index.js

const electron = require('electron')
const app = electron.app
const BrowserWindow = electron.BrowserWindow
const path = require('path')
const url = require('url')
let mainWindow

require('electron-context-menu')({
	prepend: (params, browserWindow) => [{
		label: '',
		visible: params.mediaType === 'image'
	}]
});

function createWindow () {
  mainWindow = new BrowserWindow({
  	webPreferences: {
      nodeIntegration: true,
    },
  	width: 800,
  	height: 520,
  	frame: false
  });
  mainWindow.loadURL(url.format({
    pathname: path.join(__dirname, 'index.html'),
    protocol: 'file:',
    slashes: true
  }))
  mainWindow.on('closed', function () {
    mainWindow = null
  })
}
app.on('ready', createWindow)
app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') {
    app.quit()
  }
})

app.on('activate', function () {
  if (mainWindow === null) {
    createWindow()
  }
})