facebook · arushikesarwani94 · Nov 14, 2025
diff --git a/packages/react-native-codegen/src/CodegenSchema.d.ts b/packages/react-native-codegen/src/CodegenSchema.d.ts
@@ -34,14 +34,52 @@ export interface Int32TypeAnnotation {
   readonly type: 'Int32TypeAnnotation';
 }
 
+export interface NumberLiteralTypeAnnotation {
+  readonly type: 'NumberLiteralTypeAnnotation';
+  readonly value: number;
+}
+
 export interface StringTypeAnnotation {
   readonly type: 'StringTypeAnnotation';
 }
 
+export interface NumberTypeAnnotation {
+  readonly type: 'NumberTypeAnnotation';
+}
+
+export interface StringLiteralTypeAnnotation {
+  readonly type: 'StringLiteralTypeAnnotation';
+  readonly value: string;
+}
+
+export interface BooleanLiteralTypeAnnotation {
+  readonly type: 'BooleanLiteralTypeAnnotation';
+  readonly value: boolean;
+}
+
+export interface UnionTypeAnnotation<T> {
+  readonly type: 'UnionTypeAnnotation';
+  readonly types: readonly T[];
+}
+
+export type StringLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<StringLiteralTypeAnnotation>;
+
+export type NumberLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<NumberLiteralTypeAnnotation>;
+
+export type BooleanLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<BooleanLiteralTypeAnnotation>;
+
 export interface VoidTypeAnnotation {
   readonly type: 'VoidTypeAnnotation';
 }
 
+export interface TupleTypeAnnotation {
+  readonly type: 'TupleTypeAnnotation';
+  readonly types: StringLiteralTypeAnnotation | NumberLiteralTypeAnnotation;
+}
+
 export interface ObjectTypeAnnotation<T> {
   readonly type: 'ObjectTypeAnnotation';
   readonly properties: readonly NamedShape<T>[];
@@ -304,10 +342,6 @@ export interface NativeModuleStringLiteralTypeAnnotation {
   readonly value: string;
 }
 
-export interface StringLiteralUnionTypeAnnotation {
-  readonly type: 'StringLiteralUnionTypeAnnotation';
-  readonly types: NativeModuleStringLiteralTypeAnnotation[];
-}
 
 export interface NativeModuleNumberTypeAnnotation {
   readonly type: 'NumberTypeAnnotation';
@@ -369,14 +403,18 @@ export interface NativeModulePromiseTypeAnnotation {
   readonly elementType: Nullable<NativeModuleBaseTypeAnnotation> | VoidTypeAnnotation;
 }
 
-export type UnionTypeAnnotationMemberType =
-  | 'NumberTypeAnnotation'
-  | 'ObjectTypeAnnotation'
-  | 'StringTypeAnnotation';
+export type NativeModuleUnionTypeAnnotationMemberType =
+  | NativeModuleObjectTypeAnnotation
+  | StringLiteralTypeAnnotation
+  | NumberLiteralTypeAnnotation
+  | BooleanLiteralTypeAnnotation
+  | BooleanTypeAnnotation
+  | StringTypeAnnotation
+  | NumberTypeAnnotation;
 
 export interface NativeModuleUnionTypeAnnotation {
   readonly type: 'UnionTypeAnnotation';
-  readonly memberType: UnionTypeAnnotationMemberType;
+  readonly memberType: NativeModuleUnionTypeAnnotationMemberType;
 }
 
 export interface NativeModuleMixedTypeAnnotation {

diff --git a/packages/react-native-codegen/src/CodegenSchema.js b/packages/react-native-codegen/src/CodegenSchema.js
@@ -47,16 +47,29 @@ export type StringTypeAnnotation = $ReadOnly<{
   type: 'StringTypeAnnotation',
 }>;
 
+export type NumberTypeAnnotation = $ReadOnly<{
+  type: 'NumberTypeAnnotation',
+}>;
+
 export type StringLiteralTypeAnnotation = $ReadOnly<{
   type: 'StringLiteralTypeAnnotation',
   value: string,
 }>;
 
-export type StringLiteralUnionTypeAnnotation = $ReadOnly<{
-  type: 'StringLiteralUnionTypeAnnotation',
-  types: $ReadOnlyArray<StringLiteralTypeAnnotation>,
+export type BooleanLiteralTypeAnnotation = $ReadOnly<{
+  type: 'BooleanLiteralTypeAnnotation',
+  value: boolean,
 }>;
 
