React wrapper for setTimeout ⏲

Timer.js

import React, { PureComponent, PropTypes } from 'react';

export default class Timer extends PureComponent {
  static propTypes = {
    interval: PropTypes.number,
    onExpiry: PropTypes.func
  };

  constructor(props) {
    super(props);
    this.state = {
      timer: setTimeout(props.onExpiry, props.interval)
    };
  }

  componentWillUnmount() {
    clearTimeout(this.state.timer);
  }

  render() {
    return null;
  }
}