Method once

lib/internal/event_target.js:1017–1023

* @param {string} type * @param {EventTargetCallback|EventListener} listener * @returns {NodeEventTarget}

(type, listener)

   * @returns {NodeEventTarget}
   */
  once(type, listener) {
    if (!isNodeEventTarget(this))
      throw new ERR_INVALID_THIS('NodeEventTarget');
    this.addEventListener(type, listener,
                          { once: true, [kIsNodeStyleListener]: true });
    return this;
  }

  /**
   * @param {string} [type]