anchor.diff:    return wrapWithJsify ? jsifyAndAllowInterop(propsForJs) : propsForJs.jsObject;
   }
   
  -
   void _convertRefValue2(Map args, {bool convertCallbackRefValue = true}) {
     var ref = args['ref'];
   
  
positive.code: 
    /// Returns a JavaScript version of the specified [props], preprocessed for consumption by ReactJS and prepared for
    /// consumption by the [react] library internals.
    static JsMap generateExtendedJsProps(Map props) => _generateJsProps(props, convertEventHandlers: false, wrapWithJsify: false);
  }
  
  /// Converts a list of variadic children arguments to children that should be passed to ReactJS.
  
negative.code:     throw new Exception('Loaded react.js must include react-dart JS interop helpers.');
    }
  
    setReactConfiguration(_reactDom, _registerComponent,
        customRegisterComponent2: _registerComponent2, customRegisterFunctionComponent: _registerFunctionComponent);
    setReactDOMConfiguration(ReactDom.render, ReactDom.unmountComponentAtNode, _findDomNode);
    // Accessing ReactDomServer.renderToString when it's not available breaks in DDC.
    if (context['ReactDOMServer'] != null) {
  