From cdf5ffe44949df668ac3c1c84a503414091802e0 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 11 Mar 2026 13:36:34 +0530
Subject: [PATCH 01/14] Update community template

---
 packages/@rnw-scripts/integrate-rn/package.json | 4 ++--
 vnext/Scripts/creaternwapp.cmd                  | 2 +-
 yarn.lock                                       | 8 ++++----
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/packages/@rnw-scripts/integrate-rn/package.json b/packages/@rnw-scripts/integrate-rn/package.json
index 45f483189a0..d04b89a0a9d 100644
--- a/packages/@rnw-scripts/integrate-rn/package.json
+++ b/packages/@rnw-scripts/integrate-rn/package.json
@@ -20,7 +20,7 @@
     "integrate-rn": "./bin.js"
   },
   "dependencies": {
-    "@react-native-community/template": "0.83.2",
+    "@react-native-community/template": "0.84.1",
     "@react-native-windows/find-repo-root": "^0.0.0-canary.99",
     "@react-native-windows/fs": "^0.0.0-canary.70",
     "@react-native-windows/package-utils": "^0.0.0-canary.96",
@@ -62,4 +62,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/vnext/Scripts/creaternwapp.cmd b/vnext/Scripts/creaternwapp.cmd
index 5f94a29f76a..fd088ff07f0 100644
--- a/vnext/Scripts/creaternwapp.cmd
+++ b/vnext/Scripts/creaternwapp.cmd
@@ -117,7 +117,7 @@ if not "x%RN_VERSION:nightly=%"=="x%RN_VERSION%" (
   REM Do not change, this makes sure we always get a nightly template when still consuming a nightly RN and NOT a later "stable" template that may have been released
   REM set RNCLI_TEMPLATE=--template "@react-native-community/template@^%RN_VERSION:~0,4%.0-"
   REM Windows we need to manually update this with every integration #15124
-  set RNCLI_TEMPLATE=--template "@react-native-community/template@0.83.2"
+  set RNCLI_TEMPLATE=--template "@react-native-community/template@0.84.1"
 )
 
 @echo creaternwapp.cmd: Creating base RN app project with: npx --yes @react-native-community/cli@%RNCLI_VERSION% init %APP_NAME% --version %RN_VERSION% %RNCLI_TEMPLATE% --verbose --skip-install --install-pods false --skip-git-init true
diff --git a/yarn.lock b/yarn.lock
index 0e3acbe17a5..362a5dc8dd0 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2550,10 +2550,10 @@
     prompts "^2.4.2"
     semver "^7.5.2"
 
-"@react-native-community/template@0.83.2":
-  version "0.83.2"
-  resolved "https://registry.yarnpkg.com/@react-native-community/template/-/template-0.83.2.tgz#f539d6355394b3c5351f830db3eb3b82a0f2874f"
-  integrity sha512-WuTSVneujmyAy3j9LPOepOvXNDZ8P+aLrdmKVakPZ3i3X7Hny/5H4+PVeg78BbgfupX6dHg/ga05k63vNH3pCw==
+"@react-native-community/template@0.84.1":
+  version "0.84.1"
+  resolved "https://registry.yarnpkg.com/@react-native-community/template/-/template-0.84.1.tgz#1f8a79ff20c9d8802b55bd84a4d79fb0f6edcc3e"
+  integrity sha512-hvWS9dRk4H5zbG8FO6/3lb77owa6Z14GQADC7ZBTwRGx0MknNLevvum5Ue4EBV203YTEDFbCUOQXJvOWtKuIlg==
 
 "@react-native-picker/picker@^2.5.1":
   version "2.11.4"

From 32e531a986aa8e84730ab0a4d6c37918e1737e7d Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 11 Mar 2026 13:43:47 +0530
Subject: [PATCH 02/14] Integrate 0.84.0-nightly-20251212-dd390dbbe

- https://github.com/facebook/react-native/compare/502efe1cc...dd390dbbe
---
 .../react-native-win32-tester/overrides.json  |   4 +-
 .../react-native-win32-tester/package.json    |   8 +-
 .../src/js/utils/RNTesterList.win32.js        |  29 ++++-
 .../react-native-win32/.flowconfig            |   9 +-
 .../react-native-win32/overrides.json         |  22 ++--
 .../react-native-win32/package.json           |  22 ++--
 .../AccessibilityInfo/AccessibilityInfo.d.ts  |  12 ++
 .../AccessibilityInfo.win32.js                |  12 ++
 .../Libraries/Components/Button.win32.js      |   3 -
 .../Components/View/ViewPropTypes.win32.js    |  10 ++
 .../src-win/Libraries/Text/Text.win32.js      |  44 ++++++-
 .../Libraries/Types/CoreEventTypes.win32.js   |  34 +++++
 .../react-native-win32/src-win/index.win32.js |   3 +
 .../src-win/index.win32.js.flow               |   8 ++
 .../animated/NativeAnimatedHelper.win32.js    |  30 ++++-
 .../automation-channel/package.json           |   2 +-
 .../tester/overrides.json                     |   8 +-
 .../@react-native-windows/tester/package.json |  10 +-
 .../js/examples/Text/TextExample.windows.js   |   4 +
 .../Text/TextSharedExamples.windows.js        |  59 ++++++++-
 .../src/js/utils/RNTesterList.windows.js      |  21 +++-
 .../@react-native/monorepo/overrides.json     |   4 +-
 packages/@react-native/monorepo/package.json  |  15 ++-
 .../tester/js/utils/RNTesterList.android.js   |  21 +++-
 .../tester/js/utils/RNTesterList.ios.js       |  15 ++-
 packages/@react-native/tester/overrides.json  |  16 +--
 packages/@react-native/tester/package.json    |  23 +++-
 .../babel-react-native-config/package.json    |   4 +-
 .../@rnw-scripts/eslint-config/package.json   |   2 +-
 .../metro-dev-config/package.json             |   2 +-
 packages/e2e-test-app-fabric/package.json     |   6 +-
 packages/playground/package.json              |   6 +-
 packages/sample-app-fabric/package.json       |   6 +-
 packages/sample-custom-component/package.json |   6 +-
 vnext/.flowconfig                             |   9 +-
 .../jsi/jsi/test/testlib.cpp                  |  35 ++++++
 .../core/ReactCommon/TurboModule.h            |   1 -
 .../renderer/components/image/conversions.h   |   8 ++
 .../react/renderer/imagemanager/primitives.h  |  27 +++-
 vnext/overrides.json                          |  28 ++---
 vnext/package.json                            |  24 ++--
 .../AccessibilityInfo.windows.js              |   7 +-
 .../Libraries/Components/Button.windows.js    |   3 -
 .../Components/View/ViewPropTypes.windows.js  |  14 +++
 vnext/src-win/Libraries/Text/Text.windows.js  |  44 ++++++-
 .../Libraries/Types/CoreEventTypes.windows.js |  34 +++++
 vnext/src-win/index.windows.js                |   3 +
 vnext/src-win/index.windows.js.flow           |   8 ++
 yarn.lock                                     | 119 +++++++++++++++---
 49 files changed, 687 insertions(+), 157 deletions(-)

diff --git a/packages/@office-iss/react-native-win32-tester/overrides.json b/packages/@office-iss/react-native-win32-tester/overrides.json
index fc2ace5294e..fa6e44d6503 100644
--- a/packages/@office-iss/react-native-win32-tester/overrides.json
+++ b/packages/@office-iss/react-native-win32-tester/overrides.json
@@ -5,7 +5,7 @@
   "excludePatterns": [
     "src/js/examples-win32/**"
   ],
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "patch",
@@ -42,7 +42,7 @@
       "type": "derived",
       "file": "src/js/utils/RNTesterList.win32.js",
       "baseFile": "packages/rn-tester/js/utils/RNTesterList.android.js",
-      "baseHash": "419d588f738d7f9fc252019e74ca7bc92c6a03bf"
+      "baseHash": "21f111f08b53ae5d60a7c03044ae64d867d93dbb"
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/@office-iss/react-native-win32-tester/package.json b/packages/@office-iss/react-native-win32-tester/package.json
index 22965e9817d..277c4852b1a 100644
--- a/packages/@office-iss/react-native-win32-tester/package.json
+++ b/packages/@office-iss/react-native-win32-tester/package.json
@@ -11,7 +11,7 @@
     "validate-overrides": "react-native-platform-override validate"
   },
   "dependencies": {
-    "@react-native/tester": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/tester": "0.84.0-nightly-20251212-dd390dbbe",
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "flow-enums-runtime": "^0.0.6"
@@ -19,7 +19,7 @@
   "peerDependencies": {
     "@office-iss/react-native-win32": "^0.0.0-canary.307",
     "react": "19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc"
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe"
   },
   "devDependencies": {
     "@office-iss/react-native-win32": "^0.0.0-canary.307",
@@ -30,11 +30,11 @@
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
     "just-scripts": "^1.3.3",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
     "typescript": "5.0.4"
   },
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js b/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
index 62255f911e1..c6fa1406f4d 100644
--- a/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
+++ b/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
@@ -79,6 +79,19 @@ const Components: Array<RNTesterModuleInfo> = [
     module: require('../examples/KeyboardAvoidingView/KeyboardAvoidingViewExample'),
   },
   {
+<<<<<<< Upstream
+    key: 'KeyEvents',
+    module: require('../examples/KeyboardEventsExample/KeyboardEventsExample')
+      .default,
+  },
+  {
+    key: 'ModalExample',
+    category: 'UI',
+    module: require('../examples/Modal/ModalExample'),
+  },
+  {
+=======
+>>>>>>> Override
     key: 'NewAppScreenExample',
     module: require('../examples/NewAppScreen/NewAppScreenExample'),
   },
@@ -364,11 +377,17 @@ const APIs: Array<RNTesterModuleInfo> = ([
     key: 'LegacyModuleExample',
     module: require('../examples/TurboModule/LegacyModuleExample'),
   },
-  {
-    key: 'TurboCxxModuleExample',
-    category: 'Basic',
-    module: require('../examples/TurboModule/TurboCxxModuleExample'),
-  },
+  // Basic check to detect the availability of the IntersectionObserver API.
+  // $FlowExpectedError[cannot-resolve-name]
+  ...(typeof IntersectionObserver === 'function'
+    ? [
+        {
+          key: 'IntersectionObserver',
+          category: 'UI',
+          module: require('../examples/IntersectionObserver/IntersectionObserverIndex'),
+        },
+      ]
+    : []),
   // Basic check to detect the availability of the modern Performance API.
   ...(typeof performance.getEntries === 'function'
     ? [
diff --git a/packages/@office-iss/react-native-win32/.flowconfig b/packages/@office-iss/react-native-win32/.flowconfig
index 12eb888bc23..ab424ccae65 100644
--- a/packages/@office-iss/react-native-win32/.flowconfig
+++ b/packages/@office-iss/react-native-win32/.flowconfig
@@ -139,12 +139,19 @@ module.file_ext=.win32.js
 
 munge_underscores=true
 
+<<<<<<< Upstream
+module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
+module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
+module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
+=======
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/index.win32.js'
 module.name_mapper='^@office-iss/react-native-win32$' -> '<PROJECT_ROOT>/index.win32.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@office-iss/react-native-win32/\(.*\)$' -> '<PROJECT_ROOT>\/1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
+>>>>>>> Override
 
 module.system.haste.module_ref_prefix=m#
 
@@ -175,4 +182,4 @@ untyped-import
 untyped-type-import
 
 [version]
-^0.289.0
+^0.293.0
diff --git a/packages/@office-iss/react-native-win32/overrides.json b/packages/@office-iss/react-native-win32/overrides.json
index 8c1deb72816..24300baad9b 100644
--- a/packages/@office-iss/react-native-win32/overrides.json
+++ b/packages/@office-iss/react-native-win32/overrides.json
@@ -7,25 +7,25 @@
     "**/__snapshots__/**",
     "src-win/rntypes/**"
   ],
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "derived",
       "file": ".flowconfig",
       "baseFile": ".flowconfig",
-      "baseHash": "5a5f25ce055b9b4465410b513de9dc6d4db39a90"
+      "baseHash": "f8443da42da65a4f55de1fdcc8e30c3446004ad0"
     },
     {
       "type": "derived",
       "file": "src-win/index.win32.js",
       "baseFile": "packages/react-native/index.js",
-      "baseHash": "a1db6ce79c25843956a583b2dbd34aa11d15da0f"
+      "baseHash": "43b61164095fb1f33793316908d5f974e7c46651"
     },
     {
       "type": "derived",
       "file": "src-win/index.win32.js.flow",
       "baseFile": "packages/react-native/index.js.flow",
-      "baseHash": "6d9f0f7e75b7575870821c3fca5db41ba7e14809"
+      "baseHash": "da9cb1941e2b3d395d157e64a56b71a26396f2bf"
     },
     {
       "type": "platform",
@@ -41,13 +41,13 @@
       "type": "derived",
       "file": "src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts",
       "baseFile": "packages/react-native/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts",
-      "baseHash": "30a3c7351c6a466e2ed95e9b416907ac677d71ca"
+      "baseHash": "34bb1374c3d892607c894ad676de1e5d104ffaae"
     },
     {
       "type": "derived",
       "file": "src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js",
       "baseFile": "packages/react-native/Libraries/Components/AccessibilityInfo/AccessibilityInfo.js",
-      "baseHash": "93b9eb92a1237885cdbff255d473584226421dd3"
+      "baseHash": "86b1d5f06946b43428b2b09351ab6a0cff56a894"
     },
     {
       "type": "copy",
@@ -66,7 +66,7 @@
       "type": "derived",
       "file": "src-win/Libraries/Components/Button.win32.js",
       "baseFile": "packages/react-native/Libraries/Components/Button.js",
-      "baseHash": "26d3afc77f82939021f848eb8185b3b441fb3c7d"
+      "baseHash": "67bb8c4e71cd242d366b3607f4c71f07e70f2488"
     },
     {
       "type": "platform",
@@ -207,7 +207,7 @@
       "type": "patch",
       "file": "src-win/Libraries/Components/View/ViewPropTypes.win32.js",
       "baseFile": "packages/react-native/Libraries/Components/View/ViewPropTypes.js",
-      "baseHash": "d04b64a97b6040611d96b909c41230c1a350ebe6",
+      "baseHash": "2a031cb660382c3ebb74fcbfe71535fa99810cdb",
       "issue": 6240
     },
     {
@@ -431,7 +431,7 @@
       "type": "derived",
       "file": "src-win/Libraries/Text/Text.win32.js",
       "baseFile": "packages/react-native/Libraries/Text/Text.js",
-      "baseHash": "59bf5757acc083a749a38173b3610529b27ef4fb"
+      "baseHash": "d6607b86327891c5920c56ff833a9d984f20533f"
     },
     {
       "type": "derived",
@@ -450,7 +450,7 @@
       "type": "patch",
       "file": "src-win/Libraries/Types/CoreEventTypes.win32.js",
       "baseFile": "packages/react-native/Libraries/Types/CoreEventTypes.js",
-      "baseHash": "ed736df6081d2fbbf54a646b8373bf485449255a",
+      "baseHash": "5834bb306dcf85772546feae7af58a875196d309",
       "issue": 6240
     },
     {
@@ -503,7 +503,7 @@
       "type": "patch",
       "file": "src-win/src/private/animated/NativeAnimatedHelper.win32.js",
       "baseFile": "packages/react-native/src/private/animated/NativeAnimatedHelper.js",
-      "baseHash": "14407780e54e66515159aed1a51cee154b1d5339",
+      "baseHash": "fa2343be98b0eb239a82376cd903f9fef16464f2",
       "issue": 11041
     },
     {
diff --git a/packages/@office-iss/react-native-win32/package.json b/packages/@office-iss/react-native-win32/package.json
index 18b2422f522..5c889c14293 100644
--- a/packages/@office-iss/react-native-win32/package.json
+++ b/packages/@office-iss/react-native-win32/package.json
@@ -30,13 +30,13 @@
     "@react-native-community/cli-platform-android": "20.0.0",
     "@react-native-community/cli-platform-ios": "20.0.0",
     "@react-native/assets": "1.0.0",
-    "@react-native/assets-registry": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/codegen": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/community-cli-plugin": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/gradle-plugin": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/js-polyfills": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/normalize-colors": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/virtualized-lists": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/assets-registry": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/codegen": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/community-cli-plugin": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/gradle-plugin": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/js-polyfills": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/normalize-colors": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/virtualized-lists": "0.84.0-nightly-20251212-dd390dbbe",
     "abort-controller": "^3.0.0",
     "anser": "^1.4.9",
     "ansi-regex": "^5.0.0",
@@ -72,7 +72,7 @@
   "devDependencies": {
     "@babel/core": "^7.25.2",
     "@babel/eslint-parser": "^7.25.1",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/jest-out-of-tree-snapshot-resolver": "^1.1.42",
@@ -89,14 +89,14 @@
     "just-scripts": "^1.3.3",
     "prettier": "2.8.8",
     "react": "19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
     "@types/react": "^19.2.0",
     "react": "^19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc"
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe"
   },
   "beachball": {
     "defaultNpmTag": "canary",
@@ -125,4 +125,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
index cdb508f27a5..5466524d455 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
@@ -150,13 +150,25 @@ export interface AccessibilityInfoStatic {
    * - `announcement`: The string announced by the screen reader.
    * - `options`: An object that configures the reading options.
    *   - `queue`: The announcement will be queued behind existing announcements. iOS only.
+<<<<<<< Upstream
+   *   - `priority`: The priority of the announcement. Possible values: 'low' | 'default' | 'high'.
+   *     High priority announcements will interrupt any ongoing speech and cannot be interrupted.
+   *     Default priority announcements will interrupt any ongoing speech but can be interrupted.
+   *     Low priority announcements will not interrupt ongoing speech and can be interrupted.
+   *     (iOS only).
+=======
    *   - `nativeID`: The nativeID of the element to send the announcement from. win32 only.
+>>>>>>> Override
    */
   announceForAccessibilityWithOptions(
     announcement: string,
     options: {
       queue?: boolean | undefined;
+<<<<<<< Upstream
+      priority?: 'low' | 'default' | 'high' | undefined;
+=======
       nativeID?: string | undefined; // win32
+>>>>>>> Override
     },
   ): void;
 
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
index 9fbd984e4a4..ef091ab72f1 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
@@ -502,6 +502,17 @@ const AccessibilityInfo = {
    * - `announcement`: The string announced by the screen reader.
    * - `options`: An object that configures the reading options.
    *   - `queue`: The announcement will be queued behind existing announcements. iOS only.
+<<<<<<< Upstream
+   *   - `priority`: The priority of the announcement. Possible values: 'low' | 'default' | 'high'.
+   *     High priority announcements will interrupt any ongoing speech and cannot be interrupted.
+   *     Default priority announcements will interrupt any ongoing speech but can be interrupted.
+   *     Low priority announcements will not interrupt ongoing speech and can be interrupted.
+   *     (iOS only).
+   */
+  announceForAccessibilityWithOptions(
+    announcement: string,
+    options: {queue?: boolean, priority?: 'low' | 'default' | 'high'},
+=======
    *   - `nativeID`: The nativeID of the element to send the announcement from. win32 only.
    */
   announceForAccessibilityWithOptions(
@@ -510,6 +521,7 @@ const AccessibilityInfo = {
       queue?: boolean,
       nativeID?: string, // win32
     },
+>>>>>>> Override
   ): void {
     if (Platform.OS === 'android') {
       NativeAccessibilityInfo?.announceForAccessibility(announcement);
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Button.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Button.win32.js
index 12afdda284b..05cf60822f3 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Button.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Button.win32.js
@@ -187,9 +187,6 @@ export type ButtonProps = $ReadOnly<{
   [button:source]:
   https://github.com/facebook/react-native/blob/HEAD/Libraries/Components/Button.js
 
