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node_modules/expo/ios/AppDelegates/ExpoReactNativeFactory.mm

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+// Copyright 2025-present 650 Industries. All rights reserved.
+
+#import <Expo/ExpoReactNativeFactory.h>
+
+#import <ExpoModulesCore/ExpoModulesCore.h>
+#import <ExpoModulesCore/EXRuntime.h>
+#if __has_include(<ExpoModulesCore/ExpoModulesCore-Swift.h>)
+#import <ExpoModulesCore/ExpoModulesCore-Swift.h>
+#else
+#import "ExpoModulesCore-Swift.h"
+#endif
+#import <ReactCommon/RCTHost.h>
+
+@implementation EXReactNativeFactory {
+  EXAppContext *_appContext;
+}
+
+#pragma mark - RCTHostDelegate
+
+// [main thread]
+- (void)hostDidStart:(nonnull RCTHost *)host
+{
+  // Setting the runtime delegate here doesn't feel right, but there is no other way
+  // to capture the `host:didInitializeRuntime:` method call.
+  // With the current API design we also depend that the runtime is initialized after the host started,
+  // which isn't obvious, especially they are invoked on different threads.
+  // Ideally if the current `RCTHostRuntimeDelegate` is part of `RCTHostDelegate`.
+  host.runtimeDelegate = self;
+}
+
+#pragma mark - RCTHostRuntimeDelegate
+
+// [JS thread]
+- (void)host:(nonnull RCTHost *)host didInitializeRuntime:(jsi::Runtime &)runtime
+{
+  _appContext = [[EXAppContext alloc] init];
+
+  // Inject and decorate the `global.expo` object
+  _appContext._runtime = [[EXRuntime alloc] initWithRuntime:runtime];
+  [_appContext setHostWrapper:[[EXHostWrapper alloc] initWithHost:host]];
+
+  [_appContext registerNativeModules];
+}
+
+@end