Make +moduleName optional so New Arch modules can drop RCT_EXPORT_MODULE WIP (#58417)

packages/react-native/React/Base/RCTBridge.mm

@@ -177,7 +177,7 @@ void RCTRegisterModule(Class moduleClass)
       cls);
 #endif
 
-  NSString *name = [cls moduleName];
+  NSString *name = [cls respondsToSelector:@selector(moduleName)] ? [cls moduleName] : nil;
   if (name.length == 0) {
     name = NSStringFromClass(cls);
   }

packages/react-native/React/Base/RCTBridgeModule.h

@@ -122,11 +122,12 @@ RCT_EXTERN_C_END
 
 #endif // defined(RCT_REMOVE_LEGACY_MODULE_INTEROP) && defined(RCT_REMOVE_LEGACY_COMPONENT_INTEROP)
 
-// Implemented by RCT_EXPORT_MODULE
-+ (NSString *)moduleName;
-
 @optional
 
+// Implemented by RCT_EXPORT_MODULE. When absent, callers fall back to the ObjC class
+// name, so a TurboModule resolved via a provider or plugin socket need not declare it.
++ (NSString *)moduleName;
+
 /**
  * A reference to the RCTModuleRegistry. Useful for modules that require access
  * to other NativeModules. To implement this in your module, just add `@synthesize

packages/react-native/React/Fabric/Mounting/ComponentViews/LegacyViewManagerInterop/RCTLegacyViewManagerInteropComponentView.mm

@@ -130,9 +130,10 @@ + (BOOL)isSupported:(NSString *)componentName
 
   for (Class moduleClass in registeredModules) {
     id<RCTBridgeModule> bridgeModule = (id<RCTBridgeModule>)moduleClass;
-    NSString *moduleName = [[bridgeModule moduleName] isEqualToString:@""]
+    NSString *exportedName = [bridgeModule respondsToSelector:@selector(moduleName)] ? [bridgeModule moduleName] : nil;
+    NSString *moduleName = exportedName.length == 0
         ? [NSStringFromClass(moduleClass) stringByReplacingOccurrencesOfString:@"Manager" withString:@""]
-        : [bridgeModule moduleName];
+        : exportedName;
 
     if (supportedLegacyViewComponents[moduleName] == NULL) {
       supportedLegacyViewComponents[moduleName] = moduleClass;

packages/react-native/React/Views/RCTComponentData.mm

@@ -544,7 +544,7 @@ - (void)setProps:(NSDictionary<NSString *, id> *)props forView:(id<RCTComponent>
   // We want to get rid of RCT and RK prefixes, but a lot of JS code still references
   // view names by prefix. So, while RCTBridgeModuleNameForClass now drops these
   // prefixes by default, we'll still keep them around here.
-  NSString *name = [managerClass moduleName];
+  NSString *name = [managerClass respondsToSelector:@selector(moduleName)] ? [managerClass moduleName] : nil;
   if (name.length == 0) {
     name = NSStringFromClass(managerClass);
   }

packages/react-native/ReactCommon/react/nativemodule/core/platform/ios/ReactCommon/RCTTurboModuleManager.mm

@@ -763,6 +763,10 @@ - (Class)_getModuleClassFromName:(const char *)moduleName
   NSString *objcModuleName = [NSString stringWithUTF8String:moduleName];
   NSArray<Class> *modules = RCTGetModuleClasses();
   for (Class current in modules) {
+    // A class without +moduleName has no custom JS name, so it can never match here.
+    if (![current respondsToSelector:@selector(moduleName)]) {
+      continue;
+    }
     NSString *currentModuleName = [current moduleName];
     if ([objcModuleName isEqualToString:currentModuleName]) {
       return current;