fix(react-native-host): build fixes for 0.78 (#3488)

Author: tido64

.changeset/breezy-donuts-approve.md

@@ -0,0 +1,5 @@
+---
+"@rnx-kit/react-native-host": patch
+---
+
+Build fixes for 0.78

packages/react-native-host/cocoa/RNXBridgelessHeaders.h

@@ -10,7 +10,10 @@
 #import <ReactCommon/RCTJscInstance.h>
 #endif  // USE_HERMES
 
+#if __has_include(<react/config/ReactNativeConfig.h>)
 #import <react/config/ReactNativeConfig.h>
+#define USE_REACT_NATIVE_CONFIG
+#endif  // __has_include(<react/config/ReactNativeConfig.h>)
 
 #if __has_include(<react/featureflags/ReactNativeFeatureFlags.h>)
 #import <react/featureflags/ReactNativeFeatureFlags.h>

packages/react-native-host/cocoa/ReactNativeHost.mm

@@ -16,7 +16,9 @@
 
 @class RCTSurfacePresenter;
 
+#ifdef USE_REACT_NATIVE_CONFIG
 using ReactNativeConfig = facebook::react::EmptyReactNativeConfig const;
+#endif  // USE_REACT_NATIVE_CONFIG
 
 #if USE_BRIDGELESS
 @interface ReactNativeHost () <RCTContextContainerHandling>
@@ -34,7 +36,9 @@ @implementation ReactNativeHost {
     RCTHost *_reactHost;
     NSLock *_isShuttingDown;
     RNXHostReleaser *_hostReleaser;
+#ifdef USE_REACT_NATIVE_CONFIG
     std::shared_ptr<ReactNativeConfig> _reactNativeConfig;
+#endif  // USE_REACT_NATIVE_CONFIG
 }
 
 - (instancetype)initWithConfig:(id<RNXHostConfig>)config
@@ -197,7 +201,9 @@ - (NSURL *)sourceURLForBridge:(RCTBridge *)bridge
 - (void)didCreateContextContainer:
     (std::shared_ptr<facebook::react::ContextContainer>)contextContainer
 {
+#ifdef USE_REACT_NATIVE_CONFIG
     contextContainer->insert("ReactNativeConfig", _reactNativeConfig);
+#endif  // USE_REACT_NATIVE_CONFIG
 }
 
 #else  // USE_BRIDGELESS
@@ -254,15 +260,21 @@ - (void)initializeReactHost
     RCTEnableTurboModuleInterop(YES);
     RCTEnableTurboModuleInteropBridgeProxy(YES);
 
+#ifdef USE_REACT_NATIVE_CONFIG
     _reactNativeConfig = std::make_shared<ReactNativeConfig>();
     std::weak_ptr<ReactNativeConfig> reactNativeConfig{_reactNativeConfig};
+#endif  // USE_REACT_NATIVE_CONFIG
 
     SharedJSRuntimeFactory (^jsEngineProvider)() = ^SharedJSRuntimeFactory {
 #if USE_HERMES
+#ifdef USE_REACT_NATIVE_CONFIG
       auto config = reactNativeConfig.lock();
       NSAssert(config, @"Expected nonnull ReactNativeConfig instance");
       return std::make_shared<facebook::react::RCTHermesInstance>(config, nullptr);
 #else
+      return std::make_shared<facebook::react::RCTHermesInstance>(nullptr, false);
+#endif  // USE_REACT_NATIVE_CONFIG
+#else  // USE_HERMES
       return std::make_shared<facebook::react::RCTJscInstance>();
 #endif  // USE_HERMES
     };