Experiment with using an object literal for Fiber creation (#28734)

Object literals should be faster at least on React Native with Hermes as
the JS engine.
It might also be interesting to confirm the old comments in this file
from years ago are even still valid. Creating an object from a literal
should be a simpler operation.

It's a bit unfortunate that this introduces a bunch of copied code, but
since we rearely update the fields on fibers, this seems like an okay
tradeoff for a hot code path. An alternative would be some sort of macro
system, but that doesn't seem worth the extra complexity.

DiffTrain build for commit https://github.com/facebook/react/commit/fe9828954adcc51aa2bd21fe53d969a44dd3c9d2.

compiled-rn/VERSION_NATIVE_FB

@@ -1 +1 @@
-19.0.0-native-fb-9647333b3d-20240710
+19.0.0-native-fb-fe9828954a-20240710

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react-test-renderer/cjs/ReactTestRenderer-dev.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<01dd4b5a3d9624de154a5d6e011f8782>>
+ * @generated SignedSource<<9cef70fc774ae45a7e3850789b3cb38f>>
  */
 
 "use strict";
@@ -75,6 +75,9 @@ __DEV__ &&
     function shouldErrorImpl() {
       return null;
     }
+    function createFiber(tag, pendingProps, key, mode) {
+      return new FiberNode(tag, pendingProps, key, mode);
+    }
     function findHostInstancesForRefresh(root, families) {
       var hostInstances = new Set();
       families = new Set(
@@ -12478,9 +12481,6 @@ __DEV__ &&
         "function" !== typeof Object.preventExtensions ||
         Object.preventExtensions(this);
     }
-    function createFiber(tag, pendingProps, key, mode) {
-      return new FiberNode(tag, pendingProps, key, mode);
-    }
     function shouldConstruct(Component) {
       Component = Component.prototype;
       return !(!Component || !Component.isReactComponent);
@@ -15159,14 +15159,14 @@ __DEV__ &&
         scheduleRoot: scheduleRoot,
         setRefreshHandler: setRefreshHandler,
         getCurrentFiber: getCurrentFiberForDevTools,
-        reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+        reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
       });
     })({
       findFiberByHostInstance: function () {
         throw Error("TestRenderer does not support findFiberByHostInstance()");
       },
       bundleType: 1,
-      version: "19.0.0-native-fb-9647333b3d-20240710",
+      version: "19.0.0-native-fb-fe9828954a-20240710",
       rendererPackageName: "react-test-renderer"
     });
     exports._Scheduler = Scheduler;

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react-test-renderer/cjs/ReactTestRenderer-prod.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<a96bd6dd77a404eb989749a834a548c7>>
+ * @generated SignedSource<<40cb55a2c17e388258d1238f01fa536e>>
  */
 
