meteor-skeleton | simple boilerplate for creating Meteor applications | Caching library

Looks like the issue isn't your code that you posted, but when Meteor eagerly loads files it does two things.

1. It loads them alphabetically, so skel-layout is running before skel.min which is the error in your console. skel.min needs to run first.
2. It wraps them in a new closure, so they don't pollute the global namespace.

In addition to that, because skel.min uses the UMD pattern and Meteor uses common.js, it registers itself with the module loader so it can be called with require(), instead of loading itself onto the window global.

Looking at the code in the skel repo, skel-layout and skel-viewport doesn't use UMD or attempt to require() or import skel, it just expects it to be available in the current scope.

In other words. Skel have half-arsed their module pattern.

Thankfully there's a quick fix. Put all three files in the client/compatibility folder and prefix the names with the load order: