7 +1205,7 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   exports.throwAssertionError = throwAssertionError;
   exports.throwNullValueError = throwNullValueError;
   exports.syncStar = syncStar;
-  exports.async = async;
+  exports.async = async_;
   exports.asyncStar = asyncStar;
   exports.dload = dload;
   exports.dput = dput;
@@ -1227,15 +1227,15 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   exports.equals = equals;
   exports.notNull = notNull;
   exports.map = map;
-  exports.assert = assert;
-  exports.throw = throw$;
+  exports.assert = assert_;
+  exports.throw = throw_;
   exports.getError = getError;
   exports.stackPrint = stackPrint;
   exports.stackTrace = stackTrace;
   exports.nullSafe = nullSafe;
   exports.multiKeyPutIfAbsent = multiKeyPutIfAbsent;
   exports.constants = constants;
-  exports.const = const$;
+  exports.const = const_;
   exports.hashCode = hashCode;
   exports.toString = toString;
   exports.noSuchMethod = noSuchMethod;
@@ -1250,13 +1250,13 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   exports.tag = tag;
   exports.tagComputed = tagComputed;
   exports.tagMemoized = tagMemoized;
-  exports.implements = implements$;
+  exports.implements = implements_;
   exports.metadata = metadata;
   exports.TypeRep = TypeRep;
   exports.Dynamic = Dynamic;
-  exports.dynamic = dynamic;
+  exports.dynamic = dynamicR;
   exports.Void = Void;
-  exports.void = void$;
+  exports.void = voidR;
   exports.Bottom = Bottom;
   exports.bottom = bottom;
   exports.JSObject = JSObject;
@@ -1292,12 +1292,12 @@ dart_library.library('dart/_runtime', null, /* Imports */[
   exports.defineMemoizedGetter = defineMemoizedGetter;
   exports.copyTheseProperties = copyTheseProperties;
   exports.copyProperties = copyProperties;
-  exports.export = export$;
+  exports.export = export_;
   exports.defineLazyClass = defineLazyClass;
   exports.defineLazyProperties = defineLazyProperties;
   exports.defineLazyClassGeneric = defineLazyClassGeneric;
-  exports.as = as;
-  exports.is = is;
-  exports.global = global;
+  exports.as = as_;
+  exports.is = is_;
+  exports.global = global_;
   exports.JsSymbol = JsSymbol;
 });
diff --git a/pkg/dev_compiler/lib/runtime/dart/html.js b/pkg/dev_compiler/lib/runtime/dart/html.js
index db449c15b49f..1495e6ebeadd 100644
--- a/pkg/dev_compiler/lib/runtime/dart/html.js
+++ b/pkg/dev_compiler/lib/runtime/dart/html.js
@@ -12427,7 +12427,7 @@ dart_library.library('dart/html', null, /* Imports */[
   Platform.supportsSimd = false;
   dart.defineLazyProperties(Platform, {
     get supportsTypedData() {
-      return !!window.ArrayBuffer;
+      return !!dart.global.ArrayBuffer;
     }
   });
   function _wrapZone(callback) {
@@ -12667,10 +12667,12 @@ dart_library.library('dart/html', null, /* Imports */[
       sanitizeNode: [dart.void, [Node, Node]]
     })
   });
-  dart.copyProperties(exports, {
+  dart.defineLazyProperties(exports, {
     get window() {
-      return dart.as(wrap_jso(window), Window);
-    },
+      return dart.as(wrap_jso(dart.global), Window);
+    }
+  });
+  dart.copyProperties(exports, {
     get document() {
       return dart.as(wrap_jso(document), HtmlDocument);
     }
diff --git a/pkg/dev_compiler/lib/src/codegen/js_codegen.dart b/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
index 4f8fb3772997..d35786f5ea79 100644
--- a/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
+++ b/pkg/dev_compiler/lib/src/codegen/js_codegen.dart
@@ -25,7 +25,8 @@ import '../js/js_ast.dart' as JS;
 import '../js/js_ast.dart' show js;
 
 import '../closure/closure_annotator.dart' show ClosureAnnotator;
-import '../compiler.dart' show AbstractCompiler;
+import '../compiler.dart'
+    show AbstractCompiler, corelibOrder, getCorelibModuleName;
 import '../info.dart';
 import '../options.dart' show CodegenOptions;
 import '../utils.dart';
@@ -81,7 +82,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
 
   /// Imported libraries, and the temporaries used to refer to them.
   final _imports = new Map<LibraryElement, JS.TemporaryId>();
-  final _exports = new Set<String>();
+  final _exports = <String, String>{};
   final _properties = <FunctionDeclaration>[];
   final _privateNames = new HashMap<String, JS.TemporaryId>();
   final _moduleItems = <JS.Statement>[];
@@ -184,6 +185,14 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
 
     var items = <JS.ModuleItem>[];
     if (!_isDartRuntime) {
+      if (currentLibrary.source.isInSystemLibrary) {
+        // Force the import order of runtime libs.
+        // TODO(ochafik): Reduce this to a minimum.
+        for (var lib in corelibOrder.reversed) {
+          // TODO(ochafik): Use uris instead in corelibOrder.
+          moduleBuilder.addImport(getCorelibModuleName(lib), null);
+        }
+      }
       moduleBuilder.addImport('dart/_runtime', _runtimeLibVar);
 
       var dartxImport =
@@ -264,7 +273,6 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
       args.add(new JS.ArrayInitializer(hiddenNames));
     }
 
-    // When we compile _runtime.js, we need to source export_ from _utils.js:
     _moduleItems.add(js.statement('dart.export(#);', [args]));
   }
 
@@ -538,7 +546,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
     var name = type.name;
     var genericName = '$name\$';
     var typeParams = _typeFormalsOf(type).map((p) => p.name);
-    if (isPublic(name)) _exports.add(genericName);
+    if (isPublic(name)) _addExport(genericName);
     return js.statement('const # = dart.generic(function(#) { #; return #; });',
         [genericName, typeParams, body, name]);
   }
@@ -1302,7 +1310,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
     var body = <JS.Statement>[];
     _flushLibraryProperties(body);
 
-    var name = _getJSExportName(node.element) ?? node.name.name;
+    var name = node.name.name;
 
     var fn = _visit(node.functionExpression);
 
@@ -1318,7 +1326,9 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
           .toStatement());
     }
 
-    if (isPublic(name)) _addExport(name);
+    if (isPublic(name)) {
+      _addExport(name, _getJSExportName(node.element) ?? name);
+    }
     return _statement(body);
   }
 
@@ -1751,7 +1761,6 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
 
   JS.Expression _emitTopLevelName(Element e, {String suffix: ''}) {
     var libName = _libraryName(e.library);
-    var nameExpr = _propertyName((_getJSExportName(e) ?? e.name) + suffix);
 
     // Always qualify:
     // * mutable top-level fields
@@ -1760,6 +1769,12 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
         !e.isConst &&
         !_isFinalJSDecl(e.computeNode());
     bool fromAnotherLibrary = e.library != currentLibrary;
+    var nameExpr;
+    if (fromAnotherLibrary) {
+      nameExpr = _propertyName((_getJSExportName(e) ?? e.name) + suffix);
+    } else {
+      nameExpr = _propertyName(e.name + suffix);
+    }
     if (mutableTopLevel || fromAnotherLibrary) {
       return new JS.PropertyAccess(libName, nameExpr);
     }
@@ -2137,8 +2152,26 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
     }
   }
 
-  _addExport(String name) {
-    if (!_exports.add(name)) throw 'Duplicate top level name found: $name';
+  /// Emits static fields.
+  ///
+  /// Instance fields are emitted in [_initializeFields].
+  ///
+  /// These are generally treated the same as top-level fields, see
+  /// [visitTopLevelVariableDeclaration].
+  @override
+  visitFieldDeclaration(FieldDeclaration node) {
+    if (!node.isStatic) return;
+
+    for (var f in node.fields.variables) {
+      _loader.loadDeclaration(f, f.element);
+    }
+  }
+
+  _addExport(String name, [String exportName]) {
+    if (_exports.containsKey(name)) {
+      throw 'Duplicate top level name found: $name';
+    }
+    _exports[name] = exportName ?? name;
   }
 
   @override
@@ -2247,12 +2280,18 @@ class JSCodegenVisitor extends GeneralizingAstVisitor with ClosureAnnotator {
     var isJSTopLevel = field.isFinal && _isFinalJSDecl(field);
     if (isJSTopLevel) eagerInit = true;
 
-    var fieldName = _getJSExportName(element) ?? field.name.name;
-    if (field.isConst && eagerInit || isJSTopLevel) {
+    var fieldName = field.name.name;
+    var exportName = fieldName;
+    if (element is TopLevelVariableElement) {
+      exportName = _getJSExportName(element) ?? fieldName;
+    }
+    if ((field.isConst && eagerInit && element is TopLevelVariableElement) ||
+        isJSTopLevel) {
       // constant fields don't change, so we can generate them as `let`
       // but add them to the module's exports. However, make sure we generate
       // anything they depend on first.
-      if (isPublic(fieldName)) _addExport(fieldName);
+
+      if (isPublic(fieldName)) _addExport(fieldName, exportName);
       var declKeyword = field.isConst || field.isFinal ? 'const' : 'let';
       return annotateVariable(
           js.statement(
diff --git a/pkg/dev_compiler/lib/src/codegen/module_builder.dart b/pkg/dev_compiler/lib/src/codegen/module_builder.dart
index 42d8367ae0aa..9128526a7dac 100644
--- a/pkg/dev_compiler/lib/src/codegen/module_builder.dart
+++ b/pkg/dev_compiler/lib/src/codegen/module_builder.dart
@@ -12,8 +12,8 @@ import '../options.dart' show ModuleFormat;
 
 /// Helper that builds JS modules in a given [ModuleFormat].
 abstract class ModuleBuilder {
-  final List<String> _exports = <String>[];
-  final List<_ModuleImport> _imports = <_ModuleImport>[];
+  final _exports = <String, String>{};
+  final _imports = <_ModuleImport>[];
 
   ModuleBuilder._();
 
@@ -30,17 +30,21 @@ abstract class ModuleBuilder {
         return new LegacyModuleBuilder();
       case ModuleFormat.es6:
         return new ES6ModuleBuilder();
+      case ModuleFormat.node:
+        return new NodeModuleBuilder();
     }
   }
 
   /// Adds [name] to the list of names to be exported from the module.
-  void addExport(String name) {
-    _exports.add(name);
+  void addExport(String name, String exportName) {
+    _exports[name] = exportName;
   }
 
   /// Adds an import from a module named [name] and locally aliased as [libVar].
-  /// When [isLazy] is true, the import should be lazy (i.e. there is some
+  /// When [isLazy] is `true`, the import should be lazy (i.e. there is some
   /// cyclic dependency of imports).
+  /// When [libVar] is `null`, the import is there just to force the import
+  /// order.
   void addImport(String name, JS.Identifier libVar, {bool isLazy: false}) {
     _imports.add(new _ModuleImport(name, libVar, isLazy));
   }
@@ -65,7 +69,7 @@ class LegacyModuleBuilder extends ModuleBuilder {
   LegacyModuleBuilder() : super._();
 
   JS.Program build(String jsPath, String jsModuleValue,
-      JS.Identifier exportsVar, List<JS.ModuleItem> moduleItems) {
+      JS.Identifier exportsVar, Iterable<JS.ModuleItem> moduleItems) {
     // TODO(jmesserly): it would be great to run the renamer on the body,
     // then figure out if we really need each of these parameters.
     // See ES6 modules: https://github.com/dart-lang/dev_compiler/issues/34
@@ -77,6 +81,8 @@ class LegacyModuleBuilder extends ModuleBuilder {
     var moduleStatements = <JS.Statement>[];
 
     for (var i in _imports) {
+      // No need to force the import order for the legacy library mechanism.
+      if (i.libVar == null) continue;
       (i.isLazy ? lazyImports : imports).add(js.string(i.name, "'"));
       (i.isLazy ? lazyParams : params).add(i.libVar);
     }
@@ -87,10 +93,10 @@ class LegacyModuleBuilder extends ModuleBuilder {
     if (_exports.isNotEmpty) {
       moduleStatements.add(js.comment('Exports:'));
       // TODO(jmesserly): make these immutable in JS?
-      for (var name in _exports) {
+      _exports.forEach((name, exportName) {
         moduleStatements
-            .add(js.statement('#.# = #;', [exportsVar, name, name]));
-      }
+            .add(js.statement('#.# = #;', [exportsVar, exportName, name]));
+      });
     }
 
     var module =
@@ -123,7 +129,6 @@ class ES6ModuleBuilder extends ModuleBuilder {
   JS.Program build(String jsPath, String jsModuleValue,
       JS.Identifier exportsVar, Iterable<JS.ModuleItem> moduleItems) {
     var moduleStatements = <JS.ModuleItem>[
-      // Lazy declarations may reference exports.
       js.statement("const # = {};", [exportsVar])
     ];
 
