Add optional annotation in serialize step in codegen objective C output

packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/index.js

@@ -32,10 +32,44 @@ const ModuleDeclarationTemplate = ({
   structDeclarations: string,
   eventEmitters: string,
   protocolMethods: string,
-}>) => `${structDeclarations}
+}>) => {
+  // Split methods into required and optional groups
+  const methodLines = protocolMethods.split('\n');
+  const requiredMethods = [];
+  const optionalMethods = [];
+
+  let isOptional = false;
+  for (const line of methodLines) {
+    switch (line.trim()) {
+      case '@optional':
+        isOptional = true;
+        continue;
+      case '@required':
+        isOptional = false;
+        continue;
+      case '':
+        continue;
+      default:
+        if (isOptional) {
+          optionalMethods.push(line);
+        } else {
+          requiredMethods.push(line);
+        }
+    }
+  }
+  let protocolMethodsBody = requiredMethods.join('\n');
+  if (optionalMethods.length > 0) {
+    if (protocolMethodsBody === '') {
+      protocolMethodsBody += optionalMethods.join('\n');
+    } else {
+      protocolMethodsBody += `\n\n@optional\n${optionalMethods.join('\n')}`;
+    }
+  }
+
+  return `${structDeclarations}
 @protocol ${hasteModuleName}Spec <RCTBridgeModule, RCTTurboModule>
 
-${protocolMethods}
+${protocolMethodsBody}
 
 @end
 
@@ -57,6 +91,7 @@ namespace facebook::react {
     ${hasteModuleName}SpecJSI(const ObjCTurboModule::InitParams &params);
   };
 } // namespace facebook::react`;
+};
 
 const HeaderFileTemplate = ({
   headerFileName,

packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/serializeMethod.js

@@ -33,11 +33,16 @@ const ProtocolMethodTemplate = ({
   returnObjCType,
   methodName,
   params,
+  isOptional,
 }: $ReadOnly<{
   returnObjCType: string,
   methodName: string,
   params: string,
-}>) => `- (${returnObjCType})${methodName}${params};`;
+  isOptional: boolean,
+}>) =>
+  `${
+    isOptional ? '@optional\n' : '@required\n'
+  }- (${returnObjCType})${methodName}${params};`;
 
 export type StructParameterRecord = $ReadOnly<{
   paramIndex: number,
@@ -139,6 +144,7 @@ function serializeMethod(
     methodName,
     returnObjCType,
     params: objCParams,
+    isOptional: property.optional === true,
   });
 
   /**
@@ -517,6 +523,7 @@ function serializeConstantsProtocolMethods(
         methodName,
         returnObjCType,
         params: '',
+        isOptional: property.optional === true,
       });
 
       return {

packages/react-native-codegen/src/generators/modules/__tests__/__snapshots__/GenerateModuleHObjCpp-test.js.snap

@@ -207,14 +207,16 @@ namespace JS {
 
 - (NSDictionary *)difficult:(JS::NativeSampleTurboModule::SpecDifficultA &)A;
 - (void)optionals:(JS::NativeSampleTurboModule::SpecOptionalsA &)A;
-- (void)optionalMethod:(NSDictionary *)options
-              callback:(RCTResponseSenderBlock)callback
-                extras:(NSArray *)extras;
 - (void)getArrays:(JS::NativeSampleTurboModule::SpecGetArraysOptions &)options;
 - (NSDictionary * _Nullable)getNullableObject;
 - (NSDictionary * _Nullable)getNullableGenericObject;
 - (NSArray<id<NSObject>> * _Nullable)getNullableArray;
 
+@optional
+- (void)optionalMethod:(NSDictionary *)options
+              callback:(RCTResponseSenderBlock)callback
+                extras:(NSArray *)extras;
+
 @end
 
 @interface NativeSampleTurboModuleSpecBase : NSObject {
@@ -838,10 +840,12 @@ namespace JS {
 - (void)reportSoftException:(NSString *)message
                       stack:(NSArray *)stack
                 exceptionId:(double)exceptionId;
-- (void)reportException:(JS::NativeExceptionsManager::ExceptionData &)data;
 - (void)updateExceptionMessage:(NSString *)message
                          stack:(NSArray *)stack
                    exceptionId:(double)exceptionId;
+
+@optional
+- (void)reportException:(JS::NativeExceptionsManager::ExceptionData &)data;
 - (void)dismissRedbox;
 
 @end