Files
react/packages/react-noop-renderer
Sebastian Markbåge c13986da78 Fix Overlapping "message" Bug in Performance Track (#31528)
When you schedule a microtask from render or effect and then call
setState (or ping) from there, the "event" is the event that React
scheduled (which will be a postMessage). The event time of this new
render will be before the last render finished.

We usually clamp these but in this scenario the update doesn't happen
while a render is happening. Causing overlapping events.

Before:

<img width="1229" alt="Screenshot 2024-11-12 at 11 01 30 PM"
src="https://github.com/user-attachments/assets/9652cf3b-b358-453c-b295-1239cbb15952">

Therefore when we finalize a render we need to store the end of the last
render so when we a new update comes in later with an event time earlier
than that, we know to clamp it.

There's also a special case here where when we enter the
`RootDidNotComplete` or `RootSuspendedWithDelay` case we neither leave
the root as in progress nor commit it. Those needs to finalize too.
Really this should be modeled as a suspended track that we haven't added
yet. That's the gap between "Blocked" and "message" below.

After:

<img width="1471" alt="Screenshot 2024-11-13 at 12 31 34 AM"
src="https://github.com/user-attachments/assets/b24f994e-9055-4b10-ad29-ad9b36302ffc">

I also fixed an issue where we may log the same event name multiple
times if we're rendering more than once in the same event. In this case
I just leave a blank trace between the last commit and the next update.

I also adding ignoring of the "message" event at all in these cases when
the event is from React's scheduling itself.
2024-11-14 16:35:08 -05:00
..
2016-10-25 08:36:37 +01:00

react-noop-renderer

This package is the renderer we use for debugging Fiber. It is not intended to be used directly.