Migrate RNTester to use {usesCleartextTraffic} Manifest Placeholder (#52620)

Summary:
This creates a `debugOptimized` build type for React Native Android, meaning that we can run C++ optimization on the debug build, while still having the debugger enabled. This is aimed at improving the developer experience for folks developing on low-end devices or emulators.

Users that intend to debug can still use the `debug` variant where the full debug symbols are shipped.

## Changelog:

[ANDROID] [ADDED] - Create a debugOptimized buildType for Android


Test Plan:
Tested locally with RNTester by doing:

```
./gradlew installDebugOptimized
```

This is the output of the 3 generated .aar. The size difference is a proof that we're correctly stripping out the C++ debug symbols:

<img width="193" height="54" alt="Screenshot 2025-07-15 at 17 49 50" src="https://github.com/user-attachments/assets/584a0e8d-2d17-40d4-ac29-da09049d6554" />
<img width="235" height="51" alt="Screenshot 2025-07-15 at 17 49 39" src="https://github.com/user-attachments/assets/eda8f9e7-3509-4334-8c16-990e55caa04d" />
<img width="184" height="52" alt="Screenshot 2025-07-15 at 17 49 32" src="https://github.com/user-attachments/assets/a5c94385-bc00-4484-b43e-088ee039827f" />

Rollback Plan:

Reviewed By: cipolleschi

Differential Revision: D78351347

Pulled By: cortinico

.editorconfig

@@ -9,12 +9,3 @@ end_of_line = lf
 insert_final_newline = true
 indent_style = space
 indent_size = 2
-
-[*.gradle]
-indent_size = 4
-
-[*.kts]
-indent_size = 4
-
-[BUCK]
-indent_size = 4

.eslintignore

@@ -13,7 +13,6 @@ packages/*/dist
 packages/*/types_generated
 packages/debugger-frontend/dist/**/*
 packages/react-native-codegen/lib
-tools/eslint/rules/sort-imports.js
 **/Pods/*
 **/*.macos.js
 **/*.windows.js

.eslintrc.js

@@ -4,21 +4,18 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
+ * @noflow
  * @format
  */
 
 'use strict';
 
-const path = require('node:path');
-
-require('eslint-plugin-lint').load(path.join(__dirname, 'tools/eslint/rules'));
-
 module.exports = {
   root: true,
 
   extends: ['@react-native'],
 
-  plugins: ['@react-native/eslint-plugin-specs', 'lint'],
+  plugins: ['@react-native/monorepo', '@react-native/specs'],
 
   overrides: [
     // overriding the JS config from @react-native/eslint-config to ensure
@@ -27,28 +24,34 @@ module.exports = {
       files: ['*.js', '*.js.flow', '*.jsx'],
       parser: 'hermes-eslint',
       rules: {
+        '@react-native/monorepo/sort-imports': 'warn',
+        'eslint-comments/no-unlimited-disable': 'off',
+        'ft-flow/require-valid-file-annotation': ['error', 'always'],
+        'no-extra-boolean-cast': 'off',
+        'no-void': 'off',
         // These rules are not required with hermes-eslint
-        'ft-flow/define-flow-type': 0,
-        'ft-flow/use-flow-type': 0,
-        'lint/sort-imports': 1,
-        // flow handles this check for us, so it's not required
-        'no-undef': 0,
+        'ft-flow/define-flow-type': 'off',
+        'ft-flow/use-flow-type': 'off',
+        // Flow handles these checks for us, so they aren't required
+        'no-undef': 'off',
+        'no-unreachable': 'off',
       },
     },
     {
       files: ['*.js', '*.jsx', '*.ts', '*.tsx'],
       rules: {
-        '@react-native/no-deep-imports': 0,
+        '@react-native/no-deep-imports': 'off',
       },
     },
     {
       files: [
-        './packages/react-native/**/*.{js,flow}',
+        './packages/react-native/Libraries/**/*.{js,flow}',
+        './packages/react-native/src/**/*.{js,flow}',
         './packages/assets/registry.js',
       ],
       parser: 'hermes-eslint',
       rules: {
-        'lint/no-commonjs-exports': 1,
+        '@react-native/monorepo/no-commonjs-exports': 'warn',
       },
     },
     {
@@ -58,15 +61,17 @@ module.exports = {
     {
       files: ['package.json'],
       rules: {
-        'lint/react-native-manifest': 2,
+        '@react-native/monorepo/react-native-manifest': 'error',
       },
     },
     {
-      files: ['flow-typed/**/*.js'],
+      files: ['flow-typed/**/*.js', 'packages/react-native/flow/**/*'],
       rules: {
-        'lint/valid-flow-typed-signature': 2,
-        'no-unused-vars': 0,
-        quotes: 0,
+        '@react-native/monorepo/valid-flow-typed-signature': 'error',
+        'ft-flow/require-valid-file-annotation': 'off',
+        'no-shadow': 'off',
+        'no-unused-vars': 'off',
+        quotes: 'off',
       },
     },
     {
@@ -75,14 +80,14 @@ module.exports = {
         'packages/react-native/src/**/*.js',
       ],
       rules: {
-        '@react-native/platform-colors': 2,
-        '@react-native/specs/react-native-modules': 2,
-        'lint/no-haste-imports': 2,
-        'lint/no-react-native-imports': 2,
-        'lint/require-extends-error': 2,
-        'lint/no-react-node-imports': 2,
-        'lint/no-react-default-imports': 2,
-        'lint/no-react-named-type-imports': 2,
+        '@react-native/monorepo/no-haste-imports': 'error',
+        '@react-native/monorepo/no-react-default-imports': 'error',
+        '@react-native/monorepo/no-react-named-type-imports': 'error',
+        '@react-native/monorepo/no-react-native-imports': 'error',
+        '@react-native/monorepo/no-react-node-imports': 'error',
+        '@react-native/monorepo/require-extends-error': 'error',
+        '@react-native/platform-colors': 'error',
+        '@react-native/specs/react-native-modules': 'error',
       },
     },
     {
@@ -134,9 +139,9 @@ module.exports = {
       },
     },
     {
-      files: ['**/*-itest{.fb,}.js'],
+      files: ['**/__tests__/**'],
       rules: {
-        'lint/no-react-native-imports': 'off',
+        '@react-native/monorepo/no-react-native-imports': 'off',
       },
     },
   ],

.flowconfig

@@ -9,7 +9,7 @@
 <PROJECT_ROOT>/packages/react-native-codegen/e2e/__test_fixtures__/modules/NativeEnumTurboModule.js
 
 ; Ignore the Dangerfile
-<PROJECT_ROOT>/packages/react-native-bots/dangerfile.js
+<PROJECT_ROOT>/private/react-native-bots/dangerfile.js
 
 ; Ignore "BUCK" generated dirs
 <PROJECT_ROOT>/\.buckd/
@@ -27,7 +27,7 @@
 <PROJECT_ROOT>/packages/.*/dist
 
 ; helloworld
-<PROJECT_ROOT>/packages/helloworld/ios/Pods/
+<PROJECT_ROOT>/private/helloworld/ios/Pods/
 
 ; Ignore rn-tester Pods
 <PROJECT_ROOT>/packages/rn-tester/Pods/
@@ -44,11 +44,12 @@
 flow-typed/
 packages/react-native/interface.js
 packages/react-native/flow/
-packages/react-native/src/types/
 
 [options]
 enums=true
+experimental.pattern_matching=true
 casting_syntax=both
+component_syntax=true
 
 emoji=true
 
@@ -70,6 +71,8 @@ module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/packages/react-nat
 module.name_mapper='^@react-native/dev-middleware$' -> '<PROJECT_ROOT>/packages/dev-middleware'
 module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\|xml\)$' -> '<PROJECT_ROOT>/packages/react-native/Libraries/Image/RelativeImageStub'
 
+module.system.haste.module_ref_prefix=m#
+
 react.runtime=automatic
 
 suppress_type=$FlowIssue
@@ -101,4 +104,4 @@ untyped-import
 untyped-type-import
 
 [version]
-^0.269.1
+^0.275.0

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -83,7 +83,7 @@ body:
             path: /bin/zsh
         Binaries:
           Node: ...
-            version: 18.14.0
+            version: 22.14.0
         ...
       render: text
     validations:

.github/ISSUE_TEMPLATE/debugger_bug_report.yml

@@ -62,7 +62,7 @@ body:
             path: /bin/zsh
         Binaries:
           Node: ...
-            version: 18.14.0
+            version: 22.14.0
         ...
       render: text
     validations:

.github/ISSUE_TEMPLATE/new_architecture_bug_report.yml

@@ -95,7 +95,7 @@ body:
             path: /bin/zsh
         Binaries:
           Node: ...
-            version: 18.14.0
+            version: 22.14.0
         ...
       render: text
     validations:

.github/actions/build-android/action.yml

@@ -86,27 +86,13 @@ runs:
       if: ${{ always() }}
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: rntester-hermes-debug
-        path: packages/rn-tester/android/app/build/outputs/apk/hermes/debug/
+        name: rntester-debug
+        path: packages/rn-tester/android/app/build/outputs/apk/debug/
         compression-level: 0
     - name: Upload RNTester APK - hermes-release
       if: ${{ always() }}
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: rntester-hermes-release
-        path: packages/rn-tester/android/app/build/outputs/apk/hermes/release/
-        compression-level: 0
-    - name: Upload RNTester APK - jsc-debug
-      if: ${{ always() }}
-      uses: actions/upload-artifact@v4.3.4
-      with:
-        name: rntester-jsc-debug
-        path: packages/rn-tester/android/app/build/outputs/apk/jsc/debug/
-        compression-level: 0
-    - name: Upload RNTester APK - jsc-release
-      if: ${{ always() }}
-      uses: actions/upload-artifact@v4.3.4
-      with:
-        name: rntester-jsc-release
-        path: packages/rn-tester/android/app/build/outputs/apk/jsc/release/
+        name: rntester-release
+        path: packages/rn-tester/android/app/build/outputs/apk/release/
         compression-level: 0

.github/actions/build-hermesc-windows/action.yml

@@ -14,23 +14,23 @@ runs:
       uses: actions/download-artifact@v4
       with:
         name: hermes-workspace
-        path: 'D:\tmp\hermes'
+        path: 'C:\tmp\hermes'
     - name: Set up workspace
       shell: powershell
       run: |
-        mkdir -p D:\tmp\hermes\osx-bin
+        mkdir -p C:\tmp\hermes\osx-bin
         mkdir -p .\packages\react-native\sdks\hermes
-        cp -r -Force D:\tmp\hermes\hermes\* .\packages\react-native\sdks\hermes\.
+        cp -r -Force C:\tmp\hermes\hermes\* .\packages\react-native\sdks\hermes\.
         cp -r -Force .\packages\react-native\sdks\hermes-engine\utils\* .\packages\react-native\sdks\hermes\.
     - name: Windows cache
       uses: actions/cache@v4
       with:
-        key: v2-hermes-${{ github.job }}-windows-${{ inputs.hermes-version }}-${{ inputs.react-native-version }}
+        key: v3-hermes-${{ github.job }}-windows-${{ inputs.hermes-version }}-${{ inputs.react-native-version }}
         path: |
-          D:\tmp\hermes\win64-bin\
-          D:\tmp\hermes\hermes\icu\
-          D:\tmp\hermes\hermes\deps\
-          D:\tmp\hermes\hermes\build_release\
+          C:\tmp\hermes\win64-bin\
+          C:\tmp\hermes\hermes\icu\
+          C:\tmp\hermes\hermes\deps\
+          C:\tmp\hermes\hermes\build_release\
     - name: setup-msbuild
       uses: microsoft/setup-msbuild@v1.3.2
     - name: Set up workspace
@@ -63,7 +63,7 @@ runs:
           $Env:PATH += ";$Env:CMAKE_DIR;$Env:MSBUILD_DIR"
           $Env:ICU_ROOT = "$Env:HERMES_WS_DIR\icu"
 
-          cmake -S hermes -B build_release -G 'Visual Studio 16 2019' -Ax64 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=True -DHERMES_ENABLE_WIN10_ICU_FALLBACK=OFF
+          cmake -S hermes -B build_release -G 'Visual Studio 17 2022' -Ax64 -DCMAKE_BUILD_TYPE=Release -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=True -DHERMES_ENABLE_WIN10_ICU_FALLBACK=OFF
           if (-not $?) { throw "Failed to configure Hermes" }
           echo "Running windows build..."
           cd build_release
@@ -83,4 +83,4 @@ runs:
       uses: actions/upload-artifact@v4.3.4
       with:
         name: hermes-win64-bin
-        path: D:\tmp\hermes\win64-bin\
+        path: C:\tmp\hermes\win64-bin\

.github/actions/build-npm-package/action.yml

@@ -107,6 +107,12 @@ runs:
         pattern: ReactNativeDependencies*
         path: ./packages/react-native/ReactAndroid/external-artifacts/artifacts
         merge-multiple: true
+    - name: Download ReactCore artifacts
+      uses: actions/download-artifact@v4
+      with:
+        pattern: ReactCore*
+        path: ./packages/react-native/ReactAndroid/external-artifacts/artifacts
+        merge-multiple: true
     - name: Print Artifacts Directory
       shell: bash
       run: ls -lR ./packages/react-native/ReactAndroid/external-artifacts/artifacts/
@@ -123,7 +129,7 @@ runs:
       run: yarn build
     - name: Build types
       shell: bash
-      run: yarn build-types
+      run: yarn build-types --skip-snapshot
     # Continue with publish steps
     - name: Set npm credentials
       if: ${{ inputs.release-type == 'release' ||

.github/actions/diff-js-api-breaking-changes/action.yml

@@ -0,0 +1,23 @@
+name: diff-js-api-breaking-changes
+description: Check for breaking changes in the public React Native JS API
+runs:
+  using: composite
+  steps:
+    - name: Fetch snapshot from PR head
+      shell: bash
+      env:
+        SCRATCH_DIR: ${{ runner.temp }}/diff-js-api-breaking-changes
+      run: |
+        mkdir $SCRATCH_DIR
+        git fetch --depth=1 origin ${{ github.event.pull_request.head.sha }}
+        git show ${{ github.event.pull_request.head.sha }}:packages/react-native/ReactNativeApi.d.ts > $SCRATCH_DIR/ReactNativeApi-after.d.ts \
+          || echo "" > $SCRATCH_DIR/ReactNativeApi.d.ts
+    - name: Run breaking change detection
+      shell: bash
+      env:
+        SCRATCH_DIR: ${{ runner.temp }}/diff-js-api-breaking-changes
+      run: |
+        node ./scripts/js-api/diff-api-snapshot \
+        ${{ github.workspace }}/packages/react-native/ReactNativeApi.d.ts  \
+        $SCRATCH_DIR/ReactNativeApi-after.d.ts \
+        > $SCRATCH_DIR/output.json

.github/actions/lint/action.yml

@@ -4,7 +4,7 @@ inputs:
   node-version:
     description: "The node.js version to use"
     required: false
-    default: "20"
+    default: "22"
   github-token:
     description: "The GitHub token used by pull-bot"
     required: true
@@ -26,15 +26,12 @@ runs:
     - name: Lint code
       shell: bash
       run: ./.github/workflow-scripts/exec_swallow_error.sh yarn lint --format junit -o ./reports/junit/eslint/results.xml
-    - name: Lint java
-      shell: bash
-      run: ./.github/workflow-scripts/exec_swallow_error.sh yarn lint-java --check
     - name: Lint file structure
       shell: bash
       run: ./.github/workflow-scripts/lint_files.sh
     - name: Verify not committing repo after running build
       shell: bash
-      run: yarn run build --check
+      run: yarn run build --validate
     - name: Run flowcheck
       shell: bash
       run: yarn flow-check
@@ -50,3 +47,9 @@ runs:
     - name: Lint markdown
       shell: bash
       run: yarn run lint-markdown
+    - name: Build types
+      shell: bash
+      run: yarn build-types --skip-snapshot
+    - name: Run typescript check of generated types
+      shell: bash
+      run: yarn test-generated-typescript