@@ -133,8 +138,13 @@ class ES6ModuleBuilder extends ModuleBuilder {
     for (var i in _imports) {
       var moduleName = js.string(_relativeModuleName(i.name, from: jsPath));
       // TODO(ochafik): laziness, late binding, etc, to support Closure...
-      moduleStatements.add(
-          new JS.ImportDeclaration(defaultBinding: i.libVar, from: moduleName));
+      if (i.libVar == null) {
+        moduleStatements
+            .add(new JS.ImportDeclaration(namedImports: [], from: moduleName));
+      } else {
+        moduleStatements.add(new JS.ImportDeclaration(
+            defaultBinding: i.libVar, from: moduleName));
+      }
     }
 
     moduleStatements.addAll(_flattenBlocks(moduleItems));
@@ -142,14 +152,46 @@ class ES6ModuleBuilder extends ModuleBuilder {
     if (_exports.isNotEmpty) {
       moduleStatements.add(js.comment('Exports:'));
       // TODO(jmesserly): make these immutable in JS?
-      for (var name in _exports) {
+      _exports.forEach((name, exportName) {
         moduleStatements
-            .add(js.statement('#.# = #;', [exportsVar, name, name]));
-      }
+            .add(js.statement('#.# = #;', [exportsVar, exportName, name]));
+      });
       moduleStatements
           .add(new JS.ExportDeclaration(exportsVar, isDefault: true));
     }
-    // TODO(ochafik): What to do of jsModuleValue?
+    // TODO(ochafik): What to do with jsModuleValue?
+    return new JS.Program(moduleStatements);
+  }
+}
+
+/// Generates node modules.
+class NodeModuleBuilder extends ModuleBuilder {
+  NodeModuleBuilder() : super._();
+
+  JS.Program build(String jsPath, String jsModuleValue,
+      JS.Identifier exportsVar, Iterable<JS.ModuleItem> moduleItems) {
+    var moduleStatements = <JS.ModuleItem>[js.statement("'use strict';"),];
+
+    for (var i in _imports) {
+      if (i.libVar == null) {
+        moduleStatements.add(js.statement('require(#);', [js.string(i.name)]));
+      } else {
+        moduleStatements.add(
+            js.statement('let # = require(#);', [i.libVar, js.string(i.name)]));
+      }
+    }
+
+    moduleStatements.addAll(_flattenBlocks(moduleItems));
+
+    if (_exports.isNotEmpty) {
+      moduleStatements.add(js.comment('Exports:'));
+      _exports.forEach((name, exportName) {
+        moduleStatements
+            .add(js.statement('#.# = #;', [exportsVar, exportName, name]));
+      });
+    }
+    // TODO(ochafik): What to do with jsModuleValue?
+    // (something like `let exports = jsModuleValue;`?)
     return new JS.Program(moduleStatements);
   }
 }
diff --git a/pkg/dev_compiler/lib/src/compiler.dart b/pkg/dev_compiler/lib/src/compiler.dart
index 61c568591624..921b857ae5ca 100644
--- a/pkg/dev_compiler/lib/src/compiler.dart
+++ b/pkg/dev_compiler/lib/src/compiler.dart
@@ -513,13 +513,27 @@ const corelibOrder = const [
   'dart._js_mirrors',
   'dart.js',
   'dart._metadata',
-  'dart.dom.html_common',
   'dart.dom.html',
+  'dart.dom.html_common',
   'dart._debugger'
   // _foreign_helper is not included, as it only defines the JS builtin that
   // the compiler handles at compile time.
 ];
 
+/// Returns the JS module name corresponding to a core library name (must be
+/// from the [corelibOrder] list).
+String getCorelibModuleName(String lib) {
+  assert(corelibOrder.contains(lib));
+  switch (lib) {
+    case 'dart.dom.html_common':
+      return 'dart/html_common';
+    case 'dart.dom.html':
+      return 'dart/html';
+    default:
+      return lib.replaceAll('dart.', 'dart/');
+  }
+}
+
 /// Runtime files added to all applications when running the compiler in the
 /// command line.
 final defaultRuntimeFiles = () {
diff --git a/pkg/dev_compiler/lib/src/options.dart b/pkg/dev_compiler/lib/src/options.dart
index d5abf8d2023e..2d132a48b46e 100644
--- a/pkg/dev_compiler/lib/src/options.dart
+++ b/pkg/dev_compiler/lib/src/options.dart
@@ -58,7 +58,7 @@ class SourceResolverOptions {
       this.useImplicitHtml: false});
 }
 
-enum ModuleFormat { es6, legacy }
+enum ModuleFormat { es6, legacy, node }
 ModuleFormat parseModuleFormat(String s) => parseEnum(s, ModuleFormat.values);
 
 // TODO(jmesserly): refactor all codegen options here.
@@ -315,7 +315,9 @@ final ArgParser argParser = new ArgParser()
       allowedHelp: {
         getEnumName(ModuleFormat.es6): 'es6 modules',
         getEnumName(ModuleFormat.legacy):
-            'a custom format used by dartdevc, similar to AMD'
+            'a custom format used by dartdevc, similar to AMD',
+        getEnumName(ModuleFormat.node):
+            'node.js modules (https://nodejs.org/api/modules.html)'
       },
       defaultsTo: getEnumName(ModuleFormat.legacy))
 
