"hide" non-exported defs in :npm-module
"hide" non-exported defs in :npm-module

technically still exported to avoid breaking existing builds
but tools like storybook should no longer find them because
of enumerable: false.

fixes #710

thheller/shadow-cljs,thheller/shadow-devtools,thheller/shadow-cljs,thheller/shadow-devtools,thheller/shadow-devtools,thheller/shadow-cljs,thheller/shadow-cljs,thheller/shadow-devtools