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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