.github/actions/maestro-android/action.yml

@@ -1,5 +1,5 @@
 name: Maestro E2E Android
-description: Runs E2E Tests on iOS using Maestro
+description: Runs E2E Tests on Android using Maestro
 inputs:
   app-path:
     required: true
@@ -7,9 +7,6 @@ inputs:
   app-id:
     required: true
     description: The id of the app to test
-  jsengine:
-    required: true
-    description: The js engine we are using
   maestro-flow:
     required: true
     description: the folder that contains the maestro tests
@@ -25,10 +22,6 @@ inputs:
     required: false
     default: "."
     description: The directory from which metro should be started
-  architecture:
-    required: false
-    default: "NewArch"
-    description: The react native architecture to test
 
 runs:
   using: composite
@@ -79,7 +72,7 @@ runs:
       uses: actions/upload-artifact@v4.3.4
       if: always()
       with:
-        name: e2e_android_${{ steps.normalize-app-id.outputs.app-id }}_report_${{ inputs.jsengine }}_${{ inputs.flavor }}_${{ inputs.architecture }}
+        name: e2e_android_${{ steps.normalize-app-id.outputs.app-id }}_report_${{ inputs.flavor }}_NewArch
         path: |
           report.xml
           screen.mp4
@@ -87,5 +80,5 @@ runs:
       if: steps.run-tests.outcome == 'failure'
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: maestro-logs-android-${{ steps.normalize-app-id.outputs.app-id }}-${{ inputs.jsengine }}-${{ inputs.flavor }}-${{ inputs.architecture }}
+        name: maestro-logs-android-${{ steps.normalize-app-id.outputs.app-id }}-${{ inputs.flavor }}-NewArch
         path: /tmp/MaestroLogs

.github/actions/maestro-ios/action.yml

@@ -7,9 +7,6 @@ inputs:
   app-id:
     required: true
     description: The id of the app to test
-  jsengine:
-    required: true
-    description: The js engine we are using
   maestro-flow:
     required: true
     description: the folder that contains the maestro tests
@@ -21,10 +18,6 @@ inputs:
     required: false
     default: "."
     description: The directory from which metro should be started
-  architecture:
-    required: false
-    default: "NewArch"
-    description: The react native architecture to test
 
 runs:
   using: composite
@@ -66,24 +59,24 @@ runs:
           "${{ inputs.app-path }}" \
           "${{ inputs.app-id }}" \
           "${{ inputs.maestro-flow }}" \
-          "${{ inputs.jsengine }}" \
+          "Hermes" \
           "${{ inputs.flavor }}" \
           "${{ inputs.working-directory }}"
     - name: Store video record
       if: always()
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: e2e_ios_${{ inputs.app-id }}_report_${{ inputs.jsengine }}_${{ inputs.flavor }}_${{ inputs.architecture }}
+        name: e2e_ios_${{ inputs.app-id }}_report_${{ inputs.flavor }}_NewArch
         path: |
-          video_record_${{ inputs.jsengine }}_1.mov
-          video_record_${{ inputs.jsengine }}_2.mov
-          video_record_${{ inputs.jsengine }}_3.mov
-          video_record_${{ inputs.jsengine }}_4.mov
-          video_record_${{ inputs.jsengine }}_5.mov
+          video_record_1.mov
+          video_record_2.mov
+          video_record_3.mov
+          video_record_4.mov
+          video_record_5.mov
           report.xml
     - name: Store Logs
       if: failure() && steps.run-tests.outcome == 'failure'
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: maestro-logs-${{ inputs.app-id }}-${{ inputs.jsengine }}-${{ inputs.flavor }}-${{ inputs.architecture }}
+        name: maestro-logs-${{ inputs.app-id }}-${{ inputs.flavor }}-NewArch
         path: /tmp/MaestroLogs

.github/actions/setup-node/action.yml

@@ -4,7 +4,7 @@ inputs:
   node-version:
     description: 'The node.js version to use'
     required: false
-    default: '20'
+    default: '22.14.0'
 runs:
   using: "composite"
   steps:

.github/actions/setup-xcode-build-cache/action.yml

@@ -4,15 +4,9 @@ inputs:
   hermes-version:
     description: The version of hermes
     required: true
-  jsengine:
-    dscription: The js engine in use
-    default: Hermes
   flavor:
     description: The flavor that is going to be built
     default: Debug
-  architecture:
-    description: The architecture that is going to be built
-    default: NewArch
   use-frameworks:
     description: Whether we are bulding with DynamicFrameworks or StaticLibraries
     default: StaticLibraries
@@ -30,9 +24,9 @@ runs:
       uses: actions/cache@v4
       with:
         path: packages/rn-tester/Podfile.lock
-        key: v13-podfilelock-${{ github.job }}-${{ inputs.architecture }}-${{ inputs.jsengine }}-${{ inputs.flavor }}-${{ inputs.use-frameworks }}-${{ inputs.ruby-version }}-${{ hashfiles('packages/rn-tester/Podfile') }}-${{ inputs.hermes-version }}
+        key: v13-podfilelock-${{ github.job }}-NewArch-${{ inputs.flavor }}-${{ inputs.use-frameworks }}-${{ inputs.ruby-version }}-${{ hashfiles('packages/rn-tester/Podfile') }}-${{ inputs.hermes-version }}
     - name: Cache cocoapods
       uses: actions/cache@v4
       with:
         path: packages/rn-tester/Pods
-        key: v15-cocoapods-${{ github.job }}-${{ inputs.architecture }}-${{ inputs.jsengine }}-${{ inputs.flavor }}-${{ inputs.use-frameworks }}-${{ inputs.ruby-version }}-${{ hashfiles('packages/rn-tester/Podfile.lock') }}-${{ hashfiles('packages/rn-tester/Podfile') }}-${{ inputs.hermes-version}}
+        key: v15-cocoapods-${{ github.job }}-NewArch-${{ inputs.flavor }}-${{ inputs.use-frameworks }}-${{ inputs.ruby-version }}-${{ hashfiles('packages/rn-tester/Podfile.lock') }}-${{ hashfiles('packages/rn-tester/Podfile') }}-${{ inputs.hermes-version}}

.github/actions/test-ios-helloworld/action.yml

@@ -1,15 +1,9 @@
 name: test-ios-helloworld
 description: Test iOS Hello World
 inputs:
-  jsengine:
-    description: Which JavaScript engine to use. Must be one of "Hermes", "JSC".
-    default: Hermes
   use-frameworks:
     description: The dependency building and linking strategy to use. Must be one of "StaticLibraries", "DynamicFrameworks"
     default: StaticLibraries
-  architecture:
-    description: The React Native architecture to Test. RNTester has always Fabric enabled, but we want to run integration test with the old arch setup. Must be one of "OldArch" or "NewArch"
-    default: OldArch
   ruby-version:
     description: The version of ruby that must be used
     default: 2.6.10
@@ -54,46 +48,53 @@ runs:
     - name: Print third-party folder
       shell: bash
       run: ls -lR /tmp/third-party
-    - name: Install iOS dependencies - Configuration ${{ inputs.flavor }}; New Architecture ${{ inputs.architecture }}; JS Engine ${{ inputs.jsengine }}
+    - name: Download React Native Prebuilds
+      uses: actions/download-artifact@v4
+      with:
+        name: ReactCore${{ inputs.flavor }}.xcframework.tar.gz
+        path: /tmp/ReactCore
+    - name: Print ReactCore folder
+      shell: bash
+      run: ls -lR /tmp/ReactCore
+    - name: Install iOS dependencies - Configuration ${{ inputs.flavor }};
       shell: bash
       run: |
-        cd packages/helloworld
+        cd private/helloworld
         args=()
 
-        if [[ ${{ inputs.architecture }} == "OldArch" ]]; then
-          args+=(--arch old)
-        fi
-
         if [[ ${{ inputs.use-frameworks }} == "DynamicFrameworks" ]]; then
           args+=(--frameworks dynamic)
         fi
 
-        if [[ ${{ inputs.jsengine }} == "JSC" ]]; then
-          args+=(--jsvm jsc)
-          yarn bootstrap ios "${args[@]}" | cat
-        else
-          # Tarball is restored with capital flavors suffix, but somehow the tarball name from JS at line 96 returns as lowercased.
-          # Let's ensure that the tarballs have the right names
+        # Tarball is restored with capital flavors suffix, but somehow the tarball name from JS at line 96 returns as lowercased.
+        # Let's ensure that the tarballs have the right names
 
-          if [[ -f "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Debug.tar.gz" ]]; then
-            mv "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Debug.tar.gz" "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-debug.tar.gz"
-          fi
-
-          if [[ -f "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Release.tar.gz" ]]; then
-            mv "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Release.tar.gz" "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-release.tar.gz"
-          fi
-
-          BUILD_TYPE="${{ inputs.flavor }}"
-          TARBALL_FILENAME=$(node ../react-native/scripts/hermes/get-tarball-name.js --buildType "$BUILD_TYPE")
-          export HERMES_ENGINE_TARBALL_PATH="$HERMES_WS_DIR/hermes-runtime-darwin/$TARBALL_FILENAME"
-          export RCT_USE_LOCAL_RN_DEP="/tmp/third-party/ReactNativeDependencies${{ inputs.flavor }}.xcframework.tar.gz"
-
-          yarn bootstrap ios "${args[@]}" | cat
+        if [[ -f "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Debug.tar.gz" ]]; then
+          mv "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Debug.tar.gz" "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-debug.tar.gz"
         fi
-    - name: Build HelloWorld  project
+
+        if [[ -f "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Release.tar.gz" ]]; then
+          mv "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-Release.tar.gz" "$HERMES_WS_DIR/hermes-runtime-darwin/hermes-ios-release.tar.gz"
+        fi
+
+        BUILD_TYPE="${{ inputs.flavor }}"
+        TARBALL_FILENAME=$(node ../../packages/react-native/scripts/hermes/get-tarball-name.js --buildType "$BUILD_TYPE")
+        export HERMES_ENGINE_TARBALL_PATH="$HERMES_WS_DIR/hermes-runtime-darwin/$TARBALL_FILENAME"
+        export RCT_USE_LOCAL_RN_DEP="/tmp/third-party/ReactNativeDependencies${{ inputs.flavor }}.xcframework.tar.gz"
+        export RCT_TESTONLY_RNCORE_TARBALL_PATH="/tmp/ReactCore/ReactCore${{ inputs.flavor }}.xcframework.tar.gz"
+
+        yarn bootstrap ios "${args[@]}" | cat
+
+    - name: Run Helloworld tests
       shell: bash
       run: |
-        cd packages/helloworld
+        cd private/helloworld
+        yarn test
+
+    - name: Build HelloWorld project
+      shell: bash
+      run: |
+        cd private/helloworld
 
         args=()
         if [[ ${{ inputs.flavor }} == "Release" ]]; then

.github/actions/test-ios-rntester/action.yml

@@ -1,15 +1,9 @@
 name: test-ios-rntester
 description: Test iOS RNTester
 inputs:
-  jsengine:
-    description: Which JavaScript engine to use. Must be one of "Hermes", "JSC".
-    default: Hermes
   use-frameworks:
     description: The dependency building and linking strategy to use. Must be one of "StaticLibraries", "DynamicFrameworks"
     default: StaticLibraries
-  architecture:
-    description: The React Native architecture to Test. RNTester has always Fabric enabled, but we want to run integration test with the old arch setup
-    default: NewArch
   ruby-version:
     description: The version of ruby that must be used
     default: 2.6.10
@@ -100,33 +94,32 @@ runs:
     - name: Print third-party folder
       shell: bash
       run: ls -lR /tmp/third-party
+    - name: Download React Native Prebuilds
+      uses: actions/download-artifact@v4
+      with:
+        name: ReactCore${{ inputs.flavor }}.xcframework.tar.gz
+        path: /tmp/ReactCore
+    - name: Print ReactCore folder
+      shell: bash
+      run: ls -lR /tmp/ReactCore
     - name: Setup xcode build cache
       uses: ./.github/actions/setup-xcode-build-cache
       with:
         hermes-version: ${{ inputs.hermes-version }}
-        jsengine: ${{ inputs.jsengine }}
-        architecture: ${{ inputs.architecture }}
         use-frameworks: ${{ inputs.use-frameworks }}
         flavor: ${{ inputs.flavor }}
         ruby-version: ${{ inputs.ruby-version }}
     - name: Install CocoaPods dependencies
       shell: bash
       run: |
-        if [[ ${{ inputs.jsengine }} == "JSC" ]]; then
-          export USE_HERMES=0
-        else
-          export HERMES_ENGINE_TARBALL_PATH=$HERMES_ENGINE_TARBALL_PATH
-        fi
+        export HERMES_ENGINE_TARBALL_PATH=$HERMES_ENGINE_TARBALL_PATH
+        export RCT_USE_LOCAL_RN_DEP="/tmp/third-party/ReactNativeDependencies${{ inputs.flavor }}.xcframework.tar.gz"
+        export RCT_TESTONLY_RNCORE_TARBALL_PATH="/tmp/ReactCore/ReactCore${{ inputs.flavor }}.xcframework.tar.gz"
 
         if [[ ${{ inputs.use-frameworks }} == "DynamicFrameworks" ]]; then
           export USE_FRAMEWORKS=dynamic
         fi
 
-        if [[ ${{ inputs.architecture }} == "OldArch" ]]; then
-          export RCT_NEW_ARCH_ENABLED=0
-        fi
-
-        export RCT_USE_LOCAL_RN_DEP="/tmp/third-party/ReactNativeDependencies${{ inputs.flavor }}.xcframework.tar.gz"
         cd packages/rn-tester
 
         bundle install
@@ -170,7 +163,7 @@ runs:
       if: ${{ inputs.use-frameworks == 'StaticLibraries' && inputs.ruby-version == '2.6.10' }} # This is needed to avoid conflicts with the artifacts
       uses: actions/upload-artifact@v4.3.4
       with:
-        name: RNTesterApp-${{ inputs.architecture }}-${{ inputs.jsengine }}-${{ inputs.flavor }}
+        name: RNTesterApp-NewArch-${{ inputs.flavor }}
         path: ${{ env.app-path }}
     - name: Store test results
       if: ${{ inputs.run-unit-tests == 'true' }}

.github/actions/test-js/action.yml

@@ -4,7 +4,7 @@ inputs:
   node-version:
     description: "The node.js version to use"
     required: false
-    default: "20"
+    default: "22"
 runs:
   using: composite
   steps:

.github/actions/yarn-install/action.yml

@@ -2,6 +2,8 @@ name: yarn-install
 runs:
   using: composite
   steps:
+    - name: Setup node.js
+      uses: ./.github/actions/setup-node
     - name: Install dependencies
       shell: bash
       run: |

.github/workflow-scripts/__tests__/verifyArtifactsAreOnMaven-test.js

@@ -38,7 +38,7 @@ describe('#verifyArtifactsAreOnMaven', () => {
 
     expect(mockSleep).toHaveBeenCalledTimes(1);
     expect(mockFetch).toHaveBeenCalledWith(
-      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1',
+      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1/react-native-artifacts-0.78.1.pom',
     );
   });
 
