fix: add missing method for new arch for backward compatible turbo module

closes #386

Author: satya164

packages/create-react-native-library/templates/objc-library/ios/{%- project.name %}.mm

@@ -4,17 +4,7 @@ @implementation <%- project.name -%>
 
 RCT_EXPORT_MODULE()
 
-<% if (project.arch === 'new') { -%>
-- (NSNumber *)multiply:(double)a b:(double)b {
-<% if (project.cpp) { -%>
-    NSNumber *result = @(<%- project.package_cpp -%>::multiply(a, b));
-<% } else { -%>
-    NSNumber *result = @(a * b);
-<% } -%>
-
-    return result;
-}
-<% } else { -%>
+<% if (project.arch === 'legacy' || project.arch === 'mixed') { -%>
 // Example method
 // See // https://reactnative.dev/docs/native-modules-ios
 RCT_REMAP_METHOD(multiply,
@@ -32,13 +22,33 @@ - (NSNumber *)multiply:(double)a b:(double)b {
 }
 <% } -%>
 
+<% if (project.arch === 'new' || project.arch === 'mixed') { -%>
 // Don't compile this code when we build for the old architecture.
 #ifdef RCT_NEW_ARCH_ENABLED
+<% if (project.arch === 'new') { -%>
+- (NSNumber *)multiply:(double)a b:(double)b {
+<% } else { -%>
+- (void)multiply:(double)a b:(double)b resolve:(RCTPromiseResolveBlock)resolve reject:(RCTPromiseRejectBlock)reject {
+<% } -%>
+<% if (project.cpp) { -%>
+    NSNumber *result = @(<%- project.package_cpp -%>::multiply(a, b));
+<% } else { -%>
+    NSNumber *result = @(a * b);
+<% } -%>
+
+<% if (project.arch === 'new') { -%>
+    return result;
+<% } else { -%>
+    resolve(result);
+<% } -%>
+}
+
 - (std::shared_ptr<facebook::react::TurboModule>)getTurboModule:
     (const facebook::react::ObjCTurboModule::InitParams &)params
 {
     return std::make_shared<facebook::react::Native<%- project.name -%>SpecJSI>(params);
 }
 #endif
+<% } -%>
 
 @end