anchor.diff:    void initComponent(ReactComponent jsThis, ReactDartComponentInternal internal, ComponentStatics componentStatics) => zone.run(() {
       var redraw = () {
         if (internal.isMounted) {
  -        jsThis.setState(emptyJsMap);
  +        jsThis.setState(_emptyJsMap);
         }
       };
   
  
positive.code: import "package:js/js.dart";
  import 'package:js/js_util.dart' hide jsify;
  import "package:react/react.dart";
  import "package:react/react_client/js_interop_helpers.dart" show jsify;
  import 'package:react/react_client/react_interop.dart';
  import "package:react/react_dom.dart";
  import "package:react/react_dom_server.dart";
  
negative.code: 
  export 'package:react/react_client/react_interop.dart' show ReactElement, ReactJsComponentFactory;
  
  @Deprecated('4.0.0')
  final EmptyObject emptyJsMap = new EmptyObject();
  
  /// Type of [children] must be child or list of children, when child is [ReactElement] or [String]
  typedef ReactElement ReactComponentFactory(Map props, [dynamic children]);
  