Redirection based on popular browsers

redirect.js

const redirect = (urls) => {
  const browser = window.chrome ? 'chrome' : window.safari ? 'safari' : 'firefox'
  const platform = /(chrome|safari|firefox)/i.test(navigator.userAgent) ? 'supported' : 'unsupported'
  const os = /(android|ios|iphone)/i.test(navigator.userAgent) ? 'mobile' : 'desktop'
  const parametrize = (url) => {
    url = new URL(url)
    Array.from(new URL(location.href).searchParams.entries()).forEach(([k, v]) => url.searchParams.set(k, v))
    return url.toString()
  }

  if (platform === 'supported' && os === 'desktop') {
    return parametrize(urls[browser])
  }

  return parametrize(urls[os])
}

/**
 * Usage:
 * 
 * redirect({
 *   chrome: 'chrome-webstore-url',
 *   firefox: 'firefox-webstore-url',
 *   safari: 'safari-webstore-url',
 *   mobile: 'mobile-fallback-url',
 *   desktop: 'desktop-fallback-url',
 * })
 */