 "use strict";
@@ -2227,7 +2227,7 @@ function createChildReconciler(shouldTrackSideEffects) {
           "function" === typeof x.then)
       )
         throw x;
-      var fiber = createFiber(29, x, null, returnFiber.mode);
+      var fiber = createFiberImplClass(29, x, null, returnFiber.mode);
       fiber.lanes = lanes;
       fiber.return = returnFiber;
       return fiber;
@@ -8713,7 +8713,7 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.childLanes = this.lanes = 0;
   this.alternate = null;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
 function shouldConstruct(Component) {
@@ -8723,7 +8723,7 @@ function shouldConstruct(Component) {
 function createWorkInProgress(current, pendingProps) {
   var workInProgress = current.alternate;
   null === workInProgress
-    ? ((workInProgress = createFiber(
+    ? ((workInProgress = createFiberImplClass(
         current.tag,
         pendingProps,
         current.key,
@@ -8812,21 +8812,21 @@ function createFiberFromTypeAndProps(
         break;
       case REACT_PROFILER_TYPE:
         return (
-          (type = createFiber(12, pendingProps, key, mode | 2)),
+          (type = createFiberImplClass(12, pendingProps, key, mode | 2)),
           (type.elementType = REACT_PROFILER_TYPE),
           (type.lanes = lanes),
           type
         );
       case REACT_SUSPENSE_TYPE:
         return (
-          (type = createFiber(13, pendingProps, key, mode)),
+          (type = createFiberImplClass(13, pendingProps, key, mode)),
           (type.elementType = REACT_SUSPENSE_TYPE),
           (type.lanes = lanes),
           type
         );
       case REACT_SUSPENSE_LIST_TYPE:
         return (
-          (type = createFiber(19, pendingProps, key, mode)),
+          (type = createFiberImplClass(19, pendingProps, key, mode)),
           (type.elementType = REACT_SUSPENSE_LIST_TYPE),
           (type.lanes = lanes),
           type
@@ -8861,19 +8861,19 @@ function createFiberFromTypeAndProps(
         );
         owner = null;
     }
-  key = createFiber(fiberTag, pendingProps, key, mode);
+  key = createFiberImplClass(fiberTag, pendingProps, key, mode);
   key.elementType = type;
   key.type = owner;
   key.lanes = lanes;
   return key;
 }
 function createFiberFromFragment(elements, mode, lanes, key) {
-  elements = createFiber(7, elements, key, mode);
+  elements = createFiberImplClass(7, elements, key, mode);
   elements.lanes = lanes;
   return elements;
 }
 function createFiberFromOffscreen(pendingProps, mode, lanes, key) {
-  pendingProps = createFiber(22, pendingProps, key, mode);
+  pendingProps = createFiberImplClass(22, pendingProps, key, mode);
   pendingProps.elementType = REACT_OFFSCREEN_TYPE;
   pendingProps.lanes = lanes;
   var primaryChildInstance = {
@@ -8914,12 +8914,12 @@ function createFiberFromOffscreen(pendingProps, mode, lanes, key) {
   return pendingProps;
 }
 function createFiberFromText(content, mode, lanes) {
-  content = createFiber(6, content, null, mode);
+  content = createFiberImplClass(6, content, null, mode);
   content.lanes = lanes;
   return content;
 }
 function createFiberFromPortal(portal, mode, lanes) {
-  mode = createFiber(
+  mode = createFiberImplClass(
     4,
     null !== portal.children ? portal.children : [],
     portal.key,
@@ -9005,7 +9005,7 @@ function createContainer(
       !0 === isStrictMode && (tag |= 24),
       concurrentUpdatesByDefaultOverride && (tag |= 32))
     : (tag = 0);
-  isStrictMode = createFiber(3, null, null, tag);
+  isStrictMode = createFiberImplClass(3, null, null, tag);
   containerInfo.current = isStrictMode;
   isStrictMode.stateNode = containerInfo;
   concurrentUpdatesByDefaultOverride = createCache();
@@ -9384,7 +9384,7 @@ var devToolsConfig$jscomp$inline_1053 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "19.0.0-native-fb-9647333b3d-20240710",
+  version: "19.0.0-native-fb-fe9828954a-20240710",
   rendererPackageName: "react-test-renderer"
 };
 var internals$jscomp$inline_1240 = {
@@ -9415,7 +9415,7 @@ var internals$jscomp$inline_1240 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1241 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react-test-renderer/cjs/ReactTestRenderer-profiling.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<3764d14ed445c5c8724d00d7fbd96c6f>>
+ * @generated SignedSource<<e98e00def07c1371021bb79653377e82>>
  */
 
