Introduce a faster version of the addProperties function (#28969)

## Summary

This PR introduces a faster version of the `addProperties` function.
This new function is basically the `diffProperties` with `prevProps` set
to `null`, propagated constants, and all the unreachable code paths
collapsed.

## How did you test this change?

I've tested this change with [the benchmark
app](https://github.com/react-native-community/RNNewArchitectureApp/tree/new-architecture-benchmarks)
and got ~4.4% improvement in the view creation time.

DiffTrain build for commit https://github.com/facebook/react/commit/73bcdfbae57545aa8f88ecdf67426275610b5573.

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<4c8919e8adb15c1f31e630f08e73d86f>>
+ * @generated SignedSource<<af4ef85b8fe75e4033608d078d795833>>
  */
 
 'use strict';
@@ -25,7 +25,8 @@ var dynamicFlags = dynamicFlagsUntyped; // We destructure each value before re-e
 
 var enableComponentStackLocations = dynamicFlags.enableComponentStackLocations,
     enableRenderableContext = dynamicFlags.enableRenderableContext,
-    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses; // The rest of the flags are static for better dead code elimination.
+    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses;
+ // The rest of the flags are static for better dead code elimination.
 var enableDebugTracing = false;
 var enableScopeAPI = false;
 var enableLegacyHidden = false;

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<659c779c0ac134a5010cd8f6556b1b17>>
+ * @generated SignedSource<<ce4cd05ddf193df647a49f1ddbcc0aed>>
  */
 
 'use strict';
@@ -25,7 +25,8 @@ var dynamicFlags = dynamicFlagsUntyped; // We destructure each value before re-e
 
 var enableComponentStackLocations = dynamicFlags.enableComponentStackLocations,
     enableRenderableContext = dynamicFlags.enableRenderableContext,
-    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses; // The rest of the flags are static for better dead code elimination.
+    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses;
+ // The rest of the flags are static for better dead code elimination.
 var enableDebugTracing = false;
 var enableScopeAPI = false;
 var enableLegacyHidden = false;

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

@@ -7,7 +7,7 @@
  * @noflow
  * @nolint
  * @preventMunge
- * @generated SignedSource<<0f88cc3fda756e3467304abd247a3db7>>
+ * @generated SignedSource<<f47b166be53dccb56c8e3adcf1ba0dfb>>
  */
 
 'use strict';
@@ -27,7 +27,7 @@ if (
 }
           var dynamicFlagsUntyped = require('ReactNativeInternalFeatureFlags');
 
-var ReactVersion = '19.0.0-beta-6a68f48e';
+var ReactVersion = '19.0.0-beta-45cd200f';
 
 // Re-export dynamic flags from the internal module.
 var dynamicFlags = dynamicFlagsUntyped; // We destructure each value before re-exporting to avoid a dynamic look-up on
@@ -36,7 +36,8 @@ var dynamicFlags = dynamicFlagsUntyped; // We destructure each value before re-e
 var enableAsyncActions = dynamicFlags.enableAsyncActions,
     enableComponentStackLocations = dynamicFlags.enableComponentStackLocations,
     enableRenderableContext = dynamicFlags.enableRenderableContext,
-    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses; // The rest of the flags are static for better dead code elimination.
+    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses;
+ // The rest of the flags are static for better dead code elimination.
 var enableDebugTracing = false;
 var enableScopeAPI = false;
 var enableLegacyHidden = false;

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

@@ -1 +1 @@
-4508873393058e86bed308b56e49ec883ece59d1
+73bcdfbae57545aa8f88ecdf67426275610b5573

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<<3b1926ec8be22ff21a461aebe15a8dec>>
+ * @generated SignedSource<<438e1cd98ae204c6c07245d77bdf2eb2>>
  */
 
 'use strict';
@@ -2003,7 +2003,8 @@ var alwaysThrottleRetries = dynamicFlags.alwaysThrottleRetries,
     enableUnifiedSyncLane = dynamicFlags.enableUnifiedSyncLane,
     passChildrenWhenCloningPersistedNodes = dynamicFlags.passChildrenWhenCloningPersistedNodes,
     useModernStrictMode = dynamicFlags.useModernStrictMode,
-    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses; // The rest of the flags are static for better dead code elimination.
+    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses,
+    enableAddPropertiesFastPath = dynamicFlags.enableAddPropertiesFastPath; // The rest of the flags are static for better dead code elimination.
 var enableSchedulingProfiler = true;
 var enableProfilerTimer = true;
 var enableProfilerCommitHooks = true;
@@ -2352,14 +2353,70 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
 
