fold RCTInstanceDelegate into RCTHostDelegate (#37245)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/37245

in general, userland has no reason to know about RCTInstance. this is the first step in starting to decouple consumers from the implementation details of bridgeless mode.

Changelog: [Internal]

Reviewed By: RSNara

Differential Revision: D45542678

fbshipit-source-id: e3b3c2ea9a913b2a2329f305aebbb6b0235d2a0e

packages/react-native/ReactCommon/react/bridgeless/platform/ios/Core/RCTHost.h

@@ -38,6 +38,7 @@ RCT_EXTERN NSString *const RCTHostDidReloadNotification;
 
 - (std::shared_ptr<facebook::react::JSEngineInstance>)getJSEngine;
 - (NSURL *)getBundleURL;
+- (std::shared_ptr<facebook::react::ContextContainer>)createContextContainer;
 
 @end
 
@@ -49,7 +50,6 @@ RCT_EXTERN NSString *const RCTHostDidReloadNotification;
 @interface RCTHost : NSObject <ReactInstanceForwarding>
 
 - (instancetype)initWithHostDelegate:(id<RCTHostDelegate>)hostDelegate
-                    instanceDelegate:(id<RCTInstanceDelegate>)instanceDelegate
           turboModuleManagerDelegate:(id<RCTTurboModuleManagerDelegate>)turboModuleManagerDelegate
                  bindingsInstallFunc:(facebook::react::ReactInstance::BindingsInstallFunc)bindingsInstallFunc
                  jsErrorHandlingFunc:(facebook::react::JsErrorHandler::JsErrorHandlingFunc)jsErrorHandlingFunc

packages/react-native/ReactCommon/react/bridgeless/platform/ios/Core/RCTHost.mm

@@ -22,12 +22,11 @@ using namespace facebook::react;
 NSString *const RCTHostWillReloadNotification = @"RCTHostWillReloadNotification";
 NSString *const RCTHostDidReloadNotification = @"RCTHostDidReloadNotification";
 
-@interface RCTHost () <RCTReloadListener>
+@interface RCTHost () <RCTReloadListener, RCTInstanceDelegate>
 @end
 
 @implementation RCTHost {
   RCTInstance *_instance;
-  __weak id<RCTInstanceDelegate> _instanceDelegate;
   __weak id<RCTHostDelegate> _hostDelegate;
   __weak id<RCTTurboModuleManagerDelegate> _turboModuleManagerDelegate;
   NSURL *_oldDelegateBundleURL;
@@ -56,18 +55,12 @@ NSString *const RCTHostDidReloadNotification = @"RCTHostDidReloadNotification";
  has been expressed.
  */
 - (instancetype)initWithHostDelegate:(id<RCTHostDelegate>)hostDelegate
-                    instanceDelegate:(id<RCTInstanceDelegate>)instanceDelegate
           turboModuleManagerDelegate:(id<RCTTurboModuleManagerDelegate>)turboModuleManagerDelegate
                  bindingsInstallFunc:(facebook::react::ReactInstance::BindingsInstallFunc)bindingsInstallFunc
                  jsErrorHandlingFunc:(JsErrorHandler::JsErrorHandlingFunc)jsErrorHandlingFunc;
 {
-  RCTAssert(
-      hostDelegate && instanceDelegate && turboModuleManagerDelegate,
-      @"RCTHost cannot be instantiated with any nil init params.");
-
   if (self = [super init]) {
     _hostDelegate = hostDelegate;
-    _instanceDelegate = instanceDelegate;
     _turboModuleManagerDelegate = turboModuleManagerDelegate;
     _surfaceStartBuffer = [NSMutableArray new];
     _bundleManager = [RCTBundleManager new];
@@ -155,7 +148,7 @@ NSString *const RCTHostDidReloadNotification = @"RCTHostDidReloadNotification";
   }
   [self _refreshBundleURL];
   RCTReloadCommandSetBundleURL(_bundleURL);
-  _instance = [[RCTInstance alloc] initWithDelegate:_instanceDelegate
+  _instance = [[RCTInstance alloc] initWithDelegate:self
                                    jsEngineInstance:[_hostDelegate getJSEngine]
                                       bundleManager:_bundleManager
                          turboModuleManagerDelegate:_turboModuleManagerDelegate
@@ -224,7 +217,7 @@ NSString *const RCTHostDidReloadNotification = @"RCTHostDidReloadNotification";
     _surfaceStartBuffer = [NSMutableArray arrayWithArray:[self _getAttachedSurfaces]];
   }
 
-  _instance = [[RCTInstance alloc] initWithDelegate:_instanceDelegate
+  _instance = [[RCTInstance alloc] initWithDelegate:self
                                    jsEngineInstance:[_hostDelegate getJSEngine]
                                       bundleManager:_bundleManager
                          turboModuleManagerDelegate:_turboModuleManagerDelegate
@@ -264,6 +257,13 @@ NSString *const RCTHostDidReloadNotification = @"RCTHostDidReloadNotification";
   [_instance invalidate];
 }
 
+#pragma mark - RCTInstanceDelegate
+
+- (std::shared_ptr<facebook::react::ContextContainer>)createContextContainer
+{
+  return [_hostDelegate createContextContainer];
+}
+
 #pragma mark - Private
 - (void)_refreshBundleURL FB_OBJC_DIRECT
 {

packages/react-native/ReactCommon/react/bridgeless/platform/ios/Core/RCTInstance.h

@@ -36,8 +36,6 @@ FB_RUNTIME_PROTOCOL
 // TODO (T74233481) - Delete this. Communication between Product Code <> RCTInstance should go through RCTHost.
 @protocol RCTInstanceDelegate <NSObject>
 
-@required
-
 - (std::shared_ptr<facebook::react::ContextContainer>)createContextContainer;
 
 @end