types.js

export const SET_USER_TOKEN = 'SET_USER_TOKEN';

export interface SetUserTokenAction {
  type: typeof SET_USER_TOKEN;
  payload: string;
}

export type UserActionTypes =
  | SetUserTokenAction
  | ActionB // other action
  | ActionC; // other action

export interface User {
  id: number | null;
  name: string;
  email: string;
}