cljs.repl.browser/ext->mime-type
(def ext->mime-type
{".html" "text/html"
".css" "text/css"
".ttf" "font/ttf"
".otf" "font/otf"
".pdf" "application/pdf"
".jpg" "image/jpeg"
".png" "image/png"
".gif" "image/gif"
".svg" "image/svg+xml"
".mp4" "video/mp4"
".m4a" "audio/m4a"
".m4v" "video/mp4"
".mp3" "audio/mpeg"
".mpeg" "video/mpeg"
".wav" "audio/wav"
".js" "text/javascript"
".json" "application/json"
".clj" "text/x-clojure"
".cljs" "text/x-clojure"
".cljc" "text/x-clojure"
".edn" "text/x-clojure"
".map" "application/json"
".wasm" "application/wasm"})