If you're using a shared React component repo in your App and want do do development on both you might run into the error below.
Uncaught Error: addComponentAsRefTo(...): Only a ReactOwner can have refs. You might be adding a ref to a component
that was not created inside a component's `render` method, or you have multiple copies of React loaded
(details: https://fb.me/react-refs-must-have-owner).
The following steps describe the npm link-ing hoops you'll have to jump through to get everything working correctly.