Pick feature flag to enable experimental MutationObserver (#55919) (0.83)

packages/react-native/Package.swift

@@ -347,6 +347,13 @@ let reactIntersectionObserverNativeModule = RNTarget(
   dependencies: [.reactNativeDependencies, .reactCxxReact, .reactFabric, .reactTurboModuleBridging, .reactTurboModuleCore, .reactGraphics, .reactGraphicsApple, .reactRuntimeScheduler, .yoga]
 )
 
+/// React-mutationobservernativemodule.podspec
+let reactMutationObserverNativeModule = RNTarget(
+  name: .reactMutationObserverNativeModule,
+  path: "ReactCommon/react/nativemodule/mutationobserver",
+  dependencies: [.reactNativeDependencies, .reactCxxReact, .reactFabric, .reactTurboModuleBridging, .reactTurboModuleCore, .yoga]
+)
+
 /// React-featureflagnativemodule.podspec
 let reactFeatureflagsNativemodule = RNTarget(
   name: .reactFeatureflagsNativemodule,
@@ -463,7 +470,7 @@ let reactFabric = RNTarget(
     "components/root/tests",
   ],
   dependencies: [.reactNativeDependencies, .reactJsiExecutor, .rctTypesafety, .reactTurboModuleCore, .jsi, .logger, .reactDebug, .reactFeatureFlags, .reactUtils, .reactRuntimeScheduler, .reactCxxReact, .reactRendererDebug, .reactGraphics, .yoga],
-  sources: ["animations", "attributedstring", "core", "componentregistry", "componentregistry/native", "components/root", "components/view", "components/view/platform/cxx", "components/scrollview", "components/scrollview/platform/cxx", "components/legacyviewmanagerinterop", "dom", "scheduler", "mounting", "observers/events", "observers/intersection", "telemetry", "consistency", "leakchecker", "uimanager", "uimanager/consistency"]
+  sources: ["animations", "attributedstring", "core", "componentregistry", "componentregistry/native", "components/root", "components/view", "components/view/platform/cxx", "components/scrollview", "components/scrollview/platform/cxx", "components/legacyviewmanagerinterop", "dom", "scheduler", "mounting", "observers/events", "observers/intersection", "observers/mutation", "telemetry", "consistency", "leakchecker", "uimanager", "uimanager/consistency"]
 )
 
 let reactFabricInputAccessory = RNTarget(
@@ -699,6 +706,7 @@ let targets = [
   reactIdleCallbacksNativeModule,
   reactWebPerformanceNativeModule,
   reactIntersectionObserverNativeModule,
+  reactMutationObserverNativeModule,
   reactFeatureflagsNativemodule,
   reactNativeModuleDom,
   reactAppDelegate,
@@ -887,6 +895,7 @@ extension String {
   static let reactIdleCallbacksNativeModule = "React-idlecallbacksnativemodule"
   static let reactWebPerformanceNativeModule = "React-webperformancenativemodule"
   static let reactIntersectionObserverNativeModule = "React-intersectionobservernativemodule"
+  static let reactMutationObserverNativeModule = "React-mutationobservernativemodule"
   static let reactFeatureflagsNativemodule = "React-featureflagsnativemodule"
   static let reactNativeModuleDom = "React-domnativemodule"
   static let reactAppDelegate = "React-RCTAppDelegate"

packages/react-native/ReactAndroid/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<<26dfce17f8149372c967e83a1e55b497>>
+ * @generated SignedSource<<b700a02133f84260647574d2f7a0f165>>
  */
 
 /**
@@ -246,6 +246,12 @@ public object ReactNativeFeatureFlags {
   @JvmStatic
   public fun enableModuleArgumentNSNullConversionIOS(): Boolean = accessor.enableModuleArgumentNSNullConversionIOS()
 
+  /**
+   * Enables the MutationObserver Web API in React Native.
+   */
+  @JvmStatic
+  public fun enableMutationObserverByDefault(): Boolean = accessor.enableMutationObserverByDefault()
+
   /**
    * Parse CSS strings using the Fabric CSS parser instead of ViewConfig processing
    */

packages/react-native/ReactAndroid/src/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<<7523b02820a1f77c0a851ed051770f51>>
+ * @generated SignedSource<<d9309c7f772c314b78b329e5d1ad7216>>
  */
 
