{
  lib,
  snow,
  ...
}: let
  inherit
    (lib)
    mkOption
    types
    literalExpression
    ;
  inherit
    (snow.lib)
    mkPerSystemFlakeOutput
    ;
in
  mkPerSystemFlakeOutput {
    name = "devShells";
    option = mkOption {
      type = types.lazyAttrsOf types.package;
      default = {};
      description = ''
        An attribute set of packages to be used as shells.
        [`nix develop .#<name>`](https://nixos.org/manual/nix/stable/command-ref/new-cli/nix3-develop.html) will run `devShells.<name>`.
      '';
      example = literalExpression ''
        {
          default = pkgs.mkShell {
            nativeBuildInputs = with pkgs; [ wget bat cargo ];
          };
        }
      '';
    };
    file = ./devShells.nix;
  }