Author here, glad to answer any questions about Jolt.

It's neat!

How does this fit into the ecosystem compared to something like Babashka?

I tried running a cross-platform (JVM, CLR, JS) Clojure project I'm working on, but it failed trying to load the JVM's `System/in`. Does Jolt handle reader conditionals? Is the intention for it to always follow the `:clj` branch or are you planning a `:cljolt` or something?

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micro2588 6 hours ago | parent | prev | next [-]

Awesome work, have you looked into using Racket's fork of Chez? It supports some additional extensions and architectures from base Chez that would seem to beneficial as a compiler target, at least that was the case a couple years ago.

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yogthos 6 hours ago | parent [-]

Thanks, and I have good news on that front actually. I recently factored out a portable Scheme layer and got Jolt to compile against Gambit as a backend. And given that Racket is basically an extension of Chez, it should be trivial to build against it now.

I wrote up a post on how this works here https://yogthos.net/posts/2026-08-07-portable-jolt.html

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micro2588 5 hours ago | parent [-]

Really cool, I see now that most all the the Racket extensions to Chez have been up-streamed which is positive for the health of both projects.

	▲	yogthos 5 hours ago \| parent [-]
		Indeed, it's a nice ecosystem to be part of. :)

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iainctduncan 4 hours ago | parent | prev [-]

Congrats, this is awesome! I have followed your writing and have your book, so was excited to see this was you.

I have one question, can one drop into Scheme the way one can call Java in clojure, or is one totally firewalled from the underlying Scheme implementation?

Great to see Gambit getting love too. Gambit and Chez are amazing achievements.

	▲	yogthos 2 hours ago \| parent [-]
		Hi, thanks, glad to hear you enjoy my other work! :) And yes, you absolutely can drop both down to Scheme and do FFI to drive native libs as well https://jolt-lang.github.io/docs/host-interop.html https://jolt-lang.github.io/docs/native-interop.html I actually leverage this myself in libraries, I ended up writing a Java time layer to support tick here, and I decided to make it a library since I wanted the core executable to stay self contained, and Chez doesn't provide timezone handling natively. So, time pulls in a shared system library and shims a Java style API over it that tick can use https://github.com/jolt-lang/time And I'm doing FFI in Glimmer to provide a Reagent style reactive library on top of GTK https://github.com/jolt-lang/glimmer It ended up working pretty well for a project here https://github.com/yogthos/splat-painter Definitely excited with the progress so far. It's obviously still very fresh, and there are likely bugs and quirks abound, but I find it's already quite usable for my own personal projects.