facebook · sammy-SC · May 21, 2026
diff --git a/...Android/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlags.kt b/...Android/src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlags.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<56c989556810840e2dd2a42b66d431dc>>
+ * @generated SignedSource<<6435f36d035c9e6156ca406c52c32f97>>
  */
 
 /**
@@ -552,12 +552,6 @@ public object ReactNativeFeatureFlags {
   @JvmStatic
   public fun useTurboModules(): Boolean = accessor.useTurboModules()
 
-  /**
-   * Use std::unordered_map instead of TinyMap in the Differentiator for improved lookup performance.
-   */
-  @JvmStatic
-  public fun useUnorderedMapInDifferentiator(): Boolean = accessor.useUnorderedMapInDifferentiator()
-
   /**
    * Outset the culling context frame with the provided ratio. The culling context frame size will be outset by width * ratio on the left and right, and height * ratio on the top and bottom.
    */

diff --git a/.../main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxAccessor.kt b/.../main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxAccessor.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<43aa532756b07f0b754cd74eb4811664>>
+ * @generated SignedSource<<846ef4482c364c5bdc7a53fb5cf13b7a>>
  */
 
 /**
@@ -107,7 +107,6 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
   private var useTraitHiddenOnAndroidCache: Boolean? = null
   private var useTurboModuleInteropCache: Boolean? = null
   private var useTurboModulesCache: Boolean? = null
-  private var useUnorderedMapInDifferentiatorCache: Boolean? = null
   private var viewCullingOutsetRatioCache: Double? = null
   private var viewTransitionEnabledCache: Boolean? = null
   private var viewTransitionUseHardwareBitmapAndroidCache: Boolean? = null
@@ -896,15 +895,6 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
     return cached
   }
 
-  override fun useUnorderedMapInDifferentiator(): Boolean {
-    var cached = useUnorderedMapInDifferentiatorCache
-    if (cached == null) {
-      cached = ReactNativeFeatureFlagsCxxInterop.useUnorderedMapInDifferentiator()
-      useUnorderedMapInDifferentiatorCache = cached
-    }
-    return cached
-  }
-
   override fun viewCullingOutsetRatio(): Double {
     var cached = viewCullingOutsetRatioCache
     if (cached == null) {

diff --git a/...c/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxInterop.kt b/...c/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsCxxInterop.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<5cb98793989e603846a2008aa1a6af41>>
+ * @generated SignedSource<<220fb16555e971c9044e337490a9666f>>
  */
 
 /**
@@ -202,8 +202,6 @@ public object ReactNativeFeatureFlagsCxxInterop {
 
   @DoNotStrip @JvmStatic public external fun useTurboModules(): Boolean
 
-  @DoNotStrip @JvmStatic public external fun useUnorderedMapInDifferentiator(): Boolean
-
   @DoNotStrip @JvmStatic public external fun viewCullingOutsetRatio(): Double
 
   @DoNotStrip @JvmStatic public external fun viewTransitionEnabled(): Boolean

diff --git a/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt b/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsDefaults.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<f4b6d9ed2f6ccff6ab01e53f6048423c>>
+ * @generated SignedSource<<78f2c235e31f57bc005e50215014fb36>>
  */
 
 /**
@@ -197,8 +197,6 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun useTurboModules(): Boolean = false
 
-  override fun useUnorderedMapInDifferentiator(): Boolean = false
-
   override fun viewCullingOutsetRatio(): Double = 0.0
 
   override fun viewTransitionEnabled(): Boolean = false

diff --git a/...ain/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsLocalAccessor.kt b/...ain/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsLocalAccessor.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<6ee1cc911c3ebb12b31151441dd43605>>
+ * @generated SignedSource<<6bb61ed8b333abcfd38da1c2ef19f421>>
  */
 
