Suspensily committing a prerendered tree #26434
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| "473": "React doesn't accept base64 encoded file uploads because we don't except form data passed from a browser to ever encode data that way. If that's the wrong assumption, we can easily fix it.", |
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| "473": "React doesn't accept base64 encoded file uploads because we don't except form data passed from a browser to ever encode data that way. If that's the wrong assumption, we can easily fix it.", | |
| "473": "React doesn't accept base64 encoded file uploads because we don't expect form data passed from a browser to ever encode data that way. If that's the wrong assumption, we can easily fix it.", |
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Nice catch. Could you open this as a separate PR, please?
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thanks. sure, pushing the patch...
PS: can you or someone from team review this huge typo (~140 typos) fix pr #26424 ?
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| } catch (error) { | ||
| captureCommitPhaseError(child, child.return, error); | ||
| } |
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| root.render(<Details showMore={false} />); | ||
| // First render the outer component, without the hidden content | ||
| await waitForPaint(['Details']); | ||
| expect(root).toMatchRenderedOutput(<div>Main Content</div>); |
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shouldn't this be in startTransition too to demonstrate that its not just committing b/c of a sync render?
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The important part here is that the offscreen content is not being rendered, or even attempted. It's deferred until a later paint.
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but I suppose I could add another test to verify that it doesn't accidentally start becoming suspensey if the original update that spawned it was a transition.
Follow up to facebook#26450. In `acquireResource`, if a stylesheet resource already has an instance, we need to confirm that it was inserted into the document, because it may have been suspended. This happens because stylesheet resources are assigned a resource before committing, inside `suspendResource`. Probably a factoring a smell. As currently implemented, the idea is that `suspendResource` does all the same stuff as `acquireResource` except for the insertion.
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Follow up to facebook#26450. In the complete phase of HostHoistable, it should call suspendResource instead of suspenseInstance. I refactored the code a bit to make the branching more clear. There's a test case that covers this but it's currently gated behind a TODO because of another issue, which I'll fix in the next step.
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Prerendering a tree (i.e. with Offscreen) should not suspend the commit phase, because the content is not yet visible. However, when revealing a prerendered tree, we should suspend the commit phase if resources in the prerendered tree haven't finished loading yet. To do this properly, we need to visit all the visible nodes in the tree that might possibly suspend. This includes nodes in the current tree, because even though they were already "mounted", the resources might not have loaded yet, because we didn't suspend when it was prerendered. We will need to add this capability to the Offscreen component's "manual" mode, too. Something like a `ready()` method that returns a promise that resolves when the tree has fully loaded.
In facebook#26450, @gnoff wrote a test for a suspensey stylesheet update that gets interrupted. It was broken because of behavior that wasn't implemented yet, but has now been fixed by my previous commits. I re-enabled the test and added some comments. There was one assertion that was slightly wrong and I fixed that too.
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Prerendering a tree (i.e. with Offscreen) should not suspend the commit phase, because the content is not yet visible. However, when revealing a prerendered tree, we should suspend the commit phase if resources in the prerendered tree haven't finished loading yet. To do this properly, we need to visit all the visible nodes in the tree that might possibly suspend. This includes nodes in the current tree, because even though they were already "mounted", the resources might not have loaded yet, because we didn't suspend when it was prerendered. We will need to add this capability to the Offscreen component's "manual" mode, too. Something like a `ready()` method that returns a promise that resolves when the tree has fully loaded. Also includes some fixes to #26450. See PR for details. DiffTrain build for [768f965](768f965)
