>
>
> My question is, is this necessary? If it's on the classpath, why must I 
> specifically tell it what namespaces I'm going to use? [...]
>

The ClojureScript compiler looks for *.cljs files to compile as 
ClojureScript.  Hence, at a minimum, the *.clj files that you want to also 
use from ClojureScript need to be copied (or perhaps symlinked, but that's 
not what lein-cljsbuild does) to *.cljs files.

A list of namespaces to copy is necessary because not all valid Clojure 
code is valid ClojureScript code.  There are some fairly substantial 
differences, and trying to interpret certain Clojure forms as ClojureScript 
will cause compiler crashes.

[...] This can't scale well if I need to use dozens of namespaces, some of 
> which will reference other namespaces and etc.


The standard solution here is to just organize all the crossover code into 
one namespace.  For instance, if you have mycrossover.foo, mycrossover.bar, 
and mycrossover.bar.baz namespaces, you can use them all with :crossovers 
[mycrossover].

If you don't like the way crossovers work, you might want to look into 
cljx: https://github.com/lynaghk/cljx .

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