Import class in definition file (*d.ts)

Question

I want to extend Express Session typings to allow use my custom data in session storage. I have an object req.session.user which is an instance of my class

Answer 1

UPDATE

Since typescript 2.9, you seem to be able to import types into global modules. See the accepted answer for more information.

ORIGINAL ANSWER

I think the problem you're facing is more about augmenting module declarations then class typing.

The exporting is fine, as you'll notice if you try to compile this:

// app.ts  
import { User } from '../models/user'
let theUser = new User('theLogin', 'thePassword')

It seems like you are trying to augment the module declaration of Express, and you are really close. This should do the trick:

// index.d.ts
import { User } from "./models/user";
declare module 'express' {
  interface Session {
    user: User;
    uuid: string;
  }
}

However, the correctness of this code depends of course on the original implementation of the express declaration file.