Method _push

lib/hccrawler.js:278–282

* @param {!Object} options * @param {!number} depth * @param {string} previousUrl * @return {!Promise}

(options, depth, previousUrl)

   * @return {!Promise}
   */
  async _push(options, depth, previousUrl) {
    let { priority } = options;
    if (!priority && options.depthPriority) priority = depth;
    await this._queue.push(options, depth, previousUrl, priority);
  }

  /**
   * @param {!Object} options