{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";

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

    treefmt-nix = {
      url = "github:numtide/treefmt-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      flake-utils,
      treefmt-nix,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        treefmtEval = treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
      in
      {
        formatter = treefmtEval.config.build.wrapper;

        checks.formatting = treefmtEval.config.build.check self;

        packages.default = pkgs.callPackage ./package.nix { };

        devShells.default = pkgs.mkShellNoCC {
          packages = with pkgs; [
            python3
            pyright 
            ruff
            uv 
          ];
        };
      }
    );
}