{
  inputs = {
    nixpkgs = {
      type = "github";
      owner = "karaolidis";
      repo = "nixpkgs";
      ref = "integration";
    };

    flake-utils = {
      url = "github:numtide/flake-utils";
    };
  };

  outputs =
    { nixpkgs, ... }@inputs:
    inputs.flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
      in
      {
        devShells.default = pkgs.mkShell { packages = [ ]; };

        formatter = pkgs.nixfmt-rfc-style;
      }
    );
}