Is it ok to create nested effect?

[zhaoyao91]

Is it ok to create nested effect?
If it is, what is the expected behavior?

[ryansolid]

Yes. And only the nearest parent effect tracks. So if the internal one re-evals it does so as you'd expect. If the external one does it disposes of the internal one, and through re-running recreates it.

[zhaoyao91]

I found if I use onCleanup in effect, the cleanup callback will get rerun before each time the effect rerun. Is this by design?

[ryansolid]

Yes because presumably what it created previously will be created again. Similar to React's useEffect return function. It runs on final cleanup and before each execution.