window.OS = (() => {
  const ua = navigator.userAgent
  const isWindowsPhone = /(?:Windows Phone)/.test(ua)
  const isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone
  const isAndroid = /(?:Android)/.test(ua)
  const isFireFox = /(?:Firefox)/.test(ua)
  const isChrome = /(?:Chrome|CriOS)/.test(ua)
  const isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid && !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua))
  const isPhone = /(?:iPhone)/.test(ua) && !isTablet
  const isPc = !isPhone && !isAndroid && !isSymbian
  return {
    isTablet,
    isPhone,
    isAndroid,
    isPc,
    isChrome
  }
})()