demonstrate code improvements

express_item.js

import * as request from "superagent";

export class TokenExtractMiddleware {

    constructor() {

    }

    extract = (req, res, next) => {
        const url = `${process.env.AUTH_SERVICE}/auth/authenticate`;
        request
            .post(url)
            .send(req.headers)
            .end((err, authRes) => {
                if (authRes.body.token) {
                    req.token = authRes.body.token;
                    req.decodedToken = authRes.body.decodedToken;
                }
                next();
            });
    };

}

//export const authMiddleware = new AuthenticationMiddleware().authenticateCall