Generate all runtime files from dart.

tool/input_sdk/private/foreign_helper.dart

 // Copyright (c) 2012, 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._foreign_helper;
 
 /**
  * Emits a JavaScript code fragment parameterized by arguments.
  *
  * Hash characters `#` in the [codeTemplate] are replaced in left-to-right order
@@ skipping 92 matching lines @@
  * types, or including effects to allow the compiler to perform more
  * optimizations around the code.  This might be an extension of [JS] or a new
  * function similar to [JS] with additional arguments for the new information.
  */
 // Add additional optional arguments if needed. The method is treated internally
 // as a variable argument method.
 JS(String typeDescription, String codeTemplate,
     [arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9, arg10, arg11])
 {}
 
+/// Annotates the compiled Js name for fields and methods.
+/// Similar behaviour to `JS` from `package:js/js.dart` (but usable from runtime
+/// files), and not to be confused with `JSName` from `js_helper` (which deals
+/// with names of externs).
+class JsName {
+  final String name;
+  const JsName(this.name);
+}
+
 /**
  * Returns the isolate in which this code is running.
  */
 IsolateContext JS_CURRENT_ISOLATE_CONTEXT() {}
 
 abstract class IsolateContext {
   /// Holds a (native) JavaScript instance of Isolate, see
   /// finishIsolateConstructorFunction in emitter.dart.
   get isolateStatics;
 }
@@ skipping 142 matching lines @@
 }
 
 /**
  * JavaScript string concatenation. Inputs must be Strings.  Corresponds to the
  * HStringConcat SSA instruction and may be constant-folded.
  */
 String JS_STRING_CONCAT(String a, String b) {
   // This body is unused, only here for type analysis.
   return JS('String', '# + #', a, b);
 }
+
+/// Same `@rest` annotation and `spread` function as in
+/// `package:js/src/varargs.dart`.
+///
+/// Runtime files cannot import packages, which is why we have an ad-hoc copy.
+
+class _Rest {
+  const _Rest();
+}
+
+const _Rest rest = const _Rest();
+
+dynamic spread(args) {
+  throw new StateError(
+      'The spread function cannot be called, '
+      'it should be compiled away.');
+}
+
+/// This is a compiler intrinsic that gets expanded to the provided type's
+/// generic constructor (`genericTypeConstructor(Foo)` gives `foolib.Foo$`).
+genericTypeConstructor(type) {
+  throw new StateError(
+      'This function cannot be called, '
+      'it should be compiled away.');
+}