-  [button:examples]:
-  https://js.coach/?menu%5Bcollections%5D=React%20Native&page=1&query=button
-
   ```jsx
   <Button
     onPress={onPressLearnMore}
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
index a1b745d6411..b7e13c043c3 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
@@ -16,6 +16,8 @@ import type {
   BlurEvent,
   FocusEvent,
   GestureResponderEvent,
+  KeyDownEvent,
+  KeyUpEvent,
   LayoutChangeEvent,
   LayoutRectangle,
   MouseEvent,
@@ -116,6 +118,13 @@ type FocusEventProps = $ReadOnly<{
   onFocusCapture?: ?(event: FocusEvent) => void,
 }>;
 
+type KeyEventProps = $ReadOnly<{
+  onKeyDown?: ?(event: KeyDownEvent) => void,
+  onKeyDownCapture?: ?(event: KeyDownEvent) => void,
+  onKeyUp?: ?(event: KeyUpEvent) => void,
+  onKeyUpCapture?: ?(event: KeyUpEvent) => void,
+}>;
+
 type TouchEventProps = $ReadOnly<{
   onTouchCancel?: ?(e: GestureResponderEvent) => void,
   onTouchCancelCapture?: ?(e: GestureResponderEvent) => void,
@@ -587,6 +596,7 @@ export type ViewProps = $ReadOnly<{
   ...MouseEventProps,
   ...PointerEventProps,
   ...FocusEventProps,
+  ...KeyEventProps,
   ...TouchEventProps,
   ...ViewPropsAndroid,
   ...ViewPropsIOS,
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Text/Text.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Text/Text.win32.js
index 8c4346e56c4..bd915aa82e0 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Text/Text.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Text/Text.win32.js
@@ -45,6 +45,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     ref: forwardedRef,
     accessible,
     accessibilityLabel,
+    accessibilityRole,
     accessibilityState,
     allowFontScaling,
     'aria-busy': ariaBusy,
@@ -87,6 +88,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     onResponderTerminationRequest,
     onStartShouldSetResponder,
     pressRetentionOffset,
+    role,
     selectable,
     selectionColor,
     suppressHighlighting,
@@ -186,6 +188,17 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
         onStartShouldSetResponder != null) &&
       _disabled !== true;
 
+    const shouldUseLinkRole =
+      ReactNativeFeatureFlags.shouldUseLinkRoleForPressableText() &&
+      isPressable &&
+      accessibilityRole == null &&
+      role == null;
+
+    const _accessibilityRole =
+      accessibilityRole ?? (shouldUseLinkRole ? 'link' : undefined);
+
+    const _role = shouldUseLinkRole ? undefined : role;
+
     // TODO: Move this processing to the view configuration.
     const _selectionColor =
       selectionColor != null ? processColor(selectionColor) : undefined;
@@ -243,6 +256,9 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     if (_accessibilityLabel !== undefined) {
       processedProps.accessibilityLabel = _accessibilityLabel;
     }
+    if (_accessibilityRole !== undefined) {
+      processedProps.accessibilityRole = _accessibilityRole;
+    }
     if (_accessibilityState !== undefined) {
       processedProps.accessibilityState = _accessibilityState;
     }
@@ -261,6 +277,9 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     if (_selectionColor !== undefined) {
       processedProps.selectionColor = _selectionColor;
     }
+    if (_role !== undefined) {
+      processedProps.role = _role;
+    }
 
     // [Windows accessibility properties
     if (_accessibilityControls !== undefined) {
@@ -378,6 +397,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     accessibilityElementsHidden,
     importantForAccessibility,
     accessibilityLabel,
+    accessibilityRole,
     accessibilityState,
     allowFontScaling,
     'aria-busy': ariaBusy,
@@ -420,6 +440,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     onResponderTerminationRequest,
     onStartShouldSetResponder,
     pressRetentionOffset,
+    role,
     selectable,
     selectionColor,
     suppressHighlighting,
@@ -495,6 +516,17 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
         onStartShouldSetResponder != null) &&
       _disabled !== true;
 
+    const shouldUseLinkRole =
+      ReactNativeFeatureFlags.shouldUseLinkRoleForPressableText() &&
+      isPressable &&
+      accessibilityRole == null &&
+      role == null;
+
+    const _accessibilityRole =
+      accessibilityRole ?? (shouldUseLinkRole ? 'link' : undefined);
+
+    const _role = shouldUseLinkRole ? undefined : role;
+
     // TODO: Move this processing to the view configuration.
     const _selectionColor =
       selectionColor != null ? processColor(selectionColor) : undefined;
@@ -559,6 +591,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
               ...restProps,
               accessibilityElementsHidden: _accessibilityElementsHidden,
               accessibilityLabel: _accessibilityLabel,
+              accessibilityRole: _accessibilityRole,
               accessibilityState: _accessibilityState,
               importantForAccessibility: _importantForAccessibility,
               // #[ Win32
@@ -575,6 +608,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
               selectionColor: _selectionColor,
               style: _style,
               disabled: disabled,
+              role: _role,
               children,
             }}
             textPressabilityProps={{
@@ -600,6 +634,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           {...restProps}
           accessibilityElementsHidden={_accessibilityElementsHidden}
           accessibilityLabel={_accessibilityLabel}
+          accessibilityRole={_accessibilityRole}
           accessibilityState={_accessibilityState}
           importantForAccessibility={_importantForAccessibility}
           // #[ Win32
@@ -616,7 +651,8 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           selectable={_selectable}
           selectionColor={_selectionColor}
           style={_style}
-          disabled={disabled}>
+          disabled={disabled}
+          role={_role}>
           {children}
         </NativeVirtualText>
       );
@@ -651,6 +687,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
             ...restProps,
             accessibilityElementsHidden: _accessibilityElementsHidden,
             accessibilityLabel: _accessibilityLabel,
+            accessibilityRole: _accessibilityRole,
             accessibilityState: _accessibilityState,
             accessible: _accessible,
             allowFontScaling: allowFontScaling !== false,
@@ -662,6 +699,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
             selectable: _selectable,
             selectionColor: _selectionColor,
             style: _style,
+            role: _role,
             children,
           }}
           textPressabilityProps={{
@@ -686,6 +724,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           {...restProps}
           accessibilityElementsHidden={_accessibilityElementsHidden}
           accessibilityLabel={_accessibilityLabel}
+          accessibilityRole={_accessibilityRole}
           accessibilityState={_accessibilityState}
           accessible={_accessible}
           allowFontScaling={allowFontScaling !== false}
@@ -697,7 +736,8 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           ref={forwardedRef}
           selectable={_selectable}
           selectionColor={_selectionColor}
-          style={_style}>
+          style={_style}
+          role={_role}>
           {children}
         </NativeText>
       );
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
index c86e64898c5..632cbd1b798 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
@@ -361,6 +361,39 @@ export type MouseEvent = NativeSyntheticEvent<
     altKey: boolean,
   }>,
 >;
+<<<<<<< Upstream
+
+export type KeyEvent = $ReadOnly<{
+  /**
+   * The actual key that was pressed. For example, F would be "f" or "F" depending on the shift key.
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
+   */
+  key: string,
+  /**
+   * The key code of the key that was pressed. For example, F would be "KeyF"
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code
+   */
+  code: string,
+  altKey: boolean,
+  ctrlKey: boolean,
+  metaKey: boolean,
+  shiftKey: boolean,
+  /**
+   * A boolean value that is true if the given key is being held down such that it is automatically repeating.
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/repeat
+   */
+  repeat?: boolean,
+  /**
+   * Returns a boolean value indicating if the event is fired within a composition session
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent/isComposing
+   */
+  isComposing?: boolean,
+}>;
+
+export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;
+
+export type KeyDownEvent = NativeSyntheticEvent<KeyEvent>;
+=======
 // Windows]
 
 // [Windows
@@ -376,3 +409,4 @@ export type KeyEvent = NativeSyntheticEvent<
   |}>,
 >;
 // Windows]
+>>>>>>> Override
diff --git a/packages/@office-iss/react-native-win32/src-win/index.win32.js b/packages/@office-iss/react-native-win32/src-win/index.win32.js
index 184357ee22f..ff17b4b86d4 100644
--- a/packages/@office-iss/react-native-win32/src-win/index.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/index.win32.js
@@ -344,6 +344,9 @@ module.exports = {
   get useColorScheme() {
     return require('./Libraries/Utilities/useColorScheme').default;
   },
+  get usePressability() {
+    return require('./Libraries/Pressability/usePressability').default;
+  },
   get useWindowDimensions() {
     return require('./Libraries/Utilities/useWindowDimensions').default;
   },
diff --git a/packages/@office-iss/react-native-win32/src-win/index.win32.js.flow b/packages/@office-iss/react-native-win32/src-win/index.win32.js.flow
index ca42a2a3a15..68a26452966 100644
--- a/packages/@office-iss/react-native-win32/src-win/index.win32.js.flow
+++ b/packages/@office-iss/react-native-win32/src-win/index.win32.js.flow
@@ -412,6 +412,11 @@ export * as TurboModuleRegistry from './Libraries/TurboModule/TurboModuleRegistr
 export {default as UIManager} from './Libraries/ReactNative/UIManager';
 export {unstable_batchedUpdates} from './Libraries/ReactNative/RendererProxy';
 export {default as useAnimatedValue} from './Libraries/Animated/useAnimatedValue';
+export type {
+  PressabilityConfig,
+  EventHandlers as PressabilityEventHandlers,
+} from './Libraries/Pressability/Pressability';
+export {default as usePressability} from './Libraries/Pressability/usePressability';
 export {default as useColorScheme} from './Libraries/Utilities/useColorScheme';
 export {default as useWindowDimensions} from './Libraries/Utilities/useWindowDimensions';
 export {default as UTFSequence} from './Libraries/UTFSequence';
@@ -424,6 +429,9 @@ export type {
   BlurEvent,
   FocusEvent,
   GestureResponderEvent,
+  KeyDownEvent,
+  KeyEvent,
+  KeyUpEvent,
   LayoutChangeEvent,
   LayoutRectangle,
   MouseEvent,
diff --git a/packages/@office-iss/react-native-win32/src-win/src/private/animated/NativeAnimatedHelper.win32.js b/packages/@office-iss/react-native-win32/src-win/src/private/animated/NativeAnimatedHelper.win32.js
index 213367dee84..252307df9ba 100644
--- a/packages/@office-iss/react-native-win32/src-win/src/private/animated/NativeAnimatedHelper.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/src/private/animated/NativeAnimatedHelper.win32.js
@@ -17,6 +17,8 @@ import type {
   AnimatedNodeConfig,
   EventMapping,
 } from '../../../Libraries/Animated/NativeAnimatedModule';
+import type {Spec as NativeAnimatedTurboModuleSpec} from '../../../Libraries/Animated/NativeAnimatedTurboModule';
+import type {Node} from '../../../Libraries/Renderer/shims/ReactNativeTypes';
 import type {EventSubscription} from '../../../Libraries/vendor/emitter/EventEmitter';
 
 import NativeAnimatedNonTurboModule from '../../../Libraries/Animated/NativeAnimatedModule';
@@ -28,8 +30,17 @@ import * as ReactNativeFeatureFlags from '../featureflags/ReactNativeFeatureFlag
 import invariant from 'invariant';
 import nullthrows from 'nullthrows';
 
+interface NativeAnimatedModuleSpec extends NativeAnimatedTurboModuleSpec {
+  // connectAnimatedNodeToShadowNodeFamily is available only in NativeAnimatedNonTurboModule
+  +connectAnimatedNodeToShadowNodeFamily?: (
+    nodeTag: number,
+    // $FlowExpectedError[unclear-type].
+    shadowNode: Object,
+  ) => void;
+}
+
 // TODO T69437152 @petetheheat - Delete this fork when Fabric ships to 100%.
-const NativeAnimatedModule: typeof NativeAnimatedTurboModule =
+const NativeAnimatedModule: ?NativeAnimatedModuleSpec =
   NativeAnimatedNonTurboModule ?? NativeAnimatedTurboModule;
 
 let __nativeAnimatedNodeTagCount = 1; /* used for animated nodes */
@@ -84,6 +95,13 @@ function createNativeOperations(): $NonMaybeType<typeof NativeAnimatedModule> {
     'addListener', // 20
     'removeListener', // 21
   ];
+  if (
+    ReactNativeFeatureFlags.cxxNativeAnimatedEnabled() &&
+    //eslint-disable-next-line
+    ReactNativeFeatureFlags.useSharedAnimatedBackend()
+  ) {
+    methodNames.push('connectAnimatedNodeToShadowNodeFamily');
+  }
   const nativeOperations: {
     [$Values<typeof methodNames>]: (...$ReadOnlyArray<mixed>) => void,
   } = {};
@@ -315,6 +333,16 @@ const API = {
     NativeOperations.connectAnimatedNodeToView(nodeTag, viewTag);
   },
 
+  connectAnimatedNodeToShadowNodeFamily(
+    nodeTag: number,
+    shadowNode: Node,
+  ): void {
+    NativeOperations.connectAnimatedNodeToShadowNodeFamily?.(
+      nodeTag,
+      shadowNode,
+    );
+  },
+
   disconnectAnimatedNodeFromView(nodeTag: number, viewTag: number): void {
     NativeOperations.disconnectAnimatedNodeFromView(nodeTag, viewTag);
   },
diff --git a/packages/@react-native-windows/automation-channel/package.json b/packages/@react-native-windows/automation-channel/package.json
index 0b052c1dcd9..ad623ae7c8b 100644
--- a/packages/@react-native-windows/automation-channel/package.json
+++ b/packages/@react-native-windows/automation-channel/package.json
@@ -33,7 +33,7 @@
     "just-scripts": "^1.3.2",
     "prettier": "2.8.8",
     "react": "19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034",
     "typescript": "5.0.4"
   },
diff --git a/packages/@react-native-windows/tester/overrides.json b/packages/@react-native-windows/tester/overrides.json
index a5d272781c6..e2baa1c67c9 100644
--- a/packages/@react-native-windows/tester/overrides.json
+++ b/packages/@react-native-windows/tester/overrides.json
@@ -5,7 +5,7 @@
   "excludePatterns": [
     "src/js/examples-win/**"
   ],
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "copy",
@@ -111,13 +111,13 @@
       "type": "derived",
       "file": "src/js/examples/Text/TextExample.windows.js",
       "baseFile": "packages/rn-tester/js/examples/Text/TextExample.android.js",
-      "baseHash": "87ac08c76abcb9f2f8d3df8990ed6e02d5d4efd9"
+      "baseHash": "6eeabfb642d4f0662ac72dcce58103241819b049"
     },
     {
       "type": "patch",
       "file": "src/js/examples/Text/TextSharedExamples.windows.js",
       "baseFile": "packages/rn-tester/js/examples/Text/TextSharedExamples.js",
-      "baseHash": "da71056f942bf857b29702890d81f65cf49dc17e",
+      "baseHash": "8f78513f2b33c2858552e9c857fbcc3fbf466ec0",
       "issue": 15125
     },
     {
@@ -156,7 +156,7 @@
       "type": "derived",
       "file": "src/js/utils/RNTesterList.windows.js",
       "baseFile": "packages/rn-tester/js/utils/RNTesterList.android.js",
-      "baseHash": "419d588f738d7f9fc252019e74ca7bc92c6a03bf"
+      "baseHash": "21f111f08b53ae5d60a7c03044ae64d867d93dbb"
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/@react-native-windows/tester/package.json b/packages/@react-native-windows/tester/package.json
index 9183479b4da..f1d99ff1bfe 100644
--- a/packages/@react-native-windows/tester/package.json
+++ b/packages/@react-native-windows/tester/package.json
@@ -19,13 +19,13 @@
   "peerDependencies": {
     "@react-native-picker/picker": "2.11.0",
     "react": "19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034",
     "react-native-xaml": "^0.0.80"
   },
   "devDependencies": {
-    "@react-native/new-app-screen": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/tester": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/new-app-screen": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/tester": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/just-task": "2.3.58",
@@ -33,7 +33,7 @@
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
     "just-scripts": "^1.3.3",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
     "react-native-windows": "^0.0.0-canary.1034",
     "typescript": "5.0.4"
@@ -41,4 +41,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/@react-native-windows/tester/src/js/examples/Text/TextExample.windows.js b/packages/@react-native-windows/tester/src/js/examples/Text/TextExample.windows.js
index ddb28ae8c18..12e40a1c3da 100644
--- a/packages/@react-native-windows/tester/src/js/examples/Text/TextExample.windows.js
+++ b/packages/@react-native-windows/tester/src/js/examples/Text/TextExample.windows.js
@@ -1597,6 +1597,10 @@ const examples = [
           <RNTesterText style={{fontStyle: 'normal'}}>
             Move fast and be normal
           </RNTesterText>
+          <RNTesterText style={{fontStyle: 'italic'}}>
+            Move fast and be italic, but just be longer so that you don't fit on
+            a single line and make sure text is not truncated.
+          </RNTesterText>
         </>
       );
     },
diff --git a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
index 9ed9b4a1833..e6258a5c71f 100644
--- a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
+++ b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
@@ -14,7 +14,7 @@ import type {TextLayoutLine} from 'react-native/Libraries/Types/CoreEventTypes';
 import RNTesterText from '../../components/RNTesterText';
 import {useTheme} from '../../components/RNTesterTheme';
 import {useState} from 'react';
-import {View} from 'react-native';
+import {StyleSheet, Text, View} from 'react-native';
 
 function InlineView(props: {
   textAlign: 'auto' | 'left' | 'right' | 'center' | 'justify',
@@ -197,7 +197,54 @@ function RtlAndInlineViewsExample(): React.Node {
   );
 }
 
+<<<<<<< Upstream
+component TextWithLinkRoleExample() {
+  const handlePress = () => console.log('Link Press');
+
+  return (
+    <View>
+      <Text role="link" style={styles.link} onPress={handlePress}>
+        Link Text
+      </Text>
+
+      <Text>
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link
+        </Text>
+      </Text>
+
+      <Text>
+        Before{' '}
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link
+        </Text>
+        {' After'}
+      </Text>
+
+      <Text>
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link 1
+        </Text>
+        {' - '}
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link 2
+        </Text>
+      </Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  link: {
+    color: 'teal',
+    textDecorationLine: 'underline',
+  },
+});
+
+export default [
+=======
 const examples = [
+>>>>>>> Override
   {
     title: 'Empty Text',
     name: 'emptyText',
@@ -226,6 +273,15 @@ const examples = [
     scrollable: true,
     render: NumberOfLinesTextLayoutExample,
   },
+<<<<<<< Upstream
+  {
+    title: 'Text with link role',
+    name: 'textWithLinkRole',
+    description: 'Shows the a11y behavior of Text with role="link"',
+    render: TextWithLinkRoleExample,
+  },
+] as $ReadOnlyArray<RNTesterModuleExample>;
+=======
   // Windows: Only include TextInlineViewsExample in Fabric mode (bridgeless)
   // Paper mode doesn't support Views nested in Text
   ...(global.RN$Bridgeless === true
@@ -244,3 +300,4 @@ const examples = [
 ];
 
 export default examples;
+>>>>>>> Override
diff --git a/packages/@react-native-windows/tester/src/js/utils/RNTesterList.windows.js b/packages/@react-native-windows/tester/src/js/utils/RNTesterList.windows.js
index c9c15047b6c..59c95ec12f9 100644
--- a/packages/@react-native-windows/tester/src/js/utils/RNTesterList.windows.js
+++ b/packages/@react-native-windows/tester/src/js/utils/RNTesterList.windows.js
@@ -66,6 +66,11 @@ const Components: Array<RNTesterModuleInfo> = [
     category: 'UI',
     module: require('../examples-win/Glyph/GlyphExample'),
   },
+  {
+    key: 'KeyEvents',
+    module: require('../examples/KeyboardEventsExample/KeyboardEventsExample')
+      .default,
+  },
   {
     key: 'ModalExample',
     category: 'UI',
@@ -456,11 +461,17 @@ const APIs: Array<RNTesterModuleInfo> = ([
     key: 'LegacyModuleExample',
     module: require('../examples/TurboModule/LegacyModuleExample'),
   },
-  {
-    key: 'TurboCxxModuleExample',
-    category: 'Basic',
-    module: require('../examples/TurboModule/TurboCxxModuleExample'),
-  },
+  // Basic check to detect the availability of the IntersectionObserver API.
+  // $FlowExpectedError[cannot-resolve-name]
+  ...(typeof IntersectionObserver === 'function'
+    ? [
+        {
+          key: 'IntersectionObserver',
+          category: 'UI',
+          module: require('../examples/IntersectionObserver/IntersectionObserverIndex'),
+        },
+      ]
+    : []),
   // Basic check to detect the availability of the modern Performance API.
   ...(typeof performance.getEntries === 'function'
     ? [
diff --git a/packages/@react-native/monorepo/overrides.json b/packages/@react-native/monorepo/overrides.json
index 0056c53d30f..3cdf8ce1c7f 100644
--- a/packages/@react-native/monorepo/overrides.json
+++ b/packages/@react-native/monorepo/overrides.json
@@ -1,11 +1,11 @@
 {
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "patch",
       "file": "package.json",
       "baseFile": "package.json",
-      "baseHash": "f3928d713d62f3d7f52eaf3adcfabb386b926bf1"
+      "baseHash": "3a0c486cfb8ae352e091c1dded040dbf62e2934f"
     }
   ]
 }
\ No newline at end of file
diff --git a/packages/@react-native/monorepo/package.json b/packages/@react-native/monorepo/package.json
index b2cd0f347aa..648923123a6 100644
--- a/packages/@react-native/monorepo/package.json
+++ b/packages/@react-native/monorepo/package.json
@@ -51,8 +51,13 @@
     "@jest/create-cache-key-function": "^29.7.0",
     "@microsoft/api-extractor": "^7.52.2",
     "@octokit/rest": "^22.0.0",
-    "@react-native/metro-babel-transformer": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+<<<<<<< Upstream
+    "@react-native/metro-babel-transformer": "0.84.0-main",
+    "@react-native/metro-config": "0.84.0-main",
+=======
+    "@react-native/metro-babel-transformer": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
+>>>>>>> Override
     "@tsconfig/node22": "22.0.2",
     "@types/react": "^19.2.0",
     "@typescript-eslint/parser": "^8.36.0",
@@ -74,13 +79,12 @@
     "eslint-plugin-jest": "^29.0.1",
     "eslint-plugin-jsx-a11y": "^6.6.0",
     "eslint-plugin-react": "^7.30.1",
-    "eslint-plugin-react-native": "^4.0.0",
+    "eslint-plugin-react-native": "^5.0.0",
     "eslint-plugin-redundant-undefined": "^0.4.0",
     "eslint-plugin-relay": "^1.8.3",
     "fb-dotslash": "0.5.8",
     "flow-api-translator": "0.32.0",
-    "flow-bin": "^0.289.0",
-    "glob": "^7.1.1",
+    "flow-bin": "^0.293.0",
     "hermes-eslint": "0.32.0",
     "hermes-transform": "0.32.0",
     "ini": "^5.0.0",
@@ -110,6 +114,7 @@
     "supports-color": "^7.1.0",
     "temp-dir": "^2.0.0",
     "tinybench": "^4.1.0",
+    "tinyglobby": "^0.2.15",
     "typescript": "5.8.3",
     "ws": "^7.5.10"
   },
diff --git a/packages/@react-native/tester/js/utils/RNTesterList.android.js b/packages/@react-native/tester/js/utils/RNTesterList.android.js
index b3555cd6667..51001fbbb11 100644
--- a/packages/@react-native/tester/js/utils/RNTesterList.android.js
+++ b/packages/@react-native/tester/js/utils/RNTesterList.android.js
@@ -58,6 +58,11 @@ const Components: Array<RNTesterModuleInfo> = [
     key: 'KeyboardAvoidingViewExample',
     module: require('../examples/KeyboardAvoidingView/KeyboardAvoidingViewExample'),
   },
+  {
+    key: 'KeyEvents',
+    module: require('../examples/KeyboardEventsExample/KeyboardEventsExample')
+      .default,
+  },
   {
     key: 'ModalExample',
     category: 'UI',
@@ -363,11 +368,17 @@ const APIs: Array<RNTesterModuleInfo> = ([
     key: 'LegacyModuleExample',
     module: require('../examples/TurboModule/LegacyModuleExample'),
   },
-  {
-    key: 'TurboCxxModuleExample',
-    category: 'Basic',
-    module: require('../examples/TurboModule/TurboCxxModuleExample'),
-  },
+  // Basic check to detect the availability of the IntersectionObserver API.
+  // $FlowExpectedError[cannot-resolve-name]
+  ...(typeof IntersectionObserver === 'function'
+    ? [
+        {
+          key: 'IntersectionObserver',
+          category: 'UI',
+          module: require('../examples/IntersectionObserver/IntersectionObserverIndex'),
+        },
+      ]
+    : []),
   // Basic check to detect the availability of the modern Performance API.
   ...(typeof performance.getEntries === 'function'
     ? [
diff --git a/packages/@react-native/tester/js/utils/RNTesterList.ios.js b/packages/@react-native/tester/js/utils/RNTesterList.ios.js
index 759881e2cc9..342c7e028e1 100644
--- a/packages/@react-native/tester/js/utils/RNTesterList.ios.js
+++ b/packages/@react-native/tester/js/utils/RNTesterList.ios.js
@@ -326,10 +326,6 @@ const APIs: Array<RNTesterModuleInfo> = ([
     key: 'LegacyModuleExample',
     module: require('../examples/TurboModule/LegacyModuleExample'),
   },
-  {
-    key: 'TurboCxxModuleExample',
-    module: require('../examples/TurboModule/TurboCxxModuleExample'),
-  },
   {
     key: 'VibrationExample',
     module: require('../examples/Vibration/VibrationExample'),
@@ -342,6 +338,17 @@ const APIs: Array<RNTesterModuleInfo> = ([
     key: 'XHRExample',
     module: require('../examples/XHR/XHRExample'),
   },
+  // Basic check to detect the availability of the IntersectionObserver API.
+  // $FlowExpectedError[cannot-resolve-name]
+  ...(typeof IntersectionObserver === 'function'
+    ? [
+        {
+          key: 'IntersectionObserver',
+          category: 'UI',
+          module: require('../examples/IntersectionObserver/IntersectionObserverIndex'),
+        },
+      ]
+    : []),
   // Basic check to detect the availability of the modern Performance API.
   ...(typeof performance.getEntries === 'function'
     ? [
diff --git a/packages/@react-native/tester/overrides.json b/packages/@react-native/tester/overrides.json
index 59e8e585085..75dd791e2fe 100644
--- a/packages/@react-native/tester/overrides.json
+++ b/packages/@react-native/tester/overrides.json
@@ -1,5 +1,5 @@
 {
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "copy",
@@ -19,7 +19,7 @@
       "type": "copy",
       "directory": "js/examples/Accessibility",
       "baseDirectory": "packages/rn-tester/js/examples/Accessibility",
-      "baseHash": "86160c9bb592cce9ef577052157e809549fb18d7",
+      "baseHash": "7751eabd9f186b099b05a13cf840314ccb34e349",
       "issue": 4054
     },
     {
@@ -424,7 +424,7 @@
       "type": "copy",
       "directory": "js/examples/Text",
       "baseDirectory": "packages/rn-tester/js/examples/Text",
-      "baseHash": "1190301a021dcd2904b075f382d82169b1f04b91",
+      "baseHash": "ecaa9ebe21567284e104e7155cfabe1d157b09b9",
       "issue": 4054
     },
     {
@@ -508,7 +508,7 @@
       "type": "copy",
       "directory": "js/examples/TurboModule",
       "baseDirectory": "packages/rn-tester/js/examples/TurboModule",
-      "baseHash": "a8bfe0455074efa565db330bf2600e88f69f437b",
+      "baseHash": "382a1f6e29fc70a0ae5903e5a5198c8d4f69c365",
       "issue": 4054
     },
     {
@@ -542,7 +542,7 @@
       "type": "copy",
       "directory": "js/examples/XHR",
       "baseDirectory": "packages/rn-tester/js/examples/XHR",
-      "baseHash": "532af8d0cdedc7cb51ce89a99e566f1687bd4682",
+      "baseHash": "3bc3448654df72f5813b2d256210cb00f1a0ce8f",
       "issue": 4054
     },
     {
@@ -584,14 +584,14 @@
       "type": "copy",
       "file": "js/utils/RNTesterList.android.js",
       "baseFile": "packages/rn-tester/js/utils/RNTesterList.android.js",
-      "baseHash": "419d588f738d7f9fc252019e74ca7bc92c6a03bf",
+      "baseHash": "21f111f08b53ae5d60a7c03044ae64d867d93dbb",
       "issue": 13228
     },
     {
       "type": "copy",
       "file": "js/utils/RNTesterList.ios.js",
       "baseFile": "packages/rn-tester/js/utils/RNTesterList.ios.js",
-      "baseHash": "b164cd5f108ebdeed2fc45512e72ab4d53e6e5ed",
+      "baseHash": "0fceba04a75a75dadb3ba8959388ae4493aabd9c",
       "issue": 13228
     },
     {
@@ -661,7 +661,7 @@
       "type": "patch",
       "file": "package.json",
       "baseFile": "packages/rn-tester/package.json",
-      "baseHash": "022490d028b758a31467e90fb6622cd8021e0592",
+      "baseHash": "f9fdbba3c08eec3656dc42104c47a890ca94e6e6",
       "issue": 13228
     },
     {
diff --git a/packages/@react-native/tester/package.json b/packages/@react-native/tester/package.json
index 55c504f95c4..5be3db623e0 100644
--- a/packages/@react-native/tester/package.json
+++ b/packages/@react-native/tester/package.json
@@ -1,6 +1,10 @@
 {
   "name": "@react-native/tester",
-  "version": "0.83.0-nightly-20251104-502efe1cc",
+<<<<<<< Upstream
+  "version": "0.84.0-main",
+=======
+  "version": "0.84.0-nightly-20251212-dd390dbbe",
+>>>>>>> Override
   "private": true,
   "description": "React Native tester app.",
   "license": "MIT",
@@ -13,10 +17,16 @@
     "node": ">=22"
   },
   "scripts": {
+<<<<<<< Upstream
+    "start": "react-native start",
+    "android": "react-native run-android",
+    "install-android": "../../gradlew :packages:rn-tester:android:app:installDebug",
+=======
     "start": "npx @react-native-community/cli start",
     "android": "npx @react-native-community/cli run-android --mode HermesDebug",
     "install-android-jsc": "../../gradlew :packages:rn-tester:android:app:installJscDebug",
     "install-android-hermes": "../../gradlew :packages:rn-tester:android:app:installHermesDebug",
+>>>>>>> Override
     "clean-android": "rm -rf android/app/build",
     "prepare-ios": "node ./cli.js bootstrap ios",
     "clean-ios": "rm -rf build/generated/ios Pods Podfile.lock",
@@ -26,8 +36,13 @@
     "e2e-test-ios": "./scripts/maestro-test-ios.sh"
   },
   "dependencies": {
-    "@react-native/new-app-screen": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/popup-menu-android": "0.83.0-nightly-20251104-502efe1cc",
+<<<<<<< Upstream
+    "@react-native/new-app-screen": "0.84.0-main",
+    "@react-native/popup-menu-android": "0.84.0-main",
+=======
+    "@react-native/new-app-screen": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/popup-menu-android": "0.84.0-nightly-20251212-dd390dbbe",
+>>>>>>> Override
     "flow-enums-runtime": "^0.0.6",
     "invariant": "^2.2.4",
     "nullthrows": "^1.1.1"
@@ -64,4 +79,4 @@
     "listr2": "^6.4.1",
     "rxjs": "npm:@react-native-community/rxjs@6.5.4-custom"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@rnw-scripts/babel-react-native-config/package.json b/packages/@rnw-scripts/babel-react-native-config/package.json
index f1a036672e7..269cda256e2 100644
--- a/packages/@rnw-scripts/babel-react-native-config/package.json
+++ b/packages/@rnw-scripts/babel-react-native-config/package.json
@@ -11,12 +11,12 @@
   },
   "dependencies": {
     "@babel/core": "^7.25.2",
-    "@react-native/babel-preset": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/babel-preset": "0.84.0-nightly-20251212-dd390dbbe",
     "babel-plugin-transform-flow-enums": "^0.0.2"
   },
   "devDependencies": {
     "@babel/core": "^7.25.2",
-    "@react-native/babel-preset": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/babel-preset": "0.84.0-nightly-20251212-dd390dbbe",
     "eslint": "^8.19.0",
     "prettier": "2.8.8"
   },
diff --git a/packages/@rnw-scripts/eslint-config/package.json b/packages/@rnw-scripts/eslint-config/package.json
index f6e82e13be3..bec290eda0f 100644
--- a/packages/@rnw-scripts/eslint-config/package.json
+++ b/packages/@rnw-scripts/eslint-config/package.json
@@ -13,7 +13,7 @@
     "@babel/core": "^7.25.2",
     "@babel/eslint-parser": "^7.25.1",
     "@microsoft/eslint-plugin-sdl": "^0.2.0",
-    "@react-native/eslint-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/eslint-config": "0.84.0-nightly-20251212-dd390dbbe",
     "eslint-config-prettier": "^8.5.0",
     "eslint-plugin-ft-flow": "^2.0.1",
     "hermes-eslint": "0.23.1"
diff --git a/packages/@rnw-scripts/metro-dev-config/package.json b/packages/@rnw-scripts/metro-dev-config/package.json
index 000a45c2394..1d89ce4598b 100644
--- a/packages/@rnw-scripts/metro-dev-config/package.json
+++ b/packages/@rnw-scripts/metro-dev-config/package.json
@@ -17,7 +17,7 @@
     "lint:fix": "rnw-scripts lint:fix"
   },
   "dependencies": {
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnx-kit/metro-config": "^2.2.3",
     "@rnx-kit/metro-plugin-duplicates-checker": "^3.0.2",
     "@rnx-kit/metro-serializer": "^2.0.3",
diff --git a/packages/e2e-test-app-fabric/package.json b/packages/e2e-test-app-fabric/package.json
index 57f52d2fc5b..0605592bf36 100644
--- a/packages/e2e-test-app-fabric/package.json
+++ b/packages/e2e-test-app-fabric/package.json
@@ -28,7 +28,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "react": "^19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034"
   },
   "devDependencies": {
@@ -39,7 +39,7 @@
     "@babel/runtime": "^7.20.0",
     "@react-native-community/cli": "20.0.0",
     "@react-native-windows/perf-testing": "0.0.0-canary.1033",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native-windows/automation": "0.0.0-canary.1034",
     "@react-native-windows/automation-commands": "0.0.0-canary.1034",
     "@rnw-scripts/babel-node-config": "2.3.3",
@@ -76,4 +76,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/playground/package.json b/packages/playground/package.json
index 26d373dc39b..d0eb5442f96 100644
--- a/packages/playground/package.json
+++ b/packages/playground/package.json
@@ -15,14 +15,14 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "react": "^19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034"
   },
   "devDependencies": {
     "@babel/core": "^7.25.2",
     "@babel/runtime": "^7.20.0",
     "@react-native-community/cli": "20.0.0",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/just-task": "2.3.58",
@@ -52,4 +52,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/sample-app-fabric/package.json b/packages/sample-app-fabric/package.json
index 8b6ab0465e2..062b94620b7 100644
--- a/packages/sample-app-fabric/package.json
+++ b/packages/sample-app-fabric/package.json
@@ -17,7 +17,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "react": "^19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034"
   },
   "devDependencies": {
@@ -28,7 +28,7 @@
     "@babel/runtime": "^7.20.0",
     "@jest/globals": "^29.7.0",
     "@react-native-community/cli": "20.0.0",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-node-config": "2.3.3",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
@@ -49,4 +49,4 @@
   "engines": {
     "node": ">=18"
   }
-}
+}
\ No newline at end of file
diff --git a/packages/sample-custom-component/package.json b/packages/sample-custom-component/package.json
index 05ad4d984b3..5a12021d265 100644
--- a/packages/sample-custom-component/package.json
+++ b/packages/sample-custom-component/package.json
@@ -23,7 +23,7 @@
     "@types/react": "^19.2.0",
     "react": "^19.2.0",
     "minimatch": "^10.0.3",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1034"
   },
   "devDependencies": {
@@ -33,7 +33,7 @@
     "@babel/preset-typescript": "^7.8.3",
     "@babel/runtime": "^7.20.0",
     "@react-native-community/cli": "20.0.0",
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-node-config": "2.3.3",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
@@ -54,4 +54,4 @@
   "engines": {
     "node": ">=18"
   }
-}
+}
\ No newline at end of file
diff --git a/vnext/.flowconfig b/vnext/.flowconfig
index 6d705a48522..53bd4b82ce2 100644
--- a/vnext/.flowconfig
+++ b/vnext/.flowconfig
@@ -138,12 +138,19 @@ module.file_ext=.windows.js
 
 munge_underscores=true
 
+<<<<<<< Upstream
+module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
+module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
+module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
+=======
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/index.windows.js'
 module.name_mapper='^react-native-windows$' -> '<PROJECT_ROOT>/index.windows.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^react-native-windows/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
+>>>>>>> Override
 
 module.system.haste.module_ref_prefix=m#
 
@@ -173,4 +180,4 @@ untyped-import
 untyped-type-import
 
 [version]
-^0.289.0
+^0.293.0
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
index a9e14c6883b..f6afd2a7708 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
@@ -1428,6 +1428,41 @@ TEST_P(JSITest, JSErrorTest) {
       JSIException);
 }
 
+<<<<<<< Upstream
+TEST_P(JSITest, MicrotasksTest) {
+  try {
+    rt.global().setProperty(rt, "globalValue", String::createFromAscii(rt, ""));
+
+    auto microtask1 =
+        function("function microtask1() { globalValue += 'hello'; }");
+    auto microtask2 =
+        function("function microtask2() { globalValue += ' world' }");
+
+    rt.queueMicrotask(microtask1);
+    rt.queueMicrotask(microtask2);
+
+    EXPECT_EQ(
+        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt), "");
+
+    rt.drainMicrotasks();
+
+    EXPECT_EQ(
+        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt),
+        "hello world");
+
+    // Microtasks shouldn't run again
+    rt.drainMicrotasks();
+
+    EXPECT_EQ(
+        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt),
+        "hello world");
+  } catch (const JSINativeException&) {
+    // queueMicrotask() is unimplemented by some runtimes, ignore such failures.
+  }
+}
+
+=======
+>>>>>>> Override
 //----------------------------------------------------------------------
 // Test that multiple levels of delegation in DecoratedHostObjects works.
 
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/nativemodule/core/ReactCommon/TurboModule.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/nativemodule/core/ReactCommon/TurboModule.h
index 2256c0cbfe6..7a7605813cc 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/nativemodule/core/ReactCommon/TurboModule.h
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/nativemodule/core/ReactCommon/TurboModule.h
@@ -38,7 +38,6 @@ enum TurboModuleMethodValueKind {
  */
 TurboModuleMethodValueKind getTurboModuleMethodValueKind(jsi::Runtime &rt, const jsi::Value *value);
 
-class TurboCxxModule;
 class TurboModuleBinding;
 
 /**
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
index a6edeb9ff73..8dbdbbb2325 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
@@ -163,6 +163,13 @@ inline std::string toString(const ImageResizeMode &value)
       return "repeat";
     case ImageResizeMode::None:
       return "none";
+<<<<<<< Upstream
+    default:
+      LOG(ERROR) << "Unsupported ImageResizeMode value: " << (int)value;
+      react_native_expect(false);
+      // "cover" is default in non-Fabric web and iOS
+      return "cover";
+=======
 //#[Windows
 #if defined(_MSC_VER)
     default:
@@ -172,6 +179,7 @@ inline std::string toString(const ImageResizeMode &value)
         __builtin_unreachable();
 #endif
 // 15379 #Windows]
+>>>>>>> Override
   }
 }
 
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h
index bebc79da207..c624d5a430a 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h
@@ -10,6 +10,7 @@
 #include <string>
 #include <vector>
 
+#include <react/debug/react_native_assert.h>
 #include <react/renderer/core/graphicsConversions.h>
 #include <react/renderer/core/propsConversions.h>
 #include <react/renderer/debug/debugStringConvertibleUtils.h>
@@ -48,15 +49,16 @@ class ImageSource {
   {
     folly::dynamic imageSourceResult = folly::dynamic::object();
     switch (type) {
-      case ImageSource::Type::Invalid:
-        imageSourceResult["type"] = "invalid";
-        break;
       case ImageSource::Type::Remote:
         imageSourceResult["type"] = "remote";
         break;
       case ImageSource::Type::Local:
         imageSourceResult["type"] = "local";
         break;
+      case ImageSource::Type::Invalid:
+      default:
+        imageSourceResult["type"] = "invalid";
+        break;
     }
 
     imageSourceResult["uri"] = uri;
@@ -72,9 +74,6 @@ class ImageSource {
     imageSourceResult["method"] = method;
 
     switch (cache) {
-      case ImageSource::CacheStategy::Default:
-        imageSourceResult["cache"] = "default";
-        break;
       case ImageSource::CacheStategy::Reload:
         imageSourceResult["cache"] = "reload";
         break;
@@ -84,6 +83,10 @@ class ImageSource {
       case ImageSource::CacheStategy::OnlyIfCached:
         imageSourceResult["cache"] = "only-if-cached";
         break;
+      case ImageSource::CacheStategy::Default:
+      default:
+        imageSourceResult["cache"] = "default";
+        break;
     }
 
     folly::dynamic headersObject = folly::dynamic::object();
@@ -128,10 +131,16 @@ class ImageSource {
         return "remote";
       case ImageSource::Type::Local:
         return "local";
+<<<<<<< Upstream
+      default:
+        react_native_assert(false && "Invalid ImageSource::Type");
+        return "";
+=======
     //[Windows #15263
     default:
         return "Unknown"; 
         //]
+>>>>>>> Override
     }
   }
 
@@ -146,10 +155,16 @@ class ImageSource {
         return "force-cache";
       case ImageSource::CacheStategy::OnlyIfCached:
         return "only-if-cached";
+<<<<<<< Upstream
+      default:
+        react_native_assert(false && "Invalid ImageSource::CacheStategy");
+        return "";
+=======
         //[Windows #15263
     default:
         return "Unknown"; 
         //]
+>>>>>>> Override
     }
   }
 #endif
diff --git a/vnext/overrides.json b/vnext/overrides.json
index 1ab7c971ea0..fc5d2fb085a 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -8,13 +8,13 @@
     "**/__snapshots__/**",
     "src-win/rntypes/**"
   ],
-  "baseVersion": "0.83.0-nightly-20251104-502efe1cc",
+  "baseVersion": "0.84.0-nightly-20251212-dd390dbbe",
   "overrides": [
     {
       "type": "derived",
       "file": ".flowconfig",
       "baseFile": ".flowconfig",
-      "baseHash": "5a5f25ce055b9b4465410b513de9dc6d4db39a90"
+      "baseHash": "f8443da42da65a4f55de1fdcc8e30c3446004ad0"
     },
     {
       "type": "derived",
@@ -79,7 +79,7 @@
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp",
       "baseFile": "packages/react-native/ReactCommon/jsi/jsi/test/testlib.cpp",
-      "baseHash": "f3e2a444eeafb3d6c16645e29a9cde6cc865ad8d",
+      "baseHash": "9257f8b7e12945db34f9f329850f90174dd8119c",
       "issue": 12210
     },
     {
@@ -121,7 +121,7 @@
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/nativemodule/core/ReactCommon/TurboModule.h",
       "baseFile": "packages/react-native/ReactCommon/react/nativemodule/core/ReactCommon/TurboModule.h",
-      "baseHash": "6819513cd614e77b71e94edbf48dde1a89a120c0",
+      "baseHash": "a37bcf2c24ab4b0a3a1e65d2568625ef8db7429e",
       "issue": 14128
     },
     {
@@ -156,7 +156,7 @@
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h",
       "baseFile": "packages/react-native/ReactCommon/react/renderer/components/image/conversions.h",
-      "baseHash": "89a009bbcea54f0c6acf4479fbc8be7bdde6d4e9",
+      "baseHash": "828baeee90c0961d8b4a2fe85a5611de8a346fad",
       "issue": 15379
     },
     {
@@ -203,27 +203,27 @@
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h",
       "baseFile": "packages/react-native/ReactCommon/react/renderer/imagemanager/primitives.h",
-      "baseHash": "bba2fec2301bbf05f8e47436ad48723c8890e4d7",
+      "baseHash": "46a66e729e744fefab8b0a2a5a8c1d249136b03a",
       "issue": 15263
     },
     {
       "type": "copy",
       "directory": "ReactCopies/IntegrationTests",
       "baseDirectory": "packages/rn-tester/IntegrationTests",
-      "baseHash": "51698ec6c4b199b7fedc5d7accb550a46515b4e7",
+      "baseHash": "1a98afd05e30105137307d2cb5d75bba421d95a8",
       "issue": 4054
     },
     {
       "type": "derived",
       "file": "src-win/index.windows.js",
       "baseFile": "packages/react-native/index.js",
-      "baseHash": "a1db6ce79c25843956a583b2dbd34aa11d15da0f"
+      "baseHash": "43b61164095fb1f33793316908d5f974e7c46651"
     },
     {
       "type": "derived",
       "file": "src-win/index.windows.js.flow",
       "baseFile": "packages/react-native/index.js.flow",
-      "baseHash": "6d9f0f7e75b7575870821c3fca5db41ba7e14809"
+      "baseHash": "da9cb1941e2b3d395d157e64a56b71a26396f2bf"
     },
     {
       "type": "platform",
@@ -298,7 +298,7 @@
       "type": "patch",
       "file": "src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js",
       "baseFile": "packages/react-native/Libraries/Components/AccessibilityInfo/AccessibilityInfo.js",
-      "baseHash": "93b9eb92a1237885cdbff255d473584226421dd3",
+      "baseHash": "86b1d5f06946b43428b2b09351ab6a0cff56a894",
       "issue": 4578
     },
     {
@@ -319,7 +319,7 @@
       "type": "derived",
       "file": "src-win/Libraries/Components/Button.windows.js",
       "baseFile": "packages/react-native/Libraries/Components/Button.js",
-      "baseHash": "26d3afc77f82939021f848eb8185b3b441fb3c7d"
+      "baseHash": "67bb8c4e71cd242d366b3607f4c71f07e70f2488"
     },
     {
       "type": "platform",
@@ -496,7 +496,7 @@
       "type": "patch",
       "file": "src-win/Libraries/Components/View/ViewPropTypes.windows.js",
       "baseFile": "packages/react-native/Libraries/Components/View/ViewPropTypes.js",
-      "baseHash": "d04b64a97b6040611d96b909c41230c1a350ebe6"
+      "baseHash": "2a031cb660382c3ebb74fcbfe71535fa99810cdb"
     },
     {
       "type": "patch",
@@ -634,7 +634,7 @@
       "type": "derived",
       "file": "src-win/Libraries/Text/Text.windows.js",
       "baseFile": "packages/react-native/Libraries/Text/Text.js",
-      "baseHash": "59bf5757acc083a749a38173b3610529b27ef4fb"
+      "baseHash": "d6607b86327891c5920c56ff833a9d984f20533f"
     },
     {
       "type": "derived",
@@ -646,7 +646,7 @@
       "type": "patch",
       "file": "src-win/Libraries/Types/CoreEventTypes.windows.js",
       "baseFile": "packages/react-native/Libraries/Types/CoreEventTypes.js",
-      "baseHash": "ed736df6081d2fbbf54a646b8373bf485449255a"
+      "baseHash": "5834bb306dcf85772546feae7af58a875196d309"
     },
     {
       "type": "copy",
diff --git a/vnext/package.json b/vnext/package.json
index cad8942743e..713d12776b3 100644
--- a/vnext/package.json
+++ b/vnext/package.json
@@ -28,14 +28,14 @@
     "@react-native-community/cli-platform-ios": "20.0.0",
     "@react-native-windows/cli": "0.0.0-canary.285",
     "@react-native/assets": "1.0.0",
-    "@react-native/assets-registry": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/codegen": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/community-cli-plugin": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/gradle-plugin": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/js-polyfills": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/new-app-screen": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/normalize-colors": "0.83.0-nightly-20251104-502efe1cc",
-    "@react-native/virtualized-lists": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/assets-registry": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/codegen": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/community-cli-plugin": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/gradle-plugin": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/js-polyfills": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/new-app-screen": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/normalize-colors": "0.84.0-nightly-20251212-dd390dbbe",
+    "@react-native/virtualized-lists": "0.84.0-nightly-20251212-dd390dbbe",
     "abort-controller": "^3.0.0",
     "anser": "^1.4.9",
     "ansi-regex": "^5.0.0",
@@ -68,7 +68,7 @@
     "yargs": "^17.6.2"
   },
   "devDependencies": {
-    "@react-native/metro-config": "0.83.0-nightly-20251104-502efe1cc",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native-windows/codegen": "0.0.0-canary.131",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
@@ -84,7 +84,7 @@
     "just-scripts": "^1.3.3",
     "prettier": "2.8.8",
     "react": "19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
     "react-refresh": "^0.14.0",
     "typescript": "5.0.4"
@@ -92,7 +92,7 @@
   "peerDependencies": {
     "@types/react": "^19.2.0",
     "react": "^19.2.0",
-    "react-native": "0.83.0-nightly-20251104-502efe1cc"
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe"
   },
   "beachball": {
     "defaultNpmTag": "canary",
@@ -150,4 +150,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
+}
\ No newline at end of file
diff --git a/vnext/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js b/vnext/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js
index b0400c142cf..ee71e0244f0 100644
--- a/vnext/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js
+++ b/vnext/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js
@@ -487,10 +487,15 @@ const AccessibilityInfo = {
    * - `announcement`: The string announced by the screen reader.
    * - `options`: An object that configures the reading options.
    *   - `queue`: The announcement will be queued behind existing announcements. iOS only.
+   *   - `priority`: The priority of the announcement. Possible values: 'low' | 'default' | 'high'.
+   *     High priority announcements will interrupt any ongoing speech and cannot be interrupted.
+   *     Default priority announcements will interrupt any ongoing speech but can be interrupted.
+   *     Low priority announcements will not interrupt ongoing speech and can be interrupted.
+   *     (iOS only).
    */
   announceForAccessibilityWithOptions(
     announcement: string,
-    options: {queue?: boolean},
+    options: {queue?: boolean, priority?: 'low' | 'default' | 'high'},
   ): void {
     if (Platform.OS === 'android' || Platform.OS === 'windows') {
       NativeAccessibilityInfo?.announceForAccessibility(announcement);
diff --git a/vnext/src-win/Libraries/Components/Button.windows.js b/vnext/src-win/Libraries/Components/Button.windows.js
index e5aeb01bd61..3320fe95c70 100644
--- a/vnext/src-win/Libraries/Components/Button.windows.js
+++ b/vnext/src-win/Libraries/Components/Button.windows.js
@@ -209,9 +209,6 @@ export type ButtonProps = $ReadOnly<{
   [button:source]:
   https://github.com/facebook/react-native/blob/HEAD/Libraries/Components/Button.js
 
-  [button:examples]:
-  https://js.coach/?menu%5Bcollections%5D=React%20Native&page=1&query=button
-
   ```jsx
   <Button
     onPress={onPressLearnMore}
diff --git a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
index 3b29bebbf0e..61bff1be17b 100644
--- a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
+++ b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
@@ -15,6 +15,12 @@ import type {ViewStyleProp} from '../../StyleSheet/StyleSheet';
 import type {
   BlurEvent,
   FocusEvent,
+<<<<<<< Upstream
+  GestureResponderEvent,
+  KeyDownEvent,
+  KeyUpEvent,
+=======
+>>>>>>> Override
   LayoutChangeEvent,
   LayoutRectangle,
   MouseEvent,
@@ -116,6 +122,13 @@ type FocusEventProps = $ReadOnly<{
   onFocusCapture?: ?(event: FocusEvent) => void,
 }>;
 
+type KeyEventProps = $ReadOnly<{
+  onKeyDown?: ?(event: KeyDownEvent) => void,
+  onKeyDownCapture?: ?(event: KeyDownEvent) => void,
+  onKeyUp?: ?(event: KeyUpEvent) => void,
+  onKeyUpCapture?: ?(event: KeyUpEvent) => void,
+}>;
+
 type TouchEventProps = $ReadOnly<{
   onTouchCancel?: ?(e: GestureResponderEvent) => void,
   onTouchCancelCapture?: ?(e: GestureResponderEvent) => void,
@@ -577,6 +590,7 @@ export type ViewProps = $ReadOnly<{
   ...MouseEventProps,
   ...PointerEventProps,
   ...FocusEventProps,
+  ...KeyEventProps,
   ...TouchEventProps,
   ...ViewPropsAndroid,
   ...ViewPropsIOS,
diff --git a/vnext/src-win/Libraries/Text/Text.windows.js b/vnext/src-win/Libraries/Text/Text.windows.js
index 381732d96d5..6da31a45a01 100644
--- a/vnext/src-win/Libraries/Text/Text.windows.js
+++ b/vnext/src-win/Libraries/Text/Text.windows.js
@@ -48,6 +48,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     ref: forwardedRef,
     accessible,
     accessibilityLabel,
+    accessibilityRole,
     accessibilityState,
     allowFontScaling,
     'aria-busy': ariaBusy,
@@ -85,6 +86,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     onResponderTerminationRequest,
     onStartShouldSetResponder,
     pressRetentionOffset,
+    role,
     selectable,
     selectionColor,
     suppressHighlighting,
@@ -185,6 +187,17 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
         onStartShouldSetResponder != null) &&
       _disabled !== true;
 
+    const shouldUseLinkRole =
+      ReactNativeFeatureFlags.shouldUseLinkRoleForPressableText() &&
+      isPressable &&
+      accessibilityRole == null &&
+      role == null;
+
+    const _accessibilityRole =
+      accessibilityRole ?? (shouldUseLinkRole ? 'link' : undefined);
+
+    const _role = shouldUseLinkRole ? undefined : role;
+
     // TODO: Move this processing to the view configuration.
     const _selectionColor =
       selectionColor != null ? processColor(selectionColor) : undefined;
@@ -242,6 +255,9 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     if (_accessibilityLabel !== undefined) {
       processedProps.accessibilityLabel = _accessibilityLabel;
     }
+    if (_accessibilityRole !== undefined) {
+      processedProps.accessibilityRole = _accessibilityRole;
+    }
     if (_accessibilityState !== undefined) {
       processedProps.accessibilityState = _accessibilityState;
     }
@@ -260,6 +276,9 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     if (_selectionColor !== undefined) {
       processedProps.selectionColor = _selectionColor;
     }
+    if (_role !== undefined) {
+      processedProps.role = _role;
+    }
 
     // [Windows accessibility properties
     if (ariaLevel !== undefined) {
@@ -365,6 +384,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     accessibilityElementsHidden,
     importantForAccessibility,
     accessibilityLabel,
+    accessibilityRole,
     accessibilityState,
     allowFontScaling,
     'aria-busy': ariaBusy,
@@ -402,6 +422,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
     onResponderTerminationRequest,
     onStartShouldSetResponder,
     pressRetentionOffset,
+    role,
     selectable,
     selectionColor,
     suppressHighlighting,
@@ -478,6 +499,17 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
         onStartShouldSetResponder != null) &&
       _disabled !== true;
 
+    const shouldUseLinkRole =
+      ReactNativeFeatureFlags.shouldUseLinkRoleForPressableText() &&
+      isPressable &&
+      accessibilityRole == null &&
+      role == null;
+
+    const _accessibilityRole =
+      accessibilityRole ?? (shouldUseLinkRole ? 'link' : undefined);
+
+    const _role = shouldUseLinkRole ? undefined : role;
+
     // TODO: Move this processing to the view configuration.
     const _selectionColor =
       selectionColor != null ? processColor(selectionColor) : undefined;
@@ -542,6 +574,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
               ...restProps,
               accessibilityElementsHidden: _accessibilityElementsHidden,
               accessibilityLabel: _accessibilityLabel,
+              accessibilityRole: _accessibilityRole,
               accessibilityState: _accessibilityState,
               importantForAccessibility: _importantForAccessibility,
               // #[Windows
@@ -556,6 +589,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
               selectionColor: _selectionColor,
               style: _style,
               disabled: disabled,
+              role: _role,
               children,
             }}
             textPressabilityProps={{
@@ -581,6 +615,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           {...restProps}
           accessibilityElementsHidden={_accessibilityElementsHidden}
           accessibilityLabel={_accessibilityLabel}
+          accessibilityRole={_accessibilityRole}
           accessibilityState={_accessibilityState}
           importantForAccessibility={_importantForAccessibility}
           nativeID={_nativeID}
@@ -589,7 +624,8 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           selectable={_selectable}
           selectionColor={_selectionColor}
           style={_style}
-          disabled={disabled}>
+          disabled={disabled}
+          role={_role}>
           {children}
         </NativeVirtualText>
       );
@@ -624,6 +660,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
             ...restProps,
             accessibilityElementsHidden: _accessibilityElementsHidden,
             accessibilityLabel: _accessibilityLabel,
+            accessibilityRole: _accessibilityRole,
             accessibilityState: _accessibilityState,
             accessible: _accessible,
             allowFontScaling: allowFontScaling !== false,
@@ -635,6 +672,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
             selectable: _selectable,
             selectionColor: _selectionColor,
             style: _style,
+            role: _role,
             children,
           }}
           textPressabilityProps={{
@@ -659,6 +697,7 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           {...restProps}
           accessibilityElementsHidden={_accessibilityElementsHidden}
           accessibilityLabel={_accessibilityLabel}
+          accessibilityRole={_accessibilityRole}
           accessibilityState={_accessibilityState}
           // #[Windows
           accessibilityLevel={_accessibilityLevel} // Windows
@@ -675,7 +714,8 @@ if (ReactNativeFeatureFlags.reduceDefaultPropsInText()) {
           ref={forwardedRef}
           selectable={_selectable}
           selectionColor={_selectionColor}
-          style={_style}>
+          style={_style}
+          role={_role}>
           {children}
         </NativeText>
       );
diff --git a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
index 8c743f8a873..7b2fa418f00 100644
--- a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
+++ b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
@@ -369,4 +369,38 @@ export type KeyEvent = NativeSyntheticEvent<
     eventPhase: number,
   }>,
 >;
+<<<<<<< Upstream
+
+export type KeyEvent = $ReadOnly<{
+  /**
+   * The actual key that was pressed. For example, F would be "f" or "F" depending on the shift key.
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/key
+   */
+  key: string,
+  /**
+   * The key code of the key that was pressed. For example, F would be "KeyF"
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/code
+   */
+  code: string,
+  altKey: boolean,
+  ctrlKey: boolean,
+  metaKey: boolean,
+  shiftKey: boolean,
+  /**
+   * A boolean value that is true if the given key is being held down such that it is automatically repeating.
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/repeat
+   */
+  repeat?: boolean,
+  /**
+   * Returns a boolean value indicating if the event is fired within a composition session
+   * @see https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent/isComposing
+   */
+  isComposing?: boolean,
+}>;
+
+export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;
+
+export type KeyDownEvent = NativeSyntheticEvent<KeyEvent>;
+=======
 // Windows]
+>>>>>>> Override
diff --git a/vnext/src-win/index.windows.js b/vnext/src-win/index.windows.js
index ad9dfc32f8f..7c036a82925 100644
--- a/vnext/src-win/index.windows.js
+++ b/vnext/src-win/index.windows.js
@@ -341,6 +341,9 @@ module.exports = {
   get useColorScheme() {
     return require('./Libraries/Utilities/useColorScheme').default;
   },
+  get usePressability() {
+    return require('./Libraries/Pressability/usePressability').default;
+  },
   get useWindowDimensions() {
     return require('./Libraries/Utilities/useWindowDimensions').default;
   },
diff --git a/vnext/src-win/index.windows.js.flow b/vnext/src-win/index.windows.js.flow
index f7525a51438..1e439e0be24 100644
--- a/vnext/src-win/index.windows.js.flow
+++ b/vnext/src-win/index.windows.js.flow
@@ -408,6 +408,11 @@ export * as TurboModuleRegistry from './Libraries/TurboModule/TurboModuleRegistr
 export {default as UIManager} from './Libraries/ReactNative/UIManager';
 export {unstable_batchedUpdates} from './Libraries/ReactNative/RendererProxy';
 export {default as useAnimatedValue} from './Libraries/Animated/useAnimatedValue';
+export type {
+  PressabilityConfig,
+  EventHandlers as PressabilityEventHandlers,
+} from './Libraries/Pressability/Pressability';
+export {default as usePressability} from './Libraries/Pressability/usePressability';
 export {default as useColorScheme} from './Libraries/Utilities/useColorScheme';
 export {default as useWindowDimensions} from './Libraries/Utilities/useWindowDimensions';
 export {default as UTFSequence} from './Libraries/UTFSequence';
@@ -420,6 +425,9 @@ export type {
   BlurEvent,
   FocusEvent,
   GestureResponderEvent,
+  KeyDownEvent,
+  KeyEvent,
+  KeyUpEvent,
   LayoutChangeEvent,
   LayoutRectangle,
   MouseEvent,
diff --git a/yarn.lock b/yarn.lock
index 362a5dc8dd0..110fd11dd2b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2573,6 +2573,11 @@
   resolved "https://registry.yarnpkg.com/@react-native/assets-registry/-/assets-registry-0.83.0-nightly-20251104-502efe1cc.tgz#8f4d5f45b1d624e8dc373435b6187d00feedfe57"
   integrity sha512-qMZIX+5xyEGHwcn45OBpSnXdLl9YIq7byy32SmEfvd2ywe4zv6RYCyjf0T6ecfafyCo+ZPAV1q/HdWgw67qYww==
 
