setTimeout handler is not called

[haggholm]

Issue Description

A piece of our network logic involves a delay to collect WS messages for batch sends. The relevant code looks like this:

if (!currentBatchPromise) {
	logger.debug('Enqueueing new batch promise');
	currentBatchPromise = new Promise((resolve, reject) =>
		setTimeout(() => sendCurrentBatch(resolve, reject), 10)
	);
}

Most of the time, this works fine. However, sometimes the timeout handler (sendCurrentBatch) is never invoked. Typically, this happens when transitioning between different screens; I’m not sure which project this bug should be filed under: RN or RNN? I have a vague suspicion that it might be something like facebook/react-native#22089 (“Timers do not run if specified before App mounts”), compounded by the fact that (if I understand correctly) RNN, on some level, creates more than one “app”. I do not know the details.

But it seems very…wrong…that a function like setTimeout can somehow stop working in the middle of a running application.

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Environment

• React Native Navigation version: 2.1.3, 2.1.3-snapshot.49
• React Native version: 0.57.7
• Platform(s) (iOS, Android, or both?): Android, yes; iOS, unknown
• Device info (Simulator/Device? OS version? Debug/Release?): Multiple devices, multiple emulators with different images

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