Generate all runtime files from dart.

lib/runtime/dart/_js_helper.js

 dart_library.library('dart/_js_helper', null, /* Imports */[
   "dart/_runtime",
   'dart/core',
   'dart/collection',
+  'dart/_utils',
   'dart/_interceptors',
   'dart/_foreign_helper'
 ], /* Lazy imports */[
-], function(exports, dart, core, collection, _interceptors, _foreign_helper) {
+], function(exports, dart, core, collection, utils, _interceptors, _foreign_helper) {
   'use strict';
   let dartx = dart.dartx;
   class NoThrows extends core.Object {
     NoThrows() {
     }
   }
   dart.setSignature(NoThrows, {
     constructors: () => ({NoThrows: [NoThrows, []]})
   });
   class NoInline extends core.Object {
@@ skipping 474 matching lines @@
   dart.fn(stringReplaceFirstUnchecked, dart.dynamic, [dart.dynamic, dart.dynamic, dart.dynamic], [core.int]);
   function stringJoinUnchecked(array, separator) {
     return array.join(separator);
   }
   dart.fn(stringJoinUnchecked);
   function getRuntimeType(object) {
     return dart.as(dart.realRuntimeType(object), core.Type);
   }
   dart.fn(getRuntimeType, core.Type, [dart.dynamic]);
   function getIndex(array, index) {
-    dart.assert(isJsArray(array));
+    utils.assert(isJsArray(array));
     return array[index];
   }
   dart.fn(getIndex, dart.dynamic, [dart.dynamic, core.int]);
   function getLength(array) {
-    dart.assert(isJsArray(array));
+    utils.assert(isJsArray(array));
     return array.length;
   }
   dart.fn(getLength, core.int, [dart.dynamic]);
   function isJsArray(value) {
     return dart.is(value, _interceptors.JSArray);
   }
   dart.fn(isJsArray, core.bool, [dart.dynamic]);
   class _Patch extends core.Object {
     _Patch() {
     }
@@ skipping 674 matching lines @@
   exports.CastErrorImplementation = CastErrorImplementation;
   exports.FallThroughErrorImplementation = FallThroughErrorImplementation;
   exports.RuntimeError = RuntimeError;
   exports.random64 = random64;
   exports.jsonEncodeNative = jsonEncodeNative;
   exports.SyncIterator$ = SyncIterator$;
   exports.SyncIterator = SyncIterator;
   exports.SyncIterable$ = SyncIterable$;
   exports.SyncIterable = SyncIterable;
 });