Feature flag: enableSiblingPrerendering (#30761)

Adds a new feature flag for an upcoming experiment.

No implementation yet.

packages/shared/ReactFeatureFlags.js

@@ -148,6 +148,8 @@ export const enableOwnerStacks = __EXPERIMENTAL__;
 
 export const enableShallowPropDiffing = false;
 
+export const enableSiblingPrerendering = __EXPERIMENTAL__;
+
 /**
  * Enables an expiration time for retry lanes to avoid starvation.
  */

packages/shared/forks/ReactFeatureFlags.native-fb-dynamic.js

@@ -25,3 +25,4 @@ export const enableShallowPropDiffing = __VARIANT__;
 export const passChildrenWhenCloningPersistedNodes = __VARIANT__;
 export const enableFabricCompleteRootInCommitPhase = __VARIANT__;
 export const enableLazyContextPropagation = __VARIANT__;
+export const enableSiblingPrerendering = __VARIANT__;

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -27,6 +27,7 @@ export const {
   enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes,
   enableLazyContextPropagation,
+  enableSiblingPrerendering,
 } = dynamicFlags;
 
 // The rest of the flags are static for better dead code elimination.

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -84,6 +84,7 @@ export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
+export const enableSiblingPrerendering = false;
 
 // Profiling Only
 export const enableProfilerTimer = __PROFILE__;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -80,6 +80,7 @@ export const enableAddPropertiesFastPath = false;
 
 export const renameElementSymbol = true;
 export const enableShallowPropDiffing = false;
+export const enableSiblingPrerendering = __EXPERIMENTAL__;
 
 // TODO: This must be in sync with the main ReactFeatureFlags file because
 // the Test Renderer's value must be the same as the one used by the

packages/shared/forks/ReactFeatureFlags.test-renderer.native-fb.js

@@ -80,6 +80,7 @@ export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;
 export const useModernStrictMode = true;
 export const enableFabricCompleteRootInCommitPhase = false;
+export const enableSiblingPrerendering = false;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -94,6 +94,7 @@ export const renameElementSymbol = false;
 export const enableObjectFiber = false;
 export const enableOwnerStacks = false;
 export const enableShallowPropDiffing = false;
+export const enableSiblingPrerendering = false;
 
 // Flow magic to verify the exports of this file match the original version.
 ((((null: any): ExportsType): FeatureFlagsType): ExportsType);

packages/shared/forks/ReactFeatureFlags.www-dynamic.js

@@ -41,6 +41,7 @@ export const enableDebugTracing = __EXPERIMENTAL__;
 export const enableSchedulingProfiler = __VARIANT__;
 
 export const enableInfiniteRenderLoopDetection = __VARIANT__;
+export const enableSiblingPrerendering = __VARIANT__;
 
 // TODO: These flags are hard-coded to the default values used in open source.
 // Update the tests so that they pass in either mode, then set these

packages/shared/forks/ReactFeatureFlags.www.js

@@ -35,6 +35,7 @@ export const {
   retryLaneExpirationMs,
   syncLaneExpirationMs,
   transitionLaneExpirationMs,
+  enableSiblingPrerendering,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.