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Summary: Turns out, even after discussion that was had in https://github.com/facebook/react-native/pull/5294#issuecomment-174397103, we really do need this transform. I've just included it in the preset...let me know if you all would rather publish to npm. The actual reason why this is necessary is because in the latest sync from FB, fbjs was updated to use the `Symbol.iterator` express in it's isEmpty function: https://github.com/facebook/fbjs/commit/064a484e18b03f988f9eb540255ef8d742301c8d We use this in RN in the ListView...and this change (once #5084 is merged) will cause ListView to break on older JSC context's. This resolves that, and is probably something we should have had all along. Closes https://github.com/facebook/react-native/pull/5824 Reviewed By: svcscm Differential Revision: D2913315 Pulled By: vjeux fb-gh-sync-id: abaf484a9431b3111e8118d01db8d2c0d2dd73ca shipit-source-id: abaf484a9431b3111e8118d01db8d2c0d2dd73ca