action.js

      action(query) {
        const options = Object.assign({ cache: true }, query.options);
        let key = Object.assign({}, query.expression, options);
        key = JSON.stringify(sortObject(key));

        const value = QUERY_CACHE[key];
        if (value) {
          if ((new Date()) > value) {
            delete QUERY_CACHE[key];
          } else {
            return this.source.cache.query(query);
          }
        }

        // create a cache entry in the weakmap
        if (options.cache) {
          const date = new Date();
          date.setTime(date.getTime() + (CACHE_TIME_HOUR * 60 * 60 * 1000));
          QUERY_CACHE[key] = date;
        }

        // hit the target store
        return this.target.pull(query);
      },