[Fizz] Don't flush empty segments #24054
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Before this change, we would sometimes write segments without any content in them. For example for a Suspense boundary that immediately suspends we might emit something like: <div hidden id="123"> <template id="456"></template> </div> Where the outer div is just a temporary wrapper and the inner one is a placeholder for something to be added later. This serves no purpose. We should ideally have a heuristic that holds back segments based on byte size and time. However, this is a straight forward clear win for now.
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Notably, if two children suspends, it'll still emit: <div hidden id="123">
<template id="456"></template>
<template id="789"></template>
</div>That way each of those can be filled in independently. |
salazarm
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facebook-github-bot
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Mar 24, 2022
Summary: This sync includes the following changes: - **[3f8990898](facebook/react@3f8990898 )**: Fix test-build-devtools if build was generated by build-for-devtools ([#24088](facebook/react#24088)) //<Sebastian Silbermann>// - **[577f2de46](facebook/react@577f2de46 )**: enableCacheElement flag ([#24131](facebook/react#24131)) //<David McCabe>// - **[2e0d86d22](facebook/react@2e0d86d22 )**: Allow updating dehydrated root at lower priority without forcing client render ([#24082](facebook/react#24082)) //<Andrew Clark>// - **[dbe9e732a](facebook/react@dbe9e732a )**: Avoid conditions where control flow is sufficient ([#24126](facebook/react#24126)) //<Sebastian Markbåge>// - **[b075f9742](facebook/react@b075f9742 )**: Fix dispatch config type for skipBubbling ([#24109](facebook/react#24109)) //<Luna>// - **[ef23a9ee8](facebook/react@ef23a9ee8 )**: Flag for text hydration mismatch ([#24107](facebook/react#24107)) //<salazarm>// - **[0412f0c1a](facebook/react@0412f0c1a )**: add offscreen state node ([#24026](facebook/react#24026)) //<Luna Ruan>// - **[43eb28339](facebook/react@43eb28339 )**: Add skipBubbling property to dispatch config ([#23366](facebook/react#23366)) //<Luna>// - **[832e2987e](facebook/react@832e2987e )**: Revert accdientally merged PR ([#24081](facebook/react#24081)) //<Andrew Clark>// - **[02b65fd8c](facebook/react@02b65fd8c )**: Allow updates at lower pri without forcing client render //<Andrew Clark>// - **[83b941a51](facebook/react@83b941a51 )**: Add isRootDehydrated function //<Andrew Clark>// - **[c8e4789e2](facebook/react@c8e4789e2 )**: Pass children to hydration root constructor //<Andrew Clark>// - **[581f0c42e](facebook/react@581f0c42e )**: [Flight] add support for Lazy components in Flight server ([#24068](facebook/react#24068)) //<Josh Story>// - **[72a933d28](facebook/react@72a933d28 )**: Gate legacy hidden ([#24047](facebook/react#24047)) //<Sebastian Markbåge>// - **[b9de50d2f](facebook/react@b9de50d2f )**: Update test to reset modules instead of using private state ([#24055](facebook/react#24055)) //<Sebastian Markbåge>// - **[c91892ec3](facebook/react@c91892ec3 )**: [Fizz] Don't flush empty segments ([#24054](facebook/react#24054)) //<Sebastian Markbåge>// - **[d5f1b067c](facebook/react@d5f1b067c )**: [ServerContext] Flight support for ServerContext ([#23244](facebook/react#23244)) //<salazarm>// - **[6edd55a3f](facebook/react@6edd55a3f )**: Gate unstable_expectedLoadTime on enableCPUSuspense ([#24038](facebook/react#24038)) //<Sebastian Markbåge>// - **[57799b912](facebook/react@57799b912 )**: Add more feature flag checks ([#24037](facebook/react#24037)) //<Sebastian Markbåge>// - **[e09518e5b](facebook/react@e09518e5b )**: [Fizz] write chunks to a buffer with no re-use ([#24034](facebook/react#24034)) //<Josh Story>// - **[14c2be8da](facebook/react@14c2be8da )**: Rename Node SSR Callbacks to onShellReady/onAllReady and Other Fixes ([#24030](facebook/react#24030)) //<Sebastian Markbåge>// - **[cb1e7b1c6](facebook/react@cb1e7b1c6 )**: Move onCompleteAll to .allReady Promise ([#24025](facebook/react#24025)) //<Sebastian Markbåge>// - **[566285761](facebook/react@566285761 )**: [Fizz] Export debug function for FB ([#24024](facebook/react#24024)) //<salazarm>// - **[05c283c3c](facebook/react@05c283c3c )**: Fabric HostComponent as EventEmitter: support add/removeEventListener (unstable only) ([#23386](facebook/react#23386)) //<Joshua Gross>// - **[08644348b](facebook/react@08644348b )**: Added unit Tests in the ReactART, increasing the code coverage ([#23195](facebook/react#23195)) //<BIKI DAS>// - **[feefe437f](facebook/react@feefe437f )**: Refactor Cache Code ([#23393](facebook/react#23393)) //<Luna Ruan>// Changelog: [General][Changed] - React Native sync for revisions 1780659...1159ff6 jest_e2e[run_all_tests] Reviewed By: lunaleaps Differential Revision: D34928167 fbshipit-source-id: 8c386f2be5871981d217ab9a514892ed88eafcfb
zhengjitf
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Before this change, we would sometimes write segments without any content in them. For example for a Suspense boundary that immediately suspends we might emit something like: <div hidden id="123"> <template id="456"></template> </div> Where the outer div is just a temporary wrapper and the inner one is a placeholder for something to be added later. This serves no purpose. We should ideally have a heuristic that holds back segments based on byte size and time. However, this is a straight forward clear win for now.
