{
  description = "Configuration for NixOS";
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nixos-hardware.url = "github:nixos/nixos-hardware";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    sops-nix.url = "github:Mic92/sops-nix";
    sops-nix.inputs.nixpkgs.follows = "nixpkgs";

    # flake-parts.url = "github:hercules-ci/flake-parts";
  };
  # https://nix.dev/tutorials/nix-language.html#named-attribute-set-argument
  outputs = inputs@{self, nixpkgs, nixos-hardware, home-manager, sops-nix, ...}:
  let
    lib = import ./lib { inherit (nixpkgs) lib; };
  in
  {
    # NOTE: Run `nix flake show` to see what this flake has to offer.
    # TODO: Enable automated formatting with numtide/treefmt-nix
    # `nixos-rebuild switch --flake .#<hostname>`
    nixosConfigurations = {
      neon = nixpkgs.lib.nixosSystem {
        specialArgs = { inherit inputs; };
        system = "x86_64-linux";
        modules = [
          ./hosts/neon
        ];
      };
      #lithium = nixpkgs.lib.nixosSystem {
        #specialArgs = { inherit inputs; };
        #system = "x86_64-linux";
        #modules = [
          #./hosts/lithium
        #];
      #};
      lithium = lib.mkSystem {
        users = [
          { name = "jml"; }
        ];
      };
    }; 
    homeConfigurations = {
      "jml" = home-manager.lib.homeManagerConfiguration {
        modules = [
          ./users/jml/home.nix
        ];
      };
    };
    # TODO: Implement a dev shell for working on this repository.
    # Personally I'm using hx, nil, and git-agecrypt
    # The only thing totally necessary which isn't captured by the flake inputs
    # is git-agecrypt so that should be included here or somehow in the flake.
    devShells.x86_64-linux.default = pkgs.mkShell {
      buildInputs = with pkgs; [
        nixpkgs-fmt
        sops
        age
        git-agecrypt
      ];
      shellHook = ''
        echo "ready to rock"
      '';
    };
    # `nix run .#name` and `nix build .#name`
    # packages = {};
    # `home-manager switch`
    # homeConfigurations = {};
  };
}