main.js

// Set PROJ_LIB
const path = require('path');
// Uncomment during debug
//process.env.PROJ_LIB = path.join(__dirname, 'vendor', 'ddb', 'build');
process.env.PROJ_LIB = path.join(__dirname, 'build');

// Modules to control application life and create native browser window
const {app, BrowserWindow} = require('electron');
const { setupMainMenu } = require('./mainmenu');
const fs = require('fs');

// 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: 1000,
    height: 800,
    webPreferences: {
      // nodeIntegration: true,
    //   nodeIntegrationInWorker: true,
      preload: path.join(__dirname, 'preload.js')
    },
    icon: path.join(__dirname, 'images/icon64.png')
  })

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

  if (fs.existsSync(path.join(__dirname, "build.bat"))){
    // Dev environment
    // 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();
    setupMainMenu(app);
});

// 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.