   return updatePayload;
 }
+
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var attributeConfig;
+  var nextProp;
+
+  for (var propKey in nextProps) {
+    nextProp = nextProps[propKey];
+
+    if (nextProp === undefined) {
+      continue;
+    }
+
+    attributeConfig = validAttributes[propKey];
+
+    if (attributeConfig === undefined) {
+      continue;
+    }
+
+    if (typeof nextProp === 'function') {
+      nextProp = true;
+    }
+
+    if (typeof attributeConfig !== 'object') {
+      if (!updatePayload) {
+        updatePayload = {};
+      }
+
+      updatePayload[propKey] = nextProp;
+      continue;
+    }
+
+    if (typeof attributeConfig.process === 'function') {
+      if (!updatePayload) {
+        updatePayload = {};
+      }
+
+      updatePayload[propKey] = attributeConfig.process(nextProp);
+      continue;
+    }
+
+    if (isArray(nextProp)) {
+      for (var i = 0; i < nextProp.length; i++) {
+        updatePayload = fastAddProperties(updatePayload, nextProp[i], attributeConfig);
+      }
+
+      continue;
+    }
+
+    updatePayload = fastAddProperties(updatePayload, nextProp, attributeConfig);
+  }
+
+  return updatePayload;
+}
 /**
  * addProperties adds all the valid props to the payload after being processed.
  */
 
 
 function addProperties(updatePayload, props, validAttributes) {
-  // TODO: Fast path
-  return diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+  if (enableAddPropertiesFastPath) {
+    return fastAddProperties(updatePayload, props, validAttributes);
+  } else {
+    return diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+  }
 }
 /**
  * clearProperties clears all the previous props by adding a null sentinel
@@ -26075,7 +26132,7 @@ identifierPrefix, onUncaughtError, onCaughtError, onRecoverableError, transition
   return root;
 }
 
-var ReactVersion = '19.0.0-beta-197956b7';
+var ReactVersion = '19.0.0-beta-8a57d9cf';
 
 /*
  * The `'' + value` pattern (used in perf-sensitive code) throws for Symbol

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<<ad84473bdbce0975ceaaac6469a759ac>>
+ * @generated SignedSource<<97e06df55397eea2903e5bffade5f61e>>
  */
 
 "use strict";
@@ -983,6 +983,7 @@ var alwaysThrottleRetries = dynamicFlagsUntyped.alwaysThrottleRetries,
     dynamicFlagsUntyped.passChildrenWhenCloningPersistedNodes,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
   emptyObject$1 = {},
   removedKeys = null,
   removedKeyCount = 0,
@@ -1091,12 +1092,7 @@ function diffNestedProperty(
 function addNestedProperty(updatePayload, nextProp, validAttributes) {
   if (!nextProp) return updatePayload;
   if (!isArrayImpl(nextProp))
-    return diffProperties(
-      updatePayload,
-      emptyObject$1,
-      nextProp,
-      validAttributes
-    );
+    return addProperties(updatePayload, nextProp, validAttributes);
   for (var i = 0; i < nextProp.length; i++)
     updatePayload = addNestedProperty(
       updatePayload,
@@ -1206,6 +1202,44 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
               )))));
   return updatePayload;
 }
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var propKey;
+  for (propKey in nextProps) {
+    var nextProp = nextProps[propKey];
+    if (void 0 !== nextProp) {
+      var attributeConfig = validAttributes[propKey];
+      if (void 0 !== attributeConfig)
+        if (
+          ("function" === typeof nextProp && (nextProp = !0),
+          "object" !== typeof attributeConfig)
+        )
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = nextProp);
+        else if ("function" === typeof attributeConfig.process)
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = attributeConfig.process(nextProp));
+        else if (isArrayImpl(nextProp))
+          for (var i = 0; i < nextProp.length; i++)
+            updatePayload = fastAddProperties(
+              updatePayload,
+              nextProp[i],
+              attributeConfig
+            );
+        else
+          updatePayload = fastAddProperties(
+            updatePayload,
+            nextProp,
+            attributeConfig
+          );
+    }
+  }
+  return updatePayload;
+}
+function addProperties(updatePayload, props, validAttributes) {
+  return enableAddPropertiesFastPath
+    ? fastAddProperties(updatePayload, props, validAttributes)
+    : diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+}
 function batchedUpdatesImpl(fn, bookkeeping) {
   return fn(bookkeeping);
 }
@@ -1604,9 +1638,8 @@ var scheduleTimeout = setTimeout,
   cancelTimeout = clearTimeout;
 function cloneHiddenInstance(instance) {
   var node = instance.node;
-  var JSCompiler_inline_result = diffProperties(
+  var JSCompiler_inline_result = addProperties(
     null,
-    emptyObject$1,
     { style: { display: "none" } },
     instance.canonical.viewConfig.validAttributes
   );
@@ -7351,9 +7384,8 @@ function completeWork(current, workInProgress, renderLanes) {
         current = nextReactTag;
         nextReactTag += 2;
         renderLanes = getViewConfigForType(renderLanes);
-        newChildSet = diffProperties(
+        newChildSet = addProperties(
           null,
-          emptyObject$1,
           newProps,
           renderLanes.validAttributes
         );
@@ -10613,7 +10645,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1118 = {
     findFiberByHostInstance: getInstanceFromNode,
     bundleType: 0,
-    version: "19.0.0-beta-9a489885",
+    version: "19.0.0-beta-5fd3967c",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -10656,7 +10688,7 @@ var internals$jscomp$inline_1385 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-beta-9a489885"
+  reconcilerVersion: "19.0.0-beta-5fd3967c"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1386 = __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<<0cb20923f97d85199b33fe4f36251a51>>
+ * @generated SignedSource<<6a5f873752147d634c1a5052381376b9>>
  */
 
