Currently, templates within a templates.Defer block are not minified.
For example, in the source for https://gohugo.io/:
-
layouts/baseof.html
... {{ with (templates.Defer (dict "key" "global")) }} {{ $t := debug.Timer "tailwindcss" }} {{ with resources.Get "css/styles.css" }} {{ $opts := dict "minify" (not hugo.IsDevelopment) }} {{ with . | css.TailwindCSS $opts }} {{ partial "helpers/linkcss.html" (dict "r" .) }} {{ end }} {{ end }} {{ $t.Stop }} {{ end }} ... -
layouts/_partials/helpers/linkcss.html
{{ $r := .r }} {{ $attr := .attributes | default dict }} {{ if hugo.IsDevelopment }} <link rel="stylesheet" href="{{ $r.RelPermalink }}" {{ template `render-attributes` $attr }}> {{ else }} {{ with $r | minify | fingerprint }} <link rel="stylesheet" href="{{ .RelPermalink }}" integrity="{{ .Data.Integrity }}" crossorigin="anonymous" {{ template `render-attributes` $attr }}> {{ end }} {{ end }} {{ define "render-attributes" }} {{- range $k, $v := . -}} {{- if $v -}} {{- printf ` %s=%q` $k $v | safeHTMLAttr -}} {{- else -}} {{- printf ` %s` $k | safeHTMLAttr -}} {{- end -}} {{- end -}} {{ end }}
Will be rendered without minification (the rest of the output remains unaffected):
Which I think is the expected behaviour, since by definition the function:
Defer execution of a template until after all sites and output formats have been rendered.
But, is there a way to perform minification after defer, or could this be supported in the future (even if it’s not essential)?
Edit: I should also add that while you can use {{- ... -}} to trim whitespace, the template will still be rendered as-is.
For example, code like:
<link rel="stylesheet" href="{{ .RelPermalink }}" integrity="{{ .Data.Integrity }}" crossorigin="anonymous" />
Will not have the trailing slash (/>) removed by the minification process, even though it would be on non-deferred templates.