var TransitionGroup = require('directions-transition-group');

// Wrap your element

<TransitionGroup name="slide" ref="tg">
  <RouteHandler />
</TransitionGroup>

// Assign data-direction attribute

<a href="#next" data-direction="forward">Next</a> //will add .slide-direction-forward class when animating elements
<Link to="step-one" data-direction="whatever">Back</Link> //will add .slide-direction-whatever class when animating elements

// "API"
this.refs.tg.setDirection("swap");