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Stacked on #34892.

In the timeline scrubber each timeline entry gets a label and color assigned based on the environment computed for that step.

In the rects, we find the timeline step that this boundary is part of and use that environment to assign a color. This is slightly different than picking from the boundary itself since it takes into account parent boundaries.

In the "suspended by" section we color each entry individually based on the environment that spawned the I/O.

Screenshot 2025-10-17 at 12 18 56 AM

@sebmarkbage sebmarkbage requested a review from eps1lon October 17, 2025 04:22
@meta-cla meta-cla bot added the CLA Signed label Oct 17, 2025
@github-actions github-actions bot added the React Core Team Opened by a member of the React Core Team label Oct 17, 2025
@sebmarkbage sebmarkbage merged commit 3a66917 into facebook:main Oct 17, 2025
239 of 240 checks passed
hoxyq added a commit that referenced this pull request Oct 20, 2025
Full list of changes:

* Text layout fixes for stack traces with badges
([eps1lon](https://github.com/eps1lon) in
[#34925](#34925))
* chore: read from build/COMMIT_SHA fle as fallback for commit hash
([hoxyq](https://github.com/hoxyq) in
[#34915](#34915))
* fix: dont ship source maps for css in prod builds
([hoxyq](https://github.com/hoxyq) in
[#34913](#34913))
* Lower case "rsc stream" debug info
([sebmarkbage](https://github.com/sebmarkbage) in
[#34921](#34921))
* BuiltInCallSite should have padding-left
([sebmarkbage](https://github.com/sebmarkbage) in
[#34922](#34922))
* Show the Suspense boundary name in the rect if there's no overlap
([sebmarkbage](https://github.com/sebmarkbage) in
[#34918](#34918))
* Don't attach filtered IO to grandparent Suspense
([eps1lon](https://github.com/eps1lon) in
[#34916](#34916))
* Infer name from stack if it's the generic "lazy" name
([sebmarkbage](https://github.com/sebmarkbage) in
[#34907](#34907))
* Use same Suspense naming heuristics when reconnecting
([eps1lon](https://github.com/eps1lon) in
[#34898](#34898))
* Assign a different color and label based on environment
([sebmarkbage](https://github.com/sebmarkbage) in
[#34893](#34893))
* Compute environment names for the timeline
([sebmarkbage](https://github.com/sebmarkbage) in
[#34892](#34892))
* Don't highlight the root rect if no roots has unique suspenders
([sebmarkbage](https://github.com/sebmarkbage) in
[#34885](#34885))
* Highlight the rect when the corresponding timeline bean is hovered
([sebmarkbage](https://github.com/sebmarkbage) in
[#34881](#34881))
* Repeat the "name" if there's no short description in groups
([sebmarkbage](https://github.com/sebmarkbage) in
[#34894](#34894))
* Tweak the rects design and create multi-environment color scheme
([sebmarkbage](https://github.com/sebmarkbage) in
[#34880](#34880))
* Adjust the rects size by one pixel smaller
([sebmarkbage](https://github.com/sebmarkbage) in
[#34876](#34876))
* Remove steps title from scrubber
([sebmarkbage](https://github.com/sebmarkbage) in
[#34878](#34878))
* Include some sub-pixel precision in rects
([sebmarkbage](https://github.com/sebmarkbage) in
[#34873](#34873))
* Don't pluralize if already plural
([sebmarkbage](https://github.com/sebmarkbage) in
[#34870](#34870))
* Don't try to load anonymous or empty urls
([sebmarkbage](https://github.com/sebmarkbage) in
[#34869](#34869))
* Add inspection button to Suspense tab
([sebmarkbage](https://github.com/sebmarkbage) in
[#34867](#34867))
* Don't select on hover ([sebmarkbage](https://github.com/sebmarkbage)
in [#34860](#34860))
* Don't highlight on timeline
([sebmarkbage](https://github.com/sebmarkbage) in
[#34861](#34861))
* The bridge event types should only be defined in one direction
([sebmarkbage](https://github.com/sebmarkbage) in
[#34859](#34859))
* Attempt at a better "unique suspender" text
([sebmarkbage](https://github.com/sebmarkbage) in
[#34854](#34854))
* Track whether a boundary is currently suspended and make transparent
([sebmarkbage](https://github.com/sebmarkbage) in
[#34853](#34853))
* Don't hide overflow rectangles
([sebmarkbage](https://github.com/sebmarkbage) in
[#34852](#34852))
* Measure text nodes ([sebmarkbage](https://github.com/sebmarkbage) in
[#34851](#34851))
* Don't measure fallbacks when suspended
([sebmarkbage](https://github.com/sebmarkbage) in
[#34850](#34850))
* Filter out built-in stack frames
([sebmarkbage](https://github.com/sebmarkbage) in
[#34828](#34828))
* Exclude Suspense boundaries in hidden Activity
([eps1lon](https://github.com/eps1lon) in
[#34756](#34756))
* Group consecutive suspended by rows by the same name
([sebmarkbage](https://github.com/sebmarkbage) in
[#34830](#34830))
* Preserve the original index when sorting suspended by
([sebmarkbage](https://github.com/sebmarkbage) in
[#34829](#34829))
* Don't show the root as being non-compliant
([sebmarkbage](https://github.com/sebmarkbage) in
[#34827](#34827))
* Ignore suspense boundaries, without visual representation, in the
timeline ([sebmarkbage](https://github.com/sebmarkbage) in
[#34824](#34824))
* Explicitly say which id to scroll to and only once
([sebmarkbage](https://github.com/sebmarkbage) in
[#34823](#34823))
* devtools: fix ellipsis truncation for key values
([sophiebits](https://github.com/sophiebits) in
[#34796](#34796))
* fix(devtools): remove duplicated "Display density" field in General
settings ([Anatole-Godard](https://github.com/Anatole-Godard) in
[#34792](#34792))
* Gate SuspenseTab ([hoxyq](https://github.com/hoxyq) in
[#34754](#34754))
* Release `<ViewTransition />` to Canary
([eps1lon](https://github.com/eps1lon) in
[#34712](#34712))
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