Well, I assume that means "every file on the system that Node can access", and on a sensibly configured system I hope Node can't access that many important files - and the files Node can access are either in some git repo or backed up regularly?
Node is a programming language. It's used in multiple contexts, not just web. It runs CLI tools, it's the basis of Electron apps. There's no reason to assume it has limited privileges to access files.
Heh... that's a pretty optimistic take on the average node deployment. There are far too many systems where devs force admins to run 777 on certain directories to fix their bugs—or worse yet, they just have direct access to the servers and no understanding of permissions.