Unwrap sync resolved thenables without suspending #25615
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If a thenable resolves synchronously, `use` should unwrap its result without suspending or interrupting the component's execution.
Synchronously resolved thenables are now unwrapped directly inside `use`. So we don't need this extra logic in the work loop anymore.
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GrinZero
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Nov 7, 2022
* 'main' of ssh://github.com/GrinZero/react: (163 commits) Do not unmount layout effects if ancestor Offscreen is hidden (facebook#25628) Remove check in renderDidSuspendDelayIfPossible (facebook#25630) [ServerRenderer] Move fizz external runtime implementation to react-dom-bindings (facebook#25617) Unwrap sync resolved thenables without suspending (facebook#25615) refactor isHostResourceType to not receive the context from reconciler and not leak types (facebook#25610) Make host context use null as empty and only error in dev (facebook#25609) [Float] handle resource Resource creation inside svg context (facebook#25599) Allow uncached IO to stablize (facebook#25561) [ServerRenderer] Setup for adding data attributes streaming format (facebook#25567) Do not unmount layout effects on initial Offscreen mount (facebook#25592) Fix type check for null (facebook#25595) Clean up vestige of useOpaqueIdentifier (facebook#25587) Extract logic for detecting bad fallback to helper Split suspended work loop logic into separate functions In work loop, add enum of reasons for suspending Strict Mode: Reuse memoized result from first pass (facebook#25583) Detect and warn if use(promise) is wrapped with try/catch block (facebook#25543) Remove old react-fetch, react-fs and react-pg libraries (facebook#25577) Try assigning fetch to globalThis if global assignment fails (facebook#25571) [Float] handle noscript context for Resources (facebook#25559) ... # Conflicts: # scripts/rollup/build.js
facebook-github-bot
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Summary: This sync includes the following changes: - **[4bd245e9e](facebook/react@4bd245e9e )**: Do not unmount layout effects if ancestor Offscreen is hidden ([#25628](facebook/react#25628)) //<Samuel Susla>// - **[df61e708c](facebook/react@df61e708c )**: Remove check in renderDidSuspendDelayIfPossible ([#25630](facebook/react#25630)) //<Andrew Clark>// - **[1a08f1478](facebook/react@1a08f1478 )**: [ServerRenderer] Move fizz external runtime implementation to react-dom-bindings ([#25617](facebook/react#25617)) //<mofeiZ>// - **[1a902623a](facebook/react@1a902623a )**: Unwrap sync resolved thenables without suspending ([#25615](facebook/react#25615)) //<Andrew Clark>// - **[4ea063b56](facebook/react@4ea063b56 )**: refactor isHostResourceType to not receive the context from reconciler and not leak types ([#25610](facebook/react#25610)) //<Josh Story>// - **[8e69bc45a](facebook/react@8e69bc45a )**: Make host context use null as empty and only error in dev ([#25609](facebook/react#25609)) //<Sebastian Markbåge>// - **[5f7ef8c4c](facebook/react@5f7ef8c4c )**: [Float] handle resource Resource creation inside svg context ([#25599](facebook/react#25599)) //<Josh Story>// - **[36426e6cb](facebook/react@36426e6cb )**: Allow uncached IO to stablize ([#25561](facebook/react#25561)) //<Andrew Clark>// - **[6883d7944](facebook/react@6883d7944 )**: [ServerRenderer] Setup for adding data attributes streaming format ([#25567](facebook/react#25567)) //<mofeiZ>// Changelog: [General][Changed] - React Native sync for revisions ab075a2...4bd245e jest_e2e[run_all_tests] Reviewed By: GijsWeterings Differential Revision: D41028209 fbshipit-source-id: a67fdcd441ddd50784f7c1ce402eaecdb5e3126d
XiNiHa
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Nov 8, 2022
| rejectedThenable.status = 'rejected'; | ||
| rejectedThenable.reason = error; | ||
| } | ||
| }, | ||
| ); | ||
|
|
||
| // Check one more time in case the thenable resolved synchronously | ||
| switch (thenable.status) { |
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@acdlite this never gets hit, since this always results in 'pending':
const syncThen = (p) => {
let status = 'pending'
p.then(() => status = 'fulfilled')
console.log(status)
}
syncThen(Promise.resolve()) // 'pending'
syncThen(new Promise(r => r())) // 'pending'
const resolved = new Promise(r => r())
syncThen(resolved) // 'pending'
setTimeout(() => syncThen(resolved), 0) // 'pending'I believe it's because .then always gets executed asynchronously, like setTimeout(..., 0)
(I found this while testing with use(Promise.resolve()) in the experimental version)
rickhanlonii
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Dec 3, 2022
If a thenable resolves synchronously, `use` should unwrap its result without suspending or interrupting the component's execution.
OlimpiaZurek
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May 22, 2023
Summary: This sync includes the following changes: - **[4bd245e9e](facebook/react@4bd245e9e )**: Do not unmount layout effects if ancestor Offscreen is hidden ([facebook#25628](facebook/react#25628)) //<Samuel Susla>// - **[df61e708c](facebook/react@df61e708c )**: Remove check in renderDidSuspendDelayIfPossible ([facebook#25630](facebook/react#25630)) //<Andrew Clark>// - **[1a08f1478](facebook/react@1a08f1478 )**: [ServerRenderer] Move fizz external runtime implementation to react-dom-bindings ([facebook#25617](facebook/react#25617)) //<mofeiZ>// - **[1a902623a](facebook/react@1a902623a )**: Unwrap sync resolved thenables without suspending ([facebook#25615](facebook/react#25615)) //<Andrew Clark>// - **[4ea063b56](facebook/react@4ea063b56 )**: refactor isHostResourceType to not receive the context from reconciler and not leak types ([facebook#25610](facebook/react#25610)) //<Josh Story>// - **[8e69bc45a](facebook/react@8e69bc45a )**: Make host context use null as empty and only error in dev ([facebook#25609](facebook/react#25609)) //<Sebastian Markbåge>// - **[5f7ef8c4c](facebook/react@5f7ef8c4c )**: [Float] handle resource Resource creation inside svg context ([facebook#25599](facebook/react#25599)) //<Josh Story>// - **[36426e6cb](facebook/react@36426e6cb )**: Allow uncached IO to stablize ([facebook#25561](facebook/react#25561)) //<Andrew Clark>// - **[6883d7944](facebook/react@6883d7944 )**: [ServerRenderer] Setup for adding data attributes streaming format ([facebook#25567](facebook/react#25567)) //<mofeiZ>// Changelog: [General][Changed] - React Native sync for revisions ab075a2...4bd245e jest_e2e[run_all_tests] Reviewed By: GijsWeterings Differential Revision: D41028209 fbshipit-source-id: a67fdcd441ddd50784f7c1ce402eaecdb5e3126d
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If a thenable resolves synchronously,
useshould unwrap its result without suspending or interrupting the component's execution.