block1.jsx

export class InjectorComponent extends React.Component {
  render() {
    const propsToPass = computePropsToPass(this.props)

    // cloneElement requires a single child, no arrays
    const Child = React.Children.only(this.props.children)

    // does not render anything additional to Child
    return React.cloneElement(Child, propsToPass)
  }
}

// Used later like...

<InjectorComponent
  something={something}
  another='another'
>
  <ChildToInjectTo />
</InjectorComponent>