{pkgs, ...}: let
  inherit (builtins) isAttrs isPath isString readFile;
  inherit (pkgs.lib) fix mkOption types;
in
  fix (self: {
    module = types.submodule {
      options = {
        init = mkOption {
          type = with types; nullOr (either path str);
          default = null;
          description = ''
            Lua code to call before plugins loaded
          '';
        };

        postInit = mkOption {
          type = with types; nullOr (either path str);
          default = null;
          description = ''
            Lua code called after init but before import
          '';
        };

        config = mkOption {
          type = with types; nullOr (either path str);
          default = null;
          description = ''
            Lua code called after all plugins are loaded
          '';
        };
      };
    };

    option = mkOption {
      default = null;
      description = ''
        init.lua configuration
      '';
      type = with types; nullOr (oneOf [path str self.module]);
      example = ./init.lua;
    };

    mkCustomLuaRc = init:
      if isString init
      then init
      else if isPath init
      then readFile init
      else if isAttrs init
      then "print('not implmented yet')"
      else null;
  })