 "use strict";
@@ -2315,7 +2315,7 @@ function createChildReconciler(shouldTrackSideEffects) {
           "function" === typeof x.then)
       )
         throw x;
-      var fiber = createFiber(29, x, null, returnFiber.mode);
+      var fiber = createFiberImplClass(29, x, null, returnFiber.mode);
       fiber.lanes = lanes;
       fiber.return = returnFiber;
       return fiber;
@@ -9319,7 +9319,7 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.actualStartTime = -1;
   this.treeBaseDuration = this.selfBaseDuration = 0;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
 function shouldConstruct(Component) {
@@ -9329,7 +9329,7 @@ function shouldConstruct(Component) {
 function createWorkInProgress(current, pendingProps) {
   var workInProgress = current.alternate;
   null === workInProgress
-    ? ((workInProgress = createFiber(
+    ? ((workInProgress = createFiberImplClass(
         current.tag,
         pendingProps,
         current.key,
@@ -9426,7 +9426,7 @@ function createFiberFromTypeAndProps(
         break;
       case REACT_PROFILER_TYPE:
         return (
-          (type = createFiber(12, pendingProps, key, mode | 2)),
+          (type = createFiberImplClass(12, pendingProps, key, mode | 2)),
           (type.elementType = REACT_PROFILER_TYPE),
           (type.lanes = lanes),
           (type.stateNode = { effectDuration: 0, passiveEffectDuration: 0 }),
@@ -9434,14 +9434,14 @@ function createFiberFromTypeAndProps(
         );
       case REACT_SUSPENSE_TYPE:
         return (
-          (type = createFiber(13, pendingProps, key, mode)),
+          (type = createFiberImplClass(13, pendingProps, key, mode)),
           (type.elementType = REACT_SUSPENSE_TYPE),
           (type.lanes = lanes),
           type
         );
       case REACT_SUSPENSE_LIST_TYPE:
         return (
-          (type = createFiber(19, pendingProps, key, mode)),
+          (type = createFiberImplClass(19, pendingProps, key, mode)),
           (type.elementType = REACT_SUSPENSE_LIST_TYPE),
           (type.lanes = lanes),
           type
@@ -9476,19 +9476,19 @@ function createFiberFromTypeAndProps(
         );
         owner = null;
     }
-  key = createFiber(fiberTag, pendingProps, key, mode);
+  key = createFiberImplClass(fiberTag, pendingProps, key, mode);
   key.elementType = type;
   key.type = owner;
   key.lanes = lanes;
   return key;
 }
 function createFiberFromFragment(elements, mode, lanes, key) {
-  elements = createFiber(7, elements, key, mode);
+  elements = createFiberImplClass(7, elements, key, mode);
   elements.lanes = lanes;
   return elements;
 }
 function createFiberFromOffscreen(pendingProps, mode, lanes, key) {
-  pendingProps = createFiber(22, pendingProps, key, mode);
+  pendingProps = createFiberImplClass(22, pendingProps, key, mode);
   pendingProps.elementType = REACT_OFFSCREEN_TYPE;
   pendingProps.lanes = lanes;
   var primaryChildInstance = {
@@ -9529,12 +9529,12 @@ function createFiberFromOffscreen(pendingProps, mode, lanes, key) {
   return pendingProps;
 }
 function createFiberFromText(content, mode, lanes) {
-  content = createFiber(6, content, null, mode);
+  content = createFiberImplClass(6, content, null, mode);
   content.lanes = lanes;
   return content;
 }
 function createFiberFromPortal(portal, mode, lanes) {
-  mode = createFiber(
+  mode = createFiberImplClass(
     4,
     null !== portal.children ? portal.children : [],
     portal.key,
@@ -9622,7 +9622,7 @@ function createContainer(
       concurrentUpdatesByDefaultOverride && (tag |= 32))
     : (tag = 0);
   isDevToolsPresent && (tag |= 2);
-  isStrictMode = createFiber(3, null, null, tag);
+  isStrictMode = createFiberImplClass(3, null, null, tag);
   containerInfo.current = isStrictMode;
   isStrictMode.stateNode = containerInfo;
   concurrentUpdatesByDefaultOverride = createCache();
@@ -10004,7 +10004,7 @@ var devToolsConfig$jscomp$inline_1136 = {
     throw Error("TestRenderer does not support findFiberByHostInstance()");
   },
   bundleType: 0,
-  version: "19.0.0-native-fb-9647333b3d-20240710",
+  version: "19.0.0-native-fb-fe9828954a-20240710",
   rendererPackageName: "react-test-renderer"
 };
 (function (internals) {
@@ -10048,7 +10048,7 @@ var devToolsConfig$jscomp$inline_1136 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 });
 exports._Scheduler = Scheduler;
 exports.act = act;

