[bakareika]

As an author of a (small) number of npm+bower packages I must admit that nope, that's not "standard" in any meaningful way.

[TheHydroImpulse]

It's definitely standard in Node land and also Component(1). Bower, on the other hand, does not and thus is the culprit.

[skeoh]

index.js is only 'standard' in node insofar as it is the fallback entry point if a package.json file is not found or does not specify a 'main' file.