electron-starter.js

// Modules to control application life and create native browser window
const { app, BrowserWindow } = require("electron");
const url = require("url");
const path = require("path");

// 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;

async function installExtensions() {
  const installer = require("electron-devtools-installer");
  const forceDownload = !!process.env.UPGRADE_EXTENSIONS;
  const extensions = ["REACT_DEVELOPER_TOOLS", "REDUX_DEVTOOLS"];

  return Promise.all(
    extensions.map((name) => installer.default(installer[name], forceDownload))
  ).catch(console.log);
}

async function createWindow() {
  // Create the browser window.
  mainWindow = new BrowserWindow({ width: 800, height: 600 });

  if (process.env.ELECTRON_START_URL) {
    await installExtensions();
    mainWindow.openDevTools();
  }
  // and load the index.html of the app.
  const startUrl =
    process.env.ELECTRON_START_URL ||
    url.format({
      pathname: path.join(__dirname, "/../build/index.html"),
      protocol: "file:",
      slashes: true
    });
  mainWindow.loadURL(startUrl);

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

  // Emitted when the window is closed.
  mainWindow.on("closed", function() {
    // 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;
  });
}

// 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", function() {
  // On macOS 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", function() {
  // 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 (mainWindow === null) {
    createWindow();
  }
});

// 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.