code: public ImmutableList<String> getTemplateTypeNames() {
      if (info == null || info.templateTypeNames == null) {
        return ImmutableList.of();
      }
      return ImmutableList.copyOf(info.templateTypeNames);
    }
docs: Gets the @template type names.
  
  <p>Excludes @template types from TTL; get those with {@link #getTypeTransformations()}