Previously, node-sass was in both peerDependencies and devDependencies. In #533 it was removed from peerDependencies. Now it's only listed in devDependencies, so the package only works if dev dependencies are installed and there's no warning if it's missing. Shouldn't node-sass be in dependencies instead, so it's always installed even in production mode? The package requires it to function, it's not just there for development purposes.