Support onGestureEnter/Exit/Share/Update events #35556
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This is like the onEnter/Exit/Share/Update events but for gestures. It allows manually controlling the animation using the passed timeline.
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This was referenced Jan 19, 2026
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| } | ||
| for (let i = 0; i < pendingEvents.length; i++) { | ||
| const viewTransitionEvent = pendingEvents[i]; | ||
| viewTransitionEvent(pendingTypes); |
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This calls user code. Does it need to be wrapped in error handling? Didn't see where else that might be happening.
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I think these are similar to onRecoverableError. I don't think they're handled properly in the existing one in flushSpawnedWork is right neither.
The way these phases flush is that they keep mutable state so that they can pick up and flush remaining phases if one is missed. So if this errors, then it errors the view transition which then flushes the remaining work which flushes the previous work but it doesn't flush this again so it probably misses anything after this. That means that bugs in React code might not be properly handled.
However, to ensure that other callbacks are handled, these should probably be wrapped in try/catch for each callback so that they're independently handled. Same thing for onRecoverableError.
There's also a question of what the default priority and execution context should be for these.
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Follow up to #35337. During a gesture, we always cancel the original animation and create a new one that we control. That's the one we need to add to the set that needs to be cancelled. Otherwise future gestures hang. An unfortunate consequence is that any custom ones that you start e.g. with #35556 or through other means aren't automatically cleaned up (in fact there's not even a clean up callback yet). This can lead these to freeze the whole UI afterwards. It would be really good to get this fixed in browsers instead so we can revert #35337.
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…ts (#35564) Stacked on #35556 and #35559. Given that we don't automatically clean up all view transition animations since #35337 and browsers are buggy, it's important that you clean up any `Animation` started manually from the events. However, there was no clean up function for when the View Transition is forced to stop. This also makes it harder to clean up custom timers etc too. This lets you return a clean up function from all the events on `<ViewTransition>`.
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…ts (#35564) Stacked on #35556 and #35559. Given that we don't automatically clean up all view transition animations since #35337 and browsers are buggy, it's important that you clean up any `Animation` started manually from the events. However, there was no clean up function for when the View Transition is forced to stop. This also makes it harder to clean up custom timers etc too. This lets you return a clean up function from all the events on `<ViewTransition>`. DiffTrain build for [c55ffb5](c55ffb5)
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cc @eps1lon for DefinitelyTyped |
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[diff facebook/react@41b3e9a6...d2908752](facebook/react@41b3e9a...d290875) <details> <summary>React upstream changes</summary> - facebook/react#35567 - facebook/react#35566 - facebook/react#35565 - facebook/react#35564 - facebook/react#35559 - facebook/react#35556 </details>
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This is like the onEnter/Exit/Share/Update events but for gestures. It allows manually controlling the animation using the passed timeline.