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Summary: `BackAndroid.addEventListener()` returns a subscription object with a `remove()` function in android. Before this fix, the iOS equivalent doesn't return anything, which means, if there's a component doing something like this, it would redbox: ``` componentWillMount() { this._subscription = BackAndroid.addEventListener('hardwareBackPress', () => {...}); } componentWillUnmount() { this._subscription.remove(); // --> redbox in iOS before this fix } ``` Differential Revision: D3790480 fbshipit-source-id: 1e607171bf2892a6b64977c4fd052c5df0bc4a0d
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