In my TypeScript file I have this object:

export const GLOBAL_MESSAGES = {
  USER: {
    EXISTS: 'User already Exists',
    SUCCESSFULLY_REGISTERED: 'User successfully is registered',
  },

  TEST: '123',
}

also in try to create a specific response shape:

export interface UserResponseInterface extends UserInterface {
  message: keyof typeof GLOBAL_MESSAGES.USER;
}

const a: UserResponseInterface = {
  message: GLOBAL_MESSAGES.USER.EXISTS,
  password: 'asd',
};

Expected result: when I type:

  message: GLOBAL_MESSAGES.USER.EXISTS,

I shouldn’t get any TS complaints like now:

TS2322: Type string is not assignable to type
"EXISTS" | "SUCCESSFULLY_REGISTERED"