core/lib/tests/modules/emptyValues.nix

{ lib, ... }:
let
  inherit (lib) types;
in
{

  options = {
    int = lib.mkOption { type = types.lazyAttrsOf types.int; };
    list = lib.mkOption { type = types.lazyAttrsOf (types.listOf types.int); };
    nonEmptyList = lib.mkOption { type = types.lazyAttrsOf (types.nonEmptyListOf types.int); };
    attrs = lib.mkOption { type = types.lazyAttrsOf (types.attrsOf types.int); };
    null = lib.mkOption { type = types.lazyAttrsOf (types.nullOr types.int); };
    submodule = lib.mkOption { type = types.lazyAttrsOf (types.submodule { }); };
  };

  config = {
    int.a = lib.mkIf false null;
    list.a = lib.mkIf false null;
    nonEmptyList.a = lib.mkIf false null;
    attrs.a = lib.mkIf false null;
    null.a = lib.mkIf false null;
    submodule.a = lib.mkIf false null;
  };

}