block8.jsx

class Cloning_ extends React.Component {
  render() {
    const { children, ...propsToPass } = this.props
    const child = React.Children.only(children)

    console.log('childProps: ', child.props)

    const clone = React.cloneElement(child, propsToPass)
    console.log('cloneProps: ', clone.props)

    return clone
  }
}

export default class App extends React.Component {
  render() {
    return (
      <div >
        <Cloning_ hi='bye'>
          <Div hi='hi' />
        </Cloning_>
      </div>
    )
  }
}