launcher/app/main/windows/application.js

const {　BrowserWindow } = require('electron')
const { createWindow } = require('./lib/common')

// props: { id: 'TIS_APP_TEMPLATE_KT', entry: '' }
const create = props => {
  const windows = BrowserWindow.getAllWindows()
  const found = windows.find(w => w[props.id])
  if (found) {
    found.show()
    found.center()
    return found
  }

  const win = createWindow(props.entry, {
    show: true
  })
  win[props.id] = true

  return win
}

module.exports = { create }