initial sync*, part of #221

lib/runtime/dart/js.js

 dart_library.library('dart/js', null, /* Imports */[
   "dart_runtime/dart",
   'dart/core',
   'dart/collection',
   'dart/_js_helper'
 ], /* Lazy imports */[
 ], function(exports, dart, core, collection, _js_helper) {
   'use strict';
   let dartx = dart.dartx;
   dart.defineLazyProperties(exports, {
@@ skipping 23 matching lines @@
       return dart.as(_wrapToDart(_convertToJS(object)), JsObject);
     }
     static jsify(object) {
       if (!dart.is(object, core.Map) && !dart.is(object, core.Iterable)) {
         throw new core.ArgumentError("object must be a Map or Iterable");
       }
       return dart.as(_wrapToDart(JsObject._convertDataTree(object)), JsObject);
     }
     static _convertDataTree(data) {
       let _convertedObjects = collection.HashMap.identity();
-      let _convert = o => {
+      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 dart.as(dart.dload(o, 'keys'), core.Iterable)) {
             convertedMap[key] = _convert(dart.dindex(o, key));
           }
           return convertedMap;
         } else if (dart.is(o, core.Iterable)) {
           let convertedList = [];
           _convertedObjects.set(o, convertedList);
           convertedList[dartx.addAll](dart.as(dart.dsend(o, 'map', _convert), core.Iterable));
           return convertedList;
         } else {
           return _convertToJS(o);
         }
-      };
+      }
       dart.fn(_convert);
       return _convert(data);
     }
     get(property) {
       if (!(typeof property == 'string') && !dart.is(property, core.num)) {
         throw new core.ArgumentError("property is not a String or num");
       }
       return _convertToDart(this[_jsObject][property]);
     }
     set(property, value) {
@@ skipping 318 matching lines @@
     let __CastType0 = dart.typedef('__CastType0', () => dart.functionType(dart.dynamic, [E]));
     return __CastType0;
   });
   let __CastType0 = __CastType0$();
   // Exports:
   exports.JsObject = JsObject;
   exports.JsFunction = JsFunction;
   exports.JsArray$ = JsArray$;
   exports.JsArray = JsArray;
 });