Add a early js script.

assets/js/script-early.js

@@ -0,0 +1,13 @@
+/**
+ * @file
+ * A JavaScript file for the theme. Runs first, before jQuery etc. have loaded.
+ */
+
+(function () {
+
+  'use strict';
+
+  // Add a js class to the html-tag when JavsScript is active.
+  document.querySelector('html').classList.replace('nojs', 'js');
+
+})();

assets/js/script.js

@@ -7,7 +7,6 @@
 
   'use strict';
 
-  // Add a js class to the html-tag when JavsScript is active.
-  $('html').removeClass('nojs').addClass('js');
+  // Place your code here.
 
 })(u);

layouts/partials/scripts.html

@@ -1,3 +1,5 @@
+{{ $early := resources.Get "js/script-early.js" | minify | fingerprint -}}
+<script src="{{ $early.RelPermalink }}"></script>
 {{ if $.Param "jquery" -}}
 {{ $jquery := resources.Get "js/lib/jquery.slim.min.js" | fingerprint -}}
 <script defer src="{{ $jquery.RelPermalink }}"></script>