UserDetails component consuming a centralized PropType

UserDetails.js

import React from 'react';
import {userType} from './types';

function User({ user }) {
  return (
    <div>
      <h1>{user.firstName} {user.lastName}</h1>
    </div>
  )
}

User.propTypes = {
  user: userType.isRequired
};

export default User;