[v9] remove react-test-renderer

[krispya]

react-test-renderer is deprecated and should be removed.

[joshuaellis]

This is used for react-native testing – is there a better way now? I've been out of the loop with react-native for some time.

[krispya]

React officially recommends the React Testing Library. I don't know much about it myself but it is something we need to address since it won't be supported going forward.

[joshuaellis]

Okay, we need to look at alts for RN before removing imo

[CodyJasonBennett]

We will remove react-test-renderer or we cannot upgrade. Reconcilers are published in lockstep with React and are generally not forward or backwards compatible, especially React 19. Our options are looking for alternatives or building our own. I would simply suggest our react-nil if not for the primary/secondary renderer problem (only two concurrent renderers are supported, and they can't mismatch roles).

[joshuaellis]

I don't think anyone is suggesting not removing it, we're just discussing what way is best to do it going forward for native 😊

[joshuaellis]

lil' update – React Testing Library is for DOM, there is a react-native equivalent, but that uses react-test-renderer under the hood. We'll need to monitor the RN space and see what happens there because i'm not sure at the moment.

[krispya]

I asked Callstack and this is what they use: https://github.com/callstack/react-native-testing-library

Relevant: callstack/react-native-testing-library#1669