FYI react native developers - Hermes memory leak

[edkimmel]

facebook/hermes@e7b2abe

It appears that jotai is susceptible to the above WeakMap memory leak in ReactNative's Hermes engine.

We extensively use jotai in our application. Pushing different parts of its scaling to the limit. Two very large atom trees were joined together recently, and we began to notice memory pressure and slower GCs coming from jotai when some base atoms were modified a few times in a session.

Calling globalThis.gc() explicitly does free up the leaked memory. It would be better to update to a patched Hermes version of course, but at least there's a solution without needing an upgrade.