+"@react-native/assets-registry@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/assets-registry/-/assets-registry-0.84.0-nightly-20251212-dd390dbbe.tgz#fe6376ba287256a3735706c278ed9cc08eb6f2a0"
+  integrity sha512-Fut5di9BK9kUsI0WAKsPzC3PdaQcSMRPgl2fucnSSOh/ROOymEP90qy2aPoAQvqz+VyXPWeQ9mlSXsN/kMNvww==
+
 "@react-native/assets@1.0.0":
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/@react-native/assets/-/assets-1.0.0.tgz#c6f9bf63d274bafc8e970628de24986b30a55c8e"
@@ -2650,6 +2655,19 @@
     nullthrows "^1.1.1"
     yargs "^17.6.2"
 
+"@react-native/codegen@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/codegen/-/codegen-0.84.0-nightly-20251212-dd390dbbe.tgz#e84347d1b49b74bffc2b8c32be0c4c755e11ed1b"
+  integrity sha512-dTJv9+HA253feQiCQrcHK7c5XZg9q6XrpBv8tq3+Kex9+TXWeA9MJ2wmiim4sfcviElc1K9jsTTQVJOqqrPiLw==
+  dependencies:
+    "@babel/core" "^7.25.2"
+    "@babel/parser" "^7.25.3"
+    hermes-parser "0.32.0"
+    invariant "^2.2.4"
+    nullthrows "^1.1.1"
+    tinyglobby "^0.2.15"
+    yargs "^17.6.2"
+
 "@react-native/community-cli-plugin@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/community-cli-plugin/-/community-cli-plugin-0.83.0-nightly-20251104-502efe1cc.tgz#2f4c30c9bbdd8b9b4930a194deef4f1c7ca17e11"
@@ -2663,11 +2681,29 @@
     metro-core "^0.83.3"
     semver "^7.1.3"
 
+"@react-native/community-cli-plugin@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/community-cli-plugin/-/community-cli-plugin-0.84.0-nightly-20251212-dd390dbbe.tgz#246a47f55b302a219739ecae01e13bbde431e4f9"
+  integrity sha512-rPGKhSmMUZXAdlzcPpjjA0E8/z9Cm2mt4yi89kmR2lmngbPbqYLyqD+AK7NQv6fx1zOaPDozwbXyOWi0i97FLA==
+  dependencies:
+    "@react-native/dev-middleware" "0.84.0-nightly-20251212-dd390dbbe"
+    debug "^4.4.0"
+    invariant "^2.2.4"
+    metro "^0.83.3"
+    metro-config "^0.83.3"
+    metro-core "^0.83.3"
+    semver "^7.1.3"
+
 "@react-native/debugger-frontend@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/debugger-frontend/-/debugger-frontend-0.83.0-nightly-20251104-502efe1cc.tgz#0453bf2eb3c40c296b6ade448794ce29e6b1aa60"
   integrity sha512-YyAC8vJTuxg2bVhQij6zNKH+qcHpn+3S0cK72Fyapgh96BdwG6Lr4upAYqQJnI+8rA8Ram/BUchDqkT2HWEcBA==
 
+"@react-native/debugger-frontend@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/debugger-frontend/-/debugger-frontend-0.84.0-nightly-20251212-dd390dbbe.tgz#692659de33d40399f558bc78265f683e85dee4ae"
+  integrity sha512-w/Zoh3GbTzcAJWm1Lx+B3ynWL620TNwzaMyGwFTWnjE0bcWiKXVMQlZ7b28Nf0deDxg8vOaJ13ysFf1WTwpR+A==
+
 "@react-native/debugger-shell@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/debugger-shell/-/debugger-shell-0.83.0-nightly-20251104-502efe1cc.tgz#980416fba85bfb8ab1eb8fac45336c11e84b0e3c"
@@ -2676,6 +2712,14 @@
     cross-spawn "^7.0.6"
     fb-dotslash "0.5.8"
 
+"@react-native/debugger-shell@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/debugger-shell/-/debugger-shell-0.84.0-nightly-20251212-dd390dbbe.tgz#05f74f2d5d83e4490680ef750e52adbaffceff1d"
+  integrity sha512-JjYZD2yRBISeqRdMs3CbKP4HFfUWylkUSHYzxrH228yc7NhrmEDOXnrq1DSxv9TsMpzaKRNMzNbBCgMPpNzTDg==
+  dependencies:
+    cross-spawn "^7.0.6"
+    fb-dotslash "0.5.8"
+
 "@react-native/dev-middleware@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/dev-middleware/-/dev-middleware-0.83.0-nightly-20251104-502efe1cc.tgz#f46dad915f30c4ff7b355175379ae890101dcead"
@@ -2694,6 +2738,24 @@
     serve-static "^1.16.2"
     ws "^7.5.10"
 
+"@react-native/dev-middleware@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/dev-middleware/-/dev-middleware-0.84.0-nightly-20251212-dd390dbbe.tgz#feefbd59562d96423a1ab13542217c70c47e2308"
+  integrity sha512-H1zp7vMdEr1m0dqoOXrtKOVp0j4onUQLHEeobT3qbf1afjBTnOnNQSSXAW5zOcXtm/qCILvob02XJefjhJ8xDw==
+  dependencies:
+    "@isaacs/ttlcache" "^1.4.1"
+    "@react-native/debugger-frontend" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/debugger-shell" "0.84.0-nightly-20251212-dd390dbbe"
+    chrome-launcher "^0.15.2"
+    chromium-edge-launcher "^0.2.0"
+    connect "^3.6.5"
+    debug "^4.4.0"
+    invariant "^2.2.4"
+    nullthrows "^1.1.1"
+    open "^7.0.3"
+    serve-static "^1.16.2"
+    ws "^7.5.10"
+
 "@react-native/eslint-config@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/eslint-config/-/eslint-config-0.83.0-nightly-20251104-502efe1cc.tgz#59bddce6ff9c38084fa2867df097b8f915ad2975"
@@ -2722,11 +2784,21 @@
   resolved "https://registry.yarnpkg.com/@react-native/gradle-plugin/-/gradle-plugin-0.83.0-nightly-20251104-502efe1cc.tgz#f91846863f98506c7f260eed66ec2bffa10d5082"
   integrity sha512-B++pfoh0/I+PHS9xCF9jFB2wV1i2PlyQ0fbeUpGg90hiM+DVmFdWbtvVGh3NGQsuelPbeuCxNizjdklYcXawVg==
 
+"@react-native/gradle-plugin@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/gradle-plugin/-/gradle-plugin-0.84.0-nightly-20251212-dd390dbbe.tgz#7af4251c768b4c0285821d696632610ba7ec4b4a"
+  integrity sha512-3FAakCive56vgIh61idX2qhDU1Gvhp793uE/cOyjWbYlZelpG89HLoS7YUSlvxhrR8nqOKuQ2AkooqJMNjwoWw==
+
 "@react-native/js-polyfills@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/js-polyfills/-/js-polyfills-0.83.0-nightly-20251104-502efe1cc.tgz#f388af658bf8586c9d7d48d5d6201ebcbe7bd83f"
   integrity sha512-O4a0C1H5BU7h30xb72x4+8XLu3vEId07UCkMk5Hfwts3eANarKOajD8tCk9Abo5eN13S4AmYvn00+DZ1in+/Vw==
 
+"@react-native/js-polyfills@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/js-polyfills/-/js-polyfills-0.84.0-nightly-20251212-dd390dbbe.tgz#b7854810b9c2cda2e2f79eb0b14de3b2a2de3ecc"
+  integrity sha512-2CbRod1/QoEKZQ55H8LowsDqS0vZkd84sLckWfPC7wQkFOD6IJcKVgz0ubuqlAtdH/pY2fNwqevwBAOhDSg5rA==
+
 "@react-native/metro-babel-transformer@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/metro-babel-transformer/-/metro-babel-transformer-0.83.0-nightly-20251104-502efe1cc.tgz#1a7a4ac382203add3d56905b2d90f6f6d26baf4d"
@@ -2762,6 +2834,11 @@
   resolved "https://registry.yarnpkg.com/@react-native/normalize-colors/-/normalize-colors-0.83.0-nightly-20251104-502efe1cc.tgz#60be84b59e60cf43d95db29f4793a09952e95828"
   integrity sha512-LVJuk+/CA5TpzCLkFQP6klKjnSRG0mNv1O5C7pLFSBDfChpkbTuZBow07GcHR0lkha71vFQDsMTaMsDhbCJSDw==
 
+"@react-native/normalize-colors@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/normalize-colors/-/normalize-colors-0.84.0-nightly-20251212-dd390dbbe.tgz#d265c1974ef01e72b684a03a75ac28e376bf156f"
+  integrity sha512-TfcO68100H/EA+j3io5v0JZM0fun7W52hdHvmTo3nWYRl+olCjs3QRyEGVb8KgHbTbKs/N1F9oCQZEFLwL40yQ==
+
 "@react-native/popup-menu-android@0.83.0-nightly-20251104-502efe1cc":
   version "0.83.0-nightly-20251104-502efe1cc"
   resolved "https://registry.yarnpkg.com/@react-native/popup-menu-android/-/popup-menu-android-0.83.0-nightly-20251104-502efe1cc.tgz#e213f8a1d27caa46dce3620a56642a4c26ee8762"
@@ -2777,6 +2854,14 @@
     invariant "^2.2.4"
     nullthrows "^1.1.1"
 
+"@react-native/virtualized-lists@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/virtualized-lists/-/virtualized-lists-0.84.0-nightly-20251212-dd390dbbe.tgz#f41612b952c91dc5b36b5d50b5a39190a5a646f0"
+  integrity sha512-/s+Of6Y9eM6ako571LUQhU005iWlNmp9jSxIEgedl+8L/NYg3sMEoP/kJYJkM1JB3LCN9unRJv7IU/0/iduLRQ==
+  dependencies:
+    invariant "^2.2.4"
+    nullthrows "^1.1.1"
+
 "@rnx-kit/align-deps@^3.4.2":
   version "3.4.2"
   resolved "https://registry.yarnpkg.com/@rnx-kit/align-deps/-/align-deps-3.4.2.tgz#85d0e9c5e4854e6e568c239c2088675f0c3f4105"
@@ -7316,10 +7401,10 @@ hasown@^2.0.2:
   dependencies:
     function-bind "^1.1.2"
 
-hermes-compiler@0.14.0-commitly-202511031701-9c948b8c9:
-  version "0.14.0-commitly-202511031701-9c948b8c9"
-  resolved "https://registry.yarnpkg.com/hermes-compiler/-/hermes-compiler-0.14.0-commitly-202511031701-9c948b8c9.tgz#fffa4492cc69be1daa6f4e5b34c76dce82e8f491"
-  integrity sha512-7/cVEpC/cPJnmpQXXmHnY2EREmEuJvypOn1xbgSM3duhju+f/utcWvF86N3Nue6x/XzECML/X3bLO/SKjNn6BQ==
+hermes-compiler@0.14.0-commitly-202512102158-39fca9fda:
+  version "0.14.0-commitly-202512102158-39fca9fda"
+  resolved "https://registry.yarnpkg.com/hermes-compiler/-/hermes-compiler-0.14.0-commitly-202512102158-39fca9fda.tgz#19a7a50c768a2f91f7e04b10937e151599efe37b"
+  integrity sha512-gi136ckWTuS3NdyO3G4bvyhKrmIAwz7mPmxSDdWcp585+1CZBpapZJufHnqNok7I9Yp0PoH9ebkH3BhmqbDVDQ==
 
 hermes-eslint@0.23.1:
   version "0.23.1"
@@ -11111,19 +11196,19 @@ react-native-platform-override@0.0.0-canary.1017:
     upath "^1.2.0"
     yargs "^16.2.0"
 
-react-native@0.83.0-nightly-20251104-502efe1cc:
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/react-native/-/react-native-0.83.0-nightly-20251104-502efe1cc.tgz#9f0ff8e318ffe55d167ceac84d1060619fd17e08"
-  integrity sha512-spKOs7iiXkgtzJsGQvTLLbSUfv4iFKK0/d7Bayuohm9ahW9urbFXX27Yk4uC4yG3Pc3/zHduk6+wxEe1A6XYRQ==
+react-native@0.84.0-nightly-20251212-dd390dbbe:
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/react-native/-/react-native-0.84.0-nightly-20251212-dd390dbbe.tgz#d997217c99bf48acdfe10906388bee961cb42468"
+  integrity sha512-2VTnJX3hHbOAet7/7yAE/+clb8GCVK+zDzMIsykzqT4B1sabhr0z0LFIsR5Kf4MWKkqONSHrDBSQhd+JjoorsA==
   dependencies:
     "@jest/create-cache-key-function" "^29.7.0"
-    "@react-native/assets-registry" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/codegen" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/community-cli-plugin" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/gradle-plugin" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/js-polyfills" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/normalize-colors" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/virtualized-lists" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/assets-registry" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/codegen" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/community-cli-plugin" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/gradle-plugin" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/js-polyfills" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/normalize-colors" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/virtualized-lists" "0.84.0-nightly-20251212-dd390dbbe"
     abort-controller "^3.0.0"
     anser "^1.4.9"
     ansi-regex "^5.0.0"
@@ -11132,8 +11217,7 @@ react-native@0.83.0-nightly-20251104-502efe1cc:
     base64-js "^1.5.1"
     commander "^12.0.0"
     flow-enums-runtime "^0.0.6"
-    glob "^7.1.1"
-    hermes-compiler "0.14.0-commitly-202511031701-9c948b8c9"
+    hermes-compiler "0.14.0-commitly-202512102158-39fca9fda"
     invariant "^2.2.4"
     jest-environment-node "^29.7.0"
     memoize-one "^5.0.0"
@@ -11148,6 +11232,7 @@ react-native@0.83.0-nightly-20251104-502efe1cc:
     scheduler "0.27.0"
     semver "^7.1.3"
     stacktrace-parser "^0.1.10"
+    tinyglobby "^0.2.15"
     whatwg-fetch "^3.0.0"
     ws "^7.5.10"
     yargs "^17.6.2"

From 18c143ad69fd733aad37095b626bfc06cb4cd9d7 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Fri, 13 Mar 2026 14:26:47 +0530
Subject: [PATCH 03/14] Resolve Conflicts

---
 .../src/js/utils/RNTesterList.win32.js        |   3 -
 .../react-native-win32/.flowconfig            |   9 +-
 .../AccessibilityInfo/AccessibilityInfo.d.ts  |   6 -
 .../AccessibilityInfo.win32.js                |   8 +-
 .../Libraries/Types/CoreEventTypes.win32.js   |   6 +-
 .../Text/TextSharedExamples.windows.js        |   8 -
 packages/@react-native/monorepo/package.json  |   5 -
 packages/@react-native/tester/package.json    |  18 +-
 .../jsi/jsi/test/testlib.cpp                  |  35 ----
 .../renderer/components/image/conversions.h   | 186 ----------------
 .../react/renderer/imagemanager/primitives.h  | 198 ------------------
 vnext/overrides.json                          |  14 --
 .../Components/View/ViewPropTypes.windows.js  |   4 -
 .../Libraries/Types/CoreEventTypes.windows.js |   6 +-
 14 files changed, 5 insertions(+), 501 deletions(-)
 delete mode 100644 vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
 delete mode 100644 vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h

diff --git a/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js b/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
index c6fa1406f4d..d9c5c9608d4 100644
--- a/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
+++ b/packages/@office-iss/react-native-win32-tester/src/js/utils/RNTesterList.win32.js
@@ -79,7 +79,6 @@ const Components: Array<RNTesterModuleInfo> = [
     module: require('../examples/KeyboardAvoidingView/KeyboardAvoidingViewExample'),
   },
   {
-<<<<<<< Upstream
     key: 'KeyEvents',
     module: require('../examples/KeyboardEventsExample/KeyboardEventsExample')
       .default,
@@ -90,8 +89,6 @@ const Components: Array<RNTesterModuleInfo> = [
     module: require('../examples/Modal/ModalExample'),
   },
   {
-=======
->>>>>>> Override
     key: 'NewAppScreenExample',
     module: require('../examples/NewAppScreen/NewAppScreenExample'),
   },
diff --git a/packages/@office-iss/react-native-win32/.flowconfig b/packages/@office-iss/react-native-win32/.flowconfig
index ab424ccae65..1ac0ebdeaa7 100644
--- a/packages/@office-iss/react-native-win32/.flowconfig
+++ b/packages/@office-iss/react-native-win32/.flowconfig
@@ -139,19 +139,12 @@ module.file_ext=.win32.js
 
 munge_underscores=true
 
-<<<<<<< Upstream
-module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
-module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
-module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
-module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
-=======
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/index.win32.js'
 module.name_mapper='^@office-iss/react-native-win32$' -> '<PROJECT_ROOT>/index.win32.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@office-iss/react-native-win32/\(.*\)$' -> '<PROJECT_ROOT>\/1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/\1'
-module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
->>>>>>> Override
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
 
 module.system.haste.module_ref_prefix=m#
 
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
index 5466524d455..d33050d8a2d 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.d.ts
@@ -150,25 +150,19 @@ export interface AccessibilityInfoStatic {
    * - `announcement`: The string announced by the screen reader.
    * - `options`: An object that configures the reading options.
    *   - `queue`: The announcement will be queued behind existing announcements. iOS only.
-<<<<<<< Upstream
    *   - `priority`: The priority of the announcement. Possible values: 'low' | 'default' | 'high'.
    *     High priority announcements will interrupt any ongoing speech and cannot be interrupted.
    *     Default priority announcements will interrupt any ongoing speech but can be interrupted.
    *     Low priority announcements will not interrupt ongoing speech and can be interrupted.
    *     (iOS only).
-=======
    *   - `nativeID`: The nativeID of the element to send the announcement from. win32 only.
->>>>>>> Override
    */
   announceForAccessibilityWithOptions(
     announcement: string,
     options: {
       queue?: boolean | undefined;
-<<<<<<< Upstream
       priority?: 'low' | 'default' | 'high' | undefined;
-=======
       nativeID?: string | undefined; // win32
->>>>>>> Override
     },
   ): void;
 
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
index ef091ab72f1..65b0abc565c 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
@@ -502,26 +502,20 @@ const AccessibilityInfo = {
    * - `announcement`: The string announced by the screen reader.
    * - `options`: An object that configures the reading options.
    *   - `queue`: The announcement will be queued behind existing announcements. iOS only.
-<<<<<<< Upstream
    *   - `priority`: The priority of the announcement. Possible values: 'low' | 'default' | 'high'.
    *     High priority announcements will interrupt any ongoing speech and cannot be interrupted.
    *     Default priority announcements will interrupt any ongoing speech but can be interrupted.
    *     Low priority announcements will not interrupt ongoing speech and can be interrupted.
    *     (iOS only).
-   */
-  announceForAccessibilityWithOptions(
-    announcement: string,
-    options: {queue?: boolean, priority?: 'low' | 'default' | 'high'},
-=======
    *   - `nativeID`: The nativeID of the element to send the announcement from. win32 only.
    */
   announceForAccessibilityWithOptions(
     announcement: string,
     options: {
       queue?: boolean,
+      priority?: 'low' | 'default' | 'high',
       nativeID?: string, // win32
     },
->>>>>>> Override
   ): void {
     if (Platform.OS === 'android') {
       NativeAccessibilityInfo?.announceForAccessibility(announcement);
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
index 632cbd1b798..c00625bb07b 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
@@ -361,8 +361,7 @@ export type MouseEvent = NativeSyntheticEvent<
     altKey: boolean,
   }>,
 >;
-<<<<<<< Upstream
-
+// Windows]
 export type KeyEvent = $ReadOnly<{
   /**
    * The actual key that was pressed. For example, F would be "f" or "F" depending on the shift key.
@@ -393,8 +392,6 @@ export type KeyEvent = $ReadOnly<{
 export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;
 
 export type KeyDownEvent = NativeSyntheticEvent<KeyEvent>;
-=======
-// Windows]
 
 // [Windows
 export type KeyEvent = NativeSyntheticEvent<
@@ -409,4 +406,3 @@ export type KeyEvent = NativeSyntheticEvent<
   |}>,
 >;
 // Windows]
->>>>>>> Override
diff --git a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
index e6258a5c71f..68f85a2ce60 100644
--- a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
+++ b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
@@ -197,7 +197,6 @@ function RtlAndInlineViewsExample(): React.Node {
   );
 }
 
-<<<<<<< Upstream
 component TextWithLinkRoleExample() {
   const handlePress = () => console.log('Link Press');
 
@@ -241,10 +240,7 @@ const styles = StyleSheet.create({
   },
 });
 
-export default [
-=======
 const examples = [
->>>>>>> Override
   {
     title: 'Empty Text',
     name: 'emptyText',
@@ -273,15 +269,12 @@ const examples = [
     scrollable: true,
     render: NumberOfLinesTextLayoutExample,
   },
-<<<<<<< Upstream
   {
     title: 'Text with link role',
     name: 'textWithLinkRole',
     description: 'Shows the a11y behavior of Text with role="link"',
     render: TextWithLinkRoleExample,
   },
-] as $ReadOnlyArray<RNTesterModuleExample>;
-=======
   // Windows: Only include TextInlineViewsExample in Fabric mode (bridgeless)
   // Paper mode doesn't support Views nested in Text
   ...(global.RN$Bridgeless === true
@@ -300,4 +293,3 @@ const examples = [
 ];
 
 export default examples;
->>>>>>> Override
diff --git a/packages/@react-native/monorepo/package.json b/packages/@react-native/monorepo/package.json
index 648923123a6..6918d4da60e 100644
--- a/packages/@react-native/monorepo/package.json
+++ b/packages/@react-native/monorepo/package.json
@@ -51,13 +51,8 @@
     "@jest/create-cache-key-function": "^29.7.0",
     "@microsoft/api-extractor": "^7.52.2",
     "@octokit/rest": "^22.0.0",
-<<<<<<< Upstream
-    "@react-native/metro-babel-transformer": "0.84.0-main",
-    "@react-native/metro-config": "0.84.0-main",
-=======
     "@react-native/metro-babel-transformer": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
->>>>>>> Override
     "@tsconfig/node22": "22.0.2",
     "@types/react": "^19.2.0",
     "@typescript-eslint/parser": "^8.36.0",
diff --git a/packages/@react-native/tester/package.json b/packages/@react-native/tester/package.json
index 5be3db623e0..ea393cd0f02 100644
--- a/packages/@react-native/tester/package.json
+++ b/packages/@react-native/tester/package.json
@@ -1,10 +1,6 @@
 {
   "name": "@react-native/tester",
-<<<<<<< Upstream
-  "version": "0.84.0-main",
-=======
   "version": "0.84.0-nightly-20251212-dd390dbbe",
->>>>>>> Override
   "private": true,
   "description": "React Native tester app.",
   "license": "MIT",
@@ -17,16 +13,9 @@
     "node": ">=22"
   },
   "scripts": {
-<<<<<<< Upstream
-    "start": "react-native start",
-    "android": "react-native run-android",
-    "install-android": "../../gradlew :packages:rn-tester:android:app:installDebug",
-=======
     "start": "npx @react-native-community/cli start",
     "android": "npx @react-native-community/cli run-android --mode HermesDebug",
-    "install-android-jsc": "../../gradlew :packages:rn-tester:android:app:installJscDebug",
-    "install-android-hermes": "../../gradlew :packages:rn-tester:android:app:installHermesDebug",
->>>>>>> Override
+    "install-android": "../../gradlew :packages:rn-tester:android:app:installDebug",
     "clean-android": "rm -rf android/app/build",
     "prepare-ios": "node ./cli.js bootstrap ios",
     "clean-ios": "rm -rf build/generated/ios Pods Podfile.lock",
@@ -36,13 +25,8 @@
     "e2e-test-ios": "./scripts/maestro-test-ios.sh"
   },
   "dependencies": {
-<<<<<<< Upstream
-    "@react-native/new-app-screen": "0.84.0-main",
-    "@react-native/popup-menu-android": "0.84.0-main",
-=======
     "@react-native/new-app-screen": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native/popup-menu-android": "0.84.0-nightly-20251212-dd390dbbe",
->>>>>>> Override
     "flow-enums-runtime": "^0.0.6",
     "invariant": "^2.2.4",
     "nullthrows": "^1.1.1"
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
index f6afd2a7708..a9e14c6883b 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsi/jsi/test/testlib.cpp
@@ -1428,41 +1428,6 @@ TEST_P(JSITest, JSErrorTest) {
       JSIException);
 }
 
-<<<<<<< Upstream
-TEST_P(JSITest, MicrotasksTest) {
-  try {
-    rt.global().setProperty(rt, "globalValue", String::createFromAscii(rt, ""));
-
-    auto microtask1 =
-        function("function microtask1() { globalValue += 'hello'; }");
-    auto microtask2 =
-        function("function microtask2() { globalValue += ' world' }");
-
-    rt.queueMicrotask(microtask1);
-    rt.queueMicrotask(microtask2);
-
-    EXPECT_EQ(
-        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt), "");
-
-    rt.drainMicrotasks();
-
-    EXPECT_EQ(
-        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt),
-        "hello world");
-
-    // Microtasks shouldn't run again
-    rt.drainMicrotasks();
-
-    EXPECT_EQ(
-        rt.global().getProperty(rt, "globalValue").asString(rt).utf8(rt),
-        "hello world");
-  } catch (const JSINativeException&) {
-    // queueMicrotask() is unimplemented by some runtimes, ignore such failures.
-  }
-}
-
-=======
->>>>>>> Override
 //----------------------------------------------------------------------
 // Test that multiple levels of delegation in DecoratedHostObjects works.
 
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
deleted file mode 100644
index 8dbdbbb2325..00000000000
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h
+++ /dev/null
@@ -1,186 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#pragma once
-
-#include <unordered_map>
-
-#include <folly/dynamic.h>
-#include <glog/logging.h>
-#include <react/debug/react_native_expect.h>
-#include <react/renderer/core/PropsParserContext.h>
-#include <react/renderer/core/graphicsConversions.h>
-#include <react/renderer/imagemanager/primitives.h>
-
-namespace facebook::react {
-
-inline void fromRawValue(const PropsParserContext &context, const RawValue &value, ImageSource &result)
-{
-  if (value.hasType<std::string>()) {
-    result = {
-        /* .type = */ ImageSource::Type::Remote,
-        /* .uri = */ (std::string)value,
-    };
-    return;
-  }
-
-  if (value.hasType<std::unordered_map<std::string, RawValue>>()) {
-    auto items = (std::unordered_map<std::string, RawValue>)value;
-    result = {};
-
-    result.type = ImageSource::Type::Remote;
-
-    if (items.find("__packager_asset") != items.end()) {
-      result.type = ImageSource::Type::Local;
-    }
-
-    if (items.find("width") != items.end() && items.find("height") != items.end() &&
-        // The following checks have to be removed after codegen is shipped.
-        // See T45151459.
-        items.at("width").hasType<Float>() && items.at("height").hasType<Float>()) {
-      result.size = {(Float)items.at("width"), (Float)items.at("height")};
-    }
-
-    if (items.find("scale") != items.end() &&
-        // The following checks have to be removed after codegen is shipped.
-        // See T45151459.
-        items.at("scale").hasType<Float>()) {
-      result.scale = (Float)items.at("scale");
-    } else {
-      result.scale = items.find("deprecated") != items.end() ? 0.0f : 1.0f;
-    }
-
-    if (items.find("url") != items.end() &&
-        // The following should be removed after codegen is shipped.
-        // See T45151459.
-        items.at("url").hasType<std::string>()) {
-      result.uri = (std::string)items.at("url");
-    }
-
-    if (items.find("uri") != items.end() &&
-        // The following should be removed after codegen is shipped.
-        // See T45151459.
-        items.at("uri").hasType<std::string>()) {
-      result.uri = (std::string)items.at("uri");
-    }
-
-    if (items.find("bundle") != items.end() &&
-        // The following should be removed after codegen is shipped.
-        // See T45151459.
-        items.at("bundle").hasType<std::string>()) {
-      result.bundle = (std::string)items.at("bundle");
-      result.type = ImageSource::Type::Local;
-    }
-
-    if (items.find("headers") != items.end() &&
-        items.at("headers").hasType<std::unordered_map<std::string, std::string>>()) {
-      auto headers = (std::unordered_map<std::string, std::string>)items.at("headers");
-      for (const auto &header : headers) {
-        result.headers.push_back(header);
-      }
-    }
-
-    if (items.find("body") != items.end() && items.at("body").hasType<std::string>()) {
-      result.body = (std::string)items.at("body");
-    }
-
-    if (items.find("method") != items.end() && items.at("method").hasType<std::string>()) {
-      result.method = (std::string)items.at("method");
-    }
-
-    if (items.find("cache") != items.end() && items.at("cache").hasType<std::string>()) {
-      auto cache = (std::string)items.at("cache");
-      if (cache == "reload") {
-        result.cache = ImageSource::CacheStategy::Reload;
-      } else if (cache == "force-cache") {
-        result.cache = ImageSource::CacheStategy::ForceCache;
-      } else if (cache == "only-if-cached") {
-        result.cache = ImageSource::CacheStategy::OnlyIfCached;
-      }
-    }
-
-    return;
-  }
-
-  // The following should be removed after codegen is shipped.
-  // See T45151459.
-  result = {};
-  result.type = ImageSource::Type::Invalid;
-}
-
-inline std::string toString(const ImageSource &value)
-{
-  return "{uri: " + value.uri + "}";
-}
-
-inline void fromRawValue(const PropsParserContext &context, const RawValue &value, ImageResizeMode &result)
-{
-  react_native_expect(value.hasType<std::string>());
-  if (!value.hasType<std::string>()) {
-    LOG(ERROR) << "Unsupported ImageResizeMode type";
-    // "cover" is default in non-Fabric web and iOS
-    result = ImageResizeMode::Cover;
-    return;
-  }
-
-  auto stringValue = (std::string)value;
-  if (stringValue == "cover") {
-    result = ImageResizeMode::Cover;
-  } else if (stringValue == "contain") {
-    result = ImageResizeMode::Contain;
-  } else if (stringValue == "stretch") {
-    result = ImageResizeMode::Stretch;
-  } else if (stringValue == "center") {
-    result = ImageResizeMode::Center;
-  } else if (stringValue == "repeat") {
-    result = ImageResizeMode::Repeat;
-  } else if (stringValue == "none") {
-    result = ImageResizeMode::None;
-  } else {
-    LOG(ERROR) << "Unsupported ImageResizeMode value: " << stringValue;
-    react_native_expect(false);
-    // "cover" is default in non-Fabric web and iOS
-    result = ImageResizeMode::Cover;
-  }
-}
-
-inline std::string toString(const ImageResizeMode &value)
-{
-  switch (value) {
-    case ImageResizeMode::Cover:
-      return "cover";
-    case ImageResizeMode::Contain:
-      return "contain";
-    case ImageResizeMode::Stretch:
-      return "stretch";
-    case ImageResizeMode::Center:
-      return "center";
-    case ImageResizeMode::Repeat:
-      return "repeat";
-    case ImageResizeMode::None:
-      return "none";
-<<<<<<< Upstream
-    default:
-      LOG(ERROR) << "Unsupported ImageResizeMode value: " << (int)value;
-      react_native_expect(false);
-      // "cover" is default in non-Fabric web and iOS
-      return "cover";
-=======
-//#[Windows
-#if defined(_MSC_VER)
-    default:
-        __assume(0);
-#elif defined(__GNUC__) || defined(__clang__)
-    default:
-        __builtin_unreachable();
-#endif
-// 15379 #Windows]
->>>>>>> Override
-  }
-}
-
-} // namespace facebook::react
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h
deleted file mode 100644
index c624d5a430a..00000000000
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h
+++ /dev/null
@@ -1,198 +0,0 @@
-/*
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- */
-
-#pragma once
-
-#include <string>
-#include <vector>
-
-#include <react/debug/react_native_assert.h>
-#include <react/renderer/core/graphicsConversions.h>
-#include <react/renderer/core/propsConversions.h>
-#include <react/renderer/debug/debugStringConvertibleUtils.h>
-#include <react/renderer/graphics/Float.h>
-#include <react/renderer/graphics/Size.h>
-
-namespace facebook::react {
-
-class ImageSource {
- public:
-  enum class Type { Invalid, Remote, Local };
-  enum class CacheStategy { Default, Reload, ForceCache, OnlyIfCached };
-
-  Type type{};
-  std::string uri{};
-  std::string bundle{};
-  Float scale{3};
-  Size size{.width = 0};
-  std::string body{};
-  std::string method{};
-  CacheStategy cache = CacheStategy::Default;
-  std::vector<std::pair<std::string, std::string>> headers{};
-
-  bool operator==(const ImageSource &rhs) const
-  {
-    return std::tie(this->type, this->uri) == std::tie(rhs.type, rhs.uri);
-  }
-
-  bool operator!=(const ImageSource &rhs) const
-  {
-    return !(*this == rhs);
-  }
-
-#ifdef RN_SERIALIZABLE_STATE
-  folly::dynamic toDynamic() const
-  {
-    folly::dynamic imageSourceResult = folly::dynamic::object();
-    switch (type) {
-      case ImageSource::Type::Remote:
-        imageSourceResult["type"] = "remote";
-        break;
-      case ImageSource::Type::Local:
-        imageSourceResult["type"] = "local";
-        break;
-      case ImageSource::Type::Invalid:
-      default:
-        imageSourceResult["type"] = "invalid";
-        break;
-    }
-
-    imageSourceResult["uri"] = uri;
-    imageSourceResult["bundle"] = bundle;
-    imageSourceResult["scale"] = scale;
-
-    folly::dynamic sizeResult = folly::dynamic::object();
-    sizeResult["width"] = size.width;
-    sizeResult["height"] = size.height;
-    imageSourceResult["size"] = sizeResult;
-
-    imageSourceResult["body"] = body;
-    imageSourceResult["method"] = method;
-
-    switch (cache) {
-      case ImageSource::CacheStategy::Reload:
-        imageSourceResult["cache"] = "reload";
-        break;
-      case ImageSource::CacheStategy::ForceCache:
-        imageSourceResult["cache"] = "force-cache";
-        break;
-      case ImageSource::CacheStategy::OnlyIfCached:
-        imageSourceResult["cache"] = "only-if-cached";
-        break;
-      case ImageSource::CacheStategy::Default:
-      default:
-        imageSourceResult["cache"] = "default";
-        break;
-    }
-
-    folly::dynamic headersObject = folly::dynamic::object();
-    for (const auto &header : headers) {
-      headersObject[header.first] = header.second;
-    }
-    imageSourceResult["headers"] = headersObject;
-    return imageSourceResult;
-  }
-
-#endif
-
-#if RN_DEBUG_STRING_CONVERTIBLE
-  SharedDebugStringConvertibleList getDebugProps(const std::string &prefix) const
-  {
-    ImageSource imageSource{};
-
-    SharedDebugStringConvertibleList headersList;
-    for (const auto &header : headers) {
-      headersList.push_back(debugStringConvertibleItem(prefix + "-header-" + header.first, header.second));
-    }
-
-    return headersList +
-        SharedDebugStringConvertibleList{
-            debugStringConvertibleItem(prefix + "-type", toString(type), toString(imageSource.type)),
-            debugStringConvertibleItem(prefix + "-uri", uri, imageSource.uri),
-            debugStringConvertibleItem(prefix + "-bundle", bundle, imageSource.bundle),
-            debugStringConvertibleItem(prefix + "-scale", scale, imageSource.scale),
-            debugStringConvertibleItem(prefix + "-size", react::toString(size), react::toString(imageSource.size)),
-            debugStringConvertibleItem(prefix + "-body", body, imageSource.body),
-            debugStringConvertibleItem(prefix + "-method", method, imageSource.method),
-            debugStringConvertibleItem(prefix + "-cache", toString(cache), toString(imageSource.cache)),
-        };
-  }
-
-  std::string toString(const Type &typeValue) const
-  {
-    switch (typeValue) {
-      case ImageSource::Type::Invalid:
-        return "invalid";
-      case ImageSource::Type::Remote:
-        return "remote";
-      case ImageSource::Type::Local:
-        return "local";
-<<<<<<< Upstream
-      default:
-        react_native_assert(false && "Invalid ImageSource::Type");
-        return "";
-=======
-    //[Windows #15263
-    default:
-        return "Unknown"; 
-        //]
->>>>>>> Override
-    }
-  }
-
-  std::string toString(const CacheStategy &cacheValue) const
-  {
-    switch (cacheValue) {
-      case ImageSource::CacheStategy::Default:
-        return "default";
-      case ImageSource::CacheStategy::Reload:
-        return "reload";
-      case ImageSource::CacheStategy::ForceCache:
-        return "force-cache";
-      case ImageSource::CacheStategy::OnlyIfCached:
-        return "only-if-cached";
-<<<<<<< Upstream
-      default:
-        react_native_assert(false && "Invalid ImageSource::CacheStategy");
-        return "";
-=======
-        //[Windows #15263
-    default:
-        return "Unknown"; 
-        //]
->>>>>>> Override
-    }
-  }
-#endif
-};
-
-#ifdef RN_SERIALIZABLE_STATE
-inline folly::dynamic toDynamic(const ImageSource &imageSource)
-{
-  return imageSource.toDynamic();
-}
-#endif
-
-using ImageSources = std::vector<ImageSource>;
-
-enum class ImageResizeMode : int8_t {
-  Cover = 0,
-  Contain = 1,
-  Stretch = 2,
-  Center = 3,
-  Repeat = 4,
-  None = 5,
-};
-
-class ImageErrorInfo {
- public:
-  std::string error{};
-  int responseCode{};
-  std::vector<std::pair<std::string, std::string>> httpResponseHeaders{};
-};
-
-} // namespace facebook::react
diff --git a/vnext/overrides.json b/vnext/overrides.json
index fc5d2fb085a..e60b629e70d 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -152,13 +152,6 @@
       "baseHash": "b13e8a4b2521f13b0365b8cbc8cac947d959668f",
       "issue": 14204
     },
-    {
-      "type": "patch",
-      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/image/conversions.h",
-      "baseFile": "packages/react-native/ReactCommon/react/renderer/components/image/conversions.h",
-      "baseHash": "828baeee90c0961d8b4a2fe85a5611de8a346fad",
-      "issue": 15379
-    },
     {
       "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/components/text/BaseParagraphProps.cpp",
@@ -199,13 +192,6 @@
       "baseFile": "packages/react-native/ReactCommon/react/renderer/components/view/accessibilityPropsConversions.h",
       "baseHash": "72cc422293c0e70f454225476cdabd3458bbce5e"
     },
-    {
-      "type": "patch",
-      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/imagemanager/primitives.h",
-      "baseFile": "packages/react-native/ReactCommon/react/renderer/imagemanager/primitives.h",
-      "baseHash": "46a66e729e744fefab8b0a2a5a8c1d249136b03a",
-      "issue": 15263
-    },
     {
       "type": "copy",
       "directory": "ReactCopies/IntegrationTests",
diff --git a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
index 61bff1be17b..65259523ef9 100644
--- a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
+++ b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
@@ -15,17 +15,13 @@ import type {ViewStyleProp} from '../../StyleSheet/StyleSheet';
 import type {
   BlurEvent,
   FocusEvent,
-<<<<<<< Upstream
   GestureResponderEvent,
   KeyDownEvent,
   KeyUpEvent,
-=======
->>>>>>> Override
   LayoutChangeEvent,
   LayoutRectangle,
   MouseEvent,
   PointerEvent,
-  GestureResponderEvent,
   KeyEvent, // [Windows]
 } from '../../Types/CoreEventTypes';
 import type {
diff --git a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
index 7b2fa418f00..e07ba60bf57 100644
--- a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
+++ b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
@@ -369,8 +369,7 @@ export type KeyEvent = NativeSyntheticEvent<
     eventPhase: number,
   }>,
 >;
-<<<<<<< Upstream
-
+// Windows]
 export type KeyEvent = $ReadOnly<{
   /**
    * The actual key that was pressed. For example, F would be "f" or "F" depending on the shift key.
@@ -401,6 +400,3 @@ export type KeyEvent = $ReadOnly<{
 export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;
 
 export type KeyDownEvent = NativeSyntheticEvent<KeyEvent>;
-=======
-// Windows]
->>>>>>> Override