 /**
@@ -111,7 +111,6 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
   private var useTraitHiddenOnAndroidCache: Boolean? = null
   private var useTurboModuleInteropCache: Boolean? = null
   private var useTurboModulesCache: Boolean? = null
-  private var useUnorderedMapInDifferentiatorCache: Boolean? = null
   private var viewCullingOutsetRatioCache: Double? = null
   private var viewTransitionEnabledCache: Boolean? = null
   private var viewTransitionUseHardwareBitmapAndroidCache: Boolean? = null
@@ -987,16 +986,6 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
     return cached
   }
 
-  override fun useUnorderedMapInDifferentiator(): Boolean {
-    var cached = useUnorderedMapInDifferentiatorCache
-    if (cached == null) {
-      cached = currentProvider.useUnorderedMapInDifferentiator()
-      accessedFeatureFlags.add("useUnorderedMapInDifferentiator")
-      useUnorderedMapInDifferentiatorCache = cached
-    }
-    return cached
-  }
-
   override fun viewCullingOutsetRatio(): Double {
     var cached = viewCullingOutsetRatioCache
     if (cached == null) {

diff --git a/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsProvider.kt b/...src/main/java/com/facebook/react/internal/featureflags/ReactNativeFeatureFlagsProvider.kt
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<9945400608426bf3aa1163b9f212d07c>>
+ * @generated SignedSource<<af3130efca40b595fbb0aa0a15770a05>>
  */
 
 /**
@@ -197,8 +197,6 @@ public interface ReactNativeFeatureFlagsProvider {
 
   @DoNotStrip public fun useTurboModules(): Boolean
 
-  @DoNotStrip public fun useUnorderedMapInDifferentiator(): Boolean
-
   @DoNotStrip public fun viewCullingOutsetRatio(): Double
 
   @DoNotStrip public fun viewTransitionEnabled(): Boolean

diff --git a/...ative/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.cpp b/...ative/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.cpp
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<50f384f98360c4fc9d16d7c25b82aec6>>
+ * @generated SignedSource<<3194d64185f009102ffc2f218451b912>>
  */
 
 /**
@@ -561,12 +561,6 @@ class ReactNativeFeatureFlagsJavaProvider
     return method(javaProvider_);
   }
 
-  bool useUnorderedMapInDifferentiator() override {
-    static const auto method =
-        getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jboolean()>("useUnorderedMapInDifferentiator");
-    return method(javaProvider_);
-  }
-
   double viewCullingOutsetRatio() override {
     static const auto method =
         getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jdouble()>("viewCullingOutsetRatio");
@@ -1030,11 +1024,6 @@ bool JReactNativeFeatureFlagsCxxInterop::useTurboModules(
   return ReactNativeFeatureFlags::useTurboModules();
 }
 
-bool JReactNativeFeatureFlagsCxxInterop::useUnorderedMapInDifferentiator(
-    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
-  return ReactNativeFeatureFlags::useUnorderedMapInDifferentiator();
-}
-
 double JReactNativeFeatureFlagsCxxInterop::viewCullingOutsetRatio(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
   return ReactNativeFeatureFlags::viewCullingOutsetRatio();
@@ -1347,9 +1336,6 @@ void JReactNativeFeatureFlagsCxxInterop::registerNatives() {
       makeNativeMethod(
         "useTurboModules",
         JReactNativeFeatureFlagsCxxInterop::useTurboModules),
-      makeNativeMethod(
-        "useUnorderedMapInDifferentiator",
-        JReactNativeFeatureFlagsCxxInterop::useUnorderedMapInDifferentiator),
       makeNativeMethod(
         "viewCullingOutsetRatio",
         JReactNativeFeatureFlagsCxxInterop::viewCullingOutsetRatio),

diff --git a/...-native/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.h b/...-native/ReactAndroid/src/main/jni/react/featureflags/JReactNativeFeatureFlagsCxxInterop.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<7a73667c552251d722f6c9800f53d251>>
+ * @generated SignedSource<<434594f8c9022e0fb028be591ac4147c>>
  */
 
 /**
@@ -291,9 +291,6 @@ class JReactNativeFeatureFlagsCxxInterop
   static bool useTurboModules(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 
-  static bool useUnorderedMapInDifferentiator(
-    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
-
   static double viewCullingOutsetRatio(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.cpp b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.cpp
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<8233ac72d584e038a6c1d94bea37ea40>>
+ * @generated SignedSource<<6cf8cc4c41d2747fb2dabaddff723d88>>
  */
 
