flake.nix

{
  inputs = {
    nixpkgs = {
      type = "github";
      owner = "nixos";
      repo = "nixpkgs";
      ref = "nixos-unstable";
    };

    fenix = {
      type = "github";
      owner = "nix-community";
      repo = "fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    flake-utils = {
      type = "github";
      owner = "numtide";
      repo = "flake-utils";
    };
  };

  outputs = {
    nixpkgs,
    fenix,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachDefaultSystem (
      system: let
        pkgs = import nixpkgs {
          inherit system;
        };
      in {
        devShells.default = pkgs.mkShell {
          buildInputs = [fenix.packages.${system}.stable.toolchain];
        };

        formatter = pkgs.alejandra;
      }
    );
}