web/assets/js/data/pv-data.js

const proxyData = '{"url": "{{ site.google_analytics.pv.proxy_endpoint }}"}';

{%- capture pv_data -%}
  {%- if site.google_analytics.pv.cache and site.google_analytics.pv.enabled -%}
    {% include_relative data/_pageviews.json %}
  {%- endif -%}
{%- endcapture -%}

const pageviews = '{{ pv_data }}';