[flags] add enableEffectEventMutationPhase #35548
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rickhanlonii
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Jan 17, 2026
| ...(gate('enableViewTransition') && | ||
| !gate('enableEffectEventMutationPhase') | ||
| ? ['Child Layout Create A 3 2 B 1 1 1'] | ||
| : ['Child Layout Create A 3 2 B 3 2 2']), |
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@sebmarkbage can you review these tests and let me know if you think the first or second logs are right? Inside enableViewTransition, when a tree goes from hidden to visible we were not updating the useEffectEvent callback ref.
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Small optimization for useEffectEvent. Not sure we even need a flag for it, but it will be a nice killswitch.
As an added benefit, it fixes a bug when
enableViewTransitionis on, where we were not updating the useEffectEvent callback when a tree went from hidden to visible.