From d29166d7e376b8d3d5668899ec327b2e2af0b7ae Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 10:29:45 +0530
Subject: [PATCH 04/14] change for UnionTypeAnnotation

- https://github.com/facebook/react-native/pull/54489
---
 .../codegen/src/generators/ObjectTypes.ts     | 54 +++++++++++++------
 .../codegen/src/generators/ParamTypes.ts      | 50 ++++++++++++-----
 .../codegen/src/generators/PropObjectTypes.ts |  6 +--
 3 files changed, 79 insertions(+), 31 deletions(-)

diff --git a/packages/@react-native-windows/codegen/src/generators/ObjectTypes.ts b/packages/@react-native-windows/codegen/src/generators/ObjectTypes.ts
index 4f3423011b3..ebfcf5fa3c5 100644
--- a/packages/@react-native-windows/codegen/src/generators/ObjectTypes.ts
+++ b/packages/@react-native-windows/codegen/src/generators/ObjectTypes.ts
@@ -12,7 +12,7 @@ import type {
   NativeModuleUnionTypeAnnotation,
   NativeModuleStringTypeAnnotation,
   NativeModuleFunctionTypeAnnotation,
-  NativeModuleStringLiteralTypeAnnotation,
+  StringLiteralTypeAnnotation,
   StringLiteralUnionTypeAnnotation,
   UnsafeAnyTypeAnnotation,
   Nullable,
@@ -33,19 +33,44 @@ function translateUnionReturnType(
   type: NativeModuleEnumDeclaration | NativeModuleUnionTypeAnnotation,
   options: CppCodegenOptions,
 ): string {
-  const memberType = type.memberType;
-  switch (type.memberType) {
-    case 'StringTypeAnnotation':
-      return options.cppStringType;
-    case 'NumberTypeAnnotation':
-      return 'double';
-    case 'ObjectTypeAnnotation':
-      return '::React::JSValue';
-    default:
-      throw new Error(
-        `Unknown enum/union member type in translateReturnType: ${memberType}`,
-      );
+  if (type.type === 'EnumDeclaration') {
+    switch (type.memberType) {
+      case 'StringTypeAnnotation':
+        return options.cppStringType;
+      case 'NumberTypeAnnotation':
+        return 'double';
+      default:
+        throw new Error(
+          `Unknown enum member type in translateReturnType: ${type.memberType}`,
+        );
+    }
   }
+
+  // UnionTypeAnnotation: determine C++ type from the types array
+  const types = type.types;
+  if (types.length === 0) {
+    return '::React::JSValue';
+  }
+
+  const allString = types.every(
+    t =>
+      t.type === 'StringTypeAnnotation' ||
+      t.type === 'StringLiteralTypeAnnotation',
+  );
+  if (allString) {
+    return options.cppStringType;
+  }
+
+  const allNumber = types.every(
+    t =>
+      t.type === 'NumberTypeAnnotation' ||
+      t.type === 'NumberLiteralTypeAnnotation',
+  );
+  if (allNumber) {
+    return 'double';
+  }
+
+  return '::React::JSValue';
 }
 
 // eslint-disable-next-line complexity
@@ -55,7 +80,7 @@ export function translateFieldOrReturnType(
         | NativeModuleBaseTypeAnnotation
         | NativeModuleStringTypeAnnotation
         | NativeModuleFunctionTypeAnnotation
-        | NativeModuleStringLiteralTypeAnnotation
+        | StringLiteralTypeAnnotation
         | StringLiteralUnionTypeAnnotation
       >
     | UnsafeAnyTypeAnnotation,
@@ -69,7 +94,6 @@ export function translateFieldOrReturnType(
   switch (type.type) {
     case 'StringTypeAnnotation':
     case 'StringLiteralTypeAnnotation':
-    case 'StringLiteralUnionTypeAnnotation':
       return options.cppStringType;
     case 'NumberTypeAnnotation':
     case 'FloatTypeAnnotation':
diff --git a/packages/@react-native-windows/codegen/src/generators/ParamTypes.ts b/packages/@react-native-windows/codegen/src/generators/ParamTypes.ts
index 44f3c00f3af..dd3e2d609de 100644
--- a/packages/@react-native-windows/codegen/src/generators/ParamTypes.ts
+++ b/packages/@react-native-windows/codegen/src/generators/ParamTypes.ts
@@ -48,19 +48,44 @@ function translateUnionReturnType(
   target: ParamTarget,
   options: CppCodegenOptions,
 ): string {
-  const memberType = type.memberType;
-  switch (type.memberType) {
-    case 'StringTypeAnnotation':
-      return options.cppStringType;
-    case 'NumberTypeAnnotation':
-      return 'double';
-    case 'ObjectTypeAnnotation':
-      return decorateType('::React::JSValue', target);
-    default:
-      throw new Error(
-        `Unknown enum/union member type in translateReturnType: ${memberType}`,
-      );
+  if (type.type === 'EnumDeclaration') {
+    switch (type.memberType) {
+      case 'StringTypeAnnotation':
+        return options.cppStringType;
+      case 'NumberTypeAnnotation':
+        return 'double';
+      default:
+        throw new Error(
+          `Unknown enum member type in translateReturnType: ${type.memberType}`,
+        );
+    }
   }
+
+  // UnionTypeAnnotation: determine C++ type from the types array
+  const types = type.types;
+  if (types.length === 0) {
+    return decorateType('::React::JSValue', target);
+  }
+
+  const allString = types.every(
+    t =>
+      t.type === 'StringTypeAnnotation' ||
+      t.type === 'StringLiteralTypeAnnotation',
+  );
+  if (allString) {
+    return options.cppStringType;
+  }
+
+  const allNumber = types.every(
+    t =>
+      t.type === 'NumberTypeAnnotation' ||
+      t.type === 'NumberLiteralTypeAnnotation',
+  );
+  if (allNumber) {
+    return 'double';
+  }
+
+  return decorateType('::React::JSValue', target);
 }
 
 function translateFunction(
@@ -191,7 +216,6 @@ function translateParam(
   switch (param.type) {
     case 'StringTypeAnnotation':
     case 'StringLiteralTypeAnnotation':
-    case 'StringLiteralUnionTypeAnnotation':
       return options.cppStringType;
     case 'NumberTypeAnnotation':
     case 'FloatTypeAnnotation':
diff --git a/packages/@react-native-windows/codegen/src/generators/PropObjectTypes.ts b/packages/@react-native-windows/codegen/src/generators/PropObjectTypes.ts
index 28d525dc3ab..1f3ad6698ec 100644
--- a/packages/@react-native-windows/codegen/src/generators/PropObjectTypes.ts
+++ b/packages/@react-native-windows/codegen/src/generators/PropObjectTypes.ts
@@ -142,7 +142,7 @@ export function translateComponentEventType(type: EventTypeAnnotation,
           case 'ObjectTypeAnnotation':
             arrayTemplateArg = translateComponentEventType(type.elementType, aliases, baseAliasName, options).type;
             break;
-          case 'StringLiteralUnionTypeAnnotation':
+          case 'UnionTypeAnnotation':
             arrayTemplateArg = options.cppStringType; // TODO - better enum type handling than just passing a string
             break;
           default:
@@ -157,7 +157,7 @@ export function translateComponentEventType(type: EventTypeAnnotation,
     case 'MixedTypeAnnotation': {
       return { type: 'winrt::Microsoft::ReactNative::JSValue', initializer: '{nullptr}', alreadySupportsOptionalOrHasDefault: true };
     }
-    case 'StringLiteralUnionTypeAnnotation':
+    case 'UnionTypeAnnotation':
       return { type: options.cppStringType, initializer: '' };  // TODO - better enum type handling than just passing a string
     default:
       throw new Error(`Unhandled type: ${(type as any).type}`);
@@ -212,7 +212,7 @@ export function translateCommandParamType(type: CommandParamTypeAnnotation,
 
         return { type: `std::vector<${arrayTemplateArg}>`, initializer: '{}' };
       }
-    case 'ReservedTypeAnnotation': 
+    case 'ReservedTypeAnnotation':
       if ((type.name as any) !== 'RootTag') {
         throw new Error(`Unhandled ReservedTypeAnnotation: ${type.name}`)
       }

From 26e57118d6611d9c715afb7c41223d059616bb96 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 11:12:34 +0530
Subject: [PATCH 05/14] Update tester files

---
 .../Accessibility/AccessibilityExample.js     | 46 +++++++++++++++++
 .../js/examples/Text/TextExample.android.js   |  4 ++
 .../js/examples/Text/TextSharedExamples.js    | 51 ++++++++++++++++++-
 .../TurboModule/TurboCxxModuleExample.js      | 29 -----------
 .../js/examples/XHR/XHRExampleBinaryUpload.js | 22 ++------
 .../AccessibilityManagerTest.js               | 17 ++++---
 .../IntegrationTests/IntegrationTestsApp.js   |  6 +--
 .../IntegrationTests/LayoutEventsTest.js      |  2 +-
 .../IntegrationTests/TimersTest.js            |  2 +-
 .../IntegrationTests/WebSocketTest.js         |  2 +-
 10 files changed, 121 insertions(+), 60 deletions(-)
 delete mode 100644 packages/@react-native/tester/js/examples/TurboModule/TurboCxxModuleExample.js

diff --git a/packages/@react-native/tester/js/examples/Accessibility/AccessibilityExample.js b/packages/@react-native/tester/js/examples/Accessibility/AccessibilityExample.js
index 2be1048de48..f9e183bc4eb 100644
--- a/packages/@react-native/tester/js/examples/Accessibility/AccessibilityExample.js
+++ b/packages/@react-native/tester/js/examples/Accessibility/AccessibilityExample.js
@@ -1293,6 +1293,44 @@ class AnnounceForAccessibility extends React.Component<{}> {
     );
   };
 
+  _handleOnPressHighPriority = () => {
+    setTimeout(
+      () =>
+        AccessibilityInfo.announceForAccessibilityWithOptions(
+          'High Priority Announcement Test',
+          {priority: 'high'},
+        ),
+      1000,
+    );
+
+    setTimeout(
+      () =>
+        AccessibilityInfo.announceForAccessibility(
+          'Normal Priority Announcement',
+        ),
+      1100,
+    );
+  };
+
+  _handleOnPressLowPriority = () => {
+    setTimeout(
+      () =>
+        AccessibilityInfo.announceForAccessibilityWithOptions(
+          'Low Priority Announcement Test',
+          {priority: 'low'},
+        ),
+      1000,
+    );
+
+    setTimeout(
+      () =>
+        AccessibilityInfo.announceForAccessibility(
+          'Normal Priority Announcement',
+        ),
+      1100,
+    );
+  };
+
   render(): React.Node {
     return Platform.OS === 'ios' ? (
       <View>
@@ -1308,6 +1346,14 @@ class AnnounceForAccessibility extends React.Component<{}> {
           onPress={this._handleOnPressQueueMultiple}
           title="Announce for Accessibility Queue Multiple"
         />
+        <Button
+          onPress={this._handleOnPressHighPriority}
+          title="Announce for Accessibility High Priority"
+        />
+        <Button
+          onPress={this._handleOnPressLowPriority}
+          title="Announce for Accessibility Low Priority"
+        />
       </View>
     ) : (
       <View>
diff --git a/packages/@react-native/tester/js/examples/Text/TextExample.android.js b/packages/@react-native/tester/js/examples/Text/TextExample.android.js
index 70e1722244a..84443cf035e 100644
--- a/packages/@react-native/tester/js/examples/Text/TextExample.android.js
+++ b/packages/@react-native/tester/js/examples/Text/TextExample.android.js
@@ -1408,6 +1408,10 @@ const examples = [
           <RNTesterText style={{fontStyle: 'normal'}}>
             Move fast and be normal
           </RNTesterText>
+          <RNTesterText style={{fontStyle: 'italic'}}>
+            Move fast and be italic, but just be longer so that you don't fit on
+            a single line and make sure text is not truncated.
+          </RNTesterText>
         </>
       );
     },
diff --git a/packages/@react-native/tester/js/examples/Text/TextSharedExamples.js b/packages/@react-native/tester/js/examples/Text/TextSharedExamples.js
index fb483463394..cdbb36d8955 100644
--- a/packages/@react-native/tester/js/examples/Text/TextSharedExamples.js
+++ b/packages/@react-native/tester/js/examples/Text/TextSharedExamples.js
@@ -14,7 +14,7 @@ import type {TextLayoutLine} from 'react-native/Libraries/Types/CoreEventTypes';
 import RNTesterText from '../../components/RNTesterText';
 import {useTheme} from '../../components/RNTesterTheme';
 import {useState} from 'react';
-import {View} from 'react-native';
+import {StyleSheet, Text, View} from 'react-native';
 
 function InlineView(props: {
   textAlign: 'auto' | 'left' | 'right' | 'center' | 'justify',
@@ -193,6 +193,49 @@ component RtlAndInlineViewsExample() {
   );
 }
 
+component TextWithLinkRoleExample() {
+  const handlePress = () => console.log('Link Press');
+
+  return (
+    <View>
+      <Text role="link" style={styles.link} onPress={handlePress}>
+        Link Text
+      </Text>
+
+      <Text>
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link
+        </Text>
+      </Text>
+
+      <Text>
+        Before{' '}
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link
+        </Text>
+        {' After'}
+      </Text>
+
+      <Text>
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link 1
+        </Text>
+        {' - '}
+        <Text role="link" style={styles.link} onPress={handlePress}>
+          Nested Link 2
+        </Text>
+      </Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  link: {
+    color: 'teal',
+    textDecorationLine: 'underline',
+  },
+});
+
 export default [
   {
     title: 'Empty Text',
@@ -222,4 +265,10 @@ export default [
     scrollable: true,
     render: NumberOfLinesTextLayoutExample,
   },
+  {
+    title: 'Text with link role',
+    name: 'textWithLinkRole',
+    description: 'Shows the a11y behavior of Text with role="link"',
+    render: TextWithLinkRoleExample,
+  },
 ] as $ReadOnlyArray<RNTesterModuleExample>;
diff --git a/packages/@react-native/tester/js/examples/TurboModule/TurboCxxModuleExample.js b/packages/@react-native/tester/js/examples/TurboModule/TurboCxxModuleExample.js
deleted file mode 100644
index 65771081a17..00000000000
--- a/packages/@react-native/tester/js/examples/TurboModule/TurboCxxModuleExample.js
+++ /dev/null
@@ -1,29 +0,0 @@
-/**
- * Copyright (c) Meta Platforms, Inc. and affiliates.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @flow
- * @format
- */
-
-'use strict';
-
-import type {RNTesterModuleExample} from '../../types/RNTesterTypes';
-
-const NativeCxxModuleExampleExample = require('./NativeCxxModuleExampleExample');
-const React = require('react');
-
-exports.displayName = (undefined: ?string);
-exports.title = 'Cxx TurboModule';
-exports.category = 'Basic';
-exports.description = 'Usage of Cxx TurboModule';
-exports.examples = [
-  {
-    title: 'TurboCxxModuleExample',
-    render: function (): React.MixedElement {
-      return <NativeCxxModuleExampleExample />;
-    },
-  },
-] as Array<RNTesterModuleExample>;
diff --git a/packages/@react-native/tester/js/examples/XHR/XHRExampleBinaryUpload.js b/packages/@react-native/tester/js/examples/XHR/XHRExampleBinaryUpload.js
index 7ecf186661c..2d00402f38a 100644
--- a/packages/@react-native/tester/js/examples/XHR/XHRExampleBinaryUpload.js
+++ b/packages/@react-native/tester/js/examples/XHR/XHRExampleBinaryUpload.js
@@ -13,14 +13,7 @@
 import RNTesterText from '../../components/RNTesterText';
 import RNTOption from '../../components/RNTOption';
 import React from 'react';
-import {
-  Alert,
-  Linking,
-  StyleSheet,
-  Text,
-  TouchableHighlight,
-  View,
-} from 'react-native';
+import {Alert, StyleSheet, Text, TouchableHighlight, View} from 'react-native';
 
 const BINARY_TYPES = {
   String,
@@ -62,17 +55,12 @@ class XHRExampleBinaryUpload extends React.Component<{...}, $FlowFixMe> {
       Alert.alert('Upload failed', 'No response payload.');
       return;
     }
-    const index = xhr.responseText.indexOf(
-      'http://ptsv2.com/t/react-native/d/',
-    );
-    if (index === -1) {
+    const {status} = JSON.parse(xhr.responseText);
+    if (status !== 'success') {
       Alert.alert('Upload failed', 'Invalid response payload.');
       return;
     }
-    const url = xhr.responseText.slice(index).split('\n')[0];
-    console.log('Upload successful: ' + url);
-    // $FlowFixMe[unused-promise]
-    Linking.openURL(url);
+    Alert.alert('Upload successful: https://ptsv3.com/react-native');
   }
 
   state: $FlowFixMe | {type: 'Uint8Array'} = {
@@ -81,7 +69,7 @@ class XHRExampleBinaryUpload extends React.Component<{...}, $FlowFixMe> {
 
   _upload = () => {
     const xhr = new XMLHttpRequest();
-    xhr.open('POST', 'http://ptsv2.com/t/react-native/post');
+    xhr.open('POST', 'https://ptsv3.com/t/react-native/post');
     xhr.onload = () => XHRExampleBinaryUpload.handlePostTestServerUpload(xhr);
     xhr.setRequestHeader('Content-Type', 'text/plain');
 
diff --git a/vnext/ReactCopies/IntegrationTests/AccessibilityManagerTest.js b/vnext/ReactCopies/IntegrationTests/AccessibilityManagerTest.js
index 276ef0e9d6b..77dee3f06fe 100644
--- a/vnext/ReactCopies/IntegrationTests/AccessibilityManagerTest.js
+++ b/vnext/ReactCopies/IntegrationTests/AccessibilityManagerTest.js
@@ -23,6 +23,16 @@ function AccessibilityManagerTest(): React.Node {
       "NativeAccessibilityManager doesn't exist",
     );
 
+    const subscription = DeviceEventEmitter.addListener(
+      'didUpdateDimensions',
+      update => {
+        // some of the updates may come from lifecycle methods, which would carry different values than the ones we set
+        if (update.window.fontScale === 4.0) {
+          TestModule.markTestPassed(true);
+        }
+      },
+    );
+
     NativeAccessibilityManager.setAccessibilityContentSizeMultipliers({
       extraSmall: 1.0,
       small: 2.0,
@@ -38,13 +48,6 @@ function AccessibilityManagerTest(): React.Node {
       accessibilityExtraExtraExtraLarge: 12.0,
     });
 
-    const subscription = DeviceEventEmitter.addListener(
-      'didUpdateDimensions',
-      update => {
-        TestModule.markTestPassed(update.window.fontScale === 4.0);
-      },
-    );
-
     return () => {
       subscription.remove();
     };
diff --git a/vnext/ReactCopies/IntegrationTests/IntegrationTestsApp.js b/vnext/ReactCopies/IntegrationTests/IntegrationTestsApp.js
index c9f736ab38d..cb2b54dd23b 100644
--- a/vnext/ReactCopies/IntegrationTests/IntegrationTestsApp.js
+++ b/vnext/ReactCopies/IntegrationTests/IntegrationTestsApp.js
@@ -31,11 +31,11 @@ const TESTS = [
   require('./WebSocketTest'),
   require('./AccessibilityManagerTest'),
   require('./GlobalEvalWithSourceUrlTest'),
-];
+].map(mod => mod.default);
 
 TESTS.forEach(test =>
   AppRegistry.registerComponent(
-    test.displayName || test.name || '',
+    (test as React.ComponentType<any>).displayName || test.name || '',
     /* $FlowFixMe[incompatible-type] (>=0.54.0 site=react_native_fb,react_native_
      * oss) This comment suppresses an error found when Flow v0.54 was deployed.
      * To see the error delete this comment and run Flow. */
@@ -83,7 +83,7 @@ class IntegrationTestsApp extends React.Component<{...}, $FlowFixMe> {
                */
               style={styles.row}>
               <Text style={styles.testName}>
-                {test.displayName || test.name}
+                {(test as React.ComponentType<any>).displayName || test.name}
               </Text>
             </TouchableOpacity>,
             <View style={styles.separator} />,
diff --git a/vnext/ReactCopies/IntegrationTests/LayoutEventsTest.js b/vnext/ReactCopies/IntegrationTests/LayoutEventsTest.js
index ed6796bb355..57eb5855c8c 100644
--- a/vnext/ReactCopies/IntegrationTests/LayoutEventsTest.js
+++ b/vnext/ReactCopies/IntegrationTests/LayoutEventsTest.js
@@ -201,4 +201,4 @@ const styles = StyleSheet.create({
 });
 
 LayoutEventsTest.displayName = 'LayoutEventsTest';
-module.exports = LayoutEventsTest;
+export default LayoutEventsTest;
diff --git a/vnext/ReactCopies/IntegrationTests/TimersTest.js b/vnext/ReactCopies/IntegrationTests/TimersTest.js
index 7040a3fe6ab..c7c055cb601 100644
--- a/vnext/ReactCopies/IntegrationTests/TimersTest.js
+++ b/vnext/ReactCopies/IntegrationTests/TimersTest.js
@@ -283,4 +283,4 @@ const styles = StyleSheet.create({
 });
 
 TimersTest.displayName = 'TimersTest';
-module.exports = TimersTest;
+export default TimersTest;
diff --git a/vnext/ReactCopies/IntegrationTests/WebSocketTest.js b/vnext/ReactCopies/IntegrationTests/WebSocketTest.js
index 1198e8b0e65..944d32642fa 100644
--- a/vnext/ReactCopies/IntegrationTests/WebSocketTest.js
+++ b/vnext/ReactCopies/IntegrationTests/WebSocketTest.js
@@ -151,4 +151,4 @@ class WebSocketTest extends React.Component<{...}, State> {
 
 WebSocketTest.displayName = 'WebSocketTest';
 
-module.exports = WebSocketTest;
+export default WebSocketTest;

From 2cfffd2dd25c4c09173fae755edc7b2442091db1 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 14:16:17 +0530
Subject: [PATCH 06/14] yarn build fixes

---
 .../react-native-win32/package.json           |   2 +-
 vnext/.flowconfig                             |   9 +-
 vnext/package.json                            |   2 +-
 yarn.lock                                     | 179 +++++-------------
 4 files changed, 50 insertions(+), 142 deletions(-)

diff --git a/packages/@office-iss/react-native-win32/package.json b/packages/@office-iss/react-native-win32/package.json
index 5c889c14293..dea980a02b7 100644
--- a/packages/@office-iss/react-native-win32/package.json
+++ b/packages/@office-iss/react-native-win32/package.json
@@ -84,7 +84,7 @@
     "@types/prop-types": "15.7.1",
     "@types/react": "^19.2.0",
     "eslint": "^8.19.0",
-    "flow-bin": "^0.289.0",
+    "flow-bin": "^0.293.0",
     "jscodeshift": "^0.14.0",
     "just-scripts": "^1.3.3",
     "prettier": "2.8.8",
diff --git a/vnext/.flowconfig b/vnext/.flowconfig
index 53bd4b82ce2..9173d9c18e0 100644
--- a/vnext/.flowconfig
+++ b/vnext/.flowconfig
@@ -138,19 +138,12 @@ module.file_ext=.windows.js
 
 munge_underscores=true
 
-<<<<<<< Upstream
-module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/packages/react-native/index.js'
-module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-native/\1'
-module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
-module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
-=======
 module.name_mapper='^react-native$' -> '<PROJECT_ROOT>/index.windows.js'
 module.name_mapper='^react-native-windows$' -> '<PROJECT_ROOT>/index.windows.js'
 module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^react-native-windows/\(.*\)$' -> '<PROJECT_ROOT>/\1'
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/\1'
-module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
->>>>>>> Override
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\|ktx\|heic\|heif\)$' -> '<PROJECT_ROOT>/Libraries/Image/RelativeImageStub'
 
 module.system.haste.module_ref_prefix=m#
 
diff --git a/vnext/package.json b/vnext/package.json
index 713d12776b3..aca3a424b28 100644
--- a/vnext/package.json
+++ b/vnext/package.json
@@ -79,7 +79,7 @@
     "@types/node": "^22.14.0",
     "@types/react": "^19.2.0",
     "eslint": "^8.19.0",
-    "flow-bin": "^0.289.0",
+    "flow-bin": "^0.293.0",
     "jscodeshift": "^0.14.0",
     "just-scripts": "^1.3.3",
     "prettier": "2.8.8",
diff --git a/yarn.lock b/yarn.lock
index 110fd11dd2b..80379a3081b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2568,11 +2568,6 @@
     graceful-fs "^4.2.8"
     minimatch "^10.0.3"
 
-"@react-native/assets-registry@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/assets-registry/-/assets-registry-0.83.0-nightly-20251104-502efe1cc.tgz#8f4d5f45b1d624e8dc373435b6187d00feedfe57"
-  integrity sha512-qMZIX+5xyEGHwcn45OBpSnXdLl9YIq7byy32SmEfvd2ywe4zv6RYCyjf0T6ecfafyCo+ZPAV1q/HdWgw67qYww==
-
 "@react-native/assets-registry@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/assets-registry/-/assets-registry-0.84.0-nightly-20251212-dd390dbbe.tgz#fe6376ba287256a3735706c278ed9cc08eb6f2a0"
@@ -2583,18 +2578,18 @@
   resolved "https://registry.yarnpkg.com/@react-native/assets/-/assets-1.0.0.tgz#c6f9bf63d274bafc8e970628de24986b30a55c8e"
   integrity sha512-KrwSpS1tKI70wuKl68DwJZYEvXktDHdZMG0k2AXD/rJVSlB23/X2CB2cutVR0HwNMJIal9HOUOBB2rVfa6UGtQ==
 
-"@react-native/babel-plugin-codegen@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/babel-plugin-codegen/-/babel-plugin-codegen-0.83.0-nightly-20251104-502efe1cc.tgz#92f61d8d8f9dd5fee88c5be7d0fba5e3eed43412"
-  integrity sha512-sUhUtgBrhEDTk5h4FeByQX5RqZFqZqElSTieKiRF9oPBZm2Jjk4K+uf2//XJvsYLup07GlgICQ1Z++X6Mgf8Vg==
+"@react-native/babel-plugin-codegen@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/babel-plugin-codegen/-/babel-plugin-codegen-0.84.0-nightly-20251212-dd390dbbe.tgz#4f4d8e067eb0d09bbb8f2b4809d0afa85cfcc0b0"
+  integrity sha512-DcWlBTIXMjxzPVQJLACkTWsyEe38PNhb3FlK1uLTQoZalmZApOkHmk641J5vfOsSYqYFwk2mk5/zK1YFQ+dS1g==
   dependencies:
     "@babel/traverse" "^7.25.3"
-    "@react-native/codegen" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/codegen" "0.84.0-nightly-20251212-dd390dbbe"
 
-"@react-native/babel-preset@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/babel-preset/-/babel-preset-0.83.0-nightly-20251104-502efe1cc.tgz#e8b0f1e510eb07a4ea9f3f1a86b8673ed43c419d"
-  integrity sha512-hBfvEKgXb90+jsQVzlhPluFGr4+Kiy49WvheMVULQ0Tz8budP2Hz/0851VBdcHHBn/p4G8lKhlDCPTeiY1o7ag==
+"@react-native/babel-preset@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/babel-preset/-/babel-preset-0.84.0-nightly-20251212-dd390dbbe.tgz#d2a661753efb76f8f2acc71a1a79cb54aeb8c885"
+  integrity sha512-KyLsdAuLYaDb1pKyDTGKUsE/vu5wnbXm1SNueE41KX6OHGobSOR2fyH1ly9hpfUFOGoyf3DEKEyuH1eonmPIlQ==
   dependencies:
     "@babel/core" "^7.25.2"
     "@babel/plugin-proposal-export-default-from" "^7.24.7"
@@ -2637,24 +2632,11 @@
     "@babel/plugin-transform-typescript" "^7.25.2"
     "@babel/plugin-transform-unicode-regex" "^7.24.7"
     "@babel/template" "^7.25.0"
-    "@react-native/babel-plugin-codegen" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/babel-plugin-codegen" "0.84.0-nightly-20251212-dd390dbbe"
     babel-plugin-syntax-hermes-parser "0.32.0"
     babel-plugin-transform-flow-enums "^0.0.2"
     react-refresh "^0.14.0"
 
-"@react-native/codegen@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/codegen/-/codegen-0.83.0-nightly-20251104-502efe1cc.tgz#effa08722928c682bb6fe4cba8feedb2f9b60ea6"
-  integrity sha512-Ew7EM5zhwk4mdHMuRipi3cLfry8fJRRNEo5afg/Id8O0dGynW0GGD/ZKkNIJUSBzcv4ZXY6XR8ND+mNnqVzrXg==
-  dependencies:
-    "@babel/core" "^7.25.2"
-    "@babel/parser" "^7.25.3"
-    glob "^7.1.1"
-    hermes-parser "0.32.0"
-    invariant "^2.2.4"
-    nullthrows "^1.1.1"
-    yargs "^17.6.2"
-
 "@react-native/codegen@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/codegen/-/codegen-0.84.0-nightly-20251212-dd390dbbe.tgz#e84347d1b49b74bffc2b8c32be0c4c755e11ed1b"
@@ -2668,19 +2650,6 @@
     tinyglobby "^0.2.15"
     yargs "^17.6.2"
 
-"@react-native/community-cli-plugin@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/community-cli-plugin/-/community-cli-plugin-0.83.0-nightly-20251104-502efe1cc.tgz#2f4c30c9bbdd8b9b4930a194deef4f1c7ca17e11"
-  integrity sha512-Oc4VfFqIb1iDZAB6nC1S4WqsAjuYWWui3ZSqGrieH6forVWXFE94yAMvdc4g3q+/XF99M+jHiUkIRV73cOBR3w==
-  dependencies:
-    "@react-native/dev-middleware" "0.83.0-nightly-20251104-502efe1cc"
-    debug "^4.4.0"
-    invariant "^2.2.4"
-    metro "^0.83.3"
-    metro-config "^0.83.3"
-    metro-core "^0.83.3"
-    semver "^7.1.3"
-
 "@react-native/community-cli-plugin@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/community-cli-plugin/-/community-cli-plugin-0.84.0-nightly-20251212-dd390dbbe.tgz#246a47f55b302a219739ecae01e13bbde431e4f9"
@@ -2694,24 +2663,11 @@
     metro-core "^0.83.3"
     semver "^7.1.3"
 
-"@react-native/debugger-frontend@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/debugger-frontend/-/debugger-frontend-0.83.0-nightly-20251104-502efe1cc.tgz#0453bf2eb3c40c296b6ade448794ce29e6b1aa60"
-  integrity sha512-YyAC8vJTuxg2bVhQij6zNKH+qcHpn+3S0cK72Fyapgh96BdwG6Lr4upAYqQJnI+8rA8Ram/BUchDqkT2HWEcBA==
-
 "@react-native/debugger-frontend@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/debugger-frontend/-/debugger-frontend-0.84.0-nightly-20251212-dd390dbbe.tgz#692659de33d40399f558bc78265f683e85dee4ae"
   integrity sha512-w/Zoh3GbTzcAJWm1Lx+B3ynWL620TNwzaMyGwFTWnjE0bcWiKXVMQlZ7b28Nf0deDxg8vOaJ13ysFf1WTwpR+A==
 
-"@react-native/debugger-shell@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/debugger-shell/-/debugger-shell-0.83.0-nightly-20251104-502efe1cc.tgz#980416fba85bfb8ab1eb8fac45336c11e84b0e3c"
-  integrity sha512-e5H4vuYXFFV5ZLffkMV81SE3U0sPvshn7eADrsbPdqnwGZh5GHSMHk5Kw5RSU39ADWNtpfARrEGfXC+WkJd4Fw==
-  dependencies:
-    cross-spawn "^7.0.6"
-    fb-dotslash "0.5.8"
-
 "@react-native/debugger-shell@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/debugger-shell/-/debugger-shell-0.84.0-nightly-20251212-dd390dbbe.tgz#05f74f2d5d83e4490680ef750e52adbaffceff1d"
@@ -2720,24 +2676,6 @@
     cross-spawn "^7.0.6"
     fb-dotslash "0.5.8"
 
-"@react-native/dev-middleware@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/dev-middleware/-/dev-middleware-0.83.0-nightly-20251104-502efe1cc.tgz#f46dad915f30c4ff7b355175379ae890101dcead"
-  integrity sha512-Wvh/mxYRsHmqAYOsds1M0Zw00mHv0mJRuhN3THvmqe5YN4jpDVF+KPdZeF1KXD8dNEXjbCbhEtSkqSrw16THtw==
-  dependencies:
-    "@isaacs/ttlcache" "^1.4.1"
-    "@react-native/debugger-frontend" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/debugger-shell" "0.83.0-nightly-20251104-502efe1cc"
-    chrome-launcher "^0.15.2"
-    chromium-edge-launcher "^0.2.0"
-    connect "^3.6.5"
-    debug "^4.4.0"
-    invariant "^2.2.4"
-    nullthrows "^1.1.1"
-    open "^7.0.3"
-    serve-static "^1.16.2"
-    ws "^7.5.10"
-
 "@react-native/dev-middleware@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/dev-middleware/-/dev-middleware-0.84.0-nightly-20251212-dd390dbbe.tgz#feefbd59562d96423a1ab13542217c70c47e2308"
@@ -2756,14 +2694,14 @@
     serve-static "^1.16.2"
     ws "^7.5.10"
 
-"@react-native/eslint-config@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/eslint-config/-/eslint-config-0.83.0-nightly-20251104-502efe1cc.tgz#59bddce6ff9c38084fa2867df097b8f915ad2975"
-  integrity sha512-F8T8h/B+wPveGFewGT3cmJn9ZxwRfl3ua1S1vBw3ZSFdM2IwdBScrBWQ/ZHistctOcv/WNlKpg6QtF7AVloBXw==
+"@react-native/eslint-config@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/eslint-config/-/eslint-config-0.84.0-nightly-20251212-dd390dbbe.tgz#a0989f8bc06116398479265c259e69c3d3d4fb2a"
+  integrity sha512-kMw/mEaVNjy2V/bd1IajplY99biEGZNrsXKvB/fEQA1rUFJj7VolSinBnxc62oQNotj03q9Ut90NDM0UaBypDA==
   dependencies:
     "@babel/core" "^7.25.2"
     "@babel/eslint-parser" "^7.25.1"
-    "@react-native/eslint-plugin" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/eslint-plugin" "0.84.0-nightly-20251212-dd390dbbe"
     "@typescript-eslint/eslint-plugin" "^8.36.0"
     "@typescript-eslint/parser" "^8.36.0"
     eslint-config-prettier "^8.5.0"
@@ -2772,50 +2710,40 @@
     eslint-plugin-jest "^29.0.1"
     eslint-plugin-react "^7.30.1"
     eslint-plugin-react-hooks "^7.0.1"
-    eslint-plugin-react-native "^4.0.0"
-
-"@react-native/eslint-plugin@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/eslint-plugin/-/eslint-plugin-0.83.0-nightly-20251104-502efe1cc.tgz#2bbe330341b9bc04dc8c9b0fb756ba7361bddd77"
-  integrity sha512-SGuxfzuJo/PPMO5BUSWs2HuYLWM2dRjC3LvCGiFsLCZddtPhNIfL247mnMXb7k1GEiv+q3OL0kFJd3DWgd35+g==
+    eslint-plugin-react-native "^5.0.0"
 
