From d24507611de7fefc71286fd54b2c909d98a4bf27 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Oskar=20Kwas=CC=81niewski?= <oskarkwasniewski@icloud.com>
Date: Tue, 1 Oct 2024 07:59:25 -0700
Subject: [PATCH] feat(iOS): expose RCT_NEW_ARCH_ENABLED to Swift (#46749)

Summary:
This PR exposes `RCT_NEW_ARCH_ENABLED` flag to Swift.

It allows you to use conditional compilation:

```swift
#if RCT_NEW_ARCH_ENABLED
func test() {
	print("I'm running on new arch!)
}
#else
func test() {
	print("I'm running on old arch!)
}
#endif
```

## Changelog:

[IOS] [ADDED] - expose RCT_NEW_ARCH_ENABLED to Swift

Pull Request resolved: https://github.com/facebook/react-native/pull/46749

Test Plan: CI Green

Reviewed By: cortinico

Differential Revision: D63689711

Pulled By: cipolleschi

fbshipit-source-id: 706013019571f597d1966ffcf13bd47ba7f29a2d
---
 packages/react-native/scripts/cocoapods/new_architecture.rb | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/react-native/scripts/cocoapods/new_architecture.rb b/packages/react-native/scripts/cocoapods/new_architecture.rb
index a4e9b720040..079a6aae54f 100644
--- a/packages/react-native/scripts/cocoapods/new_architecture.rb
+++ b/packages/react-native/scripts/cocoapods/new_architecture.rb
@@ -99,6 +99,7 @@ class NewArchitectureHelper
 
 
         ReactNativePodsUtils.add_flag_to_map_with_inheritance(current_config, "OTHER_CPLUSPLUSFLAGS", self.computeFlags(new_arch_enabled))
+        ReactNativePodsUtils.add_flag_to_map_with_inheritance(current_config, "OTHER_SWIFT_FLAGS", new_arch_enabled ? " -DRCT_NEW_ARCH_ENABLED" : "")
 
         spec.dependency "React-RCTFabric" # This is for Fabric Component
         spec.dependency "ReactCodegen"