electron-updater with confirm dialog

updater-slash-index.js

// usage
// in main:
// import { checkForUpdates } from './updater'
// app.whenReady().then(() => {
// ...
// checkForUpdates()
// createWindow()
// ...
// }
// you may need to adjust the getMainWindow function depending on your app 

import { app, dialog, ipcMain } from 'electron'
import { autoUpdater } from 'electron-updater'

let dialogShown = false

autoUpdater.autoDownload = false
autoUpdater.autoInstallOnAppQuit = false

ipcMain.handle('showUpdateMessage', showUpdateMessage)

function showUpdateMessage(message) {
  getMainWindow().webContents.send('showUpdateMessage', message)
}

function confirmUpdate(info) {
  const options = {
    type: 'question',
    title: 'imageconverter2 update available',
    message: `Update to version ${info.version} ?`,
    detail: `current version: ${app.getVersion()}`,
    buttons: ['no', 'yes'],
    cancelId: 0
  }
  dialog.showMessageBox(getMainWindow(), options)
  .then((result) => {
    dialogShown = true
    if (result.response === 0) return    
    autoUpdater.autoDownload = true
    autoUpdater.on('update-available', (info) => {
      console.log('updating...')
    })
    autoUpdater.checkForUpdates()
  })
}

export function checkForUpdates() {
  if (app.isPackaged) {
    autoUpdater.checkForUpdates()
    autoUpdater.on('update-available', (info) => {
      showUpdateMessage(`${app.name} ${app.getVersion()}<br/>update available: ${info.version}`)
      if(!dialogShown) confirmUpdate(info)
    })
    autoUpdater.on('update-not-available', (info) => {
      showUpdateMessage(`${app.name} ${app.getVersion()}`)
    })
    autoUpdater.on('update-downloaded', (info) => {
      showUpdateMessage(`version ${info.version} downloaded.`)
      autoUpdater.quitAndInstall()
    })
  }
}

function getMainWindow() {
  const allWindows = BrowserWindow.getAllWindows()
  const win = allWindows[allWindows.length - 1]
  return win
}