尝试在Typescript中实现Mongoose模型。对Google的调查只揭示了一种混合方法（结合JS和TS）。在没有JS的情况下，如何以我比较幼稚的方式实现User类呢？

希望能够不带行李的IUserModel。

import {IUser} from './user.ts';
import {Document, Schema, Model} from 'mongoose';

// mixing in a couple of interfaces
interface IUserDocument extends IUser,  Document {}

// mongoose, why oh why '[String]' 
// TODO: investigate out why mongoose needs its own data types
let userSchema: Schema = new Schema({
  userName  : String,
  password  : String,
  firstName : String,
  lastName  : String,
  email     : String,
  activated : Boolean,
  roles     : [String]
});

// interface we want to code to?
export interface IUserModel extends Model<IUserDocument> {/* any custom methods here */}

// stumped here
export class User {
  constructor() {}
}