@@ -55,7 +55,7 @@ describe('#verifyArtifactsAreOnMaven', () => {
 
     expect(mockSleep).toHaveBeenCalledTimes(1);
     expect(mockFetch).toHaveBeenCalledWith(
-      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1',
+      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1/react-native-artifacts-0.78.1.pom',
     );
   });
 
@@ -67,7 +67,7 @@ describe('#verifyArtifactsAreOnMaven', () => {
 
     expect(mockSleep).toHaveBeenCalledTimes(0);
     expect(mockFetch).toHaveBeenCalledWith(
-      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1',
+      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1/react-native-artifacts-0.78.1.pom',
     );
   });
 
@@ -81,7 +81,7 @@ describe('#verifyArtifactsAreOnMaven', () => {
     expect(mockSleep).toHaveBeenCalledTimes(90);
     expect(mockExit).toHaveBeenCalledWith(1);
     expect(mockFetch).toHaveBeenCalledWith(
-      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1',
+      'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/0.78.1/react-native-artifacts-0.78.1.pom',
     );
   });
 });

.github/workflow-scripts/actOnLabel.js

@@ -95,12 +95,6 @@ module.exports = async (github, context, labelWithContext) => {
       );
       await requestAuthorFeedback();
       return;
-    case 'Newer Patch Available':
-      await addComment(
-        `> [!TIP]\n` +
-          `> **Newer version available**: You are on a supported minor version, but it looks like there's a newer patch available - ${labelWithContext.newestPatch}. Please [upgrade](https://reactnative.dev/docs/upgrading) to the highest patch for your minor or latest and verify if the issue persists (alternatively, create a new project and repro the issue in it). If it does not repro, please let us know so we can close out this issue. This helps us ensure we are looking at issues that still exist in the most recent releases.`,
-      );
-      return;
     case 'Needs: Version Info':
       await addComment(
         `> [!WARNING]\n` +

.github/workflow-scripts/analyze_code.sh

@@ -4,12 +4,16 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-GITHUB_OWNER=-facebook
-GITHUB_REPO=-react-native
-export GITHUB_OWNER
-export GITHUB_REPO
+export GITHUB_OWNER=-facebook
+export GITHUB_REPO=-react-native
 
-cat <(echo eslint; npm run lint --silent -- --format=json; echo flow; npm run flow-check --silent --json; echo google-java-format; node scripts/lint-java.js --diff) | node packages/react-native-bots/code-analysis-bot.js
+{
+  echo eslint
+  npm run lint --silent -- --format=json
+
+  echo flow
+  npm run flow-check --silent --json
+} | node private/react-native-bots/code-analysis-bot.js
 
 STATUS=$?
 if [ $STATUS == 0 ]; then
@@ -17,3 +21,4 @@ if [ $STATUS == 0 ]; then
 else
   echo "Code analysis failed, error status $STATUS."
 fi
+exit $STATUS

.github/workflow-scripts/verifyArtifactsAreOnMaven.js

@@ -13,13 +13,14 @@ const SLEEP_S = 60; // 1 minute
 const MAX_RETRIES = 90; // 90 attempts. Waiting between attempt: 1 min. Total time: 90 min.
 const ARTIFACT_URL =
   'https://repo1.maven.org/maven2/com/facebook/react/react-native-artifacts/';
+const ARTIFACT_NAME = 'react-native-artifacts-';
 
 async function verifyArtifactsAreOnMaven(version, retries = MAX_RETRIES) {
   if (version.startsWith('v')) {
     version = version.substring(1);
   }
 
-  const artifactUrl = `${ARTIFACT_URL}${version}`;
+  const artifactUrl = `${ARTIFACT_URL}${version}/${ARTIFACT_NAME}${version}.pom`;
   for (let currentAttempt = 1; currentAttempt <= retries; currentAttempt++) {
     const response = await fetch(artifactUrl);
 

.github/workflow-scripts/verifyVersion.js

@@ -45,18 +45,6 @@ module.exports = async (github, context) => {
   if (!isVersionSupported(issueVersion, latestVersion)) {
     return {label: 'Type: Unsupported Version'};
   }
-
-  // We want to encourage users to repro the issue on the highest available patch for the given minor.
-  const latestPatchForVersion = getLatestPatchForVersion(
-    issueVersion,
-    recentReleases,
-  );
-  if (latestPatchForVersion > issueVersion.patch) {
-    return {
-      label: 'Newer Patch Available',
-      newestPatch: `${issueVersion.major}.${issueVersion.minor}.${latestPatchForVersion}`,
-    };
-  }
 };
 
 /**
@@ -87,22 +75,6 @@ function isVersionTooOld(actualVersion, latestVersion) {
   );
 }
 
-// Assumes that releases are sorted in the order of recency (i.e. most recent releases are earlier in the list)
-// This enables us to stop looking as soon as we find the first release with a matching major/minor version, since
-// we know it's the most recent release, therefore the highest patch available.
-function getLatestPatchForVersion(version, releases) {
-  for (releaseName of releases) {
-    const release = parseVersionFromString(releaseName);
-    if (
-      release &&
-      release.major == version.major &&
-      release.minor == version.minor
-    ) {
-      return release.patch;
-    }
-  }
-}
-
 function getReactNativeVersionFromIssueBodyIfExists(issue) {
   if (!issue || !issue.body) return;
   const rnVersionRegex = /React Native Version[\r\n]+(?<version>.+)[\r\n]*/;

.github/workflows/bump-podfile-lock.yml

@@ -18,6 +18,10 @@ jobs:
         run: |
           git config --local user.email "bot@reactnative.dev"
           git config --local user.name "React Native Bot"
+      - name: Setup xcode
+        uses: ./.github/actions/setup-xcode
+        with:
+          xcode-version: '16.2.0'
       - name: Extract branch name
         run: |
           TAG="${{ github.ref_name }}";

.github/workflows/cache-reaper.yml

@@ -14,7 +14,7 @@ jobs:
       GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
       - uses: actions/checkout@v4
-      - name: Use Node.js 18
-        uses: actions/setup-node@v4
+      - name: Setup Node.js
+        uses: ./.github/actions/setup-node
       - name: Trim the cache
         run: node scripts/clean-gha-cache.js

.github/workflows/check-nightly.yml

@@ -1,6 +1,6 @@
 # This jobs runs every day 2 hours after the nightly job and its purpose is to report
 # a failure in case the nightly failed to be published. We are going to hook this to an internal automation.
-name: Check Nigthlies
+name: Check Nightlies
 
 on:
   workflow_dispatch:

.github/workflows/create-draft-release.yml

@@ -24,6 +24,6 @@ jobs:
         with:
           script: |
             const {createDraftRelease} = require('./.github/workflow-scripts/createDraftRelease.js');
-            const version = ${{ github.ref_name }}';
+            const version = '${{ github.ref_name }}';
             const {isLatest} = require('./.github/workflow-scripts/publishTemplate.js');
             await createDraftRelease(version, isLatest(), '${{secrets.REACT_NATIVE_BOT_GITHUB_TOKEN}}');

.github/workflows/danger-pr.yml

@@ -18,10 +18,14 @@ jobs:
     if: github.repository == 'facebook/react-native'
     steps:
       - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: ./.github/actions/setup-node
       - name: Run yarn install
         uses: ./.github/actions/yarn-install
+      - name: Run diff-js-api-breaking-changes
+        uses: ./.github/actions/diff-js-api-breaking-changes
       - name: Danger
         run: yarn danger ci --use-github-checks --failOnErrors
-        working-directory: packages/react-native-bots
+        working-directory: private/react-native-bots
         env:
           DANGER_GITHUB_API_TOKEN: ${{ secrets.REACT_NATIVE_BOT_GITHUB_TOKEN }}

.github/workflows/monitor-new-issues.yml

@@ -17,9 +17,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Set up Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '20'
+        uses: ./.github/actions/setup-node
       - name: Install dependencies
         uses:  ./.github/actions/yarn-install
       - name: Extract next oncall

.github/workflows/nightly.yml

@@ -101,9 +101,14 @@ jobs:
           flavor: ${{ matrix.flavor }}
 
   prebuild_apple_dependencies:
-    uses: ./.github/workflows/prebuild-ios.yml
+    uses: ./.github/workflows/prebuild-ios-dependencies.yml
     secrets: inherit
 
+  prebuild_react_native_core:
+    uses: ./.github/workflows/prebuild-ios-core.yml
+    secrets: inherit
+    needs: [prebuild_apple_dependencies, build_hermes_macos]
+
   build_hermesc_linux:
     runs-on: ubuntu-latest
     needs: prepare_hermes_workspace
@@ -120,12 +125,12 @@ jobs:
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
 
   build_hermesc_windows:
-    runs-on: windows-2019
+    runs-on: windows-2025
     needs: prepare_hermes_workspace
     env:
-      HERMES_WS_DIR: 'D:\tmp\hermes'
-      HERMES_TARBALL_ARTIFACTS_DIR: 'D:\tmp\hermes\hermes-runtime-darwin'
-      HERMES_OSXBIN_ARTIFACTS_DIR: 'D:\tmp\hermes\osx-bin'
+      HERMES_WS_DIR: 'C:\tmp\hermes'
+      HERMES_TARBALL_ARTIFACTS_DIR: 'C:\tmp\hermes\hermes-runtime-darwin'
+      HERMES_OSXBIN_ARTIFACTS_DIR: 'C:\tmp\hermes\osx-bin'
       ICU_URL: "https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-Win64-MSVC2017.zip"
       MSBUILD_DIR: 'C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin'
       CMAKE_DIR: 'C:\Program Files\CMake\bin'
@@ -170,6 +175,7 @@ jobs:
         build_hermesc_windows,
         build_android,
         prebuild_apple_dependencies,
+        prebuild_react_native_core,
       ]
     container:
       image: reactnativecommunity/react-native-android:latest

.github/workflows/prebuild-ios-core.yml

@@ -0,0 +1,212 @@
+name: Prebuild iOS Dependencies
+
+on:
+  workflow_call: # this directive allow us to call this workflow from other workflows
+
+
+jobs:
+  build-rn-slice:
+    runs-on: macos-14
+    strategy:
+      fail-fast: false
+      matrix:
+        flavor: ['Debug', 'Release']
+        slice: [
+          'ios',
+          'ios-simulator',
+          'mac-catalyst',
+        ]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Restore cache if present
+        id: restore-ios-slice
+        uses: actions/cache/restore@v4
+        with:
+          key: v3-ios-core-${{ matrix.slice }}-${{ matrix.flavor }}-${{ hashFiles('packages/react-native/Package.swift', 'packages/react-native/scripts/ios-prebuild/setup.js', 'packages/react-native/React/**/*', 'packages/react-native/ReactCommon/**/*', 'packages/react-native/Libraries/**/*') }}
+          path: packages/react-native/
+      - name: Setup node.js
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        uses: ./.github/actions/setup-node
+      - name: Setup xcode
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        uses: ./.github/actions/setup-xcode
+        with:
+          xcode-version: '16.2.0'
+      - name: Yarn Install
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        uses: ./.github/actions/yarn-install
+      - name: Download Hermes
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        uses: actions/download-artifact@v4
+        with:
+          name: hermes-darwin-bin-${{ matrix.flavor }}
+          path: /tmp/hermes/hermes-runtime-darwin
+      - name: Extract Hermes
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          HERMES_TARBALL_ARTIFACTS_DIR=/tmp/hermes/hermes-runtime-darwin
+          if [ ! -d $HERMES_TARBALL_ARTIFACTS_DIR ]; then
+            echo "Hermes tarball artifacts dir not present ($HERMES_TARBALL_ARTIFACTS_DIR)."
+            exit 0
+          fi
+
+          TARBALL_FILENAME=$(node ./packages/react-native/scripts/hermes/get-tarball-name.js --buildType "${{ matrix.flavor }}")
+          TARBALL_PATH=$HERMES_TARBALL_ARTIFACTS_DIR/$TARBALL_FILENAME
+
+          echo "Looking for $TARBALL_FILENAME in $HERMES_TARBALL_ARTIFACTS_DIR"
+          echo "$TARBALL_PATH"
+
+          if [ ! -f $TARBALL_PATH ]; then
+            echo "Hermes tarball not present ($TARBALL_PATH). Build Hermes from source."
+            exit 0
+          fi
+
+          echo "Found Hermes tarball at $TARBALL_PATH"
+          echo "HERMES_ENGINE_TARBALL_PATH=$TARBALL_PATH" >> $GITHUB_ENV
+      - name: Download ReactNativeDependencies
+        uses: actions/download-artifact@v4
+        with:
+          name: ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz
+          path: /tmp/third-party/
+      - name: Extract ReactNativeDependencies
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          # Extract ReactNativeDependencies
+          tar -xzf /tmp/third-party/ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz -C /tmp/third-party/
+
+          # Create destination folder
+          mkdir -p packages/react-native/third-party/
+
+          # Move the XCFramework in the destination directory
+          mv /tmp/third-party/packages/react-native/third-party/ReactNativeDependencies.xcframework packages/react-native/third-party/ReactNativeDependencies.xcframework
+
+          VERSION=$(jq -r '.version' packages/react-native/package.json)
+          echo "$VERSION-${{matrix.flavor}}" > "packages/react-native/third-party/version.txt"
+          cat "packages/react-native/third-party/version.txt"
+          # Check destination directory
+          ls -lR packages/react-native/third-party/
+      - name: Setup the workspace
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          cd packages/react-native
+          node scripts/ios-prebuild.js -s -f "${{ matrix.flavor }}"
+      - name: Build React Native
+        if: steps.restore-ios-slice.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          # This is going to be replaced by a CLI script
+          cd packages/react-native
+          node scripts/ios-prebuild -b -f "${{ matrix.flavor }}" -p "${{ matrix.slice }}"
+      - name: Upload headers
+        uses: actions/upload-artifact@v4
+        with:
+          name: prebuild-ios-core-headers-${{ matrix.flavor }}-${{ matrix.slice }}
+          path:
+            packages/react-native/.build/headers
+      - name: Upload artifacts
+        uses: actions/upload-artifact@v4.3.4
+        with:
+          name: prebuild-ios-core-slice-${{ matrix.flavor }}-${{ matrix.slice }}
+          path: |
+            packages/react-native/.build/output/spm/${{ matrix.flavor }}/Build/Products
+      - name: Save Cache
+        uses: actions/cache/save@v4
+        if: ${{ github.ref == 'refs/heads/main' }} # To avoid that the cache explode
+        with:
+          key: v3-ios-core-${{ matrix.slice }}-${{ matrix.flavor }}-${{ hashFiles('packages/react-native/Package.swift', 'packages/react-native/scripts/ios-prebuild/setup.js', 'packages/react-native/React/**/*', 'packages/react-native/ReactCommon/**/*', 'packages/react-native/Libraries/**/*') }}
+          path: |
+            packages/react-native/.build/output/spm/${{ matrix.flavor }}/Build/Products
+            packages/react-native/.build/headers
+
+  compose-xcframework:
+    runs-on: macos-14
+    needs: [build-rn-slice]
+    strategy:
+      fail-fast: false
+      matrix:
+        flavor: ['Debug', 'Release']
+    env:
+      REACT_ORG_CODE_SIGNING_P12_CERT: ${{ secrets.REACT_ORG_CODE_SIGNING_P12_CERT }}
+      REACT_ORG_CODE_SIGNING_P12_CERT_PWD: ${{ secrets.REACT_ORG_CODE_SIGNING_P12_CERT_PWD }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Restore cache if present
+        id: restore-ios-xcframework
+        uses: actions/cache/restore@v4
+        with:
+          path: packages/react-native/.build/output/xcframeworks
+          key: v2-ios-core-xcframework-${{ matrix.flavor }}-${{ hashFiles('packages/react-native/Package.swift', 'packages/react-native/scripts/ios-prebuild/setup.js', 'packages/react-native/React/**/*', 'packages/react-native/ReactCommon/**/*', 'packages/react-native/Libraries/**/*') }}
+      - name: Setup node.js
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: ./.github/actions/setup-node
+      - name: Setup xcode
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: ./.github/actions/setup-xcode
+        with:
+          xcode-version: '16.2.0'
+      - name: Yarn Install
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: ./.github/actions/yarn-install
+      - name: Download slice artifacts
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: actions/download-artifact@v4
+        with:
+          pattern: prebuild-ios-core-slice-${{ matrix.flavor }}-*
+          path: packages/react-native/.build/output/spm/${{ matrix.flavor }}/Build/Products
+          merge-multiple: true
+      - name: Download headers
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: actions/download-artifact@v4
+        with:
+          pattern: prebuild-ios-core-headers-${{ matrix.flavor }}-*
+          path: packages/react-native/.build/headers
+          merge-multiple: true
+      - name: Setup Keychain
+        if: ${{ steps.restore-ios-xcframework.outputs.cache-hit != 'true' && env.REACT_ORG_CODE_SIGNING_P12_CERT != '' }}
+        uses: apple-actions/import-codesign-certs@v3 # https://github.com/marketplace/actions/import-code-signing-certificates
+        with:
+          p12-file-base64: ${{ secrets.REACT_ORG_CODE_SIGNING_P12_CERT }}
+          p12-password: ${{ secrets.REACT_ORG_CODE_SIGNING_P12_CERT_PWD }}
+      - name: Create XCFramework
+        if: ${{ steps.restore-ios-xcframework.outputs.cache-hit != 'true' && env.REACT_ORG_CODE_SIGNING_P12_CERT == '' }}
+        run: |
+          cd packages/react-native
+          node scripts/ios-prebuild -c -f "${{ matrix.flavor }}"
+      - name: Create and Sign XCFramework
+        if: ${{ steps.restore-ios-xcframework.outputs.cache-hit != 'true' && env.REACT_ORG_CODE_SIGNING_P12_CERT != '' }}
+        run: |
+          cd packages/react-native
+          node scripts/ios-prebuild -c -f "${{ matrix.flavor }}" -i "React Org"
+      - name: Compress and Rename XCFramework
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        run: |
+          cd packages/react-native/.build/output/xcframeworks/${{matrix.flavor}}
+          tar -cz -f ../ReactCore${{matrix.flavor}}.xcframework.tar.gz React.xcframework
+      - name: Compress and Rename dSYM
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        run: |
+          cd packages/react-native/.build/output/xcframeworks/${{matrix.flavor}}/Symbols
+          tar -cz -f ../../ReactCore${{ matrix.flavor }}.framework.dSYM.tar.gz .
+      - name: Upload XCFramework Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ReactCore${{ matrix.flavor }}.xcframework.tar.gz
+          path: packages/react-native/.build/output/xcframeworks/ReactCore${{matrix.flavor}}.xcframework.tar.gz
+      - name: Upload dSYM Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ReactCore${{ matrix.flavor }}.framework.dSYM.tar.gz
+          path: packages/react-native/.build/output/xcframeworks/ReactCore${{matrix.flavor}}.framework.dSYM.tar.gz
+      - name: Save cache if present
+        if: ${{ github.ref == 'refs/heads/main' }} # To avoid that the cache explode
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            packages/react-native/.build/output/xcframeworks/ReactCore${{matrix.flavor}}.xcframework.tar.gz
+            packages/react-native/.build/output/xcframeworks/ReactCore${{matrix.flavor}}.framework.dSYM.tar.gz
+          key: v2-ios-core-xcframework-${{ matrix.flavor }}-${{ hashFiles('packages/react-native/Package.swift', 'packages/react-native/scripts/ios-prebuild/setup.js', 'packages/react-native/React/**/*', 'packages/react-native/ReactCommon/**/*', 'packages/react-native/Libraries/**/*') }}

