main.js

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

const Store = require('electron-store');
Store.initRenderer();

function createWindow () {
  // Create the browser window.
  const mainWindow = new BrowserWindow({
    width: 1400,
    height: 700,
    minWidth: 750,
    minHeight: 700,
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false,
      preload: path.join(__dirname, 'preload.js'),
      enableRemoteModule: true
    }
  })

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

  // Open the DevTools.
  mainWindow.webContents.openDevTools()
  mainWindow.setMenu(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.whenReady().then(() => {
  createWindow()
  
  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 (BrowserWindow.getAllWindows().length === 0) createWindow()
  })
  app.allowRendererProcessReuse = false
})

// Quit when all windows are closed, except on macOS. There, it's common
// for applications and their menu bar to stay active until the user quits
// explicitly with Cmd + Q.
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') 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.
ipcMain.on('getUsbPorts', (_event, _arg) => {
  let ports = [];
  SerialPort.list().then(function(_ports){
    for (const key in _ports) {
      const port = _ports[key];
      if (port.vendorId) {
        ports.push(port)
      }
    }
    _event.sender.send('getUsbPorts', ports)
  });
})