Habilitando as ferramentas de desenvolvimento novamente

medium-criar-um-projeto-electron-vue-RemovendoWarningsEErros713-index.js

...
let mainWindow
const winURL = process.env.NODE_ENV === 'development'
  ? `http://localhost:9080`
  : `file://${__dirname}/index.html`

function createWindow () {
  /**
   * Initial window options
   */
  mainWindow = new BrowserWindow({
    height: 563,
    useContentSize: true,
    width: 1000,
    webPreferences: {
      nodeIntegration: true,
      nodeIntegrationInWorker: true
    }
  })

  mainWindow.loadURL(winURL)

  // Open dev tools initially when in development mode
  if (process.env.NODE_ENV === 'development') { mainWindow.webContents.once('dom-ready', () => mainWindow.webContents.openDevTools()) }

  mainWindow.on('closed', () => {
    mainWindow = null
  })
}

app.allowRendererProcessReuse = true

app.on('ready', createWindow)

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})
...