make getModuleInstanceFromClass: required

Summary:
Changelog: [iOS][Breaking]

continuing getting rid of optional methods, but this does have a behavioral change. if the delegate does not provide the module instance, then we lazily create it. before we were returning nil, idk why. this will be a breaking change if you have any classes that conform to `RCTTurboModuleManagerDelegate`

#saynotoruntimechecks

Reviewed By: cipolleschi

Differential Revision: D45022139

fbshipit-source-id: 9635332caf3db7bb9306f99ee5c0d577091d38ea

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

@@ -24,13 +24,13 @@ RCT_EXTERN void RCTTurboModuleSetBindingMode(facebook::react::TurboModuleBinding
  */
 - (Class)getModuleClassFromName:(const char *)name;
 
-@optional
-
 /**
- * Given a module class, provide an instance for it. If not provided, default initializer is used.
+ * Given a module class, provide an instance for it. If nil is returned, default initializer is used.
  */
 - (id<RCTTurboModule>)getModuleInstanceFromClass:(Class)moduleClass;
 
+@optional
+
 /**
  * Create an instance of a TurboModule without relying on any ObjC++ module instance.
  */

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

@@ -478,27 +478,13 @@ - (TurboModuleHolder *)_getOrCreateTurboModuleHolder:(const char *)moduleName
    */
 
   TurboModulePerfLogger::moduleCreateConstructStart(moduleName, moduleId);
-  if ([_delegate respondsToSelector:@selector(getModuleInstanceFromClass:)]) {
-    if (RCTTurboModuleManagerDelegateLockingDisabled()) {
-      module = [_delegate getModuleInstanceFromClass:moduleClass];
-    } else {
-      std::lock_guard<std::mutex> delegateGuard(_turboModuleManagerDelegateMutex);
-      module = [_delegate getModuleInstanceFromClass:moduleClass];
-    }
-
-    /**
-     * If the application is unable to create the TurboModule object from its class:
-     * abort TurboModule creation, and early return nil.
-     */
-    if (!module) {
-      RCTLogError(
-          @"TurboModuleManager delegate %@ returned nil TurboModule object for module with name=\"%s\" and class=%@",
-          NSStringFromClass([_delegate class]),
-          moduleName,
-          NSStringFromClass(moduleClass));
-      return nil;
-    }
+  if (RCTTurboModuleManagerDelegateLockingDisabled()) {
+    module = [_delegate getModuleInstanceFromClass:moduleClass];
   } else {
+    std::lock_guard<std::mutex> delegateGuard(_turboModuleManagerDelegateMutex);
+    module = [_delegate getModuleInstanceFromClass:moduleClass];
+  }
+  if (!module) {
     module = [moduleClass new];
   }
   TurboModulePerfLogger::moduleCreateConstructEnd(moduleName, moduleId);