 "use strict";
@@ -987,6 +987,7 @@ var alwaysThrottleRetries = dynamicFlagsUntyped.alwaysThrottleRetries,
     dynamicFlagsUntyped.passChildrenWhenCloningPersistedNodes,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
   emptyObject$1 = {},
   removedKeys = null,
   removedKeyCount = 0,
@@ -1095,12 +1096,7 @@ function diffNestedProperty(
 function addNestedProperty(updatePayload, nextProp, validAttributes) {
   if (!nextProp) return updatePayload;
   if (!isArrayImpl(nextProp))
-    return diffProperties(
-      updatePayload,
-      emptyObject$1,
-      nextProp,
-      validAttributes
-    );
+    return addProperties(updatePayload, nextProp, validAttributes);
   for (var i = 0; i < nextProp.length; i++)
     updatePayload = addNestedProperty(
       updatePayload,
@@ -1210,6 +1206,44 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
               )))));
   return updatePayload;
 }
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var propKey;
+  for (propKey in nextProps) {
+    var nextProp = nextProps[propKey];
+    if (void 0 !== nextProp) {
+      var attributeConfig = validAttributes[propKey];
+      if (void 0 !== attributeConfig)
+        if (
+          ("function" === typeof nextProp && (nextProp = !0),
+          "object" !== typeof attributeConfig)
+        )
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = nextProp);
+        else if ("function" === typeof attributeConfig.process)
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = attributeConfig.process(nextProp));
+        else if (isArrayImpl(nextProp))
+          for (var i = 0; i < nextProp.length; i++)
+            updatePayload = fastAddProperties(
+              updatePayload,
+              nextProp[i],
+              attributeConfig
+            );
+        else
+          updatePayload = fastAddProperties(
+            updatePayload,
+            nextProp,
+            attributeConfig
+          );
+    }
+  }
+  return updatePayload;
+}
+function addProperties(updatePayload, props, validAttributes) {
+  return enableAddPropertiesFastPath
+    ? fastAddProperties(updatePayload, props, validAttributes)
+    : diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+}
 function batchedUpdatesImpl(fn, bookkeeping) {
   return fn(bookkeeping);
 }
@@ -1726,9 +1760,8 @@ var scheduleTimeout = setTimeout,
   cancelTimeout = clearTimeout;
 function cloneHiddenInstance(instance) {
   var node = instance.node;
-  var JSCompiler_inline_result = diffProperties(
+  var JSCompiler_inline_result = addProperties(
     null,
-    emptyObject$1,
     { style: { display: "none" } },
     instance.canonical.viewConfig.validAttributes
   );
@@ -7617,9 +7650,8 @@ function completeWork(current, workInProgress, renderLanes) {
         current = nextReactTag;
         nextReactTag += 2;
         renderLanes = getViewConfigForType(renderLanes);
-        newChildSet = diffProperties(
+        newChildSet = addProperties(
           null,
-          emptyObject$1,
           newProps,
           renderLanes.validAttributes
         );
@@ -11318,7 +11350,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1198 = {
     findFiberByHostInstance: getInstanceFromNode,
     bundleType: 0,
-    version: "19.0.0-beta-781ecc88",
+    version: "19.0.0-beta-87fa5d3f",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -11374,7 +11406,7 @@ var roots = new Map(),
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-beta-781ecc88"
+  reconcilerVersion: "19.0.0-beta-87fa5d3f"
 });
 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<<d0205c5405c0a28da5aef95cacca169a>>
+ * @generated SignedSource<<bedf6c7a6f00f33bfdcba4960c3569a5>>
  */
 