.github/workflows/prebuild-ios-dependencies.yml

@@ -1,4 +1,4 @@
-name: Prebuild iOS
+name: Prebuild iOS Dependencies
 
 on:
   workflow_call: # this directive allow us to call this workflow from other workflows

.github/workflows/publish-bumped-packages.yml

@@ -21,7 +21,7 @@ jobs:
       - name: Build packages
         run: yarn build
       - name: Build types
-        run: yarn build-types
+        run: yarn build-types --skip-snapshot
       - name: Set NPM auth token
         run: echo "//registry.npmjs.org/:_authToken=$GHA_NPM_TOKEN" > ~/.npmrc
       - name: Find and publish all bumped packages

.github/workflows/publish-release.yml

@@ -96,10 +96,16 @@ jobs:
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
           flavor: ${{ matrix.flavor }}
+
   prebuild_apple_dependencies:
-    uses: ./.github/workflows/prebuild-ios.yml
+    uses: ./.github/workflows/prebuild-ios-dependencies.yml
     secrets: inherit
 
+  prebuild_react_native_core:
+    uses: ./.github/workflows/prebuild-ios-core.yml
+    secrets: inherit
+    needs: [prebuild_apple_dependencies, build_hermes_macos]
+
   build_hermesc_linux:
     runs-on: ubuntu-latest
     needs: prepare_hermes_workspace
@@ -116,12 +122,12 @@ jobs:
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
 
   build_hermesc_windows:
-    runs-on: windows-2019
+    runs-on: windows-2025
     needs: prepare_hermes_workspace
     env:
-      HERMES_WS_DIR: 'D:\tmp\hermes'
-      HERMES_TARBALL_ARTIFACTS_DIR: 'D:\tmp\hermes\hermes-runtime-darwin'
-      HERMES_OSXBIN_ARTIFACTS_DIR: 'D:\tmp\hermes\osx-bin'
+      HERMES_WS_DIR: 'C:\tmp\hermes'
+      HERMES_TARBALL_ARTIFACTS_DIR: 'C:\tmp\hermes\hermes-runtime-darwin'
+      HERMES_OSXBIN_ARTIFACTS_DIR: 'C:\tmp\hermes\osx-bin'
       ICU_URL: "https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-Win64-MSVC2017.zip"
       MSBUILD_DIR: 'C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin'
       CMAKE_DIR: 'C:\Program Files\CMake\bin'
@@ -134,27 +140,6 @@ jobs:
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
 
-  build_android:
-    runs-on: 8-core-ubuntu
-    needs: [set_release_type]
-    container:
-      image: reactnativecommunity/react-native-android:latest
-      env:
-        TERM: "dumb"
-        GRADLE_OPTS: "-Dorg.gradle.daemon=false"
-        ORG_GRADLE_PROJECT_SIGNING_PWD: ${{ secrets.ORG_GRADLE_PROJECT_SIGNING_PWD }}
-        ORG_GRADLE_PROJECT_SIGNING_KEY: ${{ secrets.ORG_GRADLE_PROJECT_SIGNING_KEY }}
-        ORG_GRADLE_PROJECT_SONATYPE_USERNAME: ${{ secrets.ORG_GRADLE_PROJECT_SONATYPE_USERNAME }}
-        ORG_GRADLE_PROJECT_SONATYPE_PASSWORD: ${{ secrets.ORG_GRADLE_PROJECT_SONATYPE_PASSWORD }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Build Android
-        uses: ./.github/actions/build-android
-        with:
-          release-type: ${{ needs.set_release_type.outputs.RELEASE_TYPE }}
-          gradle-cache-encryption-key: ${{ secrets.GRADLE_CACHE_ENCRYPTION_KEY }}
-
   build_npm_package:
     runs-on: 8-core-ubuntu
     needs:
@@ -164,8 +149,8 @@ jobs:
         build_hermes_macos,
         build_hermesc_linux,
         build_hermesc_windows,
-        build_android,
         prebuild_apple_dependencies,
+        prebuild_react_native_core,
       ]
     container:
       image: reactnativecommunity/react-native-android:latest

.github/workflows/retry-workflow.yml

@@ -0,0 +1,19 @@
+name: Retry workflow
+# Based on https://stackoverflow.com/a/78314483
+
+on:
+    workflow_dispatch:
+        inputs:
+            run_id:
+                required: true
+jobs:
+    rerun:
+        runs-on: ubuntu-latest
+        steps:
+            - name: rerun ${{ inputs.run_id }}
+              env:
+                  GH_REPO: ${{ github.repository }}
+                  GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+              run: |
+                  gh run watch ${{ inputs.run_id }} > /dev/null 2>&1
+                  gh run rerun ${{ inputs.run_id }} --failed

.github/workflows/stale-bot.yml

@@ -14,8 +14,8 @@ jobs:
         with:
           repo-token: ${{ secrets.REACT_NATIVE_BOT_GITHUB_TOKEN }}
           days-before-stale: 180
-          stale-issue-message: 'This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.'
-          stale-pr-message: 'This PR is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.'
+          stale-issue-message: 'This issue is stale because it has been open for 180 days with no activity. It will be closed in 7 days unless you comment on it or remove the "Stale" label.'
+          stale-pr-message: 'This PR is stale because it has been open for 180 days with no activity. It will be closed in 7 days unless you comment on it or remove the "Stale" label.'
           close-issue-message: 'This issue was closed because it has been stalled for 7 days with no activity.'
           close-pr-message: 'This PR was closed because it has been stalled for 7 days with no activity.'
           exempt-issue-labels: 'Help Wanted :octocat:, Good first issue, Never gets stale, Issue: Author Provided Repro'

.github/workflows/test-all.yml

@@ -117,13 +117,18 @@ jobs:
           flavor: ${{ matrix.flavor }}
 
   prebuild_apple_dependencies:
-    uses: ./.github/workflows/prebuild-ios.yml
+    uses: ./.github/workflows/prebuild-ios-dependencies.yml
     secrets: inherit
 
+  prebuild_react_native_core:
+    uses: ./.github/workflows/prebuild-ios-core.yml
+    secrets: inherit
+    needs: [prebuild_apple_dependencies, build_hermes_macos]
+
   test_ios_rntester_ruby_3_2_0:
     runs-on: macos-14
     needs:
-      [build_apple_slices_hermes, prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies]
+      [build_apple_slices_hermes, prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies, prebuild_react_native_core]
     env:
       HERMES_WS_DIR: /tmp/hermes
       HERMES_TARBALL_ARTIFACTS_DIR: /tmp/hermes/hermes-runtime-darwin
@@ -136,34 +141,12 @@ jobs:
           ruby-version: "3.2.0"
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
-
-  test_ios_rntester_dynamic_frameworks:
-    runs-on: macos-14
-    needs:
-      [build_apple_slices_hermes, prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies]
-    env:
-      HERMES_WS_DIR: /tmp/hermes
-      HERMES_TARBALL_ARTIFACTS_DIR: /tmp/hermes/hermes-runtime-darwin
-    continue-on-error: true
-    strategy:
-      fail-fast: false
-      matrix:
-        jsengine: [Hermes, JSC]
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-      - name: Run it
-        uses: ./.github/actions/test-ios-rntester
-        with:
-          jsengine: ${{ matrix.jsengine }}
-          use-frameworks: DynamicFrameworks
-          hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
-          react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
+          flavor: Debug
 
   test_ios_rntester:
     runs-on: macos-14-large
     needs:
-      [build_apple_slices_hermes, prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies]
+      [build_apple_slices_hermes, prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies, prebuild_react_native_core]
     env:
       HERMES_WS_DIR: /tmp/hermes
       HERMES_TARBALL_ARTIFACTS_DIR: /tmp/hermes/hermes-runtime-darwin
@@ -171,26 +154,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jsengine: [Hermes, JSC]
-        architecture: [NewArch, OldArch]
         flavor: [Debug, Release]
-        exclude: # We don't want to test the Old Arch in Release for E2E
-          - jsengine: Hermes
-            architecture: OldArch
-            flavor: Release
-          - jsengine: JSC
-            architecture: OldArch
-            flavor: Release
+        frameworks: [StaticLibraries, DynamicFrameworks]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Run it
         uses: ./.github/actions/test-ios-rntester
         with:
-          jsengine: ${{ matrix.jsengine }}
-          architecture: ${{ matrix.architecture }}
-          run-unit-tests: "false"
-          use-frameworks: StaticLibraries
+          use-frameworks: ${{ matrix.frameworks }}
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
           flavor: ${{ matrix.flavor }}
@@ -203,20 +175,19 @@ jobs:
     env:
       HERMES_WS_DIR: /tmp/hermes
       HERMES_TARBALL_ARTIFACTS_DIR: /tmp/hermes/hermes-runtime-darwin
-    continue-on-error: true
     strategy:
       fail-fast: false
       matrix:
-        jsengine: [Hermes, JSC]
-        architecture: [NewArch]
         flavor: [Debug, Release]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: ./.github/actions/setup-node
       - name: Download App
         uses: actions/download-artifact@v4
         with:
-          name: RNTesterApp-${{ matrix.architecture }}-${{ matrix.jsengine }}-${{ matrix.flavor }}
+          name: RNTesterApp-NewArch-${{ matrix.flavor }}
           path: /tmp/RNTesterBuild/RNTester.app
       - name: Check downloaded folder content
         run: ls -lR /tmp/RNTesterBuild
@@ -227,7 +198,6 @@ jobs:
         with:
           app-path: "/tmp/RNTesterBuild/RNTester.app"
           app-id: com.meta.RNTester.localDevelopment
-          jsengine: ${{ matrix.jsengine }}
           maestro-flow: ./packages/rn-tester/.maestro/
           flavor: ${{ matrix.flavor }}
 
@@ -238,13 +208,10 @@ jobs:
     env:
       HERMES_WS_DIR: /tmp/hermes
       HERMES_TARBALL_ARTIFACTS_DIR: /tmp/hermes/hermes-runtime-darwin
-    continue-on-error: true
     strategy:
       fail-fast: false
       matrix:
-        jsengine: [Hermes, JSC]
         flavor: [Debug, Release]
-        architecture: [OldArch, NewArch]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -278,6 +245,14 @@ jobs:
       - name: Print third-party folder
         shell: bash
         run: ls -lR /tmp/third-party
+      - name: Download React Native Prebuilds
+        uses: actions/download-artifact@v4
+        with:
+          name: ReactCore${{ matrix.flavor }}.xcframework.tar.gz
+          path: /tmp/ReactCore
+      - name: Print ReactCore folder
+        shell: bash
+        run: ls -lR /tmp/ReactCore
       - name: Prepare artifacts
         run: |
           REACT_NATIVE_PKG=$(find /tmp/react-native-tmp -type f -name "*.tgz")
@@ -298,12 +273,9 @@ jobs:
           cd /tmp/RNTestProject/ios
           bundle install
           NEW_ARCH_ENABLED=1
-          if [[ ${{ matrix.architecture }} == "OldArch" ]]; then
-            echo "Disable the New Architecture"
-            NEW_ARCH_ENABLED=0
-          fi
 
           export RCT_USE_LOCAL_RN_DEP=/tmp/third-party/ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz
+          export RCT_TESTONLY_RNCORE_TARBALL_PATH="/tmp/ReactCore/ReactCore${{ matrix.flavor }}.xcframework.tar.gz"
           HERMES_ENGINE_TARBALL_PATH=$HERMES_PATH RCT_NEW_ARCH_ENABLED=$NEW_ARCH_ENABLED bundle exec pod install
 
           xcodebuild \
@@ -318,23 +290,18 @@ jobs:
         with:
           app-path: "/tmp/RNTestProject/Build/Products/${{ matrix.flavor }}-iphonesimulator/RNTestProject.app"
           app-id: org.reactjs.native.example.RNTestProject
-          jsengine: ${{ matrix.jsengine }}
           maestro-flow: ./scripts/e2e/.maestro/
           flavor: ${{ matrix.flavor }}
           working-directory: /tmp/RNTestProject
-          architecture: ${{ matrix.architecture }}
 
   test_e2e_android_templateapp:
     if: ${{ github.ref == 'refs/heads/main' || contains(github.ref,  'stable') || inputs.run-e2e-tests }}
     runs-on: 4-core-ubuntu
     needs: build_npm_package
-    continue-on-error: true
     strategy:
       fail-fast: false
       matrix:
-        jsengine: [Hermes, JSC]
         flavor: [debug, release]
-        architecture: [OldArch, NewArch]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -380,16 +347,6 @@ jobs:
           cd /tmp/RNTestProject
           echo "react.internal.mavenLocalRepo=$MAVEN_LOCAL" >> android/gradle.properties
 
