code: function render(req, res, next)  {
      if (!req.session[sessionName].length) {
        next();
      } else {
        const resultHTML = [];
        async.each(
          req.session[sessionName],
          function(item, next) {
            beforeSingleRender(item, function(error, item) {
              if (error) return next(error);
              app.render(viewName, item, function(error, html) {
                if (error) return next(error);
                resultHTML.push(html);
                next(null);
              })
            })
          },
          function(error) {
            if (error) return next(error);
            req.session[sessionName].length = 0;
            afterAllRender(resultHTML, function(error, html) {
              if (error) return next(error);
              res.locals[localsName] = html;
              next();
            })
          }
        )
      }
    }
docs: Render notifications in queue.
  @private