{ lib }:
let
  # TODO: Add full Nix evaluation to single-use binding analysis.
  # NOLINT(single_use_binding)
  checkType = lib.types.submodule {
    options = {
      assertion = lib.mkOption {
        type = lib.types.functionTo lib.types.bool;
        description = ''
          Tests this registry's flattened collected entries.
        '';
      };

      message = lib.mkOption {
        type = lib.types.str;
        description = ''
          Describes the registry validation failure.
        '';
      };
    };
  };
in
{
  options = {
    type = lib.mkOption {
      type = lib.types.raw;
      description = ''
        Defines the NixOS option type for one registry entry.
      '';
    };

    checks = lib.mkOption {
      type = lib.types.listOf checkType;
      default = [ ];
      description = ''
        Contains validation checks for this registry's flattened collected entries.
      '';
    };
  };
}