 'use strict';
@@ -2350,7 +2350,8 @@ var alwaysThrottleRetries = dynamicFlags.alwaysThrottleRetries,
     enableRenderableContext = dynamicFlags.enableRenderableContext,
     enableUnifiedSyncLane = dynamicFlags.enableUnifiedSyncLane,
     useModernStrictMode = dynamicFlags.useModernStrictMode,
-    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses; // The rest of the flags are static for better dead code elimination.
+    disableDefaultPropsExceptForClasses = dynamicFlags.disableDefaultPropsExceptForClasses,
+    enableAddPropertiesFastPath = dynamicFlags.enableAddPropertiesFastPath; // The rest of the flags are static for better dead code elimination.
 var enableSchedulingProfiler = true;
 var enableProfilerTimer = true;
 var enableProfilerCommitHooks = true;
@@ -3382,14 +3383,70 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
 
   return updatePayload;
 }
+
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var attributeConfig;
+  var nextProp;
+
+  for (var propKey in nextProps) {
+    nextProp = nextProps[propKey];
+
+    if (nextProp === undefined) {
+      continue;
+    }
+
+    attributeConfig = validAttributes[propKey];
+
+    if (attributeConfig === undefined) {
+      continue;
+    }
+
+    if (typeof nextProp === 'function') {
+      nextProp = true;
+    }
+
+    if (typeof attributeConfig !== 'object') {
+      if (!updatePayload) {
+        updatePayload = {};
+      }
+
+      updatePayload[propKey] = nextProp;
+      continue;
+    }
+
+    if (typeof attributeConfig.process === 'function') {
+      if (!updatePayload) {
+        updatePayload = {};
+      }
+
+      updatePayload[propKey] = attributeConfig.process(nextProp);
+      continue;
+    }
+
+    if (isArray(nextProp)) {
+      for (var i = 0; i < nextProp.length; i++) {
+        updatePayload = fastAddProperties(updatePayload, nextProp[i], attributeConfig);
+      }
+
+      continue;
+    }
+
+    updatePayload = fastAddProperties(updatePayload, nextProp, attributeConfig);
+  }
+
+  return updatePayload;
+}
 /**
  * addProperties adds all the valid props to the payload after being processed.
  */
 
 
 function addProperties(updatePayload, props, validAttributes) {
-  // TODO: Fast path
-  return diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+  if (enableAddPropertiesFastPath) {
+    return fastAddProperties(updatePayload, props, validAttributes);
+  } else {
+    return diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+  }
 }
 /**
  * clearProperties clears all the previous props by adding a null sentinel
@@ -26487,7 +26544,7 @@ identifierPrefix, onUncaughtError, onCaughtError, onRecoverableError, transition
   return root;
 }
 
-var ReactVersion = '19.0.0-beta-0126d00e';
+var ReactVersion = '19.0.0-beta-f77489ba';
 
 /*
  * The `'' + value` pattern (used in perf-sensitive code) throws for Symbol

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<<29b6d6559ba3d8f7ff9f1592b99ed8f4>>
+ * @generated SignedSource<<2f2f979409296aff4c730c9db543982b>>
  */
 
