Implement getServerSnapshot in userspace shim #22359
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salazarm
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Sep 20, 2021
| jest.mock('react', () => { | ||
| const { | ||
| // eslint-disable-next-line no-unused-vars | ||
| startTransition: _, |
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just curious why do you need to remove these fields for the test?
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It's to simulate a build of React 17, which includes neither useSyncExternalStore nor startTransition.
The reason startTransition is relevant is because I use it as a heuristic to check whether you're using an outdated alpha of React 18: https://github.com/facebook/react/blob/main/packages/use-sync-external-store/src/useSyncExternalStore.js#L49-L61
The eventual plan is to load a copy of React 17 from npm and test the shim using that.
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Idea is that eventually we'll run these tests against an actual build of React DOM 17 to test backwards compatibility.
If the DOM is not present, we assume that we are running in a server environment and return the result of `getServerSnapshot`. This heuristic doesn't work in React Native, so we'll need to provide a separate native build (using the `.native` extension). I've left this for a follow-up. We can't call `getServerSnapshot` on the client, because in versions of React before 18, there's no built-in mechanism to detect whether we're hydrating. To avoid a server mismatch warning, users must account for this themselves and return the correct value inside `getSnapshot`. Note that none of this is relevant to the built-in API that is being added in 18. This only affects the userspace shim that is provided for backwards compatibility with versions 16 and 17.
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facebook-github-bot
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Oct 12, 2021
Summary: This sync includes the following changes: - **[579c008a7](facebook/react@579c008a7 )**: [Fizz/Flight] pipeToNodeWritable(..., writable).startWriting() -> renderToPipeableStream(...).pipe(writable) ([#22450](facebook/react#22450)) //<Sebastian Markbåge>// - **[f2c381131](facebook/react@f2c381131 )**: fix: useSyncExternalStoreExtra ([#22500](facebook/react#22500)) //<Daishi Kato>// - **[0ecbbe142](facebook/react@0ecbbe142 )**: Sync hydrate discrete events in capture phase and dont replay discrete events ([#22448](facebook/react#22448)) //<salazarm>// - **[a724a3b57](facebook/react@a724a3b57 )**: [RFC] Codemod invariant -> throw new Error ([#22435](facebook/react#22435)) //<Andrew Clark>// - **[201af81b0](facebook/react@201af81b0 )**: Release pooled cache reference in complete/unwind ([#22464](facebook/react#22464)) //<Joseph Savona>// - **[033efe731](facebook/react@033efe731 )**: Call get snapshot in useSyncExternalStore server shim ([#22453](facebook/react#22453)) //<salazarm>// - **[7843b142a](facebook/react@7843b142a )**: [Fizz/Flight] Pass in Destination lazily to startFlowing instead of in createRequest ([#22449](facebook/react#22449)) //<Sebastian Markbåge>// - **[d9fb383d6](facebook/react@d9fb383d6 )**: Extract queueing logic into shared functions ([#22452](facebook/react#22452)) //<Andrew Clark>// - **[9175f4d15](facebook/react@9175f4d15 )**: Scheduling Profiler: Show Suspense resource .displayName ([#22451](facebook/react#22451)) //<Brian Vaughn>// - **[eba248c39](facebook/react@eba248c39 )**: [Fizz/Flight] Remove reentrancy hack ([#22446](facebook/react#22446)) //<Sebastian Markbåge>// - **[66388150e](facebook/react@66388150e )**: Remove usereducer eager bailout ([#22445](facebook/react#22445)) //<Joseph Savona>// - **[d3e086932](facebook/react@d3e086932 )**: Make root.unmount() synchronous ([#22444](facebook/react#22444)) //<Andrew Clark>// - **[2cc6d79c9](facebook/react@2cc6d79c9 )**: Rename onReadyToStream to onCompleteShell ([#22443](facebook/react#22443)) //<Sebastian Markbåge>// - **[c88fb49d3](facebook/react@c88fb49d3 )**: Improve DEV errors if string coercion throws (Temporal.