 /**
@@ -56,6 +56,7 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
   private var enableLayoutAnimationsOnIOSCache: Boolean? = null
   private var enableMainQueueCoordinatorOnIOSCache: Boolean? = null
   private var enableModuleArgumentNSNullConversionIOSCache: Boolean? = null
+  private var enableMutationObserverByDefaultCache: Boolean? = null
   private var enableNativeCSSParsingCache: Boolean? = null
   private var enableNetworkEventReportingCache: Boolean? = null
   private var enablePreparedTextLayoutCache: Boolean? = null
@@ -434,6 +435,15 @@ internal class ReactNativeFeatureFlagsCxxAccessor : ReactNativeFeatureFlagsAcces
     return cached
   }
 
+  override fun enableMutationObserverByDefault(): Boolean {
+    var cached = enableMutationObserverByDefaultCache
+    if (cached == null) {
+      cached = ReactNativeFeatureFlagsCxxInterop.enableMutationObserverByDefault()
+      enableMutationObserverByDefaultCache = cached
+    }
+    return cached
+  }
+
   override fun enableNativeCSSParsing(): Boolean {
     var cached = enableNativeCSSParsingCache
     if (cached == null) {

packages/react-native/ReactAndroid/src/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<<0fa0febd40941c466222d1af82f677cf>>
+ * @generated SignedSource<<1081d2d4673967a11e8f9ac287c89f02>>
  */
 
 /**
@@ -100,6 +100,8 @@ public object ReactNativeFeatureFlagsCxxInterop {
 
   @DoNotStrip @JvmStatic public external fun enableModuleArgumentNSNullConversionIOS(): Boolean
 
+  @DoNotStrip @JvmStatic public external fun enableMutationObserverByDefault(): Boolean
+
   @DoNotStrip @JvmStatic public external fun enableNativeCSSParsing(): Boolean
 
   @DoNotStrip @JvmStatic public external fun enableNetworkEventReporting(): Boolean

packages/react-native/ReactAndroid/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<<9158a8f1750ec5e9e530399fe09f52cf>>
+ * @generated SignedSource<<bc4cd6eafbf14cd91755900db1956238>>
  */
 
 /**
@@ -95,6 +95,8 @@ public open class ReactNativeFeatureFlagsDefaults : ReactNativeFeatureFlagsProvi
 
   override fun enableModuleArgumentNSNullConversionIOS(): Boolean = false
 
+  override fun enableMutationObserverByDefault(): Boolean = false
+
   override fun enableNativeCSSParsing(): Boolean = false
 
   override fun enableNetworkEventReporting(): Boolean = true

packages/react-native/ReactAndroid/src/main/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<<9feb91e31a7d54e4b3f7737fb524800b>>
+ * @generated SignedSource<<6deac57c7f55d6d7406f7dffb1abe487>>
  */
 
 /**
@@ -60,6 +60,7 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
   private var enableLayoutAnimationsOnIOSCache: Boolean? = null
   private var enableMainQueueCoordinatorOnIOSCache: Boolean? = null
   private var enableModuleArgumentNSNullConversionIOSCache: Boolean? = null
+  private var enableMutationObserverByDefaultCache: Boolean? = null
   private var enableNativeCSSParsingCache: Boolean? = null
   private var enableNetworkEventReportingCache: Boolean? = null
   private var enablePreparedTextLayoutCache: Boolean? = null
@@ -474,6 +475,16 @@ internal class ReactNativeFeatureFlagsLocalAccessor : ReactNativeFeatureFlagsAcc
     return cached
   }
 
+  override fun enableMutationObserverByDefault(): Boolean {
+    var cached = enableMutationObserverByDefaultCache
+    if (cached == null) {
+      cached = currentProvider.enableMutationObserverByDefault()
+      accessedFeatureFlags.add("enableMutationObserverByDefault")
+      enableMutationObserverByDefaultCache = cached
+    }
+    return cached
+  }
+
   override fun enableNativeCSSParsing(): Boolean {
     var cached = enableNativeCSSParsingCache
     if (cached == null) {

packages/react-native/ReactAndroid/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<<5425bfe01cb2aaecc61b65b8c2f7dad0>>
+ * @generated SignedSource<<99e9d1149773ffdb867c2abed02b0302>>
  */
 
