Hugo - Transpile, tree shake, and minify JavaScript

template.html

{{ with resources.Get "js/main.js" }}
  {{ if eq hugo.Environment "development" }}
    {{ with . | js.Build }}
      <script src="{{ .RelPermalink }}"></script>
    {{ end }}
  {{ else }}
    {{ $opts := dict "minify" true }}
    {{ with . | js.Build $opts | fingerprint }}
      <script src="{{ .RelPermalink }}" integrity="{{ .Data.Integrity }}" crossorigin="anonymous"></script>
    {{ end }}
  {{ end }}
{{ end }}