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react/cjs/React-dev.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<562bf71e601a5e5aa5c534b3ed30d7aa>>
+ * @generated SignedSource<<e982d75c61c17cbc3d14cab1c9ad15e8>>
  */
 
 "use strict";
@@ -1748,7 +1748,7 @@ __DEV__ &&
     exports.useTransition = function () {
       return resolveDispatcher().useTransition();
     };
-    exports.version = "19.0.0-native-fb-9647333b3d-20240710";
+    exports.version = "19.0.0-native-fb-fe9828954a-20240710";
     "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
       "function" ===
         typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react/cjs/React-prod.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<95205025217ebe36ed27eda6b2488601>>
+ * @generated SignedSource<<2f82adcf7d438c0b2588e872ad5b60a8>>
  */
 
 "use strict";
@@ -604,4 +604,4 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.0.0-native-fb-9647333b3d-20240710";
+exports.version = "19.0.0-native-fb-fe9828954a-20240710";

compiled-rn/facebook-fbsource/xplat/js/RKJSModules/vendor/react/react/cjs/React-profiling.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<7e542d278da0a700309e6fc450e5a369>>
+ * @generated SignedSource<<fcd04ff4f2d392cbe8aa60a3f5262fce>>
  */
 
 "use strict";
@@ -608,7 +608,7 @@ exports.useSyncExternalStore = function (
 exports.useTransition = function () {
   return ReactSharedInternals.H.useTransition();
 };
-exports.version = "19.0.0-native-fb-9647333b3d-20240710";
+exports.version = "19.0.0-native-fb-fe9828954a-20240710";
 "undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ &&
   "function" ===
     typeof __REACT_DEVTOOLS_GLOBAL_HOOK__.registerInternalModuleStop &&

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/REVISION

@@ -1 +1 @@
-9647333b3d5a5d2a3ca7fe2a78d2d3da24bc4984
+fe9828954adcc51aa2bd21fe53d969a44dd3c9d2

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactFabric-dev.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<93b736b3c74c0f2fab84b1a60c436181>>
+ * @generated SignedSource<<8bbbf707b5c0fdbafff9a599d611e079>>
  */
 
 "use strict";
@@ -13470,9 +13470,48 @@ __DEV__ &&
         "function" !== typeof Object.preventExtensions ||
         Object.preventExtensions(this);
     }
-    function createFiber(tag, pendingProps, key, mode) {
+    function createFiberImplClass(tag, pendingProps, key, mode) {
       return new FiberNode(tag, pendingProps, key, mode);
     }
+    function createFiberImplObject(tag, pendingProps, key, mode) {
+      tag = {
+        elementType: null,
+        type: null,
+        stateNode: null,
+        return: null,
+        child: null,
+        sibling: null,
+        index: 0,
+        ref: null,
+        refCleanup: null,
+        memoizedProps: null,
+        updateQueue: null,
+        memoizedState: null,
+        dependencies: null,
+        flags: 0,
+        subtreeFlags: 0,
+        deletions: null,
+        lanes: 0,
+        childLanes: 0,
+        alternate: null,
+        tag: tag,
+        key: key,
+        pendingProps: pendingProps,
+        mode: mode,
+        actualDuration: 0,
+        actualStartTime: -1,
+        selfBaseDuration: 0,
+        treeBaseDuration: 0,
+        _debugInfo: null,
+        _debugOwner: null,
+        _debugNeedsRemount: !1,
+        _debugHookTypes: null
+      };
+      hasBadMapPolyfill ||
+        "function" !== typeof Object.preventExtensions ||
+        Object.preventExtensions(tag);
+      return tag;
+    }
     function shouldConstruct(Component) {
       Component = Component.prototype;
       return !(!Component || !Component.isReactComponent);
@@ -14210,6 +14249,7 @@ __DEV__ &&
         dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
       enableAddPropertiesFastPath =
         dynamicFlagsUntyped.enableAddPropertiesFastPath,
+      enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
       enableShallowPropDiffing = dynamicFlagsUntyped.enableShallowPropDiffing,
       passChildrenWhenCloningPersistedNodes =
         dynamicFlagsUntyped.passChildrenWhenCloningPersistedNodes,
@@ -16644,6 +16684,9 @@ __DEV__ &&
     } catch (e) {
       hasBadMapPolyfill = !0;
     }
+    var createFiber = enableObjectFiber
+      ? createFiberImplObject
+      : createFiberImplClass;
     var didWarnAboutNestedUpdates = !1;
     var didWarnAboutFindNodeInStrictMode = {};
     var overrideHookState = null,
@@ -16766,12 +16809,12 @@ __DEV__ &&
         scheduleRoot: scheduleRoot,
         setRefreshHandler: setRefreshHandler,
         getCurrentFiber: getCurrentFiberForDevTools,
-        reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+        reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
       });
     })({
       findFiberByHostInstance: getInstanceFromNode,
       bundleType: 1,
-      version: "19.0.0-native-fb-9647333b3d-20240710",
+      version: "19.0.0-native-fb-fe9828954a-20240710",
       rendererPackageName: "react-native-renderer",
       rendererConfig: {
         getInspectorDataForInstance: getInspectorDataForInstance,

