diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
index 052a6d7b192..02ccc266898 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js
@@ -355,16 +355,20 @@ function getFalsyReturnStatementFromReturnType(
 function buildGetConstantsMethod(
   method: NativeModulePropertyShape,
   imports: Set<string>,
+  resolveAlias: AliasResolver,
 ): string {
   const [methodTypeAnnotation] =
     unwrapNullable<NativeModuleFunctionTypeAnnotation>(method.typeAnnotation);
-  if (
-    methodTypeAnnotation.returnTypeAnnotation.type === 'ObjectTypeAnnotation'
-  ) {
+  let returnTypeAnnotation = methodTypeAnnotation.returnTypeAnnotation;
+  if (returnTypeAnnotation.type === 'TypeAliasTypeAnnotation') {
+    // The return type is an alias, resolve it to get the expected undelying object literal type
+    returnTypeAnnotation = resolveAlias(returnTypeAnnotation.name);
+  }
+
+  if (returnTypeAnnotation.type === 'ObjectTypeAnnotation') {
     const requiredProps = [];
     const optionalProps = [];
-    const rawProperties =
-      methodTypeAnnotation.returnTypeAnnotation.properties || [];
+    const rawProperties = returnTypeAnnotation.properties || [];
     rawProperties.forEach(p => {
       if (p.optional || p.typeAnnotation.type === 'NullableTypeAnnotation') {
         optionalProps.push(p.name);
@@ -470,7 +474,7 @@ module.exports = {
 
       const methods = properties.map(method => {
         if (method.name === 'getConstants') {
-          return buildGetConstantsMethod(method, imports);
+          return buildGetConstantsMethod(method, imports, resolveAlias);
         }
 
         const [methodTypeAnnotation] =
diff --git a/packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/serializeMethod.js b/packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/serializeMethod.js
index 32a13879c94..9dcf621c709 100644
--- a/packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/serializeMethod.js
+++ b/packages/react-native-codegen/src/generators/modules/GenerateModuleObjCpp/serializeMethod.js
@@ -459,14 +459,24 @@ function serializeConstantsProtocolMethods(
     );
   }
 
-  const {returnTypeAnnotation} = propertyTypeAnnotation;
+  let {returnTypeAnnotation} = propertyTypeAnnotation;
+
+  if (returnTypeAnnotation.type === 'TypeAliasTypeAnnotation') {
+    // The return type is an alias, resolve it to get the expected undelying object literal type
+    returnTypeAnnotation = resolveAlias(returnTypeAnnotation.name);
+  }
+
   if (returnTypeAnnotation.type !== 'ObjectTypeAnnotation') {
     throw new Error(
-      `${hasteModuleName}.getConstants() may only return an object literal: {...}.`,
+      `${hasteModuleName}.getConstants() may only return an object literal: {...}` +
+        ` or a type alias of such. Got '${propertyTypeAnnotation.returnTypeAnnotation.type}'.`,
     );
   }
 
-  if (returnTypeAnnotation.properties.length === 0) {
+  if (
+    returnTypeAnnotation.type === 'ObjectTypeAnnotation' &&
+    returnTypeAnnotation.properties.length === 0
+  ) {
     return [];
   }