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Summary: This sync includes the following changes: - **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([#26489](facebook/react#26489)) //<Ricky>// - **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([#26524](facebook/react#26524)) //<Sebastian Markbåge>// - **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([#26474](facebook/react#26474)) //<dan>// - **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([#26523](facebook/react#26523)) //<Sebastian Markbåge>// - **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([#26513](facebook/react#26513)) //<Sebastian Markbåge>// - **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([#26511](facebook/react#26511)) //<Andrew Clark>// - **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([#26510](facebook/react#26510)) //<Joseph Savona>// - **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([#26514](facebook/react#26514)) //<Sebastian Markbåge>// - **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([#26507](facebook/react#26507)) //<Sebastian Markbåge>// - **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([#26509](facebook/react#26509)) //<Andrew Clark>// - **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([#26508](facebook/react#26508)) //<Andrew Clark>// - **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([#26478](facebook/react#26478)) //<Sebastian Silbermann>// - **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([#26479](facebook/react#26479)) //<Sebastian Silbermann>// - **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([#26501](facebook/react#26501)) //<Sebastian Markbåge>// - **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([#26498](facebook/react#26498)) //<Andrew Clark>// - **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([#26497](facebook/react#26497)) //<Ricky>// - **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([#26490](facebook/react#26490)) //<Ricky>// - **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([#26494](facebook/react#26494)) //<Andrew Clark>// - **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([#26493](facebook/react#26493)) //<Andrew Clark>// - **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([#26491](facebook/react#26491)) //<Andrew Clark>// - **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([#26488](facebook/react#26488)) //<Jan Kassens>// - **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([#26487](facebook/react#26487)) //<Jan Kassens>// - **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([#26434](facebook/react#26434)) //<Andrew Clark>// - **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([#26468](facebook/react#26468)) //<Sebastian Silbermann>// - **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([#26450](facebook/react#26450)) //<Josh Story>// - **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([#26473](facebook/react#26473)) //<dan>// - **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([#26442](facebook/react#26442)) //<Mark Erikson>// - **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([#26437](facebook/react#26437)) //<Rubén Norte>// - **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([#26395](facebook/react#26395)) //<Ricky>// - **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([#26453](facebook/react#26453)) //<Andrew Clark>// - **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([#26457](facebook/react#26457)) //<Sebastian Markbåge>// - **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([#26461](facebook/react#26461)) //<Rubén Norte>// - **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([#26458](facebook/react#26458)) //<Sebastian Markbåge>// - **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([#26455](facebook/react#26455)) //<Leedom>// - **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([#26452](facebook/react#26452)) //<Valor(华洛)>// - **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component ([#26380](facebook/react#26380)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 77ba161...ca01f35 jest_e2e[run_all_tests] bypass-github-export-checks Reviewed By: sammy-SC Differential Revision: D44669450 fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
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Summary: This sync includes the following changes: - **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([facebook#26489](facebook/react#26489)) //<Ricky>// - **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([facebook#26524](facebook/react#26524)) //<Sebastian Markbåge>// - **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([facebook#26474](facebook/react#26474)) //<dan>// - **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([facebook#26523](facebook/react#26523)) //<Sebastian Markbåge>// - **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([facebook#26513](facebook/react#26513)) //<Sebastian Markbåge>// - **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([facebook#26511](facebook/react#26511)) //<Andrew Clark>// - **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([facebook#26510](facebook/react#26510)) //<Joseph Savona>// - **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([facebook#26514](facebook/react#26514)) //<Sebastian Markbåge>// - **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([facebook#26507](facebook/react#26507)) //<Sebastian Markbåge>// - **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([facebook#26509](facebook/react#26509)) //<Andrew Clark>// - **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([facebook#26508](facebook/react#26508)) //<Andrew Clark>// - **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([facebook#26478](facebook/react#26478)) //<Sebastian