index.js

const { app, BrowserWindow, Menu, ipcMain } = require("electron");
const path = require("path");
const url = require("url");
var downloadsSaved = false;
// 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 win;

function createWindow() {
  // Create the browser window.
  win = new BrowserWindow({
    width: 550,
    height: 700,
    icon: __dirname + "/assets/images/build/icon.png",
    resizable: false,
    webPreferences: {
      nodeIntegration: true
    }
  });
  // and load the index.html of the app.
  win.loadURL(
    url.format({
      pathname: path.join(__dirname, "index.html"),
      protocol: "file:",
      slashes: true
    })
  );

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

  win.on("close", event => {
    if (!downloadsSaved) {
      event.preventDefault();
      win.webContents.send("saveDownloads");
    }
  });

  // Emitted when the window is closed.
  win.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.
    win = null;
  });

  const template = [
    {
      label: "Edit",
      submenu: [
        { role: "undo" },
        { role: "redo" },
        { type: "separator" },
        { role: "cut" },
        { role: "copy" },
        { role: "paste" },
        { role: "pasteandmatchstyle" },
        { role: "delete" },
        { role: "selectall" }
      ]
    }
  ];

  if (process.platform === "darwin") {
    template.unshift({
      label: app.getName(),
      submenu: [
        { role: "about" },
        { type: "separator" },
        { role: "services", submenu: [] },
        { type: "separator" },
        { role: "hide" },
        { role: "hideothers" },
        { role: "unhide" },
        { type: "separator" },
        { role: "quit" }
      ]
    });

    template[1].submenu.push(
      { type: "separator" },
      {
        label: "Speech",
        submenu: [{ role: "startspeaking" }, { role: "stopspeaking" }]
      }
    );
  }
  Menu.setApplicationMenu(Menu.buildFromTemplate(template));
}

// 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", () => {
  app.quit();
});

app.on("activate", () => {
  // On macOS 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 (win === null) {
    createWindow();
  }
});

ipcMain.on("quitApp", function() {
  downloadsSaved = true;
  app.quit();
});

// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.