Make enableOwnerStacks dynamic

packages/react/index.fb.js

@@ -7,6 +7,8 @@
  * @flow
  */
 
+import {enableOwnerStacks} from 'shared/ReactFeatureFlags';
+import {captureOwnerStack as captureOwnerStackImpl} from './src/ReactClient';
 export {
   __CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   __COMPILER_RUNTIME,
@@ -67,3 +69,11 @@ export {useMemoCache as unstable_useMemoCache} from './src/ReactHooks';
 // export to match the name of the OSS function typically exported from
 // react/compiler-runtime
 export {useMemoCache as c} from './src/ReactHooks';
+
+// Only export captureOwnerStack if the flag is on, to support feature detection.
+let captureOwnerStack;
+if (enableOwnerStacks) {
+  captureOwnerStack = captureOwnerStackImpl;
+}
+
+export {captureOwnerStack};

packages/react/src/ReactServer.fb.js

@@ -10,6 +10,7 @@
 export {default as __SERVER_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE} from './ReactSharedInternalsServer';
 
 import {forEach, map, count, toArray, only} from './ReactChildren';
+import {captureOwnerStack} from './ReactOwnerStack';
 import {
   REACT_FRAGMENT_TYPE,
   REACT_PROFILER_TYPE,
@@ -57,4 +58,5 @@ export {
   useDebugValue,
   useMemo,
   version,
+  captureOwnerStack, // DEV-only
 };

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 enableSiblingPrerendering = __VARIANT__;
+export const enableOwnerStacks = __VARIANT__;

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

@@ -27,6 +27,7 @@ export const {
   enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes,
   enableSiblingPrerendering,
+  enableOwnerStacks,
 } = dynamicFlags;
 
 // The rest of the flags are static for better dead code elimination.
@@ -67,7 +68,6 @@ export const enableLegacyFBSupport = false;
 export const enableLegacyHidden = false;
 export const enableLogStringRefsProd: null | ((string, string) => void) = null;
 export const enableNoCloningMemoCache = false;
-export const enableOwnerStacks = false;
 export const enablePostpone = false;
 export const enableProfilerCommitHooks = __PROFILE__;
 export const enableProfilerNestedUpdatePhase = __PROFILE__;

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

@@ -30,6 +30,7 @@ export const enableRetryLaneExpiration = __VARIANT__;
 export const enableTransitionTracing = __VARIANT__;
 export const favorSafetyOverHydrationPerf = __VARIANT__;
 export const renameElementSymbol = __VARIANT__;
+export const enableOwnerStacks = __VARIANT__;
 export const retryLaneExpirationMs = 5000;
 export const syncLaneExpirationMs = 250;
 export const transitionLaneExpirationMs = 5000;

packages/shared/forks/ReactFeatureFlags.www.js

@@ -38,6 +38,7 @@ export const {
   retryLaneExpirationMs,
   syncLaneExpirationMs,
   transitionLaneExpirationMs,
+  enableOwnerStacks,
 } = dynamicFeatureFlags;
 
 // On WWW, __EXPERIMENTAL__ is used for a new modern build.
@@ -124,7 +125,6 @@ export const useModernStrictMode = true;
 export const disableLegacyMode: boolean =
   __EXPERIMENTAL__ || dynamicFeatureFlags.disableLegacyMode;
 
-export const enableOwnerStacks = false;
 export const enableShallowPropDiffing = false;
 
 // Flow magic to verify the exports of this file match the original version.