*, Symbol, etc.) ([#22064](facebook/react#22064)) //<Justin Grant>// - **[05726d72c](facebook/react@05726d72c )**: [Fix] Errors should not "unsuspend" a transition ([#22423](facebook/react#22423)) //<Andrew Clark>// - **[3746eaf98](facebook/react@3746eaf98 )**: Packages/React/src/ReactLazy ---> changing -1 to unintialized ([#22421](facebook/react#22421)) //<BIKI DAS>// - **[04ccc01d9](facebook/react@04ccc01d9 )**: Hydration errors should force a client render ([#22416](facebook/react#22416)) //<Andrew Clark>// - **[029fdcebb](facebook/react@029fdcebb )**: root.hydrate -> root.isDehydrated ([#22420](facebook/react#22420)) //<Andrew Clark>// - **[af87f5a83](facebook/react@af87f5a83 )**: Scheduling Profiler marks should include thrown Errors ([#22417](facebook/react#22417)) //<Brian Vaughn>// - **[d47339ea3](facebook/react@d47339ea3 )**: [Fizz] Remove assignID mechanism ([#22410](facebook/react#22410)) //<Sebastian Markbåge>// - **[3a50d9557](facebook/react@3a50d9557 )**: Never attach ping listeners in legacy Suspense ([#22407](facebook/react#22407)) //<Andrew Clark>// - **[82c8fa90b](facebook/react@82c8fa90b )**: Add back useMutableSource temporarily ([#22396](facebook/react#22396)) //<Andrew Clark>// - **[5b57bc6e3](facebook/react@5b57bc6e3 )**: [Draft] don't patch console during first render ([#22308](facebook/react#22308)) //<Luna Ruan>// - **[cf07c3df1](facebook/react@cf07c3df1 )**: Delete all but one `build2` reference ([#22391](facebook/react#22391)) //<Andrew Clark>// - **[bb0d06935](facebook/react@bb0d06935 )**: [build2 -> build] Local scripts //<Andrew Clark>// - **[0c81d347b](facebook/react@0c81d347b )**: Write artifacts to `build` instead of `build2` //<Andrew Clark>// - **[4da03c9fb](facebook/react@4da03c9fb )**: useSyncExternalStore React Native version ([#22367](facebook/react#22367)) //<salazarm>// - **[48d475c9e](facebook/react@48d475c9e )**: correct typos ([#22294](facebook/react#22294)) //<Bowen>// - **[cb6c619c0](facebook/react@cb6c619c0 )**: Remove Fiber fields that were used for hydrating useMutableSource ([#22368](facebook/react#22368)) //<Sebastian Silbermann>// - **[64e70f82e](facebook/react@64e70f82e )**: [Fizz] add avoidThisFallback support ([#22318](facebook/react#22318)) //<salazarm>// - **[3ee7a004e](facebook/react@3ee7a004e )**: devtools: Display actual ReactDOM API name in root type ([#22363](facebook/react#22363)) //<Sebastian Silbermann>// - **[79b8fc667](facebook/react@79b8fc667 )**: Implement getServerSnapshot in userspace shim ([#22359](facebook/react#22359)) //<Andrew Clark>// - **[86b3e2461](facebook/react@86b3e2461 )**: Implement useSyncExternalStore on server ([#22347](facebook/react#22347)) //<Andrew Clark>// - **[8209de269](facebook/react@8209de269 )**: Delete useMutableSource implementation ([#22292](facebook/react#22292)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions e8feb11...afcb9cd jest_e2e[run_all_tests] Reviewed By: yungsters Differential Revision: D31541359 fbshipit-source-id: c35941bc303fdf55cb061e9996200dc868a6f2af
zhengjitf
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Apr 15, 2022
* Convert useSES shim tests to use React DOM Idea is that eventually we'll run these tests against an actual build of React DOM 17 to test backwards compatibility. * Implement getServerSnapshot in userspace shim If the DOM is not present, we assume that we are running in a server environment and return the result of `getServerSnapshot`. This heuristic doesn't work in React Native, so we'll need to provide a separate native build (using the `.native` extension). I've left this for a follow-up. We can't call `getServerSnapshot` on the client, because in versions of React before 18, there's no built-in mechanism to detect whether we're hydrating. To avoid a server mismatch warning, users must account for this themselves and return the correct value inside `getSnapshot`. Note that none of this is relevant to the built-in API that is being added in 18. This only affects the userspace shim that is provided for backwards compatibility with versions 16 and 17.
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If the DOM is not present, we assume that we are running in a server environment and return the result of
getServerSnapshot.This heuristic doesn't work in React Native, so we'll need to provide a separate native build (using the
.nativeextension). I've left this for a follow-up.We can't call
getServerSnapshoton the client, because in versions of React before 18, there's no built-in mechanism to detect whether we're hydrating. To avoid a server mismatch warning, users must account for this themselves and return the correct value insidegetSnapshot.Note that none of this is relevant to the built-in API that is being added in 18. This only affects the userspace shim that is provided for backwards compatibility with versions 16 and 17.