[DevTools] Remove use of .alternate in root and recordProfilingDurations #30895
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sebmarkbage
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Sep 6, 2024
| @@ -3447,6 +3446,8 @@ export function attach( | |||
| const stashedPrevious = previouslyReconciledSibling; | |||
| const stashedRemaining = remainingReconcilingChildren; | |||
| if (fiberInstance !== null) { | |||
| // Update the Fiber so we that we always keep the current Fiber on the data. | |||
| fiberInstance.data = nextFiber; | |||
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This revealed this bug. I wasn't updating the fiber in all places that I called updateFiberRecursively(). It should really be in here for parity with the create path.
hoxyq
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Sep 6, 2024
This was referenced Sep 9, 2024
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Sep 12, 2024
**breaking change for canary users: Bumps peer dependency of React from `19.0.0-rc-7771d3a7-20240827` to `19.0.0-rc-94e652d5-20240912`** [diff facebook/react@7771d3a7...94e652d5](facebook/react@7771d3a...94e652d) <details> <summary>React upstream changes</summary> - facebook/react#30952 - facebook/react#30950 - facebook/react#30946 - facebook/react#30934 - facebook/react#30947 - facebook/react#30945 - facebook/react#30938 - facebook/react#30936 - facebook/react#30879 - facebook/react#30888 - facebook/react#30931 - facebook/react#30930 - facebook/react#30832 - facebook/react#30929 - facebook/react#30926 - facebook/react#30925 - facebook/react#30905 - facebook/react#30900 - facebook/react#30910 - facebook/react#30906 - facebook/react#30899 - facebook/react#30919 - facebook/react#30708 - facebook/react#30907 - facebook/react#30897 - facebook/react#30896 - facebook/react#30895 - facebook/react#30887 - facebook/react#30889 - facebook/react#30893 - facebook/react#30892 - facebook/react#30891 - facebook/react#30882 - facebook/react#30881 - facebook/react#30870 - facebook/react#30849 - facebook/react#30878 - facebook/react#30865 - facebook/react#30869 - facebook/react#30875 - facebook/react#30800 - facebook/react#30762 - facebook/react#30831 - facebook/react#30866 - facebook/react#30853 - facebook/react#30850 - facebook/react#30847 - facebook/react#30842 - facebook/react#30837 - facebook/react#30848 - facebook/react#30844 - facebook/react#30839 - facebook/react#30802 - facebook/react#30841 - facebook/react#30827 - facebook/react#30826 - facebook/react#30825 - facebook/react#30824 - facebook/react#30840 - facebook/react#30838 - facebook/react#30836 - facebook/react#30819 - facebook/react#30816 - facebook/react#30814 - facebook/react#30813 - facebook/react#30812 - facebook/react#30811 </details> --------- Co-authored-by: vercel-release-bot <infra+release@vercel.com>
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Ideally we shouldn't use the
.alternateto access previous state because ideally Fibers shouldn't have alternates.The only case it's ok to use it is when it is used to identity the stateful part of a component's identity. In a non-alternate Fiber model there would instead be another object that represents instance but in the current model it's modeled by the pair.
It's not ok is to get the previous state of the tree since that would not live on the stateful part.
We don't generally need this though because we have the previous state on instance.data before updating it, or passed from above.