sonaye 160b1c8ee5 Support for defineEnumerableProperties
Summary:
**Motivation**
detailed in #12702.

**Test plan**
1) running [a piece of code](https://github.com/mobxjs/mobx/issues/839#issuecomment-284153126) that utilizes the helper without any modifications on the react native package results an error being thrown.

![b589a71c-0041-11e7-9d47-cb79efff3ba5](https://cloud.githubusercontent.com/assets/23000873/23579517/3c8fe992-0100-11e7-9eb5-93c47f3df3e0.png)

2) updating the list of helpers available by adding the definition of `defineEnumerableProperties` as provided by babel [babel/babel/packages/babel-helpers/src/helpers.js](https://github.com/babel/babel/blob/master/packages/babel-helpers/src/helpers.js#L275-L285) results no errors.

![kapture 2017-03-04 at 16 48 35](https://cloud.githubusercontent.com/assets/23000873/23579520/457b8ca0-0100-11e7-8ca4-c704c6e9631f.gif)
Closes https://github.com/facebook/react-native/pull/12703

Differential Revision: D4658120

Pulled By: ericvicenti

fbshipit-source-id: 914aed4d313b3cc4f7ab99049d05d0aef269a3be
2017-03-06 16:15:40 -08:00
..
2017-02-28 09:00:42 -08:00
2017-03-01 08:15:51 -08:00
2017-03-01 08:15:51 -08:00
2017-02-27 14:04:57 -08:00