react-native-codegen

import type { TurboModule } from 'react-native'; import type { Int32 } from 'react-native/Libraries/Types/CodegenTypes'; // native_modules/MyNativeModule/NativeMyNativeModule.ts /** * This is the interface for your native module, defining methods and constants. * The codegen tool reads this TypeScript (or Flow) spec file. */ export interface Spec extends TurboModule { /** * Say hello to the native side. * @returns A greeting string from native. */ sayHello(): Promise<string>; /** * Adds two integers on the native side. * @param a The first integer. * @param b The second integer. * @returns The sum of a and b. */ add(a: Int32, b: Int32): Int32; /** * Returns a constant object. */ getConstants(): { DEFAULT_VALUE: string; }; } // Declare the global TurboModule proxy for type safety declare global { var __turboModuleProxy: (moduleName: string) => Spec | null; } // --- To generate native code, run this command in your project root --- // npx react-native codegen-native-modules \ // --platform ios \ // --platform android \ // --project-root . \ // --output-dir ./node_modules/my-native-module/generated // (Note: The --output-dir is illustrative; in a real project, this might be managed by the CLI)