I don't know what this article is about (looks like it's not worth reading), but I've switched to CS (IcedCoffeeScript, to be precise) for my Node.js app (a behemoth of an app!), and am much much happier. Sure, it has problems too, but they are more tolerable than having to do (if typeof(x)=='function' && x!=null) over and over again IMO, and the vast majority of them will be gone when we have SourceMaps (which shouldn't take long, maybe a couple more months).