-"@react-native/gradle-plugin@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/gradle-plugin/-/gradle-plugin-0.83.0-nightly-20251104-502efe1cc.tgz#f91846863f98506c7f260eed66ec2bffa10d5082"
-  integrity sha512-B++pfoh0/I+PHS9xCF9jFB2wV1i2PlyQ0fbeUpGg90hiM+DVmFdWbtvVGh3NGQsuelPbeuCxNizjdklYcXawVg==
+"@react-native/eslint-plugin@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/eslint-plugin/-/eslint-plugin-0.84.0-nightly-20251212-dd390dbbe.tgz#f01a951dd7a34503ee8111d8cf4174189d4e072d"
+  integrity sha512-9qJKgvU7vJk++ihhcTPhtlGikBAMsijLyAdd/HkcQ7O3x7K1AmrBQ0XBfI7SIw93LVbsZSBx7h0xiH0IXfVuCw==
 
 "@react-native/gradle-plugin@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/gradle-plugin/-/gradle-plugin-0.84.0-nightly-20251212-dd390dbbe.tgz#7af4251c768b4c0285821d696632610ba7ec4b4a"
   integrity sha512-3FAakCive56vgIh61idX2qhDU1Gvhp793uE/cOyjWbYlZelpG89HLoS7YUSlvxhrR8nqOKuQ2AkooqJMNjwoWw==
 
-"@react-native/js-polyfills@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/js-polyfills/-/js-polyfills-0.83.0-nightly-20251104-502efe1cc.tgz#f388af658bf8586c9d7d48d5d6201ebcbe7bd83f"
-  integrity sha512-O4a0C1H5BU7h30xb72x4+8XLu3vEId07UCkMk5Hfwts3eANarKOajD8tCk9Abo5eN13S4AmYvn00+DZ1in+/Vw==
-
 "@react-native/js-polyfills@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/js-polyfills/-/js-polyfills-0.84.0-nightly-20251212-dd390dbbe.tgz#b7854810b9c2cda2e2f79eb0b14de3b2a2de3ecc"
   integrity sha512-2CbRod1/QoEKZQ55H8LowsDqS0vZkd84sLckWfPC7wQkFOD6IJcKVgz0ubuqlAtdH/pY2fNwqevwBAOhDSg5rA==
 
-"@react-native/metro-babel-transformer@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/metro-babel-transformer/-/metro-babel-transformer-0.83.0-nightly-20251104-502efe1cc.tgz#1a7a4ac382203add3d56905b2d90f6f6d26baf4d"
-  integrity sha512-HPuWgera/eK+fasFHOlbLP7/uW7G5JHf7FXjlCOXB57bzaTINC7i2o4QyH+dpQJkDn1E4bElAjJyrXTPe7wDpg==
+"@react-native/metro-babel-transformer@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/metro-babel-transformer/-/metro-babel-transformer-0.84.0-nightly-20251212-dd390dbbe.tgz#54e2bd1fa4be53d9dd671b5012c29c37b7367e81"
+  integrity sha512-EwoDHa8zmdy71ovMwN3edrB8C5lh4TSIpn7Pr3INLLT630FoRDxCCiqXrQqm7q1fK+kTUOIt1Xs0cx1kqAT0Og==
   dependencies:
     "@babel/core" "^7.25.2"
-    "@react-native/babel-preset" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/babel-preset" "0.84.0-nightly-20251212-dd390dbbe"
     hermes-parser "0.32.0"
     nullthrows "^1.1.1"
 
-"@react-native/metro-config@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/metro-config/-/metro-config-0.83.0-nightly-20251104-502efe1cc.tgz#29f6c51c09d3d6abb07a2b17ee33d8e39056d33c"
-  integrity sha512-bJaohnAlwSTo+2oE9ykErlHeJpZZXQq8YUJPJ8JOU8768DODAXYJsQ7e70y+AGGvYGXe/Hfsvy4MjQ8MZz+gZw==
+"@react-native/metro-config@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/metro-config/-/metro-config-0.84.0-nightly-20251212-dd390dbbe.tgz#cf99b0dbcb436389cec09763c2775193aaf5ff93"
+  integrity sha512-KA67gfY+LHXXBL8DhcTYoEtZfU9wiRzRifPj6ewt5O5iOURk+SqON4YHz9Td5UgJGW8MakLPvPA+TFGYy5TPJQ==
   dependencies:
-    "@react-native/js-polyfills" "0.83.0-nightly-20251104-502efe1cc"
-    "@react-native/metro-babel-transformer" "0.83.0-nightly-20251104-502efe1cc"
+    "@react-native/js-polyfills" "0.84.0-nightly-20251212-dd390dbbe"
+    "@react-native/metro-babel-transformer" "0.84.0-nightly-20251212-dd390dbbe"
     metro-config "^0.83.3"
     metro-runtime "^0.83.3"
 
@@ -2824,34 +2752,21 @@
   resolved "https://registry.yarnpkg.com/@react-native/new-app-screen/-/new-app-screen-0.82.0-nightly-20250821-0ef21bf8a.tgz#f7b64f7bd93945bdea0d597d973b11d079bbceb9"
   integrity sha512-IcNqFAgsUTEt/GxJDW7PaoOS2Sn3iTQijnPGCIBkmlo/PBlnOzOZOXT6nz58aVdWYbHVh9+WTuItv/dpeKgzMg==
 
-"@react-native/new-app-screen@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/new-app-screen/-/new-app-screen-0.83.0-nightly-20251104-502efe1cc.tgz#595341f37a728ee7cefd75ffa9e27cb0e31329c1"
-  integrity sha512-ejQGZTEuplwoU+AZ6C+CiThzAbm96+do3AVGRYLht6Dcw47aiVdbtMn77+aqdFtadW+iGWkxCSrmls3grzFUog==
-
-"@react-native/normalize-colors@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/normalize-colors/-/normalize-colors-0.83.0-nightly-20251104-502efe1cc.tgz#60be84b59e60cf43d95db29f4793a09952e95828"
-  integrity sha512-LVJuk+/CA5TpzCLkFQP6klKjnSRG0mNv1O5C7pLFSBDfChpkbTuZBow07GcHR0lkha71vFQDsMTaMsDhbCJSDw==
+"@react-native/new-app-screen@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/new-app-screen/-/new-app-screen-0.84.0-nightly-20251212-dd390dbbe.tgz#957da67daee72de3cc4f00db312f387b566a4a89"
+  integrity sha512-LNm7jdzQxz1bP+Mpmk5yPnjNHp+OhGiV+yfgjJt7CYcBQZXlpIfWP04T5LxXNlrKlTN8HTuP2xtTLnuJpzZYHQ==
 
 "@react-native/normalize-colors@0.84.0-nightly-20251212-dd390dbbe":
   version "0.84.0-nightly-20251212-dd390dbbe"
   resolved "https://registry.yarnpkg.com/@react-native/normalize-colors/-/normalize-colors-0.84.0-nightly-20251212-dd390dbbe.tgz#d265c1974ef01e72b684a03a75ac28e376bf156f"
   integrity sha512-TfcO68100H/EA+j3io5v0JZM0fun7W52hdHvmTo3nWYRl+olCjs3QRyEGVb8KgHbTbKs/N1F9oCQZEFLwL40yQ==
 
-"@react-native/popup-menu-android@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/popup-menu-android/-/popup-menu-android-0.83.0-nightly-20251104-502efe1cc.tgz#e213f8a1d27caa46dce3620a56642a4c26ee8762"
-  integrity sha512-jExeIni0ZZta4UYuGlpCtzIJ8gyVM2UumwH9Po4pCiFnPPWr29/mg0K2ooTKJO+HQYE2o/qs+565F4zfhGv6NA==
-  dependencies:
-    nullthrows "^1.1.1"
-
-"@react-native/virtualized-lists@0.83.0-nightly-20251104-502efe1cc":
-  version "0.83.0-nightly-20251104-502efe1cc"
-  resolved "https://registry.yarnpkg.com/@react-native/virtualized-lists/-/virtualized-lists-0.83.0-nightly-20251104-502efe1cc.tgz#6ba1949fb90393151366f3e4eaeb26c980030669"
-  integrity sha512-LuYH9DC3Qns+Fs/kFOyc7q1vtRCNDEAL879tW8pS5nk0RdAXh+zSXhTRzl60l+9JDGToMcSQIeqs/UdZjHeANA==
+"@react-native/popup-menu-android@0.84.0-nightly-20251212-dd390dbbe":
+  version "0.84.0-nightly-20251212-dd390dbbe"
+  resolved "https://registry.yarnpkg.com/@react-native/popup-menu-android/-/popup-menu-android-0.84.0-nightly-20251212-dd390dbbe.tgz#4f572f5a86f99ce526d4ebed72c2e89b63171a3c"
+  integrity sha512-TX2ervfCYelP4JvUIaDaZTJqVC091MhrW0oUHtdeh9AUGyv7BJrE46TZnxpLCQq+/suKf4okyPWKFvifDV2/kA==
   dependencies:
-    invariant "^2.2.4"
     nullthrows "^1.1.1"
 
 "@react-native/virtualized-lists@0.84.0-nightly-20251212-dd390dbbe":
@@ -6272,10 +6187,10 @@ eslint-plugin-react-native-globals@^0.1.1:
   resolved "https://registry.yarnpkg.com/eslint-plugin-react-native-globals/-/eslint-plugin-react-native-globals-0.1.2.tgz#ee1348bc2ceb912303ce6bdbd22e2f045ea86ea2"
   integrity sha512-9aEPf1JEpiTjcFAmmyw8eiIXmcNZOqaZyHO77wgm0/dWfT/oxC1SrIq8ET38pMxHYrcB6Uew+TzUVsBeczF88g==
 
-eslint-plugin-react-native@^4.0.0:
-  version "4.1.0"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-react-native/-/eslint-plugin-react-native-4.1.0.tgz#5343acd3b2246bc1b857ac38be708f070d18809f"
-  integrity sha512-QLo7rzTBOl43FvVqDdq5Ql9IoElIuTdjrz9SKAXCvULvBoRZ44JGSkx9z4999ZusCsb4rK3gjS8gOGyeYqZv2Q==
+eslint-plugin-react-native@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-react-native/-/eslint-plugin-react-native-5.0.0.tgz#2ee990ba4967c557183b31121578547fb5c02d5d"
+  integrity sha512-VyWlyCC/7FC/aONibOwLkzmyKg4j9oI8fzrk9WYNs4I8/m436JuOTAFwLvEn1CVvc7La4cPfbCyspP4OYpP52Q==
   dependencies:
     eslint-plugin-react-native-globals "^0.1.1"
 
@@ -6861,10 +6776,10 @@ flow-api-translator@0.32.0:
     hermes-transform "0.32.0"
     typescript "5.3.2"
 
-flow-bin@^0.289.0:
-  version "0.289.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.289.0.tgz#f6b64db7fc7e77ee3ec2f994339d41d22934fdd5"
-  integrity sha512-xNmTDLq6TkHa3LvNWHF9lcnKmtBlxZstEWXo7p0KXRzrtHNAAWJGDFyidz7E0IEw95VxxjNZhgiTYGDOIAWPPw==
+flow-bin@^0.293.0:
+  version "0.293.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.293.0.tgz#c554b15a2edf587897802696ba553756bf9190cb"
+  integrity sha512-jLE786Qdhq0hu9BDrWGk1h68Ebda76yERhLuaO8TYZIn+x+nkB5Xtld7AZan8a/tproxfz0nD/n8wA4CbPUu9w==
 
 flow-enums-runtime@^0.0.6:
   version "0.0.6"

From 33e79807eb5f0f128284b811ac5eb1809dcce793 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 14:17:17 +0530
Subject: [PATCH 07/14] build fixes

---
 vnext/Folly/Folly.vcxproj                     |   2 +
 .../Fabric/FabricUIManagerModule.cpp          |   5 +-
 .../ReactHost/ReactInstanceWin.cpp            |   1 +
 vnext/ReactCommon/ReactCommon.vcxproj         |   8 +-
 vnext/ReactCommon/ReactCommon.vcxproj.filters |   3 -
 .../react/renderer/core/propsConversions.h    | 199 ++++++++++++++++++
 vnext/Shared/Shared.vcxitems                  |   5 +-
 vnext/Shared/Shared.vcxitems.filters          |   1 -
 vnext/overrides.json                          |   7 +
 9 files changed, 222 insertions(+), 9 deletions(-)
 create mode 100644 vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h

diff --git a/vnext/Folly/Folly.vcxproj b/vnext/Folly/Folly.vcxproj
index 860674001c7..4bf7b6ecdb7 100644
--- a/vnext/Folly/Folly.vcxproj
+++ b/vnext/Folly/Folly.vcxproj
@@ -77,6 +77,8 @@
     <ClCompile Include="$(FollyDir)\folly\ScopeGuard.cpp" />
     <ClCompile Include="$(FollyDir)\folly\Unicode.cpp" />
     <ClCompile Include="$(FollyDir)\folly\memory\detail\MallocImpl.cpp" />
+    <ClCompile Include="$(FollyDir)\folly\memory\SanitizeLeak.cpp" />
+    <ClCompile Include="$(FollyDir)\folly\lang\Exception.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader>Create</PrecompiledHeader>
     </ClCompile>
diff --git a/vnext/Microsoft.ReactNative/Fabric/FabricUIManagerModule.cpp b/vnext/Microsoft.ReactNative/Fabric/FabricUIManagerModule.cpp
index d36245c83a5..c267e020f16 100644
--- a/vnext/Microsoft.ReactNative/Fabric/FabricUIManagerModule.cpp
+++ b/vnext/Microsoft.ReactNative/Fabric/FabricUIManagerModule.cpp
@@ -148,9 +148,8 @@ void FabricUIManager::startSurface(
 
   {
     std::unique_lock lock(m_handlerMutex);
-    auto surfaceHandler = facebook::react::SurfaceHandler{moduleName, surfaceId};
-    surfaceHandler.setContextContainer(m_scheduler->getContextContainer());
-    m_handlerRegistry.emplace(surfaceId, std::move(surfaceHandler));
+    auto [it, _] = m_handlerRegistry.try_emplace(surfaceId, moduleName, surfaceId);
+    it->second.setContextContainer(m_scheduler->getContextContainer());
   }
 
   visit(surfaceId, [&](const facebook::react::SurfaceHandler &surfaceHandler) {
diff --git a/vnext/Microsoft.ReactNative/ReactHost/ReactInstanceWin.cpp b/vnext/Microsoft.ReactNative/ReactHost/ReactInstanceWin.cpp
index 19e19f15a18..1dd189d6fe6 100644
--- a/vnext/Microsoft.ReactNative/ReactHost/ReactInstanceWin.cpp
+++ b/vnext/Microsoft.ReactNative/ReactHost/ReactInstanceWin.cpp
@@ -59,6 +59,7 @@
 #include <react/renderer/componentregistry/native/NativeComponentRegistryBinding.h>
 #include <react/runtime/PlatformTimerRegistry.h>
 #include <react/runtime/TimerManager.h>
+#include <react/runtime/JSRuntimeBindings.h>
 #include <react/threading/MessageQueueThreadImpl.h>
 #include "Inspector/ReactInspectorThread.h"
 
diff --git a/vnext/ReactCommon/ReactCommon.vcxproj b/vnext/ReactCommon/ReactCommon.vcxproj
index bc40fad1969..89c0d29ae98 100644
--- a/vnext/ReactCommon/ReactCommon.vcxproj
+++ b/vnext/ReactCommon/ReactCommon.vcxproj
@@ -146,8 +146,11 @@
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\RuntimeSamplingProfileTraceEventSerializer.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\PerformanceTracer.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\TraceEventSerializer.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\HostTracingProfileSerializer.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\TraceEventGenerator.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\ConsoleTimeStamp.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsitooling\react\runtime\JSRuntimeFactory.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsitooling\react\runtime\JSRuntimeBindings.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\logger\react_native_log.cpp" />
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\reactperflogger\fusebox\FuseboxTracer.cpp" />
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\reactperflogger\reactperflogger\BridgeNativeModulePerfLogger.cpp" />
@@ -191,6 +194,9 @@
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\network\NetworkHandler.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\network\BoundedRequestBuffer.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\network\CdpNetwork.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\ConsoleTaskContext.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\ConsoleTask.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\ConsoleTaskOrchestrator.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\network\HttpUtils.cpp" />
     <ClCompile Include="$(YogaDir)\yoga\event\event.cpp" />
     <ClCompile Include="pch.cpp">
@@ -227,7 +233,7 @@
     <ClInclude Include="$(ReactNativeDir)\ReactCommon\react\renderer\graphics\Rect.h" />
     <ClInclude Include="$(ReactNativeDir)\ReactCommon\react\timing\primitives.h" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\bridging\LongLivedObject.cpp" />
-    <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboCxxModule.cpp" />
+    <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\renderer\core\DynamicPointerEvent.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboModule.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboModuleBinding.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboModuleUtils.cpp" />
diff --git a/vnext/ReactCommon/ReactCommon.vcxproj.filters b/vnext/ReactCommon/ReactCommon.vcxproj.filters
index c11a39f09be..0346135463d 100644
--- a/vnext/ReactCommon/ReactCommon.vcxproj.filters
+++ b/vnext/ReactCommon/ReactCommon.vcxproj.filters
@@ -159,9 +159,6 @@
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\bridging\LongLivedObject.cpp">
       <Filter>turbomodule\core</Filter>
     </ClCompile>
-    <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboCxxModule.cpp">
-      <Filter>turbomodule\core</Filter>
-    </ClCompile>
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\core\ReactCommon\TurboModule.cpp">
       <Filter>turbomodule\core</Filter>
     </ClCompile>
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h
new file mode 100644
index 00000000000..a610527ba7d
--- /dev/null
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+#include <optional>
+
+#include <react/renderer/core/PropsParserContext.h>
+#include <react/renderer/core/RawProps.h>
+#include <react/renderer/core/RawPropsKey.h>
+#include <react/renderer/core/graphicsConversions.h>
+
+namespace facebook::react {
+
+#ifdef RN_SERIALIZABLE_STATE
+
+inline folly::dynamic toDynamic(const std::vector<bool> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+inline folly::dynamic toDynamic(const std::vector<std::string> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto &value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+inline folly::dynamic toDynamic(const std::vector<int> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+inline folly::dynamic toDynamic(const std::vector<double> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+inline folly::dynamic toDynamic(const std::vector<Float> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+inline folly::dynamic toDynamic(const std::vector<folly::dynamic> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (auto &value : arrayValue) {
+    resultArray.push_back(value);
+  }
+  return resultArray;
+}
+
+template <typename T>
+folly::dynamic toDynamic(const std::vector<T> &arrayValue)
+{
+  folly::dynamic resultArray = folly::dynamic::array();
+  for (const auto &value : arrayValue) {
+    resultArray.push_back(toDynamic(value));
+  }
+  return resultArray;
+}
+
+#endif
+
+/**
+ * Use this only when a prop update has definitely been sent from JS;
+ * essentially, cases where rawValue is virtually guaranteed to not be a
+ * nullptr.
+ */
+template <typename T>
+void fromRawValue(const PropsParserContext &context, const RawValue &rawValue, T &result, T defaultValue)
+{
+  if (!rawValue.hasValue()) {
+    result = std::move(defaultValue);
+    return;
+  }
+
+  fromRawValue(context, rawValue, result);
+}
+
+template <typename T>
+void fromRawValue(const PropsParserContext &context, const RawValue &rawValue, T &result)
+{
+  result = (T)rawValue;
+}
+
+template <typename T>
+void fromRawValue(const PropsParserContext &context, const RawValue &rawValue, std::optional<T> &result)
+{
+  T resultValue;
+  fromRawValue(context, rawValue, resultValue);
+  result = std::optional<T>{std::move(resultValue)};
+}
+
+template <typename T>
+void fromRawValue(const PropsParserContext &context, const RawValue &rawValue, std::vector<T> &result)
+{
+  if (rawValue.hasType<std::vector<RawValue>>()) {
+    auto items = (std::vector<RawValue>)rawValue;
+    auto length = items.size();
+    result.clear();
+    result.reserve(length);
+    for (auto &item : items) {
+      T itemResult;
+      fromRawValue(context, item, itemResult);
+      result.push_back(itemResult);
+    }
+    return;
+  }
+
+  // The case where `value` is not an array.
+  result.clear();
+  result.reserve(1);
+  T itemResult;
+  fromRawValue(context, rawValue, itemResult);
+  result.push_back(itemResult);
+}
+
+template <typename T>
+void fromRawValue(const PropsParserContext &context, const RawValue &rawValue, std::vector<std::vector<T>> &result)
+{
+  if (rawValue.hasType<std::vector<std::vector<RawValue>>>()) {
+    auto items = (std::vector<std::vector<RawValue>>)rawValue;
+    auto length = items.size();
+    result.clear();
+    result.reserve(length);
+    for (auto &item : items) {
+      T itemResult;
+      fromRawValue(context, item, itemResult);
+      result.push_back(itemResult);
+    }
+    return;
+  }
+
+  // The case where `value` is not an array.
+  result.clear();
+  result.reserve(1);
+  T itemResult;
+  fromRawValue(context, rawValue, itemResult);
+  result.push_back(itemResult);
+}
+
+template <typename T, typename U = T>
+T convertRawProp(
+    const PropsParserContext &context,
+    const RawProps &rawProps,
+    const char *name,
+    const T &sourceValue,
+    const U &defaultValue,
+    const char *namePrefix = nullptr,
+    const char *nameSuffix = nullptr)
+{
+  const auto *rawValue = rawProps.at(name, namePrefix, nameSuffix);
+  if (rawValue == nullptr) [[likely]] {
+    return sourceValue;
+  }
+
+  // Special case: `null` always means "the prop was removed, use default
+  // value".
+  if (!rawValue->hasValue()) [[unlikely]] {
+    return static_cast<T>(defaultValue); // Windows #15782
+  }
+
+  try {
+    T result;
+    fromRawValue(context, *rawValue, result);
+    return result;
+  } catch (const std::exception &e) {
+    // In case of errors, log the error and fall back to the default
+    RawPropsKey key{.prefix = namePrefix, .name = name, .suffix = nameSuffix};
+    // TODO: report this using ErrorUtils so it's more visible to the user
+    LOG(ERROR) << "Error while converting prop '" << static_cast<std::string>(key) << "': " << e.what();
+    return static_cast<T>(defaultValue);// Windows #15782
+  }
+}
+
+} // namespace facebook::react
diff --git a/vnext/Shared/Shared.vcxitems b/vnext/Shared/Shared.vcxitems
index d5593cfa6c5..99d2284d2d9 100644
--- a/vnext/Shared/Shared.vcxitems
+++ b/vnext/Shared/Shared.vcxitems
@@ -434,7 +434,6 @@
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\TraceEventSerializer.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\ConsoleTimeStamp.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\HostTargetTraceRecording.cpp " />
-    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\TraceRecordingStateSerializer.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\HostTargetTracing.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\react\utils\jsi-utils.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\reactperflogger\reactperflogger\ReactPerfettoLogger.cpp" />
@@ -447,6 +446,10 @@
   </ItemGroup>
   <ItemGroup Condition="'$(UseFabric)' == 'true'">
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\defaults\DefaultTurboModules.cpp" />
+    <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\intersectionobserver\NativeIntersectionObserver.cpp" />
+    <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\renderer\observers\intersection\IntersectionObserver.cpp" DisableSpecificWarnings="4996;%(DisableSpecificWarnings)" />
+    <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\renderer\observers\intersection\IntersectionObserverManager.cpp" DisableSpecificWarnings="4996;%(DisableSpecificWarnings)" />
+    <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\renderer\observers\intersection\IntersectionObserverState.cpp" DisableSpecificWarnings="4996;%(DisableSpecificWarnings)" />
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\microtasks\NativeMicrotasks.cpp" />
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\featureflags\NativeReactNativeFeatureFlags.cpp" />
     <CLCompile Include="$(ReactNativeDir)\ReactCommon\react\nativemodule\dom\NativeDOM.cpp" DisableSpecificWarnings="4715;%(DisableSpecificWarnings)" />
diff --git a/vnext/Shared/Shared.vcxitems.filters b/vnext/Shared/Shared.vcxitems.filters
index 2fb11463145..776454253dc 100644
--- a/vnext/Shared/Shared.vcxitems.filters
+++ b/vnext/Shared/Shared.vcxitems.filters
@@ -296,7 +296,6 @@
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\ConsoleTimeStamp.cpp" />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\HostTargetTraceRecording.cpp " />
     <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\HostTargetTracing.cpp" />
-    <ClCompile Include="$(ReactNativeDir)\ReactCommon\jsinspector-modern\tracing\TraceRecordingStateSerializer.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\Microsoft.ReactNative\Fabric\Composition\CompositionTextProvider.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\Microsoft.ReactNative\Fabric\Composition\CompositionTextRangeProvider.cpp" />
     <ClCompile Include="$(MSBuildThisFileDirectory)..\Microsoft.ReactNative\Fabric\Composition\CompositionAnnotationProvider.cpp" />
diff --git a/vnext/overrides.json b/vnext/overrides.json
index e60b629e70d..ca528a9e15c 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -192,6 +192,13 @@
       "baseFile": "packages/react-native/ReactCommon/react/renderer/components/view/accessibilityPropsConversions.h",
       "baseHash": "72cc422293c0e70f454225476cdabd3458bbce5e"
     },
+    {
+      "type": "patch",
+      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h",
+      "baseFile": "packages/react-native/ReactCommon/react/renderer/core/propsConversions.h",
+      "baseHash": "4b5427c2d17fc9ae2842d56a78db949467411178",
+      "issue": 15782
+    },
     {
       "type": "copy",
       "directory": "ReactCopies/IntegrationTests",

From e999507f1442bac22959fd977a075873c99b99ca Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 14:24:35 +0530
Subject: [PATCH 08/14] Resolve conflicts

---
 vnext/overrides.json | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/vnext/overrides.json b/vnext/overrides.json
index 686d52ef9a6..9c96b0c35a9 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -252,18 +252,6 @@
       "baseFile": "packages/react-native/ReactCommon/react/renderer/components/view/accessibilityPropsConversions.h",
       "baseHash": "72cc422293c0e70f454225476cdabd3458bbce5e"
     },
-    {
-      "type": "patch",
-      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp",
-      "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventDispatcher.cpp",
-      "baseHash": "8585eaca4fa573b0264937db0c6c0b3facc933c8"
-    },
-    {
-      "type": "patch",
-      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp",
-      "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventQueueProcessor.cpp",
-      "baseHash": "01fecdc627c28c20913fa240e153dcc5c376a3e9"
-    },
     {
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h",

From b5d842c3a3c6168671adc430ad80d848275ed4a6 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 15:56:38 +0530
Subject: [PATCH 09/14] lint fix

- KeyUp and KeyDown
---
 .../AccessibilityInfo/AccessibilityInfo.win32.js  |  3 ++-
 .../Components/Pressable/Pressable.win32.js       | 11 ++++++-----
 .../Components/TextInput/TextInput.win32.js       | 10 +++++-----
 .../Libraries/Components/View/View.win32.js       | 10 +++++-----
 .../Components/View/ViewPropTypes.win32.js        |  8 ++++----
 .../Libraries/Pressability/Pressability.win32.js  | 15 ++++++++-------
 .../Libraries/Types/CoreEventTypes.win32.js       | 15 +--------------
 .../examples/Text/TextSharedExamples.windows.js   |  2 +-
 .../Components/Pressable/Pressable.windows.js     | 11 ++++++-----
 .../TextInput/TextInput.flow.windows.js           | 11 ++++++-----
 .../Components/TextInput/TextInput.windows.js     | 11 ++++++-----
 .../Components/View/ViewPropTypes.windows.js      |  8 ++++----
 .../Pressability/Pressability.windows.js          | 15 ++++++++-------
 .../Libraries/Types/CoreEventTypes.windows.js     | 14 +-------------
 14 files changed, 63 insertions(+), 81 deletions(-)

diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
index 65b0abc565c..ef908846b00 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/AccessibilityInfo/AccessibilityInfo.win32.js
@@ -521,9 +521,10 @@ const AccessibilityInfo = {
       NativeAccessibilityInfo?.announceForAccessibility(announcement);
     } else if (Platform.OS === 'win32') {
       if (NativeAccessibilityInfoWin32?.announceForAccessibilityWithOptions) {
+        const {priority: _, ...win32Options} = options;
         NativeAccessibilityInfoWin32?.announceForAccessibilityWithOptions(
           announcement,
-          options,
+          win32Options,
         );
       } else {
         NativeAccessibilityInfoWin32?.announceForAccessibility(announcement);
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Pressable/Pressable.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Pressable/Pressable.win32.js
index ad481e38d9f..7fcadfcf16a 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Pressable/Pressable.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/Pressable/Pressable.win32.js
@@ -16,7 +16,8 @@ import type {
   // [Windows
   BlurEvent,
   FocusEvent,
-  KeyEvent, // Windows]
+  KeyUpEvent,
+  KeyDownEvent, // Windows]
 } from '../../Types/CoreEventTypes';
 
 import type {ViewProps} from '../View/ViewPropTypes';
@@ -141,12 +142,12 @@ type PressableBaseProps = $ReadOnly<{
   /*
    * Called after a key down event is detected.
    */
-  onKeyDown?: ?(event: KeyEvent) => mixed,
+  onKeyDown?: ?(event: KeyDownEvent) => mixed,
 
   /*
    * Called after a key up event is detected.
    */
-  onKeyUp?: ?(event: KeyEvent) => mixed,
+  onKeyUp?: ?(event: KeyUpEvent) => mixed,
 
   /*
    * List of keys handled only by JS.
@@ -161,12 +162,12 @@ type PressableBaseProps = $ReadOnly<{
   /*
    * Called in the tunneling phase after a key up event is detected.
    */
-  onKeyDownCapture?: ?(event: KeyEvent) => void,
+  onKeyDownCapture?: ?(event: KeyDownEvent) => void,
 
   /*
    * Called in the tunneling phase after a key up event is detected.
    */
-  onKeyUpCapture?: ?(event: KeyEvent) => void,
+  onKeyUpCapture?: ?(event: KeyUpEvent) => void,
 
   /**
    * Either view styles or a function that receives a boolean reflecting whether
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/TextInput/TextInput.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/TextInput/TextInput.win32.js
index 5cc7a840896..9e9913ac072 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/TextInput/TextInput.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/TextInput/TextInput.win32.js
@@ -73,7 +73,7 @@ let RCTMultilineTextInputView;
 let RCTMultilineTextInputNativeCommands;
 let WindowsTextInput; // [Windows]
 let WindowsTextInputCommands; // [Windows]
-import type {KeyEvent} from '../../Types/CoreEventTypes'; // [Windows]
+import type {KeyUpEvent, KeyDownEvent} from '../../Types/CoreEventTypes'; // [Windows]
 
 // [Windows
 if (Platform.OS === 'android') {
@@ -651,7 +651,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
   // so omitting onBlur and onFocus pressability handlers here.
   const {onBlur, onFocus, ...eventHandlers} = usePressability(config);
   const eventPhase = Object.freeze({Capturing: 1, Bubbling: 3});
-  const _keyDown = (event: KeyEvent) => {
+  const _keyDown = (event: KeyDownEvent) => {
     const keyDownEvents = props.keyDownEvents;
     if (keyDownEvents != null && event.isPropagationStopped() !== true) {
       for (const el of keyDownEvents) {
@@ -670,7 +670,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyDown && props.onKeyDown(event);
   };
 
-  const _keyUp = (event: KeyEvent) => {
+  const _keyUp = (event: KeyUpEvent) => {
     const keyUpEvents = props.keyUpEvents;
     if (keyUpEvents != null && event.isPropagationStopped() !== true) {
       for (const el of keyUpEvents) {
@@ -689,7 +689,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyUp && props.onKeyUp(event);
   };
 
-  const _keyDownCapture = (event: KeyEvent) => {
+  const _keyDownCapture = (event: KeyDownEvent) => {
     const keyDownEvents = props.keyDownEvents;
     if (keyDownEvents != null && event.isPropagationStopped() !== true) {
       for (const el of keyDownEvents) {
@@ -708,7 +708,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyDownCapture && props.onKeyDownCapture(event);
   };
 
-  const _keyUpCapture = (event: KeyEvent) => {
+  const _keyUpCapture = (event: KeyUpEvent) => {
     const keyUpEvents = props.keyUpEvents;
     if (keyUpEvents != null && event.isPropagationStopped() !== true) {
       for (const el of keyUpEvents) {
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/View.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/View.win32.js
index 89ab51eba34..d881641e46d 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/View.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/View.win32.js
@@ -15,7 +15,7 @@ import ViewNativeComponent from './ViewNativeComponent';
 import * as React from 'react';
 import invariant from 'invariant'; // [Windows]
 // [Windows
-import type {KeyEvent} from '../../Types/CoreEventTypes';
+import type {KeyUpEvent, KeyDownEvent} from '../../Types/CoreEventTypes';
 // Windows]
 
 /**
@@ -111,7 +111,7 @@ const View: component(
           }
         : undefined;
 
-    const _keyDown = (event: KeyEvent) => {
+    const _keyDown = (event: KeyDownEvent) => {
       const keyDownEvents = otherProps.keyDownEvents;
       if (keyDownEvents != null && event.isPropagationStopped() !== true) {
         for (const el of keyDownEvents) {
@@ -130,7 +130,7 @@ const View: component(
       otherProps.onKeyDown && otherProps.onKeyDown(event);
     };
 
-    const _keyUp = (event: KeyEvent) => {
+    const _keyUp = (event: KeyUpEvent) => {
       const keyUpEvents = otherProps.keyUpEvents;
       if (keyUpEvents != null && event.isPropagationStopped() !== true) {
         for (const el of keyUpEvents) {
@@ -149,7 +149,7 @@ const View: component(
       otherProps.onKeyUp && otherProps.onKeyUp(event);
     };
 
-    const _keyDownCapture = (event: KeyEvent) => {
+    const _keyDownCapture = (event: KeyDownEvent) => {
       const keyDownEvents = otherProps.keyDownEvents;
       if (keyDownEvents != null && event.isPropagationStopped() !== true) {
         for (const el of keyDownEvents) {
@@ -168,7 +168,7 @@ const View: component(
       otherProps.onKeyDownCapture && otherProps.onKeyDownCapture(event);
     };
 
-    const _keyUpCapture = (event: KeyEvent) => {
+    const _keyUpCapture = (event: KeyUpEvent) => {
       const keyUpEvents = otherProps.keyUpEvents;
       if (keyUpEvents != null && event.isPropagationStopped() !== true) {
         for (const el of keyUpEvents) {
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
index b7e13c043c3..9121459dc55 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Components/View/ViewPropTypes.win32.js
@@ -548,12 +548,12 @@ type ViewPropsWindows = $ReadOnly<{|
    *
    * @platform windows
    */
-  onKeyUp?: ?(e: KeyEvent) => void,
-  onKeyUpCapture?: ?(e: KeyEvent) => void,
+  onKeyUp?: ?(e: KeyUpEvent) => void,
+  onKeyUpCapture?: ?(e: KeyUpEvent) => void,
   keyUpEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
 
-  onKeyDown?: ?(e: KeyEvent) => void,
-  onKeyDownCapture?: ?(e: KeyEvent) => void,
+  onKeyDown?: ?(e: KeyDownEvent) => void,
+  onKeyDownCapture?: ?(e: KeyDownEvent) => void,
   keyDownEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
   /**
    * Specifies the Tooltip for the view
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Pressability/Pressability.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Pressability/Pressability.win32.js
index 69e1e0dbd36..add3d0dda6c 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Pressability/Pressability.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Pressability/Pressability.win32.js
@@ -12,7 +12,8 @@ import type {HostInstance} from '../../src/private/types/HostInstance';
 import type {
   BlurEvent,
   FocusEvent,
-  KeyEvent, // [Windows]
+  KeyUpEvent, // [Windows]
+  KeyDownEvent, // [Windows]
   GestureResponderEvent,
   MouseEvent,
 } from '../Types/CoreEventTypes';
@@ -99,12 +100,12 @@ export type PressabilityConfig = $ReadOnly<{
   /*
    * Called after a key down event is detected.
    */
-  onKeyDown?: ?(event: KeyEvent) => mixed,
+  onKeyDown?: ?(event: KeyDownEvent) => mixed,
 
   /*
    * Called after a key up event is detected.
    */
-  onKeyUp?: ?(event: KeyEvent) => mixed,
+  onKeyUp?: ?(event: KeyUpEvent) => mixed,
 
   /**
    * Called when the hover is activated to provide visual feedback.
@@ -179,8 +180,8 @@ export type EventHandlers = $ReadOnly<{
   onResponderTerminationRequest: () => boolean,
   onStartShouldSetResponder: () => boolean,
   // [Windows
-  onKeyUp: (event: KeyEvent) => void,
-  onKeyDown: (event: KeyEvent) => void,
+  onKeyUp: (event: KeyUpEvent) => void,
+  onKeyDown: (event: KeyDownEvent) => void,
   // Windows]
 }>;
 
@@ -591,7 +592,7 @@ export default class Pressability {
 
     // [Windows
     const keyboardEventHandlers = {
-      onKeyUp: (event: KeyEvent): void => {
+      onKeyUp: (event: KeyUpEvent): void => {
         const {onKeyUp} = this._config;
         onKeyUp && onKeyUp(event);
 
@@ -611,7 +612,7 @@ export default class Pressability {
         // Native windows app clears the key pressed state when another key press interrupts the current
         this._isKeyDown = false;
       },
-      onKeyDown: (event: KeyEvent): void => {
+      onKeyDown: (event: KeyDownEvent): void => {
         const {onKeyDown} = this._config;
         onKeyDown && onKeyDown(event);
 
diff --git a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
index c00625bb07b..0335a1cc4b8 100644
--- a/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
+++ b/packages/@office-iss/react-native-win32/src-win/Libraries/Types/CoreEventTypes.win32.js
@@ -387,22 +387,9 @@ export type KeyEvent = $ReadOnly<{
    * @see https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent/isComposing
    */
   isComposing?: boolean,
+  eventPhase: number, //Windows
 }>;
 
 export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;
 
 export type KeyDownEvent = NativeSyntheticEvent<KeyEvent>;
-
-// [Windows
-export type KeyEvent = NativeSyntheticEvent<
-  $ReadOnly<{|
-    altKey: boolean,
-    ctrlKey: boolean,
-    metaKey: boolean,
-    shiftKey: boolean,
-    key: string,
-    code: string,
-    eventPhase: number,
-  |}>,
->;
-// Windows]
diff --git a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
index 68f85a2ce60..908c636ce30 100644
--- a/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
+++ b/packages/@react-native-windows/tester/src/js/examples/Text/TextSharedExamples.windows.js
@@ -197,7 +197,7 @@ function RtlAndInlineViewsExample(): React.Node {
   );
 }
 
-component TextWithLinkRoleExample() {
+function TextWithLinkRoleExample(): React.Node {
   const handlePress = () => console.log('Link Press');
 
   return (
diff --git a/vnext/src-win/Libraries/Components/Pressable/Pressable.windows.js b/vnext/src-win/Libraries/Components/Pressable/Pressable.windows.js
index 1fef2318463..bff1821662f 100644
--- a/vnext/src-win/Libraries/Components/Pressable/Pressable.windows.js
+++ b/vnext/src-win/Libraries/Components/Pressable/Pressable.windows.js
@@ -16,7 +16,8 @@ import type {
   // [Windows
   BlurEvent,
   FocusEvent,
-  KeyEvent, // Windows]
+  KeyUpEvent, // Windows]
+  KeyDownEvent, // Windows]
 } from '../../Types/CoreEventTypes';
 import type {ViewProps} from '../View/ViewPropTypes';
 
