simoncor.net/themes/hugo-coder/layouts/partials/posts/utterances.html

{{- if isset .Site.Params "utterances" -}}
{{- if and (isset .Site.Params.utterances "repo") (not (eq .Site.Params.utterances.repo "" )) (eq (.Params.disableComments | default false) false) -}}
<div class="comments">
  <script>

    let getTheme = window.localStorage && window.localStorage.getItem("colorscheme");
    let themeInParams = '{{$.Site.Params.utterances.theme}}';

    if (getTheme == null) {
      if (themeInParams !== '' && themeInParams !== 'auto') {
        getTheme = themeInParams;
      }
      else {
        getTheme = window.matchMedia('(prefers-color-scheme: dark)').matches ? "dark" : "light";
      }
    }

    let theme = getTheme === 'dark' ? 'github-dark' : 'github-light';
    let s = document.createElement('script');
    s.src = 'https://utteranc.es/client.js';
    s.setAttribute('repo', '{{ .Site.Params.utterances.repo }}');
    s.setAttribute('issue-term', '{{ default "title" .Site.Params.utterances.issueTerm }}');
    s.setAttribute('theme', theme);
    s.setAttribute('crossorigin', 'anonymous');
    s.setAttribute('async', '');
    document.querySelector('div.comments').innerHTML = '';
    document.querySelector('div.comments').appendChild(s);

  </script>
</div>
{{- end -}}
{{- end -}}