{
  description = ''
    Basic flake template for an overlay with flake.
  '';

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = inputs@{ self, nixpkgs, ... }:
    let inherit (inputs.flake-utils.lib) defaultSystems eachSystem flattenTree;
    in eachSystem defaultSystems (system:
      let pkgs = import nixpkgs { inherit system; };
      in {
        devShells.default = import ./shell.nix { inherit pkgs; };

        formatter = pkgs.nixpkgs-fmt;

        packages = flattenTree (self.overlays.default pkgs pkgs);
      }) // {
        overlays.default = final: prev: import ./pkgs { pkgs = prev; };

        nixosModules = { };
      };
}