diff --git a/pkg/dev_compiler/test/browser/runtime_tests.js b/pkg/dev_compiler/test/browser/runtime_tests.js
index 8e7bd4157578..938e76253fc9 100644
--- a/pkg/dev_compiler/test/browser/runtime_tests.js
+++ b/pkg/dev_compiler/test/browser/runtime_tests.js
@@ -22,7 +22,7 @@ suite('generic', () => {
         new RegExp('NoSuchMethodError.*\nReceiver: 42', 'm'),
         'Calls with non-function receiver should throw a NoSuchMethodError' +
         ' with correct target');
-    
+
     // TODO(jmesserly): we should show the name "print" in there somewhere.
     assert.throws(() => dart.dcall(core.print, 1, 2, 3),
         new RegExp('NoSuchMethodError.*\n' +
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/equality.txt b/pkg/dev_compiler/test/codegen/expect/collection/equality.txt
index e8d1caa801e5..433fdd0c1991 100644
--- a/pkg/dev_compiler/test/codegen/expect/collection/equality.txt
+++ b/pkg/dev_compiler/test/codegen/expect/collection/equality.txt
@@ -1 +1,10 @@
 // Messages from compiling equality.dart
+severe: [AnalyzerMessage] The redirected constructor '() → DefaultEquality' has incompatible parameters with '() → Equality<E>' (package:collection/equality.dart, line 18, col 30)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<E> because const DefaultEquality() cannot be typed as Equality<E> (package:collection/equality.dart, line 75, col 31)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<E> because const DefaultEquality() cannot be typed as Equality<E> (package:collection/equality.dart, line 120, col 53)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<E> because const DefaultEquality() cannot be typed as Equality<E> (package:collection/equality.dart, line 205, col 38)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<E> because const DefaultEquality() cannot be typed as Equality<E> (package:collection/equality.dart, line 223, col 38)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<K> because const DefaultEquality() cannot be typed as Equality<K> (package:collection/equality.dart, line 263, col 42)
+severe: [STATIC_TYPE_ERROR] Type check failed: const DefaultEquality() (DefaultEquality) is not of type Equality<V> because const DefaultEquality() cannot be typed as Equality<V> (package:collection/equality.dart, line 264, col 44)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/equality.dart, line 87, col 36)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/equality.dart, line 87, col 49)
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.js b/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.js
index 03744bc169ca..3e1e9ab14bfe 100644
--- a/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.js
+++ b/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.js
@@ -32,12 +32,9 @@ dart_library.library('collection/src/canonicalized_map', null, /* Imports */[
         return pair == null ? null : pair.last;
       }
       set(key, value) {
-        (() => {
-          dart.as(key, K);
-          dart.as(value, V);
-          if (!dart.notNull(this[_isValidKey](key))) return;
-          this[_base].set(dart.as(dart.dcall(this[_canonicalize], key), C), new (utils.Pair$(K, V))(key, value));
-        })();
+        dart.as(key, K);
+        dart.as(value, V);
+        this[_base].set(dart.as(dart.dcall(this[_canonicalize], key), C), new (utils.Pair$(K, V))(key, value));
         return value;
       }
       addAll(other) {
@@ -65,7 +62,7 @@ dart_library.library('collection/src/canonicalized_map', null, /* Imports */[
         return this[_base].isNotEmpty;
       }
       get keys() {
-        return this[_base].values[dartx.map](dart.fn(pair => pair.first, K, [utils.Pair$(K, V)]));
+        return dart.as(this[_base].values[dartx.map](dart.fn(pair => pair.first, K, [utils.Pair$(K, V)])), core.Iterable$(K));
       }
       get length() {
         return this[_base].length;
@@ -81,7 +78,7 @@ dart_library.library('collection/src/canonicalized_map', null, /* Imports */[
         return pair == null ? null : pair.last;
       }
       get values() {
-        return this[_base].values[dartx.map](dart.fn(pair => pair.last, V, [utils.Pair$(K, V)]));
+        return dart.as(this[_base].values[dartx.map](dart.fn(pair => pair.last, V, [utils.Pair$(K, V)])), core.Iterable$(V));
       }
       toString() {
         return collection.Maps.mapToString(this);
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.txt b/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.txt
index 59bff0e185c1..b292e19bd8d1 100644
--- a/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.txt
+++ b/pkg/dev_compiler/test/codegen/expect/collection/src/canonicalized_map.txt
@@ -1,3 +1,5 @@
 // Messages from compiling canonicalized_map.dart
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to C (package:collection/src/canonicalized_map.dart, line 61, col 11)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to C (package:collection/src/canonicalized_map.dart, line 93, col 30)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to C (package:collection/src/canonicalized_map.dart, line 67, col 11)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<dynamic> to Iterable<K> (package:collection/src/canonicalized_map.dart, line 94, col 27)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to C (package:collection/src/canonicalized_map.dart, line 99, col 30)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<dynamic> to Iterable<V> (package:collection/src/canonicalized_map.dart, line 109, col 29)
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/src/queue_list.txt b/pkg/dev_compiler/test/codegen/expect/collection/src/queue_list.txt
index 02d24e699ebf..ab8828702105 100644
--- a/pkg/dev_compiler/test/codegen/expect/collection/src/queue_list.txt
+++ b/pkg/dev_compiler/test/codegen/expect/collection/src/queue_list.txt
@@ -1,10 +1,8 @@
 // Messages from compiling queue_list.dart
-severe: [INVALID_METHOD_OVERRIDE] Mixin introduces an invalid override. The type of ListMixin.expand (((E) → Iterable<dynamic>) → Iterable<dynamic>) is not a subtype of Iterable<E>.expand (<T>((E) → Iterable<T>) → Iterable<T>). (package:collection/src/queue_list.dart, line 12, col 40)
-severe: [INVALID_METHOD_OVERRIDE] Mixin introduces an invalid override. The type of ListMixin.map (((E) → dynamic) → Iterable<dynamic>) is not a subtype of Iterable<E>.map (<T>((E) → T) → Iterable<T>). (package:collection/src/queue_list.dart, line 12, col 40)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<E> to List<dynamic> (package:collection/src/queue_list.dart, line 38, col 25)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 39, col 40)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<E> to List<dynamic> (package:collection/src/queue_list.dart, line 55, col 19)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 61, col 52)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<E> to List<dynamic> (package:collection/src/queue_list.dart, line 44, col 25)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 45, col 40)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<E> to List<dynamic> (package:collection/src/queue_list.dart, line 61, col 19)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 67, col 52)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 71, col 52)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 72, col 40)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 73, col 52)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 77, col 52)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<E> (package:collection/src/queue_list.dart, line 78, col 40)
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.js b/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.js
new file mode 100644
index 000000000000..50d74201c58d
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.js
@@ -0,0 +1,229 @@
+dart_library.library('collection/src/unmodifiable_wrappers', null, /* Imports */[
+  'dart/_runtime',
+  'dart/collection',
+  'dart/core'
+], /* Lazy imports */[
+  'collection/wrappers'
+], function(exports, dart, collection, core, wrappers) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.export(exports, collection, ['UnmodifiableListView', 'UnmodifiableMapView'], []);
+  const NonGrowableListMixin$ = dart.generic(function(E) {
+    class NonGrowableListMixin extends core.Object {
+      static _throw() {
+        dart.throw(new core.UnsupportedError("Cannot change the length of a fixed-length list"));
+      }
+      set length(newLength) {
+        return NonGrowableListMixin$()._throw();
+      }
+      add(value) {
+        dart.as(value, E);
+        return dart.as(NonGrowableListMixin$()._throw(), core.bool);
+      }
+      addAll(iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        return NonGrowableListMixin$()._throw();
+      }
+      insert(index, element) {
+        dart.as(element, E);
+        return NonGrowableListMixin$()._throw();
+      }
+      insertAll(index, iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        return NonGrowableListMixin$()._throw();
+      }
+      remove(value) {
+        return dart.as(NonGrowableListMixin$()._throw(), core.bool);
+      }
+      removeAt(index) {
+        return dart.as(NonGrowableListMixin$()._throw(), E);
+      }
+      removeLast() {
+        return dart.as(NonGrowableListMixin$()._throw(), E);
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return NonGrowableListMixin$()._throw();
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return NonGrowableListMixin$()._throw();
+      }
+      removeRange(start, end) {
+        return NonGrowableListMixin$()._throw();
+      }
+      replaceRange(start, end, iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        return NonGrowableListMixin$()._throw();
+      }
+      clear() {
+        return NonGrowableListMixin$()._throw();
+      }
+    }
+    NonGrowableListMixin[dart.implements] = () => [core.List$(E)];
+    dart.setSignature(NonGrowableListMixin, {
+      methods: () => ({
+        add: [core.bool, [E]],
+        addAll: [dart.void, [core.Iterable$(E)]],
+        insert: [dart.void, [core.int, E]],
+        insertAll: [dart.void, [core.int, core.Iterable$(E)]],
+        remove: [core.bool, [core.Object]],
+        removeAt: [E, [core.int]],
+        removeLast: [E, []],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        removeRange: [dart.void, [core.int, core.int]],
+        replaceRange: [dart.void, [core.int, core.int, core.Iterable$(E)]],
+        clear: [dart.void, []]
+      }),
+      statics: () => ({_throw: [dart.dynamic, []]}),
+      names: ['_throw']
+    });
+    dart.defineExtensionMembers(NonGrowableListMixin, [
+      'add',
+      'addAll',
+      'insert',
+      'insertAll',
+      'remove',
+      'removeAt',
+      'removeLast',
+      'removeWhere',
+      'retainWhere',
+      'removeRange',
+      'replaceRange',
+      'clear',
+      'length'
+    ]);
+    return NonGrowableListMixin;
+  });
+  let NonGrowableListMixin = NonGrowableListMixin$();
+  const NonGrowableListView$ = dart.generic(function(E) {
+    class NonGrowableListView extends dart.mixin(wrappers.DelegatingList$(E), NonGrowableListMixin$(E)) {
+      NonGrowableListView(listBase) {
+        super.DelegatingList(listBase);
+      }
+    }
+    dart.setSignature(NonGrowableListView, {
+      constructors: () => ({NonGrowableListView: [exports.NonGrowableListView$(E), [core.List$(E)]]})
+    });
+    return NonGrowableListView;
+  });
+  dart.defineLazyClassGeneric(exports, 'NonGrowableListView', {get: NonGrowableListView$});
+  const _throw = Symbol('_throw');
+  const UnmodifiableSetMixin$ = dart.generic(function(E) {
+    class UnmodifiableSetMixin extends core.Object {
+      [_throw]() {
+        dart.throw(new core.UnsupportedError("Cannot modify an unmodifiable Set"));
+      }
+      add(value) {
+        dart.as(value, E);
+        return dart.as(this[_throw](), core.bool);
+      }
+      addAll(elements) {
+        dart.as(elements, core.Iterable$(E));
+        return this[_throw]();
+      }
+      remove(value) {
+        return dart.as(this[_throw](), core.bool);
+      }
+      removeAll(elements) {
+        return this[_throw]();
+      }
+      retainAll(elements) {
+        return this[_throw]();
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_throw]();
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_throw]();
+      }
+      clear() {
+        return this[_throw]();
+      }
+    }
+    UnmodifiableSetMixin[dart.implements] = () => [core.Set$(E)];
+    dart.setSignature(UnmodifiableSetMixin, {
+      methods: () => ({
+        [_throw]: [dart.dynamic, []],
+        add: [core.bool, [E]],
+        addAll: [dart.void, [core.Iterable$(E)]],
+        remove: [core.bool, [core.Object]],
+        removeAll: [dart.void, [core.Iterable]],
+        retainAll: [dart.void, [core.Iterable]],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        clear: [dart.void, []]
+      })
+    });
+    return UnmodifiableSetMixin;
+  });
+  let UnmodifiableSetMixin = UnmodifiableSetMixin$();
+  const UnmodifiableSetView$ = dart.generic(function(E) {
+    class UnmodifiableSetView extends dart.mixin(wrappers.DelegatingSet$(E), UnmodifiableSetMixin$(E)) {
+      UnmodifiableSetView(setBase) {
+        super.DelegatingSet(setBase);
+      }
+    }
+    dart.setSignature(UnmodifiableSetView, {
+      constructors: () => ({UnmodifiableSetView: [exports.UnmodifiableSetView$(E), [core.Set$(E)]]})
+    });
+    return UnmodifiableSetView;
+  });
+  dart.defineLazyClassGeneric(exports, 'UnmodifiableSetView', {get: UnmodifiableSetView$});
+  const UnmodifiableMapMixin$ = dart.generic(function(K, V) {
+    class UnmodifiableMapMixin extends core.Object {
+      static _throw() {
+        dart.throw(new core.UnsupportedError("Cannot modify an unmodifiable Map"));
+      }
+      set(key, value) {
+        (() => {
+          dart.as(key, K);
+          dart.as(value, V);
+          return UnmodifiableMapMixin$()._throw();
+        })();
+        return value;
+      }
+      putIfAbsent(key, ifAbsent) {
+        dart.as(key, K);
+        dart.as(ifAbsent, dart.functionType(V, []));
+        return dart.as(UnmodifiableMapMixin$()._throw(), V);
+      }
+      addAll(other) {
+        dart.as(other, core.Map$(K, V));
+        return UnmodifiableMapMixin$()._throw();
+      }
+      remove(key) {
+        return dart.as(UnmodifiableMapMixin$()._throw(), V);
+      }
+      clear() {
+        return UnmodifiableMapMixin$()._throw();
+      }
+    }
+    UnmodifiableMapMixin[dart.implements] = () => [core.Map$(K, V)];
+    dart.setSignature(UnmodifiableMapMixin, {
+      methods: () => ({
+        set: [dart.void, [K, V]],
+        putIfAbsent: [V, [K, dart.functionType(V, [])]],
+        addAll: [dart.void, [core.Map$(K, V)]],
+        remove: [V, [core.Object]],
+        clear: [dart.void, []]
+      }),
+      statics: () => ({_throw: [dart.dynamic, []]}),
+      names: ['_throw']
+    });
+    return UnmodifiableMapMixin;
+  });
+  let UnmodifiableMapMixin = UnmodifiableMapMixin$();
+  // Exports:
+  exports.NonGrowableListMixin$ = NonGrowableListMixin$;
+  exports.NonGrowableListMixin = NonGrowableListMixin;
+  exports.NonGrowableListView$ = NonGrowableListView$;
+  exports.UnmodifiableSetMixin$ = UnmodifiableSetMixin$;
+  exports.UnmodifiableSetMixin = UnmodifiableSetMixin;
+  exports.UnmodifiableSetView$ = UnmodifiableSetView$;
+  exports.UnmodifiableMapMixin$ = UnmodifiableMapMixin$;
+  exports.UnmodifiableMapMixin = UnmodifiableMapMixin;
+});
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.txt b/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
index 7d176160fa77..b544973d0ee4 100644
--- a/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
+++ b/pkg/dev_compiler/test/codegen/expect/collection/src/unmodifiable_wrappers.txt
@@ -1,7 +1,5 @@
 // Messages from compiling unmodifiable_wrappers.dart
-severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.map' and 'Iterable.expand' (package:collection/src/unmodifiable_wrappers.dart, line 20, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of 'Iterable.map' and 'Iterable.expand' (package:collection/src/unmodifiable_wrappers.dart, line 93, col 7)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/src/unmodifiable_wrappers.dart, line 59, col 28)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/src/unmodifiable_wrappers.dart, line 63, col 21)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to V (package:collection/src/unmodifiable_wrappers.dart, line 151, col 41)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to V (package:collection/src/unmodifiable_wrappers.dart, line 159, col 27)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/src/unmodifiable_wrappers.dart, line 88, col 28)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (package:collection/src/unmodifiable_wrappers.dart, line 94, col 21)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to V (package:collection/src/unmodifiable_wrappers.dart, line 218, col 41)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to V (package:collection/src/unmodifiable_wrappers.dart, line 230, col 27)
diff --git a/pkg/dev_compiler/test/codegen/expect/collection/wrappers.js b/pkg/dev_compiler/test/codegen/expect/collection/wrappers.js
new file mode 100644
index 000000000000..d0f23a4eda12
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/collection/wrappers.js
@@ -0,0 +1,809 @@
+dart_library.library('collection/wrappers', null, /* Imports */[
+  'dart/_runtime',
+  'collection/src/canonicalized_map',
+  'dart/core',
+  'dart/math',
+  'dart/collection'
+], /* Lazy imports */[
+  'collection/src/unmodifiable_wrappers'
+], function(exports, dart, canonicalized_map, core, math, collection, unmodifiable_wrappers) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.export(exports, canonicalized_map);
+  dart.export(exports, unmodifiable_wrappers);
+  const _base = Symbol('_base');
+  const _DelegatingIterableBase$ = dart.generic(function(E) {
+    class _DelegatingIterableBase extends core.Object {
+      _DelegatingIterableBase() {
+      }
+      any(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.any](test);
+      }
+      contains(element) {
+        return this[_base][dartx.contains](element);
+      }
+      elementAt(index) {
+        return this[_base][dartx.elementAt](index);
+      }
+      every(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.every](test);
