refactor(iOS): include resources like bundles into the precompiled XCFrameworks

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

@@ -157,6 +157,22 @@ jobs:
           pattern: prebuild-ios-core-headers-${{ matrix.flavor }}-*
           path: packages/react-native/.build/headers
           merge-multiple: true
+      - name: Download ReactNativeDependencies
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        uses: actions/download-artifact@v7
+        with:
+          name: ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz
+          path: /tmp/third-party/
+      - name: Extract ReactNativeDependencies
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        shell: bash
+        run: |
+          # ReactNativeHeaders.xcframework (built by the compose step) folds in
+          # the third-party deps namespaces (folly/glog/boost/...), so the deps
+          # headers must be staged here too — not just in build-slices.
+          tar -xzf /tmp/third-party/ReactNativeDependencies${{ matrix.flavor }}.xcframework.tar.gz -C /tmp/third-party/
+          mkdir -p packages/react-native/third-party/
+          mv /tmp/third-party/packages/react-native/third-party/ReactNativeDependencies.xcframework packages/react-native/third-party/ReactNativeDependencies.xcframework
       - name: Setup Keychain
         if: ${{ steps.restore-ios-xcframework.outputs.cache-hit != 'true' && env.REACT_ORG_CODE_SIGNING_P12_CERT != '' }}
         uses: apple-actions/import-codesign-certs@v3 # https://github.com/marketplace/actions/import-code-signing-certificates
@@ -173,11 +189,24 @@ jobs:
         run: |
           cd packages/react-native
           node scripts/ios-prebuild -c -f "${{ matrix.flavor }}" -i "React Org"
+      - name: Verify composed headers
+        if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
+        run: |
+          # Generator-time header gate: include-health ratchet, structural
+          # byte-compare of module maps/umbrellas against the spec render, and
+          # compile smokes (React module + every namespace module + the
+          # privileged-consumer/Expo fixtures). Catches consumer-facing header
+          # regressions here instead of in downstream builds.
+          cd packages/react-native
+          node scripts/ios-prebuild/headers-verify.js --flavor "${{ matrix.flavor }}"
       - name: Compress and Rename XCFramework
         if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
         run: |
           cd packages/react-native/.build/output/xcframeworks/${{matrix.flavor}}
-          tar -cz -f ../ReactCore${{matrix.flavor}}.xcframework.tar.gz React.xcframework
+          # Ship BOTH xcframeworks: React-Core-prebuilt's prepare_command flattens
+          # ReactNativeHeaders.xcframework's Headers (incl. module.modulemap) into the
+          # pod. Omitting it leaves consumers without React-Core-prebuilt/Headers/module.modulemap.
+          tar -cz -f ../ReactCore${{matrix.flavor}}.xcframework.tar.gz React.xcframework ReactNativeHeaders.xcframework
       - name: Compress and Rename dSYM
         if: steps.restore-ios-xcframework.outputs.cache-hit != 'true'
         run: |

packages/react-native/React-Core-prebuilt.podspec

@@ -17,36 +17,60 @@ Pod::Spec.new do |s|
   s.author                 = "Meta Platforms, Inc. and its affiliates"
   s.platforms              = min_supported_versions
   s.source                 = source
+
+  # We vend two xcframeworks that ship together in the prebuilt tarball:
+  #  - React.xcframework: the compiled core. Its per-slice React.framework carries
+  #    every <React/...> header + the framework module map, so `#import <React/...>`
+  #    and `@import React;` resolve through FRAMEWORK_SEARCH_PATHS automatically.
+  #  - ReactNativeHeaders.xcframework: headers-only. Carries every other namespace
+  #    (<react/...>, <yoga/...>, folly, glog, ...). Its headers are flattened into a
+  #    top-level Headers/ (see prepare_command) and exposed via the standard pod
+  #    header search path. (<hermes/...> is supplied by the hermes-engine pod here;
+  #    it is folded into ReactNativeHeaders only on the SwiftPM consumer side.)
+  # There is no clang VFS overlay.
   s.vendored_frameworks    = "React.xcframework"
 
   s.preserve_paths       = '**/*.*'
-  s.header_mappings_dir  = 'React.xcframework/Headers'
-  s.source_files         = 'React.xcframework/Headers/**/*.{h,hpp}'
-
-  s.module_name          = 'React'
-  s.module_map           = 'React.xcframework/Modules/module.modulemap'
-  s.public_header_files  = 'React.xcframework/Headers/**/*.h'
+  s.header_mappings_dir  = 'Headers'
+  s.source_files         = 'Headers/**/*.{h,hpp}'
+  s.public_header_files  = 'Headers/**/*.h'
 
   add_rn_third_party_dependencies(s)
 