-          if [[ ${{matrix.architecture}} == "OldArch" ]]; then
-            echo "Disabling the New Architecture"
-            sed -i 's/newArchEnabled=true/newArchEnabled=false/' android/gradle.properties
-          fi
-
-          if [[ ${{matrix.jsengine}} == "JSC" ]]; then
-            echo "Using JSC instead of Hermes"
-            sed -i 's/hermesEnabled=true/hermesEnabled=false/' android/gradle.properties
-          fi
-
           # Build
           cd android
           CAPITALIZED_FLAVOR=$(echo "${{ matrix.flavor }}" | awk '{print toupper(substr($0, 1, 1)) substr($0, 2)}')
@@ -401,12 +358,10 @@ jobs:
         with:
           app-path: /tmp/RNTestProject/android/app/build/outputs/apk/${{ matrix.flavor }}/app-${{ matrix.flavor }}.apk
           app-id: com.rntestproject
-          jsengine: ${{ matrix.jsengine }}
           maestro-flow: ./scripts/e2e/.maestro/
           install-java: 'false'
           flavor: ${{ matrix.flavor }}
           working-directory: /tmp/RNTestProject
-          architecture: ${{ matrix.architecture }}
 
   build_hermesc_linux:
     runs-on: ubuntu-latest
@@ -424,12 +379,12 @@ jobs:
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
 
   build_hermesc_windows:
-    runs-on: windows-2019
+    runs-on: windows-2025
     needs: prepare_hermes_workspace
     env:
-      HERMES_WS_DIR: 'D:\tmp\hermes'
-      HERMES_TARBALL_ARTIFACTS_DIR: 'D:\tmp\hermes\hermes-runtime-darwin'
-      HERMES_OSXBIN_ARTIFACTS_DIR: 'D:\tmp\hermes\osx-bin'
+      HERMES_WS_DIR: 'C:\tmp\hermes'
+      HERMES_TARBALL_ARTIFACTS_DIR: 'C:\tmp\hermes\hermes-runtime-darwin'
+      HERMES_OSXBIN_ARTIFACTS_DIR: 'C:\tmp\hermes\osx-bin'
       ICU_URL: "https://github.com/unicode-org/icu/releases/download/release-64-2/icu4c-64_2-Win64-MSVC2017.zip"
       MSBUILD_DIR: 'C:\Program Files (x86)\Microsoft Visual Studio\2019\BuildTools\MSBuild\Current\Bin'
       CMAKE_DIR: 'C:\Program Files\CMake\bin'
@@ -469,7 +424,6 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        jsengine: [hermes, jsc]
         flavor: [debug, release]
     steps:
       - name: Checkout
@@ -481,17 +435,16 @@ jobs:
       - name: Download APK
         uses: actions/download-artifact@v4
         with:
-          name: rntester-${{ matrix.jsengine }}-${{ matrix.flavor }}
-          path: ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.jsengine }}/${{ matrix.flavor }}/
+          name: rntester-${{ matrix.flavor }}
+          path: ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.flavor }}/
       - name: Print folder structure
-        run: ls -lR ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.jsengine }}/${{ matrix.flavor }}/
+        run: ls -lR ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.flavor }}/
       - name: Run E2E Tests
         uses: ./.github/actions/maestro-android
         timeout-minutes: 60
         with:
-          app-path: ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.jsengine }}/${{ matrix.flavor }}/app-${{ matrix.jsengine }}-x86-${{ matrix.flavor }}.apk
+          app-path: ./packages/rn-tester/android/app/build/outputs/apk/${{ matrix.flavor }}/app-x86-${{ matrix.flavor }}.apk
           app-id: com.facebook.react.uiapp
-          jsengine: ${{ matrix.jsengine }}
           maestro-flow: ./packages/rn-tester/.maestro
           flavor: ${{ matrix.flavor }}
 
@@ -506,6 +459,7 @@ jobs:
         build_hermesc_windows,
         build_android,
         prebuild_apple_dependencies,
+        prebuild_react_native_core,
       ]
     container:
       image: reactnativecommunity/react-native-android:latest
@@ -542,8 +496,6 @@ jobs:
       fail-fast: false
       matrix:
         flavor: [Debug, Release]
-        architecture: [NewArch, OldArch]
-        jsengine: [Hermes, JSC]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -568,17 +520,11 @@ jobs:
       - name: Prepare the Helloworld application
         shell: bash
         run: node ./scripts/e2e/init-project-e2e.js --useHelloWorld --pathToLocalReactNative "$GITHUB_WORKSPACE/build/$(cat build/react-native-package-version)"
-      - name: Build the Helloworld application for ${{ matrix.flavor }} with Architecture set to ${{ matrix.architecture }}, and using the ${{ matrix.jsengine }} JS engine.
+      - name: Build the Helloworld application for ${{ matrix.flavor }} with Architecture set to New Architecture.
         shell: bash
         run: |
-          cd packages/helloworld/android
+          cd private/helloworld/android
           args=()
-          if [[ ${{ matrix.architecture }} == "OldArch" ]]; then
-            args+=(--arch old)
-          fi
-          if [[ ${{ matrix.jsengine }} == "JSC" ]]; then
-            args+=(--jsvm jsc)
-          fi
           if [[ ${{ matrix.flavor }} == "Release" ]]; then
             args+=(--prod)
           fi
@@ -586,13 +532,13 @@ jobs:
       - name: Upload artifact
         uses: actions/upload-artifact@v4.3.4
         with:
-          name: helloworld-apk-${{ matrix.flavor }}-${{ matrix.architecture }}-${{ matrix.jsengine }}
-          path: ./packages/helloworld/android/app/build/outputs/apk/
+          name: helloworld-apk-${{ matrix.flavor }}-NewArch-hermes
+          path: ./private/helloworld/android/app/build/outputs/apk/
           compression-level: 0
 
   test_ios_helloworld_with_ruby_3_2_0:
     runs-on: macos-14
-    needs: [prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies] # prepare_hermes_workspace must be there because we need its reference to retrieve a couple of outputs
+    needs: [prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies, prebuild_react_native_core] # prepare_hermes_workspace must be there because we need its reference to retrieve a couple of outputs
     env:
       PROJECT_NAME: iOSTemplateProject
       HERMES_WS_DIR: /tmp/hermes
@@ -603,23 +549,20 @@ jobs:
       - uses: ./.github/actions/test-ios-helloworld
         with:
           ruby-version: 3.2.0
-          architecture: NewArch
           flavor: Debug
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
 
   test_ios_helloworld:
     runs-on: macos-14
-    needs: [prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies] # prepare_hermes_workspace must be there because we need its reference to retrieve a couple of outputs
+    needs: [prepare_hermes_workspace, build_hermes_macos, prebuild_apple_dependencies, prebuild_react_native_core] # prepare_hermes_workspace must be there because we need its reference to retrieve a couple of outputs
     strategy:
       matrix:
         flavor: [Debug, Release]
-        jsengine: [Hermes, JSC]
         use_frameworks: [StaticLibraries, DynamicFrameworks]
         exclude:
           # This config is tested with Ruby 3.2.0. Let's not double test it.
           - flavor: Debug
-            jsengine: Hermes
             use_frameworks: StaticLibraries
     env:
       PROJECT_NAME: iOSTemplateProject
@@ -631,7 +574,6 @@ jobs:
       - uses: ./.github/actions/test-ios-helloworld
         with:
           flavor: ${{ matrix.flavor }}
-          jsengine: ${{ matrix.jsengine }}
           use-frameworks: ${{ matrix.use_frameworks }}
           hermes-version: ${{ needs.prepare_hermes_workspace.outputs.hermes-version }}
           react-native-version: ${{ needs.prepare_hermes_workspace.outputs.react-native-version }}
@@ -641,7 +583,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: ["22", "20", "18"]
+        node-version: ["24", "22", "20"]
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -657,7 +599,47 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
-      - name: Run all the Linters
+      - name: Run all the linters
         uses: ./.github/actions/lint
         with:
           github-token: ${{ env.GH_TOKEN }}
+
+  # This job should help with the E2E flakyness.
+  # In case E2E tests fails, it launches a new retry-workflow workflow, passing the current run_id as input.
+  # The retry-workflow reruns only the failed jobs of the current test-all workflow using
+  # ```
+  # gh run rerun ${{ inputs.run_id }} --failed
+  # ```
+  # From https://stackoverflow.com/a/78314483 it seems like that adding the extra workflow
+  # rather then calling directly this command should improve stability of this solution.
+  # This is exactly the same as rerunning failed tests from the GH UI, but automated.
+  rerun-failed-jobs:
+    runs-on: ubuntu-latest
+    needs: [test_e2e_ios_rntester, test_e2e_android_rntester, test_e2e_ios_templateapp, test_e2e_android_templateapp]
+    if: always()
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Rerun failed jobs in the current workflow
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          SHOULD_RETRY=${{fromJSON(github.run_attempt) < 3}}
+          if [[ $SHOULD_RETRY == "false" ]]; then
+            exit 0
+          fi
+
+          RNTESTER_ANDROID_FAILED=${{ needs.test_e2e_android_rntester.result == 'failure' }}
+          TEMPLATE_ANDROID_FAILED=${{ needs.test_e2e_android_templateapp.result == 'failure' }}
+          RNTESTER_IOS_FAILED=${{ needs.test_e2e_ios_rntester.result == 'failure' }}
+          TEMPLATE_IOS_FAILED=${{ needs.test_e2e_ios_templateapp.result == 'failure' }}
+
+          echo "RNTESTER_ANDROID_FAILED: $RNTESTER_ANDROID_FAILED"
+          echo "TEMPLATE_ANDROID_FAILED: $TEMPLATE_ANDROID_FAILED"
+          echo "RNTESTER_IOS_FAILED: $RNTESTER_IOS_FAILED"
+          echo "TEMPLATE_IOS_FAILED: $TEMPLATE_IOS_FAILED"
+
+          if [[ $RNTESTER_ANDROID_FAILED == "true" || $TEMPLATE_ANDROID_FAILED == "true" || $RNTESTER_IOS_FAILED == "true" || $TEMPLATE_IOS_FAILED == "true" ]]; then
+            echo "Rerunning failed jobs in the current workflow"
+            gh workflow run retry-workflow.yml -F run_id=${{ github.run_id }}
+          fi

.github/workflows/test-libraries-on-nightlies.yml

@@ -48,7 +48,6 @@ jobs:
           "react-native-contacts",
           "react-native-device-info",
           "react-native-email-link",
-          "react-native-exit-app",
           "@dr.pogodin/react-native-fs",
           "react-native-permissions",
           "react-native-vector-icons",
@@ -59,6 +58,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: ./.github/actions/setup-node
       - name: Test ${{ matrix.library }}
         id: run-test
         uses: ./.github/actions/test-library-on-nightly

.gitignore

@@ -30,6 +30,7 @@ project.xcworkspace
 /packages/rn-tester/android/app/gradle/
 /packages/rn-tester/android/app/gradlew
 /packages/rn-tester/android/app/gradlew.bat
+/packages/react-native/build/
 /packages/react-native/ReactAndroid/build/
 /packages/react-native/ReactAndroid/.cxx/
 /packages/react-native/ReactAndroid/gradle/
@@ -39,8 +40,8 @@ project.xcworkspace
 /packages/react-native/ReactAndroid/external-artifacts/artifacts/
 /packages/react-native/ReactAndroid/hermes-engine/build/
 /packages/react-native/ReactAndroid/hermes-engine/.cxx/
-/packages/helloworld/android/app/build/
-/packages/helloworld/android/build/
+/private/helloworld/android/app/build/
+/private/helloworld/android/build/
 /packages/react-native-popup-menu-android/android/build/
 /packages/react-native-test-library/android/build/
 
@@ -107,33 +108,42 @@ package-lock.json
 
 # Ruby Gems (Bundler)
 /packages/react-native/vendor
-/packages/helloworld/vendor
+/private/helloworld/vendor
 .ruby-version
 /**/.ruby-version
 vendor/
 
 # iOS / CocoaPods
-/packages/helloworld/ios/build/
-/packages/helloworld/ios/Pods/
-/packages/helloworld/ios/Podfile.lock
+/private/helloworld/ios/build/
+/private/helloworld/ios/Pods/
+/private/helloworld/ios/Podfile.lock
+/packages/rn-tester/bin/
+/packages/rn-tester/cache/
+/packages/rn-tester/extensions/
+/packages/rn-tester/gems/
+/packages/rn-tester/specifications/
 /packages/rn-tester/Gemfile.lock
 /packages/**/RCTLegacyInteropComponents.mm
+/packages/sourcemap.ios.map
 
 # Ignore RNTester specific Pods, but keep the __offline_mirrors__ here.
 /packages/rn-tester/Pods/*
 !/packages/rn-tester/Pods/__offline_mirrors_hermes__
 !/packages/rn-tester/Pods/__offline_mirrors_jsc__
 
+# Swift Package build folder
+/packages/react-native/.build
+/packages/react-native/.swiftpm
+
 # @react-native/codegen
 /packages/react-native/React/FBReactNativeSpec/
 /packages/react-native-codegen/lib
 /packages/react-native-codegen/tmp/
-/packages/react-native/ReactCommon/react/renderer/components/rncore/
 /packages/rn-tester/NativeModuleExample/ScreenshotManagerSpec*
 /**/RCTThirdPartyFabricComponentsProvider.*
 
 # @react-native/codegen-typescript-test
-/packages/react-native-codegen-typescript-test/lib
+/private/react-native-codegen-typescript-test/lib
 
 # Additional SDKs
 /packages/react-native/sdks/download
@@ -160,8 +170,11 @@ fix_*.patch
 .metro-health-check*
 
 # Jest Integration
-/packages/react-native-fantom/build/
-/packages/react-native-fantom/tester/build/
+/private/react-native-fantom/build/
+/private/react-native-fantom/tester/build/
 
 # [Experimental] Generated TS type definitions
 /packages/**/types_generated/
+
+/packages/debugger-shell/build/
+/packages/*/dist/

ECOSYSTEM.md

@@ -28,7 +28,7 @@ Examples of contributing to the release include being a [community releaser](htt
 
