The script is interpreted by SCI, an interpreter for Clojure and ClojureScript. The goal of nbb is to expose useful scripting tools from both the NodeJs ecosyst

The script is interpreted by SCI, an interpreter for Clojure and ClojureScript. The goal of nbb is to expose useful scripting tools from both the NodeJs ecosystem and the CLJS ecosystem from within a single tool, so you can avoid ceremony if you want to write scripts using CLJS on NodeJS.