code: public Thl doWith(final Consumer<TemplateEngine> callback) {
      requireNonNull(callback, "Callback required.");
      return doWith((e, c) -> callback.accept(e));
    }
docs: Set a configuration callback.
  
  <pre>{@code
  {
  use(new Thl().doWith(engine -> {
  ...
  }));
  }
  }</pre>
  
  @param callback Callback.
  @return This module.