我们应该如何在Typescript中使用猫鼬？

Question

我是打字和表达新手。 我在Microsoft Link的Typescript Starter项目上看到了这段代码，对此代码的工作方式我有些困惑。

例如'type'关键字的作用是什么？ 以及如何在代码中使用'＆'关键字？

import bcrypt from "bcrypt-nodejs";
import crypto from "crypto";
import mongoose from "mongoose";

export type UserDocument = mongoose.Document & {
    email: string;
    password: string;
    passwordResetToken: string;
    passwordResetExpires: Date;

    facebook: string;
    tokens: AuthToken[];

    profile: {
        name: string;
        gender: string;
        location: string;
        website: string;
        picture: string;
    };

    comparePassword: comparePasswordFunction;
    gravatar: (size: number) => string;
};

type comparePasswordFunction = (candidatePassword: string, cb: (err: any, isMatch: any) => {}) => void;

const userSchema = new mongoose.Schema({
    email: { type: String, unique: true },
    password: String,
    passwordResetToken: String,
    passwordResetExpires: Date,

    facebook: String,
    twitter: String,
    google: String,
    tokens: Array,

    profile: {
        name: String,
        gender: String,
        location: String,
        website: String,
        picture: String
    }
}, { timestamps: true });

非常感谢您能解释一下。