+      }
+      expand(f) {
+        dart.as(f, dart.functionType(core.Iterable, [E]));
+        return this[_base][dartx.expand](f);
+      }
+      get first() {
+        return this[_base][dartx.first];
+      }
+      firstWhere(test, opts) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
+        dart.as(orElse, dart.functionType(E, []));
+        return this[_base][dartx.firstWhere](test, {orElse: orElse});
+      }
+      fold(initialValue, combine) {
+        dart.as(combine, dart.functionType(dart.dynamic, [dart.dynamic, E]));
+        return this[_base][dartx.fold](initialValue, combine);
+      }
+      forEach(f) {
+        dart.as(f, dart.functionType(dart.void, [E]));
+        return this[_base][dartx.forEach](f);
+      }
+      get isEmpty() {
+        return this[_base][dartx.isEmpty];
+      }
+      get isNotEmpty() {
+        return this[_base][dartx.isNotEmpty];
+      }
+      get iterator() {
+        return this[_base][dartx.iterator];
+      }
+      [Symbol.iterator]() {
+        return new dart.JsIterator(this.iterator);
+      }
+      join(separator) {
+        if (separator === void 0) separator = "";
+        return this[_base][dartx.join](separator);
+      }
+      get last() {
+        return this[_base][dartx.last];
+      }
+      lastWhere(test, opts) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        let orElse = opts && 'orElse' in opts ? opts.orElse : null;
+        dart.as(orElse, dart.functionType(E, []));
+        return this[_base][dartx.lastWhere](test, {orElse: orElse});
+      }
+      get length() {
+        return this[_base][dartx.length];
+      }
+      map(f) {
+        dart.as(f, dart.functionType(dart.dynamic, [E]));
+        return this[_base][dartx.map](f);
+      }
+      reduce(combine) {
+        dart.as(combine, dart.functionType(E, [E, E]));
+        return this[_base][dartx.reduce](combine);
+      }
+      get single() {
+        return this[_base][dartx.single];
+      }
+      singleWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.singleWhere](test);
+      }
+      skip(n) {
+        return this[_base][dartx.skip](n);
+      }
+      skipWhile(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.skipWhile](test);
+      }
+      take(n) {
+        return this[_base][dartx.take](n);
+      }
+      takeWhile(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.takeWhile](test);
+      }
+      toList(opts) {
+        let growable = opts && 'growable' in opts ? opts.growable : true;
+        return this[_base][dartx.toList]({growable: growable});
+      }
+      toSet() {
+        return this[_base][dartx.toSet]();
+      }
+      where(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        return this[_base][dartx.where](test);
+      }
+      toString() {
+        return dart.toString(this[_base]);
+      }
+    }
+    _DelegatingIterableBase[dart.implements] = () => [core.Iterable$(E)];
+    dart.setSignature(_DelegatingIterableBase, {
+      constructors: () => ({_DelegatingIterableBase: [_DelegatingIterableBase$(E), []]}),
+      methods: () => ({
+        any: [core.bool, [dart.functionType(core.bool, [E])]],
+        contains: [core.bool, [core.Object]],
+        elementAt: [E, [core.int]],
+        every: [core.bool, [dart.functionType(core.bool, [E])]],
+        expand: [core.Iterable, [dart.functionType(core.Iterable, [E])]],
+        firstWhere: [E, [dart.functionType(core.bool, [E])], {orElse: dart.functionType(E, [])}],
+        fold: [dart.dynamic, [dart.dynamic, dart.functionType(dart.dynamic, [dart.dynamic, E])]],
+        forEach: [dart.void, [dart.functionType(dart.void, [E])]],
+        join: [core.String, [], [core.String]],
+        lastWhere: [E, [dart.functionType(core.bool, [E])], {orElse: dart.functionType(E, [])}],
+        map: [core.Iterable, [dart.functionType(dart.dynamic, [E])]],
+        reduce: [E, [dart.functionType(E, [E, E])]],
+        singleWhere: [E, [dart.functionType(core.bool, [E])]],
+        skip: [core.Iterable$(E), [core.int]],
+        skipWhile: [core.Iterable$(E), [dart.functionType(core.bool, [E])]],
+        take: [core.Iterable$(E), [core.int]],
+        takeWhile: [core.Iterable$(E), [dart.functionType(core.bool, [E])]],
+        toList: [core.List$(E), [], {growable: core.bool}],
+        toSet: [core.Set$(E), []],
+        where: [core.Iterable$(E), [dart.functionType(core.bool, [E])]]
+      })
+    });
+    dart.defineExtensionMembers(_DelegatingIterableBase, [
+      'any',
+      'contains',
+      'elementAt',
+      'every',
+      'expand',
+      'firstWhere',
+      'fold',
+      'forEach',
+      'join',
+      'lastWhere',
+      'map',
+      'reduce',
+      'singleWhere',
+      'skip',
+      'skipWhile',
+      'take',
+      'takeWhile',
+      'toList',
+      'toSet',
+      'where',
+      'toString',
+      'first',
+      'isEmpty',
+      'isNotEmpty',
+      'iterator',
+      'last',
+      'length',
+      'single'
+    ]);
+    return _DelegatingIterableBase;
+  });
+  let _DelegatingIterableBase = _DelegatingIterableBase$();
+  const DelegatingIterable$ = dart.generic(function(E) {
+    class DelegatingIterable extends _DelegatingIterableBase$(E) {
+      DelegatingIterable(base) {
+        this[_base] = base;
+        super._DelegatingIterableBase();
+      }
+    }
+    dart.setSignature(DelegatingIterable, {
+      constructors: () => ({DelegatingIterable: [DelegatingIterable$(E), [core.Iterable$(E)]]})
+    });
+    return DelegatingIterable;
+  });
+  let DelegatingIterable = DelegatingIterable$();
+  const _listBase = Symbol('_listBase');
+  const DelegatingList$ = dart.generic(function(E) {
+    class DelegatingList extends DelegatingIterable$(E) {
+      DelegatingList(base) {
+        super.DelegatingIterable(base);
+      }
+      get [_listBase]() {
+        return dart.as(this[_base], core.List$(E));
+      }
+      get(index) {
+        return this[_listBase][dartx.get](index);
+      }
+      set(index, value) {
+        dart.as(value, E);
+        this[_listBase][dartx.set](index, value);
+        return value;
+      }
+      add(value) {
+        dart.as(value, E);
+        this[_listBase][dartx.add](value);
+      }
+      addAll(iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        this[_listBase][dartx.addAll](iterable);
+      }
+      asMap() {
+        return this[_listBase][dartx.asMap]();
+      }
+      clear() {
+        this[_listBase][dartx.clear]();
+      }
+      fillRange(start, end, fillValue) {
+        if (fillValue === void 0) fillValue = null;
+        dart.as(fillValue, E);
+        this[_listBase][dartx.fillRange](start, end, fillValue);
+      }
+      getRange(start, end) {
+        return this[_listBase][dartx.getRange](start, end);
+      }
+      indexOf(element, start) {
+        dart.as(element, E);
+        if (start === void 0) start = 0;
+        return this[_listBase][dartx.indexOf](element, start);
+      }
+      insert(index, element) {
+        dart.as(element, E);
+        this[_listBase][dartx.insert](index, element);
+      }
+      insertAll(index, iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        this[_listBase][dartx.insertAll](index, iterable);
+      }
+      lastIndexOf(element, start) {
+        dart.as(element, E);
+        if (start === void 0) start = null;
+        return this[_listBase][dartx.lastIndexOf](element, start);
+      }
+      set length(newLength) {
+        this[_listBase][dartx.length] = newLength;
+      }
+      remove(value) {
+        return this[_listBase][dartx.remove](value);
+      }
+      removeAt(index) {
+        return this[_listBase][dartx.removeAt](index);
+      }
+      removeLast() {
+        return this[_listBase][dartx.removeLast]();
+      }
+      removeRange(start, end) {
+        this[_listBase][dartx.removeRange](start, end);
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_listBase][dartx.removeWhere](test);
+      }
+      replaceRange(start, end, iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        this[_listBase][dartx.replaceRange](start, end, iterable);
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_listBase][dartx.retainWhere](test);
+      }
+      get reversed() {
+        return this[_listBase][dartx.reversed];
+      }
+      setAll(index, iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        this[_listBase][dartx.setAll](index, iterable);
+      }
+      setRange(start, end, iterable, skipCount) {
+        dart.as(iterable, core.Iterable$(E));
+        if (skipCount === void 0) skipCount = 0;
+        this[_listBase][dartx.setRange](start, end, iterable, skipCount);
+      }
+      shuffle(random) {
+        if (random === void 0) random = null;
+        this[_listBase][dartx.shuffle](random);
+      }
+      sort(compare) {
+        if (compare === void 0) compare = null;
+        dart.as(compare, dart.functionType(core.int, [E, E]));
+        this[_listBase][dartx.sort](compare);
+      }
+      sublist(start, end) {
+        if (end === void 0) end = null;
+        return this[_listBase][dartx.sublist](start, end);
+      }
+    }
+    DelegatingList[dart.implements] = () => [core.List$(E)];
+    dart.setSignature(DelegatingList, {
+      constructors: () => ({DelegatingList: [DelegatingList$(E), [core.List$(E)]]}),
+      methods: () => ({
+        get: [E, [core.int]],
+        set: [dart.void, [core.int, E]],
+        add: [dart.void, [E]],
+        addAll: [dart.void, [core.Iterable$(E)]],
+        asMap: [core.Map$(core.int, E), []],
+        clear: [dart.void, []],
+        fillRange: [dart.void, [core.int, core.int], [E]],
+        getRange: [core.Iterable$(E), [core.int, core.int]],
+        indexOf: [core.int, [E], [core.int]],
+        insert: [dart.void, [core.int, E]],
+        insertAll: [dart.void, [core.int, core.Iterable$(E)]],
+        lastIndexOf: [core.int, [E], [core.int]],
+        remove: [core.bool, [core.Object]],
+        removeAt: [E, [core.int]],
+        removeLast: [E, []],
+        removeRange: [dart.void, [core.int, core.int]],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        replaceRange: [dart.void, [core.int, core.int, core.Iterable$(E)]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        setAll: [dart.void, [core.int, core.Iterable$(E)]],
+        setRange: [dart.void, [core.int, core.int, core.Iterable$(E)], [core.int]],
+        shuffle: [dart.void, [], [math.Random]],
+        sort: [dart.void, [], [dart.functionType(core.int, [E, E])]],
+        sublist: [core.List$(E), [core.int], [core.int]]
+      })
+    });
+    dart.defineExtensionMembers(DelegatingList, [
+      'get',
+      'set',
+      'add',
+      'addAll',
+      'asMap',
+      'clear',
+      'fillRange',
+      'getRange',
+      'indexOf',
+      'insert',
+      'insertAll',
+      'lastIndexOf',
+      'remove',
+      'removeAt',
+      'removeLast',
+      'removeRange',
+      'removeWhere',
+      'replaceRange',
+      'retainWhere',
+      'setAll',
+      'setRange',
+      'shuffle',
+      'sort',
+      'sublist',
+      'length',
+      'reversed'
+    ]);
+    return DelegatingList;
+  });
+  let DelegatingList = DelegatingList$();
+  const _setBase = Symbol('_setBase');
+  const DelegatingSet$ = dart.generic(function(E) {
+    class DelegatingSet extends DelegatingIterable$(E) {
+      DelegatingSet(base) {
+        super.DelegatingIterable(base);
+      }
+      get [_setBase]() {
+        return dart.as(this[_base], core.Set$(E));
+      }
+      add(value) {
+        dart.as(value, E);
+        return this[_setBase].add(value);
+      }
+      addAll(elements) {
+        dart.as(elements, core.Iterable$(E));
+        this[_setBase].addAll(elements);
+      }
+      clear() {
+        this[_setBase].clear();
+      }
+      containsAll(other) {
+        return this[_setBase].containsAll(other);
+      }
+      difference(other) {
+        dart.as(other, core.Set$(E));
+        return this[_setBase].difference(other);
+      }
+      intersection(other) {
+        return this[_setBase].intersection(other);
+      }
+      lookup(element) {
+        return this[_setBase].lookup(element);
+      }
+      remove(value) {
+        return this[_setBase].remove(value);
+      }
+      removeAll(elements) {
+        this[_setBase].removeAll(elements);
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_setBase].removeWhere(test);
+      }
+      retainAll(elements) {
+        this[_setBase].retainAll(elements);
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_setBase].retainWhere(test);
+      }
+      union(other) {
+        dart.as(other, core.Set$(E));
+        return this[_setBase].union(other);
+      }
+      toSet() {
+        return new (DelegatingSet$(E))(this[_setBase].toSet());
+      }
+    }
+    DelegatingSet[dart.implements] = () => [core.Set$(E)];
+    dart.setSignature(DelegatingSet, {
+      constructors: () => ({DelegatingSet: [DelegatingSet$(E), [core.Set$(E)]]}),
+      methods: () => ({
+        add: [core.bool, [E]],
+        addAll: [dart.void, [core.Iterable$(E)]],
+        clear: [dart.void, []],
+        containsAll: [core.bool, [core.Iterable$(core.Object)]],
+        difference: [core.Set$(E), [core.Set$(E)]],
+        intersection: [core.Set$(E), [core.Set$(core.Object)]],
+        lookup: [E, [core.Object]],
+        remove: [core.bool, [core.Object]],
+        removeAll: [dart.void, [core.Iterable$(core.Object)]],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        retainAll: [dart.void, [core.Iterable$(core.Object)]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        union: [core.Set$(E), [core.Set$(E)]],
+        toSet: [core.Set$(E), []]
+      })
+    });
+    dart.defineExtensionMembers(DelegatingSet, ['toSet']);
+    return DelegatingSet;
+  });
+  let DelegatingSet = DelegatingSet$();
+  const _baseQueue = Symbol('_baseQueue');
+  const DelegatingQueue$ = dart.generic(function(E) {
+    class DelegatingQueue extends DelegatingIterable$(E) {
+      DelegatingQueue(queue) {
+        super.DelegatingIterable(queue);
+      }
+      get [_baseQueue]() {
+        return dart.as(this[_base], collection.Queue$(E));
+      }
+      add(value) {
+        dart.as(value, E);
+        this[_baseQueue].add(value);
+      }
+      addAll(iterable) {
+        dart.as(iterable, core.Iterable$(E));
+        this[_baseQueue].addAll(iterable);
+      }
+      addFirst(value) {
+        dart.as(value, E);
+        this[_baseQueue].addFirst(value);
+      }
+      addLast(value) {
+        dart.as(value, E);
+        this[_baseQueue].addLast(value);
+      }
+      clear() {
+        this[_baseQueue].clear();
+      }
+      remove(object) {
+        return this[_baseQueue].remove(object);
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_baseQueue].removeWhere(test);
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [E]));
+        this[_baseQueue].retainWhere(test);
+      }
+      removeFirst() {
+        return this[_baseQueue].removeFirst();
+      }
+      removeLast() {
+        return this[_baseQueue].removeLast();
+      }
+    }
+    DelegatingQueue[dart.implements] = () => [collection.Queue$(E)];
+    dart.setSignature(DelegatingQueue, {
+      constructors: () => ({DelegatingQueue: [DelegatingQueue$(E), [collection.Queue$(E)]]}),
+      methods: () => ({
+        add: [dart.void, [E]],
+        addAll: [dart.void, [core.Iterable$(E)]],
+        addFirst: [dart.void, [E]],
+        addLast: [dart.void, [E]],
+        clear: [dart.void, []],
+        remove: [core.bool, [core.Object]],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [E])]],
+        removeFirst: [E, []],
+        removeLast: [E, []]
+      })
+    });
+    return DelegatingQueue;
+  });
+  let DelegatingQueue = DelegatingQueue$();
+  const DelegatingMap$ = dart.generic(function(K, V) {
+    class DelegatingMap extends core.Object {
+      DelegatingMap(base) {
+        this[_base] = base;
+      }
+      get(key) {
+        return this[_base].get(key);
+      }
+      set(key, value) {
+        dart.as(key, K);
+        dart.as(value, V);
+        this[_base].set(key, value);
+        return value;
+      }
+      addAll(other) {
+        dart.as(other, core.Map$(K, V));
+        this[_base].addAll(other);
+      }
+      clear() {
+        this[_base].clear();
+      }
+      containsKey(key) {
+        return this[_base].containsKey(key);
+      }
+      containsValue(value) {
+        return this[_base].containsValue(value);
+      }
+      forEach(f) {
+        dart.as(f, dart.functionType(dart.void, [K, V]));
+        this[_base].forEach(f);
+      }
+      get isEmpty() {
+        return this[_base].isEmpty;
+      }
+      get isNotEmpty() {
+        return this[_base].isNotEmpty;
+      }
+      get keys() {
+        return this[_base].keys;
+      }
+      get length() {
+        return this[_base].length;
+      }
+      putIfAbsent(key, ifAbsent) {
+        dart.as(key, K);
+        dart.as(ifAbsent, dart.functionType(V, []));
+        return this[_base].putIfAbsent(key, ifAbsent);
+      }
+      remove(key) {
+        return this[_base].remove(key);
+      }
+      get values() {
+        return this[_base].values;
+      }
+      toString() {
+        return dart.toString(this[_base]);
+      }
+    }
+    DelegatingMap[dart.implements] = () => [core.Map$(K, V)];
+    dart.setSignature(DelegatingMap, {
+      constructors: () => ({DelegatingMap: [DelegatingMap$(K, V), [core.Map$(K, V)]]}),
+      methods: () => ({
+        get: [V, [core.Object]],
+        set: [dart.void, [K, V]],
+        addAll: [dart.void, [core.Map$(K, V)]],
+        clear: [dart.void, []],
+        containsKey: [core.bool, [core.Object]],
+        containsValue: [core.bool, [core.Object]],
+        forEach: [dart.void, [dart.functionType(dart.void, [K, V])]],
+        putIfAbsent: [V, [K, dart.functionType(V, [])]],
+        remove: [V, [core.Object]]
+      })
+    });
+    return DelegatingMap;
+  });
+  let DelegatingMap = DelegatingMap$();
+  const _baseMap = Symbol('_baseMap');
+  const MapKeySet$ = dart.generic(function(E) {
+    class MapKeySet extends dart.mixin(_DelegatingIterableBase$(E), unmodifiable_wrappers.UnmodifiableSetMixin$(E)) {
+      MapKeySet(base) {
+        this[_baseMap] = base;
+        super._DelegatingIterableBase();
+      }
+      get [_base]() {
+        return this[_baseMap].keys;
+      }
