resources/js: Add option for setting bundle format

Fixes #7503

content/en/hugo-pipes/js.md

@@ -45,6 +45,11 @@ defines [map]
 {{ $defines := dict "process.env.NODE_ENV" `"development"` }}
 ```
 
+format [string] {{< new-in "0.75.0" >}}
+: The output format.
+  One of: `iife`, `cjs`, `esm`.
+  Default is `iife`, a self-executing function, suitable for inclusion as a <script> tag. 
+
 ### Examples
 
 ```go-html-template