anchor.diff:    final num charCode;
   
     SyntheticKeyboardEvent(
  -      bubbles,
  -      cancelable,
  -      currentTarget,
  -      _defaultPrevented,
  -      _preventDefault,
  -      stopPropagation,
  -      eventPhase,
  -      isTrusted,
  -      nativeEvent,
  -      target,
  -      timeStamp,
  -      type,
  -      this.altKey,
  -      this.char,
  -      this.charCode,
  -      this.ctrlKey,
  -      this.locale,
  -      this.location,
  -      this.key,
  -      this.keyCode,
  -      this.metaKey,
  -      this.repeat,
  -      this.shiftKey)
  -      : super(
  +    bool bubbles,
  +    bool cancelable,
  +    bool currentTarget,
  +    bool _defaultPrevented,
  +    dynamic _preventDefault,
  +    dynamic stopPropagation,
  +    num eventPhase,
  +    bool isTrusted,
  +    dynamic nativeEvent,
  +    dynamic target,
  +    num timeStamp,
  +    String type,
  +    this.altKey,
  +    this.char,
  +    this.charCode,
  +    this.ctrlKey,
  +    this.locale,
  +    this.location,
  +    this.key,
  +    this.keyCode,
  +    this.metaKey,
  +    this.repeat,
  +    this.shiftKey,
  +  ) : super(
               bubbles,
               cancelable,
               currentTarget,
  
positive.code:   final /*DOMAbstractView*/ view;
  
    SyntheticUIEvent(
        bubbles,
        cancelable,
        currentTarget,
        _defaultPrevented,
        _preventDefault,
        stopPropagation,
        eventPhase,
        isTrusted,
        nativeEvent,
        target,
        timeStamp,
        type,
        this.detail,
        this.view)
        : super(
              bubbles,
              cancelable,
              currentTarget,
  
negative.code:   final clipboardData;
  
    SyntheticClipboardEvent(
      bool bubbles,
      bool cancelable,
      bool currentTarget,
      bool _defaultPrevented,
      dynamic _preventDefault,
      dynamic stopPropagation,
      num eventPhase,
      bool isTrusted,
      dynamic nativeEvent,
      dynamic target,
      num timeStamp,
      String type,
      this.clipboardData,
    ) : super(
              bubbles,
              cancelable,
              currentTarget,
  