And then there is Clojure, where you…

write backend with Clojure,

write HTML in Clojure (Hiccup),

write CSS in Clojure (Garden),

write JavaScript in Clojure (ClojureScript),

write ReactJS in Clojure (Reagent/Om),

write something like RxJS in Clojure (re-frame),

write mobile apps in Clojure (re-natal),

write config file in Clojure (EDN).