I'm currently using redux-observable for effects. It fits nice into whole redux flow (the question is if I need Redux itself, but that's a separate matter)
Sometimes I use RxJS directly in an effect hook (surely, with teardown!), but there are RxJS hook libraries for that, e.g.: re-rxjs/react-rxjs, crimx/observable-hooks and LeetCode-OpenSource/rxjs-hooks (they have thousands of weekly downloads! Alas, I haven't tried them well yet)
And I made a tiny React + RxJS package to display Observable content:
P.S. I also created an ⚠️ experimental JSX + RxJS framework — it's cute, check it out!
And what RxJS + React addons do you use?
How do you like them? Share an example!
Do you think we even need RxJS in React?