main.js

// handle squirrel events for Windows
const setupEvents = require("./installers/setupEvents");
if (setupEvents.handleSquirrelEvent()) {
  return;
}

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

const stateHandler = require("./state-handler.js");

// 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;

function createWindow() {
  // Create the browser window.
  mainWindow = new BrowserWindow({
    width: 1280,
    height: 860,
    icon: __dirname + "/64x64.png",
    webPreferences: {
      nodeIntegration: true,
      preload: __dirname + "/preload.js"
    }
  });

  // and load the index.html of the app.
  mainWindow.loadFile("index.html");

  // 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", () => {
  loadSessionData();
  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.