I'm trying to write some code (to run at compilation time) that will only 
do a require if a library is present. Initially I thought of trying 
something like this:

(defmacro include-if-present []
  (when (io/resource "foo/bar.cljc")
    '(require 'foo.bar)))


Now I understand that 'require' in cljs is intended as a repl-only thing  
which expands to an ns form: 
https://clojurescript.org/guides/ns-forms#_the_require_and_require_macros_macros

So, rather than 'cljs.core/require', then perhaps what'd work it to be able 
to hook in at the point the ns forms as read initially. 

Any ideas please let me know.

Thanks,
Henry

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