Current behavior for use resulting in stuck isPending
#29209
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eps1lon
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May 22, 2024
| 'Value: initial, Pending: true', | ||
| 'Value: updated, Pending: true', | ||
| ]); | ||
| expect(root).toMatchRenderedOutput('Value: updated, Pending: true'); |
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We commit the value from the updated, resolved promise but don't flip isPending.
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eps1lon
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May 22, 2024
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| const [isPending, startLocalTransition] = useTransition(); | ||
| click = () => { | ||
| startLocalTransition(() => { | ||
| setPromise( |
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Suggested change
| const [isPending, startLocalTransition] = useTransition(); | |
| click = () => { | |
| startLocalTransition(() => { | |
| setPromise( | |
| const [isPending, setIsPending] = useOptimistic(false); | |
| click = () => { | |
| startTransition(() => { | |
| setIsPending(true); | |
| setPromise( |
does work.
acdlite
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May 31, 2024
When a component suspends with `use`, we switch to the "re-render" dispatcher during the subsequent render attempt, so that we can reuse the work from the initial attempt. However, once we run out of hooks from the previous attempt, we should switch back to the regular "update" dispatcher. This is conceptually the same fix as the one introduced in #26232. That fix only accounted for initial mount, but the useTransition regression test added in f829733 illustrates that we need to handle updates, too. The issue affects more than just useTransition but because most of the behavior between the "re-render" and "update" dispatchers is the same it's hard to contrive other scenarios in a test, which is probably why it took so long for someone to notice. Closes #28923 and #29209 --------- Co-authored-by: eps1lon <sebastian.silbermann@vercel.com>
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When a component suspends with `use`, we switch to the "re-render" dispatcher during the subsequent render attempt, so that we can reuse the work from the initial attempt. However, once we run out of hooks from the previous attempt, we should switch back to the regular "update" dispatcher. This is conceptually the same fix as the one introduced in #26232. That fix only accounted for initial mount, but the useTransition regression test added in f829733 illustrates that we need to handle updates, too. The issue affects more than just useTransition but because most of the behavior between the "re-render" and "update" dispatchers is the same it's hard to contrive other scenarios in a test, which is probably why it took so long for someone to notice. Closes #28923 and #29209 --------- Co-authored-by: eps1lon <sebastian.silbermann@vercel.com> DiffTrain build for [adbec0c](adbec0c)
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When a component suspends with `use`, we switch to the "re-render" dispatcher during the subsequent render attempt, so that we can reuse the work from the initial attempt. However, once we run out of hooks from the previous attempt, we should switch back to the regular "update" dispatcher. This is conceptually the same fix as the one introduced in #26232. That fix only accounted for initial mount, but the useTransition regression test added in f829733 illustrates that we need to handle updates, too. The issue affects more than just useTransition but because most of the behavior between the "re-render" and "update" dispatchers is the same it's hard to contrive other scenarios in a test, which is probably why it took so long for someone to notice. Closes #28923 and #29209 --------- Co-authored-by: eps1lon <sebastian.silbermann@vercel.com> DiffTrain build for commit adbec0c.
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Fixed in #29670 |
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Summary
Test reproducing #28923
How did you test this change?
yarn test --watch packages/react-reconciler/src/__tests__/ReactUse-test.js -t "does not get stuck in pending state with usable values in state"