Glad you got it working, and yeah it is just standard reader conditionals. I've also look for .jolt files which get preference over .clj, so it's possible to add Jolt specific behavior which overrides existing behavior in a library.

And it's a bit different from Babashka in providing easy access to Scheme and native libraries. And the code compiles to a standalone native binary. So, you can make a native GTK app for example.

The other big difference is performance. Babashka is an interpreter, but Jolt compiles the code. So, performance is close to the JVM in most cases.