Ship partial-prerendering APIs to Canary #34633
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All OSS builds have these entrypoints now
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eps1lon
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Sep 28, 2025
| result.prelude.pipe(writable); | ||
| }); | ||
| expect(getVisibleChildren(container)).toEqual(undefined); | ||
| expect(errors).toEqual([]); |
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The test used to fail due to prerenderToNodeStream not existing. Since that API exists everywhere now, the only error happens in onError calling console.error(postponedValue). However, we ignore console.error(someErrorInstance) in our testing infra and it would take a while to update all the tests to also assert on prod errors.
In dev the test failed because we also called console.error with the environment name
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| if (__EXPERIMENTAL__) { | ||
| const useTransitionHelper = () => React.useTransition(); | ||
| const useDeferredValueHelper = () => | ||
| React.useDeferredValue(0, {timeoutMs: 1000}); | ||
| const useTransitionHelper = () => React.useTransition(); | ||
| const useDeferredValueHelper = () => | ||
| React.useDeferredValue(0, {timeoutMs: 1000}); | ||
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| orderedHooks.push(useTransitionHelper); | ||
| orderedHooks.push(useDeferredValueHelper); | ||
| orderedHooks.push(useTransitionHelper); | ||
| orderedHooks.push(useDeferredValueHelper); | ||
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| hooksInList.push(useTransitionHelper); | ||
| hooksInList.push(useDeferredValueHelper); | ||
| } | ||
| hooksInList.push(useTransitionHelper); | ||
| hooksInList.push(useDeferredValueHelper); | ||
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drive-by fix when looking for things gated on experimental.
sebmarkbage
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Oct 1, 2025
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Also enables these APIs for FB builds.
Docs are work-in-progress.