reducer

reducer.ts

import authReducer, { AuthStateInterface } from '../components/auth/authReducer';

// Interface inside my reducer file
// export interface AuthStateInterface {
//   authenticated?: string | null;
// }
export interface IAppState {
  //... Other state you need here
  auth: AuthStateInterface;
}

const rootReducer = combineReducers<IAppState>({
  auth: authReducer,
});

export default rootReducer;