{% assign pwafile = site.static_files | where: "path", "/pwabuilder-sw.js" %}
{% assign offlinefile = site.static_files | where: "path", "/offline.html" %}
{% if file.size != 0 && offlinefile.size != 0 %}
  <script defer type="module">
    import 'https://cdn.jsdelivr.net/npm/@pwabuilder/pwaupdate';
    const el = document.createElement('pwa-update');
    document.body.appendChild(el);
  </script>
{% endif %}