{
  self,
  stdenv,
  lib,
  writers,
  nodejs,
  fetchurl,
  model ? "",
  serverUrl ? "",
  local ? true,
  ...
}: let
  sgjpModel = fetchurl {
    url = "https://zil.ipipan.waw.pl/Concraft?action=AttachFile&do=get&target=concraft-pl-model-SGJP-20220221.gz";
    hash = "sha256-VcvdSkJwUhAgHroA0d/bH3QDjjO/2x8HqSuUvRgIN/4=";
  };

  targetModel =
    if model == ""
    then sgjpModel
    else model;
in
  writers.makeScriptWriter {interpreter = "${nodejs}/bin/node";} "conmorfeusz" ''
    // Passed from Nix derivation config
    const MORFEUSZ_ANALYSER_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_analyzer";
    const MORFEUSZ_GENERATOR_BIN="${self.packages.${stdenv.hostPlatform.system}.morfeusz}/bin/morfeusz_generator";
    const CONCRAFT_BIN="${self.packages.${stdenv.hostPlatform.system}.concraft-pl}/bin/concraft-pl";
    const CONCRAFT_MODEL="${targetModel}";
    const CONCRAFT_SERVER_URL="${serverUrl}";
    const CONCRAFT_MODE="${
      if local
      then "local"
      else "remote"
    }";
    // =================================

    ${builtins.readFile ./index.js}
  ''