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react/packages/react-devtools-shared
Ruslan Lesiutin 997f52fbb3 fix[devtools/updateFiberRecursively]: mount suspense fallback set in timed out case (#27147)
Fixes https://github.com/facebook/react/issues/26793.

I have received a constantly reproducible example of the error, that is
mentioned in the issue above.
When starting `Reload and Profile` in DevTools, React reports an unmount
of a functional component inside Suspense's fallback via
[`onCommitFiberUnmount`](3ff846d106/packages/react-devtools-shared/src/hook.js (L408-L413))
in
[`commitDeletionEffectsOnFiber`](https://github.com/facebook/react/blob/main/packages/react-reconciler/src/ReactFiberCommitWork.js#L2025),
but this fiber was never registered as mounted in DevTools.

While debugging, I've noticed that in timed-out case for Suspense trees
we only check if both previous fallback child set and next fiber
fallback child set are non-null, but in these recursive calls there is
also a case when previous fallback child set is null and next set is
non-null, so we were skipping the branch.

<img width="1746" alt="Screenshot 2023-07-25 at 15 26 07"
src="https://github.com/facebook/react/assets/28902667/da21a682-9973-43ec-9653-254ba98a0a3f">

After these changes, the issue is no longer reproducible, but I am not
sure if this is the right solution, since I don't know if this case is
correct from reconciler perspective.
2023-08-03 20:02:18 +01:00
..
2022-03-16 11:37:10 -04:00

This directory contains code shared between several DevTools packages:

  • /packages/react-devtools-core
  • /packages/react-devtools-extensions
  • /packages/react-devtools-inline

It is not published or released anywhere directly.