Hello! When using shadow-cljs, would passing --config-merge on compile be a good place to give environment variables? e.g: building for production doing a --config-merge '{:closure-define { secretkey "s1234"}

yes, that is what it was made for

although you shouldn't put "secrets" into your build ever, in JS nothing is "secret"

but in general yes, config merge or #shadow/env work for this

Awesome, thank you!