Wrapperless dart:html and friends

lib/runtime/dart/js.js

 dart_library.library('dart/js', null, /* Imports */[
   'dart/_runtime',
   'dart/core',
   'dart/collection',
   'dart/_js_helper'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   const _global = dart.global;
@@ skipping 30 matching lines @@
     }
     static _convertDataTree(data) {
       let _convertedObjects = collection.HashMap.identity();
       function _convert(o) {
         if (dart.notNull(_convertedObjects.containsKey(o))) {
           return _convertedObjects.get(o);
         }
         if (dart.is(o, core.Map)) {
           let convertedMap = {};
           _convertedObjects.set(o, convertedMap);
-          for (let key of o.keys) {
-            convertedMap[key] = _convert(o.get(key));
+          for (let key of o[dartx.keys]) {
+            convertedMap[key] = _convert(o[dartx.get](key));
           }
           return convertedMap;
         } else if (dart.is(o, core.Iterable)) {
           let convertedList = [];
           _convertedObjects.set(o, convertedList);
           convertedList[dartx.addAll](o[dartx.map](_convert));
           return convertedList;
         } else {
           return _convertToJS(o);
         }
@@ skipping 345 matching lines @@
   });
   let __CastType0 = __CastType0$();
   // Exports:
   exports.JsObject = JsObject;
   exports.JsFunction = JsFunction;
   exports.JsArray$ = JsArray$;
   exports.JsArray = JsArray;
   exports.allowInterop = allowInterop;
   exports.allowInteropCaptureThis = allowInteropCaptureThis;
 });