react-native code-gen > Add a C++ only TurboModule example (for Android/iOS/macOS/Windows) (#35138)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/35138

Changelog:

[General][Added] - Add a C++ only TurboModule example (for Android/iOS/macOS/Windows)

react-native@0.69 introduced a new bridging layer to ease integration for pure C++ TurboModules using C++ std:: types directly instead of the lower level jsi:: types:
https://github.com/facebook/react-native/tree/v0.69.0/ReactCommon/react/bridging

This bridging layer can be used in JSI functions or more conveniently in C++ TurboModules.

Here is a example of an C++ only TurboModule which will work on Android and iOS and macOS/Windows (using microsoft/react-native-macos|windows) only using flow/TypeScript and standard C++ types.

C++ only TurboModules are very handy as they do not require to work with JSI APIs - instead std:: or custom C++ can by used.

Reviewed By: javache

Differential Revision: D39011736

fbshipit-source-id: 84c833d8540671fde8505f1aeb0265074b248730

packages/rn-tester/NativeCxxModuleExample/NativeCxxModuleExample.podspec

@@ -0,0 +1,31 @@
+# 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.
+
+require "json"
+
+package = JSON.parse(File.read(File.join(__dir__, "../package.json")))
+
+Pod::Spec.new do |s|
+  s.name            = "NativeCxxModuleExample"
+  s.version         = package["version"]
+  s.summary         = package["description"]
+  s.description     = "NativeCxxModuleExample"
+  s.homepage        = "https://github.com/facebook/react-native.git"
+  s.license         = "MIT"
+  s.platforms       = { :ios => "12.4" }
+  s.compiler_flags  = '-Wno-nullability-completeness'
+  s.author          = "Meta Platforms, Inc. and its affiliates"
+  s.source          = { :git => "https://github.com/facebook/react-native.git", :tag => "#{s.version}" }
+  s.source_files    = "**/*.{h,cpp}"
+  s.requires_arc    = true
+  s.pod_target_xcconfig = {
+    "USE_HEADERMAP" => "YES",
+    "CLANG_CXX_LANGUAGE_STANDARD" => "c++17"
+  }
+
+  install_modules_dependencies(s)
+
+  s.dependency "ReactCommon/turbomodule/core"
+end