React stateless components with lifecycle proposal

HelloMessage.js

const HelloMessage = props => <div>Hello {props.name}</div>

HelloMessage.intialState = { isMounted: false }

const focusAfterAfterOneSec = el => {
  setTimeout(() => {
    if (!isMounted) return;
    el.focus();
  }, 1000);
}

HelloMessage.componentDidMount = componentInstance => {
  componentInstance.setState({ isMounted: true})
  const el = ReactDOM.findDOMNode(componentInstance)
  focusAfterAfterOneSec(el)
}

HelloMessage.componentWillUnmount = componentInstance => {
  componentInstance.setState({ isMounted: false})
}