Implement Offscreen in Fizz #24988
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Implement Offscreen in Fizz #24988
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facebook-github-bot
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Jul 25, 2022
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Based on an out-of-band discussion, I'm going to change this to skip server rendering hidden Offscreen trees instead |
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During server rendering, a visible Offscreen subtree acts exactly like a fragment: a pure indirection. A hidden Offscreen subtree is not server rendered at all. It's ignored during hydration, too. Prerendering happens only on the client. We considered prerendering hidden trees on the server, too, but our conclusion is that it's a waste of bytes and server computation. We can't think of any compelling cases where it's the right trade off. (If we ever change our mind, though, the way we'll likely model it is to treat it as if it's a Suspense boundary with an empty fallback.)
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Summary: This sync includes the following changes: - **[4ea064eb0](facebook/react@4ea064eb0 )**: Don't fire passive effects during initial mount of a hidden Offscreen tree ([#24967](facebook/react#24967)) //<Andrew Clark>// - **[2c7dea736](facebook/react@2c7dea736 )**: Implement Offscreen in Fizz ([#24988](facebook/react#24988)) //<Andrew Clark>// - **[49f8254d6](facebook/react@49f8254d6 )**: Bug fix for <App /> vs. <Counter /> ([#24972](facebook/react#24972)) //<davidrenne>// - **[6b28bc9c5](facebook/react@6b28bc9c5 )**: test: Throw custom error instead of relying on runtime error ([#24946](facebook/react#24946)) //<Sebastian Silbermann>// - **[9bd0dd4c1](facebook/react@9bd0dd4c1 )**: test(react-debug-tools): Improve coverage of currentDispatcher.current setter ([#24945](facebook/react#24945)) //<Sebastian Silbermann>// - **[59bc52a16](facebook/react@59bc52a16 )**: Add 4.5.0 release to eslint rules CHANGELOG ([#24853](facebook/react#24853)) //<Sebastian Silbermann>// - **[cfb6cfa25](facebook/react@cfb6cfa25 )**: Reused components commit with timing as new ones //<Andrew Clark>// - **[679eea328](facebook/react@679eea328 )**: Extract layout effects to separate functions //<Andrew Clark>// - **[41287d447](facebook/react@41287d447 )**: Use recursion to traverse during "reappear layout" phase //<Andrew Clark>// - **[697702bf3](facebook/react@697702bf3 )**: Use recursion to traverse during "disappear layout" phase //<Andrew Clark>// - **[02206099a](facebook/react@02206099a )**: Use recursion to traverse during passive unmount phase ([#24918](facebook/react#24918)) //<Andrew Clark>// - **[f62949519](facebook/react@f62949519 )**: [Transition Tracing] Rename transitionCallbacks to unstable_transitionCallbacks ([#24920](facebook/react#24920)) //<Luna Ruan>// - **[7a4336c40](facebook/react@7a4336c40 )**: Use recursion to traverse during passive mount phase //<Andrew Clark>// - **[bb1357b38](facebook/react@bb1357b38 )**: Wrap try-catch directly around each user function //<Andrew Clark>// - **[de3c06984](facebook/react@de3c06984 )**: Move flag check into each switch case //<Andrew Clark>// - **[f5916d15b](facebook/react@f5916d15b )**: [Transition Tracing][Code Cleanup] Delete Marker Name Change Tests ([#24908](facebook/react#24908)) //<Luna Ruan>// - **[fa20b319f](facebook/react@fa20b319f )**: [Transition Tracing] Code Cleanup ([#24880](facebook/react#24880)) //<Luna Ruan>// - **[5e8c1961c](facebook/react@5e8c1961c )**: [Transition Tracing] onMarkerProgress ([#24861](facebook/react#24861)) //<Luna Ruan>// - **[b641d0209](facebook/react@b641d0209 )**: Use recursion to traverse during layout phase //<Andrew Clark>// - **[a1b1e391e](facebook/react@a1b1e391e )**: Wrap try-catch directly around each