UPDATE: Jspdf now support nodejs so should be able to import jspdf without having to add the browser globals as outlined in this answer.

You can actually use jspdf directly (npm install jspdf instead of npm install node-jspdf). Jspdf is currently (v1.3.2) not built with node support in mind, but you can mock the globals like below and get it to work that way. This is a basic example and all features of jspdf will not be available.

global.window = {document: {createElementNS: () => {return {}} }};
global.navigator = {};
global.html2pdf = {};
global.btoa = () => {};

var fs = require('fs');
var jsPDF = require('jspdf');

var doc = new jsPDF();
doc.text("Hello", 10, 10);
var data = doc.output();

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

delete global.window;
delete global.html2pdf;
delete global.navigator;
delete global.btoa;