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Fix babelHelpers.typeof is not a function

Summary:
We started encountering the error described in #5747 (`babelHelpers.typeof is not a function) after switching from npm to yarn. [This comment](#5747 (comment)) led to [this comment](#4844 (comment)) which contains a solution we've been using successfully in our production app.

Maybe I didn't look in the right place but it doesn't seem anyone had actually PR'd this change before (if so and I didn't find it, I apologize).

An alternative solution it seems is to add a [different .babelrc](http://stackoverflow.com/questions/35563025/new-react-native-app-has-typeerror-babelhelpers-typeof-is-not-a-function-ios), but this seems easier to me.
Closes #11093

Differential Revision: D4353977

fbshipit-source-id: 3e45de29ef5d0e046219a32df6530dcf838b9fd9
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cmcewen authored and facebook-github-bot committed Dec 20, 2016
1 parent 2f1d1bd commit ab89b7195d1eea1c096d4134fba3ec517580bbb3
Showing with 6 additions and 0 deletions.
  1. +6 −0 packager/react-packager/src/Resolver/polyfills/babelHelpers.js
@@ -19,6 +19,12 @@
var babelHelpers = global.babelHelpers = {};
babelHelpers.typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
return typeof obj;
} : function (obj) {
return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};
babelHelpers.createRawReactElement = (function () {
var REACT_ELEMENT_TYPE = typeof Symbol === "function" && Symbol.for && Symbol.for("react.element") || 0xeac7;
return function createRawReactElement(type, key, props) {

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