+      contains(element) {
+        return this[_baseMap].containsKey(element);
+      }
+      get isEmpty() {
+        return this[_baseMap].isEmpty;
+      }
+      get isNotEmpty() {
+        return this[_baseMap].isNotEmpty;
+      }
+      get length() {
+        return this[_baseMap].length;
+      }
+      toString() {
+        return `{${this[_base][dartx.join](', ')}}`;
+      }
+      containsAll(other) {
+        return other[dartx.every](dart.bind(this, 'contains'));
+      }
+      difference(other) {
+        dart.as(other, core.Set$(E));
+        return this.where(dart.fn(element => !dart.notNull(other.contains(element)), core.bool, [E]))[dartx.toSet]();
+      }
+      intersection(other) {
+        return this.where(dart.bind(other, 'contains'))[dartx.toSet]();
+      }
+      lookup(element) {
+        dart.as(element, E);
+        return dart.throw(new core.UnsupportedError("MapKeySet doesn't support lookup()."));
+      }
+      union(other) {
+        dart.as(other, core.Set$(E));
+        return (() => {
+          let _ = this.toSet();
+          _.addAll(other);
+          return _;
+        })();
+      }
+    }
+    dart.setSignature(MapKeySet, {
+      constructors: () => ({MapKeySet: [exports.MapKeySet$(E), [core.Map$(E, dart.dynamic)]]}),
+      methods: () => ({
+        containsAll: [core.bool, [core.Iterable$(core.Object)]],
+        difference: [core.Set$(E), [core.Set$(E)]],
+        intersection: [core.Set$(E), [core.Set$(core.Object)]],
+        lookup: [E, [E]],
+        union: [core.Set$(E), [core.Set$(E)]]
+      })
+    });
+    dart.defineExtensionMembers(MapKeySet, [
+      'contains',
+      'toString',
+      'isEmpty',
+      'isNotEmpty',
+      'length'
+    ]);
+    return MapKeySet;
+  });
+  dart.defineLazyClassGeneric(exports, 'MapKeySet', {get: MapKeySet$});
+  const _keyForValue = Symbol('_keyForValue');
+  const MapValueSet$ = dart.generic(function(K, V) {
+    class MapValueSet extends _DelegatingIterableBase$(V) {
+      MapValueSet(base, keyForValue) {
+        this[_baseMap] = base;
+        this[_keyForValue] = keyForValue;
+        super._DelegatingIterableBase();
+      }
+      get [_base]() {
+        return this[_baseMap].values;
+      }
+      contains(element) {
+        if (element != null && !dart.is(element, V)) return false;
+        return this[_baseMap].containsKey(dart.dcall(this[_keyForValue], element));
+      }
+      get isEmpty() {
+        return this[_baseMap].isEmpty;
+      }
+      get isNotEmpty() {
+        return this[_baseMap].isNotEmpty;
+      }
+      get length() {
+        return this[_baseMap].length;
+      }
+      toString() {
+        return dart.toString(this.toSet());
+      }
+      add(value) {
+        dart.as(value, V);
+        let key = dart.as(dart.dcall(this[_keyForValue], value), K);
+        let result = false;
+        this[_baseMap].putIfAbsent(key, dart.fn(() => {
+          result = true;
+          return value;
+        }, V, []));
+        return result;
+      }
+      addAll(elements) {
+        dart.as(elements, core.Iterable$(V));
+        return elements[dartx.forEach](dart.bind(this, 'add'));
+      }
+      clear() {
+        return this[_baseMap].clear();
+      }
+      containsAll(other) {
+        return other[dartx.every](dart.bind(this, 'contains'));
+      }
+      difference(other) {
+        dart.as(other, core.Set$(V));
+        return this.where(dart.fn(element => !dart.notNull(other.contains(element)), core.bool, [V]))[dartx.toSet]();
+      }
+      intersection(other) {
+        return this.where(dart.bind(other, 'contains'))[dartx.toSet]();
+      }
+      lookup(element) {
+        return this[_baseMap].get(dart.dcall(this[_keyForValue], element));
+      }
+      remove(value) {
+        if (value != null && !dart.is(value, V)) return false;
+        let key = dart.dcall(this[_keyForValue], value);
+        if (!dart.notNull(this[_baseMap].containsKey(key))) return false;
+        this[_baseMap].remove(key);
+        return true;
+      }
+      removeAll(elements) {
+        return elements[dartx.forEach](dart.bind(this, 'remove'));
+      }
+      removeWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [V]));
+        let toRemove = [];
+        this[_baseMap].forEach(dart.fn((key, value) => {
+          dart.as(key, K);
+          dart.as(value, V);
+          if (dart.notNull(test(value))) toRemove[dartx.add](key);
+        }, dart.void, [K, V]));
+        toRemove[dartx.forEach](dart.bind(this[_baseMap], 'remove'));
+      }
+      retainAll(elements) {
+        let valuesToRetain = core.Set$(V).identity();
+        for (let element of elements) {
+          if (element != null && !dart.is(element, V)) continue;
+          let key = dart.dcall(this[_keyForValue], element);
+          if (!dart.notNull(this[_baseMap].containsKey(key))) continue;
+          valuesToRetain.add(this[_baseMap].get(key));
+        }
+        let keysToRemove = [];
+        this[_baseMap].forEach(dart.fn((k, v) => {
+          dart.as(k, K);
+          dart.as(v, V);
+          if (!dart.notNull(valuesToRetain.contains(v))) keysToRemove[dartx.add](k);
+        }, dart.void, [K, V]));
+        keysToRemove[dartx.forEach](dart.bind(this[_baseMap], 'remove'));
+      }
+      retainWhere(test) {
+        dart.as(test, dart.functionType(core.bool, [V]));
+        return this.removeWhere(dart.fn(element => !dart.notNull(test(element)), core.bool, [V]));
+      }
+      union(other) {
+        dart.as(other, core.Set$(V));
+        return (() => {
+          let _ = this.toSet();
+          _.addAll(other);
+          return _;
+        })();
+      }
+    }
+    MapValueSet[dart.implements] = () => [core.Set$(V)];
+    dart.setSignature(MapValueSet, {
+      constructors: () => ({MapValueSet: [MapValueSet$(K, V), [core.Map$(K, V), dart.functionType(K, [V])]]}),
+      methods: () => ({
+        add: [core.bool, [V]],
+        addAll: [dart.void, [core.Iterable$(V)]],
+        clear: [dart.void, []],
+        containsAll: [core.bool, [core.Iterable$(core.Object)]],
+        difference: [core.Set$(V), [core.Set$(V)]],
+        intersection: [core.Set$(V), [core.Set$(core.Object)]],
+        lookup: [V, [core.Object]],
+        remove: [core.bool, [core.Object]],
+        removeAll: [dart.void, [core.Iterable$(core.Object)]],
+        removeWhere: [dart.void, [dart.functionType(core.bool, [V])]],
+        retainAll: [dart.void, [core.Iterable$(core.Object)]],
+        retainWhere: [dart.void, [dart.functionType(core.bool, [V])]],
+        union: [core.Set$(V), [core.Set$(V)]]
+      })
+    });
+    dart.defineExtensionMembers(MapValueSet, [
+      'contains',
+      'toString',
+      'isEmpty',
+      'isNotEmpty',
+      'length'
+    ]);
+    return MapValueSet;
+  });
+  let MapValueSet = MapValueSet$();
+  // Exports:
+  exports.DelegatingIterable$ = DelegatingIterable$;
+  exports.DelegatingIterable = DelegatingIterable;
+  exports.DelegatingList$ = DelegatingList$;
+  exports.DelegatingList = DelegatingList;
+  exports.DelegatingSet$ = DelegatingSet$;
+  exports.DelegatingSet = DelegatingSet;
+  exports.DelegatingQueue$ = DelegatingQueue$;
+  exports.DelegatingQueue = DelegatingQueue;
+  exports.DelegatingMap$ = DelegatingMap$;
+  exports.DelegatingMap = DelegatingMap;
+  exports.MapKeySet$ = MapKeySet$;
+  exports.MapValueSet$ = MapValueSet$;
+  exports.MapValueSet = MapValueSet;
+});
diff --git a/pkg/dev_compiler/test/codegen/expect/html_input.html b/pkg/dev_compiler/test/codegen/expect/html_input.html
index 210e5b2652c0..006499e9f062 100644
--- a/pkg/dev_compiler/test/codegen/expect/html_input.html
+++ b/pkg/dev_compiler/test/codegen/expect/html_input.html
@@ -21,8 +21,8 @@
 <script src="dev_compiler/runtime/dart/_js_mirrors.js"></script>
 <script src="dev_compiler/runtime/dart/js.js"></script>
 <script src="dev_compiler/runtime/dart/_metadata.js"></script>
-<script src="dev_compiler/runtime/dart/html_common.js"></script>
 <script src="dev_compiler/runtime/dart/html.js"></script>
+<script src="dev_compiler/runtime/dart/html_common.js"></script>
 <script src="dev_compiler/runtime/dart/_debugger.js"></script>
 <script src="dir/html_input_d.js"></script>
 <script src="dir/html_input_b.js"></script>
diff --git a/pkg/dev_compiler/test/codegen/expect/language-all.js b/pkg/dev_compiler/test/codegen/expect/language-all.js
index 1b51d3c398a6..d02176154e29 100644
--- a/pkg/dev_compiler/test/codegen/expect/language-all.js
+++ b/pkg/dev_compiler/test/codegen/expect/language-all.js
@@ -26391,6 +26391,253 @@ dart_library.library('language/built_in_identifier_prefix_library_typedef', null
   exports.C$ = C$;
   exports.C = C;
 });
+dart_library.library('language/built_in_identifier_test_01_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  class PseudoKWTest extends core.Object {
+    static testMain() {
+      let abstract = 0;
+      let as = 0;
+      let dynamic = 0;
+      let export$ = 0;
+      let external = 0;
+      let factory = 0;
+      let get = 0;
+      let implements$ = 0;
+      let import$ = 0;
+      let library = 0;
+      let operator = 0;
+      let part = 0;
+      let set = 0;
+      let static$ = 0;
+      let typedef = 0;
+      let native = 0;
+      {
+        function factory(set) {
+          return;
+        }
+        dart.fn(factory, dart.void, [dart.dynamic]);
+      }
+      get:
+        while (import$ > 0) {
+          break get;
+        }
+      return static$ + library * operator;
+    }
+  }
+  dart.setSignature(PseudoKWTest, {
+    statics: () => ({testMain: [dart.dynamic, []]}),
+    names: ['testMain']
+  });
+  function typedef(x) {
+    return `typedef ${x}`;
+  }
+  dart.fn(typedef);
+  function static$(abstract) {
+    return dart.equals(abstract, true);
+  }
+  dart.fn(static$);
+  class A extends core.Object {
+    A() {
+      this.typedef = 0;
+      this.operator = "smooth";
+    }
+    set(x) {
+      this.typedef = dart.as(x, core.int);
+    }
+    get() {
+      return dart.notNull(this.typedef) - 5;
+    }
+    static static() {
+      return 1;
+    }
+    static check() {
+      let o = new A();
+      o.set(55);
+      expect.Expect.equals(50, o.get());
+      A.static();
+    }
+  }
+  dart.setSignature(A, {
+    methods: () => ({
+      set: [dart.dynamic, [dart.dynamic]],
+      get: [dart.dynamic, []]
+    }),
+    statics: () => ({
+      static: [dart.dynamic, []],
+      check: [dart.dynamic, []]
+    }),
+    names: ['static', 'check']
+  });
+  class B extends core.Object {
+    B() {
+      this.set = 100;
+    }
+    get get() {
+      return this.set;
+    }
+    set get(get) {
+      return this.set = dart.asInt(2 * dart.notNull(dart.as(dart.dload(get, 'get'), core.num)));
+    }
+    static() {
+      let set = new B();
+      set.get = set;
+      expect.Expect.equals(200, set.get);
+    }
+    operator() {
+      return 1;
+    }
+  }
+  dart.setSignature(B, {
+    methods: () => ({
+      static: [dart.dynamic, []],
+      operator: [core.int, []]
+    })
+  });
+  class C extends core.Object {
+    static get set() {
+      return 111;
+    }
+    static set set(set) {}
+  }
+  C.operator = 5;
+  C.get = null;
+  function main() {
+    PseudoKWTest.testMain();
+    A.check();
+    new B().static();
+    expect.Expect.equals(1, new B().operator());
+    expect.Expect.equals(1, A.static());
+    typedef("T");
+    expect.Expect.equals("typedef T", typedef("T"));
+    static$("true");
+    expect.Expect.equals(false, static$("true"));
+    expect.Expect.equals(5, C.operator);
+    expect.Expect.equals(null, C.get);
+    C.set = 0;
+    expect.Expect.equals(111, C.set);
+  }
+  dart.fn(main);
+  // Exports:
+  exports.PseudoKWTest = PseudoKWTest;
+  exports.typedef = typedef;
+  exports.static = static$;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.main = main;
+});
+dart_library.library('language/built_in_identifier_test_none_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  class PseudoKWTest extends core.Object {
+    static testMain() {
+      let as = 0;
+      let dynamic = 0;
+      let export$ = 0;
+      let factory = 0;
+      let get = 0;
+      let implements$ = 0;
+      let import$ = 0;
+      let library = 0;
+      let operator = 0;
+      let part = 0;
+      let set = 0;
+      let typedef = 0;
+      let native = 0;
+      {
+        function factory(set) {
+        }
+        dart.fn(factory, dart.void, [dart.dynamic]);
+      }
+      get:
+        while (import$ > 0) {
+          break get;
+        }
+      return library * operator;
+    }
+  }
+  dart.setSignature(PseudoKWTest, {
+    statics: () => ({testMain: [dart.dynamic, []]}),
+    names: ['testMain']
+  });
+  class A extends core.Object {
+    A() {
+      this.typedef = 0;
+      this.operator = "smooth";
+    }
+    set(x) {
+      this.typedef = dart.as(x, core.int);
+    }
+    get() {
+      return dart.notNull(this.typedef) - 5;
+    }
+    static check() {
+      let o = new A();
+      o.set(55);
+      expect.Expect.equals(50, o.get());
+    }
+  }
+  dart.setSignature(A, {
+    methods: () => ({
+      set: [dart.dynamic, [dart.dynamic]],
+      get: [dart.dynamic, []]
+    }),
+    statics: () => ({check: [dart.dynamic, []]}),
+    names: ['check']
+  });
+  class B extends core.Object {
+    B() {
+      this.set = 100;
+    }
+    get get() {
+      return this.set;
+    }
+    set get(get) {
+      return this.set = dart.asInt(2 * dart.notNull(dart.as(dart.dload(get, 'get'), core.num)));
+    }
+    operator() {
+      return 1;
+    }
+  }
+  dart.setSignature(B, {
+    methods: () => ({operator: [core.int, []]})
+  });
+  class C extends core.Object {
+    static get set() {
+      return 111;
+    }
+    static set set(set) {}
+  }
+  C.operator = 5;
+  C.get = null;
+  function main() {
+    PseudoKWTest.testMain();
+    A.check();
+    expect.Expect.equals(1, new B().operator());
+    expect.Expect.equals(5, C.operator);
+    expect.Expect.equals(null, C.get);
+    C.set = 0;
+    expect.Expect.equals(111, C.set);
+  }
+  dart.fn(main);
+  // Exports:
+  exports.PseudoKWTest = PseudoKWTest;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.main = main;
+});
 dart_library.library('language/call_argument_inference_test', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
@@ -60417,6 +60664,131 @@ dart_library.library('language/function_getter_test', null, /* Imports */[
   exports.A = A;
   exports.main = main;
 });
+dart_library.library('language/function_literals_test', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  const IntFunc = dart.typedef('IntFunc', () => dart.functionType(core.int, [dart.dynamic]));
+  class FunctionLiteralsTest extends core.Object {
+    static checkIntFunction(expected, f, arg) {
+      expect.Expect.equals(expected, dart.dcall(f, arg));
+    }
+    static checkIntFuncFunction(expected, f, arg) {
+      expect.Expect.equals(expected, dart.dcall(dart.dcall(f, arg), arg));
+    }
+    func1(x) {
+      return x;
+    }
+    func2(x) {
+      return dart.as(x, core.int);
+    }
+    func3(x) {
+      return x;
+    }
+    func4(x) {
+      return dart.as(x, core.int);
+    }
+    FunctionLiteralsTest() {
+    }
+    static testMain() {
+      let test = new FunctionLiteralsTest();
+      test.testArrow();
+      test.testArrowArrow();
+      test.testArrowBlock();
+      test.testBlock();
+      test.testBlockArrow();
+      test.testBlockBlock();
+      test.testFunctionRef();
+    }
+    testArrow() {
+      FunctionLiteralsTest.checkIntFunction(42, dart.fn(x => dart.as(x, core.int), core.int, [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFunction(42, dart.fn(x => x, core.int, [core.int]), 42);
+    }
+    testArrowArrow() {
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => dart.fn(y => dart.as(dart.dsend(x, '+', y), core.int), core.int, [dart.dynamic]), dart.functionType(core.int, [dart.dynamic]), [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.as(dart.fn(x => dart.fn(y => dart.notNull(x) + dart.notNull(dart.as(y, core.num)), core.num, [dart.dynamic]), dart.functionType(core.num, [dart.dynamic]), [core.int]), __CastType0), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => dart.fn(y => dart.as(dart.dsend(x, '+', y), core.int), core.int, [dart.dynamic]), dart.functionType(core.int, [dart.dynamic]), [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.as(dart.fn(x => dart.fn(y => dart.notNull(x) + dart.notNull(dart.as(y, core.num)), core.num, [dart.dynamic]), dart.functionType(core.num, [dart.dynamic]), [core.int]), dart.functionType(IntFunc, [dart.dynamic])), 42);
+    }
+    testArrowBlock() {
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => dart.fn(y => {
+        return dart.as(dart.dsend(x, '+', y), core.int);
+      }, core.int, [dart.dynamic]), dart.functionType(core.int, [dart.dynamic]), [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => dart.fn(y => {
+        return dart.asInt(dart.notNull(x) + dart.notNull(dart.as(y, core.num)));
+      }, core.int, [dart.dynamic]), dart.functionType(core.int, [dart.dynamic]), [core.int]), 42);
+    }
+    testBlock() {
+      FunctionLiteralsTest.checkIntFunction(42, dart.fn(x => {
+        return dart.as(x, core.int);
+      }, core.int, [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFunction(42, dart.fn(x => {
+        return x;
+      }, core.int, [core.int]), 42);
+    }
+    testBlockArrow() {
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => {
+        return dart.fn(y => dart.as(dart.dsend(x, '+', y), core.int), core.int, [dart.dynamic]);
+      }, IntFunc, [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => {
+        return dart.as(dart.fn(y => dart.notNull(x) + dart.notNull(dart.as(y, core.num)), core.num, [dart.dynamic]), IntFunc);
+      }, IntFunc, [core.int]), 42);
+    }
+    testBlockBlock() {
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => {
+        return dart.fn(y => {
+          return dart.as(dart.dsend(x, '+', y), core.int);
+        }, core.int, [dart.dynamic]);
+      }, IntFunc, [dart.dynamic]), 42);
+      FunctionLiteralsTest.checkIntFuncFunction(84, dart.fn(x => {
+        return dart.fn(y => {
+          return dart.asInt(dart.notNull(x) + dart.notNull(dart.as(y, core.num)));
+        }, core.int, [dart.dynamic]);
+      }, IntFunc, [core.int]), 42);
+    }
+    testFunctionRef() {
+      FunctionLiteralsTest.checkIntFunction(42, dart.bind(this, 'func1'), 42);
