squirrel.js

const app = require('electron').app

if (handleSquirrelEvent()) {
  return
}

function handleSquirrelEvent() {
  if (process.argv.length === 1) {
    return false
  }

  const ChildProcess = require('child_process')
  const path = require('path')
  const appFolder = path.resolve(process.execPath, '..')
  const rootAtomFolder = path.resolve(appFolder, '..')
  const updateDotExe = path.resolve(path.join(rootAtomFolder, 'Update.exe'))
  const exeName = path.basename(process.execPath)

  const spawn = function(command, args) {
    let spawnedProcess, error

    try {
      spawnedProcess = ChildProcess.spawn(command, args, {detached: true})
    } catch (error) {}

    return spawnedProcess
  }

  const spawnUpdate = function(args) {
    return spawn(updateDotExe, args)
  }

  const squirrelEvent = process.argv[1]
  switch (squirrelEvent) {
    case '--squirrel-install':
    case '--squirrel-updated':
      // Install desktop and start menu shortcuts
      spawnUpdate(['--createShortcut', exeName])
      setTimeout(app.quit, 1000)
      return true

    case '--squirrel-uninstall':
      // Remove desktop and start menu shortcuts
      spawnUpdate(['--removeShortcut', exeName])
      setTimeout(app.quit, 1000)
      return true

    case '--squirrel-obsolete':
      app.quit()
      return true
  }
}