+export type StringLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<StringLiteralTypeAnnotation>;
+
+export type NumberLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<NumberLiteralTypeAnnotation>;
+
+export type BooleanLiteralUnionTypeAnnotation =
+  UnionTypeAnnotation<BooleanLiteralTypeAnnotation>;
+
 export type VoidTypeAnnotation = $ReadOnly<{
   type: 'VoidTypeAnnotation',
 }>;
@@ -68,6 +81,16 @@ export type ObjectTypeAnnotation<+T> = $ReadOnly<{
   baseTypes?: $ReadOnlyArray<string>,
 }>;
 
+export type UnionTypeAnnotation<+T> = $ReadOnly<{
+  type: 'UnionTypeAnnotation',
+  types: $ReadOnlyArray<T>,
+}>;
+
+export type TupleTypeAnnotation = $ReadOnly<{
+  type: 'TupleTypeAnnotation',
+  types: StringLiteralTypeAnnotation | NumberLiteralTypeAnnotation,
+}>;
+
 export type MixedTypeAnnotation = $ReadOnly<{
   type: 'MixedTypeAnnotation',
 }>;
@@ -358,15 +381,17 @@ export type NativeModulePromiseTypeAnnotation = $ReadOnly<{
   elementType: VoidTypeAnnotation | Nullable<NativeModuleBaseTypeAnnotation>,
 }>;
 
-export type UnionTypeAnnotationMemberType =
-  | 'NumberTypeAnnotation'
-  | 'ObjectTypeAnnotation'
-  | 'StringTypeAnnotation';
+export type NativeModuleUnionTypeAnnotationMemberType =
+  | NativeModuleObjectTypeAnnotation
+  | StringLiteralTypeAnnotation
+  | NumberLiteralTypeAnnotation
+  | BooleanLiteralTypeAnnotation
+  | BooleanTypeAnnotation
+  | StringTypeAnnotation
+  | NumberTypeAnnotation;
 
-export type NativeModuleUnionTypeAnnotation = $ReadOnly<{
-  type: 'UnionTypeAnnotation',
-  memberType: UnionTypeAnnotationMemberType,
-}>;
+export type NativeModuleUnionTypeAnnotation =
+  UnionTypeAnnotation<NativeModuleUnionTypeAnnotationMemberType>;
 
 export type NativeModuleMixedTypeAnnotation = $ReadOnly<{
   type: 'MixedTypeAnnotation',
@@ -396,6 +421,7 @@ export type NativeModuleBaseTypeAnnotation =
   | StringLiteralUnionTypeAnnotation
   | NativeModuleNumberTypeAnnotation
   | NumberLiteralTypeAnnotation
+  | BooleanLiteralTypeAnnotation
   | Int32TypeAnnotation
   | DoubleTypeAnnotation
   | FloatTypeAnnotation

diff --git a/packages/react-native-codegen/src/generators/components/CppHelpers.js b/packages/react-native-codegen/src/generators/components/CppHelpers.js
@@ -12,11 +12,23 @@
 import type {
   EventTypeAnnotation,
   NamedShape,
+  NativeModuleUnionTypeAnnotation,
   PropTypeAnnotation,
 } from '../../CodegenSchema';
 
 const {getEnumName, toSafeCppString} = require('../Utils');
 
