Summary:
It took me a few timeslots of my life to figure out how to make this work. First, I tried to break into 2 files. The app export made no sense to me. But after doing that, I discover a invalid token, the return() was not supposed to be there. So I fixed the sample.
Closes https://github.com/facebook/react-native/pull/9802
Differential Revision: D3841320
Pulled By: mkonicek
fbshipit-source-id: 999227ee1c234b92d34844c2370ef654116b6a1d