This is my current system configuration. For now it's only compatible with macOS, but I'm going to port it to NixOS and probably any other linux with Nix Package Manager installed.
For this to work you need to have nix-darwin installed.
After that, run
darwin-rebuild switch --flake .#milliaAlso this one might work for nixos, but I haven't tried it yet and nixos config are 100% generated default.
nixos-rebuild switch --flake .#nixos