 "use strict";
@@ -1126,6 +1126,7 @@ var alwaysThrottleRetries = dynamicFlagsUntyped.alwaysThrottleRetries,
   enableUnifiedSyncLane = dynamicFlagsUntyped.enableUnifiedSyncLane,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
   REACT_LEGACY_ELEMENT_TYPE = Symbol.for("react.element"),
   REACT_PORTAL_TYPE = Symbol.for("react.portal"),
   REACT_FRAGMENT_TYPE = Symbol.for("react.fragment"),
@@ -1492,12 +1493,7 @@ function diffNestedProperty(
 function addNestedProperty(updatePayload, nextProp, validAttributes) {
   if (!nextProp) return updatePayload;
   if (!isArrayImpl(nextProp))
-    return diffProperties(
-      updatePayload,
-      emptyObject$1,
-      nextProp,
-      validAttributes
-    );
+    return addProperties(updatePayload, nextProp, validAttributes);
   for (var i = 0; i < nextProp.length; i++)
     updatePayload = addNestedProperty(
       updatePayload,
@@ -1607,6 +1603,44 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
               )))));
   return updatePayload;
 }
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var propKey;
+  for (propKey in nextProps) {
+    var nextProp = nextProps[propKey];
+    if (void 0 !== nextProp) {
+      var attributeConfig = validAttributes[propKey];
+      if (void 0 !== attributeConfig)
+        if (
+          ("function" === typeof nextProp && (nextProp = !0),
+          "object" !== typeof attributeConfig)
+        )
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = nextProp);
+        else if ("function" === typeof attributeConfig.process)
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = attributeConfig.process(nextProp));
+        else if (isArrayImpl(nextProp))
+          for (var i = 0; i < nextProp.length; i++)
+            updatePayload = fastAddProperties(
+              updatePayload,
+              nextProp[i],
+              attributeConfig
+            );
+        else
+          updatePayload = fastAddProperties(
+            updatePayload,
+            nextProp,
+            attributeConfig
+          );
+    }
+  }
+  return updatePayload;
+}
+function addProperties(updatePayload, props, validAttributes) {
+  return enableAddPropertiesFastPath
+    ? fastAddProperties(updatePayload, props, validAttributes)
+    : diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+}
 function mountSafeCallback_NOT_REALLY_SAFE(context, callback) {
   return function () {
     if (
@@ -1657,9 +1691,8 @@ var ReactNativeFiberHostComponent = (function () {
         );
     };
     _proto.setNativeProps = function (nativeProps) {
-      nativeProps = diffProperties(
+      nativeProps = addProperties(
         null,
-        emptyObject$1,
         nativeProps,
         this.viewConfig.validAttributes
       );
@@ -7238,12 +7271,7 @@ function completeWork(current, workInProgress, renderLanes) {
         renderLanes = rootInstanceStackCursor.current;
         current = allocateTag();
         type = getViewConfigForType(type);
-        var updatePayload = diffProperties(
-          null,
-          emptyObject$1,
-          newProps,
-          type.validAttributes
-        );
+        var updatePayload = addProperties(null, newProps, type.validAttributes);
         ReactNativePrivateInterface.UIManager.createView(
           current,
           type.uiViewClassName,
@@ -8455,9 +8483,8 @@ function commitMutationEffectsOnFiber(finishedWork, root) {
               try {
                 if (((newProps = root.stateNode), viewConfig)) {
                   var viewConfig$jscomp$0 = newProps.viewConfig;
-                  var updatePayload$jscomp$0 = diffProperties(
+                  var updatePayload$jscomp$0 = addProperties(
                     null,
-                    emptyObject$1,
                     { style: { display: "none" } },
                     viewConfig$jscomp$0.validAttributes
                   );
@@ -10834,7 +10861,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1186 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "19.0.0-beta-8879f21c",
+    version: "19.0.0-beta-7054616c",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -10877,7 +10904,7 @@ var internals$jscomp$inline_1470 = {
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-beta-8879f21c"
+  reconcilerVersion: "19.0.0-beta-7054616c"
 };
 if ("undefined" !== typeof __REACT_DEVTOOLS_GLOBAL_HOOK__) {
   var hook$jscomp$inline_1471 = __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<<06820f12c0e85d0af8fe960e3776ec34>>
+ * @generated SignedSource<<a15721f6aa7972d4b9e01678b2afe90a>>
  */
 
