WeakRef support

[phryneas]

Introduction

Hermes has support for WeakRefs, but it seems it's not enabled for React Native.

Details

From facebook/hermes#658 and facebook/hermes#1195, it seems that this requires action on the React Native side (enabling the microtask-queue flag for Hermes and then routinely calling drainMicrotasks).

Discussion points

Is there a reason why microtask-queue is not enabled, and could it be enabled?

[cortinico]

Thanks for flagging this. Let's keep the conversation on:

• WeakRef support facebook/hermes#1195

The Hermes team is aware of this + we'll have to do some integration work on the React Native side. This is currently under our radar but we don't have an ETA

[Yonom]

@cortinico The linked issue has been closed:

Closing, because there is nothing more to be done about this in Hermes.

I couldn't find any open issues regarding RN support of WeakRefs.
Perhaps it makes sense to reopen this one to track react native support?

[pilotniq]

@cortinico Yes, please re-open this issue, so that we can follow the progress!

[CptKicks]

+1 - Please re-open the issue

[cortinico]

I've opened this one to keep the conversation going:

• Hermes WeakRef Support in React Native react/react-native#42742