@@ -148,12 +149,12 @@ type PressableBaseProps = $ReadOnly<{
   /*
    * Called after a key down event is detected.
    */
-  onKeyDown?: ?(event: KeyEvent) => mixed,
+  onKeyDown?: ?(event: KeyDownEvent) => mixed,
 
   /*
    * Called after a key up event is detected.
    */
-  onKeyUp?: ?(event: KeyEvent) => mixed,
+  onKeyUp?: ?(event: KeyUpEvent) => mixed,
 
   /*
    * List of keys handled only by JS.
@@ -168,12 +169,12 @@ type PressableBaseProps = $ReadOnly<{
   /*
    * Called in the tunneling phase after a key up event is detected.
    */
-  onKeyDownCapture?: ?(event: KeyEvent) => void,
+  onKeyDownCapture?: ?(event: KeyDownEvent) => void,
 
   /*
    * Called in the tunneling phase after a key up event is detected.
    */
-  onKeyUpCapture?: ?(event: KeyEvent) => void,
+  onKeyUpCapture?: ?(event: KeyUpEvent) => void,
 
   /**
    * Either view styles or a function that receives a boolean reflecting whether
diff --git a/vnext/src-win/Libraries/Components/TextInput/TextInput.flow.windows.js b/vnext/src-win/Libraries/Components/TextInput/TextInput.flow.windows.js
index ab36080061a..a4c4ddad820 100644
--- a/vnext/src-win/Libraries/Components/TextInput/TextInput.flow.windows.js
+++ b/vnext/src-win/Libraries/Components/TextInput/TextInput.flow.windows.js
@@ -15,7 +15,8 @@ import type {
   GestureResponderEvent,
   NativeSyntheticEvent,
   ScrollEvent,
-  KeyEvent, // Windows
+  KeyUpEvent, // Windows
+  KeyDownEvent, // Windows
   MouseEvent, // Windows
 } from '../../Types/CoreEventTypes';
 import type {ViewProps} from '../View/ViewPropTypes';
@@ -564,10 +565,10 @@ export type TextInputWindowsProps = $ReadOnly<{|
    */
   onMouseEnter?: (args: MouseEvent) => void,
 
-  onKeyDown?: (args: KeyEvent) => void,
-  onKeyDownCapture?: (args: KeyEvent) => void,
-  onKeyUp?: (args: KeyEvent) => void,
-  onKeyUpCapture?: (args: KeyEvent) => void,
+  onKeyDown?: (args: KeyDownEvent) => void,
+  onKeyDownCapture?: (args: KeyDownEvent) => void,
+  onKeyUp?: (args: KeyUpEvent) => void,
+  onKeyUpCapture?: (args: KeyDownEvent) => void,
 
   keyDownEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
   keyUpEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
diff --git a/vnext/src-win/Libraries/Components/TextInput/TextInput.windows.js b/vnext/src-win/Libraries/Components/TextInput/TextInput.windows.js
index 65dfae2eb75..d55b13d6eba 100644
--- a/vnext/src-win/Libraries/Components/TextInput/TextInput.windows.js
+++ b/vnext/src-win/Libraries/Components/TextInput/TextInput.windows.js
@@ -13,7 +13,8 @@ import type {____TextStyle_Internal as TextStyleInternal} from '../../StyleSheet
 import type {
   BlurEvent,
   FocusEvent,
-  KeyEvent, // Windows
+  KeyUpEvent, // Windows
+  KeyDownEvent, // Windows
   MouseEvent, // Windows
   GestureResponderEvent,
   ScrollEvent,
@@ -661,7 +662,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
   // so omitting onBlur and onFocus pressability handlers here.
   const {onBlur, onFocus, ...eventHandlers} = usePressability(config);
   const eventPhase = Object.freeze({Capturing: 1, Bubbling: 3});
-  const _keyDown = (event: KeyEvent) => {
+  const _keyDown = (event: KeyDownEvent) => {
     if (props.keyDownEvents && event.isPropagationStopped() !== true) {
       // $FlowFixMe[incompatible-type] - keyDownEvents was already checked to not be undefined
       for (const el of props.keyDownEvents) {
@@ -680,7 +681,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyDown && props.onKeyDown(event);
   };
 
-  const _keyUp = (event: KeyEvent) => {
+  const _keyUp = (event: KeyUpEvent) => {
     if (props.keyUpEvents && event.isPropagationStopped() !== true) {
       // $FlowFixMe[incompatible-type] - keyUpEvents was already checked to not be undefined
       for (const el of props.keyUpEvents) {
@@ -699,7 +700,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyUp && props.onKeyUp(event);
   };
 
-  const _keyDownCapture = (event: KeyEvent) => {
+  const _keyDownCapture = (event: KeyDownEvent) => {
     if (props.keyDownEvents && event.isPropagationStopped() !== true) {
       // $FlowFixMe[incompatible-type] - keyDownEvents was already checked to not be undefined
       for (const el of props.keyDownEvents) {
@@ -718,7 +719,7 @@ function InternalTextInput(props: TextInputProps): React.Node {
     props.onKeyDownCapture && props.onKeyDownCapture(event);
   };
 
-  const _keyUpCapture = (event: KeyEvent) => {
+  const _keyUpCapture = (event: KeyUpEvent) => {
     if (props.keyUpEvents && event.isPropagationStopped() !== true) {
       // $FlowFixMe[incompatible-type] - keyUpEvents was already checked to not be undefined
       for (const el of props.keyUpEvents) {
diff --git a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
index 65259523ef9..01591d0c342 100644
--- a/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
+++ b/vnext/src-win/Libraries/Components/View/ViewPropTypes.windows.js
@@ -441,12 +441,12 @@ type ViewPropsWindows = $ReadOnly<{|
    *
    * @platform windows
    */
-  onKeyUp?: ?(e: KeyEvent) => void,
-  onKeyUpCapture?: ?(e: KeyEvent) => void,
+  onKeyUp?: ?(e: KeyUpEvent) => void,
+  onKeyUpCapture?: ?(e: KeyUpEvent) => void,
   keyUpEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
 
-  onKeyDown?: ?(e: KeyEvent) => void,
-  onKeyDownCapture?: ?(e: KeyEvent) => void,
+  onKeyDown?: ?(e: KeyDownEvent) => void,
+  onKeyDownCapture?: ?(e: KeyDownEvent) => void,
   keyDownEvents?: ?$ReadOnlyArray<HandledKeyboardEvent>,
   /**
    * Specifies the Tooltip for the view
diff --git a/vnext/src-win/Libraries/Pressability/Pressability.windows.js b/vnext/src-win/Libraries/Pressability/Pressability.windows.js
index 8672de56917..bcc36404cb2 100644
--- a/vnext/src-win/Libraries/Pressability/Pressability.windows.js
+++ b/vnext/src-win/Libraries/Pressability/Pressability.windows.js
@@ -14,7 +14,8 @@ import type {
   FocusEvent,
   GestureResponderEvent,
   MouseEvent,
-  KeyEvent, // [Windows]
+  KeyDownEvent, // [Windows]
+  KeyUpEvent, // [Windows]
 } from '../Types/CoreEventTypes';
 
 import * as ReactNativeFeatureFlags from '../../src/private/featureflags/ReactNativeFeatureFlags';
@@ -99,12 +100,12 @@ export type PressabilityConfig = $ReadOnly<{
   /*
    * Called after a key down event is detected.
    */
-  onKeyDown?: ?(event: KeyEvent) => mixed,
+  onKeyDown?: ?(event: KeyDownEvent) => mixed,
 
   /*
    * Called after a key up event is detected.
    */
-  onKeyUp?: ?(event: KeyEvent) => mixed,
+  onKeyUp?: ?(event: KeyUpEvent) => mixed,
 
   /**
    * Called when the hover is activated to provide visual feedback.
@@ -179,8 +180,8 @@ export type EventHandlers = $ReadOnly<{
   onResponderTerminationRequest: () => boolean,
   onStartShouldSetResponder: () => boolean,
   // [Windows
-  onKeyUp: (event: KeyEvent) => void,
-  onKeyDown: (event: KeyEvent) => void,
+  onKeyUp: (event: KeyUpEvent) => void,
+  onKeyDown: (event: KeyDownEvent) => void,
   // Windows]
 }>;
 
@@ -591,7 +592,7 @@ export default class Pressability {
 
     // [Windows
     const keyboardEventHandlers = {
-      onKeyUp: (event: KeyEvent): void => {
+      onKeyUp: (event: KeyUpEvent): void => {
         const {onKeyUp} = this._config;
         onKeyUp && onKeyUp(event);
 
@@ -611,7 +612,7 @@ export default class Pressability {
         // Native windows app clears the key pressed state when another key press interrupts the current
         this._isKeyDown = false;
       },
-      onKeyDown: (event: KeyEvent): void => {
+      onKeyDown: (event: KeyDownEvent): void => {
         const {onKeyDown, disabled} = this._config;
         onKeyDown && onKeyDown(event);
 
diff --git a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
index e07ba60bf57..b44b45c90b6 100644
--- a/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
+++ b/vnext/src-win/Libraries/Types/CoreEventTypes.windows.js
@@ -357,19 +357,6 @@ export type MouseEvent = NativeSyntheticEvent<
 >;
 // Windows]
 
-// [Windows
-export type KeyEvent = NativeSyntheticEvent<
-  $ReadOnly<{
-    altKey: boolean,
-    ctrlKey: boolean,
-    metaKey: boolean,
-    shiftKey: boolean,
-    key: string,
-    code: string,
-    eventPhase: number,
-  }>,
->;
-// Windows]
 export type KeyEvent = $ReadOnly<{
   /**
    * The actual key that was pressed. For example, F would be "f" or "F" depending on the shift key.
@@ -395,6 +382,7 @@ export type KeyEvent = $ReadOnly<{
    * @see https://developer.mozilla.org/en-US/docs/Web/API/CompositionEvent/isComposing
    */
   isComposing?: boolean,
+  eventPhase: number, // Windows
 }>;
 
 export type KeyUpEvent = NativeSyntheticEvent<KeyEvent>;

From be2904731c6709915477e8dd5f71de90ab28a33c Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Wed, 18 Mar 2026 15:57:56 +0530
Subject: [PATCH 10/14] Change files

---
 ...-native-win32-5e01cc9c-ddbe-4c53-b1cc-f1a0bdac4ff5.json | 7 +++++++
 ...ation-channel-422d4c62-1e0d-461f-ba66-d5ba84f1b9af.json | 7 +++++++
 ...ndows-codegen-8f8cae0d-6365-4803-895a-3db0aaec8e3b.json | 7 +++++++
 ...ative-windows-fb7cd507-5c0d-4772-bd5a-77311cf5371e.json | 7 +++++++
 4 files changed, 28 insertions(+)
 create mode 100644 change/@office-iss-react-native-win32-5e01cc9c-ddbe-4c53-b1cc-f1a0bdac4ff5.json
 create mode 100644 change/@react-native-windows-automation-channel-422d4c62-1e0d-461f-ba66-d5ba84f1b9af.json
 create mode 100644 change/@react-native-windows-codegen-8f8cae0d-6365-4803-895a-3db0aaec8e3b.json
 create mode 100644 change/react-native-windows-fb7cd507-5c0d-4772-bd5a-77311cf5371e.json

diff --git a/change/@office-iss-react-native-win32-5e01cc9c-ddbe-4c53-b1cc-f1a0bdac4ff5.json b/change/@office-iss-react-native-win32-5e01cc9c-ddbe-4c53-b1cc-f1a0bdac4ff5.json
new file mode 100644
index 00000000000..216b7708422
--- /dev/null
+++ b/change/@office-iss-react-native-win32-5e01cc9c-ddbe-4c53-b1cc-f1a0bdac4ff5.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@office-iss/react-native-win32",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-automation-channel-422d4c62-1e0d-461f-ba66-d5ba84f1b9af.json b/change/@react-native-windows-automation-channel-422d4c62-1e0d-461f-ba66-d5ba84f1b9af.json
new file mode 100644
index 00000000000..9bc0f256c6a
--- /dev/null
+++ b/change/@react-native-windows-automation-channel-422d4c62-1e0d-461f-ba66-d5ba84f1b9af.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/automation-channel",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-codegen-8f8cae0d-6365-4803-895a-3db0aaec8e3b.json b/change/@react-native-windows-codegen-8f8cae0d-6365-4803-895a-3db0aaec8e3b.json
new file mode 100644
index 00000000000..18bb1e84216
--- /dev/null
+++ b/change/@react-native-windows-codegen-8f8cae0d-6365-4803-895a-3db0aaec8e3b.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/codegen",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/react-native-windows-fb7cd507-5c0d-4772-bd5a-77311cf5371e.json b/change/react-native-windows-fb7cd507-5c0d-4772-bd5a-77311cf5371e.json
new file mode 100644
index 00000000000..6bb3c191035
--- /dev/null
+++ b/change/react-native-windows-fb7cd507-5c0d-4772-bd5a-77311cf5371e.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "react-native-windows",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

From 74d406cb7ac7c02720fe2c2261b7cf9ae373f3cd Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Thu, 19 Mar 2026 14:03:39 +0530
Subject: [PATCH 11/14] Add removed overrides

---
 .../react-native-win32-tester/package.json    |  2 +-
 .../react-native-win32/package.json           | 14 +++++++------
 .../automation-channel/package.json           |  6 +++---
 .../automation-commands/package.json          |  2 +-
 .../automation/package.json                   |  2 +-
 .../@react-native-windows/cli/package.json    |  2 +-
 .../codegen/package.json                      |  2 +-
 .../find-repo-root/package.json               |  2 +-
 .../@react-native-windows/fs/package.json     |  2 +-
 .../package-utils/package.json                |  2 +-
 .../perf-testing/package.json                 |  4 ++--
 .../telemetry/package.json                    |  2 +-
 .../@react-native-windows/tester/package.json |  6 +++---
 packages/@react-native/monorepo/package.json  |  2 +-
 .../babel-node-config/package.json            |  2 +-
 .../babel-react-native-config/package.json    |  4 ++--
 .../beachball-config/package.json             |  2 +-
 .../create-github-releases/package.json       |  2 +-
 packages/@rnw-scripts/doxysaurus/package.json |  2 +-
 .../@rnw-scripts/eslint-config/package.json   |  4 ++--
 .../@rnw-scripts/format-files/package.json    |  2 +-
 .../@rnw-scripts/integrate-rn/package.json    |  4 ++--
 .../jest-debug-config/package.json            |  2 +-
 .../@rnw-scripts/jest-e2e-config/package.json |  2 +-
 .../package.json                              |  2 +-
 .../jest-out-of-tree-resolver/package.json    |  2 +-
 .../jest-unittest-config/package.json         |  2 +-
 .../metro-dev-config/package.json             |  4 ++--
 .../@rnw-scripts/prepare-release/package.json |  2 +-
 .../@rnw-scripts/promote-release/package.json |  2 +-
 .../@rnw-scripts/stamp-version/package.json   |  2 +-
 .../@rnw-scripts/take-screenshot/package.json |  2 +-
 packages/e2e-test-app-fabric/package.json     |  8 +++----
 packages/playground/package.json              |  8 +++----
 .../package.json                              |  2 +-
 .../react-native-windows-init/package.json    |  2 +-
 packages/sample-app-fabric/package.json       |  4 ++--
 packages/sample-custom-component/package.json |  4 ++--
 vnext/overrides.json                          | 12 +++++++++++
 vnext/package.json                            | 16 +++++++-------
 yarn.lock                                     | 21 +++++++------------
 41 files changed, 91 insertions(+), 80 deletions(-)

diff --git a/packages/@office-iss/react-native-win32-tester/package.json b/packages/@office-iss/react-native-win32-tester/package.json
index d4259e23363..15f2334e042 100644
--- a/packages/@office-iss/react-native-win32-tester/package.json
+++ b/packages/@office-iss/react-native-win32-tester/package.json
@@ -37,4 +37,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@office-iss/react-native-win32/package.json b/packages/@office-iss/react-native-win32/package.json
index 3b58d76a888..32ef7ec74e2 100644
--- a/packages/@office-iss/react-native-win32/package.json
+++ b/packages/@office-iss/react-native-win32/package.json
@@ -49,11 +49,12 @@
     "event-target-shim": "^5.0.1",
     "flow-enums-runtime": "^0.0.6",
     "glob": "^7.1.1",
+    "hermes-compiler": "0.14.0-commitly-202512102158-39fca9fda",
     "invariant": "^2.2.4",
     "jest-environment-node": "^29.7.0",
     "memoize-one": "^5.0.0",
-    "metro-runtime": "^0.83.1",
-    "metro-source-map": "^0.83.1",
+    "metro-runtime": "^0.83.3",
+    "metro-source-map": "^0.83.3",
     "mkdirp": "^0.5.1",
     "nullthrows": "^1.1.1",
     "pretty-format": "^29.7.0",
@@ -62,11 +63,12 @@
     "react-devtools-core": "^6.1.5",
     "react-refresh": "^0.14.0",
     "regenerator-runtime": "^0.13.2",
-    "scheduler": "0.26.0",
+    "scheduler": "0.27.0",
     "semver": "^7.1.3",
     "stacktrace-parser": "^0.1.10",
+    "tinyglobby": "^0.2.15",
     "whatwg-fetch": "^3.0.0",
-    "ws": "^6.2.3",
+    "ws": "^7.5.10",
     "yargs": "^17.6.2"
   },
   "devDependencies": {
@@ -87,7 +89,7 @@
     "flow-bin": "^0.293.0",
     "jscodeshift": "^0.14.0",
     "just-scripts": "^1.3.3",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "react": "19.2.0",
     "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
@@ -125,4 +127,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@react-native-windows/automation-channel/package.json b/packages/@react-native-windows/automation-channel/package.json
index 7267e2a5a5d..aa15d20f9a3 100644
--- a/packages/@react-native-windows/automation-channel/package.json
+++ b/packages/@react-native-windows/automation-channel/package.json
@@ -19,8 +19,8 @@
   "dependencies": {
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
-    "minimatch": "^10.0.3",
-    "jsonrpc-lite": "^2.2.0"
+    "jsonrpc-lite": "^2.2.0",
+    "minimatch": "^10.0.3"
   },
   "devDependencies": {
     "@react-native-community/cli": "20.0.0",
@@ -31,7 +31,7 @@
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
     "just-scripts": "^1.3.2",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "react": "19.2.0",
     "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-windows": "^0.0.0-canary.1037",
diff --git a/packages/@react-native-windows/automation-commands/package.json b/packages/@react-native-windows/automation-commands/package.json
index f2d716d86ae..721efcfa1e2 100644
--- a/packages/@react-native-windows/automation-commands/package.json
+++ b/packages/@react-native-windows/automation-commands/package.json
@@ -30,7 +30,7 @@
     "@types/jest": "^29.2.2",
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@react-native-windows/automation/package.json b/packages/@react-native-windows/automation/package.json
index 282fa74f453..0c6dccc0a4a 100644
--- a/packages/@react-native-windows/automation/package.json
+++ b/packages/@react-native-windows/automation/package.json
@@ -37,7 +37,7 @@
     "@types/node": "^22.14.0",
     "@types/readline-sync": "^1.4.4",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
diff --git a/packages/@react-native-windows/cli/package.json b/packages/@react-native-windows/cli/package.json
index 0c0bdf76e2e..eaab4851d94 100644
--- a/packages/@react-native-windows/cli/package.json
+++ b/packages/@react-native-windows/cli/package.json
@@ -62,7 +62,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
diff --git a/packages/@react-native-windows/codegen/package.json b/packages/@react-native-windows/codegen/package.json
index bbfb7e5370f..fbd83df9e58 100644
--- a/packages/@react-native-windows/codegen/package.json
+++ b/packages/@react-native-windows/codegen/package.json
@@ -44,7 +44,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
diff --git a/packages/@react-native-windows/find-repo-root/package.json b/packages/@react-native-windows/find-repo-root/package.json
index 7cbbfc188e2..f577ec18529 100644
--- a/packages/@react-native-windows/find-repo-root/package.json
+++ b/packages/@react-native-windows/find-repo-root/package.json
@@ -29,7 +29,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "beachball": {
diff --git a/packages/@react-native-windows/fs/package.json b/packages/@react-native-windows/fs/package.json
index adef6cc018c..d9ac22ef798 100644
--- a/packages/@react-native-windows/fs/package.json
+++ b/packages/@react-native-windows/fs/package.json
@@ -29,7 +29,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@react-native-windows/package-utils/package.json b/packages/@react-native-windows/package-utils/package.json
index d557e5b935a..463f77abbba 100644
--- a/packages/@react-native-windows/package-utils/package.json
+++ b/packages/@react-native-windows/package-utils/package.json
@@ -31,7 +31,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "beachball": {
diff --git a/packages/@react-native-windows/perf-testing/package.json b/packages/@react-native-windows/perf-testing/package.json
index 9472309a8a4..66bbaf9865a 100644
--- a/packages/@react-native-windows/perf-testing/package.json
+++ b/packages/@react-native-windows/perf-testing/package.json
@@ -31,13 +31,13 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
     "jest": ">=29.0.3",
     "react": ">=18.0.0",
-    "react-native": ">=0.72.0",
+    "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-test-renderer": ">=18.0.0"
   },
   "peerDependenciesMeta": {
diff --git a/packages/@react-native-windows/telemetry/package.json b/packages/@react-native-windows/telemetry/package.json
index d1498f7e4ea..702d6c7ed6f 100644
--- a/packages/@react-native-windows/telemetry/package.json
+++ b/packages/@react-native-windows/telemetry/package.json
@@ -44,7 +44,7 @@
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
     "lookpath": "^1.2.1",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "semver": "^7.6.3",
     "typescript": "5.0.4"
   },
diff --git a/packages/@react-native-windows/tester/package.json b/packages/@react-native-windows/tester/package.json
index 0b1f36254eb..a113ce16a62 100644
--- a/packages/@react-native-windows/tester/package.json
+++ b/packages/@react-native-windows/tester/package.json
@@ -11,10 +11,10 @@
     "validate-overrides": "react-native-platform-override validate"
   },
   "dependencies": {
+    "@rnw-scripts/sample-custom-component": "0.0.1",
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
-    "flow-enums-runtime": "^0.0.6",
-    "@rnw-scripts/sample-custom-component": "0.0.1"
+    "flow-enums-runtime": "^0.0.6"
   },
   "peerDependencies": {
     "@react-native-picker/picker": "2.11.0",
@@ -41,4 +41,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@react-native/monorepo/package.json b/packages/@react-native/monorepo/package.json
index 6918d4da60e..aef3c7cccbd 100644
--- a/packages/@react-native/monorepo/package.json
+++ b/packages/@react-native/monorepo/package.json
@@ -94,8 +94,8 @@
     "markdownlint-rule-relative-links": "^3.0.0",
     "memfs": "^4.38.2",
     "metro-babel-register": "^0.83.3",
-    "metro-transform-plugins": "^0.83.3",
     "metro-memory-fs": "^0.82.4",
+    "metro-transform-plugins": "^0.83.3",
     "micromatch": "^4.0.4",
     "node-fetch": "^2.2.0",
     "nullthrows": "^1.1.1",
diff --git a/packages/@rnw-scripts/babel-node-config/package.json b/packages/@rnw-scripts/babel-node-config/package.json
index 42a73fda5ff..5ffef98a063 100644
--- a/packages/@rnw-scripts/babel-node-config/package.json
+++ b/packages/@rnw-scripts/babel-node-config/package.json
@@ -17,7 +17,7 @@
     "@babel/preset-typescript": "^7.21.0",
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "peerDependencies": {
     "@babel/core": "^7.22.0",
diff --git a/packages/@rnw-scripts/babel-react-native-config/package.json b/packages/@rnw-scripts/babel-react-native-config/package.json
index 269cda256e2..8d3525797fb 100644
--- a/packages/@rnw-scripts/babel-react-native-config/package.json
+++ b/packages/@rnw-scripts/babel-react-native-config/package.json
@@ -18,9 +18,9 @@
     "@babel/core": "^7.25.2",
     "@react-native/babel-preset": "0.84.0-nightly-20251212-dd390dbbe",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@rnw-scripts/beachball-config/package.json b/packages/@rnw-scripts/beachball-config/package.json
index db221212444..c0810bcf5aa 100644
--- a/packages/@rnw-scripts/beachball-config/package.json
+++ b/packages/@rnw-scripts/beachball-config/package.json
@@ -30,7 +30,7 @@
     "@types/shell-quote": "^1.7.5",
     "beachball": "^2.20.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "shell-quote": "^1.8.1",
     "typescript": "5.0.4"
   },
diff --git a/packages/@rnw-scripts/create-github-releases/package.json b/packages/@rnw-scripts/create-github-releases/package.json
index 42803dac7f9..a94a161b1ff 100644
--- a/packages/@rnw-scripts/create-github-releases/package.json
+++ b/packages/@rnw-scripts/create-github-releases/package.json
@@ -44,7 +44,7 @@
     "@types/semver": "^7.3.3",
     "@types/yargs": "^16.0.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/doxysaurus/package.json b/packages/@rnw-scripts/doxysaurus/package.json
index a32f8661cf3..8606468078e 100644
--- a/packages/@rnw-scripts/doxysaurus/package.json
+++ b/packages/@rnw-scripts/doxysaurus/package.json
@@ -49,7 +49,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/eslint-config/package.json b/packages/@rnw-scripts/eslint-config/package.json
index bec290eda0f..160bdfac560 100644
--- a/packages/@rnw-scripts/eslint-config/package.json
+++ b/packages/@rnw-scripts/eslint-config/package.json
@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "peerDependencies": {
     "eslint": "*",
@@ -29,4 +29,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@rnw-scripts/format-files/package.json b/packages/@rnw-scripts/format-files/package.json
index 19a48f59acb..fc732d5736d 100644
--- a/packages/@rnw-scripts/format-files/package.json
+++ b/packages/@rnw-scripts/format-files/package.json
@@ -33,7 +33,7 @@
     "@types/async": "^3.2.5",
     "@types/node": "^22.14.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/integrate-rn/package.json b/packages/@rnw-scripts/integrate-rn/package.json
index d04b89a0a9d..3ccbdc40791 100644
--- a/packages/@rnw-scripts/integrate-rn/package.json
+++ b/packages/@rnw-scripts/integrate-rn/package.json
@@ -52,7 +52,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
@@ -62,4 +62,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@rnw-scripts/jest-debug-config/package.json b/packages/@rnw-scripts/jest-debug-config/package.json
index d66f9f442bb..70607a4ec05 100644
--- a/packages/@rnw-scripts/jest-debug-config/package.json
+++ b/packages/@rnw-scripts/jest-debug-config/package.json
@@ -19,7 +19,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "peerDependencies": {
     "babel-jest": "^29.3.0",
diff --git a/packages/@rnw-scripts/jest-e2e-config/package.json b/packages/@rnw-scripts/jest-e2e-config/package.json
index 120bc8043bd..0ce0d129029 100644
--- a/packages/@rnw-scripts/jest-e2e-config/package.json
+++ b/packages/@rnw-scripts/jest-e2e-config/package.json
@@ -19,7 +19,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "peerDependencies": {
     "babel-jest": "^29.3.0",
diff --git a/packages/@rnw-scripts/jest-out-of-snapshot-resolver/package.json b/packages/@rnw-scripts/jest-out-of-snapshot-resolver/package.json
index 98b36db14fb..9647cf80af9 100644
--- a/packages/@rnw-scripts/jest-out-of-snapshot-resolver/package.json
+++ b/packages/@rnw-scripts/jest-out-of-snapshot-resolver/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "@rnw-scripts/eslint-config": "1.2.38",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "engines": {
     "node": ">= 22"
diff --git a/packages/@rnw-scripts/jest-out-of-tree-resolver/package.json b/packages/@rnw-scripts/jest-out-of-tree-resolver/package.json
index 031f5f94ddb..4a6069548d7 100644
--- a/packages/@rnw-scripts/jest-out-of-tree-resolver/package.json
+++ b/packages/@rnw-scripts/jest-out-of-tree-resolver/package.json
@@ -15,7 +15,7 @@
   "devDependencies": {
     "@rnw-scripts/eslint-config": "1.2.38",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "engines": {
     "node": ">= 22"
diff --git a/packages/@rnw-scripts/jest-unittest-config/package.json b/packages/@rnw-scripts/jest-unittest-config/package.json
index d1d176c733f..e69b7734644 100644
--- a/packages/@rnw-scripts/jest-unittest-config/package.json
+++ b/packages/@rnw-scripts/jest-unittest-config/package.json
@@ -19,7 +19,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "peerDependencies": {
     "babel-jest": "^29.3.0",
diff --git a/packages/@rnw-scripts/metro-dev-config/package.json b/packages/@rnw-scripts/metro-dev-config/package.json
index 1d89ce4598b..9b9a7a519b0 100644
--- a/packages/@rnw-scripts/metro-dev-config/package.json
+++ b/packages/@rnw-scripts/metro-dev-config/package.json
@@ -28,9 +28,9 @@
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/just-task": "2.3.58",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8"
+    "prettier": "^3.6.2"
   },
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/@rnw-scripts/prepare-release/package.json b/packages/@rnw-scripts/prepare-release/package.json
index 065835f4adb..3fabb757c76 100644
--- a/packages/@rnw-scripts/prepare-release/package.json
+++ b/packages/@rnw-scripts/prepare-release/package.json
@@ -33,7 +33,7 @@
     "@typescript-eslint/eslint-plugin": "^7.1.1",
     "@typescript-eslint/parser": "^7.1.1",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/promote-release/package.json b/packages/@rnw-scripts/promote-release/package.json
index 52cac8a12a2..6c148d7b63b 100644
--- a/packages/@rnw-scripts/promote-release/package.json
+++ b/packages/@rnw-scripts/promote-release/package.json
@@ -38,7 +38,7 @@
     "@types/node": "^22.14.0",
     "@types/yargs": "^16.0.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/stamp-version/package.json b/packages/@rnw-scripts/stamp-version/package.json
index 1659d3aa0b7..c5ceb90b7fe 100644
--- a/packages/@rnw-scripts/stamp-version/package.json
+++ b/packages/@rnw-scripts/stamp-version/package.json
@@ -37,7 +37,7 @@
     "@types/yargs": "^16.0.0",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/@rnw-scripts/take-screenshot/package.json b/packages/@rnw-scripts/take-screenshot/package.json
index 843a53314c1..5baa4144b37 100644
--- a/packages/@rnw-scripts/take-screenshot/package.json
+++ b/packages/@rnw-scripts/take-screenshot/package.json
@@ -34,7 +34,7 @@
     "@types/node": "^22.14.0",
     "@types/yargs": "^16.0.0",
     "eslint": "^8.19.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "beachball": {
diff --git a/packages/e2e-test-app-fabric/package.json b/packages/e2e-test-app-fabric/package.json
index 75d6e039755..eb4505700a1 100644
--- a/packages/e2e-test-app-fabric/package.json
+++ b/packages/e2e-test-app-fabric/package.json
@@ -38,10 +38,10 @@
     "@babel/preset-typescript": "^7.8.3",
     "@babel/runtime": "^7.20.0",
     "@react-native-community/cli": "20.0.0",
-    "@react-native-windows/perf-testing": "0.0.0-canary.1034",
-    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native-windows/automation": "0.0.0-canary.1037",
     "@react-native-windows/automation-commands": "0.0.0-canary.1037",
+    "@react-native-windows/perf-testing": "0.0.0-canary.1034",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-node-config": "2.3.3",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
@@ -56,7 +56,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "react-test-renderer": "19.1.0",
     "sanitize-filename": "^1.6.3",
     "typescript": "5.0.4"
@@ -76,4 +76,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/playground/package.json b/packages/playground/package.json
index 418e67482a9..0cc51b9d90e 100644
--- a/packages/playground/package.json
+++ b/packages/playground/package.json
@@ -27,15 +27,15 @@
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/just-task": "2.3.58",
     "@rnw-scripts/metro-dev-config": "0.0.0",
+    "@rnw-scripts/sample-custom-component": "0.0.1",
     "@rnw-scripts/ts-config": "2.0.6",
     "@rnx-kit/cli": "^1.1.0",
     "@types/node": "^22.14.0",
     "@types/react": "^19.2.0",
     "eslint": "^8.19.0",
     "just-scripts": "^1.3.3",
-    "prettier": "2.8.8",
-    "react-test-renderer": "19.1.0",
-    "@rnw-scripts/sample-custom-component": "0.0.1"
+    "prettier": "^3.6.2",
+    "react-test-renderer": "19.1.0"
   },
   "rnx-kit": {
     "bundle": {
@@ -52,4 +52,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/react-native-platform-override/package.json b/packages/react-native-platform-override/package.json
index 90895d64f7f..db53e4b6dfb 100644
--- a/packages/react-native-platform-override/package.json
+++ b/packages/react-native-platform-override/package.json
@@ -66,7 +66,7 @@
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
     "minimatch": "^9.0.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "peerDependencies": {
diff --git a/packages/react-native-windows-init/package.json b/packages/react-native-windows-init/package.json
index 5338a995858..0b6c7843b16 100644
--- a/packages/react-native-windows-init/package.json
+++ b/packages/react-native-windows-init/package.json
@@ -53,7 +53,7 @@
     "babel-jest": "^29.6.3",
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "files": [
diff --git a/packages/sample-app-fabric/package.json b/packages/sample-app-fabric/package.json
index 6d8659aff16..2fc2768f2ed 100644
--- a/packages/sample-app-fabric/package.json
+++ b/packages/sample-app-fabric/package.json
@@ -42,11 +42,11 @@
     "eslint": "^8.19.0",
     "jest": "^29.7.0",
     "just-scripts": "^1.3.3",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "react-test-renderer": "19.1.0",
     "typescript": "5.0.4"
   },
   "engines": {
     "node": ">=18"
   }
-}
\ No newline at end of file
+}
diff --git a/packages/sample-custom-component/package.json b/packages/sample-custom-component/package.json
index 37d7e6fcc8d..9ffdbfc8ea5 100644
--- a/packages/sample-custom-component/package.json
+++ b/packages/sample-custom-component/package.json
@@ -48,10 +48,10 @@
     "eslint": "^8.19.0",
     "glob": "^7.1.6",
     "just-scripts": "^1.3.3",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "typescript": "5.0.4"
   },
   "engines": {
     "node": ">=18"
   }
-}
\ No newline at end of file
+}
diff --git a/vnext/overrides.json b/vnext/overrides.json
index 9c96b0c35a9..686d52ef9a6 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -252,6 +252,18 @@
       "baseFile": "packages/react-native/ReactCommon/react/renderer/components/view/accessibilityPropsConversions.h",
       "baseHash": "72cc422293c0e70f454225476cdabd3458bbce5e"
     },
+    {
+      "type": "patch",
+      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp",
+      "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventDispatcher.cpp",
+      "baseHash": "8585eaca4fa573b0264937db0c6c0b3facc933c8"
+    },
+    {
+      "type": "patch",
+      "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp",
+      "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventQueueProcessor.cpp",
+      "baseHash": "01fecdc627c28c20913fa240e153dcc5c376a3e9"
+    },
     {
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/propsConversions.h",
diff --git a/vnext/package.json b/vnext/package.json
index fa12dc6fc74..a2bd6ca52a0 100644
--- a/vnext/package.json
+++ b/vnext/package.json
@@ -47,11 +47,12 @@
     "event-target-shim": "^5.0.1",
     "flow-enums-runtime": "^0.0.6",
     "glob": "^7.1.1",
+    "hermes-compiler": "0.14.0-commitly-202512102158-39fca9fda",
     "invariant": "^2.2.4",
     "jest-environment-node": "^29.7.0",
     "memoize-one": "^5.0.0",
-    "metro-runtime": "^0.83.1",
-    "metro-source-map": "^0.83.1",
+    "metro-runtime": "^0.83.3",
+    "metro-source-map": "^0.83.3",
     "mkdirp": "^0.5.1",
     "nullthrows": "^1.1.1",
     "pretty-format": "^29.7.0",
@@ -59,17 +60,18 @@
     "react-devtools-core": "^6.1.5",
     "react-refresh": "^0.14.0",
     "regenerator-runtime": "^0.13.2",
-    "scheduler": "0.26.0",
+    "scheduler": "0.27.0",
     "semver": "^7.1.3",
     "source-map-support": "^0.5.19",
     "stacktrace-parser": "^0.1.10",
+    "tinyglobby": "^0.2.15",
     "whatwg-fetch": "^3.0.0",
-    "ws": "^6.2.3",
+    "ws": "^7.5.10",
     "yargs": "^17.6.2"
   },
   "devDependencies": {
-    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@react-native-windows/codegen": "0.0.0-canary.131",
+    "@react-native/metro-config": "0.84.0-nightly-20251212-dd390dbbe",
     "@rnw-scripts/babel-react-native-config": "0.0.0",
     "@rnw-scripts/eslint-config": "1.2.38",
     "@rnw-scripts/jest-out-of-tree-snapshot-resolver": "^1.1.42",
@@ -82,7 +84,7 @@
     "flow-bin": "^0.293.0",
     "jscodeshift": "^0.14.0",
     "just-scripts": "^1.3.3",
-    "prettier": "2.8.8",
+    "prettier": "^3.6.2",
     "react": "19.2.0",
     "react-native": "0.84.0-nightly-20251212-dd390dbbe",
     "react-native-platform-override": "0.0.0-canary.1020",
@@ -150,4 +152,4 @@
   "engines": {
     "node": ">= 22"
   }
-}
\ No newline at end of file
+}
diff --git a/yarn.lock b/yarn.lock
index 15b34a00f06..539b69eefa9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9400,7 +9400,7 @@ metro-runtime@0.83.3:
     "@babel/runtime" "^7.25.0"
     flow-enums-runtime "^0.0.6"
 
-metro-runtime@^0.83.1, metro-runtime@^0.83.3:
+metro-runtime@^0.83.3:
   version "0.83.5"
   resolved "https://registry.yarnpkg.com/metro-runtime/-/metro-runtime-0.83.5.tgz#52c1edafc6cc82e57729cc9c21700ab1e53a1777"
   integrity sha512-f+b3ue9AWTVlZe2Xrki6TAoFtKIqw30jwfk7GQ1rDUBQaE0ZQ+NkiMEtb9uwH7uAjJ87U7Tdx1Jg1OJqUfEVlA==
@@ -9424,7 +9424,7 @@ metro-source-map@0.83.3:
     source-map "^0.5.6"
     vlq "^1.0.0"
 
-metro-source-map@0.83.5, metro-source-map@^0.83.1, metro-source-map@^0.83.3:
+metro-source-map@0.83.5, metro-source-map@^0.83.3:
   version "0.83.5"
   resolved "https://registry.yarnpkg.com/metro-source-map/-/metro-source-map-0.83.5.tgz#384f311f83fa2bf51cbec08d77210aa951bf9ee3"
   integrity sha512-VT9bb2KO2/4tWY9Z2yeZqTUao7CicKAOps9LUg2aQzsz+04QyuXL3qgf1cLUVRjA/D6G5u1RJAlN1w9VNHtODQ==
@@ -10849,17 +10849,12 @@ prettier-plugin-hermes-parser@0.32.0:
   resolved "https://registry.yarnpkg.com/prettier-plugin-hermes-parser/-/prettier-plugin-hermes-parser-0.32.0.tgz#647cf22d77c76f9537e82d9de72c1a18c0749a9f"
   integrity sha512-Tx3rnrnu8z71g2AVXQYYlbHDuoXZ6vD4X/qTySGiqxebNNtFWqO04PcLEH7eTEXx8GhrfEE51oS19ZiglcdcLw==
 