+      FunctionLiteralsTest.checkIntFunction(42, dart.bind(this, 'func2'), 42);
+      FunctionLiteralsTest.checkIntFunction(42, dart.bind(this, 'func3'), 42);
+      FunctionLiteralsTest.checkIntFunction(42, dart.bind(this, 'func4'), 42);
+    }
+  }
+  dart.setSignature(FunctionLiteralsTest, {
+    constructors: () => ({FunctionLiteralsTest: [FunctionLiteralsTest, []]}),
+    methods: () => ({
+      func1: [core.int, [core.int]],
+      func2: [core.int, [dart.dynamic]],
+      func3: [core.int, [core.int]],
+      func4: [core.int, [dart.dynamic]],
+      testArrow: [dart.void, []],
+      testArrowArrow: [dart.void, []],
+      testArrowBlock: [dart.void, []],
+      testBlock: [dart.void, []],
+      testBlockArrow: [dart.void, []],
+      testBlockBlock: [dart.void, []],
+      testFunctionRef: [dart.void, []]
+    }),
+    statics: () => ({
+      checkIntFunction: [dart.void, [dart.dynamic, dart.functionType(core.int, [dart.dynamic]), dart.dynamic]],
+      checkIntFuncFunction: [dart.void, [dart.dynamic, dart.functionType(IntFunc, [dart.dynamic]), dart.dynamic]],
+      testMain: [dart.void, []]
+    }),
+    names: ['checkIntFunction', 'checkIntFuncFunction', 'testMain']
+  });
+  function main() {
+    FunctionLiteralsTest.testMain();
+  }
+  dart.fn(main);
+  const __CastType0 = dart.typedef('__CastType0', () => dart.functionType(IntFunc, [dart.dynamic]));
+  // Exports:
+  exports.IntFunc = IntFunc;
+  exports.FunctionLiteralsTest = FunctionLiteralsTest;
+  exports.main = main;
+});
 dart_library.library('language/function_propagation_test', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
@@ -72541,6 +72913,129 @@ dart_library.library('language/if_null_assignment_static_test_03_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
+dart_library.library('language/if_null_assignment_static_test_05_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+        (() => {
+          let t = super.b;
+          return t == null ? super.b = new A() : t;
+        })().a;
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
 dart_library.library('language/if_null_assignment_static_test_08_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
@@ -72787,6 +73282,129 @@ dart_library.library('language/if_null_assignment_static_test_10_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
+dart_library.library('language/if_null_assignment_static_test_12_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+      (() => {
+        let t = exports.b;
+        return t == null ? exports.b = new A() : t;
+      })().a;
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
 dart_library.library('language/if_null_assignment_static_test_15_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
@@ -72886,7 +73504,378 @@ dart_library.library('language/if_null_assignment_static_test_15_multi', null, /
     if (!dart.notNull(exports.checkedMode)) {
     }
     (() => {
-      let o = ClassWithStaticGetters, t = o.a;
+      let o = ClassWithStaticGetters, t = o.a;
+      return t == null ? o.a = new A() : t;
+    })().a;
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
+dart_library.library('language/if_null_assignment_static_test_17_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    (() => {
+      let o = ClassWithStaticGetters, t = o.a;
+      return t == null ? o.a = new B() : t;
+    })().a;
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
+dart_library.library('language/if_null_assignment_static_test_19_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+      (() => {
+        let o = ClassWithStaticGetters, t = o.b;
+        return t == null ? o.b = new A() : t;
+      })().a;
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
+dart_library.library('language/if_null_assignment_static_test_22_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    (() => {
+      let o = new ClassWithInstanceGetters(), t = o.a;
       return t == null ? o.a = new A() : t;
     })().a;
     if (!dart.notNull(exports.checkedMode)) {
@@ -72895,8 +73884,6 @@ dart_library.library('language/if_null_assignment_static_test_15_multi', null, /
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
-    if (!dart.notNull(exports.checkedMode)) {
-    }
   }
   dart.fn(main);
   // Exports:
@@ -72910,7 +73897,7 @@ dart_library.library('language/if_null_assignment_static_test_15_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
-dart_library.library('language/if_null_assignment_static_test_17_multi', null, /* Imports */[
+dart_library.library('language/if_null_assignment_static_test_24_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'expect/expect'
@@ -73008,8 +73995,10 @@ dart_library.library('language/if_null_assignment_static_test_17_multi', null, /
     new DerivedClass().derivedTest();
     if (!dart.notNull(exports.checkedMode)) {
     }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
     (() => {
-      let o = ClassWithStaticGetters, t = o.a;
+      let o = new ClassWithInstanceGetters(), t = o.a;
       return t == null ? o.a = new B() : t;
     })().a;
     if (!dart.notNull(exports.checkedMode)) {
@@ -73018,8 +74007,6 @@ dart_library.library('language/if_null_assignment_static_test_17_multi', null, /
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
-    if (!dart.notNull(exports.checkedMode)) {
-    }
   }
   dart.fn(main);
   // Exports:
@@ -73033,7 +74020,7 @@ dart_library.library('language/if_null_assignment_static_test_17_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
-dart_library.library('language/if_null_assignment_static_test_22_multi', null, /* Imports */[
+dart_library.library('language/if_null_assignment_static_test_26_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'expect/expect'
@@ -73133,11 +74120,11 @@ dart_library.library('language/if_null_assignment_static_test_22_multi', null, /
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
-    (() => {
-      let o = new ClassWithInstanceGetters(), t = o.a;
-      return t == null ? o.a = new A() : t;
-    })().a;
     if (!dart.notNull(exports.checkedMode)) {
+      (() => {
+        let o = new ClassWithInstanceGetters(), t = o.b;
+        return t == null ? o.b = new A() : t;
+      })().a;
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
@@ -73156,7 +74143,7 @@ dart_library.library('language/if_null_assignment_static_test_22_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
-dart_library.library('language/if_null_assignment_static_test_24_multi', null, /* Imports */[
+dart_library.library('language/if_null_assignment_static_test_29_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'expect/expect'
@@ -73256,12 +74243,12 @@ dart_library.library('language/if_null_assignment_static_test_24_multi', null, /
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
-    (() => {
-      let o = new ClassWithInstanceGetters(), t = o.a;
-      return t == null ? o.a = new B() : t;
-    })().a;
     if (!dart.notNull(exports.checkedMode)) {
     }
+    (() => {
+      let o = dart.list([null], A), i = 0, t = o[dartx.get](i);
+      return t == null ? o[dartx.set](i, new A()) : t;
+    })().a;
     if (!dart.notNull(exports.checkedMode)) {
     }
     if (!dart.notNull(exports.checkedMode)) {
@@ -73279,7 +74266,7 @@ dart_library.library('language/if_null_assignment_static_test_24_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
-dart_library.library('language/if_null_assignment_static_test_29_multi', null, /* Imports */[
+dart_library.library('language/if_null_assignment_static_test_31_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'expect/expect'
@@ -73383,7 +74370,7 @@ dart_library.library('language/if_null_assignment_static_test_29_multi', null, /
     }
     (() => {
       let o = dart.list([null], A), i = 0, t = o[dartx.get](i);
-      return t == null ? o[dartx.set](i, new A()) : t;
+      return t == null ? o[dartx.set](i, new B()) : t;
     })().a;
     if (!dart.notNull(exports.checkedMode)) {
     }
@@ -73402,7 +74389,7 @@ dart_library.library('language/if_null_assignment_static_test_29_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
-dart_library.library('language/if_null_assignment_static_test_31_multi', null, /* Imports */[
+dart_library.library('language/if_null_assignment_static_test_33_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'expect/expect'
@@ -73504,11 +74491,11 @@ dart_library.library('language/if_null_assignment_static_test_31_multi', null, /
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
-    (() => {
-      let o = dart.list([null], A), i = 0, t = o[dartx.get](i);
-      return t == null ? o[dartx.set](i, new B()) : t;
-    })().a;
     if (!dart.notNull(exports.checkedMode)) {
+      (() => {
+        let o = dart.list([null], B), i = 0, t = o[dartx.get](i);
+        return t == null ? o[dartx.set](i, new A()) : t;
+      })().a;
     }
     if (!dart.notNull(exports.checkedMode)) {
     }
@@ -73771,6 +74758,129 @@ dart_library.library('language/if_null_assignment_static_test_38_multi', null, /
   exports.DerivedClass = DerivedClass;
   exports.main = main;
 });
+dart_library.library('language/if_null_assignment_static_test_40_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core',
+  'expect/expect'
+], /* Lazy imports */[
+], function(exports, dart, core, expect) {
+  'use strict';
+  let dartx = dart.dartx;
+  dart.copyProperties(exports, {
+    get checkedMode() {
+      let checked = false;
+      dart.assert(checked = true);
+      return checked;
+    }
+  });
+  function noMethod(e) {
+    return dart.is(e, core.NoSuchMethodError);
+  }
+  dart.fn(noMethod);
+  function bad() {
+    expect.Expect.fail('Should not be executed');
+  }
+  dart.fn(bad);
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends A {
+    C() {
+      this.c = null;
+      super.A();
+    }
+  }
+  dart.copyProperties(exports, {
+    get a() {
+      return null;
+    },
+    set a(value) {},
+    get b() {
+      return null;
+    },
+    set b(value) {}
+  });
+  class ClassWithStaticGetters extends core.Object {
+    static get a() {
+      return null;
+    }
+    static set a(value) {}
+    static get b() {
+      return null;
+    }
+    static set b(value) {}
+  }
+  class ClassWithInstanceGetters extends core.Object {
+    get a() {
+      return null;
+    }
+    set a(value) {}
+    get b() {
+      return null;
+    }
+    set b(value) {}
+  }
+  class DerivedClass extends ClassWithInstanceGetters {
+    get a() {
+      return dart.as(bad(), A);
+    }
+    set a(value) {
+      bad();
+    }
+    get b() {
+      return dart.as(bad(), B);
+    }
+    set b(value) {
+      bad();
+    }
+    derivedTest() {
+      if (!dart.notNull(exports.checkedMode)) {
+      }
+    }
+  }
+  dart.setSignature(DerivedClass, {
+    methods: () => ({derivedTest: [dart.void, []]})
+  });
+  function main() {
+    let _ = null;
+    let t = _;
+    t == null ? _ = null : t;
+    new DerivedClass().derivedTest();
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+    }
+    if (!dart.notNull(exports.checkedMode)) {
+      (() => {
+        let o = new ClassWithInstanceGetters(), t = dart.nullSafe(o, _ => _.b);
+        return t == null ? (o == null ? null : o.b = new A()) : t;
+      })().a;
+    }
+  }
+  dart.fn(main);
+  // Exports:
+  exports.noMethod = noMethod;
+  exports.bad = bad;
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.ClassWithStaticGetters = ClassWithStaticGetters;
+  exports.ClassWithInstanceGetters = ClassWithInstanceGetters;
+  exports.DerivedClass = DerivedClass;
+  exports.main = main;
+});
 dart_library.library('language/if_null_assignment_static_test_none_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
@@ -140278,6 +141388,103 @@ dart_library.library('language/type_promotion_more_specific_test_03_multi', null
   exports.testInterface = testInterface;
   exports.testGeneric = testGeneric;
 });
+dart_library.library('language/type_promotion_more_specific_test_04_multi', null, /* Imports */[
+  'dart/_runtime',
+  'dart/core'
+], /* Lazy imports */[
+], function(exports, dart, core) {
+  'use strict';
+  let dartx = dart.dartx;
+  class A extends core.Object {
+    A() {
+      this.a = null;
+    }
+  }
+  class B extends A {
+    B() {
+      this.b = null;
+      super.A();
+    }
+  }
+  class C extends core.Object {
+    C() {
+      this.c = null;
+    }
+  }
+  const D$ = dart.generic(function(T) {
+    class D extends core.Object {
+      D(d) {
+        this.d = d;
+      }
+    }
+    dart.setSignature(D, {
+      constructors: () => ({D: [D$(T), [T]]})
+    });
+    return D;
+  });
+  let D = D$();
+  const E$ = dart.generic(function(T) {
+    class E extends D$(T) {
+      E(e) {
+        this.e = dart.as(e, T);
+        super.D(dart.as(e, T));
+      }
+    }
+    dart.setSignature(E, {
+      constructors: () => ({E: [E$(T), [dart.dynamic]]})
+    });
+    return E;
+  });
+  let E = E$();
+  function main() {
+    testInterface();
+    testGeneric();
+  }
+  dart.fn(main, dart.void, []);
+  function testInterface() {
+    let x = null;
+    let y = null;
+    let a = new B();
+    if (dart.is(a, B)) {
+    }
+    if (dart.is(a, C)) {
+    }
+    let b = new B();
+    if (dart.is(b, A)) {
+    }
+    if (dart.is(x, A)) {
+      y = dart.dload(x, 'b');
+    }
+  }
+  dart.fn(testInterface, dart.void, []);
+  function testGeneric() {
+    let x = null;
+    let y = null;
+    let d1 = new (E$(B))(null);
+    if (dart.is(d1, E)) {
+    }
+    if (dart.is(d1, E$(A))) {
+    }
+    let d2 = new (E$(B))(null);
+    if (dart.is(d2, E)) {
+    }
+    let d3 = new (E$(B))(new B());
+    if (dart.is(d3, E$(B))) {
+    }
+  }
+  dart.fn(testGeneric);
+  // Exports:
+  exports.A = A;
+  exports.B = B;
+  exports.C = C;
+  exports.D$ = D$;
+  exports.D = D;
+  exports.E$ = E$;
+  exports.E = E;
+  exports.main = main;
+  exports.testInterface = testInterface;
+  exports.testGeneric = testGeneric;
+});
 dart_library.library('language/type_promotion_more_specific_test_05_multi', null, /* Imports */[
   'dart/_runtime',
   'dart/core'
diff --git a/pkg/dev_compiler/test/codegen/expect/node_modules.js b/pkg/dev_compiler/test/codegen/expect/node_modules.js
new file mode 100644
index 000000000000..5590ecb00c2a
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/node_modules.js
@@ -0,0 +1,50 @@
+'use strict';
+let dart = require("dart/_runtime");
+let core = require("dart/core");
+let dartx = dart.dartx;
+const Callback = dart.typedef('Callback', () => dart.functionType(dart.void, [], {i: core.int}));
+class A extends core.Object {}
+class _A extends core.Object {}
+const B$ = dart.generic(function(T) {
+  class B extends core.Object {}
+  return B;
+});
+let B = B$();
+const _B$ = dart.generic(function(T) {
+  class _B extends core.Object {}
+  return _B;
+});
+let _B = _B$();
+function f() {
+}
+dart.fn(f);
+function _f() {
+}
+dart.fn(_f);
+const constant = "abc";
+exports.finalConstant = "abc";
+dart.defineLazyProperties(exports, {
+  get lazy() {
+    return dart.as(dart.fn(() => {
+      core.print('lazy');
+      return "abc";
+    })(), core.String);
+  }
+});
+exports.mutable = "abc";
+dart.defineLazyProperties(exports, {
+  get lazyMutable() {
+    return dart.as(dart.fn(() => {
+      core.print('lazyMutable');
+      return "abc";
+    })(), core.String);
+  },
+  set lazyMutable(_) {}
+});
+// Exports:
+exports.Callback = Callback;
+exports.A = A;
+exports.B$ = B$;
+exports.B = B;
+exports.f = f;
+exports.constant = constant;
diff --git a/pkg/dev_compiler/test/codegen/expect/node_modules.txt b/pkg/dev_compiler/test/codegen/expect/node_modules.txt
new file mode 100644
index 000000000000..314e2da1730d
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/expect/node_modules.txt
@@ -0,0 +1 @@
+// Messages from compiling node_modules.dart
diff --git a/pkg/dev_compiler/test/codegen/expect/sunflower/sunflower.html b/pkg/dev_compiler/test/codegen/expect/sunflower/sunflower.html
index 97335ad71257..f83c57579f80 100644
--- a/pkg/dev_compiler/test/codegen/expect/sunflower/sunflower.html
+++ b/pkg/dev_compiler/test/codegen/expect/sunflower/sunflower.html
@@ -45,8 +45,8 @@ <h1>drfibonacci's Sunflower Spectacular</h1>
 <script src="../dev_compiler/runtime/dart/_js_mirrors.js"></script>
 <script src="../dev_compiler/runtime/dart/js.js"></script>
 <script src="../dev_compiler/runtime/dart/_metadata.js"></script>
-<script src="../dev_compiler/runtime/dart/html_common.js"></script>
 <script src="../dev_compiler/runtime/dart/html.js"></script>
+<script src="../dev_compiler/runtime/dart/html_common.js"></script>
 <script src="../dev_compiler/runtime/dart/_debugger.js"></script>
 <script src="circle.js"></script>
 <script src="../js/js.js"></script>
diff --git a/pkg/dev_compiler/test/codegen/node_modules.dart b/pkg/dev_compiler/test/codegen/node_modules.dart
new file mode 100644
index 000000000000..6370fdc26d93
--- /dev/null
+++ b/pkg/dev_compiler/test/codegen/node_modules.dart
@@ -0,0 +1,25 @@
+library test;
+
+import 'dart:js';
+
+typedef void Callback({int i});
+
+class A {}
+class _A {}
+class B<T> {}
+class _B<T> {}
+
+f() {}
+_f() {}
+
+const String constant = "abc";
+final String finalConstant = "abc";
+final String lazy = (() {
+  print('lazy');
+  return "abc";
+})();
+String mutable = "abc";
+String lazyMutable = (() {
+  print('lazyMutable');
+  return "abc";
+})();
diff --git a/pkg/dev_compiler/test/codegen_test.dart b/pkg/dev_compiler/test/codegen_test.dart
index fcb973b7288f..dd3ec981d138 100644
--- a/pkg/dev_compiler/test/codegen_test.dart
+++ b/pkg/dev_compiler/test/codegen_test.dart
@@ -153,7 +153,9 @@ $compilerMessages''';
           var closure = filename == 'closure';
           var moduleFormat = filename == 'es6_modules'
               ? ModuleFormat.es6
-              : ModuleFormat.legacy;
+              : filename == 'node_modules'
+                  ? ModuleFormat.node
+                  : ModuleFormat.legacy;
           var success;
           // TODO(vsm): Is it okay to reuse the same context here?  If there is
           // overlap between test files, we may need separate ones for each
diff --git a/pkg/dev_compiler/tool/input_sdk/lib/html/ddc/html_ddc.dart b/pkg/dev_compiler/tool/input_sdk/lib/html/ddc/html_ddc.dart
index a01c17e81de5..7c5c8510f38d 100644
--- a/pkg/dev_compiler/tool/input_sdk/lib/html/ddc/html_ddc.dart
+++ b/pkg/dev_compiler/tool/input_sdk/lib/html/ddc/html_ddc.dart
@@ -24,6 +24,7 @@
  */
 library dart.dom.html;
 