 /**
@@ -95,6 +95,8 @@ public interface ReactNativeFeatureFlagsProvider {
 
   @DoNotStrip public fun enableModuleArgumentNSNullConversionIOS(): Boolean
 
+  @DoNotStrip public fun enableMutationObserverByDefault(): Boolean
+
   @DoNotStrip public fun enableNativeCSSParsing(): Boolean
 
   @DoNotStrip public fun enableNetworkEventReporting(): Boolean

packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt

@@ -115,6 +115,7 @@ add_react_common_subdir(react/renderer/components/safeareaview)
 add_react_common_subdir(react/renderer/leakchecker)
 add_react_common_subdir(react/renderer/observers/events)
 add_react_common_subdir(react/renderer/observers/intersection)
+add_react_common_subdir(react/renderer/observers/mutation)
 add_react_common_subdir(react/renderer/textlayoutmanager)
 add_react_common_subdir(react/utils)
 add_react_common_subdir(react/bridging)
@@ -126,6 +127,7 @@ add_react_common_subdir(react/nativemodule/featureflags)
 add_react_common_subdir(react/nativemodule/microtasks)
 add_react_common_subdir(react/nativemodule/idlecallbacks)
 add_react_common_subdir(react/nativemodule/intersectionobserver)
+add_react_common_subdir(react/nativemodule/mutationobserver)
 add_react_common_subdir(react/nativemodule/webperformance)
 add_react_common_subdir(react/networking)
 add_react_common_subdir(jserrorhandler)
@@ -195,6 +197,7 @@ add_library(reactnative
           $<TARGET_OBJECTS:react_nativemodule_idlecallbacks>
           $<TARGET_OBJECTS:react_nativemodule_intersectionobserver>
           $<TARGET_OBJECTS:react_nativemodule_microtasks>
+          $<TARGET_OBJECTS:react_nativemodule_mutationobserver>
           $<TARGET_OBJECTS:react_nativemodule_webperformance>
           $<TARGET_OBJECTS:react_networking>
           $<TARGET_OBJECTS:react_newarchdefaults>
@@ -215,6 +218,7 @@ add_library(reactnative
           $<TARGET_OBJECTS:react_renderer_mounting>
           $<TARGET_OBJECTS:react_renderer_observers_events>
           $<TARGET_OBJECTS:react_renderer_observers_intersection>
+          $<TARGET_OBJECTS:react_renderer_observers_mutation>
           $<TARGET_OBJECTS:react_renderer_runtimescheduler>
           $<TARGET_OBJECTS:react_renderer_scheduler>
           $<TARGET_OBJECTS:react_renderer_telemetry>
@@ -288,6 +292,7 @@ target_include_directories(reactnative
         $<TARGET_PROPERTY:react_nativemodule_idlecallbacks,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_nativemodule_intersectionobserver,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_nativemodule_microtasks,INTERFACE_INCLUDE_DIRECTORIES>
+        $<TARGET_PROPERTY:react_nativemodule_mutationobserver,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_nativemodule_webperformance,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_networking,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_newarchdefaults,INTERFACE_INCLUDE_DIRECTORIES>
@@ -309,6 +314,8 @@ target_include_directories(reactnative
         $<TARGET_PROPERTY:react_renderer_mapbuffer,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_mounting,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_observers_events,INTERFACE_INCLUDE_DIRECTORIES>
+        $<TARGET_PROPERTY:react_renderer_observers_intersection,INTERFACE_INCLUDE_DIRECTORIES>
+        $<TARGET_PROPERTY:react_renderer_observers_mutation,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_runtimescheduler,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_scheduler,INTERFACE_INCLUDE_DIRECTORIES>
         $<TARGET_PROPERTY:react_renderer_telemetry,INTERFACE_INCLUDE_DIRECTORIES>

packages/react-native/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<<986de1b799ad8bc22a323365aef3533b>>
+ * @generated SignedSource<<9e684659117f413b92bcd0469fae37ba>>
  */
 
 /**
@@ -255,6 +255,12 @@ class ReactNativeFeatureFlagsJavaProvider
     return method(javaProvider_);
   }
 