user function //<Andrew Clark>// - **[3df7e8f5d](facebook/react@3df7e8f5d )**: Move flag check into each switch case //<Andrew Clark>// - **[b8c96b136](facebook/react@b8c96b136 )**: Move ref commit effects inside switch statement //<Andrew Clark>// - **[e225fa43a](facebook/react@e225fa43a )**: [Transition Tracing] Don't call transition callbacks if no transition name specified ([#24887](facebook/react#24887)) //<Luna Ruan>// - **[dd2d65227](facebook/react@dd2d65227 )**: [Transition Tracing] Tracing Marker Name Change in Update Warning ([#24873](facebook/react#24873)) //<Luna Ruan>// - **[80208e769](facebook/react@80208e769 )**: [Transition Tracing] Add onTransitionProgress Callback ([#24833](facebook/react#24833)) //<Luna Ruan>// - **[30eb267ab](facebook/react@30eb267ab )**: Land forked reconciler changes ([#24878](facebook/react#24878)) //<Andrew Clark>// - **[5e4e2dae0](facebook/react@5e4e2dae0 )**: Defer setState callbacks until component is visible ([#24872](facebook/react#24872)) //<Andrew Clark>// - **[8e35b5060](facebook/react@8e35b5060 )**: [Transition Tracing] Refactor Code to Remove OffscreeInstance TODOs ([#24855](facebook/react#24855)) //<Luna Ruan>// - **[deab1263a](facebook/react@deab1263a )**: [Transition Tracing] Change Transition Type Passed Pending Transitions ([#24856](facebook/react#24856)) //<Luna Ruan>// - **[82e9e9909](facebook/react@82e9e9909 )**: Suspending inside a hidden tree should not cause fallbacks to appear ([#24699](facebook/react#24699)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions c1f5884...4ea064e jest_e2e[run_all_tests] Reviewed By: philIip, NickGerleman Differential Revision: D39305648 fbshipit-source-id: 627ead5035c77fbc902b306e17897e425ad7fb99
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During server rendering, a visible Offscreen subtree acts exactly like a fragment: a pure indirection. A hidden Offscreen subtree is not server rendered at all. It's ignored during hydration, too. Prerendering happens only on the client. We considered prerendering hidden trees on the server, too, but our conclusion is that it's a waste of bytes and server computation. We can't think of any compelling cases where it's the right trade off. (If we ever change our mind, though, the way we'll likely model it is to treat it as if it's a Suspense boundary with an empty fallback.)
OlimpiaZurek
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May 22, 2023
Summary: This sync includes the following changes: - **[4ea064eb0](facebook/react@4ea064eb0 )**: Don't fire passive effects during initial mount of a hidden Offscreen tree ([facebook#24967](facebook/react#24967)) //<Andrew Clark>// - **[2c7dea736](facebook/react@2c7dea736 )**: Implement Offscreen in Fizz ([facebook#24988](facebook/react#24988)) //<Andrew Clark>// - **[49f8254d6](facebook/react@49f8254d6 )**: Bug fix for <App /> vs. <Counter /> ([facebook#24972](facebook/react#24972)) //<davidrenne>// - **[6b28bc9c5](facebook/react@6b28bc9c5 )**: test: Throw custom error instead of relying on runtime error ([facebook#24946](facebook/react#24946)) //<Sebastian Silbermann>// - **[9bd0dd4c1](facebook/react@9bd0dd4c1 )**: test(react-debug-tools): Improve coverage of currentDispatcher.current setter ([facebook#24945](facebook/react#24945)) //<Sebastian Silbermann>// - **[59bc52a16](facebook/react@59bc52a16 )**: Add 4.5.0 release to eslint rules CHANGELOG ([facebook#24853](facebook/react#24853)) //<Sebastian Silbermann>// - **[cfb6cfa25](facebook/react@cfb6cfa25 )**: Reused components commit with timing as new ones //<Andrew Clark>// - **[679eea328](facebook/react@679eea328 )**: Extract layout effects to separate functions //<Andrew Clark>// - **[41287d447](facebook/react@41287d447 )**: Use recursion to traverse during "reappear layout" phase //<Andrew Clark>// - **[697702bf3](facebook/react@697702bf3 )**: Use recursion to traverse during "disappear layout" phase //<Andrew Clark>// - **[02206099a](facebook/react@02206099a )**: Use recursion to traverse during passive unmount phase ([facebook#24918](facebook/react#24918)) //<Andrew Clark>// - **[f62949519](facebook/react@f62949519 )**: [Transition Tracing] Rename transitionCallbacks to unstable_transitionCallbacks ([facebook#24920](facebook/react#24920)) //<Luna Ruan>// - **[7a4336c40](facebook/react@7a4336c40 )**: Use recursion to traverse during passive mount phase //<Andrew Clark>// - **[bb1357b38](facebook/react@bb1357b38 )**: Wrap try-catch directly around each user function //<Andrew Clark>// - **[de3c06984](facebook/react@de3c06984 )**: Move flag check into each switch case //<Andrew Clark>// - **[f5916d15b](facebook/react@f5916d15b )**: [Transition Tracing][Code Cleanup] Delete Marker Name Change Tests ([facebook#24908](facebook/react#24908)) //<Luna Ruan>// - **[fa20b319f](facebook/react@fa20b319f )**: [Transition Tracing] Code Cleanup ([facebook#24880](facebook/react#24880)) //<Luna Ruan>// - **[5e8c1961c](facebook/react@5e8c1961c )**: [Transition Tracing] onMarkerProgress ([facebook#24861](facebook/react#24861)) //<Luna Ruan>// - **[b641d0209](facebook/react@b641d0209 )**: Use recursion to traverse during layout phase //<Andrew Clark>// - **[a1b1e391e](facebook/react@a1b1e391e )**: Wrap try-catch directly around each user function //<Andrew Clark>// - **[3df7e8f5d](facebook/react@3df7e8f5d )**: Move flag check into each switch case //<Andrew Clark>// - **[b8c96b136](facebook/react@b8c96b136 )**: Move ref commit effects inside switch statement //<Andrew Clark>// - **[e225fa43a](facebook/react@e225fa43a )**: [Transition Tracing] Don't call transition callbacks if no transition name specified ([facebook#24887](facebook/react#24887)) //<Luna Ruan>// - **[dd2d65227](facebook/react@dd2d65227 )**: [Transition Tracing] Tracing Marker Name Change in Update Warning ([facebook#24873](facebook/react#24873)) //<Luna Ruan>// - **[80208e769](facebook/react@80208e769 )**: [Transition Tracing] Add onTransitionProgress Callback ([facebook#24833](facebook/react#24833)) //<Luna Ruan>// - **[30eb267ab](facebook/react@30eb267ab )**: Land forked reconciler changes ([facebook#24878](facebook/react#24878)) //<Andrew Clark>// - **[5e4e2dae0](facebook/react@5e4e2dae0 )**: Defer setState callbacks until component is visible ([facebook#24872](facebook/react#24872)) //<Andrew Clark>// - **[8e35b5060](facebook/react@8e35b5060 )**: [Transition Tracing] Refactor Code to Remove OffscreeInstance TODOs ([facebook#24855](facebook/react#24855)) //<Luna Ruan>// - **[deab1263a](facebook/react@deab1263a )**: [Transition Tracing] Change Transition Type Passed Pending Transitions ([facebook#24856](facebook/react#24856)) //<Luna Ruan>// - **[82e9e9909](facebook/react@82e9e9909 )**: Suspending inside a hidden tree should not cause fallbacks to appear ([facebook#24699](facebook/react#24699)) //<Andrew Clark>// Changelog: [General][Changed] - React Native sync for revisions c1f5884...4ea064e jest_e2e[run_all_tests] Reviewed By: philIip, NickGerleman Differential Revision: D39305648 fbshipit-source-id: 627ead5035c77fbc902b306e17897e425ad7fb99
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During server rendering, a visible Offscreen subtree acts exactly like a fragment: a pure indirection.
A hidden Offscreen subtree is not server rendered at all. It's ignored during hydration, too. Prerendering happens only on the client. We considered prerendering hidden trees on the server, too, but our conclusion is that it's a waste of bytes and server computation. We can't think of any compelling cases where it's the right trade off. (If we ever change our mind, though, the way we'll likely model it is to treat it as if it's a Suspense boundary with an empty fallback.)