From 0e540298ae0636e6eccde2137d021caba034afd3 Mon Sep 17 00:00:00 2001
From: Samuel Susla <samuelsusla@meta.com>
Date: Wed, 19 Feb 2025 05:37:54 -0800
Subject: [PATCH] remove requirement for main queue setup for RCTPlatform
 (#49474)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49474

changelog: [internal]

Can move setup to the background setup:
1. Use RCTTraitCollectionProxy to access current trait collection to check if force touch is available.
2. UIDevice.currentDevice is thread safe and can be read safely from a background thread.

Reviewed By: rshest

Differential Revision: D69744257

fbshipit-source-id: 8857a827c3d3e03a9b2ced15e6970d728693a043
---
 .../React/CoreModules/RCTPlatform.mm          | 40 +++++++++----------
 1 file changed, 19 insertions(+), 21 deletions(-)

diff --git a/packages/react-native/React/CoreModules/RCTPlatform.mm b/packages/react-native/React/CoreModules/RCTPlatform.mm
index ec8a5f3220e..8ae71b13007 100644
--- a/packages/react-native/React/CoreModules/RCTPlatform.mm
+++ b/packages/react-native/React/CoreModules/RCTPlatform.mm
@@ -10,6 +10,7 @@
 #import <UIKit/UIKit.h>
 
 #import <FBReactNativeSpec/FBReactNativeSpec.h>
+#import <React/RCTTraitCollectionProxy.h>
 #import <React/RCTUtils.h>
 #import <React/RCTVersion.h>
 
@@ -48,7 +49,7 @@ RCT_EXPORT_MODULE(PlatformConstants)
 
 + (BOOL)requiresMainQueueSetup
 {
-  return YES;
+  return NO;
 }
 
 - (dispatch_queue_t)methodQueue
@@ -64,30 +65,27 @@ RCT_EXPORT_MODULE(PlatformConstants)
 
 - (ModuleConstants<JS::NativePlatformConstantsIOS::Constants>)getConstants
 {
-  __block ModuleConstants<JS::NativePlatformConstantsIOS::Constants> constants;
-  RCTUnsafeExecuteOnMainQueueSync(^{
-    UIDevice *device = [UIDevice currentDevice];
-    auto versions = RCTGetReactNativeVersion();
-    constants = typedConstants<JS::NativePlatformConstantsIOS::Constants>({
-        .forceTouchAvailable = RCTForceTouchAvailable() ? true : false,
-        .osVersion = [device systemVersion],
-        .systemName = [device systemName],
-        .interfaceIdiom = interfaceIdiom([device userInterfaceIdiom]),
-        .isTesting = RCTRunningInTestEnvironment() ? true : false,
-        .reactNativeVersion = JS::NativePlatformConstantsIOS::ConstantsReactNativeVersion::Builder(
-            {.minor = [versions[@"minor"] doubleValue],
-             .major = [versions[@"major"] doubleValue],
-             .patch = [versions[@"patch"] doubleValue],
-             .prerelease = [versions[@"prerelease"] isKindOfClass:[NSNull class]] ? nullptr : versions[@"prerelease"]}),
+  UIDevice *device = [UIDevice currentDevice];
+  bool isForceTouchAvailable = [RCTTraitCollectionProxy sharedInstance].currentTraitCollection.forceTouchCapability ==
+      UIForceTouchCapabilityAvailable;
+  auto versions = RCTGetReactNativeVersion();
+  return typedConstants<JS::NativePlatformConstantsIOS::Constants>({
+      .forceTouchAvailable = isForceTouchAvailable,
+      .osVersion = [device systemVersion],
+      .systemName = [device systemName],
+      .interfaceIdiom = interfaceIdiom([device userInterfaceIdiom]),
+      .isTesting = RCTRunningInTestEnvironment() ? true : false,
+      .reactNativeVersion = JS::NativePlatformConstantsIOS::ConstantsReactNativeVersion::Builder(
+          {.minor = [versions[@"minor"] doubleValue],
+           .major = [versions[@"major"] doubleValue],
+           .patch = [versions[@"patch"] doubleValue],
+           .prerelease = [versions[@"prerelease"] isKindOfClass:[NSNull class]] ? nullptr : versions[@"prerelease"]}),
 #if TARGET_OS_MACCATALYST
-        .isMacCatalyst = true,
+      .isMacCatalyst = true,
 #else
-        .isMacCatalyst = false,
+      .isMacCatalyst = false,
 #endif
-    });
   });
-
-  return constants;
 }
 
 - (std::shared_ptr<TurboModule>)getTurboModule:(const ObjCTurboModule::InitParams &)params