+  bool enableMutationObserverByDefault() override {
+    static const auto method =
+        getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jboolean()>("enableMutationObserverByDefault");
+    return method(javaProvider_);
+  }
+
   bool enableNativeCSSParsing() override {
     static const auto method =
         getReactNativeFeatureFlagsProviderJavaClass()->getMethod<jboolean()>("enableNativeCSSParsing");
@@ -757,6 +763,11 @@ bool JReactNativeFeatureFlagsCxxInterop::enableModuleArgumentNSNullConversionIOS
   return ReactNativeFeatureFlags::enableModuleArgumentNSNullConversionIOS();
 }
 
+bool JReactNativeFeatureFlagsCxxInterop::enableMutationObserverByDefault(
+    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
+  return ReactNativeFeatureFlags::enableMutationObserverByDefault();
+}
+
 bool JReactNativeFeatureFlagsCxxInterop::enableNativeCSSParsing(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop> /*unused*/) {
   return ReactNativeFeatureFlags::enableNativeCSSParsing();
@@ -1161,6 +1172,9 @@ void JReactNativeFeatureFlagsCxxInterop::registerNatives() {
       makeNativeMethod(
         "enableModuleArgumentNSNullConversionIOS",
         JReactNativeFeatureFlagsCxxInterop::enableModuleArgumentNSNullConversionIOS),
+      makeNativeMethod(
+        "enableMutationObserverByDefault",
+        JReactNativeFeatureFlagsCxxInterop::enableMutationObserverByDefault),
       makeNativeMethod(
         "enableNativeCSSParsing",
         JReactNativeFeatureFlagsCxxInterop::enableNativeCSSParsing),

packages/react-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<<f5aa0f101192f55b7ac12705d7667424>>
+ * @generated SignedSource<<bf1f3b156e29c081684a9bada7e81a4b>>
  */
 
 /**
@@ -138,6 +138,9 @@ class JReactNativeFeatureFlagsCxxInterop
   static bool enableModuleArgumentNSNullConversionIOS(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 
+  static bool enableMutationObserverByDefault(
+    facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
+
   static bool enableNativeCSSParsing(
     facebook::jni::alias_ref<JReactNativeFeatureFlagsCxxInterop>);
 

packages/react-native/ReactCommon/React-Fabric.podspec

@@ -185,6 +185,12 @@ Pod::Spec.new do |s|
       sss.exclude_files        = "react/renderer/observers/intersection/tests"
       sss.header_dir           = "react/renderer/observers/intersection"
     end
+
+    ss.subspec "mutation" do |sss|
+      sss.source_files         = podspec_sources("react/renderer/observers/mutation/**/*.{m,mm,cpp,h}", "react/renderer/observers/mutation/**/*.h")
+      sss.exclude_files        = "react/renderer/observers/mutation/tests"
+      sss.header_dir           = "react/renderer/observers/mutation"
+    end
   end
 
   s.subspec "templateprocessor" do |ss|

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<<9ceab23bb1cb8d569411222993ef9f1e>>
+ * @generated SignedSource<<c7d08e6d97766cbb68db8772611530b5>>
  */
 
 /**
@@ -170,6 +170,10 @@ bool ReactNativeFeatureFlags::enableModuleArgumentNSNullConversionIOS() {
   return getAccessor().enableModuleArgumentNSNullConversionIOS();
 }
 
+bool ReactNativeFeatureFlags::enableMutationObserverByDefault() {
+  return getAccessor().enableMutationObserverByDefault();
+}
+
 bool ReactNativeFeatureFlags::enableNativeCSSParsing() {
   return getAccessor().enableNativeCSSParsing();
 }

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<<26b7504c2446d37c6540609a620854cb>>
+ * @generated SignedSource<<f8bd95ee62cd377756a0ca08caf3027a>>
  */
 
 /**
@@ -219,6 +219,11 @@ class ReactNativeFeatureFlags {
    */
   RN_EXPORT static bool enableModuleArgumentNSNullConversionIOS();
 
+  /**
+   * Enables the MutationObserver Web API in React Native.
+   */
+  RN_EXPORT static bool enableMutationObserverByDefault();
+
   /**
    * Parse CSS strings using the Fabric CSS parser instead of ViewConfig processing
    */