Add more feature flag checks #24037
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Add more feature flag checks #24037
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sebmarkbage
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Mar 8, 2022
| mode |= DebugTracingMode; | ||
| break; | ||
| } | ||
| // eslint-disable-next-line no-fallthrough |
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The trick is to place these at the bottom so if the condition is false it's the same as default which means that the case is unnecessary which Closure is smart enough to understand but not Rollup.
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Comparing: e09518e...ba7f8ef Critical size changesIncludes critical production bundles, as well as any change greater than 2%:
Significant size changesIncludes any change greater than 0.2%: Expand to show
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salazarm
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Mar 8, 2022
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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
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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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This strips some more content out of the stable build.
A neat trick for finding missing feature flag checks is to find Symbol.for usages that shouldn't be there.
Unfortunately these Symbols don't get DCE. I think that's because they're still used in
casestatements.Rollout removes most of our Symbol.for calls but it's not smart enough in all cases. Closure doesn't seem smart enough to know it's not a side-effect. So the net effect is that we still have some unused
Symbol.for(...)calls in the bundle. After this change they're not used though.