 ### Current partners:
 * **[Coinbase](https://www.coinbase.com/):** Publishes [posts](https://blog.coinbase.com/tagged/react-native) advocating React Native usage. Supports `@react-native-community/datetimepicker` and other community modules to migrate to the new architecture. Supports releases in testing and feedback.
-* **[Callstack](https://callstack.com/):** Maintains the [React Native CLI](https://github.com/react-native-community/react-native-cli) and [other community libraries](https://github.com/callstack), organizes [React Native EU](https://react-native.eu/) and hosts [The React Native Show podcast](https://www.callstack.com/podcast-react-native-show)
+* **[Callstack](https://callstack.com/):** Maintains [React Native Community CLI](https://github.com/react-native-community/cli), develops [RNEF](https://rnef.dev), [Re.Pack](https://re-pack.dev) and [other community libraries](https://github.com/callstack). Hosts [React Universe Conf](https://www.reactuniverseconf.com/) and [React Universe On Air](https://www.callstack.com/podcast).
 * **[Expo](https://expo.dev/):** Builds [Expo Go and SDK](https://github.com/expo/expo), [Snack](https://snack.expo.dev/), and [Expo Application Services](https://expo.dev/eas). Maintains [React Native Directory](https://reactnative.directory/), stewards [React Navigation](https://reactnavigation.org/) along with other partners.
 * **[Infinite Red](https://infinite.red/):** Maintains the [ignite cli/boilerplate](https://github.com/infinitered/ignite), organizes [Chain React Conf](https://cr.infinite.red/), hosts the [React Native Radio podcast](https://reactnativeradio.com), publishes the [React Native Newsletter](https://reactnativenewsletter.com)
 * **[Meta](https://opensource.fb.com/):** Oversees the React Native product and maintains the [React Native core repo](https://reactnative.dev/) 

__docs__/README.md

@@ -45,6 +45,8 @@ TODO: Explain the different components of React Native at a high level.
     - UI / Fabric
       - Events
       - Shadow Tree Lifecycle
+        - [Runtime Shadow Node Reference Update](../packages/react-native/ReactCommon/react/renderer/core/__docs__/RSNRU.md)
+        - [passChildrenWhenCloningPersistedNodes](../packages/react-native/ReactCommon/react/renderer/core/__docs__/passChildrenWhenCloning.md)
       - Layout
       - Mounting
     - Native Modules / TurboModules
@@ -88,7 +90,7 @@ TODO: Explain the different components of React Native at a high level.
     - Jest
     - ESLint
   - Integration / E2E
-    - [Fantom](../packages/react-native-fantom/__docs__/README.md)
+    - [Fantom](../private/react-native-fantom/__docs__/README.md)
 - Tooling
   - React Native DevTools
 

build.gradle.kts

@@ -13,6 +13,7 @@ plugins {
   alias(libs.plugins.kotlin.android) apply false
   alias(libs.plugins.binary.compatibility.validator) apply true
   alias(libs.plugins.android.test) apply false
+  alias(libs.plugins.ktfmt) apply true
 }
 
 val reactAndroidProperties = java.util.Properties()
@@ -55,6 +56,8 @@ nexusPublishing {
     sonatype {
       username.set(sonatypeUsername)
       password.set(sonatypePassword)
+      nexusUrl.set(uri("https://ossrh-staging-api.central.sonatype.com/service/local/"))
+      snapshotRepositoryUrl.set(uri("https://central.sonatype.com/repository/maven-snapshots/"))
     }
   }
 }
@@ -122,9 +125,36 @@ if (project.findProperty("react.internal.useHermesNightly")?.toString()?.toBoole
     configurations.all {
       resolutionStrategy.dependencySubstitution {
         substitute(project(":packages:react-native:ReactAndroid:hermes-engine"))
-            .using(module("com.facebook.react:hermes-android:0.0.0-+"))
+            .using(module("com.facebook.react:hermes-android:0.+"))
             .because("Users opted to use hermes from nightly")
       }
     }
   }
 }
+
+ktfmt {
+  blockIndent.set(2)
+  continuationIndent.set(4)
+  maxWidth.set(100)
+  removeUnusedImports.set(false)
+  manageTrailingCommas.set(false)
+}
+
+// Configure ktfmt tasks to include gradle-plugin
+listOf("ktfmtCheck", "ktfmtFormat").forEach { taskName ->
+  tasks.named(taskName) { dependsOn(gradle.includedBuild("gradle-plugin").task(":$taskName")) }
+}
+
+allprojects {
+  // Apply exclusions for specific files that should not be formatted
+  val excludePatterns =
+      listOf(
+          "**/build/**",
+          "**/hermes-engine/**",
+          "**/internal/featureflags/**",
+          "**/systeminfo/ReactNativeVersion.kt")
+  listOf(
+          com.ncorti.ktfmt.gradle.tasks.KtfmtCheckTask::class,
+          com.ncorti.ktfmt.gradle.tasks.KtfmtFormatTask::class)
+      .forEach { tasks.withType(it) { exclude(excludePatterns) } }
+}

flow-typed/environment/node.js

@@ -4,8 +4,8 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
+ * @flow
  * @format
- * @oncall flow
  */
 
 // Adapted from https://github.com/flow-typed/flow-typed/blob/main/definitions/environments/node/flow_v0.261.x-/node.js
@@ -3229,6 +3229,73 @@ declare module 'util' {
     isWebAssemblyCompiledModule: (value: mixed) => boolean,
     ...
   };
+
+  declare type BackgroundColors =
+    | 'bgBlack'
+    | 'bgBlackBright'
+    | 'bgBlue'
+    | 'bgBlueBright'
+    | 'bgCyan'
+    | 'bgCyanBright'
+    | 'bgGray'
+    | 'bgGreen'
+    | 'bgGreenBright'
+    | 'bgGrey'
+    | 'bgMagenta'
+    | 'bgMagentaBright'
+    | 'bgRed'
+    | 'bgRedBright'
+    | 'bgWhite'
+    | 'bgWhiteBright'
+    | 'bgYellow'
+    | 'bgYellowBright';
+
+  declare type ForegroundColors =
+    | 'black'
+    | 'blackBright'
+    | 'blue'
+    | 'blueBright'
+    | 'cyan'
+    | 'cyanBright'
+    | 'gray'
+    | 'green'
+    | 'greenBright'
+    | 'grey'
+    | 'magenta'
+    | 'magentaBright'
+    | 'red'
+    | 'redBright'
+    | 'white'
+    | 'whiteBright'
+    | 'yellow'
+    | 'yellowBright';
+
+  declare type Modifiers =
+    | 'blink'
+    | 'bold'
+    | 'dim'
+    | 'doubleunderline'
+    | 'framed'
+    | 'hidden'
+    | 'inverse'
+    | 'italic'
+    | 'overlined'
+    | 'reset'
+    | 'strikethrough'
+    | 'underline';
+
+  declare function styleText(
+    format:
+      | ForegroundColors
+      | BackgroundColors
+      | Modifiers
+      | $ReadOnlyArray<ForegroundColors | BackgroundColors | Modifiers>,
+    text: string,
+    options?: $ReadOnly<{
+      stream?: ?stream$Stream,
+      validStream?: ?boolean,
+    }>,
+  ): string;
 }
 
 type vm$ScriptOptions = {

flow-typed/npm/@react-native-community/cli-server-api_v19.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module '@react-native-community/cli-server-api' {

flow-typed/npm/@react-native-community/cli-types_v19.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow
  * @format
- * @oncall react_native
  */
 
 declare module '@react-native-community/cli-types' {

flow-typed/npm/@tsconfig/node22_v22.x.x.js

@@ -8,6 +8,6 @@
  * @format
  */
 
-declare module '@tsconfig/node18/tsconfig.json' {
+declare module '@tsconfig/node22/tsconfig.json' {
   declare module.exports: any;
 }

flow-typed/npm/actual-request-url_v1.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 declare module 'actual-request-url' {

flow-typed/npm/babel-traverse_v7.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow
  * @format
- * @oncall react_native
  */
 
 // The sections between BEGIN GENERATED and END GENERATED are generated

flow-typed/npm/chalk_v4.x.x.js

@@ -1,231 +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
- * @oncall react_native
- */
-
-// flow-typed signature: 79cfa6bcaa67fdb60f10d320da0470fc
-// flow-typed version: 6cecea2e51/chalk_v4.x.x/flow_>=v0.104.x
-
-// From: https://github.com/chalk/chalk/blob/master/index.d.ts
-
-declare module 'chalk' {
-  declare type ForegroundColor =
-    | 'black'
-    | 'red'
-    | 'green'
-    | 'yellow'
-    | 'blue'
-    | 'magenta'
-    | 'cyan'
-    | 'white'
-    | 'gray'
-    | 'grey'
-    | 'blackBright'
-    | 'redBright'
-    | 'greenBright'
-    | 'yellowBright'
-    | 'blueBright'
-    | 'magentaBright'
-    | 'cyanBright'
-    | 'whiteBright';
-
-  declare type BackgroundColor =
-    | 'bgBlack'
-    | 'bgRed'
-    | 'bgGreen'
-    | 'bgYellow'
-    | 'bgBlue'
-    | 'bgMagenta'
-    | 'bgCyan'
-    | 'bgWhite'
-    | 'bgGray'
-    | 'bgGrey'
-    | 'bgBlackBright'
-    | 'bgRedBright'
-    | 'bgGreenBright'
-    | 'bgYellowBright'
-    | 'bgBlueBright'
-    | 'bgMagentaBright'
-    | 'bgCyanBright'
-    | 'bgWhiteBright';
-
-  declare type Color = ForegroundColor | BackgroundColor;
-
-  declare type Modifiers =
-    | 'reset'
-    | 'bold'
-    | 'dim'
-    | 'italic'
-    | 'underline'
-    | 'inverse'
-    | 'hidden'
-    | 'strikethrough'
-    | 'visible';
-
-  declare type TemplateStringsArray = $ReadOnlyArray<string>;
-
-  declare type Level = $Values<{
-    None: 0,
-    Basic: 1,
-    Ansi256: 2,
-    TrueColor: 3,
-    ...
-  }>;
-
-  declare type ChalkOptions = {|
-    level?: Level,
-  |};
-
-  declare type ColorSupport = {|
-    level: Level,
-    hasBasic: boolean,
-    has256: boolean,
-    has16m: boolean,
-  |};
-
-  declare class Instance implements Chalk {
-    constructor(options?: ChalkOptions): this;
-
-    (...text: string[]): string;
-    (text: TemplateStringsArray, ...placeholders: string[]): string;
-    Instance: typeof Instance;
-    level: Level;
-    rgb(r: number, g: number, b: number): Chalk;
-    hsl(h: number, s: number, l: number): Chalk;
-    hsv(h: number, s: number, v: number): Chalk;
-    hwb(h: number, w: number, b: number): Chalk;
-    bgHex(color: string): Chalk;
-    bgKeyword(color: string): Chalk;
-    bgRgb(r: number, g: number, b: number): Chalk;
-    bgHsl(h: number, s: number, l: number): Chalk;
-    bgHsv(h: number, s: number, v: number): Chalk;
-    bgHwb(h: number, w: number, b: number): Chalk;
-    hex(color: string): Chalk;
-    keyword(color: string): Chalk;
-
-    +reset: Chalk;
-    +bold: Chalk;
-    +dim: Chalk;
-    +italic: Chalk;
-    +underline: Chalk;
-    +inverse: Chalk;
-    +hidden: Chalk;
-    +strikethrough: Chalk;
-
-    +visible: Chalk;
-
-    +black: Chalk;
-    +red: Chalk;
-    +green: Chalk;
-    +yellow: Chalk;
-    +blue: Chalk;
-    +magenta: Chalk;
-    +cyan: Chalk;
-    +white: Chalk;
-    +gray: Chalk;
-    +grey: Chalk;
-    +blackBright: Chalk;
-    +redBright: Chalk;
-    +greenBright: Chalk;
-    +yellowBright: Chalk;
-    +blueBright: Chalk;
-    +magentaBright: Chalk;
-    +cyanBright: Chalk;
-    +whiteBright: Chalk;
-
-    +bgBlack: Chalk;
-    +bgRed: Chalk;
-    +bgGreen: Chalk;
-    +bgYellow: Chalk;
-    +bgBlue: Chalk;
-    +bgMagenta: Chalk;
-    +bgCyan: Chalk;
-    +bgWhite: Chalk;
-    +bgBlackBright: Chalk;
-    +bgRedBright: Chalk;
-    +bgGreenBright: Chalk;
-    +bgYellowBright: Chalk;
-    +bgBlueBright: Chalk;
-    +bgMagentaBright: Chalk;
-    +bgCyanBright: Chalk;
-    +bgWhiteBright: Chalk;
-
-    supportsColor: ColorSupport;
-  }
-
-  declare interface Chalk {
-    (...text: string[]): string;
-    (text: TemplateStringsArray, ...placeholders: string[]): string;
-    Instance: typeof Instance;
-    level: Level;
-    rgb(r: number, g: number, b: number): Chalk;
-    hsl(h: number, s: number, l: number): Chalk;
-    hsv(h: number, s: number, v: number): Chalk;
-    hwb(h: number, w: number, b: number): Chalk;
-    bgHex(color: string): Chalk;
-    bgKeyword(color: string): Chalk;
-    bgRgb(r: number, g: number, b: number): Chalk;
-    bgHsl(h: number, s: number, l: number): Chalk;
-    bgHsv(h: number, s: number, v: number): Chalk;
-    bgHwb(h: number, w: number, b: number): Chalk;
-    hex(color: string): Chalk;
-    keyword(color: string): Chalk;
-
-    +reset: Chalk;
-    +bold: Chalk;
-    +dim: Chalk;
-    +italic: Chalk;
-    +underline: Chalk;
-    +inverse: Chalk;
-    +hidden: Chalk;
-    +strikethrough: Chalk;
-
-    +visible: Chalk;
-
-    +black: Chalk;
-    +red: Chalk;
-    +green: Chalk;
-    +yellow: Chalk;
-    +blue: Chalk;
-    +magenta: Chalk;
-    +cyan: Chalk;
-    +white: Chalk;
-    +gray: Chalk;
-    +grey: Chalk;
-    +blackBright: Chalk;
-    +redBright: Chalk;
-    +greenBright: Chalk;
-    +yellowBright: Chalk;
-    +blueBright: Chalk;
-    +magentaBright: Chalk;
-    +cyanBright: Chalk;
-    +whiteBright: Chalk;
-
-    +bgBlack: Chalk;
-    +bgRed: Chalk;
-    +bgGreen: Chalk;
-    +bgYellow: Chalk;
-    +bgBlue: Chalk;
-    +bgMagenta: Chalk;
-    +bgCyan: Chalk;
-    +bgWhite: Chalk;
-    +bgBlackBright: Chalk;
-    +bgRedBright: Chalk;
-    +bgGreenBright: Chalk;
-    +bgYellowBright: Chalk;
-    +bgBlueBright: Chalk;
-    +bgMagentaBright: Chalk;
-    +bgCyanBright: Chalk;
-    +bgWhiteBright: Chalk;
-
-    supportsColor: ColorSupport;
-  }
-
-  declare module.exports: Chalk;
-}

flow-typed/npm/chrome-launcher_v0.15.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'chrome-launcher' {

flow-typed/npm/chromium-edge-launcher_v0.2.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'chromium-edge-launcher' {

flow-typed/npm/commander_v12.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  * @generated
  */
 

flow-typed/npm/connect_v3.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'connect' {

flow-typed/npm/cross-spawn_v7.x.x.js

@@ -0,0 +1,20 @@
+/**
+ * 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
+ * @format
+ */
+
+declare module 'cross-spawn' {
+  import * as child_process from 'child_process';
+
+  type spawn = typeof child_process.spawn & {
+    spawn: spawn,
+    sync: typeof child_process.spawnSync,
+  };
+
+  declare module.exports: spawn;
+}

