I included a non-Clojurescript directory in the checkout of a clojurescript project and started getting the following error:
Compiling ClojureScript...
WARNING: no :cljsbuild entry found in project definition.
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WARNING: your :cljsbuild configuration is in a deprecated format. It has been
automatically converted it to the new format, which will be printed below.
It is recommended that you update your :cljsbuild configuration ASAP.
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:cljsbuild
{:builds []}
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See https://github.com/emezeske/lein-cljsbuild/blob/master/README.md
for details on the new format.
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I found my solution here