-  # We need to make sure that the React.xcframework is copied correctly - in the downloaded tarball
-  # the root directory is the framework, but when using it we need to have it in a subdirectory
-  # called React.xcframework, so we need to move the contents of the tarball into that directory.
-  # This is done in the prepare_command.
-  # We need to make sure that the headers are copied to the right place - local tar.gz has a different structure
-  # than the one from the maven repo
+  # The downloaded tarball ships React.xcframework and ReactNativeHeaders.xcframework
+  # at its root. We make sure React.xcframework is in its own subdirectory (the Maven
+  # tarball lays the framework contents at the root; the local tar.gz has a different
+  # structure) and flatten ReactNativeHeaders' headers into a top-level Headers/ dir
+  # so CocoaPods exposes them on the header search path.
   s.prepare_command = <<~'CMD'
     CURRENT_PATH=$(pwd)
     XCFRAMEWORK_PATH="${CURRENT_PATH}/React.xcframework"
 
-    # Check if XCFRAMEWORK_PATH is empty
-    if [ -z "$XCFRAMEWORK_PATH" ]; then
-      echo "ERROR: XCFRAMEWORK_PATH is empty."
-      exit 0
+    # Flatten ReactNativeHeaders' headers (identical across slices) into Headers/
+    # BEFORE we sweep stray root entries into React.xcframework. Fail closed:
+    # a tarball without ReactNativeHeaders.xcframework (an artifact published
+    # before the headers-spec layout, or a truncated download) would otherwise
+    # yield a green install with an empty Headers/ and every <react/...> or
+    # <yoga/...> include failing much later, far from the cause.
+    mkdir -p Headers
+    RNH_XCFRAMEWORK_PATH=$(find "$CURRENT_PATH" -type d -name "ReactNativeHeaders.xcframework" | head -n 1)
+    if [ -z "$RNH_XCFRAMEWORK_PATH" ]; then
+      echo "[React-Core-prebuilt] ERROR: ReactNativeHeaders.xcframework not found in the prebuilt tarball." >&2
+      echo "The artifact predates the headers-spec layout or is incomplete; use a matching react-native version." >&2
+      exit 1
+    fi
+    RNH_HEADERS_PATH=$(find "$RNH_XCFRAMEWORK_PATH" -type d -name "Headers" | head -n 1)
+    if [ -z "$RNH_HEADERS_PATH" ]; then
+      echo "[React-Core-prebuilt] ERROR: no Headers directory inside $RNH_XCFRAMEWORK_PATH." >&2
+      exit 1
     fi
+    cp -R "$RNH_HEADERS_PATH/." Headers
+    rm -rf "$RNH_XCFRAMEWORK_PATH"
 
     mkdir -p "${XCFRAMEWORK_PATH}"
-    find "$CURRENT_PATH" -mindepth 1 -maxdepth 1 ! -name "$(basename "$XCFRAMEWORK_PATH")" -exec mv {} "$XCFRAMEWORK_PATH" \;
+    find "$CURRENT_PATH" -mindepth 1 -maxdepth 1 \
+      ! -name "$(basename "$XCFRAMEWORK_PATH")" ! -name "Headers" \
+      -exec mv {} "$XCFRAMEWORK_PATH" \;
   CMD
 
   # If we are passing a local tarball, we don't want to switch between Debug and Release

packages/react-native/React-Core.podspec

@@ -51,7 +51,6 @@ Pod::Spec.new do |s|
   s.author                 = "Meta Platforms, Inc. and its affiliates"
   s.platforms              = min_supported_versions
   s.source                 = source
-  s.resource_bundle        = { "RCTI18nStrings" => ["React/I18n/strings/*.lproj"]}
   s.compiler_flags         = js_engine_flags()
   s.header_dir             = "React"
   s.weak_framework         = "JavaScriptCore"
@@ -122,7 +121,15 @@ Pod::Spec.new do |s|
     s.dependency "React-hermes"
   end
 
