Generate all runtime files from dart.

tool/input_sdk/private/utils.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 library dart._utils;
 
-import 'dart:_foreign_helper' show JS;
+import 'dart:_foreign_helper' show JS, JsName;
 
 /// This library defines a set of general javascript utilities for us
 /// by the Dart runtime.
 // TODO(ochafik): Rewrite some of these in Dart when possible.
 
 final defineProperty = JS('', 'Object.defineProperty');
 final getOwnPropertyDescriptor = JS('', 'Object.getOwnPropertyDescriptor');
 final getOwnPropertyNames = JS('', 'Object.getOwnPropertyNames');
 final getOwnPropertySymbols = JS('', 'Object.getOwnPropertySymbols');
 
 final hasOwnProperty = JS('', 'Object.prototype.hasOwnProperty');
 
 // TODO(ochafik): Add ES6 class syntax support to JS intrinsics to avoid this.
 final StrongModeError = JS('', '''(function() {
   function StrongModeError(message) {
     Error.call(this);
     this.message = message;
   };
   Object.setPrototypeOf(StrongModeError.prototype, Error.prototype);
   return StrongModeError;
 })()''');
 
 /// This error indicates a strong mode specific failure.
 void throwStrongModeError(String message) => JS('', '''(() => {
-  throw new StrongModeError($message);
+  throw new $StrongModeError($message);
 })()''');
 
 /// This error indicates a bug in the runtime or the compiler.
 void throwInternalError(String message) => JS('', '''(() => {
   throw Error($message);
 })()''');
 
-// TODO(ochafik): Re-introduce a @JS annotation in the SDK (same as package:js)
-// so that this is named 'assert' in JavaScript.
+@JsName('assert')
 void assert_(bool condition) => JS('', '''(() => {
-  if (!condition) throwInternalError("The compiler is broken: failed assert");
+  if (!$condition) $throwInternalError("The compiler is broken: failed assert");
 })()''');
 
 getOwnNamesAndSymbols(obj) => JS('', '''(() => {
-  return getOwnPropertyNames(obj).concat(getOwnPropertySymbols(obj));
+  return $getOwnPropertyNames($obj).concat($getOwnPropertySymbols($obj));
 })()''');
 
 safeGetOwnProperty(obj, String name) => JS('', '''(() => {
-  let desc = getOwnPropertyDescriptor($obj, $name);
+  let desc = $getOwnPropertyDescriptor($obj, $name);
   if (desc) return desc.value;
 })()''');
 
 /// Defines a lazy property.
 /// After initial get or set, it will replace itself with a value property.
 // TODO(jmesserly): reusing descriptor objects has been shown to improve
 // performance in other projects (e.g. webcomponents.js ShadowDOM polyfill).
 defineLazyProperty(to, name, desc) => JS('', '''(() => {
   let init = $desc.get;
     let value = null;
 
     function lazySetter(x) {
       init = null;
       value = x;
     }
     function circularInitError() {
-      throwInternalError('circular initialization for field ' + $name);
+      $throwInternalError('circular initialization for field ' + $name);
     }
     function lazyGetter() {
       if (init == null) return value;
 
       // Compute and store the value, guarding against reentry.
       let f = init;
       init = circularInitError;
       lazySetter(f());
       return value;
     }
     $desc.get = lazyGetter;
     $desc.configurable = true;
     if ($desc.set) $desc.set = lazySetter;
-    return defineProperty($to, $name, $desc);
+    return $defineProperty($to, $name, $desc);
 })()''');
 
 void defineLazy(to, from) => JS('', '''(() => {
-  for (let name of getOwnNamesAndSymbols($from)) {
-    defineLazyProperty($to, name, getOwnPropertyDescriptor($from, name));
+  for (let name of $getOwnNamesAndSymbols($from)) {
+    $defineLazyProperty($to, name, $getOwnPropertyDescriptor($from, name));
   }
 })()''');
 
 defineMemoizedGetter(obj, String name, getter) => JS('', '''(() => {
-  return defineLazyProperty($obj, $name, {get: $getter});
+  return $defineLazyProperty($obj, $name, {get: $getter});
 })()''');
 
 copyTheseProperties(to, from, names) => JS('', '''(() => {
   for (let name of $names) {
     var desc = $getOwnPropertyDescriptor($from, name);
     if (desc != void 0) {
-      defineProperty($to, name, desc);
+      $defineProperty($to, name, desc);
     } else {
-      defineLazyProperty($to, name, () => $from[name]);
+      $defineLazyProperty($to, name, () => $from[name]);
     }
   }
   return $to;
 })()''');
 
 /// Copy properties from source to destination object.
 /// This operation is commonly called `mixin` in JS.
 copyProperties(to, from) => JS('', '''(() => {
-  return $copyTheseProperties($to, $from, $getOwnNamesAndSymbols(from));
+  return $copyTheseProperties($to, $from, $getOwnNamesAndSymbols($from));
 })()''');
 
 /// Exports from one Dart module to another.
-// TODO(ochafik): Re-introduce a @JS annotation in the SDK (same as package:js)
-// so that this is named 'export' in JavaScript.
+@JsName('export')
 export_(to, from, show, hide) => JS('', '''(() => {
   if ($show == void 0 || $show.length == 0) {
     $show = $getOwnNamesAndSymbols($from);
   }
   if ($hide != void 0) {
     var hideMap = new Set($hide);
     $show = $show.filter((k) => !hideMap.has(k));
   }
   return $copyTheseProperties($to, $from, $show);
 })()''');