+import 'dart:_runtime' show global_;
 import 'dart:async';
 import 'dart:collection';
 import 'dart:_internal' hide Symbol;
@@ -4927,7 +4928,7 @@ class DocumentFragment extends Node implements ParentNode {
         treeSanitizer: treeSanitizer));
   }
 
-  /** 
+  /**
    * Alias for [querySelector]. Note this function is deprecated because its
    * semantics will be changing in the future.
    */
@@ -4938,7 +4939,7 @@ class DocumentFragment extends Node implements ParentNode {
     return querySelector(relativeSelectors);
   }
 
-  /** 
+  /**
    * Alias for [querySelectorAll]. Note this function is deprecated because its
    * semantics will be changing in the future.
    */
@@ -7605,7 +7606,7 @@ class Event extends DartHtmlDomObject {
     e._initEvent(name, canBubble, cancelable);
     return e;
   }
-  
+
   /** The CSS selector involved with event delegation. */
   String _selector;
 
@@ -7840,18 +7841,18 @@ class Events {
 class ElementEvents extends Events {
   /* Raw event target. */
   static final webkitEvents = {
-    'animationend' : 'webkitAnimationEnd', 
-    'animationiteration' : 'webkitAnimationIteration', 
-    'animationstart' : 'webkitAnimationStart', 
-    'fullscreenchange' : 'webkitfullscreenchange', 
+    'animationend' : 'webkitAnimationEnd',
+    'animationiteration' : 'webkitAnimationIteration',
+    'animationstart' : 'webkitAnimationStart',
+    'fullscreenchange' : 'webkitfullscreenchange',
     'fullscreenerror' : 'webkitfullscreenerror',
-    'keyadded' : 'webkitkeyadded', 
-    'keyerror' : 'webkitkeyerror', 
-    'keymessage' : 'webkitkeymessage', 
-    'needkey' : 'webkitneedkey', 
-    'pointerlockchange' : 'webkitpointerlockchange', 
-    'pointerlockerror' : 'webkitpointerlockerror', 
-    'resourcetimingbufferfull' : 'webkitresourcetimingbufferfull', 
+    'keyadded' : 'webkitkeyadded',
+    'keyerror' : 'webkitkeyerror',
+    'keymessage' : 'webkitkeymessage',
+    'needkey' : 'webkitneedkey',
+    'pointerlockchange' : 'webkitpointerlockchange',
+    'pointerlockerror' : 'webkitpointerlockerror',
+    'resourcetimingbufferfull' : 'webkitresourcetimingbufferfull',
     'transitionend': 'webkitTransitionEnd',
     'speechchange' : 'webkitSpeechChange'
   };
@@ -8681,7 +8682,7 @@ class HttpRequest extends HttpRequestEventTarget {
    *
    * By default `request` will perform an HTTP GET request, but a different
    * method (`POST`, `PUT`, `DELETE`, etc) can be used by specifying the
-   * [method] parameter. (See also [HttpRequest.postFormData] for `POST` 
+   * [method] parameter. (See also [HttpRequest.postFormData] for `POST`
    * requests only.
    *
    * The Future is completed when the response is available.
@@ -8690,8 +8691,8 @@ class HttpRequest extends HttpRequestEventTarget {
    * [Blob], [Document], [String], or [FormData] along with the HttpRequest.
    *
    * If specified, [responseType] sets the desired response format for the
-   * request. By default it is [String], but can also be 'arraybuffer', 'blob', 
-   * 'document', 'json', or 'text'. See also [HttpRequest.responseType] 
+   * request. By default it is [String], but can also be 'arraybuffer', 'blob',
+   * 'document', 'json', or 'text'. See also [HttpRequest.responseType]
    * for more information.
    *
    * The [withCredentials] parameter specified that credentials such as a cookie
@@ -8774,7 +8775,7 @@ class HttpRequest extends HttpRequestEventTarget {
       // redirect case will be handled by the browser before it gets to us,
       // so if we see it we should pass it through to the user.
       var unknownRedirect = xhr.status > 307 && xhr.status < 400;
-      
+
       if (accepted || fileUri || notModified || unknownRedirect) {
         completer.complete(xhr);
       } else {
@@ -10634,15 +10635,15 @@ abstract class ButtonInputElement implements InputElementBase {
 @Native("KeyboardEvent")
 class KeyboardEvent extends UIEvent {
 
-  /** 
-   * Programmatically create a KeyboardEvent. 
+  /**
+   * Programmatically create a KeyboardEvent.
    *
    * Due to browser differences, keyCode, charCode, or keyIdentifier values
    * cannot be specified in this base level constructor. This constructor
    * enables the user to programmatically create and dispatch a [KeyboardEvent],
    * but it will not contain any particular key content. For programmatically
    * creating keyboard events with specific key value contents, see the custom
-   * Event [KeyEvent]. 
+   * Event [KeyEvent].
    */
   factory KeyboardEvent(String type,
       {Window view, bool canBubble: true, bool cancelable: true,
@@ -18577,7 +18578,7 @@ class FixedSizeListIterator<T> implements Iterator<T> {
   final int _length;  // Cache array length for faster access.
   int _position;
   T _current;
-  
+
   FixedSizeListIterator(List<T> array)
       : _array = array,
         _position = -1,
@@ -19036,14 +19037,13 @@ class KeyEvent extends _WrappedEvent implements KeyboardEvent {
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-
 class Platform {
   /**
    * Returns true if dart:typed_data types are supported on this
    * browser.  If false, using these types will generate a runtime
    * error.
    */
-  static final supportsTypedData = JS('bool', '!!(window.ArrayBuffer)');
+  static final supportsTypedData = JS('bool', '!!($global_.ArrayBuffer)');
 
   /**
    * Returns true if SIMD types in dart:typed_data types are supported
@@ -19555,7 +19555,8 @@ export 'dart:math' show Rectangle, Point;
  *
  *   * [Window](https://developer.mozilla.org/en-US/docs/Web/API/window) from MDN.
  */
-Window get window => wrap_jso(JS('', 'window'));
+
+final Window window = wrap_jso(JS('', '$global_'));
 
 /**
  * Root node for all content in a web page.
@@ -19798,4 +19799,3 @@ Function _getHtmlFunction(String key) {
   }
   return null;
 }
-
diff --git a/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/html_common_ddc.dart b/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/html_common_ddc.dart
index 33ea63035091..51b9b9137811 100644
--- a/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/html_common_ddc.dart
+++ b/pkg/dev_compiler/tool/input_sdk/lib/html/html_common/html_common_ddc.dart
@@ -23,4 +23,3 @@ part 'conversions_dart2js.dart';
 part 'device.dart';
 part 'filtered_element_list.dart';
 part 'lists.dart';
-
diff --git a/pkg/dev_compiler/tool/input_sdk/private/debugger.dart b/pkg/dev_compiler/tool/input_sdk/private/debugger.dart
index 88ad1ae55069..2a8a877824da 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/debugger.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/debugger.dart
@@ -18,8 +18,8 @@ final int maxIterableChildrenToDisplay = 50;
 
 var _devtoolsFormatter = new JsonMLFormatter(new DartFormatter());
 
-String typeof(object) => JS('String', 'typeof #', object);
-bool instanceof(object, clazz) => JS('bool', '# instanceof #', object, clazz);
+String _typeof(object) => JS('String', 'typeof #', object);
+bool _instanceof(object, clazz) => JS('bool', '# instanceof #', object, clazz);
 
 List<String> getOwnPropertyNames(object) =>
     dart.list(JS('List', 'Object.getOwnPropertyNames(#)', object), String);
@@ -37,14 +37,14 @@ class JSNative {
 }
 
 bool isRegularDartObject(object) {
-  if (typeof(object) == 'function') return false;
-  return instanceof(object, Object);
+  if (_typeof(object) == 'function') return false;
+  return _instanceof(object, Object);
 }
 
 String getObjectTypeName(object) {
   var realRuntimeType = dart.realRuntimeType(object);
   if (realRuntimeType == null) {
-    if (typeof(object) == 'function') {
+    if (_typeof(object) == 'function') {
       return '[[Raw JavaScript Function]]';
     }
     return '<Error getting type name>';
@@ -209,8 +209,8 @@ class JsonMLFormatter {
       var nameSpan = new JsonMLElement('span')
         ..createTextChild(child.name != null ? child.name + ': ' : '')
         ..setStyle('color: rgb(136, 19, 145);');
-      if (typeof(child.value) == 'object' ||
-          typeof(child.value) == 'function') {
+      if (_typeof(child.value) == 'object' ||
+          _typeof(child.value) == 'function') {
         nameSpan.addStyle("padding-left: 13px;");
 
         li.appendChild(nameSpan);
@@ -356,7 +356,7 @@ class ObjectFormatter extends Formatter {
 /// runtime type information.
 class FunctionFormatter extends Formatter {
   accept(object) {
-    if (typeof(object) != 'function') return false;
+    if (_typeof(object) != 'function') return false;
     return dart.realRuntimeType(object) != null;
   }
 
diff --git a/pkg/dev_compiler/tool/input_sdk/private/js_mirrors.dart b/pkg/dev_compiler/tool/input_sdk/private/js_mirrors.dart
index 41b9cbd5c38b..7b4647fc3486 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/js_mirrors.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/js_mirrors.dart
@@ -25,7 +25,6 @@ TypeMirror reflectType(Type key) {
 }
 
 final dynamic _dart = JS('', 'dart');
-final _metadata = JS('', '#.metadata', _dart);
 
 dynamic _dload(obj, String name) {
   return JS('', '#.dload(#, #)', _dart, obj, name);
diff --git a/pkg/dev_compiler/tool/input_sdk/private/runtime.dart b/pkg/dev_compiler/tool/input_sdk/private/runtime.dart
index 7035270b740c..061218b484e2 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/runtime.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/runtime.dart
@@ -31,7 +31,8 @@ final as_ = JS('', '$cast');
 @JSExportName('is')
 final is_ = JS('', '$instanceOf');
 
