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# Affected flags: ### alwaysThrottleRetries In RN OSS changed from `true` to `false`. This is what FB build uses. This flag was a root cause for big perf regression internally. ### enableDeferRootSchedulingToMicrotask In RN OSS build changed from `true` to `false`. This is what FB build uses. ### debugRenderPhaseSideEffectsForStrictMode Changed from true to __DEV__ in FB and OSS build. The flag is only used in debug builds and was previously `false` in RN OSS builds ### enableUnifiedSyncLane Changed from `__VARIANT__` to `true` in FB build. This is what OSS build uses. This flag is shipped internally. cc @tyao1 ### enableLegacyHidden In RN FB changed from `true` to `false`. This is what OSS uses. ### allowConcurrentByDefault In RN FB changed from `true` to `false`. I ran `yarn flags --diff rn rn-fb` to get the difference between feature flags and unify them. ## Before ``` yarn run v1.22.19 $ node ./scripts/flags/flags.js --diff rn rn-fb ┌───────────────────────────────────────────────┬────────┬───────┐ │ (index) │ RN OSS │ RN FB │ ├───────────────────────────────────────────────┼────────┼───────┤ │ allowConcurrentByDefault │ '❌' │ '✅' │ │ debugRenderPhaseSideEffectsForStrictMode │ '❌' │ '✅' │ │ disableModulePatternComponents │ '❌' │ '✅' │ │ enableCPUSuspense │ '❌' │ '✅' │ │ enableCacheElement │ '❌' │ '✅' │ │ enableGetInspectorDataForInstanceInProduction │ '❌' │ '✅' │ │ enableLegacyHidden │ '❌' │ '✅' │ │ enableSchedulingProfiler │ '❌' │ '📊' │ │ enableUseDeferredValueInitialArg │ '❌' │ '✅' │ │ enableUseMemoCacheHook │ '❌' │ '✅' │ │ enableUseRefAccessWarning │ '❌' │ '🧪' │ │ passChildrenWhenCloningPersistedNodes │ '❌' │ '🧪' │ │ useMicrotasksForSchedulingInFabric │ '❌' │ '🧪' │ │ alwaysThrottleRetries │ '✅' │ '🧪' │ │ enableDeferRootSchedulingToMicrotask │ '✅' │ '🧪' │ │ enableUnifiedSyncLane │ '✅' │ '🧪' │ └───────────────────────────────────────────────┴────────┴───────┘ ``` ## After ``` yarn run v1.22.19 $ node ./scripts/flags/flags.js --diff rn rn-fb ┌───────────────────────────────────────────────┬────────┬───────┐ │ (index) │ RN OSS │ RN FB │ ├───────────────────────────────────────────────┼────────┼───────┤ │ alwaysThrottleRetries │ '❌' │ '🧪' │ │ disableModulePatternComponents │ '❌' │ '✅' │ │ enableCPUSuspense │ '❌' │ '✅' │ │ enableCacheElement │ '❌' │ '✅' │ │ enableDeferRootSchedulingToMicrotask │ '❌' │ '🧪' │ │ enableGetInspectorDataForInstanceInProduction │ '❌' │ '✅' │ │ enableSchedulingProfiler │ '❌' │ '📊' │ │ enableUseDeferredValueInitialArg │ '❌' │ '✅' │ │ enableUseMemoCacheHook │ '❌' │ '✅' │ │ enableUseRefAccessWarning │ '❌' │ '🧪' │ │ passChildrenWhenCloningPersistedNodes │ '❌' │ '🧪' │ │ useMicrotasksForSchedulingInFabric │ '❌' │ '🧪' │ └───────────────────────────────────────────────┴────────┴───────┘ ```