Issue with createCookie it returns undefined as if it cannot find the file cookies.json.

linkedin.data.service.ts

/**
 * Created by Davide Pugliese on 26/02/17.
 */
import { Observable } from "rxjs/Observable";
import "rxjs/add/observable/from";

let request = require('request');
import { userObservable } from "./user.service";
import {first} from "rxjs/operator/first";
import {last} from "rxjs/operator/last";
import * as path from 'path';
let FileCookieStore = require('tough-cookie-filestore');
// let csrfLogin = require('csrf-login');
const fs = require('fs');
const Promise = require('promise');
let readFile = Promise.denodeify(require('fs').readFile);
const efs = require('extfs');


class LinkedinDataService {


    constructor() {
    }


    getCookie = function () {

        efs.isEmpty(path.join(__dirname, '..', '../dist/cookies/cookies.json'), function (empty) {
            //this is executed only if the file is empty, this avoids having the same file written multiple times
            //hence a file that contains invalid JSON.
            if (empty) {
                let j = request.jar(new FileCookieStore(path.join(__dirname, '..', '../dist/cookies/cookies.json')));
                request = request.defaults({ jar : j });
                console.log(empty);
                return request('https://www.linkedin.com', function() {
                    request('https://www.linkedin.com/uas/login-submit');

                });
           }

        });

    };

    createCookieObject (callback) {
        callback();

        return readFile(path.join(__dirname, '..', '../dist/cookies/cookies.json'), 'utf8')
            .then(JSON.parse).nodeify(callback);
    }


    getData<T>(firstname:string, lastname: string)  {

        // console.log('First Name ' + firstname + ' \nLast Name ' + lastname);


        // NOTE - currently the 'cookies.json' file must already exist!

        // let j = request.jar(new FileCookieStore(path.join(__dirname, '..', '../dist/cookies/cookies.json')));
        // request = request.defaults({ jar : j });
        // request('http://www.google.com', function() {
        //     request('http://images.google.com');
        // });




        let createCookie = this.createCookieObject(() => {
             this.getCookie();
            }
        );

        Observable.from(createCookie);

        return userObservable.subscribe(
            (x) => JSON.stringify(x)
        );




    }

}


export  { LinkedinDataService };