main.js

const { app, BrowserWindow } = require("electron");

const init = () => {
	let browserWindow = new BrowserWindow({
		show: true
	});
	let browserWindow2 = new BrowserWindow({
		show: true
	});
	browserWindow.webContents.loadURL("http://www.google.com");
	browserWindow.webContents.printToPDF({})
		.then(() => {
			console.log("success");
		}).catch(() => {
			console.log("failure");
	})
	setTimeout(() => {
		browserWindow.close();
	}, 1500);
	
	browserWindow2.webContents.loadURL("http://www.google.com");
	browserWindow2.webContents.printToPDF({}).then(() => {
		console.log("success");
	}).catch(() => {
		console.log("failure");
	})
};

app.on("ready", () => {
	init();
});

package.json

{
  "main": "main.js",
  "scripts": {
    "start": "electron ."
  },
  "devDependencies": {
    "electron": "14.0.0-beta.24"
  },
  "dependencies": {
  }
}