Saadnajmi
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Jan 15, 2023
Summary: This sync includes the following changes: - **[3f8990898](facebook/react@3f8990898 )**: Fix test-build-devtools if build was generated by build-for-devtools ([facebook#24088](facebook/react#24088)) //<Sebastian Silbermann>// - **[577f2de46](facebook/react@577f2de46 )**: enableCacheElement flag ([facebook#24131](facebook/react#24131)) //<David McCabe>// - **[2e0d86d22](facebook/react@2e0d86d22 )**: Allow updating dehydrated root at lower priority without forcing client render ([facebook#24082](facebook/react#24082)) //<Andrew Clark>// - **[dbe9e732a](facebook/react@dbe9e732a )**: Avoid conditions where control flow is sufficient ([facebook#24126](facebook/react#24126)) //<Sebastian Markbåge>// - **[b075f9742](facebook/react@b075f9742 )**: Fix dispatch config type for skipBubbling ([facebook#24109](facebook/react#24109)) //<Luna>// - **[ef23a9ee8](facebook/react@ef23a9ee8 )**: Flag for text hydration mismatch ([facebook#24107](facebook/react#24107)) //<salazarm>// - **[0412f0c1a](facebook/react@0412f0c1a )**: add offscreen state node ([facebook#24026](facebook/react#24026)) //<Luna Ruan>// - **[43eb28339](facebook/react@43eb28339 )**: Add skipBubbling property to dispatch config ([facebook#23366](facebook/react#23366)) //<Luna>// - **[832e2987e](facebook/react@832e2987e )**: Revert accdientally merged PR ([facebook#24081](facebook/react#24081)) //<Andrew Clark>// - **[02b65fd8c](facebook/react@02b65fd8c )**: Allow updates at lower pri without forcing client render //<Andrew Clark>// - **[83b941a51](facebook/react@83b941a51 )**: Add isRootDehydrated function //<Andrew Clark>// - **[c8e4789e2](facebook/react@c8e4789e2 )**: Pass children to hydration root constructor //<Andrew Clark>// - **[581f0c42e](facebook/react@581f0c42e )**: [Flight] add support for Lazy components in Flight server ([facebook#24068](facebook/react#24068)) //<Josh Story>// - **[72a933d28](facebook/react@72a933d28 )**: Gate legacy hidden ([facebook#24047](facebook/react#24047)) //<Sebastian Markbåge>// - **[b9de50d2f](facebook/react@b9de50d2f )**: Update test to reset modules instead of using private state ([facebook#24055](facebook/react#24055)) //<Sebastian Markbåge>// - **[c91892ec3](facebook/react@c91892ec3 )**: [Fizz] Don't flush empty segments ([facebook#24054](facebook/react#24054)) //<Sebastian Markbåge>// - **[d5f1b067c](facebook/react@d5f1b067c )**: [ServerContext] Flight support for ServerContext ([facebook#23244](facebook/react#23244)) //<salazarm>// - **[6edd55a3f](facebook/react@6edd55a3f )**: Gate unstable_expectedLoadTime on enableCPUSuspense ([facebook#24038](facebook/react#24038)) //<Sebastian Markbåge>// - **[57799b912](facebook/react@57799b912 )**: Add more feature flag checks ([facebook#24037](facebook/react#24037)) //<Sebastian Markbåge>// - **[e09518e5b](facebook/react@e09518e5b )**: [Fizz] write chunks to a buffer with no re-use ([facebook#24034](facebook/react#24034)) //<Josh Story>// - **[14c2be8da](facebook/react@14c2be8da )**: Rename Node SSR Callbacks to onShellReady/onAllReady and Other Fixes ([facebook#24030](facebook/react#24030)) //<Sebastian Markbåge>// - **[cb1e7b1c6](facebook/react@cb1e7b1c6 )**: Move onCompleteAll to .allReady Promise ([facebook#24025](facebook/react#24025)) //<Sebastian Markbåge>// - **[566285761](facebook/react@566285761 )**: [Fizz] Export debug function for FB ([facebook#24024](facebook/react#24024)) //<salazarm>// - **[05c283c3c](facebook/react@05c283c3c )**: Fabric HostComponent as EventEmitter: support add/removeEventListener (unstable only) ([facebook#23386](facebook/react#23386)) //<Joshua Gross>// - **[08644348b](facebook/react@08644348b )**: Added unit Tests in the ReactART, increasing the code coverage ([facebook#23195](facebook/react#23195)) //<BIKI DAS>// - **[feefe437f](facebook/react@feefe437f )**: Refactor Cache Code ([facebook#23393](facebook/react#23393)) //<Luna Ruan>// Changelog: [General][Changed] - React Native sync for revisions 1780659...1159ff6 jest_e2e[run_all_tests] Reviewed By: lunaleaps Differential Revision: D34928167 fbshipit-source-id: 8c386f2be5871981d217ab9a514892ed88eafcfb
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Before this change, we would sometimes write segments without any content in them. For example for a Suspense boundary that immediately suspends we might emit something like:
Where the outer div is just a temporary wrapper and the inner one is a placeholder for something to be added later.
This serves no purpose.
We should ideally have a heuristic that holds back segments based on byte size and time. However, this is a straight forward clear win for now.
The root most completed segments of a boundary are queued onto it. I simply avoid queuing the segment if it's empty and instead queue its child or waits for it to complete.