-  s.resource_bundles = {'React-Core_privacy' => 'React/Resources/PrivacyInfo.xcprivacy'}
+  # Both bundles in one declaration: a second `resource_bundle(s) =` would replace
+  # (not merge) the first. RCTI18nStrings holds React-Core's localized strings
+  # (loaded by RCTLocalizedString); React-Core_privacy is the privacy manifest.
+  # (Prebuilt/SwiftPM get both from inside React.xcframework instead — see
+  # scripts/ios-prebuild/framework-resources.js — but source builds ship them here.)
+  s.resource_bundles = {
+    'RCTI18nStrings' => ['React/I18n/strings/*.lproj'],
+    'React-Core_privacy' => 'React/Resources/PrivacyInfo.xcprivacy',
+  }
 
   add_dependency(s, "React-runtimeexecutor", :additional_framework_paths => ["platform/ios"])
   add_dependency(s, "React-jsinspector", :framework_name => 'jsinspector_modern')

packages/react-native/React/I18n/RCTLocalizedString.mm

@@ -9,6 +9,29 @@
 
 #if !defined(WITH_FBI18N) || !(WITH_FBI18N)
 
+// Anchors resource lookups to the bundle that contains this code: React.framework
+// when React Native is consumed prebuilt / via SwiftPM, or the app's main bundle
+// for static source builds.
+@interface RCTI18nStringsAnchor : NSObject
+@end
+@implementation RCTI18nStringsAnchor
+@end
+
+// Resolves RCTI18nStrings.bundle wherever it ships: the code's own bundle first
+// (prebuilt/SwiftPM embed it inside React.framework), then the app's main bundle
+// (source builds copy it there via the podspec resource_bundles). Returns nil
+// when absent, so the caller falls back to the untranslated default value.
+static NSBundle *RCTI18nStringsBundle(void)
+{
+  NSBundle *codeBundle = [NSBundle bundleForClass:[RCTI18nStringsAnchor class]];
+  NSURL *url = [codeBundle URLForResource:@"RCTI18nStrings" withExtension:@"bundle"];
+  if (url != nil) {
+    return [NSBundle bundleWithURL:url];
+  }
+  NSString *mainPath = [[NSBundle mainBundle] pathForResource:@"RCTI18nStrings" ofType:@"bundle"];
+  return mainPath != nil ? [NSBundle bundleWithPath:mainPath] : nil;
+}
+
 extern "C" {
 
 static NSString *FBTStringByConvertingIntegerToBase64(uint64_t number)
@@ -33,8 +56,7 @@
 
 NSString *RCTLocalizedStringFromKey(uint64_t key, NSString *defaultValue)
 {
-  static NSBundle *bundle = [NSBundle bundleWithPath:[[NSBundle mainBundle] pathForResource:@"RCTI18nStrings"
-                                                                                     ofType:@"bundle"]];
+  static NSBundle *bundle = RCTI18nStringsBundle();
   if (bundle == nil) {
     return defaultValue;
   } else {

packages/react-native/scripts/cocoapods/fabric.rb

@@ -11,7 +11,7 @@ def setup_fabric!(react_native_path: "../node_modules/react-native")
     pod 'React-Fabric', :path => "#{react_native_path}/ReactCommon"
     pod 'React-FabricComponents', :path => "#{react_native_path}/ReactCommon"
     pod 'React-graphics', :path => "#{react_native_path}/ReactCommon/react/renderer/graphics"
-    pod 'React-RCTFabric', :path => "#{react_native_path}/React", :modular_headers => true
+    rncore_pod 'React-RCTFabric', :path => "#{react_native_path}/React", :modular_headers => true
     pod 'React-ImageManager', :path => "#{react_native_path}/ReactCommon/react/renderer/imagemanager/platform/ios"
     pod 'React-FabricImage', :path => "#{react_native_path}/ReactCommon"
 end