https://en.wikipedia.org/w/api.php?action=parse&oldid=XXXXX&prop=modules|jsconfigvars
doesn't return them
https://en.wikipedia.org/w/api.php?action=query&list=gadgets&gaprop=id%7Cmetadata
does, and I guess filter on "default" and skin "vector" or the empty list? where does that leave "MediaWiki:Gadget-featured-articles-links.css"?