we're using this lib I wrote a while back on my team https://github.com/yogthos/lein-sass

one caveat is that nashorn is going away, so it won't work with newer versions of the jvm

I should take a look if it's possible to switch to using ringojs instead https://ringojs.org/

actually this looks more promising https://github.com/dynjs/dynjs

actually looks like there is a standalone nashorn on clojars, I added [org.bodil.openjdk/nashorn "0.1.0.2013070801"] and it's working for me with jdk 12/clj 1.10.1

@lady3janepl I pushed out [lein-sass "0.1.10"] , let me know if it works for you