+const NumberTypes = ['NumberTypeAnnotation', 'NumberLiteralTypeAnnotation'];
+const StringTypes = ['StringTypeAnnotation', 'StringLiteralTypeAnnotation'];
+const ObjectTypes = ['ObjectTypeAnnotation'];
+const BooleanTypes = ['BooleanTypeAnnotation', 'BooleanLiteralTypeAnnotation'];
+const ValidTypes = [
+  ...NumberTypes,
+  ...ObjectTypes,
+  ...StringTypes,
+  ...BooleanTypes,
+];
+
 function toIntEnumValueName(propName: string, value: number): string {
   return `${toSafeCppString(propName)}${value}`;
 }
@@ -61,7 +73,47 @@ function getCppArrayTypeForAnnotation(
     case 'Int32TypeAnnotation':
     case 'MixedTypeAnnotation':
       return `std::vector<${getCppTypeForAnnotation(typeElement.type)}>`;
-    case 'StringLiteralUnionTypeAnnotation':
+    case 'UnionTypeAnnotation':
+      const union: NativeModuleUnionTypeAnnotation = typeElement;
+      const isUnionOfType = (types: $ReadOnlyArray<string>): boolean => {
+        return union.types.every(memberTypeAnnotation =>
+          types.includes(memberTypeAnnotation.type),
+        );
+      };
+
+      if (isUnionOfType(NumberTypes)) {
+        return `std::vector<${getCppTypeForAnnotation('DoubleTypeAnnotation')}>`;
+      }
+
+      if (isUnionOfType(ObjectTypes)) {
+        if (!structParts) {
+          throw new Error(
+            `Trying to generate the event emitter for an Array of ${typeElement.type} without informations to generate the generic type`,
+          );
+        }
+        return `std::vector<${generateEventStructName(structParts)}>`;
+      }
+
+      if (isUnionOfType(StringTypes)) {
+        if (!structParts) {
+          throw new Error(
+            `Trying to generate the event emitter for an Array of ${typeElement.type} without informations to generate the generic type`,
+          );
+        }
+        return `std::vector<${generateEventStructName(structParts)}>`;
+      }
+
+      if (isUnionOfType(BooleanTypes)) {
+        return `std::vector<${getCppTypeForAnnotation('BooleanTypeAnnotation')}>`;
+      }
+
+      const invalidTypes = union.types.filter(member => {
+        return !ValidTypes.includes(member.type);
+      });
+
+      throw new Error(
+        `Unsupported union member types: ${invalidTypes.join(', ')}"`,
+      );
     case 'ObjectTypeAnnotation':
       if (!structParts) {
         throw new Error(

diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterCpp.js
@@ -207,7 +207,7 @@ function handleArrayElementType(
         loopLocalVariable,
         val => `jsi::valueFromDynamic(runtime, ${val})`,
       );
-    case 'StringLiteralUnionTypeAnnotation':
+    case 'UnionTypeAnnotation':
       return setValueAtIndex(
         propertyName,
         indexVariable,
@@ -320,7 +320,7 @@ function generateSetters(
             usingEvent,
             prop => `jsi::valueFromDynamic(runtime, ${prop})`,
           );
-        case 'StringLiteralUnionTypeAnnotation':
+        case 'UnionTypeAnnotation':
           return generateSetter(
             parentPropertyName,
             eventProperty.name,

diff --git a/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js b/packages/react-native-codegen/src/generators/components/GenerateEventEmitterH.js
@@ -128,7 +128,7 @@ function getNativeTypeFromAnnotation(
     case 'FloatTypeAnnotation':
     case 'MixedTypeAnnotation':
       return getCppTypeForAnnotation(type);
-    case 'StringLiteralUnionTypeAnnotation':
+    case 'UnionTypeAnnotation':
     case 'ObjectTypeAnnotation':
       return generateEventStructName([...nameParts, eventProperty.name]);
     case 'ArrayTypeAnnotation':
@@ -188,7 +188,7 @@ function handleGenerateStructForArray(
       nameParts.concat([name]),
       nullthrows(elementType.properties),
     );
-  } else if (elementType.type === 'StringLiteralUnionTypeAnnotation') {
+  } else if (elementType.type === 'UnionTypeAnnotation') {
     generateEnum(
       structs,
       elementType.types.map(literal => literal.value),
@@ -251,7 +251,7 @@ function generateStruct(
           nullthrows(typeAnnotation.properties),
         );
         return;
-      case 'StringLiteralUnionTypeAnnotation':
+      case 'UnionTypeAnnotation':
         generateEnum(
           structs,
           typeAnnotation.types.map(literal => literal.value),

diff --git a/packages/react-native-codegen/src/generators/components/__test_fixtures__/fixtures.js b/packages/react-native-codegen/src/generators/components/__test_fixtures__/fixtures.js
@@ -1273,7 +1273,7 @@ const EVENT_PROPS: SchemaType = {
                       typeAnnotation: {
                         type: 'ArrayTypeAnnotation',
                         elementType: {
-                          type: 'StringLiteralUnionTypeAnnotation',
+                          type: 'UnionTypeAnnotation',
                           types: [
                             {
                               type: 'StringLiteralTypeAnnotation',
@@ -1383,7 +1383,7 @@ const EVENT_PROPS: SchemaType = {
                       name: 'orientation',
                       optional: false,
                       typeAnnotation: {
-                        type: 'StringLiteralUnionTypeAnnotation',
+                        type: 'UnionTypeAnnotation',
                         types: [
                           {
                             type: 'StringLiteralTypeAnnotation',