{
  sources ? import ./npins,
  pkgs ? import sources.nixpkgs { },
}:
let
  treefmt = pkgs.callPackage ./tools/treefmt.nix { inherit sources; };
in
pkgs.mkShellNoCC {
  packages = [
    pkgs.npins
    pkgs.nix-init
    pkgs.nix-update
    treefmt
  ];
}