code: function(qName, type) {
      var client = redis.client();
      var key = 'bull:' + qName + ':' + type;
      if (type === 'wait' || type === 'active') {
        return client.llenAsync(key);
      } else if (type === 'delayed') {
        return client.zcardAsync(key);
      } else if (type === 'completed' || type === 'failed') {
        return client.scardAsync(key);
      }
      throw new Error('You must provide a valid job type.');
    }
docs: Get the total number of jobs of type
  @param {String} qName Queue name
  @param {String} type Job type: {wait|active|delayed|completed|failed}
  @returns {Number} Total number of jobs