-final global = JS('', 'typeof window == "undefined" ? global : window');
+@JSExportName('global')
+final global_ = JS('', 'typeof window == "undefined" ? global : window');
 final JsSymbol = JS('', 'Symbol');
 
 // TODO(vsm): This is referenced (as init.globalState) from
diff --git a/pkg/dev_compiler/tool/input_sdk/private/types.dart b/pkg/dev_compiler/tool/input_sdk/private/types.dart
index d74be7190782..f825850dcf36 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/types.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/types.dart
@@ -57,7 +57,6 @@ final Void = JS('', '''
     toString() { return "void"; }
   }
 ''');
-
 @JSExportName('void')
 final voidR = JS('', 'new $Void()');
 
diff --git a/pkg/dev_compiler/tool/node_test.sh b/pkg/dev_compiler/tool/node_test.sh
new file mode 100755
index 000000000000..4adc07d58061
--- /dev/null
+++ b/pkg/dev_compiler/tool/node_test.sh
@@ -0,0 +1,39 @@
+#!/bin/bash
+set -e
+# switch to the root directory of dev_compiler
+cd $( dirname "${BASH_SOURCE[0]}" )/..
+
+output_dir=tmp/node
+[[ -d $output_dir ]] || mkdir -p $output_dir
+
+ddc_options=(
+  --destructure-named-params
+  --modules=node
+  -o $output_dir
+)
+node_harmony_options=(
+  --harmony
+  --harmony_destructuring
+  --harmony_default_parameters
+)
+function compile() {
+    ./bin/dartdevc.dart "${ddc_options[@]}" $1
+}
+function run() {
+  NODE_PATH=$output_dir \
+    node "${node_harmony_options[@]}" -e \
+    "require('dart/_isolate_helper').startRootIsolate(require('$1').main, []);"
+}
+
+# TODO(ochafik): Add full language tests (in separate Travis env/matrix config).
+
+echo "Compiling SDK for node to $output_dir"
+./tool/build_sdk.sh "${ddc_options[@]}"
+
+echo "Now compiling hello_dart_test"
+compile test/codegen/language/hello_dart_test.dart
+run hello_dart_test
+
+echo "Now compiling DeltaBlue"
+compile test/codegen/DeltaBlue.dart
+run DeltaBlue
diff --git a/pkg/dev_compiler/tool/presubmit.sh b/pkg/dev_compiler/tool/presubmit.sh
index 880ad50dc8f8..54308c101caa 100755
--- a/pkg/dev_compiler/tool/presubmit.sh
+++ b/pkg/dev_compiler/tool/presubmit.sh
@@ -4,5 +4,6 @@ DIR=$(dirname "${BASH_SOURCE[0]}")
 $DIR/build_sdk.sh
 $DIR/test.sh
 $DIR/browser_test.sh
+$DIR/node_test.sh
 $DIR/analyze.sh
 $DIR/format.sh
diff --git a/pkg/dev_compiler/tool/sdk_expected_errors.txt b/pkg/dev_compiler/tool/sdk_expected_errors.txt
index f8bd7e283c97..216c9f13b649 100644
--- a/pkg/dev_compiler/tool/sdk_expected_errors.txt
+++ b/pkg/dev_compiler/tool/sdk_expected_errors.txt
@@ -276,22 +276,22 @@ warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from (dynamic) → dynamic
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:js, line 359, col 12)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:js, line 405, col 12)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:js, line 410, col 12)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Type> (dart:_js_mirrors, line 127, col 31)
-severe: [AnalyzerMessage] The setter 'classes' is not defined for the class 'Node' (dart:html, line 5561, col 32)
-severe: [AnalyzerMessage] The method '_registerCustomElement' is not defined for the class 'HtmlDocument' (dart:html, line 8468, col 5)
-severe: [AnalyzerMessage] 14 positional arguments expected, but 18 found (dart:html, line 11030, col 185)
-severe: [AnalyzerMessage] The getter 'name' is not defined for the class 'Node' (dart:html, line 14662, col 32)
-severe: [AnalyzerMessage] The getter 'value' is not defined for the class 'Node' (dart:html, line 14674, col 34)
-severe: [INVALID_FIELD_OVERRIDE] Field declaration MutableRectangle<num>.left cannot be overridden in CssRect. (dart:html, line 15349, col 3)
-severe: [INVALID_FIELD_OVERRIDE] Field declaration MutableRectangle<num>.top cannot be overridden in CssRect. (dart:html, line 15351, col 3)
-severe: [AnalyzerMessage] The method 'matchesWithAncestors' is not defined for the class 'EventTarget' (dart:html, line 15948, col 31)
-severe: [AnalyzerMessage] The method 'matchesWithAncestors' is not defined for the class 'EventTarget' (dart:html, line 15972, col 31)
-severe: [AnalyzerMessage] Missing concrete implementation of 'EventTarget._addEventListener_1', 'EventTarget._removeEventListener_3', 'EventTarget._removeEventListener_1', 'EventTarget._removeEventListener_2' and 7 more (dart:html, line 18681, col 7)
-severe: [AnalyzerMessage] Missing concrete implementation of 'KeyboardEvent._getModifierState_1', 'Event._stopImmediatePropagation_1', setter 'DartHtmlDomObject.raw', 'Event._preventDefault_1' and 4 more (dart:html, line 18829, col 7)
-severe: [AnalyzerMessage] The method 'makeLeafDispatchRecord' is not defined for the class 'KeyEvent' (dart:html, line 18875, col 12)
-severe: [AnalyzerMessage] The method 'setDispatchProperty' is not defined for the class 'KeyEvent' (dart:html, line 18945, col 5)
-severe: [AnalyzerMessage] Undefined class 'DataTransfer' (dart:html, line 18989, col 3)
-severe: [AnalyzerMessage] The getter 'clipboardData' is not defined for the class 'KeyboardEvent' (dart:html, line 18989, col 45)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Type> (dart:_js_mirrors, line 126, col 31)
+severe: [AnalyzerMessage] The setter 'classes' is not defined for the class 'Node' (dart:html, line 5562, col 32)
+severe: [AnalyzerMessage] The method '_registerCustomElement' is not defined for the class 'HtmlDocument' (dart:html, line 8469, col 5)
+severe: [AnalyzerMessage] 14 positional arguments expected, but 18 found (dart:html, line 11031, col 185)
+severe: [AnalyzerMessage] The getter 'name' is not defined for the class 'Node' (dart:html, line 14663, col 32)
+severe: [AnalyzerMessage] The getter 'value' is not defined for the class 'Node' (dart:html, line 14675, col 34)
+severe: [INVALID_FIELD_OVERRIDE] Field declaration MutableRectangle<num>.left cannot be overridden in CssRect. (dart:html, line 15350, col 3)
+severe: [INVALID_FIELD_OVERRIDE] Field declaration MutableRectangle<num>.top cannot be overridden in CssRect. (dart:html, line 15352, col 3)
+severe: [AnalyzerMessage] The method 'matchesWithAncestors' is not defined for the class 'EventTarget' (dart:html, line 15949, col 31)
+severe: [AnalyzerMessage] The method 'matchesWithAncestors' is not defined for the class 'EventTarget' (dart:html, line 15973, col 31)
+severe: [AnalyzerMessage] Missing concrete implementation of 'EventTarget._addEventListener_1', 'EventTarget._removeEventListener_3', 'EventTarget._removeEventListener_1', 'EventTarget._removeEventListener_2' and 7 more (dart:html, line 18682, col 7)
+severe: [AnalyzerMessage] Missing concrete implementation of 'KeyboardEvent._getModifierState_1', 'Event._stopImmediatePropagation_1', setter 'DartHtmlDomObject.raw', 'Event._preventDefault_1' and 4 more (dart:html, line 18830, col 7)
+severe: [AnalyzerMessage] The method 'makeLeafDispatchRecord' is not defined for the class 'KeyEvent' (dart:html, line 18876, col 12)
+severe: [AnalyzerMessage] The method 'setDispatchProperty' is not defined for the class 'KeyEvent' (dart:html, line 18946, col 5)
+severe: [AnalyzerMessage] Undefined class 'DataTransfer' (dart:html, line 18990, col 3)
+severe: [AnalyzerMessage] The getter 'clipboardData' is not defined for the class 'KeyboardEvent' (dart:html, line 18990, col 45)
 severe: [AnalyzerMessage] Missing concrete implementation of getter 'DartHtmlDomObject.raw', 'Event._initEvent_1', 'Event._stopImmediatePropagation_1', setter 'DartHtmlDomObject.raw' and 2 more (dart:html, line 19063, col 7)
 severe: [AnalyzerMessage] Undefined class 'DataTransfer' (dart:html, line 19075, col 3)
 severe: [AnalyzerMessage] The getter 'clipboardData' is not defined for the class 'Event' (dart:html, line 19075, col 45)
@@ -299,12 +299,12 @@ severe: [AnalyzerMessage] The method 'matches' is not defined for the class 'Eve
 severe: [AnalyzerMessage] The getter 'parent' is not defined for the class 'EventTarget' (dart:html, line 19122, col 23)
 severe: [AnalyzerMessage] The getter 'parent' is not defined for the class 'EventTarget' (dart:html, line 19123, col 56)
 severe: [AnalyzerMessage] Directives must appear before any declarations (dart:html, line 19526, col 1)
-severe: [AnalyzerMessage] The name 'Entry' is not a type and cannot be used as a parameterized type (dart:html, line 19592, col 44)
-severe: [AnalyzerMessage] Expected to find ';' (dart:html, line 19643, col 48)
-severe: [AnalyzerMessage] Undefined name 'console' (dart:html, line 19658, col 5)
-severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19675, col 21)
-severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19676, col 23)
-severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19677, col 20)
+severe: [AnalyzerMessage] The name 'Entry' is not a type and cannot be used as a parameterized type (dart:html, line 19593, col 44)
+severe: [AnalyzerMessage] Expected to find ';' (dart:html, line 19644, col 48)
+severe: [AnalyzerMessage] Undefined name 'console' (dart:html, line 19659, col 5)
+severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19676, col 21)
+severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19677, col 23)
+severe: [AnalyzerMessage] Undefined name 'js' (dart:html, line 19678, col 20)
 severe: [AnalyzerMessage] The name 'File' is not defined and cannot be used in an 'is' expression (dart:html_common/conversions.dart, line 103, col 14)
 severe: [AnalyzerMessage] The name 'Blob' is not defined and cannot be used in an 'is' expression (dart:html_common/conversions.dart, line 104, col 14)
 severe: [AnalyzerMessage] The name 'FileList' is not defined and cannot be used in an 'is' expression (dart:html_common/conversions.dart, line 105, col 14)
@@ -326,41 +326,41 @@ severe: [INVALID_METHOD_OVERRIDE] Invalid override. The type of CssClassSetImpl.
 severe: [INVALID_METHOD_OVERRIDE] Invalid override. The type of CssClassSetImpl.difference ((Set<String>) → Set<String>) is not a subtype of Set<String>.difference ((Set<Object>) → Set<String>). (dart:html_common/css_class_set.dart, line 186, col 3)
 severe: [AnalyzerMessage] The argument type 'List<Node>' cannot be assigned to the parameter type 'Iterable<Element>' (dart:html_common/filtered_element_list.dart, line 34, col 25)
 severe: [STATIC_TYPE_ERROR] Type check failed: _childNodes (List<Node>) is not of type Iterable<Element> (dart:html_common/filtered_element_list.dart, line 34, col 25)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<dynamic> to Iterable<CssStyleDeclaration> (dart:html, line 839, col 46)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 4631, col 31)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 4876, col 21)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from (dynamic) → bool to (Element) → bool (dart:html, line 5272, col 41)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 5895, col 21)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 7421, col 31)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 7723, col 26)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Future<dynamic> to Future<String> (dart:html, line 8839, col 14)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 9760, col 28)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Node> (dart:html, line 11357, col 23)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11439, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11961, col 31)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11969, col 53)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (num) → void (dart:html, line 13026, col 35)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15200, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15203, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Element> (dart:html, line 15256, col 20)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15290, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15292, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15322, col 32)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15324, col 55)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from ElementList<dynamic> to Iterable<Element> (dart:html, line 15869, col 44)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Stream<dynamic> to Stream<T> (dart:html, line 15947, col 41)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Stream<dynamic> to Stream<T> (dart:html, line 15971, col 41)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 15986, col 12)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 15995, col 12)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 16065, col 44)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 16071, col 47)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from ElementList<dynamic> to Iterable<Element> (dart:html, line 16215, col 44)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18136, col 9)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Iterable<dynamic> to Iterable<CssStyleDeclaration> (dart:html, line 840, col 46)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 4632, col 31)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 4877, col 21)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from (dynamic) → bool to (Element) → bool (dart:html, line 5273, col 41)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Element> (dart:html, line 5896, col 21)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 7422, col 31)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 7724, col 26)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Future<dynamic> to Future<String> (dart:html, line 8840, col 14)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 9761, col 28)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to Iterable<Node> (dart:html, line 11358, col 23)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11440, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11962, col 31)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Node> (dart:html, line 11970, col 53)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (num) → void (dart:html, line 13027, col 35)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15201, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15204, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to List<Element> (dart:html, line 15257, col 20)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15291, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15293, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15323, col 32)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<String> (dart:html, line 15325, col 55)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from ElementList<dynamic> to Iterable<Element> (dart:html, line 15870, col 44)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Stream<dynamic> to Stream<T> (dart:html, line 15948, col 41)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from Stream<dynamic> to Stream<T> (dart:html, line 15972, col 41)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 15987, col 12)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from StreamSubscription<dynamic> to StreamSubscription<T> (dart:html, line 15996, col 12)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 16066, col 44)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to (Event) → dynamic (dart:html, line 16072, col 47)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from ElementList<dynamic> to Iterable<Element> (dart:html, line 16216, col 44)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18137, col 9)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18174, col 9)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18138, col 9)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18175, col 9)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18495, col 31)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18509, col 28)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<Node> (dart:html, line 18525, col 29)
-warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18540, col 20)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to Iterable<String> (dart:html, line 18176, col 9)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18496, col 31)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18510, col 28)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from List<dynamic> to List<Node> (dart:html, line 18526, col 29)
+warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from dynamic to E (dart:html, line 18541, col 20)
 warning: [DOWN_CAST_COMPOSITE] Unsound implicit cast from (String) → String to (Object) → String (dart:html_common/css_class_set.dart, line 148, col 44)