-prettier@2.8.8:
-  version "2.8.8"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.8.tgz#e8c5d7e98a4305ffe3de2e1fc4aca1a71c28b1da"
-  integrity sha512-tdN8qQGvNjw4CHbY+XXk0JgCXn9QiF21a55rBe5LJAU+kDyC4WQn4+awm2Xfk2lQMk5fKup9XgzTZtGkjBdP9Q==
-
 prettier@3.6.2:
   version "3.6.2"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.6.2.tgz#ccda02a1003ebbb2bfda6f83a074978f608b9393"
   integrity sha512-I7AIg5boAr5R0FFtJ6rCfD+LFsWHp81dolrFD8S79U9tb8Az2nGrJncnMSnys+bpQJfRUzqs9hnA81OAA3hCuQ==
 
-prettier@^3.4.2:
+prettier@^3.4.2, prettier@^3.6.2:
   version "3.8.1"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-3.8.1.tgz#edf48977cf991558f4fcbd8a3ba6015ba2a3a173"
   integrity sha512-UOnG6LftzbdaHZcKoPFtOcCKztrQ57WkHDeRD9t/PTQtmT0NHSeWWepj6pS0z/N7+08BHFDQVUrfmfMRcZwbMg==
@@ -11596,16 +11591,16 @@ sax@>=0.6.0:
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.4.3.tgz#fcebae3b756cdc8428321805f4b70f16ec0ab5db"
   integrity sha512-yqYn1JhPczigF94DMS+shiDMjDowYO6y9+wB/4WgO0Y19jWYk0lQ4tuG5KI7kj4FTp1wxPj5IFfcrz/s1c3jjQ==
 
-scheduler@0.26.0, scheduler@^0.26.0:
-  version "0.26.0"
-  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.26.0.tgz#4ce8a8c2a2095f13ea11bf9a445be50c555d6337"
-  integrity sha512-NlHwttCI/l5gCPR3D1nNXtWABUmBwvZpEQiD4IXSbIDq8BzLIK/7Ir5gTFSGZDUu37K5cMNp0hFtzO38sC7gWA==
-
 scheduler@0.27.0:
   version "0.27.0"
   resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.27.0.tgz#0c4ef82d67d1e5c1e359e8fc76d3a87f045fe5bd"
   integrity sha512-eNv+WrVbKu1f3vbYJT/xtiF5syA5HPIMtf9IgY/nKg0sWqzAUEvqY/xm7OcZc/qafLx/iO9FgOmeSAp4v5ti/Q==
 
+scheduler@^0.26.0:
+  version "0.26.0"
+  resolved "https://registry.yarnpkg.com/scheduler/-/scheduler-0.26.0.tgz#4ce8a8c2a2095f13ea11bf9a445be50c555d6337"
+  integrity sha512-NlHwttCI/l5gCPR3D1nNXtWABUmBwvZpEQiD4IXSbIDq8BzLIK/7Ir5gTFSGZDUu37K5cMNp0hFtzO38sC7gWA==
+
 screenshot-desktop@^1.12.2:
   version "1.15.3"
   resolved "https://registry.yarnpkg.com/screenshot-desktop/-/screenshot-desktop-1.15.3.tgz#59c1abd904e21a5870d8930263db591923cc2eae"

From bb871a13be4fe5d2c1209ec48d0699a3b451b8e4 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Thu, 19 Mar 2026 15:22:56 +0530
Subject: [PATCH 12/14] Add chnages for the new files

---
 .../cxxreact/JSIndexedRAMBundle.cpp           |  8 ++--
 .../cxxreact/ReactMarker.cpp                  |  1 -
 .../jsiexecutor/jsireact/JSIExecutor.cpp      | 45 +------------------
 .../react/renderer/core/EventDispatcher.cpp   |  1 -
 .../renderer/core/EventQueueProcessor.cpp     |  4 +-
 .../react/renderer/uimanager/UIManager.cpp    |  6 +++
 .../react/runtime/ReactInstance.cpp           | 27 ++++++-----
 vnext/overrides.json                          | 26 +++++------
 8 files changed, 43 insertions(+), 75 deletions(-)

diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
index 9e4ced3fbd3..72e854fdb21 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
@@ -65,8 +65,8 @@ void JSIndexedRAMBundle::init() {
       "header size must exactly match the input file format");
 
   readBundle(reinterpret_cast<char*>(header), sizeof(header));
-  const size_t numTableEntries = folly::Endian::little(header[1]);
-  const size_t startupCodeSize = folly::Endian::little(header[2]);
+  size_t numTableEntries = folly::Endian::little(header[1]);
+  std::streamsize startupCodeSize = folly::Endian::little(header[2]);
 
   // allocate memory for meta data and lookup table.
   m_table = ModuleTable(numTableEntries);
@@ -78,7 +78,7 @@ void JSIndexedRAMBundle::init() {
   // read the startup code
   m_startupCode = std::make_unique<JSBigBufferString>(startupCodeSize - 1);
 
-  readBundle(m_startupCode->data(), startupCodeSize - 1);
+  readBundle(m_startupCode->mutableData(), startupCodeSize - 1);
 }
 
 JSIndexedRAMBundle::Module JSIndexedRAMBundle::getModule(
@@ -114,7 +114,7 @@ std::string JSIndexedRAMBundle::getModuleCode(const uint32_t id) const {
   return ret;
 }
 
-void JSIndexedRAMBundle::readBundle(char* buffer, const std::streamsize bytes)
+void JSIndexedRAMBundle::readBundle(char* buffer, std::streamsize bytes)
     const {
   if (!m_bundle->read(buffer, bytes)) {
     if ((m_bundle->rdstate() & std::ios::eofbit) != 0) {
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/ReactMarker.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/ReactMarker.cpp
index d5bbc09da2a..2a2155932db 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/ReactMarker.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/ReactMarker.cpp
@@ -11,7 +11,6 @@
 #pragma warning(disable : 4996) // deprecated APIs
 #endif
 #include "ReactMarker.h"
-#include <cxxreact/JSExecutor.h>
 
 namespace facebook::react::ReactMarker {
 
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsiexecutor/jsireact/JSIExecutor.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsiexecutor/jsireact/JSIExecutor.cpp
index 9b1fed162e9..408b876becd 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsiexecutor/jsireact/JSIExecutor.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/jsiexecutor/jsireact/JSIExecutor.cpp
@@ -173,8 +173,7 @@ void JSIExecutor::loadBundle(
     ReactMarker::logTaggedMarker(
         ReactMarker::RUN_JS_BUNDLE_START, scriptName.c_str());
   }
-  runtime_->evaluateJavaScript(
-      std::make_unique<BigStringBuffer>(std::move(script)), sourceURL);
+  runtime_->evaluateJavaScript(std::move(script), sourceURL);
   flush();
   if (hasLogger) {
     ReactMarker::logTaggedMarker(
@@ -217,7 +216,7 @@ void JSIExecutor::registerBundle(
           "Empty bundle registered with ID " + tag + " from " + bundlePath);
     }
     runtime_->evaluateJavaScript(
-        std::make_unique<BigStringBuffer>(std::move(script)),
+        std::move(script),
         JSExecutor::getSyntheticBundlePath(bundleId, bundlePath));
   }
   ReactMarker::logTaggedMarker(
@@ -582,46 +581,6 @@ void JSIExecutor::flush() {}
 
 #endif // RCT_REMOVE_LEGACY_ARCH
 
-void bindNativeLogger(Runtime& runtime, Logger logger) {
-  runtime.global().setProperty(
-      runtime,
-      "nativeLoggingHook",
-      Function::createFromHostFunction(
-          runtime,
-          PropNameID::forAscii(runtime, "nativeLoggingHook"),
-          2,
-          [logger = std::move(logger)](
-              jsi::Runtime& runtime,
-              const jsi::Value&,
-              const jsi::Value* args,
-              size_t count) {
-            if (count != 2) {
-              throw std::invalid_argument(
-                  "nativeLoggingHook takes 2 arguments");
-            }
-            logger(
-                args[0].asString(runtime).utf8(runtime),
-                static_cast<unsigned int>(args[1].asNumber()));
-            return Value::undefined();
-          }));
-}
-
-void bindNativePerformanceNow(Runtime& runtime) {
-  runtime.global().setProperty(
-      runtime,
-      "nativePerformanceNow",
-      Function::createFromHostFunction(
-          runtime,
-          PropNameID::forAscii(runtime, "nativePerformanceNow"),
-          0,
-          [](jsi::Runtime& runtime,
-             const jsi::Value&,
-             const jsi::Value* args,
-             size_t /*count*/) {
-            return HighResTimeStamp::now().toDOMHighResTimeStamp();
-          }));
-}
-
 } // namespace facebook::react
 
 #if _MSC_VER
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp
index ce609fc73e0..cdda14703a5 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp
@@ -11,7 +11,6 @@
 #pragma warning(disable : 4996) // deprecated APIs
 #endif
 #include "EventDispatcher.h"
-#include <cxxreact/JSExecutor.h>
 #include <react/renderer/core/StateUpdate.h>
 
 #include "EventQueue.h"
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp
index 9339a275b41..3ec2ec54fe5 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp
@@ -10,13 +10,11 @@
 #pragma warning(push)
 #pragma warning(disable : 4996) // deprecated APIs
 #endif
-#include <cxxreact/JSExecutor.h>
+#include "EventQueueProcessor.h"
 #include <logger/react_native_log.h>
 #include <react/featureflags/ReactNativeFeatureFlags.h>
 #include "EventEmitter.h"
 #include "EventLogger.h"
-#include "EventQueue.h"
-#include "ShadowNodeFamily.h"
 
 namespace facebook::react {
 
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/uimanager/UIManager.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/uimanager/UIManager.cpp
index ef70a0c9ce3..45c0ae7f881 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/uimanager/UIManager.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/uimanager/UIManager.cpp
@@ -210,6 +210,12 @@ void UIManager::completeSurface(
       // after we commit a specific one.
       lazyShadowTreeRevisionConsistencyManager_->updateCurrentRevision(
           surfaceId, shadowTree.getCurrentRevision().rootShadowNode);
+        
+      if (ReactNativeFeatureFlags::useSharedAnimatedBackend()) {
+        if (auto animationBackend = animationBackend_.lock()) {
+          animationBackend->clearRegistry(surfaceId);
+        }
+      }
     }
   });
 }
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/runtime/ReactInstance.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/runtime/ReactInstance.cpp
index 5b04335646d..ffecc083713 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/runtime/ReactInstance.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/react/runtime/ReactInstance.cpp
@@ -20,13 +20,13 @@
 #include <cxxreact/TraceSection.h>
 #include <glog/logging.h>
 #include <jsi/JSIDynamic.h>
-#include <jsi/hermes.h>
+#include <jsi/hermes-interfaces.h>
 #include <jsi/instrumentation.h>
 #include <jsinspector-modern/HostTarget.h>
-#include <jsireact/JSIExecutor.h>
 #include <react/featureflags/ReactNativeFeatureFlags.h>
 #include <react/renderer/core/ShadowNode.h>
 #include <react/renderer/runtimescheduler/RuntimeSchedulerBinding.h>
+#include <react/runtime/JSRuntimeBindings.h>
 #include <react/timing/primitives.h>
 #include <react/utils/jsi-utils.h>
 #include <iostream>
@@ -53,6 +53,12 @@ std::shared_ptr<RuntimeScheduler> createRuntimeScheduler(
   return scheduler;
 }
 
+std::string getSyntheticBundlePath(uint32_t bundleId) {
+  std::array<char, 32> buffer{};
+  std::snprintf(buffer.data(), buffer.size(), "seg-%u.js", bundleId);
+  return buffer.data();
+}
+
 } // namespace
 
 ReactInstance::ReactInstance(
@@ -94,7 +100,7 @@ ReactInstance::ReactInstance(
               jsErrorHandler->handleError(jsiRuntime, originalError, true);
             } catch (std::exception& ex) {
               jsi::JSError error(
-                  jsiRuntime, std::string("Non-js exception: ") + ex.what());
+                  jsiRuntime, std::string("Non-JS exception: ") + ex.what());
               jsErrorHandler->handleError(jsiRuntime, error, true);
             }
           });
@@ -161,6 +167,11 @@ ReactInstance::ReactInstance(
         runtimeScheduler->scheduleWork(std::move(callback));
       });
 }
+ReactInstance::~ReactInstance() noexcept {
+  if (timerManager_ != nullptr) {
+    timerManager_->quit();
+  }
+}
 
 void ReactInstance::unregisterFromInspector() {
   if (inspectorTarget_ != nullptr) {
@@ -226,7 +237,7 @@ void ReactInstance::loadScript(
     const std::string& sourceURL,
     std::function<void(jsi::Runtime& runtime)>&& beforeLoad,
     std::function<void(jsi::Runtime& runtime)>&& afterLoad) {
-  auto buffer = std::make_shared<BigStringBuffer>(std::move(script));
+  std::shared_ptr<const jsi::Buffer> buffer(std::move(script));
   std::string scriptName = simpleBasename(sourceURL);
 
   runtimeScheduler_->scheduleWork([this,
@@ -237,7 +248,7 @@ void ReactInstance::loadScript(
                                        std::weak_ptr<BufferedRuntimeExecutor>(
                                            bufferedRuntimeExecutor_),
                                    beforeLoad,
-                                   afterLoad](jsi::Runtime& runtime) {
+                                   afterLoad](jsi::Runtime& runtime) mutable {
     if (beforeLoad) {
       beforeLoad(runtime);
     }
@@ -362,7 +373,6 @@ void ReactInstance::registerSegment(
       throw std::invalid_argument(
           "Empty segment registered with ID " + tag + " from " + segmentPath);
     }
-    auto buffer = std::make_shared<BigStringBuffer>(std::move(script));
 
     bool hasLogger(ReactMarker::logTaggedMarkerBridgelessImpl != nullptr);
     if (hasLogger) {
@@ -371,11 +381,8 @@ void ReactInstance::registerSegment(
     }
     LOG(WARNING) << "Starting to evaluate segment " << segmentId
                  << " in ReactInstance::registerSegment";
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Wdeprecated-declarations"
     runtime.evaluateJavaScript(
-        buffer, JSExecutor::getSyntheticBundlePath(segmentId, segmentPath));
-#pragma clang diagnostic pop
+        std::move(script), getSyntheticBundlePath(segmentId));
     LOG(WARNING) << "Finished evaluating segment " << segmentId
                  << " in ReactInstance::registerSegment";
     if (hasLogger) {
diff --git a/vnext/overrides.json b/vnext/overrides.json
index 686d52ef9a6..09d893f07da 100644
--- a/vnext/overrides.json
+++ b/vnext/overrides.json
@@ -74,10 +74,10 @@
       "baseHash": "055780673941b2ef9997b50c5b88f46d07ec4d28"
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp",
       "baseFile": "packages/react-native/ReactCommon/cxxreact/JSIndexedRAMBundle.cpp",
-      "baseHash": "001977331502eb71ad71a4b5721542ef434ac2cd"
+      "baseHash": "137b3479e4086c2982b56e5c394951000954dd0a"
     },
     {
       "type": "patch",
@@ -108,7 +108,7 @@
       "type": "patch",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/ReactMarker.cpp",
       "baseFile": "packages/react-native/ReactCommon/cxxreact/ReactMarker.cpp",
-      "baseHash": "0561086bf2bb4cb260dff05f82bbaac2b647a149"
+      "baseHash": "3320750a1ebb55268cb4504e62b009ae62b5ea9a"
     },
     {
       "type": "patch",
@@ -125,10 +125,10 @@
       "issue": 12210
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/jsiexecutor/jsireact/JSIExecutor.cpp",
       "baseFile": "packages/react-native/ReactCommon/jsiexecutor/jsireact/JSIExecutor.cpp",
-      "baseHash": "37ca5cc8c0d30c20ab67a80e0a523966234ac702"
+      "baseHash": "2579efb816d78bf9516bf7b0d39fea56622621a5"
     },
     {
       "type": "patch",
@@ -253,16 +253,16 @@
       "baseHash": "72cc422293c0e70f454225476cdabd3458bbce5e"
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventDispatcher.cpp",
       "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventDispatcher.cpp",
-      "baseHash": "8585eaca4fa573b0264937db0c6c0b3facc933c8"
+      "baseHash": "42988a48e4c1e7f1628a72676d0bc6cf2c25d8d3"
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/core/EventQueueProcessor.cpp",
       "baseFile": "packages/react-native/ReactCommon/react/renderer/core/EventQueueProcessor.cpp",
-      "baseHash": "01fecdc627c28c20913fa240e153dcc5c376a3e9"
+      "baseHash": "f5f29ba820682da68ba6fba7935e2d3a3e2881ed"
     },
     {
       "type": "patch",
@@ -272,16 +272,16 @@
       "issue": 15782
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/renderer/uimanager/UIManager.cpp",
       "baseFile": "packages/react-native/ReactCommon/react/renderer/uimanager/UIManager.cpp",
-      "baseHash": "f562089febf0382dd27d8caed23429375af79cbb"
+      "baseHash": "a3631f83c2779dbcd7494c8bebc95652cc121b81"
     },
     {
-      "type": "patch",
+      "type": "derived",
       "file": "ReactCommon/TEMP_UntilReactCommonUpdate/react/runtime/ReactInstance.cpp",
       "baseFile": "packages/react-native/ReactCommon/react/runtime/ReactInstance.cpp",
-      "baseHash": "2ca899d68ebd5314c991d7f394f8ea4f3c6baf39"
+      "baseHash": "8ba7b2445e78a8addd7b6ebec7a3649783b48b5f"
     },
     {
       "type": "copy",

From ceece30a8935886bd14511748ed2734a9d471b25 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Thu, 19 Mar 2026 15:39:24 +0530
Subject: [PATCH 13/14] Change files

---
 ...ws-automation-29636134-b148-4151-9b6a-02df04811bdc.json | 7 +++++++
 ...tion-commands-72b29ff7-cadd-448f-898e-a32af64968b9.json | 7 +++++++
 ...e-windows-cli-0795a537-8e99-4888-8d24-cd6a261a24cd.json | 7 +++++++
 ...ind-repo-root-32d9d9bf-9d3e-4d21-bb1e-c42aa555dcb2.json | 7 +++++++
 ...ve-windows-fs-0a613149-b0a6-4c8b-a267-4633c1e5bbfd.json | 7 +++++++
 ...package-utils-2c04a2c8-fb90-416c-bb82-6bba1aad8972.json | 7 +++++++
 ...-perf-testing-46ea050f-3372-46d9-bbf9-8f9251af5a8d.json | 7 +++++++
 ...ows-telemetry-99370491-6cc6-4873-aebb-53ca5698fffc.json | 7 +++++++
 ...form-override-9f668259-e328-4c66-9da8-50ae0cb57d5a.json | 7 +++++++
 ...-windows-init-86a95ce1-fbe2-4e9f-9a05-22ad66a9a8df.json | 7 +++++++
 10 files changed, 70 insertions(+)
 create mode 100644 change/@react-native-windows-automation-29636134-b148-4151-9b6a-02df04811bdc.json
 create mode 100644 change/@react-native-windows-automation-commands-72b29ff7-cadd-448f-898e-a32af64968b9.json
 create mode 100644 change/@react-native-windows-cli-0795a537-8e99-4888-8d24-cd6a261a24cd.json
 create mode 100644 change/@react-native-windows-find-repo-root-32d9d9bf-9d3e-4d21-bb1e-c42aa555dcb2.json
 create mode 100644 change/@react-native-windows-fs-0a613149-b0a6-4c8b-a267-4633c1e5bbfd.json
 create mode 100644 change/@react-native-windows-package-utils-2c04a2c8-fb90-416c-bb82-6bba1aad8972.json
 create mode 100644 change/@react-native-windows-perf-testing-46ea050f-3372-46d9-bbf9-8f9251af5a8d.json
 create mode 100644 change/@react-native-windows-telemetry-99370491-6cc6-4873-aebb-53ca5698fffc.json
 create mode 100644 change/react-native-platform-override-9f668259-e328-4c66-9da8-50ae0cb57d5a.json
 create mode 100644 change/react-native-windows-init-86a95ce1-fbe2-4e9f-9a05-22ad66a9a8df.json

diff --git a/change/@react-native-windows-automation-29636134-b148-4151-9b6a-02df04811bdc.json b/change/@react-native-windows-automation-29636134-b148-4151-9b6a-02df04811bdc.json
new file mode 100644
index 00000000000..2b4a5d09adc
--- /dev/null
+++ b/change/@react-native-windows-automation-29636134-b148-4151-9b6a-02df04811bdc.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/automation",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-automation-commands-72b29ff7-cadd-448f-898e-a32af64968b9.json b/change/@react-native-windows-automation-commands-72b29ff7-cadd-448f-898e-a32af64968b9.json
new file mode 100644
index 00000000000..8a9ecae7a00
--- /dev/null
+++ b/change/@react-native-windows-automation-commands-72b29ff7-cadd-448f-898e-a32af64968b9.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/automation-commands",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-cli-0795a537-8e99-4888-8d24-cd6a261a24cd.json b/change/@react-native-windows-cli-0795a537-8e99-4888-8d24-cd6a261a24cd.json
new file mode 100644
index 00000000000..7d3e2252b77
--- /dev/null
+++ b/change/@react-native-windows-cli-0795a537-8e99-4888-8d24-cd6a261a24cd.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/cli",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-find-repo-root-32d9d9bf-9d3e-4d21-bb1e-c42aa555dcb2.json b/change/@react-native-windows-find-repo-root-32d9d9bf-9d3e-4d21-bb1e-c42aa555dcb2.json
new file mode 100644
index 00000000000..ddadb896a63
--- /dev/null
+++ b/change/@react-native-windows-find-repo-root-32d9d9bf-9d3e-4d21-bb1e-c42aa555dcb2.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/find-repo-root",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-fs-0a613149-b0a6-4c8b-a267-4633c1e5bbfd.json b/change/@react-native-windows-fs-0a613149-b0a6-4c8b-a267-4633c1e5bbfd.json
new file mode 100644
index 00000000000..44bf71758ec
--- /dev/null
+++ b/change/@react-native-windows-fs-0a613149-b0a6-4c8b-a267-4633c1e5bbfd.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/fs",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-package-utils-2c04a2c8-fb90-416c-bb82-6bba1aad8972.json b/change/@react-native-windows-package-utils-2c04a2c8-fb90-416c-bb82-6bba1aad8972.json
new file mode 100644
index 00000000000..00fcd35d9e2
--- /dev/null
+++ b/change/@react-native-windows-package-utils-2c04a2c8-fb90-416c-bb82-6bba1aad8972.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/package-utils",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-perf-testing-46ea050f-3372-46d9-bbf9-8f9251af5a8d.json b/change/@react-native-windows-perf-testing-46ea050f-3372-46d9-bbf9-8f9251af5a8d.json
new file mode 100644
index 00000000000..f0dde189a5e
--- /dev/null
+++ b/change/@react-native-windows-perf-testing-46ea050f-3372-46d9-bbf9-8f9251af5a8d.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/perf-testing",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/@react-native-windows-telemetry-99370491-6cc6-4873-aebb-53ca5698fffc.json b/change/@react-native-windows-telemetry-99370491-6cc6-4873-aebb-53ca5698fffc.json
new file mode 100644
index 00000000000..9538889feb3
--- /dev/null
+++ b/change/@react-native-windows-telemetry-99370491-6cc6-4873-aebb-53ca5698fffc.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "@react-native-windows/telemetry",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/react-native-platform-override-9f668259-e328-4c66-9da8-50ae0cb57d5a.json b/change/react-native-platform-override-9f668259-e328-4c66-9da8-50ae0cb57d5a.json
new file mode 100644
index 00000000000..00164e6c860
--- /dev/null
+++ b/change/react-native-platform-override-9f668259-e328-4c66-9da8-50ae0cb57d5a.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "react-native-platform-override",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}
diff --git a/change/react-native-windows-init-86a95ce1-fbe2-4e9f-9a05-22ad66a9a8df.json b/change/react-native-windows-init-86a95ce1-fbe2-4e9f-9a05-22ad66a9a8df.json
new file mode 100644
index 00000000000..59eb65dc0f1
--- /dev/null
+++ b/change/react-native-windows-init-86a95ce1-fbe2-4e9f-9a05-22ad66a9a8df.json
@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Integrate 0.84.0-nightly-20251212-dd390dbbe",
+  "packageName": "react-native-windows-init",
+  "email": "66076509+vineethkuttan@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}

From c0077e357a14815a75c7629c7e645f0092305b26 Mon Sep 17 00:00:00 2001
From: vineethkuttan <66076509+vineethkuttan@users.noreply.github.com>
Date: Fri, 20 Mar 2026 12:14:33 +0530
Subject: [PATCH 14/14] Build fix and Adding tester files

---
 .../IntersectionObserverBenchmark.js          | 129 ++++++
 .../IntersectionObserverClippingParent.js     | 404 ++++++++++++++++++
 .../IntersectionObserverClippingRoot.js       | 400 +++++++++++++++++
 .../IntersectionObserverExplicitRoot.js       | 278 ++++++++++++
 .../IntersectionObserverExplicitRootScroll.js | 245 +++++++++++
 .../IntersectionObserverIndex.js              |  37 ++
 .../IntersectionObserverMDNExample.js         | 181 ++++++++
 .../IntersectionObserverRootThreshold.js      | 224 ++++++++++
 .../cxxreact/JSIndexedRAMBundle.cpp           |   2 +-
 9 files changed, 1899 insertions(+), 1 deletion(-)
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverBenchmark.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingParent.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingRoot.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRoot.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRootScroll.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverIndex.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverMDNExample.js
 create mode 100644 packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverRootThreshold.js

diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverBenchmark.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverBenchmark.js
new file mode 100644
index 00000000000..660d0f096f3
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverBenchmark.js
@@ -0,0 +1,129 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+
+import {RNTesterThemeContext} from '../../components/RNTesterTheme';
+import * as React from 'react';
+import {
+  type ElementRef,
+  useContext,
+  useLayoutEffect,
+  useRef,
+  useState,
+} from 'react';
+import {Button, ScrollView, StyleSheet, Text, View} from 'react-native';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export const name = 'IntersectionObserver Benchmark';
+export const title = name;
+export const description =
+  'Example of using IntersectionObserver to observe a large amount of UI elements';
+
+export function render(): React.Node {
+  return <IntersectionObserverBenchark />;
+}
+
+const ROWS = 100;
+const COLUMNS = 5;
+
+function IntersectionObserverBenchark(): React.Node {
+  const [isObserving, setObserving] = useState(false);
+
+  return (
+    <>
+      <View style={styles.buttonContainer}>
+        <Button
+          title={isObserving ? 'Stop observing' : 'Start observing'}
+          onPress={() => setObserving(observing => !observing)}
+        />
+      </View>
+      <ScrollView>
+        {Array(ROWS)
+          .fill(null)
+          .map((_, row) => (
+            <View style={styles.row} key={row}>
+              {Array(COLUMNS)
+                .fill(null)
+                .map((_2, column) => (
+                  <Item
+                    index={COLUMNS * row + column}
+                    observe={isObserving}
+                    key={column}
+                  />
+                ))}
+            </View>
+          ))}
+      </ScrollView>
+    </>
+  );
+}
+
+function Item({index, observe}: {index: number, observe: boolean}): React.Node {
+  const theme = useContext(RNTesterThemeContext);
+  const ref = useRef<?ElementRef<typeof View>>();
+
+  useLayoutEffect(() => {
+    const element = ref.current;
+
+    if (!observe || !element) {
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      entries => {
+        // You can inspect the actual entries here.
+        // We don't log them by default to avoid the logs themselves to degrade
+        // performance.
+      },
+      {
+        threshold: [0, 1],
+      },
+    );
+
+    observer.observe(element);
+
+    return () => {
+      observer.disconnect();
+    };
+  }, [observe]);
+
+  return (
+    <View
+      ref={ref}
+      style={[
+        styles.item,
+        {backgroundColor: theme.SecondarySystemBackgroundColor},
+      ]}>
+      <Text style={[styles.itemText, {color: theme.LabelColor}]}>
+        {index + 1}
+      </Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  buttonContainer: {
+    padding: 10,
+  },
+  row: {
+    flexDirection: 'row',
+  },
+  item: {
+    flex: 1,
+    padding: 12,
+    margin: 5,
+  },
+  itemText: {
+    fontSize: 22,
+    textAlign: 'center',
+  },
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingParent.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingParent.js
new file mode 100644
index 00000000000..085024cb114
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingParent.js
@@ -0,0 +1,404 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow strict-local
+ */
+
+import type {HostInstance} from 'react-native';
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+import type IntersectionObserverEntry from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserverEntry';
+
+import * as React from 'react';
+import {useCallback, useLayoutEffect, useRef, useState} from 'react';
+import {Button, StyleSheet, Text, TextInput, View} from 'react-native';
+
+export const name = 'IntersectionObserver Parent Clipping Example';
+export const title = name;
+export const description = 'A clipping parent clips both the root and target';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export function render(): React.Node {
+  return <IntersectionObserverCustomClippingRootExample />;
+}
+
+/**
+ * Showcase threshold of two overlapping elements
+ */
+function roundRect(rect: mixed): ?{
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+} {
+  if (rect == null || typeof rect !== 'object') {
+    return null;
+  }
+  // $FlowFixMe[prop-missing]
+  const x = rect.x;
+  // $FlowFixMe[prop-missing]
+  const y = rect.y;
+  // $FlowFixMe[prop-missing]
+  const width = rect.width;
+  // $FlowFixMe[prop-missing]
+  const height = rect.height;
+
+  if (
+    typeof x !== 'number' ||
+    typeof y !== 'number' ||
+    typeof width !== 'number' ||
+    typeof height !== 'number'
+  ) {
+    return null;
+  }
+  return {
+    x: Math.round(x),
+    y: Math.round(y),
+    width: Math.round(width),
+    height: Math.round(height),
+  };
+}
+
+function IntersectionObserverCustomClippingRootExample(): React.Node {
+  const rootRef = useRef<?HostInstance>(null);
+  const targetRef = useRef<?HostInstance>(null);
+  const [intersectionEntry, setIntersectionEntry] =
+    useState<?IntersectionObserverEntry>(null);
+  const [rootMarginInput, setRootMarginInput] = useState<string>('0');
+  const [rootMarginValue, setRootMarginValue] = useState<string>('0px');
+
+  const onObserve = useCallback(
+    (entries: $ReadOnlyArray<IntersectionObserverEntry>) => {
+      entries.forEach(entry => {
+        setIntersectionEntry(entry);
+      });
+    },
+    [],
+  );
+
+  const handleSubmit = useCallback(() => {
+    const marginValue = `${rootMarginInput}px`;
+    setRootMarginValue(marginValue);
+  }, [rootMarginInput]);
+
+  const observer = useRef<?IntersectionObserver>(null);
+  useLayoutEffect(() => {
+    const rootNode = rootRef.current;
+    const targetNode = targetRef.current;
+
+    if (rootNode == null || targetNode == null) {
+      return;
+    }
+
+    observer.current = new IntersectionObserver(onObserve, {
+      // $FlowFixMe[incompatible-type]
+      root: rootNode,
+      rootMargin: rootMarginValue,
+    });
+    // $FlowFixMe[incompatible-type]
+    observer.current.observe(targetNode);
+    return () => {
+      if (rootNode == null || targetNode == null) {
+        observer.current?.disconnect();
+      }
+
+      // $FlowFixMe[incompatible-type]
+      observer.current?.unobserve(targetNode);
+    };
+  }, [onObserve, rootMarginValue]);
+
+  const ROOT_SIZE = 300;
+  const rootMarginNumeric = parseFloat(rootMarginInput) || 0;
+
+  // Calculate rootMargin bounds
+  // For positive margins: expands beyond root
+  // For negative margins: contracts inside root
+  const rootMarginSize = ROOT_SIZE + 2 * rootMarginNumeric;
+  const rootMarginOffset = -rootMarginNumeric;
+
+  return (
+    <>
+      <View style={styles.inputContainer}>
+        <Text style={styles.label}>Root Margin (px):</Text>
+        <TextInput
+          style={styles.input}
+          value={rootMarginInput}
+          onChangeText={setRootMarginInput}
+          keyboardType="numeric"
+          placeholder="0"
+        />
+        <Button title="Submit" onPress={handleSubmit} />
+      </View>
+      <Text style={styles.currentMargin}>
+        Current Root Margin: {rootMarginValue}
+      </Text>
+      <Text style={styles.description}>
+        This example highlights a clipping parent to both the explicit root
+        (blue) and target (yellow). The dashed borders show the full extent of
+        the root and target, while the solid colors show what's actually visible
+        after clipping. The purple dashed border shows the root bounds after
+        applying rootMargin.
+      </Text>
+      <View style={styles.legend}>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendClipping]} />
+          <Text style={styles.legendText}>Clipping Area (100x100)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendRoot]} />
+          <Text style={styles.legendText}>Root (visible)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendTarget]} />
+          <Text style={styles.legendText}>Target (visible)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendIndicator]} />
+          <Text style={styles.legendText}>Full extent (dashed)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendRootMargin]} />
+          <Text style={styles.legendText}>Root + Margin (purple)</Text>
+        </View>
+      </View>
+      <View style={styles.visualizationContainer}>
+        <View style={styles.clippingParent}>
+          <View ref={rootRef} style={styles.root}>
+            <View ref={targetRef} style={styles.target} />
+          </View>
+        </View>
+        {/* Visual indicators showing full extent of root and target */}
+        <View style={styles.indicatorContainer} pointerEvents="none">
+          <View style={styles.rootIndicator}>
+            <Text style={[styles.indicatorLabel, styles.rootLabel]}>
+              Root (300x300)
+            </Text>
+          </View>
+          <View style={styles.targetIndicator}>
+            <Text style={[styles.indicatorLabel, styles.targetLabel]}>
+              Target (100x100)
+            </Text>
+          </View>
+          {/* Root margin indicator */}
+          <View
+            style={[
+              styles.rootMarginIndicator,
+              {
+                top: rootMarginOffset,
+                left: rootMarginOffset,
+                width: rootMarginSize,
+                height: rootMarginSize,
+              },
+            ]}>
+            <Text style={[styles.indicatorLabel, styles.rootMarginLabel]}>
+              Root + Margin ({rootMarginSize}x{rootMarginSize})
+            </Text>
+          </View>
+        </View>
+      </View>
+
+      {intersectionEntry != null && (
+        <View style={styles.metricsContainer}>
+          <Text style={styles.metricsTitle}>
+            Intersection Observer Metrics:
+          </Text>
+          <Text style={styles.metric}>
+            Intersecting: {intersectionEntry.isIntersecting.toString()}
+          </Text>
+          <Text style={styles.metric}>
+            Intersection Ratio:{' '}
+            {(intersectionEntry.intersectionRatio * 100).toFixed(1)}%
+          </Text>
+          <Text style={styles.metric}>
+            Intersection Rect:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.intersectionRect))}
+          </Text>
+          <Text style={styles.metric}>
+            Bounding Client Rect:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.boundingClientRect))}
+          </Text>
+          <Text style={styles.metric}>
+            Root Bounds:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.rootBounds))}
+          </Text>
+        </View>
+      )}
+    </>
+  );
+}
+
+const styles = StyleSheet.create({
+  inputContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: 10,
+    gap: 10,
+    paddingHorizontal: 10,
+  },
+  label: {
+    fontSize: 14,
+    fontWeight: 'bold',
+  },
+  input: {
+    borderWidth: 1,
+    borderColor: '#ccc',
+    padding: 5,
+    width: 80,
+    fontSize: 14,
+  },
+  currentMargin: {
+    fontSize: 14,
+    marginBottom: 5,
+    paddingHorizontal: 10,
+    fontStyle: 'italic',
+  },
+  description: {
+    fontSize: 13,
+    marginBottom: 15,
+    paddingHorizontal: 10,
+    color: '#555',
+  },
+  visualizationContainer: {
+    position: 'relative',
+    alignSelf: 'center',
+    marginBottom: 20,
+  },
+  clippingParent: {
+    height: 100,
+    width: 100,
+    overflow: 'hidden',
+    backgroundColor: '#e0e0e0',
+    borderWidth: 2,
+    borderColor: '#999',
+  },
+  root: {
+    backgroundColor: 'rgba(0, 0, 255, 0.2)',
+    height: 300,
+    width: 300,
+  },
+  target: {
+    backgroundColor: 'rgba(255, 255, 0, 0.2)',
+    marginLeft: -50,
+    height: 100,
+    width: 100,
+  },
+  indicatorContainer: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    width: 300,
+    height: 300,
+  },
+  rootIndicator: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    width: 300,
+    height: 300,
+    borderWidth: 2,
+    borderColor: 'blue',
+    borderStyle: 'dashed',
+  },
+  targetIndicator: {
+    position: 'absolute',
+    top: 0,
+    left: -51,
+    width: 100,
+    height: 100,
+    borderWidth: 2,
+    borderColor: 'orange',
+    borderStyle: 'dashed',
+  },
+  rootMarginIndicator: {
+    position: 'absolute',
+    borderWidth: 3,
+    borderColor: 'rgba(128, 0, 128, 0.6)',
+    borderStyle: 'dashed',
+  },
+  indicatorLabel: {
+    fontSize: 10,
+    color: '#333',
+    fontWeight: 'bold',
+    backgroundColor: 'rgba(255, 255, 255, 0.8)',
+    padding: 2,
+    position: 'absolute',
+  },
+  rootLabel: {
+    top: 5,
+    left: 5,
+  },
+  targetLabel: {
+    top: 40,
+    left: 5,
+  },
+  rootMarginLabel: {
+    bottom: 5,
+    right: 5,
+  },
+  legend: {
+    backgroundColor: 'white',
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    paddingHorizontal: 10,
+    marginBottom: 15,
+    gap: 15,
+  },
+  legendItem: {
+    flexDirection: 'row',
+    justifyContent: 'flex-start',
+    alignItems: 'center',
+    gap: 5,
+  },
+  legendBox: {
+    width: 20,
+    height: 20,
+    borderWidth: 1,
+  },
+  legendClipping: {
+    backgroundColor: '#e0e0e0',
+    borderColor: '#999',
+  },
+  legendRoot: {
+    backgroundColor: 'rgba(0, 0, 255, 0.3)',
+    borderColor: 'blue',
+  },
+  legendTarget: {
+    backgroundColor: 'rgba(255, 255, 0, 0.5)',
+    borderColor: 'orange',
+  },
+  legendIndicator: {
+    backgroundColor: 'transparent',
+    borderStyle: 'dashed',
+    borderColor: '#333',
+  },
+  legendRootMargin: {
+    backgroundColor: 'transparent',
+    borderStyle: 'dashed',
+    borderColor: 'rgba(128, 0, 128, 0.6)',
+    borderWidth: 2,
+  },
+  legendText: {
+    fontSize: 12,
+  },
+  metricsContainer: {
+    paddingHorizontal: 10,
+    backgroundColor: '#f5f5f5',
+    padding: 10,
+    borderRadius: 5,
+    marginHorizontal: 10,
+  },
+  metricsTitle: {
+    fontSize: 14,
+    fontWeight: 'bold',
+    marginBottom: 5,
+  },
+  metric: {
+    fontSize: 12,
+    marginBottom: 3,
+    fontFamily: 'monospace',
+  },
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingRoot.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingRoot.js
new file mode 100644
index 00000000000..e08a2bf4f91
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverClippingRoot.js
@@ -0,0 +1,400 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow strict-local
+ */
+
+import type {HostInstance} from 'react-native';
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+import type IntersectionObserverEntry from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserverEntry';
+
+import * as React from 'react';
+import {useCallback, useLayoutEffect, useRef, useState} from 'react';
+import {Button, StyleSheet, Text, TextInput, View} from 'react-native';
+
+export const name = 'IntersectionObserver Root Clipping Example';
+export const title = name;
+export const description = 'A root that clips its target';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export function render(): React.Node {
+  return <IntersectionObserverClippingRootExample />;
+}
+
+function roundRect(rect: mixed): ?{
+  x: number,
+  y: number,
+  width: number,
+  height: number,
+} {
+  if (rect == null || typeof rect !== 'object') {
+    return null;
+  }
+  // $FlowFixMe[prop-missing]
+  const x = rect.x;
+  // $FlowFixMe[prop-missing]
+  const y = rect.y;
+  // $FlowFixMe[prop-missing]
+  const width = rect.width;
+  // $FlowFixMe[prop-missing]
+  const height = rect.height;
+
+  if (
+    typeof x !== 'number' ||
+    typeof y !== 'number' ||
+    typeof width !== 'number' ||
+    typeof height !== 'number'
+  ) {
+    return null;
+  }
+  return {
+    x: Math.round(x),
+    y: Math.round(y),
+    width: Math.round(width),
+    height: Math.round(height),
+  };
+}
+
+/**
+ * Showcase clipping when the root has overflow: hidden
+ */
+function IntersectionObserverClippingRootExample(): React.Node {
+  const rootRef = useRef<?HostInstance>(null);
+  const targetRef = useRef<?HostInstance>(null);
+  const [intersectionEntry, setIntersectionEntry] =
+    useState<?IntersectionObserverEntry>(null);
+  const [rootMarginInput, setRootMarginInput] = useState<string>('0');
+  const [rootMarginValue, setRootMarginValue] = useState<string>('0px');
+
+  const handleSubmit = useCallback(() => {
+    const marginValue = `${rootMarginInput}px`;
+    setRootMarginValue(marginValue);
+  }, [rootMarginInput]);
+
+  const onObserve = useCallback(
+    (entries: $ReadOnlyArray<IntersectionObserverEntry>) => {
+      entries.forEach(entry => {
+        setIntersectionEntry(entry);
+      });
+    },
+    [],
+  );
+
+  const observer = useRef<?IntersectionObserver>(null);
+  useLayoutEffect(() => {
+    const rootNode = rootRef.current;
+    const targetNode = targetRef.current;
+
+    if (rootNode == null || targetNode == null) {
+      return;
+    }
+
+    observer.current = new IntersectionObserver(onObserve, {
+      // $FlowFixMe[incompatible-type]
+      root: rootNode,
+      // $FlowExpectedError[prop-missing] rootMargin is not even defined in Flow.
+      rootMargin: rootMarginValue,
+    });
+    // $FlowFixMe[incompatible-type]
+    observer.current.observe(targetNode);
+    return () => {
+      if (rootNode == null || targetNode == null) {
+        observer.current?.disconnect();
+      }
+
+      // $FlowFixMe[incompatible-type]
+      observer.current?.unobserve(targetNode);
+    };
+  }, [onObserve, rootMarginValue]);
+
+  const CONCEPTUAL_ROOT_SIZE = 200;
+  const TARGET_SIZE = 100;
+  const rootMarginNumeric = parseFloat(rootMarginInput) || 0;
+
+  // Calculate rootMargin bounds based on conceptual root size
+  const rootMarginSize = CONCEPTUAL_ROOT_SIZE + 2 * rootMarginNumeric;
+  const rootMarginOffset = -rootMarginNumeric;
+
+  return (
+    <>
+      <View style={styles.inputContainer}>
+        <Text style={styles.label}>Root Margin (px):</Text>
+        <TextInput
+          style={styles.input}
+          value={rootMarginInput}
+          onChangeText={setRootMarginInput}
+          keyboardType="numeric"
+          placeholder="0"
+        />
+        <Button title="Submit" onPress={handleSubmit} />
+      </View>
+      <Text style={styles.currentMargin}>
+        Current Root Margin: {rootMarginValue}
+      </Text>
+      <Text style={styles.description}>
+        This example shows an explicit root (yellow) that clips its target
+        (red). The solid background colors show what is visible. The dashed
+        borders show the size of root and target before clipping. The purple
+        dashed border shows the rootMargin applied. We expect the
+        intersectionRect to be unaffected by rootMargin.
+      </Text>
+      <View style={styles.legend}>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendClipping]} />
+          <Text style={styles.legendText}>Clipped (100x100)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendRoot]} />
+          <Text style={styles.legendText}>Unclipped Root (200x200)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendTarget]} />
+          <Text style={styles.legendText}>Target (100x100)</Text>
+        </View>
+        <View style={styles.legendItem}>
+          <View style={[styles.legendBox, styles.legendRootMargin]} />
+          <Text style={styles.legendText}>Root + Margin (purple)</Text>
+        </View>
+      </View>
+      <View style={styles.visualizationContainer}>
+        {/* Show conceptual root size (before clipping) */}
+        <View style={styles.conceptualRoot}>
+          <View ref={rootRef} style={styles.clipping}>
+            <View ref={targetRef} style={styles.target} />
+          </View>
+        </View>
+        {/* Visual indicators showing full extent */}
+        <View style={styles.indicatorContainer} pointerEvents="none">
+          <View style={styles.rootIndicator}>
+            <Text style={[styles.indicatorLabel, styles.rootLabel]}>
+              Root ({CONCEPTUAL_ROOT_SIZE}x{CONCEPTUAL_ROOT_SIZE})
+            </Text>
+          </View>
+          <View style={styles.targetIndicator}>
+            <Text style={[styles.indicatorLabel, styles.targetLabel]}>
+              Target ({TARGET_SIZE}x{TARGET_SIZE})
+            </Text>
+          </View>
+          {/* Root margin indicator */}
+          <View
+            style={[
+              styles.rootMarginIndicator,
+              {
+                top: rootMarginOffset,
+                left: rootMarginOffset,
+                width: rootMarginSize,
+                height: rootMarginSize,
+              },
+            ]}>
+            <Text style={[styles.indicatorLabel, styles.rootMarginLabel]}>
+              Root + Margin ({rootMarginSize}x{rootMarginSize})
+            </Text>
+          </View>
+        </View>
+      </View>
+      {intersectionEntry != null && (
+        <View style={styles.metricsContainer}>
+          <Text style={styles.metricsTitle}>
+            Intersection Observer Metrics:
+          </Text>
+          <Text style={styles.metric}>
+            Intersecting: {intersectionEntry.isIntersecting.toString()}
+          </Text>
+          <Text style={styles.metric}>
+            Intersection Ratio:{' '}
+            {(intersectionEntry.intersectionRatio * 100).toFixed(1)}%
+          </Text>
+          <Text style={styles.metric}>
+            Intersection Rect:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.intersectionRect))}
+          </Text>
+          <Text style={styles.metric}>
+            Bounding Client Rect:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.boundingClientRect))}
+          </Text>
+          <Text style={styles.metric}>
+            Root Bounds:{' '}
+            {JSON.stringify(roundRect(intersectionEntry.rootBounds))}
+          </Text>
+        </View>
+      )}
+    </>
+  );
+}
+
+const styles = StyleSheet.create({
+  inputContainer: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: 10,
+    gap: 10,
+    paddingHorizontal: 10,
+  },
+  label: {
+    fontSize: 14,
+    fontWeight: 'bold',
+  },
+  input: {
+    borderWidth: 1,
+    borderColor: '#ccc',
+    padding: 5,
+    width: 80,
+    fontSize: 14,
+  },
+  currentMargin: {
+    fontSize: 14,
+    marginBottom: 5,
+    paddingHorizontal: 10,
+    fontStyle: 'italic',
+  },
+  description: {
+    fontSize: 13,
+    marginBottom: 15,
+    paddingHorizontal: 10,
+    color: '#555',
+  },
+  visualizationContainer: {
+    position: 'relative',
+    alignSelf: 'center',
+    marginBottom: 20,
+  },
+  conceptualRoot: {
+    width: 200,
+    height: 200,
+    backgroundColor: 'transparent',
+  },
+  clipping: {
+    height: 100,
+    width: 100,
+    overflow: 'hidden',
+    backgroundColor: 'orange',
+    borderWidth: 2,
+    borderColor: '#999',
+  },
+  target: {
+    backgroundColor: 'rgba(255, 0, 0, 0.5)',
+    height: 100,
+    width: 100,
+    marginTop: 50,
+  },
+  indicatorContainer: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    width: 200,
+    height: 200,
+  },
+  rootIndicator: {
+    position: 'absolute',
+    top: 0,
+    left: 0,
+    width: 200,
+    height: 200,
+    borderWidth: 2,
+    borderColor: 'orange',
+    borderStyle: 'dashed',
+  },
+  targetIndicator: {
+    position: 'absolute',
+    top: 50,
+    left: 0,
+    width: 100,
+    height: 100,
+    borderWidth: 2,
+    borderColor: 'red',
+    borderStyle: 'dashed',
+  },
+  rootMarginIndicator: {
+    position: 'absolute',
+    borderWidth: 3,
+    borderColor: 'rgba(128, 0, 128, 0.6)',
+    borderStyle: 'dashed',
+  },
+  indicatorLabel: {
+    fontSize: 10,
+    color: '#333',
+    fontWeight: 'bold',
+    backgroundColor: 'rgba(255, 255, 255, 0.8)',
+    padding: 2,
+    position: 'absolute',
+  },
+  rootLabel: {
+    top: 5,
+    left: 5,
+  },
+  targetLabel: {
+    top: 40,
+    left: 5,
+  },
+  rootMarginLabel: {
+    bottom: 5,
+    right: 5,
+  },
+  legend: {
+    flexDirection: 'row',
+    flexWrap: 'wrap',
+    paddingHorizontal: 10,
+    marginBottom: 15,
+    gap: 15,
+  },
+  legendItem: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 5,
+  },
+  legendBox: {
+    width: 20,
+    height: 20,
+    borderWidth: 1,
+  },
+  legendClipping: {
+    backgroundColor: 'orange',
+    borderColor: '#999',
+  },
+  legendRoot: {
+    backgroundColor: 'transparent',
+    borderColor: 'orange',
+    borderStyle: 'dashed',
+    borderWidth: 2,
+  },
+  legendTarget: {
+    backgroundColor: 'rgba(255, 0, 0, 0.5)',
+    borderColor: 'red',
+  },
+  legendIndicator: {
+    backgroundColor: 'transparent',
+    borderStyle: 'dashed',
+    borderColor: '#333',
+  },
+  legendRootMargin: {
+    backgroundColor: 'transparent',
+    borderStyle: 'dashed',
+    borderColor: 'rgba(128, 0, 128, 0.6)',
+    borderWidth: 2,
+  },
+  legendText: {
+    fontSize: 12,
+  },
+  metricsContainer: {
+    paddingHorizontal: 10,
+    backgroundColor: '#f5f5f5',
+    padding: 10,
+    borderRadius: 5,
+    marginHorizontal: 10,
+  },
+  metricsTitle: {
+    fontSize: 14,
+    fontWeight: 'bold',
+    marginBottom: 5,
+  },
+  metric: {
+    fontSize: 12,
+    marginBottom: 3,
+    fontFamily: 'monospace',
+  },
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRoot.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRoot.js
new file mode 100644
index 00000000000..f569b586523
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRoot.js
@@ -0,0 +1,278 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow strict-local
+ */
+
+import type {HostInstance} from 'react-native';
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+import type IntersectionObserverEntry from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserverEntry';
+
+import {RNTesterThemeContext} from '../../components/RNTesterTheme';
+import * as React from 'react';
+import {
+  useCallback,
+  useContext,
+  useLayoutEffect,
+  useMemo,
+  useRef,
+  useState,
+} from 'react';
+import {
+  Button,
+  PanResponder,
+  StyleSheet,
+  Text,
+  TextInput,
+  View,
+} from 'react-native';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export const name = 'IntersectionObserver Explicit Root Example';
+export const title = name;
+export const description =
+  'Move target to see intersection ratio with explicit observation root change';
+
+export function render(): React.Node {
+  return <IntersectionObserverExplicitRootExample />;
+}
+
+/**
+ * Showcase threshold of two overlapping elements
+ */
+function IntersectionObserverExplicitRootExample(): React.Node {
+  const theme = useContext(RNTesterThemeContext);
+  const rootRef = useRef<?HostInstance>(null);
+  const targetRef = useRef<?HostInstance>(null);
+  const [position, setPosition] = useState({left: 20, top: 20});
+  const [intersectionRatio, setIntersectionRatio] = useState(0);
+  const [rootMarginInput, setRootMarginInput] = useState<string>('0');
+  const [rootMarginUnit, setRootMarginUnit] = useState<'px' | '%'>('px');
+  const [rootMarginValue, setRootMarginValue] = useState<string>('0px');
+
+  const handleSubmit = useCallback(() => {
+    const marginValue = `${rootMarginInput}${rootMarginUnit}`;
+    setRootMarginValue(marginValue);
+  }, [rootMarginInput, rootMarginUnit]);
+
+  const panResponder = useMemo(
+    () =>
+      PanResponder.create({
+        onStartShouldSetPanResponder: () => true,
+        onMoveShouldSetPanResponder: () => true,
+        onPanResponderMove: (evt, gestureState) => {
+          setPosition({
+            left: position.left + gestureState.dx,
+            top: position.top + gestureState.dy,
+          });
+        },
+      }),
+    [position],
+  );
+  const onObserve = useCallback(
+    (entries: $ReadOnlyArray<IntersectionObserverEntry>) => {
+      entries.forEach(entry => {
+        setIntersectionRatio(entry.intersectionRatio);
+      });
+    },
+    [],
+  );
+
+  const observer = useRef<?IntersectionObserver>(null);
+  useLayoutEffect(() => {
+    const rootNode = rootRef.current;
+    const targetNode = targetRef.current;
+
+    if (rootNode == null || targetNode == null) {
+      return;
+    }
+
+    observer.current = new IntersectionObserver(onObserve, {
+      // $FlowFixMe[incompatible-type]
+      root: rootNode,
+      // $FlowExpectedError[prop-missing] rootMargin is not even defined in Flow.
+      rootMargin: rootMarginValue,
+    });
+    // $FlowFixMe[incompatible-type]
+    observer.current.observe(targetNode);
+    return () => {
+      if (rootNode == null || targetNode == null) {
+        observer.current?.disconnect();
+      }
+      // $FlowFixMe[incompatible-type]
+      observer.current?.unobserve(targetNode);
+    };
+  }, [position, onObserve, rootMarginValue]);
+
+  const textStyle = useMemo(() => {
+    return {color: theme.LabelColor};
+  }, [theme]);
+
+  const ROOT_SIZE = 300;
+  const rootMarginNumeric = parseFloat(rootMarginInput) || 0;
+  const rootMarginInPixels =
+    rootMarginUnit === '%'
+      ? (rootMarginNumeric / 100) * ROOT_SIZE
+      : rootMarginNumeric;
+
+  // Calculate margin indicator dimensions and position
+  // For positive margins: indicator is larger and positioned outside
+  // For negative margins: indicator is smaller and positioned inside
+  const marginIndicatorSize = ROOT_SIZE + 2 * rootMarginInPixels;
+  const marginIndicatorOffset = -rootMarginInPixels;
+
+  return (
+    <View
+      style={[
+        styles.container,
+        {backgroundColor: theme.SystemBackgroundColor},
+      ]}>
+      <Text style={[textStyle, styles.instruction]}>
+        Change rootMargin and then hit 'Apply' to update IntersectionObserver
+      </Text>
+      <View style={styles.controls}>
+        <Text style={[textStyle, styles.controlLabel]}>Root Margin:</Text>
+        <TextInput
+          style={[styles.input, {color: theme.LabelColor}]}
+          value={rootMarginInput}
+          onChangeText={setRootMarginInput}
+          keyboardType="numeric"
+          placeholder="0"
+        />
+        <View style={styles.radioGroup}>
+          <View style={styles.radioOption}>
+            <Button
+              title="px"
+              onPress={() => setRootMarginUnit('px')}
+              color={rootMarginUnit === 'px' ? '#007AFF' : '#999'}
+            />
+          </View>
+          <View style={styles.radioOption}>
+            <Button
+              title="%"
+              onPress={() => setRootMarginUnit('%')}
+              color={rootMarginUnit === '%' ? '#007AFF' : '#999'}
+            />
+          </View>
+        </View>
+        <Button title="Apply" onPress={handleSubmit} />
+      </View>
+      <Text style={[textStyle, styles.currentMargin]}>
+        Current Root Margin: {rootMarginValue}
+      </Text>
+      <View style={[styles.visualizationContainer, styles.center]}>
+        <View style={styles.visualizationWrapper}>
+          <View
+            ref={rootRef}
+            style={[
+              styles.root,
+              styles.center,
+              {backgroundColor: theme.SystemFillColor},
+            ]}>
+            <Text style={textStyle}>Root</Text>
+            <View
+              {...panResponder.panHandlers}
+              ref={targetRef}
+              style={[
+                styles.target,
+                styles.center,
+                {
+                  backgroundColor: theme.SecondarySystemFillColor,
+                  transform: [
+                    {translateX: position.left},
+                    {translateY: position.top},
+                  ],
+                },
+              ]}>
+              <Text style={textStyle}>Target: Drag Me Around</Text>
+              <Text style={textStyle}>
+                Intersection Ratio: {`${Math.floor(intersectionRatio * 100)}%`}
+              </Text>
+            </View>
+          </View>
+          <View
+            style={[
+              styles.marginIndicator,
+              {
+                position: 'absolute',
+                top: marginIndicatorOffset,
+                left: marginIndicatorOffset,
+                width: marginIndicatorSize,
+                height: marginIndicatorSize,
+                borderColor: 'rgba(255, 0, 0, 0.5)',
+                borderWidth: 2,
+                borderStyle: 'dashed',
+                pointerEvents: 'none',
+              },
+            ]}
+          />
+        </View>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  center: {
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  controls: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    padding: 10,
+    gap: 10,
+  },
+  controlLabel: {
+    fontSize: 14,
+    fontWeight: 'bold',
+  },
+  instruction: {
+    padding: 10,
+  },
+  input: {
+    borderWidth: 1,
+    borderColor: '#ccc',
+    padding: 5,
+    width: 80,
+    fontSize: 14,
+  },
+  radioGroup: {
+    flexDirection: 'row',
+    gap: 5,
+  },
+  radioOption: {
+    marginHorizontal: 5,
+  },
+  currentMargin: {
+    fontSize: 14,
+    paddingHorizontal: 10,
+    marginBottom: 10,
+    fontStyle: 'italic',
+  },
+  visualizationContainer: {
+    flex: 1,
+  },
+  visualizationWrapper: {
+    position: 'relative',
+    width: 300,
+    height: 300,
+  },
+  marginIndicator: {
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  root: {
+    width: 300,
+    height: 300,
+  },
+  target: {padding: 10, position: 'absolute'},
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRootScroll.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRootScroll.js
new file mode 100644
index 00000000000..dd6c381569b
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverExplicitRootScroll.js
@@ -0,0 +1,245 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ * @flow strict-local
+ */
+
+import type {HostInstance} from 'react-native';
+import type {PublicScrollViewInstance} from 'react-native/Libraries/Components/ScrollView/ScrollView';
+import type {ViewStyleProp} from 'react-native/Libraries/StyleSheet/StyleSheet';
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+
+import {RNTesterThemeContext} from '../../components/RNTesterTheme';
+import * as React from 'react';
+import {
+  useCallback,
+  useContext,
+  useLayoutEffect,
+  useRef,
+  useState,
+} from 'react';
+import {Button, ScrollView, StyleSheet, Text, View} from 'react-native';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export const name = 'IntersectionObserver Explicit Root MDN Example';
+export const title = name;
+export const description = 'MDN example with an explicit root';
+
+export function render(): React.Node {
+  return <IntersectionObserverExplicitRootScrollExample />;
+}
+
+/**
+ * Showcase threshold of two overlapping elements
+ */
+function IntersectionObserverExplicitRootScrollExample(): React.Node {
+  const theme = useContext(RNTesterThemeContext);
+  const [observationRoot, setObservationRoot] = useState<?HostInstance>(null);
+
+  const [showMargin, setShowMargin] = useState(true);
+  const roofRef: React.RefSetter<PublicScrollViewInstance> = useCallback(
+    (rootNode: ?PublicScrollViewInstance) => {
+      if (rootNode != null) {
+        setObservationRoot(rootNode);
+      }
+
+      return () => {
+        setObservationRoot(null);
+      };
+    },
+    [],
+  );
+
+  return (
+    <ScrollView
+      style={{
+        width: '60%',
+        height: '60%',
+        overflow: 'hidden',
+        backgroundColor: theme.BackgroundColor,
+      }}
+      ref={roofRef}>
+      <Button
+        title={`Click to ${showMargin ? 'remove' : 'add'} margin`}
+        onPress={() => {
+          setShowMargin(show => !show);
+        }}
+      />
+      <Text style={[styles.scrollDownText, {color: theme.LabelColor}]}>
+        ↓↓ Scroll down ↓↓
+      </Text>
+      {showMargin ? <View style={styles.margin} /> : null}
+
+      <ListItem
+        position={1}
+        rootNode={observationRoot}
+        threshold={0.5}
+        rootThreshold={0.5}
+        description="Should intersect when item half visible and when item takes up half the viewport"
+      />
+    </ScrollView>
+  );
+}
+
+function ListItem(props: {
+  position: number,
+  rootThreshold?: number,
+  rootNode: ?HostInstance,
+  threshold: number,
+  initialValue?: number,
+  description: string,
+  style?: ?ViewStyleProp,
+}): React.Node {
+  const itemRef = useRef<?HostInstance>(null);
+  const [intersectionRatio, setIntersectionRatio] = useState(
+    props.initialValue ?? 0,
+  );
+  const [intersectionRootRatio, setIntersectionRootRatio] = useState(
+    props.initialValue ?? 0,
+  );
+
+  useLayoutEffect(() => {
+    const itemNode = itemRef.current;
+    if (itemNode == null) {
+      return;
+    }
+
+    if (props.rootNode == null) {
+      return;
+    }
+
+    const intersectionObserver = new IntersectionObserver(
+      entries => {
+        entries.forEach(entry => {
+          setIntersectionRatio(entry.intersectionRatio);
+          // $FlowFixMe[prop-missing] - React Native specific entry property
+          setIntersectionRootRatio(entry.rnRootIntersectionRatio);
+        });
+      },
+      {
+        threshold: props.threshold,
+        rnRootThreshold: props.rootThreshold,
+        // $FlowFixMe[incompatible-type]
+        root: props.rootNode,
+      },
+    );
+
+    // $FlowFixMe[incompatible-type]
+    intersectionObserver.observe(itemNode);
+
+    return () => {
+      intersectionObserver.disconnect();
+    };
+  }, [props.position, props.threshold, props.rootThreshold, props.rootNode]);
+
+  return (
+    <View
+      style={[
+        styles.item,
+        intersectionRatio >= props.threshold ? styles.intersecting : null,
+        intersectionRootRatio >= (props.rootThreshold ?? 1)
+          ? styles.rootIntersecting
+          : null,
+        props.style,
+      ]}
+      ref={itemRef}>
+      <Text style={styles.description}>{props.description}</Text>
+      {props.rootThreshold != null && (
+        <Text>rootThreshold: {props.rootThreshold}</Text>
+      )}
+      <Text>threshold: {props.threshold}</Text>
+
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{left: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{right: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{left: 0, bottom: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{right: 0, bottom: 0}}
+      />
+    </View>
+  );
+}
+
+function IntersectionRatioIndicator(props: {
+  intersectionRatio: number,
+  intersectionRootRatio: number,
+  style: {top?: number, bottom?: number, left?: number, right?: number},
+}): React.Node {
+  return (
+    <View style={[styles.intersectionRatioIndicator, props.style]}>
+      <Text>
+        target ratio: {`${Math.floor(props.intersectionRatio * 100)}%`}
+      </Text>
+      <Text>
+        root ratio: {`${Math.floor(props.intersectionRootRatio * 100)}%`}
+      </Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  scrollDownText: {
+    textAlign: 'center',
+    fontSize: 20,
+    marginTop: 20,
+  },
+  intersecting: {
+    backgroundColor: 'rgb(226, 237, 166)',
+  },
+  rootIntersecting: {
+    backgroundColor: 'rgb(237, 90, 45)',
+  },
+  margin: {
+    marginBottom: 700,
+  },
+  item: {
+    backgroundColor: 'rgb(186, 186, 186)',
+    borderColor: 'rgb(201, 126, 17)',
+    borderWidth: 2,
+    height: 500,
+    margin: 6,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  intersectionRatioIndicator: {
+    position: 'absolute',
+    padding: 5,
+    backgroundColor: 'white',
+    opacity: 0.7,
+    borderWidth: 1,
+    borderColor: 'black',
+  },
+  description: {
+    margin: 20,
+    fontSize: 16,
+  },
+
+  container: {},
+  center: {
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  root: {
+    width: '60%',
+    height: '50%',
+  },
+  target: {padding: 10, position: 'absolute'},
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverIndex.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverIndex.js
new file mode 100644
index 00000000000..47d2dcf4431
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverIndex.js
@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import type {RNTesterModuleExample} from '../../types/RNTesterTypes';
+
+import * as IntersectionObserverBenchmark from './IntersectionObserverBenchmark';
+import * as IntersectionObserverClippingParent from './IntersectionObserverClippingParent';
+import * as IntersectionObserverClippingRoot from './IntersectionObserverClippingRoot';
+import * as IntersectionObserverExplicitRoot from './IntersectionObserverExplicitRoot';
+import * as IntersectionObserverExplicitRootScroll from './IntersectionObserverExplicitRootScroll';
+import * as IntersectionObserverMDNExample from './IntersectionObserverMDNExample';
+import * as IntersectionObserverRootThreshold from './IntersectionObserverRootThreshold';
+
+export const framework = 'React';
+export const title = 'IntersectionObserver';
+export const category = 'UI';
+export const documentationURL =
+  'https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API';
+export const description =
+  'API to detect paint times for elements and changes in their intersections with other elements.';
+export const showIndividualExamples = true;
+export const examples: Array<RNTesterModuleExample> = [
+  IntersectionObserverMDNExample,
+  IntersectionObserverBenchmark,
+  IntersectionObserverRootThreshold,
+  IntersectionObserverExplicitRoot,
+  IntersectionObserverExplicitRootScroll,
+  IntersectionObserverClippingParent,
+  IntersectionObserverClippingRoot,
+];
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverMDNExample.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverMDNExample.js
new file mode 100644
index 00000000000..69858a0dfa7
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverMDNExample.js
@@ -0,0 +1,181 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+
+import {RNTesterThemeContext} from '../../components/RNTesterTheme';
+import * as React from 'react';
+import {
+  type ElementRef,
+  useContext,
+  useLayoutEffect,
+  useRef,
+  useState,
+} from 'react';
+import {Button, ScrollView, StyleSheet, Text, View} from 'react-native';
+
+declare var IntersectionObserver: Class<IntersectionObserverType>;
+
+export const name = 'IntersectionObserver MDN Example';
+export const title = name;
+export const description =
+  'Copy of the example in MDN about IntersectionObserver with different thresholds.';
+
+export function render(): React.Node {
+  return <IntersectionObserverMDNExample />;
+}
+
+/**
+ * Similar to the example in MDN: https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
+ */
+function IntersectionObserverMDNExample(): React.Node {
+  const theme = useContext(RNTesterThemeContext);
+  const [showMargin, setShowMargin] = useState(true);
+
+  return (
+    <ScrollView>
+      <Button
+        title={`Click to ${showMargin ? 'remove' : 'add'} margin`}
+        onPress={() => {
+          setShowMargin(show => !show);
+        }}
+      />
+      <Text style={[styles.scrollDownText, {color: theme.LabelColor}]}>
+        ↓↓ Scroll down ↓↓
+      </Text>
+      {showMargin ? <View style={styles.margin} /> : null}
+      <ListItem position={1} thresholds={buildThresholdList(100)} />
+      <ListItem position={2} thresholds={[0.5]} initialValue={0.49} />
+      <ListItem position={3} thresholds={buildThresholdList(10)} />
+      <ListItem position={4} thresholds={buildThresholdList(4)} />
+    </ScrollView>
+  );
+}
+
+function ListItem(props: {
+  position: number,
+  thresholds: Array<number>,
+  initialValue?: number,
+}): React.Node {
+  const itemRef = useRef<?ElementRef<typeof View>>(null);
+  const intersectionRatioRef = useRef(0);
+  const [intersectionRatio, setIntersectionRatio] = useState(
+    props.initialValue ?? 0,
+  );
+
+  useLayoutEffect(() => {
+    const itemNode = itemRef.current;
+    if (itemNode == null) {
+      return;
+    }
+
+    const intersectionObserver = new IntersectionObserver(
+      entries => {
+        entries.forEach(entry => {
+          if (
+            intersectionRatioRef.current === 0 &&
+            entry.intersectionRatio > 0
+          ) {
+            console.log(
+              `Card #${props.position} switched to intersecting (according to thresholds)`,
+            );
+          } else if (
+            intersectionRatioRef.current !== 0 &&
+            entry.intersectionRatio === 0
+          ) {
+            console.log(
+              `Card #${props.position} switched to NOT intersecting (according to thresholds)`,
+            );
+          }
+          intersectionRatioRef.current = entry.intersectionRatio;
+          setIntersectionRatio(entry.intersectionRatio);
+        });
+      },
+      {threshold: props.thresholds},
+    );
+
+    // $FlowFixMe[incompatible-type]
+    intersectionObserver.observe(itemNode);
+
+    return () => {
+      intersectionObserver.disconnect();
+    };
+  }, [props.position, props.thresholds]);
+
+  return (
+    <View style={styles.item} ref={itemRef}>
+      <IntersectionRatioIndicator
+        value={intersectionRatio}
+        style={{left: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        value={intersectionRatio}
+        style={{right: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        value={intersectionRatio}
+        style={{left: 0, bottom: 0}}
+      />
+      <IntersectionRatioIndicator
+        value={intersectionRatio}
+        style={{right: 0, bottom: 0}}
+      />
+    </View>
+  );
+}
+
+function IntersectionRatioIndicator(props: {
+  value: number,
+  style: {top?: number, bottom?: number, left?: number, right?: number},
+}): React.Node {
+  return (
+    <View style={[styles.intersectionRatioIndicator, props.style]}>
+      <Text>{`${Math.floor(props.value * 100)}%`}</Text>
+    </View>
+  );
+}
+
+function buildThresholdList(numSteps: number): Array<number> {
+  const thresholds = [];
+
+  for (let i = 1.0; i <= numSteps; i++) {
+    const ratio = i / numSteps;
+    thresholds.push(ratio);
+  }
+
+  thresholds.push(0);
+  return thresholds;
+}
+
+const styles = StyleSheet.create({
+  scrollDownText: {
+    textAlign: 'center',
+    fontSize: 20,
+    marginTop: 20,
+  },
+  margin: {
+    marginBottom: 700,
+  },
+  item: {
+    backgroundColor: 'rgb(245, 170, 140)',
+    borderColor: 'rgb(201, 126, 17)',
+    borderWidth: 2,
+    height: 500,
+    margin: 6,
+  },
+  intersectionRatioIndicator: {
+    position: 'absolute',
+    padding: 5,
+    backgroundColor: 'white',
+    opacity: 0.7,
+    borderWidth: 1,
+    borderColor: 'black',
+  },
+});
diff --git a/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverRootThreshold.js b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverRootThreshold.js
new file mode 100644
index 00000000000..393d05aa443
--- /dev/null
+++ b/packages/@react-native/tester/js/examples/IntersectionObserver/IntersectionObserverRootThreshold.js
@@ -0,0 +1,224 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @flow strict-local
+ * @format
+ */
+
+import type {ViewStyleProp} from 'react-native/Libraries/StyleSheet/StyleSheet';
+import type IntersectionObserverType from 'react-native/src/private/webapis/intersectionobserver/IntersectionObserver';
+
+import {RNTesterThemeContext} from '../../components/RNTesterTheme';
+import * as React from 'react';
+import {
+  type ElementRef,
+  useContext,
+  useLayoutEffect,
+  useRef,
+  useState,
+} from 'react';
+import {Button, ScrollView, StyleSheet, Text, View} from 'react-native';
+
+declare const IntersectionObserver: Class<IntersectionObserverType>;
+
+export const name = 'IntersectionObserver Root Threshold';
+export const title = name;
+export const description =
+  'Examples of setting threshold and rnRootThreshold. Views will change background color if they meet their threshold.';
+
+export function render(): React.Node {
+  return <IntersectionObserverRootThreshold />;
+}
+
+/**
+ * Similar to the example in MDN: https://developer.mozilla.org/en-US/docs/Web/API/Intersection_Observer_API
+ */
+function IntersectionObserverRootThreshold(): React.Node {
+  const theme = useContext(RNTesterThemeContext);
+  const [showMargin, setShowMargin] = useState(true);
+
+  return (
+    <ScrollView>
+      <Button
+        title={`Click to ${showMargin ? 'remove' : 'add'} margin`}
+        onPress={() => {
+          setShowMargin(show => !show);
+        }}
+      />
+      <Text style={[styles.scrollDownText, {color: theme.LabelColor}]}>
+        ↓↓ Scroll down ↓↓
+      </Text>
+      {showMargin ? <View style={styles.margin} /> : null}
+
+      <ListItem
+        position={1}
+        rootThreshold={0.5}
+        threshold={0.5}
+        description="Should intersect when item half visible and when item takes up half the viewport"
+      />
+      <ListItem
+        position={2}
+        rootThreshold={0.5}
+        threshold={1}
+        description="Should intersect when view takes up half of viewport and when item is fully visible"
+      />
+      <ListItem
+        position={3}
+        threshold={1}
+        rootThreshold={0}
+        description="This should intersect when any part is visible, even though `thresholds` is 1"
+      />
+      <ListItem
+        position={4}
+        rootThreshold={1}
+        threshold={1}
+        description="Since this item is smaller than viewport, should only intersect when view is fully visible"
+      />
+      <ListItem
+        position={1}
+        rootThreshold={1}
+        threshold={1}
+        style={{height: 1000}}
+        description="This list item is larger than viewport and should intersect when it takes up all of viewport. However, this is impossible because of clipping of the scrollview. However, if we set `root` to the scrollview, we can."
+      />
+    </ScrollView>
+  );
+}
+
+function ListItem(props: {
+  position: number,
+  rootThreshold: number,
+  threshold: number,
+  initialValue?: number,
+  description: string,
+  style?: ?ViewStyleProp,
+}): React.Node {
+  const itemRef = useRef<?ElementRef<typeof View>>(null);
+  const [intersectionRatio, setIntersectionRatio] = useState(
+    props.initialValue ?? 0,
+  );
+  const [intersectionRootRatio, setIntersectionRootRatio] = useState(
+    props.initialValue ?? 0,
+  );
+
+  useLayoutEffect(() => {
+    const itemNode = itemRef.current;
+    if (itemNode == null) {
+      return;
+    }
+
+    const intersectionObserver = new IntersectionObserver(
+      entries => {
+        entries.forEach(entry => {
+          setIntersectionRatio(entry.intersectionRatio);
+          // $FlowFixMe[prop-missing] - React Native specific entry property
+          setIntersectionRootRatio(entry.rnRootIntersectionRatio);
+        });
+      },
+      {threshold: props.threshold, rnRootThreshold: props.rootThreshold},
+    );
+
+    // $FlowFixMe[incompatible-type]
+    intersectionObserver.observe(itemNode);
+
+    return () => {
+      intersectionObserver.disconnect();
+    };
+  }, [props.position, props.threshold, props.rootThreshold]);
+
+  return (
+    <View
+      style={[
+        styles.item,
+        intersectionRatio >= props.threshold ? styles.intersecting : null,
+        intersectionRootRatio >= props.rootThreshold
+          ? styles.rootIntersecting
+          : null,
+        props.style,
+      ]}
+      ref={itemRef}>
+      <Text style={styles.description}>{props.description}</Text>
+      <Text>rnRootThreshold: {props.rootThreshold}</Text>
+      <Text>threshold: {props.threshold}</Text>
+
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{left: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{right: 0, top: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{left: 0, bottom: 0}}
+      />
+      <IntersectionRatioIndicator
+        intersectionRatio={intersectionRatio}
+        intersectionRootRatio={intersectionRootRatio}
+        style={{right: 0, bottom: 0}}
+      />
+    </View>
+  );
+}
+
+function IntersectionRatioIndicator(props: {
+  intersectionRatio: number,
+  intersectionRootRatio: number,
+  style: {top?: number, bottom?: number, left?: number, right?: number},
+}): React.Node {
+  return (
+    <View style={[styles.intersectionRatioIndicator, props.style]}>
+      <Text>
+        target ratio: {`${Math.floor(props.intersectionRatio * 100)}%`}
+      </Text>
+      <Text>
+        root ratio: {`${Math.floor(props.intersectionRootRatio * 100)}%`}
+      </Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  scrollDownText: {
+    textAlign: 'center',
+    fontSize: 20,
+    marginTop: 20,
+  },
+  intersecting: {
+    backgroundColor: 'rgb(226, 237, 166)',
+  },
+  rootIntersecting: {
+    backgroundColor: 'rgb(237, 90, 45)',
+  },
+  margin: {
+    marginBottom: 700,
+  },
+  item: {
+    backgroundColor: 'rgb(186, 186, 186)',
+    borderColor: 'rgb(201, 126, 17)',
+    borderWidth: 2,
+    height: 500,
+    margin: 6,
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+  intersectionRatioIndicator: {
+    position: 'absolute',
+    padding: 5,
+    backgroundColor: 'white',
+    opacity: 0.7,
+    borderWidth: 1,
+    borderColor: 'black',
+  },
+  description: {
+    margin: 20,
+    fontSize: 16,
+  },
+});
diff --git a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
index 72e854fdb21..07ccf7e5a04 100644
--- a/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
+++ b/vnext/ReactCommon/TEMP_UntilReactCommonUpdate/cxxreact/JSIndexedRAMBundle.cpp
@@ -76,7 +76,7 @@ void JSIndexedRAMBundle::init() {
   readBundle(reinterpret_cast<char*>(m_table.data.get()), m_table.byteLength());
 
   // read the startup code
-  m_startupCode = std::make_unique<JSBigBufferString>(startupCodeSize - 1);
+  m_startupCode = std::make_unique<JSBigBufferString>(static_cast<size_t>(startupCodeSize - 1)); //Windows #15782
 
   readBundle(m_startupCode->mutableData(), startupCodeSize - 1);
 }