Make root.unmount() synchronous #22444
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When you call in `flushSync` from an effect, React fires a warning. I've moved the implementation of this warning out of the reconciler and into React DOM. `flushSync` is a renderer API, not an isomorphic API, because it has behavior that was designed specifically for the constraints of React DOM. The equivalent API in a different renderer may not be the same. For example, React Native has a different threading model than the browser, so it might not make sense to expose a `flushSync` API to the JavaScript thread.
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When you unmount a root, the internal state that React stores on the DOM node is immediately cleared. So, we should also synchronously delete the React tree. You should be able to create a new root using the same container.
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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
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Apr 15, 2022
* Move flushSync warning to React DOM When you call in `flushSync` from an effect, React fires a warning. I've moved the implementation of this warning out of the reconciler and into React DOM. `flushSync` is a renderer API, not an isomorphic API, because it has behavior that was designed specifically for the constraints of React DOM. The equivalent API in a different renderer may not be the same. For example, React Native has a different threading model than the browser, so it might not make sense to expose a `flushSync` API to the JavaScript thread. * Make root.unmount() synchronous When you unmount a root, the internal state that React stores on the DOM node is immediately cleared. So, we should also synchronously delete the React tree. You should be able to create a new root using the same container.
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When you unmount a root, the internal state that React stores on the DOM node is immediately cleared. So, we should also synchronously delete the React tree. You should be able to create a new root using the same container.