{% if jekyll.environment == 'production' and site.production_google_analytics %}
{%- assign GA_ID = site.production_google_analytics -%}
<script async src="https://www.googletagmanager.com/gtag/js?id={{ GA_ID }}"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag() { dataLayer.push(arguments); }
  gtag('js', new Date());

  gtag('config', '{{ GA_ID }}');
</script>
{% endif %}

{% if jekyll.environment == 'development' and site.development_google_analytics %}
{%- assign GA_ID = site.development_google_analytics -%}
<script async src="https://www.googletagmanager.com/gtag/js?id={{ GA_ID }}"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', '{{ GA_ID }}');
</script>
{% endif %}