electron-vite-react/src/main/index.ts

import { join } from 'path'
import { app, BrowserWindow } from 'electron'

app.disableHardwareAcceleration()

if (!app.requestSingleInstanceLock()) {
  app.quit()
  process.exit(0)
}

let win: BrowserWindow | null = null

async function mainWin() {
  win = new BrowserWindow({
    title: 'Main window',
    webPreferences: {
      preload: join(__dirname, '../preload/index.cjs')
    },
  })

  if (app.isPackaged) {
    win.loadFile(join(__dirname, '../renderer/index.html'))
  } else {
    const pkg = await import('../../package.json')
    const url = `http://${pkg.env.HOST || '127.0.0.1'}:${pkg.env.PORT}`

    win.loadURL(url)
    win.maximize()
  }
}

app.whenReady().then(mainWin)

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

app.on('second-instance', () => {
  if (win) {
    // someone tried to run a second instance, we should focus our window.
    if (win.isMinimized()) win.restore()
    win.focus()
  }
})