flow-typed/npm/electron-packager_v18.x.x.js

@@ -0,0 +1,149 @@
+/**
+ * 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
+ */
+
+declare module '@electron/packager' {
+  declare export type AsarOptions = $FlowFixMe;
+
+  declare export type ElectronDownloadRequestOptions = $FlowFixMe;
+
+  declare export type TargetDefinition = {
+    arch: TargetArch,
+    platform: TargetPlatform,
+  };
+
+  declare export type FinalizePackageTargetsHookFunction = (
+    targets: TargetDefinition[],
+    callback: HookFunctionErrorCallback,
+  ) => void;
+
+  declare export type HookFunction = (
+    buildPath: string,
+    electronVersion: string,
+    platform: TargetPlatform,
+    arch: TargetArch,
+    callback: HookFunctionErrorCallback,
+  ) => void;
+
+  declare export type IgnoreFunction = (path: string) => boolean;
+
+  declare export type HookFunctionErrorCallback = (err?: Error | null) => void;
+
+  declare export interface MacOSProtocol {
+    name: string;
+    schemes: string[];
+  }
+
+  declare export type NotaryToolCredentials = $FlowFixMe;
+
+  declare export type OsxSignOptions = $FlowFixMe;
+
+  declare export type OsxUniversalOptions = $FlowFixMe;
+
+  declare export type Win32MetadataOptions = $ReadOnly<{
+    CompanyName?: string,
+    FileDescription?: string,
+    OriginalFilename?: string,
+    ProductName?: string,
+    InternalName?: string,
+    'requested-execution-level'?:
+      | 'asInvoker'
+      | 'highestAvailable'
+      | 'requireAdministrator',
+    'application-manifest'?: string,
+  }>;
+
+  declare export type WindowsSignOptions = $FlowFixMe;
+
+  declare export type OfficialArch =
+    | 'ia32'
+    | 'x64'
+    | 'armv7l'
+    | 'arm64'
+    | 'mips64el'
+    | 'universal';
+
+  declare export type OfficialPlatform = 'linux' | 'win32' | 'darwin' | 'mas';
+
+  declare export type TargetArch = OfficialArch | string;
+
+  declare export type TargetPlatform = OfficialPlatform | string;
+
+  declare export type ArchOption = TargetArch | 'all';
+
+  declare export type PlatformOption = TargetPlatform | 'all';
+
+  declare export interface Options {
+    dir: string;
+    afterAsar?: HookFunction[];
+    afterComplete?: HookFunction[];
+    afterCopy?: HookFunction[];
+    afterCopyExtraResources?: HookFunction[];
+    afterExtract?: HookFunction[];
+    afterFinalizePackageTargets?: FinalizePackageTargetsHookFunction[];
+    afterInitialize?: HookFunction[];
+    afterPrune?: HookFunction[];
+    all?: boolean;
+    appBundleId?: string;
+    appCategoryType?: string;
+    appCopyright?: string;
+    appVersion?: string;
+    arch?: ArchOption | ArchOption[];
+    asar?: boolean | AsarOptions;
+    beforeAsar?: HookFunction[];
+    beforeCopy?: HookFunction[];
+    beforeCopyExtraResources?: HookFunction[];
+    buildVersion?: string;
+    darwinDarkModeSupport?: boolean;
+    derefSymlinks?: boolean;
+    download?: ElectronDownloadRequestOptions;
+    electronVersion?: string;
+    electronZipDir?: string;
+    executableName?: string;
+    extendHelperInfo?:
+      | string
+      | {
+          [property: string]: any,
+        };
+    extendInfo?:
+      | string
+      | {
+          [property: string]: any,
+        };
+    extraResource?: string | string[];
+    helperBundleId?: string;
+    icon?: string;
+    ignore?: RegExp | (string | RegExp)[] | IgnoreFunction;
+    junk?: boolean;
+    name?: string;
+    osxNotarize?: NotaryToolCredentials;
+    osxSign?: true | OsxSignOptions;
+    osxUniversal?: OsxUniversalOptions;
+    out?: string;
+    overwrite?: boolean;
+    platform?: TargetPlatform | 'all' | Array<TargetPlatform | 'all'>;
+    prebuiltAsar?: string;
+    protocols?: MacOSProtocol[];
+    prune?: boolean;
+    quiet?: boolean;
+    tmpdir?: string | false;
+    usageDescription?: {
+      [property: string]: string,
+    };
+    win32metadata?: Win32MetadataOptions;
+    windowsSign?: true | WindowsSignOptions;
+  }
+
+  declare function packager(options: Options): Promise<string[]>;
+
+  declare module.exports: typeof packager & {
+    packager: typeof packager,
+    default: typeof packager,
+  };
+}

flow-typed/npm/electron_v36.x.x.js

@@ -6,9 +6,9 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
-module.exports = {
-  enableFabricCompleteRootInCommitPhase: true,
-};
+// Types for Electron when required as a Node package.
+declare module 'electron' {
+  declare module.exports: string;
+}

flow-typed/npm/execa_v5.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 // Modified from flow-typed repo:

flow-typed/npm/jest-diff_v29.x.x.js

@@ -3,7 +3,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'jest-diff' {

flow-typed/npm/jest-snapshot_v29.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'jest-snapshot' {

flow-typed/npm/jest.js

@@ -4,8 +4,8 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
+ * @flow
  * @format
- * @oncall react_native
  */
 
 // Modified from https://raw.githubusercontent.com/flow-typed/flow-typed/master/definitions/npm/jest_v29.x.x/flow_v0.134.x-/jest_v29.x.x.js
@@ -854,6 +854,10 @@ type JestObjectType = {
    * Returns the number of fake timers still left to run.
    */
   getTimerCount(): number,
+  /**
+   * Returns the time in ms of the current clock.
+   */
+  now(): number,
   /**
    * Set the current system time used by fake timers.
    * Simulates a user changing the system clock while your program is running.

flow-typed/npm/node-fetch_v2.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 // Modified from flow-typed repo:

flow-typed/npm/open_v7.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'open' {

flow-typed/npm/pretty-format_v29.x.x.js

@@ -3,7 +3,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 declare type Print = (value: mixed) => string;
 declare type Indent = (value: string) => string;

flow-typed/npm/selfsigned_v2.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 declare module 'selfsigned' {

flow-typed/npm/serve-static_v1.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'serve-static' {

flow-typed/npm/signedsource_v1.x.x.js

@@ -1,8 +1,8 @@
 /**
  * (c) Meta Platforms, Inc. and affiliates. Confidential and proprietary.
  *
- * @format
  * @flow strict
+ * @format
  */
 
 declare module 'signedsource' {

flow-typed/npm/tinybench_v3.1.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare module 'tinybench' {

flow-typed/npm/typescript_v5.x.x.js

@@ -48,6 +48,11 @@ declare module 'typescript' {
       file: SourceFile,
       start?: number,
     ): $ReadOnly<{line: number, character: number}>,
+    convertCompilerOptionsFromJson(
+      jsonOptions: any,
+      basePath: string,
+      configFileName?: string,
+    ): {options: Object, errors: Diagnostic[]},
     ModuleResolutionKind: typeof ModuleResolutionKind,
     ...
   };

flow-typed/npm/undici_v5.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 // Very incomplete types for the undici package.

flow-typed/npm/wait-for-expect_v3.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 declare module 'wait-for-expect' {

flow-typed/npm/ws_v7.x.x.js

@@ -6,7 +6,6 @@
  *
  * @flow strict
  * @format
- * @oncall react_native
  */
 
 declare type ws$PerMessageDeflateOptions = {

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.14.3-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

jest.config.js

@@ -4,16 +4,19 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
+ * @flow strict
  * @format
  */
 
 'use strict';
 
+// $FlowFixMe[cannot-resolve-module]
+// $FlowFixMe[untyped-import]
 const {defaults} = require('jest-config');
 
 const PODS_LOCATIONS = [
   'packages/rn-tester/Pods',
-  'packages/helloworld/ios/Pods',
+  'private/helloworld/ios/Pods',
 ];
 
 module.exports = {
@@ -39,18 +42,21 @@ module.exports = {
     '<rootDir>/packages/react-native/Libraries/Renderer',
     '<rootDir>/packages/react-native/sdks/hermes/',
     ...PODS_LOCATIONS,
-  ],
+  ] /*:: as $ReadOnlyArray<string> */,
   transformIgnorePatterns: ['node_modules/(?!@react-native/)'],
   haste: {
     defaultPlatform: 'ios',
     platforms: ['ios', 'android'],
   },
-  moduleFileExtensions: ['fb.js'].concat(defaults.moduleFileExtensions),
+  moduleFileExtensions: [
+    'fb.js',
+    ...defaults.moduleFileExtensions,
+  ] /*:: as $ReadOnlyArray<string> */,
   modulePathIgnorePatterns: [
     'scripts/.*/__fixtures__/',
     '<rootDir>/packages/react-native/sdks/hermes/',
     ...PODS_LOCATIONS,
-  ],
+  ] /*:: as $ReadOnlyArray<string> */,
   unmockedModulePathPatterns: [
     'node_modules/react/',
     'packages/react-native/Libraries/Renderer',

jest/preprocessor.js

@@ -4,15 +4,15 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @format
  * @flow
+ * @format
  */
 
 /* eslint-env node */
 
 'use strict';
 
-// eslint-disable-next-line lint/sort-imports
+// eslint-disable-next-line @react-native/monorepo/sort-imports
 const {
   transformFromAstSync: babelTransformFromAstSync,
   transformSync: babelTransformSync,
@@ -32,7 +32,7 @@ if (process.env.FBSOURCE_ENV === '1') {
   require('@fb-tools/babel-register');
 } else {
   // Register Babel to allow local packages to be loaded from source
-  require('../scripts/babel-register').registerForMonorepo();
+  require('../scripts/shared/babelRegister').registerForMonorepo();
 }
 
 const transformer = require('@react-native/metro-babel-transformer');
@@ -59,6 +59,9 @@ const babelPluginPreventBabelRegister = [
 
 module.exports = {
   process(src /*: string */, file /*: string */) /*: {code: string, ...} */ {
+    if (file.endsWith('.json')) {
+      return {code: src};
+    }
     if (nodeFiles.test(file)) {
       // node specific transforms only
       return babelTransformSync(src, {

package.json

@@ -8,18 +8,21 @@
     "android": "yarn --cwd packages/rn-tester android",
     "build-android": "./gradlew :packages:react-native:ReactAndroid:build",
     "build": "node ./scripts/build/build.js",
-    "build-types": "node ./scripts/build-types",
+    "build-types": "node ./scripts/js-api/build-types",
     "clang-format": "clang-format -i --glob=*/**/*.{h,cpp,m,mm}",
     "clean": "node ./scripts/build/clean.js",
+    "cxx-api-build": "node ./scripts/cxx-api/public-api.js",
     "flow-check": "flow check",
     "flow": "flow",
     "format-check": "prettier --list-different \"./**/*.{js,md,yml,ts,tsx}\"",
     "format": "npm run prettier && npm run clang-format",
     "featureflags": "yarn --cwd packages/react-native featureflags",
+    "js-api-diff": "node ./scripts/js-api/diff-api-snapshot",
     "lint-ci": "./.github/workflow-scripts/analyze_code.sh && yarn shellcheck",
-    "lint-java": "node ./scripts/lint-java.js",
+    "lint-kotlin-check": "./gradlew ktfmtCheck",
+    "lint-kotlin": "./gradlew ktfmtFormat",
     "lint-markdown": "markdownlint-cli2 2>&1",
-    "lint": "eslint .",
+    "lint": "eslint --max-warnings 0 .",
     "prettier": "prettier --write \"./**/*.{js,md,yml,ts,tsx}\"",
     "print-packages": "node ./scripts/monorepo/print",
     "shellcheck": "./.github/workflow-scripts/analyze_scripts.sh",
@@ -27,20 +30,20 @@
     "set-version": "node ./scripts/releases/set-version.js",
     "test-android": "./gradlew :packages:react-native:ReactAndroid:test",
     "test-ci": "jest --maxWorkers=2 --ci --reporters=\"default\" --reporters=\"jest-junit\"",
-    "test-e2e-local-clean": "node ./scripts/release-testing/test-e2e-local-clean.js",
-    "test-e2e-local": "node ./scripts/release-testing/test-e2e-local.js",
+    "test-release-local-clean": "node ./scripts/release-testing/test-release-local-clean.js",
+    "test-release-local": "node ./scripts/release-testing/test-release-local.js",
     "test-ios": "./scripts/objc-test.sh test",
-    "test-typescript-offline": "dtslint --localTs node_modules/typescript/lib  packages/react-native/types",
-    "test-typescript": "dtslint packages/react-native/types",
+    "test-typescript": "tsc -p packages/react-native/types/tsconfig.json",
+    "test-generated-typescript": "tsc -p packages/react-native/types_generated/tsconfig.test.json",
     "test": "jest",
-    "fantom": "JS_DIR='..' yarn jest --config packages/react-native-fantom/config/jest.config.js",
+    "fantom": "./scripts/fantom.sh",
     "trigger-react-native-release": "node ./scripts/releases-local/trigger-react-native-release.js",
     "update-lock": "npx yarn-deduplicate"
   },
   "workspaces": [
     "packages/*",
-    "tools/*",
-    "!packages/helloworld"
+    "private/*",
+    "!private/helloworld"
   ],
   "devDependencies": {
     "@babel/core": "^7.25.2",
@@ -50,19 +53,19 @@
     "@babel/plugin-transform-regenerator": "^7.24.7",
     "@babel/preset-env": "^7.25.3",
     "@babel/preset-flow": "^7.24.7",
-    "@definitelytyped/dtslint": "^0.0.127",
+    "@electron/packager": "^18.3.6",
     "@jest/create-cache-key-function": "^29.7.0",
-    "@react-native/metro-babel-transformer": "0.80.0-main",
-    "@react-native/metro-config": "0.80.0-main",
-    "@tsconfig/node18": "1.0.1",
-    "@types/react": "^19.0.0",
-    "@typescript-eslint/parser": "^7.1.1",
+    "@microsoft/api-extractor": "^7.52.2",
+    "@react-native/metro-babel-transformer": "0.81.0-main",
+    "@react-native/metro-config": "0.81.0-main",
+    "@tsconfig/node22": "22.0.2",
+    "@types/react": "^19.1.0",
+    "@typescript-eslint/parser": "^8.36.0",
     "ansi-styles": "^4.2.1",
     "babel-plugin-minify-dead-code-elimination": "^0.5.2",
-    "babel-plugin-syntax-hermes-parser": "0.28.1",
+    "babel-plugin-syntax-hermes-parser": "0.29.1",
     "babel-plugin-transform-define": "^2.1.4",
     "babel-plugin-transform-flow-enums": "^0.0.2",
-    "chalk": "^4.0.0",
     "clang-format": "^1.8.0",
     "connect": "^3.6.5",
     "debug": "^4.4.0",
@@ -74,17 +77,16 @@
     "eslint-plugin-ft-flow": "^2.0.1",
     "eslint-plugin-jest": "^27.9.0",
     "eslint-plugin-jsx-a11y": "^6.6.0",
-    "eslint-plugin-lint": "^1.0.0",
     "eslint-plugin-react": "^7.30.1",
-    "eslint-plugin-react-hooks": "^5.2.0",
     "eslint-plugin-react-native": "^4.0.0",
     "eslint-plugin-redundant-undefined": "^0.4.0",
     "eslint-plugin-relay": "^1.8.3",
-    "flow-api-translator": "0.28.1",
-    "flow-bin": "^0.269.1",
+    "flow-api-translator": "0.29.1",
+    "flow-bin": "^0.275.0",
     "glob": "^7.1.1",
-    "hermes-eslint": "0.28.1",
-    "hermes-transform": "0.28.1",
+    "hermes-eslint": "0.29.1",
+    "hermes-transform": "0.29.1",
+    "ini": "^5.0.0",
     "inquirer": "^7.1.0",
     "jest": "^29.7.0",
     "jest-config": "^29.7.0",
@@ -93,25 +95,27 @@
     "jest-snapshot": "^29.7.0",
     "markdownlint-cli2": "^0.17.2",
     "markdownlint-rule-relative-links": "^3.0.0",
-    "metro-babel-register": "^0.82.2",
-    "metro-memory-fs": "^0.82.2",
-    "metro-transform-plugins": "^0.82.2",
+    "memfs": "^4.7.7",
+    "metro-babel-register": "^0.83.0",
+    "metro-transform-plugins": "^0.83.0",
     "micromatch": "^4.0.4",
     "node-fetch": "^2.2.0",
     "nullthrows": "^1.1.1",
     "prettier": "2.8.8",
-    "prettier-plugin-hermes-parser": "0.28.1",
+    "prettier-plugin-hermes-parser": "0.29.1",
     "react": "19.1.0",
     "react-test-renderer": "19.1.0",
     "rimraf": "^3.0.2",
     "shelljs": "^0.8.5",
     "signedsource": "^1.0.0",
     "supports-color": "^7.1.0",
+    "temp-dir": "^2.0.0",
     "tinybench": "^3.1.0",
-    "typescript": "5.0.4",
+    "typescript": "5.8.3",
     "ws": "^6.2.3"
   },
   "resolutions": {
+    "eslint-plugin-react-hooks": "6.1.0-canary-12bc60f5-20250613",
     "react-is": "19.1.0"
   }
 }

