implement express controller class with typescript

Question

I\'m doing an express app with typescript. The router code is:

let user = new User();
router.get(\"/\", user.test);

the user class is

Answer 1

You need to use the bind function to keep the scope of this when the method is invoked:

let user = new User();
router.get("/", user.test.bind(user));

Or you can do that in the User constructor:

export class User {
    constructor() {
        this.test = this.test.bind(this);
    }

    test(req, res, next) {
        ...
    }
}

Another option is to use an arrow function:

let user = new User();
router.get("/", (req, res, next) => user.test(req, res, next));