text: import qs from 'query-string';
  
  // add rx methods to express
  export default function getExpressExtensions() {
    return function expressExtensions(req, res, next) {
      res.redirectWithFlash = uri => {
        const flash = req.flash();
        res.redirect(
          `${uri}?${qs.stringify(
            { messages: qs.stringify(flash, { arrayFormat: 'index' }) },
            { arrayFormat: 'index' }
          )}`
        );
      };
      res.sendFlash = (type, message) => {
        if (type && message) {
          req.flash(type, message);
        }
        return res.json(req.flash());
      };
      next();
    };
  }
  