Clojurescript is nice a option too, you get a language with better defaults and you don't have to pull in immutablejs/lodash or you favourite immutable and util

Clojurescript is nice a option too, you get a language with better defaults and you don't have to pull in immutablejs/lodash or you favourite immutable and util library and deal between all the inconsistency between them. All the ES6/7/8 stuff is there too plus other niceties.