electron OSX menu that enables clipboard copy and paste

index.js

//this is a modified electron-forge default main.js file
import { app, BrowserWindow, ipcMain, shell, protocol, dialog, session, clipboard, Menu } from 'electron';
const metastream = require('metastream');
// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;

process.on('uncaughtException', (err) => { console.error(err); });

const createWindow = () => {
  //console.log(app.getPath('userData'));
  // Create the browser window.
  mainWindow = new BrowserWindow({ "fullscreen":true });

  // and load the index.html of the app.
  mainWindow.loadURL(`file://${__dirname}/index.html`);

  // Open the DevTools.
  mainWindow.webContents.openDevTools();

  // Emitted when the window is closed.
  mainWindow.on('closed', () => {
    // Dereference the window object, usually you would store windows
    // in an array if your app supports multi windows, this is the time
    // when you should delete the corresponding element.
    mainWindow = null;
  });

    // Create the Application's main menu
    var arrMenuItems = [{
        label: "Application",
        submenu: [
            { label: "About Application", selector: "orderFrontStandardAboutPanel:" },
            { type: "separator" },
            { label: "Quit", accelerator: "Command+Q", click: function() { app.quit(); }}
        ]}, {
        label: "Edit",
        submenu: [
            { label: "Undo", accelerator: "CmdOrCtrl+Z", selector: "undo:" },
            { label: "Redo", accelerator: "Shift+CmdOrCtrl+Z", selector: "redo:" },
            { type: "separator" },
            { label: "Cut", accelerator: "CmdOrCtrl+X", selector: "cut:" },
            { label: "Copy", accelerator: "CmdOrCtrl+C", selector: "copy:" },
            { label: "Paste", accelerator: "CmdOrCtrl+V", selector: "paste:" },
            { label: "Select All", accelerator: "CmdOrCtrl+A", selector: "selectAll:" }
        ]}
    ];

    Menu.setApplicationMenu(Menu.buildFromTemplate(arrMenuItems));
};

// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on('ready', createWindow);

// Quit when all windows are closed.
app.on('window-all-closed', () => {
  // On OS X it is common for applications and their menu bar
  // to stay active until the user quits explicitly with Cmd + Q
  if (process.platform !== 'darwin') {
    app.quit();
  }
});

app.on('activate', () => {
  // On OS X it's common to re-create a window in the app when the
  // dock icon is clicked and there are no other windows open.
  if (mainWindow === null) {
    createWindow();
  }
});