I recommend to use sci.async instead of copy-ing nbb's core namespace (since it predates it) https://github.com/babashka/sci/blob/master/doc/async.md

What you could also do is use cherry to https://github.com/squint-cljs/cherry/blob/main/doc/embed.md it in a clojurescript project and then you can use js-await

Well, the sci.async is one aspect right? I actually am more interested in already having all namespaces that nbb have pre-configured, to have the js/ namespace wired, have the require stuff find the right .cljs files, etc

@U3Y18N0UC yes, sci.async was mostly design to make require async (and secondary, to support top level await)

joyride is pretty similar to nbb but doesn't have any async stuff

https://github.com/BetterThanTomorrow/joyride/blob/master/src/joyride/sci.cljs

That already helps a lot, thanks! I don't really need the async stuff for now, everything will be pre-loaded anyway

also check out sci.configs: pre-made configurations to plug in, like for promesa, reagent, etc https://github.com/babashka/sci.configs

wiring up js :

{:classes {'js js/globalThis :allow :all}}