Cover react/renderer/debug with Stable API guards

Summary:
Classifies `react/renderer/debug:debug` as a public target under the three-tier C++ stable API visibility model, and adds the module umbrella `<React/RendererDebug.h>` as its public entry point. Consumers that opt into `RN_STRICT_API` now get an error if they include the module's headers directly and have to go through the umbrella instead; without that flag the guards are inert, so no existing build changes behaviour.

The pod's source glob is narrowed to the module's own directory so the umbrella is not also flattened into `react/renderer/debug`, and the matching `headers-config.js` exception splits the pod into module and umbrella subspecs so `<React/RendererDebug.h>` resolves in the SwiftPM prebuild.

Changelog: [Internal]

Differential Revision: D117850084

Author: j-piasecki

packages/react-native/ReactAndroid/build.gradle.kts

@@ -146,6 +146,7 @@ val preparePrefab by
                       Pair("../ReactCommon/react/debug/", "react/debug/"),
                       // react_renderer_debug
                       Pair("../ReactCommon/react/renderer/debug/", "react/renderer/debug/"),
+                      Pair("../ReactCommon/react/renderer/debug/React/", "React/"),
                       // react_renderer_graphics
                       Pair("../ReactCommon/react/renderer/graphics/", "react/renderer/graphics/"),
                       Pair("../ReactCommon/react/renderer/graphics/platform/android/", ""),

packages/react-native/ReactCommon/react/renderer/debug/CMakeLists.txt

@@ -12,7 +12,7 @@ file(GLOB react_renderer_debug_SRC CONFIGURE_DEPENDS *.cpp)
 add_library(react_renderer_debug OBJECT ${react_renderer_debug_SRC})
 
 target_include_directories(react_renderer_debug PUBLIC ${REACT_COMMON_DIR})
-target_link_libraries(react_renderer_debug folly_runtime react_debug)
+target_link_libraries(react_renderer_debug folly_runtime react_cxxstableapi react_debug)
 target_compile_reactnative_options(react_renderer_debug PRIVATE)
 target_compile_options(react_renderer_debug PRIVATE -Wpedantic)
 

packages/react-native/ReactCommon/react/renderer/debug/DebugStringConvertible.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/UmbrellaGuard.h>
+
 #include <climits>
 #include <memory>
 #include <optional>

packages/react-native/ReactCommon/react/renderer/debug/DebugStringConvertibleItem.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/UmbrellaGuard.h>
+
 #include <string>
 
 #include <react/renderer/debug/DebugStringConvertible.h>

packages/react-native/ReactCommon/react/renderer/debug/React-rendererdebug.podspec

@@ -31,9 +31,8 @@ Pod::Spec.new do |s|
   s.author                 = "Meta Platforms, Inc. and its affiliates"
   s.platforms              = min_supported_versions
   s.source                 = source
-  s.source_files           = podspec_sources("**/*.{cpp,h,mm}", "**/*.h")
+  s.source_files           = podspec_sources("*.{cpp,h,mm}", "*.h")
   s.header_dir             = "react/renderer/debug"
-  s.exclude_files          = "tests"
   s.pod_target_xcconfig    = {
     "CLANG_CXX_LANGUAGE_STANDARD" => rct_cxx_language_standard(),
     "HEADER_SEARCH_PATHS" => header_search_paths.join(' '),
@@ -46,5 +45,13 @@ Pod::Spec.new do |s|
   add_rn_third_party_dependencies(s)
   add_rncore_dependency(s)
 
+  s.dependency "React-cxxstableapi"
+
+  s.subspec "debugUmbrella" do |ss|
+    ss.source_files        = "React/*.h"
+    ss.header_dir          = "React"
+    ss.header_mappings_dir = "React"
+  end
+
   mark_as_react_native_build(s)
 end

packages/react-native/ReactCommon/react/renderer/debug/React/RendererDebug.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#pragma once
+
+// =============================================================================
+// Umbrella header for the `react/renderer/debug` module - public entry point.
+//
+//   #include <React/RendererDebug.h>
+//
+// Re-exports the module's public interface headers. React Native's own code
+// should keep using the fine-grained `<react/renderer/debug/...>` includes;
+// only outside consumers use this umbrella.
+// =============================================================================
+
+// Marks that the following headers are pulled in through the umbrella, so their
+// shared guard (<react/cxxstableapi/UmbrellaGuard.h>) accepts them. Scoped to
+// this block so later *direct* includes in the same TU are still caught.
+#define RN_UMBRELLA_CONTEXT
+
+#include <react/renderer/debug/DebugStringConvertible.h>
+#include <react/renderer/debug/DebugStringConvertibleItem.h>
+#include <react/renderer/debug/debugStringConvertibleUtils.h>
+#include <react/renderer/debug/flags.h>
+
+#undef RN_UMBRELLA_CONTEXT

packages/react-native/ReactCommon/react/renderer/debug/debugStringConvertibleUtils.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/UmbrellaGuard.h>
+
 #include <memory>
 #include <optional>
 #include <string>

packages/react-native/ReactCommon/react/renderer/debug/flags.h

@@ -7,6 +7,8 @@
 
 #pragma once
 
+#include <react/cxxstableapi/UmbrellaGuard.h>
+
 #include <react/debug/flags.h>
 
 //

packages/react-native/scripts/ios-prebuild/headers-config.js

@@ -597,6 +597,23 @@ const PodspecExceptions /*: {[key: string]: PodSpecConfiguration} */ = {
   'Libraries/PushNotificationIOS/React-RCTPushNotification.podspec': {
     disabled: true,
   },
+  'ReactCommon/react/renderer/debug/React-rendererdebug.podspec': {
+    name: 'React-rendererdebug',
+    headerPatterns: [],
+    headerDir: '',
+    subSpecs: [
+      {
+        name: 'debug',
+        headerPatterns: ['*.h'],
+        headerDir: 'react/renderer/debug',
+      },
+      {
+        name: 'debugUmbrella',
+        headerPatterns: ['React/*.h'],
+        headerDir: 'React',
+      },
+    ],
+  },
 };
 
 module.exports = {PodspecExceptions};