How to use jsPDF on nodejs server?

I'm trying to implement jsPDF on nodejs (server side) but I found out that jsPDF was made for client side applications. I cannot install node-jspdf since it supports only UNIX systems. I also tried this method but it throws an error

'Error in function Object.: global.open is not a function'

The code I tried is fairly simple.

makepdf.js

global.window = { document: { createElementNS: () => { return {} } } };
global.navigator = {};
global.btoa = () => { };

(function ()
{
    let fs = require('fs');
    var http = require('http');
    var firebase = require("firebase-admin");
    var jsPDF = require('jspdf');

    var serviceAccount = require('./makepdf.json');

    firebase.initializeApp({
        credential: firebase.credential.cert(serviceAccount),
        databaseURL: "https://makepdf-58678.firebaseio.com"
    });

    makeDoc(jsPDF);
}());

function makeDoc(jsPDF)
{
    var doc = new jsPDF();
    doc.text(20, 20, 'This is the default font.')

    doc.setFont('courier')
    doc.setFontType('normal')
    doc.text(20, 30, 'This is courier normal.')

    doc.setFont('times')
    doc.setFontType('italic')
    doc.text(20, 40, 'This is times italic.')
    var data = doc.output('dataurlnewwindow');

    fs.writeFileSync('./document.pdf', data);
}


delete global.window;
delete global.navigator;
delete global.btoa;

via Sanju