@theojs/lumen/composables/googleAnalytics.ts

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declare const dataLayer: any[]
declare const gtag: (...args: any[]) => void
declare global {
  interface Window {
    dataLayer?: typeof dataLayer
    gtag?: typeof gtag
  }
}

function mountGoogleAnalytics(id: string) {
  if (window.dataLayer && window.gtag) return

  const gtagScript = document.createElement('script')
  gtagScript.src = `https://www.googletagmanager.com/gtag/js?id=${id}`
  gtagScript.async = true
  document.head.appendChild(gtagScript)
  window.dataLayer = window.dataLayer || []
  window.gtag = function () {
    dataLayer.push(arguments)
  }
  gtag('js', new Date())
  gtag('config', id)
}
export default ({ id }: { id: string }) => {
  if (process.env.NODE_ENV === 'production' && id && typeof window !== 'undefined') mountGoogleAnalytics(id)
}