**Do you want to request a *feature* or report a *bug*?**
bug.

**What is the current behavior?**
This addresses a bug in `enzyme`, https://github.com/airbnb/enzyme/issues/1683.

On [this line](https://github.com/facebook/react/blob/master/packages/react-test-renderer/src/ReactShallowRenderer.js#L110) `element.type()` invokes the SFC with `element` as the `this` value. I believe that this is needed for create-react-class components, but that there needs to be a separate branch for SFCs.

**What is the expected behavior?**
`this` inside a strict-mode SFC will be `undefined`, not the element.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
In all of React 0.13, 0.14, 15, and 16, this bug exists.

While the bug ideally will be fixed, I understand that it's highly unlikely that it would be backported to the 14/15 lines - but I can wrap around it if there's a reliable way, in those versions, to distinguish SFCs from create-react-class components (is there?).
}
      }
      
      if (beforeState !== this._newState) {
        this._instance.state = this._newState || emptyObject;
      }
    }
    this._rendered = this._instance.render();
    
    
  }
  _updateClassComponent(element, context) {
    const {props, type} = element;
    const oldState = this._instance.state || emptyObject;
    const oldProps = this._instance.props;
    if (oldProps !== props) {
      
      
      if (
        typeof element.type.getDerivedStateFromProps !== 'function' &&
        typeof this._instance.getSnapshotBeforeUpdate !== 'function'
      ) {
        if (typeof this._instance.componentWillReceiveProps === 'function') {
          this._instance.componentWillReceiveProps(props, context);
        }
        if (
          typeof this._instance.UNSAFE_componentWillReceiveProps === 'function'
        ) {
          this._instance.UNSAFE_componentWillReceiveProps(props, context);
        }