module.exports = React.createClass({
  
  componentWillEnter(cb) {
    doSomeAsyncAnimationStuff(function() {
      cb();
    });
  },
  
  componentDidEnter() {
    // Called after cb arg from componentWillEnter is called
  },
  
  componentWillLeave(cb) {
    doSomeAsyncAnimationStuff(function() {
      // Call the callback when your done or this component will never unmount 
      // and your app will break
      cb();
    });
  },
  
  componentDidLeave() {
    // Called after cb arg from componentWillLeave is called
    // The component will be unmounted but you can clean things up here
  },
  
  render: function() {
    return (
      <div>Hey now</div>
    );
  }
});