main.js

const { app, BrowserWindow, ipcMain } = require('electron')
const path = require('path')

function createWindow () {
  const win = new BrowserWindow({
    minWidth:  450,
    minHeight: 500,
    frame:   false,
    webPreferences: {
      nodeIntegration: true,
      contextIsolation: false,
      preload: path.join(__dirname, 'preload.js')
    }
  })
  win.loadFile('index.html')
}

app.whenReady().then(() => {
  createWindow()

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow()
    }
  })
})

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

ipcMain.on('fechar', (event) => {
  event.sender.send('fecharOk')
})

// ipcMain.on('minimizar', (event) => {
//   event.sender.send('minimizarOk')
// })