emplateInstanceBase : TemplateInstanceBase;
      let klass = class extends base { }
      klass.prototype.__templatizeOptions = options;
      klass.prototype._bindTemplate(template);
      addNotifyEffects(klass, template, templateInfo, options);
      return klass;
    }

    function addPropagateEffects(template, templateInfo, options) {
      let userForwardHostProp = options.forwardHostProp;
      if (userForwardHostProp) {
        // Provide data API and property effects on memoized template class
  