classes and interfaces to write typed Models and schemas of Mongoose in Typescript using definitelytyped

This is how I do this:

1. Define TypeScript class which will define our logic.
2. Define the interface (which I name Document): that's the type mongoose will interact with
3. Define the model (we'll be able to find, insert, update...)

In code:

import { Document, Schema, model } from 'mongoose'// 1) CLASSexport class User {  name: string  mail: string  constructor(data: {    mail: string    name: string  }) {    this.mail = data.mail    this.name = data.name  }    /* any method would be defined here*/  foo(): string {     return this.name.toUpperCase() // whatever  }}// no necessary to export the schema (keep it private to the module)var schema = new Schema({  mail: { required: true, type: String },  name: { required: false, type: String }})// register each method at schemaschema.method('foo', User.prototype.foo)// 2) Documentexport interface UserDocument extends User, Document { }// 3) MODELexport const Users = model<UserDocument>('User', schema)

How would I use this? let's imagine that code is stored in user.ts, now you'd be able to do the following:

import { User, UserDocument, Users } from 'user'let myUser = new User({ name: 'a', mail: 'aaa@aaa.com' })Users.create(myUser, (err: any, doc: UserDocument) => {   if (err) { ... }   console.log(doc._id) // id at DB   console.log(doc.name) // a   doc.foo() // works :)})