Fix: Synchronous popstate transitions #30759
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eps1lon
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Aug 22, 2024
This is a refactor of the fix in facebook#27505. When a transition update is scheduled by a popstate event, (i.e. a back/ forward navigation) we attempt to render it synchronously even though it's a transition, since it's likely the previous page's data is cached. In facebook#27505, I changed the implementation so that it only "upgrades" the priority of the transition for a single attempt. If the attempt suspends, say because the data is not cached after all, from then on it should be treated as a normal transition. But it turns out facebook#27505 did not work as intended, because it relied on marking the root with pending synchronous work (root.pendingLanes), which was never cleared until the popstate update completed. The test scenarios I wrote accidentally worked for a different reason related to suspending the work loop, which I'm currently in the middle of refactoring.
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eps1lon
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| function getLanesOfEqualOrHigherPriority(lanes: Lane | Lanes): Lanes { | ||
| // Create a mask with all bits to the right or same as the highest bit. | ||
| // So if lanes is 0b100, the result would be 0b111. | ||
| // If lanes is 0b101, the result would be 0b111. | ||
| const lowestPriorityLaneIndex = 31 - clz32(lanes); | ||
| return (1 << (lowestPriorityLaneIndex + 1)) - 1; | ||
| } |
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That makes sense to me now 👍🏻
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This is a refactor of the fix in #27505. When a transition update is scheduled by a popstate event, (i.e. a back/ forward navigation) we attempt to render it synchronously even though it's a transition, since it's likely the previous page's data is cached. In #27505, I changed the implementation so that it only "upgrades" the priority of the transition for a single attempt. If the attempt suspends, say because the data is not cached after all, from then on it should be treated as a normal transition. But it turns out #27505 did not work as intended, because it relied on marking the root with pending synchronous work (root.pendingLanes), which was never cleared until the popstate update completed. The test scenarios I wrote accidentally worked for a different reason related to suspending the work loop, which I'm currently in the middle of refactoring. DiffTrain build for commit ee7f675.
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This is a refactor of the fix in #27505. When a transition update is scheduled by a popstate event, (i.e. a back/ forward navigation) we attempt to render it synchronously even though it's a transition, since it's likely the previous page's data is cached. In #27505, I changed the implementation so that it only "upgrades" the priority of the transition for a single attempt. If the attempt suspends, say because the data is not cached after all, from then on it should be treated as a normal transition. But it turns out #27505 did not work as intended, because it relied on marking the root with pending synchronous work (root.pendingLanes), which was never cleared until the popstate update completed. The test scenarios I wrote accidentally worked for a different reason related to suspending the work loop, which I'm currently in the middle of refactoring. DiffTrain build for [ee7f675](ee7f675)
This was referenced Aug 27, 2024
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### Based on - #30761 - #30759 --- `use` has an optimization where in some cases it can suspend the work loop during the render phase until the data has resolved, rather than unwind the stack and lose context. However, the current implementation is not compatible with sibling prerendering. So I've temporarily disabled it until the sibling prerendering has been refactored. We will add it back in a later step.
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### Based on - #30761 - #30759 --- `use` has an optimization where in some cases it can suspend the work loop during the render phase until the data has resolved, rather than unwind the stack and lose context. However, the current implementation is not compatible with sibling prerendering. So I've temporarily disabled it until the sibling prerendering has been refactored. We will add it back in a later step. DiffTrain build for [8b4c54c](8b4c54c)
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### Based on - #30761 - #30759 --- `use` has an optimization where in some cases it can suspend the work loop during the render phase until the data has resolved, rather than unwind the stack and lose context. However, the current implementation is not compatible with sibling prerendering. So I've temporarily disabled it until the sibling prerendering has been refactored. We will add it back in a later step. DiffTrain build for commit 8b4c54c.
mofeiZ
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Oct 11, 2024
### Based on - #30761 - #30759 --- `use` has an optimization where in some cases it can suspend the work loop during the render phase until the data has resolved, rather than unwind the stack and lose context. However, the current implementation is not compatible with sibling prerendering. So I've temporarily disabled it until the sibling prerendering has been refactored. We will add it back in a later step. [ghstack-poisoned]
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This is a refactor of the fix in #27505.
When a transition update is scheduled by a popstate event, (i.e. a back/ forward navigation) we attempt to render it synchronously even though it's a transition, since it's likely the previous page's data is cached.
In #27505, I changed the implementation so that it only "upgrades" the priority of the transition for a single attempt. If the attempt suspends, say because the data is not cached after all, from then on it should be treated as a normal transition.
But it turns out #27505 did not work as intended, because it relied on marking the root with pending synchronous work (root.pendingLanes), which was never cleared until the popstate update completed.
The test scenarios I wrote accidentally worked for a different reason related to suspending the work loop, which I'm currently in the middle of refactoring.