packages/assets/__tests__/path-support-test.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import {getAndroidResourceFolderName} from '../path-support';

packages/assets/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@react-native/assets-registry",
-  "version": "0.80.0-main",
+  "version": "0.81.0-main",
   "description": "Asset support code for React Native.",
   "license": "MIT",
   "repository": {
@@ -17,7 +17,7 @@
   ],
   "bugs": "https://github.com/facebook/react-native/issues",
   "engines": {
-    "node": ">=18"
+    "node": ">= 20.19.4"
   },
   "files": [
     "path-support.js",

packages/assets/registry.js

@@ -40,5 +40,5 @@ function getAssetByID(assetId /*: number */) /*: PackagerAsset */ {
   return assets[assetId - 1];
 }
 
-// eslint-disable-next-line lint/no-commonjs-exports
+// eslint-disable-next-line @react-native/monorepo/no-commonjs-exports
 module.exports = {registerAsset, getAssetByID};

packages/babel-plugin-codegen/__tests__/index-test.js

@@ -4,24 +4,27 @@
  * 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
- * @oncall react_native
  */
 
-'use strict';
+import failures from '../__test_fixtures__/failures.js';
+import fixtures from '../__test_fixtures__/fixtures.js';
+import {transformSync} from '@babel/core';
 
-const failures = require('../__test_fixtures__/failures.js');
-const fixtures = require('../__test_fixtures__/fixtures.js');
-const {transform: babelTransform} = require('@babel/core');
-
-const transform = (fixture, filename) =>
-  babelTransform(fixture, {
+const transform = (fixture /*: string */, filename /*: string */) =>
+  transformSync(fixture, {
     babelrc: false,
     browserslistConfigFile: false,
     cwd: '/',
-    filename: filename,
+    filename,
     highlightCode: false,
-    plugins: [require('@babel/plugin-syntax-flow'), require('../index')],
+    plugins: [
+      // $FlowFixMe[untyped-import]
+      require('@babel/plugin-syntax-flow'),
+      // $FlowFixMe[untyped-import]
+      require('../index'),
+    ],
   }).code;
 
 describe('Babel plugin inline view configs', () => {

packages/babel-plugin-codegen/index.js

@@ -4,6 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
+ * @noflow
  * @format
  */
 
@@ -23,16 +24,19 @@ try {
 } catch (e) {
   // Fallback to lib when source doesn't exit (e.g. when installed as a dev dependency)
   FlowParser =
+    // $FlowIgnore[cannot-resolve-module]
     require('@react-native/codegen/lib/parsers/flow/parser').FlowParser;
   TypeScriptParser =
+    // $FlowIgnore[cannot-resolve-module]
     require('@react-native/codegen/lib/parsers/typescript/parser').TypeScriptParser;
+  // $FlowIgnore[cannot-resolve-module]
   RNCodegen = require('@react-native/codegen/lib/generators/RNCodegen');
 }
 
 const flowParser = new FlowParser();
 const typeScriptParser = new TypeScriptParser();
 
-function parseFile(filename, code) {
+function parseFile(filename /*: string */, code /*: string */) {
   if (filename.endsWith('js')) {
     return flowParser.parseString(code);
   }
@@ -46,7 +50,7 @@ function parseFile(filename, code) {
   );
 }
 
-function generateViewConfig(filename, code) {
+function generateViewConfig(filename /*: string */, code /*: string */) {
   const schema = parseFile(filename, code);
 
   const libraryName = basename(filename).replace(
@@ -54,8 +58,8 @@ function generateViewConfig(filename, code) {
     '',
   );
   return RNCodegen.generateViewConfig({
-    schema,
     libraryName,
+    schema,
   });
 }
 

packages/babel-plugin-codegen/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@react-native/babel-plugin-codegen",
-  "version": "0.80.0-main",
+  "version": "0.81.0-main",
   "description": "Babel plugin to generate native module and view manager code for React Native.",
   "license": "MIT",
   "repository": {
@@ -19,14 +19,14 @@
   ],
   "bugs": "https://github.com/facebook/react-native/issues",
   "engines": {
-    "node": ">=18"
+    "node": ">= 20.19.4"
   },
   "files": [
     "index.js"
   ],
   "dependencies": {
     "@babel/traverse": "^7.25.3",
-    "@react-native/codegen": "0.80.0-main"
+    "@react-native/codegen": "0.81.0-main"
   },
   "devDependencies": {
     "@babel/core": "^7.25.2"

packages/community-cli-plugin/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@react-native/community-cli-plugin",
-  "version": "0.80.0-main",
+  "version": "0.81.0-main",
   "description": "Core CLI commands for React Native",
   "keywords": [
     "react-native",
@@ -22,20 +22,20 @@
     "dist"
   ],
   "dependencies": {
-    "@react-native/dev-middleware": "0.80.0-main",
-    "chalk": "^4.0.0",
+    "@react-native/dev-middleware": "0.81.0-main",
     "debug": "^4.4.0",
     "invariant": "^2.2.4",
-    "metro": "^0.82.2",
-    "metro-config": "^0.82.2",
-    "metro-core": "^0.82.2",
+    "metro": "^0.83.0",
+    "metro-config": "^0.83.0",
+    "metro-core": "^0.83.0",
     "semver": "^7.1.3"
   },
   "devDependencies": {
-    "metro-resolver": "^0.82.2"
+    "metro-resolver": "^0.83.0"
   },
   "peerDependencies": {
-    "@react-native-community/cli": "*"
+    "@react-native-community/cli": "*",
+    "@react-native/metro-config": "*"
   },
   "peerDependenciesMeta": {
     "@react-native-community/cli": {
@@ -43,6 +43,6 @@
     }
   },
   "engines": {
-    "node": ">=18"
+    "node": ">= 20.19.4"
   }
 }

packages/community-cli-plugin/src/commands/bundle/__mocks__/sign.js

@@ -4,11 +4,11 @@
  * 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
- * @oncall react_native
  */
 
-function sign(source) {
+function sign(source: string): string {
   return source;
 }
 

packages/community-cli-plugin/src/commands/bundle/__tests__/filterPlatformAssetScales-test.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import filterPlatformAssetScales from '../filterPlatformAssetScales';

packages/community-cli-plugin/src/commands/bundle/__tests__/getAssetDestPathAndroid-test.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import getAssetDestPathAndroid from '../getAssetDestPathAndroid';

packages/community-cli-plugin/src/commands/bundle/__tests__/getAssetDestPathIOS-test.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import getAssetDestPathIOS from '../getAssetDestPathIOS';

packages/community-cli-plugin/src/commands/bundle/assetCatalogIOS.js

@@ -6,10 +6,9 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
-import type {AssetData} from 'metro/src/Assets';
+import type {AssetData} from 'metro';
 
 import assetPathUtils from './assetPathUtils';
 import fs from 'fs';

packages/community-cli-plugin/src/commands/bundle/assetPathUtils.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 export type PackagerAsset = $ReadOnly<{

packages/community-cli-plugin/src/commands/bundle/buildBundle.js

@@ -6,22 +6,19 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import type {Config} from '@react-native-community/cli-types';
+import type {RunBuildOptions} from 'metro';
 import type {ConfigT} from 'metro-config';
-import type {RequestOptions} from 'metro/src/shared/types.flow';
 
 import loadMetroConfig from '../../utils/loadMetroConfig';
 import parseKeyValueParamArray from '../../utils/parseKeyValueParamArray';
 import saveAssets from './saveAssets';
-import chalk from 'chalk';
 import {promises as fs} from 'fs';
-import Server from 'metro/src/Server';
-import metroBundle from 'metro/src/shared/output/bundle';
-import metroRamBundle from 'metro/src/shared/output/RamBundle';
+import {runBuild} from 'metro';
 import path from 'path';
+import {styleText} from 'util';
 
 export type BundleCommandArgs = {
   assetsDest?: string,
@@ -41,7 +38,7 @@ export type BundleCommandArgs = {
   sourcemapSourcesRoot?: string,
   sourcemapUseAbsolutePath: boolean,
   verbose: boolean,
-  unstableTransformProfile: string,
+  unstableTransformProfile: 'hermes-stable' | 'hermes-canary' | 'default',
   indexedRamBundle?: boolean,
   resolverOption?: Array<string>,
 };
@@ -50,7 +47,7 @@ async function buildBundle(
   _argv: Array<string>,
   ctx: Config,
   args: BundleCommandArgs,
-  bundleImpl: typeof metroBundle | typeof metroRamBundle = metroBundle,
+  bundleImpl?: RunBuildOptions['output'],
 ): Promise<void> {
   const config = await loadMetroConfig(ctx, {
     maxWorkers: args.maxWorkers,
@@ -64,7 +61,7 @@ async function buildBundle(
 async function buildBundleWithConfig(
   args: BundleCommandArgs,
   config: ConfigT,
-  bundleImpl: typeof metroBundle | typeof metroRamBundle = metroBundle,
+  bundleImpl?: RunBuildOptions['output'],
 ): Promise<void> {
   const customResolverOptions = parseKeyValueParamArray(
     args.resolverOption ?? [],
@@ -72,14 +69,14 @@ async function buildBundleWithConfig(
 
   if (config.resolver.platforms.indexOf(args.platform) === -1) {
     console.error(
-      `${chalk.red('error')}: Invalid platform ${
-        args.platform ? `"${chalk.bold(args.platform)}" ` : ''
+      `${styleText('red', 'error')}: Invalid platform ${
+        args.platform ? `"${styleText('bold', args.platform)}" ` : ''
       }selected.`,
     );
 
     console.info(
       `Available platforms are: ${config.resolver.platforms
-        .map(x => `"${chalk.bold(x)}"`)
+        .map(x => `"${styleText('bold', x)}"`)
         .join(
           ', ',
         )}. If you are trying to bundle for an out-of-tree platform, it may not be installed.`,
@@ -97,52 +94,48 @@ async function buildBundleWithConfig(
     sourceMapUrl = path.basename(sourceMapUrl);
   }
 
-  // $FlowIgnore[prop-missing]
-  const requestOpts: RequestOptions & {...} = {
-    entryFile: args.entryFile,
-    sourceMapUrl,
-    dev: args.dev,
-    minify: args.minify !== undefined ? args.minify : !args.dev,
-    platform: args.platform,
-    // $FlowFixMe[incompatible-type] Remove suppression after Metro 0.82.3
-    unstable_transformProfile: args.unstableTransformProfile,
+  const runBuildOptions: RunBuildOptions = {
+    assets: args.assetsDest != null,
+    bundleOut: args.bundleOutput,
     customResolverOptions,
+    dev: args.dev,
+    entry: args.entryFile,
+    minify: args.minify !== undefined ? args.minify : !args.dev,
+    output: bundleImpl,
+    platform: args.platform,
+    sourceMap: args.sourcemapOutput != null,
+    sourceMapOut: args.sourcemapOutput,
+    sourceMapUrl,
+    unstable_transformProfile: args.unstableTransformProfile,
   };
-  const server = new Server(config);
 
-  try {
-    const bundle = await bundleImpl.build(server, requestOpts);
+  // Ensure destination directory exists before running the build
+  await fs.mkdir(path.dirname(args.bundleOutput), {
+    recursive: true,
+    mode: 0o755,
+  });
 
-    // Ensure destination directory exists before saving the bundle
-    await fs.mkdir(path.dirname(args.bundleOutput), {
-      recursive: true,
-      mode: 0o755,
-    });
+  const result = await runBuild(config, runBuildOptions);
 
-    // $FlowIgnore[class-object-subtyping]
-    // $FlowIgnore[incompatible-call]
-    // $FlowIgnore[prop-missing]
-    // $FlowIgnore[incompatible-exact]
-    await bundleImpl.save(bundle, args, console.info);
-
-    // Save the assets of the bundle
-    // $FlowFixMe[prop-missing] Remove suppression after Metro 0.82.3
-    const outputAssets = await server.getAssets({
-      ...Server.DEFAULT_BUNDLE_OPTIONS,
-      ...requestOpts,
-      bundleType: 'todo',
-    });
-
-    // When we're done saving bundle output and the assets, we're done.
-    return await saveAssets(
-      outputAssets,
-      args.platform,
-      args.assetsDest,
-      args.assetCatalogDest,
-    );
-  } finally {
-    await server.end();
+  if (args.assetsDest == null) {
+    console.warn('Warning: Assets destination folder is not set, skipping...');
+    return;
   }
+
+  // Save the assets of the bundle
+  if (result.assets == null) {
+    throw new Error("Assets missing from Metro's runBuild result");
+  }
+
+  const outputAssets = result.assets;
+
+  // When we're done saving bundle output and the assets, we're done.
+  await saveAssets(
+    outputAssets,
+    args.platform,
+    args.assetsDest,
+    args.assetCatalogDest,
+  );
 }
 
 /**

packages/community-cli-plugin/src/commands/bundle/createKeepFileAsync.js

@@ -6,10 +6,9 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
-import type {AssetData} from 'metro/src/Assets';
+import type {AssetData} from 'metro';
 
 import assetPathUtils from './assetPathUtils';
 import fs from 'fs';

packages/community-cli-plugin/src/commands/bundle/filterPlatformAssetScales.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 const ALLOWED_SCALES: {[key: string]: number[]} = {

packages/community-cli-plugin/src/commands/bundle/getAssetDestPathAndroid.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import type {PackagerAsset} from './assetPathUtils';

packages/community-cli-plugin/src/commands/bundle/getAssetDestPathIOS.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import type {PackagerAsset} from './assetPathUtils';

packages/community-cli-plugin/src/commands/bundle/index.js

@@ -6,7 +6,6 @@
  *
  * @flow strict-local
  * @format
- * @oncall react_native
  */
 
 import type {Command} from '@react-native-community/cli-types';