Certainly. You'd be just a `nix-shell -p nodejs` away from being in a shell with NPM. And a C^D away from not having it installed, with a caveat that it would b

Certainly. You'd be just a `nix-shell -p nodejs` away from being in a shell with NPM. And a C^D away from not having it installed, with a caveat that it would be cleaned up periodically and not immediately after exiting the shell. But I think there's an option for immediately removing after use as well.