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactFabric-prod.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<8c3e605bcd4deab6887546241ce915f2>>
+ * @generated SignedSource<<c77fee587e5dac8c50f6592780bb8ef0>>
  */
 
 "use strict";
@@ -23,6 +23,7 @@ var ReactNativePrivateInterface = require("react-native/Libraries/ReactPrivate/R
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
   enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
+  enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
   enableShallowPropDiffing = dynamicFlagsUntyped.enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes =
     dynamicFlagsUntyped.passChildrenWhenCloningPersistedNodes,
@@ -10082,9 +10083,39 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.childLanes = this.lanes = 0;
   this.alternate = null;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
+function createFiberImplObject(tag, pendingProps, key, mode) {
+  return {
+    elementType: null,
+    type: null,
+    stateNode: null,
+    return: null,
+    child: null,
+    sibling: null,
+    index: 0,
+    ref: null,
+    refCleanup: null,
+    memoizedProps: null,
+    updateQueue: null,
+    memoizedState: null,
+    dependencies: null,
+    flags: 0,
+    subtreeFlags: 0,
+    deletions: null,
+    lanes: 0,
+    childLanes: 0,
+    alternate: null,
+    tag: tag,
+    key: key,
+    pendingProps: pendingProps,
+    mode: mode
+  };
+}
+var createFiber = enableObjectFiber
+  ? createFiberImplObject
+  : createFiberImplClass;
 function shouldConstruct(Component) {
   Component = Component.prototype;
   return !(!Component || !Component.isReactComponent);
@@ -10601,7 +10632,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1136 = {
     findFiberByHostInstance: getInstanceFromNode,
     bundleType: 0,
-    version: "19.0.0-native-fb-9647333b3d-20240710",
+    version: "19.0.0-native-fb-fe9828954a-20240710",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -10644,7 +10675,7 @@ var internals$jscomp$inline_1362 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1363 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactFabric-profiling.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<eded79e65bbb1c9ba4327a288770e3ad>>
+ * @generated SignedSource<<ee62cdcf9e7e3856c1468052944519d6>>
  */
 
 "use strict";
@@ -27,6 +27,7 @@ var ReactNativePrivateInterface = require("react-native/Libraries/ReactPrivate/R
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
   enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
+  enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
   enableShallowPropDiffing = dynamicFlagsUntyped.enableShallowPropDiffing,
   passChildrenWhenCloningPersistedNodes =
     dynamicFlagsUntyped.passChildrenWhenCloningPersistedNodes,
@@ -10772,9 +10773,43 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.actualStartTime = -1;
   this.treeBaseDuration = this.selfBaseDuration = 0;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
+function createFiberImplObject(tag, pendingProps, key, mode) {
+  return {
+    elementType: null,
+    type: null,
+    stateNode: null,
+    return: null,
+    child: null,
+    sibling: null,
+    index: 0,
+    ref: null,
+    refCleanup: null,
+    memoizedProps: null,
+    updateQueue: null,
+    memoizedState: null,
+    dependencies: null,
+    flags: 0,
+    subtreeFlags: 0,
+    deletions: null,
+    lanes: 0,
+    childLanes: 0,
+    alternate: null,
+    tag: tag,
+    key: key,
+    pendingProps: pendingProps,
+    mode: mode,
+    actualDuration: 0,
+    actualStartTime: -1,
+    selfBaseDuration: 0,
+    treeBaseDuration: 0
+  };
+}
+var createFiber = enableObjectFiber
+  ? createFiberImplObject
+  : createFiberImplClass;
 function shouldConstruct(Component) {
   Component = Component.prototype;
   return !(!Component || !Component.isReactComponent);
@@ -11307,7 +11342,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1217 = {
     findFiberByHostInstance: getInstanceFromNode,
     bundleType: 0,
-    version: "19.0.0-native-fb-9647333b3d-20240710",
+    version: "19.0.0-native-fb-fe9828954a-20240710",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -11363,7 +11398,7 @@ var roots = new Map(),
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 });
 exports.createPortal = function (children, containerTag) {
   return createPortal$1(

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactNativeRenderer-dev.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<a62bd730f42d2f8c7b065b31f7fda874>>
+ * @generated SignedSource<<8584109002f045b3c3f3a2b760460d87>>
  */
 
 "use strict";
@@ -13606,9 +13606,48 @@ __DEV__ &&
         "function" !== typeof Object.preventExtensions ||
         Object.preventExtensions(this);
     }
-    function createFiber(tag, pendingProps, key, mode) {
+    function createFiberImplClass(tag, pendingProps, key, mode) {
       return new FiberNode(tag, pendingProps, key, mode);
     }
+    function createFiberImplObject(tag, pendingProps, key, mode) {
+      tag = {
+        elementType: null,
+        type: null,
+        stateNode: null,
+        return: null,
+        child: null,
+        sibling: null,
+        index: 0,
+        ref: null,
+        refCleanup: null,
+        memoizedProps: null,
+        updateQueue: null,
+        memoizedState: null,
+        dependencies: null,
+        flags: 0,
+        subtreeFlags: 0,
+        deletions: null,
+        lanes: 0,
+        childLanes: 0,
+        alternate: null,
+        tag: tag,
+        key: key,
+        pendingProps: pendingProps,
+        mode: mode,
+        actualDuration: 0,
+        actualStartTime: -1,
+        selfBaseDuration: 0,
+        treeBaseDuration: 0,
+        _debugInfo: null,
+        _debugOwner: null,
+        _debugNeedsRemount: !1,
+        _debugHookTypes: null
+      };
+      hasBadMapPolyfill ||
+        "function" !== typeof Object.preventExtensions ||
+        Object.preventExtensions(tag);
+      return tag;
+    }
     function shouldConstruct(Component) {
       Component = Component.prototype;
       return !(!Component || !Component.isReactComponent);
@@ -14344,6 +14383,7 @@ __DEV__ &&
         dynamicFlagsUntyped.consoleManagedByDevToolsDuringStrictMode,
       disableDefaultPropsExceptForClasses =
         dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+      enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
       REACT_LEGACY_ELEMENT_TYPE = Symbol.for("react.element"),
       REACT_ELEMENT_TYPE = REACT_LEGACY_ELEMENT_TYPE,
       REACT_PORTAL_TYPE = Symbol.for("react.portal"),
@@ -16878,6 +16918,9 @@ __DEV__ &&
     } catch (e) {
       hasBadMapPolyfill = !0;
     }
+    var createFiber = enableObjectFiber
+      ? createFiberImplObject
+      : createFiberImplClass;
     var didWarnAboutNestedUpdates = !1;
     var didWarnAboutFindNodeInStrictMode = {};
     var overrideHookState = null,
@@ -16954,11 +16997,11 @@ __DEV__ &&
     var emptyObject = {};
     Object.freeze(emptyObject);
     var isomorphicReactPackageVersion = React.version;
-    if ("19.0.0-native-fb-9647333b3d-20240710" !== isomorphicReactPackageVersion)
+    if ("19.0.0-native-fb-fe9828954a-20240710" !== isomorphicReactPackageVersion)
       throw Error(
         'Incompatible React versions: The "react" and "react-native-renderer" packages must have the exact same version. Instead got:\n  - react:                  ' +
           (isomorphicReactPackageVersion +
-            "\n  - react-native-renderer:  19.0.0-native-fb-9647333b3d-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
+            "\n  - react-native-renderer:  19.0.0-native-fb-fe9828954a-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
       );
     if (
       "function" !==
@@ -17006,12 +17049,12 @@ __DEV__ &&
         scheduleRoot: scheduleRoot,
         setRefreshHandler: setRefreshHandler,
         getCurrentFiber: getCurrentFiberForDevTools,
-        reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+        reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
       });
     })({
       findFiberByHostInstance: getInstanceFromTag,
       bundleType: 1,
-      version: "19.0.0-native-fb-9647333b3d-20240710",
+      version: "19.0.0-native-fb-fe9828954a-20240710",
       rendererPackageName: "react-native-renderer",
       rendererConfig: {
         getInspectorDataForInstance: getInspectorDataForInstance,