Silbermann>// - **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([facebook#26479](facebook/react#26479)) //<Sebastian Silbermann>// - **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([facebook#26501](facebook/react#26501)) //<Sebastian Markbåge>// - **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([facebook#26498](facebook/react#26498)) //<Andrew Clark>// - **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([facebook#26497](facebook/react#26497)) //<Ricky>// - **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([facebook#26490](facebook/react#26490)) //<Ricky>// - **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([facebook#26494](facebook/react#26494)) //<Andrew Clark>// - **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([facebook#26493](facebook/react#26493)) //<Andrew Clark>// - **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([facebook#26491](facebook/react#26491)) //<Andrew Clark>// - **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([facebook#26488](facebook/react#26488)) //<Jan Kassens>// - **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([facebook#26487](facebook/react#26487)) //<Jan Kassens>// - **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([facebook#26434](facebook/react#26434)) //<Andrew Clark>// - **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([facebook#26468](facebook/react#26468)) //<Sebastian Silbermann>// - **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([facebook#26450](facebook/react#26450)) //<Josh Story>// - **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([facebook#26473](facebook/react#26473)) //<dan>// - **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([facebook#26442](facebook/react#26442)) //<Mark Erikson>// - **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([facebook#26437](facebook/react#26437)) //<Rubén Norte>// - **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([facebook#26395](facebook/react#26395)) //<Ricky>// - **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([facebook#26453](facebook/react#26453)) //<Andrew Clark>// - **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([facebook#26457](facebook/react#26457)) //<Sebastian Markbåge>// - **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([facebook#26461](facebook/react#26461)) //<Rubén Norte>// - **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([facebook#26458](facebook/react#26458)) //<Sebastian Markbåge>// - **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([facebook#26455](facebook/react#26455)) //<Leedom>// - **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([facebook#26452](facebook/react#26452)) //<Valor(华洛)>// - **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component ([facebook#26380](facebook/react#26380)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 77ba161...ca01f35 jest_e2e[run_all_tests] bypass-github-export-checks Reviewed By: sammy-SC Differential Revision: D44669450 fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
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Summary: This sync includes the following changes: - **[ca01f359b](facebook/react@ca01f359b )**: Remove skipUnmountedBoundaries ([facebook#26489](facebook/react#26489)) //<Ricky>// - **[43a70a610](facebook/react@43a70a610 )**: Limit the meaning of "custom element" to not include `is` ([facebook#26524](facebook/react#26524)) //<Sebastian Markbåge>// - **[1308e49a6](facebook/react@1308e49a6 )**: [Flight Plugin] Scan for "use client" ([facebook#26474](facebook/react#26474)) //<dan>// - **[1a1d61fed](facebook/react@1a1d61fed )**: Warn for ARIA typos on custom elements ([facebook#26523](facebook/react#26523)) //<Sebastian Markbåge>// - **[73deff0d5](facebook/react@73deff0d5 )**: Refactor DOMProperty and CSSProperty ([facebook#26513](facebook/react#26513)) //<Sebastian Markbåge>// - **[2d51251e6](facebook/react@2d51251e6 )**: Clean up deferRenderPhaseUpdateToNextBatch ([facebook#26511](facebook/react#26511)) //<Andrew Clark>// - **[0ffc7f632](facebook/react@0ffc7f632 )**: Update useMemoCache test to confirm that cache persists across errors ([facebook#26510](facebook/react#26510)) //<Joseph Savona>// - **[29a3be78b](facebook/react@29a3be78b )**: Move ReactDOMFloat to react-dom/src/ ([facebook#26514](facebook/react#26514)) //<Sebastian Markbåge>// - **[4c2fc0190](facebook/react@4c2fc0190 )**: Generate safe javascript url instead of throwing with disableJavaScriptURLs is on ([facebook#26507](facebook/react#26507)) //<Sebastian Markbåge>// - **[f0aafa1a7](facebook/react@f0aafa1a7 )**: Convert a few more tests to waitFor test helpers ([facebook#26509](facebook/react#26509)) //<Andrew Clark>// - **[90995ef8b](facebook/react@90995ef8b )**: Delete "triangle" resuming fuzz tester ([facebook#26508](facebook/react#26508)) //<Andrew Clark>// - **[f118b7ceb](facebook/react@f118b7ceb )**: [Flight] Gated test for dropped transport of undefined object values ([facebook#26478](facebook/react#26478)) //<Sebastian Silbermann>// - **[fd0511c72](facebook/react@fd0511c72 )**: [Flight] Add support BigInt support ([facebook#26479](facebook/react#26479)) //<Sebastian Silbermann>// - **[85de6fde5](facebook/react@85de6fde5 )**: Refactor DOM special cases per tags including controlled fields ([facebook#26501](facebook/react#26501)) //<Sebastian Markbåge>// - **[1f5cdf8c7](facebook/react@1f5cdf8c7 )**: Update Suspense fuzz tests to use `act` ([facebook#26498](facebook/react#26498)) //<Andrew Clark>// - **[f62cb39ee](facebook/react@f62cb39ee )**: Make disableSchedulerTimeoutInWorkLoop a static ff ([facebook#26497](facebook/react#26497)) //<Ricky>// - **[41b4714f1](facebook/react@41b4714f1 )**: Remove disableNativeComponentFrames ([facebook#26490](facebook/react#26490)) //<Ricky>// - **[fc90eb636](facebook/react@fc90eb636 )**: Codemod more tests to waitFor pattern ([facebook#26494](facebook/react#26494)) //<Andrew Clark>// - **[e0bbc2662](facebook/react@e0bbc2662 )**: Improve tests that deal with microtasks ([facebook#26493](facebook/react#26493)) //<Andrew Clark>// - **[8faf75193](facebook/react@8faf75193 )**: Codemod some expiration tests to waitForExpired ([facebook#26491](facebook/react#26491)) //<Andrew Clark>// - **[8342a0992](facebook/react@8342a0992 )**: Remove unused feature flag disableSchedulerTimeoutBasedOnReactExpirationTime ([facebook#26488](facebook/react#26488)) //<Jan Kassens>// - **[afea1d0c5](facebook/react@afea1d0c5 )**: [flow] make Flow suppressions explicit on the error ([facebook#26487](facebook/react#26487)) //<Jan Kassens>// - **[768f965de](facebook/react@768f965de )**: Suspensily committing a prerendered tree ([facebook#26434](facebook/react#26434)) //<Andrew Clark>// - **[d12bdcda6](facebook/react@d12bdcda6 )**: Fix Flow types of useEffectEvent ([facebook#26468](facebook/react#26468)) //<Sebastian Silbermann>// - **[73b6435ca](facebook/react@73b6435ca )**: [Float][Fiber] Implement waitForCommitToBeReady for stylesheet resources ([facebook#26450](facebook/react#26450)) //<Josh Story>// - **[175962c10](facebook/react@175962c10 )**: Fix remaining CommonJS imports after Rollup upgrade ([facebook#26473](facebook/react#26473)) //<dan>// - **[909c6dacf](facebook/react@909c6dacf )**: Update Rollup to 3.x ([facebook#26442](facebook/react#26442)) //<Mark Erikson>// - **[9c54b29b4](facebook/react@9c54b29b4 )**: Remove ReactFabricPublicInstance and used definition from ReactNativePrivateInterface ([facebook#26437](facebook/react#26437)) //<Rubén Norte>// - **[f77099b6f](facebook/react@f77099b6f )**: Remove layout effect warning on the server ([facebook#26395](facebook/react#26395)) //<Ricky>// - **[51a7c45f8](facebook/react@51a7c45f8 )**: Bugfix: SuspenseList incorrectly forces a fallback ([facebook#26453](facebook/react#26453)) //<Andrew Clark>// - **[afb3d51dc](facebook/react@afb3d51dc )**: Fix enableClientRenderFallbackOnTextMismatch flag ([facebook#26457](facebook/react#26457)) //<Sebastian Markbåge>// - **[8e17bfd14](facebook/react@8e17bfd14 )**: Make InternalInstanceHandle type opaque in ReactNativeTypes ([facebook#26461](facebook/react#26461)) //<Rubén Norte>// - **[b93b4f074](facebook/react@b93b4f074 )**: Should not throw for children of iframe or object ([facebook#26458](facebook/react#26458)) //<Sebastian Markbåge>// - **[c0b34bc5f](facebook/react@c0b34bc5f )**: chore: update links of docs and api ([facebook#26455](facebook/react#26455)) //<Leedom>// - **[ffb6733ee](facebook/react@ffb6733ee )**: fix docs link for useSyncExternalStore ([facebook#26452](facebook/react#26452)) //<Valor(华洛)>// - **[12a1d140e](facebook/react@12a1d140e )**: Don't prerender siblings of suspended component ([facebook#26380](facebook/react#26380)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions 77ba161...ca01f35 jest_e2e[run_all_tests] bypass-github-export-checks Reviewed By: sammy-SC Differential Revision: D44669450 fbshipit-source-id: f160aad4719a00df3ceeca78d5f3fcd0aa0f8437
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Prerendering a tree (i.e. with Offscreen) should not suspend the commit phase, because the content is not yet visible. However, when revealing a prerendered tree, we should suspend the commit phase if resources in the prerendered tree haven't finished loading yet. To do this properly, we need to visit all the visible nodes in the tree that might possibly suspend. This includes nodes in the current tree, because even though they were already "mounted", the resources might not have loaded yet, because we didn't suspend when it was prerendered. We will need to add this capability to the Offscreen component's "manual" mode, too. Something like a `ready()` method that returns a promise that resolves when the tree has fully loaded. Also includes some fixes to #26450. See PR for details. DiffTrain build for commit 768f965.
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Prerendering a tree (i.e. with Offscreen) should not suspend the commit phase, because the content is not yet visible. However, when revealing a prerendered tree, we should suspend the commit phase if resources in the prerendered tree haven't finished loading yet.
To do this properly, we need to visit all the visible nodes in the tree that might possibly suspend. This includes nodes in the current tree, because even though they were already "mounted", the resources might not have loaded yet, because we didn't suspend when it was prerendered.
We will need to add this capability to the Offscreen component's "manual" mode, too. Something like a
ready()method that returns a promise that resolves when the tree has fully loaded.