enableAppHangTracking for JavaScript

[p-himik]

Problem Statement

Since JS in browsers is single-threaded, it's not that hard to make it get stuck in a busy loop without Sentry reporting it.

The React Native version of Sentry has an integration for app hang detection: https://docs.sentry.io/platforms/react-native/configuration/app-hangs/

Perhaps something similar can be added for the JS version?

Solution Brainstorm

AFAICT, Sentry already uses workers, so maybe such a feature can be implemented by periodically pinging a worker and triggering an error if the worker doesn't receive pings for some configurable amount of time.

[AbhiPrasad]

Hey @p-himik, thanks for writing in!

enableAppHangTracking in React Native actually uses the native sdk under the hood to track this (so done on native layer instead of js layer). This is why it's only available in iOS and not android too.

The challenge here is we need to make sure a similar approach does not lead too much backpressure on the event loop (essentially the tracking causing issues on the main thread).

I do think this is doable though, but backlogging this as we have other priorities. PRs are welcome if anyone would like to help build this for us!