 /**
@@ -374,10 +374,6 @@ bool ReactNativeFeatureFlags::useTurboModules() {
   return getAccessor().useTurboModules();
 }
 
-bool ReactNativeFeatureFlags::useUnorderedMapInDifferentiator() {
-  return getAccessor().useUnorderedMapInDifferentiator();
-}
-
 double ReactNativeFeatureFlags::viewCullingOutsetRatio() {
   return getAccessor().viewCullingOutsetRatio();
 }

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.h b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlags.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<501a0efcf0a4ab20827bdefc3a844b3f>>
+ * @generated SignedSource<<71219a9ff75aaaf54d0041722d8f44a2>>
  */
 
 /**
@@ -474,11 +474,6 @@ class ReactNativeFeatureFlags {
    */
   RN_EXPORT static bool useTurboModules();
 
-  /**
-   * Use std::unordered_map instead of TinyMap in the Differentiator for improved lookup performance.
-   */
-  RN_EXPORT static bool useUnorderedMapInDifferentiator();
-
   /**
    * Outset the culling context frame with the provided ratio. The culling context frame size will be outset by width * ratio on the left and right, and height * ratio on the top and bottom.
    */

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsAccessor.cpp b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsAccessor.cpp
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<38e1f5a2dbb854a154e96c20e701b2e4>>
+ * @generated SignedSource<<ec8de0e7fd0a799af284ee3663e88ab4>>
  */
 
 /**
@@ -1595,24 +1595,6 @@ bool ReactNativeFeatureFlagsAccessor::useTurboModules() {
   return flagValue.value();
 }
 
-bool ReactNativeFeatureFlagsAccessor::useUnorderedMapInDifferentiator() {
-  auto flagValue = useUnorderedMapInDifferentiator_.load();
-
-  if (!flagValue.has_value()) {
-    // This block is not exclusive but it is not necessary.
-    // If multiple threads try to initialize the feature flag, we would only
-    // be accessing the provider multiple times but the end state of this
-    // instance and the returned flag value would be the same.
-
-    markFlagAsAccessed(87, "useUnorderedMapInDifferentiator");
-
-    flagValue = currentProvider_->useUnorderedMapInDifferentiator();
-    useUnorderedMapInDifferentiator_ = flagValue;
-  }
-
-  return flagValue.value();
-}
-
 double ReactNativeFeatureFlagsAccessor::viewCullingOutsetRatio() {
   auto flagValue = viewCullingOutsetRatio_.load();
 
@@ -1622,7 +1604,7 @@ double ReactNativeFeatureFlagsAccessor::viewCullingOutsetRatio() {
     // be accessing the provider multiple times but the end state of this
     // instance and the returned flag value would be the same.
 
-    markFlagAsAccessed(88, "viewCullingOutsetRatio");
+    markFlagAsAccessed(87, "viewCullingOutsetRatio");
 
     flagValue = currentProvider_->viewCullingOutsetRatio();
     viewCullingOutsetRatio_ = flagValue;
@@ -1640,7 +1622,7 @@ bool ReactNativeFeatureFlagsAccessor::viewTransitionEnabled() {
     // be accessing the provider multiple times but the end state of this
     // instance and the returned flag value would be the same.
 
-    markFlagAsAccessed(89, "viewTransitionEnabled");
+    markFlagAsAccessed(88, "viewTransitionEnabled");
 
     flagValue = currentProvider_->viewTransitionEnabled();
     viewTransitionEnabled_ = flagValue;
@@ -1658,7 +1640,7 @@ bool ReactNativeFeatureFlagsAccessor::viewTransitionUseHardwareBitmapAndroid() {
     // be accessing the provider multiple times but the end state of this
     // instance and the returned flag value would be the same.
 