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactNativeRenderer-prod.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<508169d743b6b2b964b9d58c4c58e6fc>>
+ * @generated SignedSource<<af1916125b2bb7c87b02e8769c82e722>>
  */
 
 "use strict";
@@ -22,6 +22,7 @@ var ReactNativePrivateInterface = require("react-native/Libraries/ReactPrivate/R
     dynamicFlagsUntyped.consoleManagedByDevToolsDuringStrictMode,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
   ReactSharedInternals =
     React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   REACT_LEGACY_ELEMENT_TYPE = Symbol.for("react.element"),
@@ -10276,9 +10277,39 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.childLanes = this.lanes = 0;
   this.alternate = null;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
+function createFiberImplObject(tag, pendingProps, key, mode) {
+  return {
+    elementType: null,
+    type: null,
+    stateNode: null,
+    return: null,
+    child: null,
+    sibling: null,
+    index: 0,
+    ref: null,
+    refCleanup: null,
+    memoizedProps: null,
+    updateQueue: null,
+    memoizedState: null,
+    dependencies: null,
+    flags: 0,
+    subtreeFlags: 0,
+    deletions: null,
+    lanes: 0,
+    childLanes: 0,
+    alternate: null,
+    tag: tag,
+    key: key,
+    pendingProps: pendingProps,
+    mode: mode
+  };
+}
+var createFiber = enableObjectFiber
+  ? createFiberImplObject
+  : createFiberImplClass;
 function shouldConstruct(Component) {
   Component = Component.prototype;
   return !(!Component || !Component.isReactComponent);
@@ -10755,11 +10786,11 @@ function traverseOwnerTreeUp(hierarchy, instance) {
     traverseOwnerTreeUp(hierarchy, instance);
 }
 var isomorphicReactPackageVersion = React.version;
-if ("19.0.0-native-fb-9647333b3d-20240710" !== isomorphicReactPackageVersion)
+if ("19.0.0-native-fb-fe9828954a-20240710" !== isomorphicReactPackageVersion)
   throw Error(
     'Incompatible React versions: The "react" and "react-native-renderer" packages must have the exact same version. Instead got:\n  - react:                  ' +
       (isomorphicReactPackageVersion +
-        "\n  - react-native-renderer:  19.0.0-native-fb-9647333b3d-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
+        "\n  - react-native-renderer:  19.0.0-native-fb-fe9828954a-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
   );
 if (
   "function" !==
@@ -10809,7 +10840,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1210 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "19.0.0-native-fb-9647333b3d-20240710",
+    version: "19.0.0-native-fb-fe9828954a-20240710",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -10852,7 +10883,7 @@ var internals$jscomp$inline_1457 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1458 = __REACT_DEVTOOLS_GLOBAL_HOOK__;

compiled-rn/facebook-fbsource/xplat/js/react-native-github/Libraries/Renderer/implementations/ReactNativeRenderer-profiling.fb.js

