jsdom-global.js

const jsdom = require("jsdom").jsdom;
const doc = jsdom(undefined, { url: "http://localhost" });
const jsdomWindow = doc.defaultView;

global.document = doc;
global.window = new Proxy(jsdomWindow, {
	set(target, property, value) {
		global[property] = value;
		return value;
	}
});

Object.keys(window).forEach(key => {
	if (!global[key]) {
		global[key] = window[key];
	}
});