 "use strict";
@@ -1130,6 +1130,7 @@ var alwaysThrottleRetries = dynamicFlagsUntyped.alwaysThrottleRetries,
   enableUnifiedSyncLane = dynamicFlagsUntyped.enableUnifiedSyncLane,
   disableDefaultPropsExceptForClasses =
     dynamicFlagsUntyped.disableDefaultPropsExceptForClasses,
+  enableAddPropertiesFastPath = dynamicFlagsUntyped.enableAddPropertiesFastPath,
   REACT_LEGACY_ELEMENT_TYPE = Symbol.for("react.element"),
   REACT_PORTAL_TYPE = Symbol.for("react.portal"),
   REACT_FRAGMENT_TYPE = Symbol.for("react.fragment"),
@@ -1496,12 +1497,7 @@ function diffNestedProperty(
 function addNestedProperty(updatePayload, nextProp, validAttributes) {
   if (!nextProp) return updatePayload;
   if (!isArrayImpl(nextProp))
-    return diffProperties(
-      updatePayload,
-      emptyObject$1,
-      nextProp,
-      validAttributes
-    );
+    return addProperties(updatePayload, nextProp, validAttributes);
   for (var i = 0; i < nextProp.length; i++)
     updatePayload = addNestedProperty(
       updatePayload,
@@ -1611,6 +1607,44 @@ function diffProperties(updatePayload, prevProps, nextProps, validAttributes) {
               )))));
   return updatePayload;
 }
+function fastAddProperties(updatePayload, nextProps, validAttributes) {
+  var propKey;
+  for (propKey in nextProps) {
+    var nextProp = nextProps[propKey];
+    if (void 0 !== nextProp) {
+      var attributeConfig = validAttributes[propKey];
+      if (void 0 !== attributeConfig)
+        if (
+          ("function" === typeof nextProp && (nextProp = !0),
+          "object" !== typeof attributeConfig)
+        )
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = nextProp);
+        else if ("function" === typeof attributeConfig.process)
+          updatePayload || (updatePayload = {}),
+            (updatePayload[propKey] = attributeConfig.process(nextProp));
+        else if (isArrayImpl(nextProp))
+          for (var i = 0; i < nextProp.length; i++)
+            updatePayload = fastAddProperties(
+              updatePayload,
+              nextProp[i],
+              attributeConfig
+            );
+        else
+          updatePayload = fastAddProperties(
+            updatePayload,
+            nextProp,
+            attributeConfig
+          );
+    }
+  }
+  return updatePayload;
+}
+function addProperties(updatePayload, props, validAttributes) {
+  return enableAddPropertiesFastPath
+    ? fastAddProperties(updatePayload, props, validAttributes)
+    : diffProperties(updatePayload, emptyObject$1, props, validAttributes);
+}
 function mountSafeCallback_NOT_REALLY_SAFE(context, callback) {
   return function () {
     if (
@@ -1661,9 +1695,8 @@ var ReactNativeFiberHostComponent = (function () {
         );
     };
     _proto.setNativeProps = function (nativeProps) {
-      nativeProps = diffProperties(
+      nativeProps = addProperties(
         null,
-        emptyObject$1,
         nativeProps,
         this.viewConfig.validAttributes
       );
@@ -7504,12 +7537,7 @@ function completeWork(current, workInProgress, renderLanes) {
         renderLanes = rootInstanceStackCursor.current;
         current = allocateTag();
         type = getViewConfigForType(type);
-        var updatePayload = diffProperties(
-          null,
-          emptyObject$1,
-          newProps,
-          type.validAttributes
-        );
+        var updatePayload = addProperties(null, newProps, type.validAttributes);
         ReactNativePrivateInterface.UIManager.createView(
           current,
           type.uiViewClassName,
@@ -8938,9 +8966,8 @@ function commitMutationEffectsOnFiber(finishedWork, root) {
               try {
                 if (((newProps = root.stateNode), viewConfig)) {
                   var viewConfig$jscomp$0 = newProps.viewConfig;
-                  var updatePayload$jscomp$0 = diffProperties(
+                  var updatePayload$jscomp$0 = addProperties(
                     null,
-                    emptyObject$1,
                     { style: { display: "none" } },
                     viewConfig$jscomp$0.validAttributes
                   );
@@ -11540,7 +11567,7 @@ var roots = new Map(),
   devToolsConfig$jscomp$inline_1266 = {
     findFiberByHostInstance: getInstanceFromTag,
     bundleType: 0,
-    version: "19.0.0-beta-2ba13034",
+    version: "19.0.0-beta-650dcd3b",
     rendererPackageName: "react-native-renderer",
     rendererConfig: {
       getInspectorDataForInstance: getInspectorDataForInstance,
@@ -11596,7 +11623,7 @@ var roots = new Map(),
   scheduleRoot: null,
   setRefreshHandler: null,
   getCurrentFiber: null,
-  reconcilerVersion: "19.0.0-beta-2ba13034"
+  reconcilerVersion: "19.0.0-beta-650dcd3b"
 });
 exports.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED = {
   computeComponentStackForErrorReporting: function (reactTag) {