If @kommen's issue tends to arise when you have a dependency graph, it could explain a large class of :npm-deps "Undefined nameToPath" failures. I'm digging into it via https://dev.clojure.org/jira/browse/CLJS-2757

@mfikes your conclusion is correct "This appears to be the result of Closure failing to find the correct paths to the modules and simply emitting module$<symbol>". Closure usually emits a warning when doing so though. Might be worth checking if warnings are accidentally discarded.

Ahh, thanks!