anchor.diff:    /// Force a call to [render] by calling [setState], which effectively "redraws" the `Component`.
     ///
     /// Optionally accepts a [callback] that gets called after the component updates.
  -  ///
  -  /// > __DEPRECATED.__
  -  /// >
  -  /// > There is no implementation of this within [Component2]. Use [Component2.forceUpdate] when migrating.
  -  @Deprecated('6.0.0')
     void redraw([callback()]) {
       setState({}, callback);
     }
  
positive.code:   /// Also allows [newState] to be used as a transactional `setState` callback.
    ///
    /// See: <https://facebook.github.io/react/docs/react-component.html#setstate>
    ///
    /// > __DEPRECATED.__
    /// >
    /// > Note that when migrating to [Component2], [Component2.setState] will only accept a `Map` for [newState].
    /// > Transactional `setState` calls will have to be changed to utilize [Component2.setStateWithUpdater].
    @Deprecated('6.0.0')
    void setState(covariant dynamic newState, [callback()]) {
      if (newState is Map) {
        _nextState.addAll(newState);
  
negative.code:   /// Calling [setState] within this function will not trigger an additional [render].
    ///
    /// See: <https://facebook.github.io/react/docs/react-component.html#updating-componentwillreceiveprops>
    /// > __UNSUPPORTED IN COMPONENT2__
    /// >
    /// > This will be removed once 6.0.0 releases; switching to [Component2.getDerivedStateFromProps] is the path forward.
    /// >
    /// > This will be completely removed when the JS side of it is slated for removal (ReactJS 17 / react.dart 6.0.0)
    void componentWillReceiveProps(Map newProps) {}
  
    /// > __UNSUPPORTED IN COMPONENT2__
    /// >
    /// > This API was never stable in any version of ReactJS, and was replaced with a new, incompatible context API
    /// > in ReactJS 16 that is exposed via the [Component2] class.
    /// >
    /// > This will be completely removed when the JS side of it is slated for removal (ReactJS 17 / react.dart 6.0.0)
    void componentWillReceivePropsWithContext(Map newProps, Map nextContext) {}
  
    /// ReactJS lifecycle method that is invoked before rendering when [nextProps] or [nextState] are being received.
  