-    markFlagAsAccessed(90, "viewTransitionUseHardwareBitmapAndroid");
+    markFlagAsAccessed(89, "viewTransitionUseHardwareBitmapAndroid");
 
     flagValue = currentProvider_->viewTransitionUseHardwareBitmapAndroid();
     viewTransitionUseHardwareBitmapAndroid_ = flagValue;
@@ -1676,7 +1658,7 @@ double ReactNativeFeatureFlagsAccessor::virtualViewPrerenderRatio() {
     // be accessing the provider multiple times but the end state of this
     // instance and the returned flag value would be the same.
 
-    markFlagAsAccessed(91, "virtualViewPrerenderRatio");
+    markFlagAsAccessed(90, "virtualViewPrerenderRatio");
 
     flagValue = currentProvider_->virtualViewPrerenderRatio();
     virtualViewPrerenderRatio_ = flagValue;

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsAccessor.h b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsAccessor.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<7ca64bcbf3e769a24efe894e994b131e>>
+ * @generated SignedSource<<bca7e4b933de3dfd86399156dbc195ab>>
  */
 
 /**
@@ -119,7 +119,6 @@ class ReactNativeFeatureFlagsAccessor {
   bool useTraitHiddenOnAndroid();
   bool useTurboModuleInterop();
   bool useTurboModules();
-  bool useUnorderedMapInDifferentiator();
   double viewCullingOutsetRatio();
   bool viewTransitionEnabled();
   bool viewTransitionUseHardwareBitmapAndroid();
@@ -135,7 +134,7 @@ class ReactNativeFeatureFlagsAccessor {
   std::unique_ptr<ReactNativeFeatureFlagsProvider> currentProvider_;
   bool wasOverridden_;
 
-  std::array<std::atomic<const char*>, 92> accessedFeatureFlags_;
+  std::array<std::atomic<const char*>, 91> accessedFeatureFlags_;
 
   std::atomic<std::optional<bool>> commonTestFlag_;
   std::atomic<std::optional<bool>> cdpInteractionMetricsEnabled_;
@@ -224,7 +223,6 @@ class ReactNativeFeatureFlagsAccessor {
   std::atomic<std::optional<bool>> useTraitHiddenOnAndroid_;
   std::atomic<std::optional<bool>> useTurboModuleInterop_;
   std::atomic<std::optional<bool>> useTurboModules_;
-  std::atomic<std::optional<bool>> useUnorderedMapInDifferentiator_;
   std::atomic<std::optional<double>> viewCullingOutsetRatio_;
   std::atomic<std::optional<bool>> viewTransitionEnabled_;
   std::atomic<std::optional<bool>> viewTransitionUseHardwareBitmapAndroid_;

diff --git a/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h b/packages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<df8c0c8c4ec5942b5855b53beb497c1f>>
+ * @generated SignedSource<<c5931b97542549adb6bf9dbb733368cc>>
  */
 
 /**
@@ -375,10 +375,6 @@ class ReactNativeFeatureFlagsDefaults : public ReactNativeFeatureFlagsProvider {
     return false;
   }
 
-  bool useUnorderedMapInDifferentiator() override {
-    return false;
-  }
-
   double viewCullingOutsetRatio() override {
     return 0.0;
   }

diff --git a/...ages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDynamicProvider.h b/...ages/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDynamicProvider.h
@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<ec98fe64276aaaa226710fad24b27415>>
+ * @generated SignedSource<<eea7d8b25190b3e85622eb65d7705072>>
  */
 
 /**
@@ -828,15 +828,6 @@ class ReactNativeFeatureFlagsDynamicProvider : public ReactNativeFeatureFlagsDef
     return ReactNativeFeatureFlagsDefaults::useTurboModules();
   }
 
-  bool useUnorderedMapInDifferentiator() override {
-    auto value = values_["useUnorderedMapInDifferentiator"];
-    if (!value.isNull()) {
-      return value.getBool();
-    }
-
-    return ReactNativeFeatureFlagsDefaults::useUnorderedMapInDifferentiator();
-  }
-
   double viewCullingOutsetRatio() override {
     auto value = values_["viewCullingOutsetRatio"];
     if (!value.isNull()) {