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Update EventEmitter.js (#23047)

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Summary:
added protection for emit() because subscription.listener may have been removed during event loop

Changelog:
----------

[GENERAL][FIX] Avoid crash when subscription listener may have been removed during event loop
Pull Request resolved: https://github.com/facebook/react-native/pull/23047

Differential Revision: D13761725

Pulled By: cpojer

fbshipit-source-id: 0753b780067bd712cd43caf63020c3f0d6ea9f52
This commit is contained in:
xianglinhe
2019-01-22 06:04:18 -08:00
committed by Facebook Github Bot
parent ec488dcf63
commit 47e77682d4
1 changed files with 1 additions and 1 deletions
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2
Libraries/vendor/emitter/EventEmitter.js vendored
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@@ -176,7 +176,7 @@ class EventEmitter {
const subscription = subscriptions[i];
// The subscription may have been removed during this event loop.
if (subscription) {
if (subscription && subscription.listener) {
this._currentSubscription = subscription;
subscription.listener.apply(
subscription.context,