An alternative method of defining a React component in ES6, mixing ideas from Crockford's better parts and https://gist.github.com/jquense/47bbd2613e0b03d7e51c

alternativeES6ReactComponent.js

'use strict';

import React from 'react';
import assign from 'object-assign';

export default function Notification(props, context) {
  const propTypes = {
    messsage: React.PropTypes.string,
    autoHide: React.PropTypes.bool,
    isOpen: React.PropTypes.bool,
  };
  const defaultProps = {
    message: '',
    autoHide: false,
    isOpen: false,
  };

  function privateMethod() {
    // do something privately
  }

  function render() {
    let html = (
      <div className="notification">
        {this.props.message}
      </div>
    );
    
    return this.props.isOpen
      ? html
      : false;
  }

  return assign({}, React.Component.prototype, {
    props,
    propTypes,
    defaultProps,
    context,
    render,
  });
}