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<2f0f5b8dfbc79dcdb4cdae717c76ffea>>
+ * @generated SignedSource<<d647d246f0a169e6ebdea07cbbed3876>>
  */
 
 "use strict";
@@ -26,6 +26,7 @@ var ReactNativePrivateInterface = require("react-native/Libraries/ReactPrivate/R
     dynamicFlagsUntyped.consoleManagedByDevToolsDuringStrictMode,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableObjectFiber = dynamicFlagsUntyped.enableObjectFiber,
   ReactSharedInternals =
     React.__CLIENT_INTERNALS_DO_NOT_USE_OR_WARN_USERS_THEY_CANNOT_UPGRADE,
   REACT_LEGACY_ELEMENT_TYPE = Symbol.for("react.element"),
@@ -10967,9 +10968,43 @@ function FiberNode(tag, pendingProps, key, mode) {
   this.actualStartTime = -1;
   this.treeBaseDuration = this.selfBaseDuration = 0;
 }
-function createFiber(tag, pendingProps, key, mode) {
+function createFiberImplClass(tag, pendingProps, key, mode) {
   return new FiberNode(tag, pendingProps, key, mode);
 }
+function createFiberImplObject(tag, pendingProps, key, mode) {
+  return {
+    elementType: null,
+    type: null,
+    stateNode: null,
+    return: null,
+    child: null,
+    sibling: null,
+    index: 0,
+    ref: null,
+    refCleanup: null,
+    memoizedProps: null,
+    updateQueue: null,
+    memoizedState: null,
+    dependencies: null,
+    flags: 0,
+    subtreeFlags: 0,
+    deletions: null,
+    lanes: 0,
+    childLanes: 0,
+    alternate: null,
+    tag: tag,
+    key: key,
+    pendingProps: pendingProps,
+    mode: mode,
+    actualDuration: 0,
+    actualStartTime: -1,
+    selfBaseDuration: 0,
+    treeBaseDuration: 0
+  };
+}
+var createFiber = enableObjectFiber
+  ? createFiberImplObject
+  : createFiberImplClass;
 function shouldConstruct(Component) {
   Component = Component.prototype;
   return !(!Component || !Component.isReactComponent);
@@ -11462,11 +11497,11 @@ function traverseOwnerTreeUp(hierarchy, instance) {
     traverseOwnerTreeUp(hierarchy, instance);
 }
 var isomorphicReactPackageVersion = React.version;
-if ("19.0.0-native-fb-9647333b3d-20240710" !== isomorphicReactPackageVersion)
+if ("19.0.0-native-fb-fe9828954a-20240710" !== isomorphicReactPackageVersion)
   throw Error(
     'Incompatible React versions: The "react" and "react-native-renderer" packages must have the exact same version. Instead got:\n  - react:                  ' +
       (isomorphicReactPackageVersion +
-        "\n  - react-native-renderer:  19.0.0-native-fb-9647333b3d-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
+        "\n  - react-native-renderer:  19.0.0-native-fb-fe9828954a-20240710\nLearn more: https://react.dev/warnings/version-mismatch")
   );
 if (
   "function" !==
@@ -11516,7 +11551,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1291 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "19.0.0-native-fb-9647333b3d-20240710",
+    version: "19.0.0-native-fb-fe9828954a-20240710",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -11572,7 +11607,7 @@ var roots = new Map(),
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-native-fb-9647333b3d-20240710"
+  reconcilerVersion: "19.0.0-native-fb-fe9828954a-20240710"
 });
 exports.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = {
   computeComponentStackForErrorReporting: function (reactTag) {