Method track

src/extension-analytics.js:160–177

* The #track() method takes in a unique custom-event name, and the * corresponding request url (or an array of request urls). One can call * #track() multiple times with different eventType name (order doesn't * matter) before #build() is called. * @param {string} eventType * @param {

(eventType, request)

   * @return {!CustomEventReporterBuilder}
   */
  track(eventType, request) {
    request = isArray(request) ? request : [request];
    devAssert(
      !this.config_['triggers'][eventType],
      'customEventReporterBuilder should not track same eventType twice'
    );
    const requestList = [];
    for (let i = 0; i < request.length; i++) {
      const requestName = `${eventType}-request-${i}`;
      this.config_['requests'][requestName] = request[i];
      requestList.push(requestName);
    }
    this.config_['triggers'][eventType] = {
      'on': eventType,
      'request': requestList,
    };
    return this;
  }

  /**
   * Call the #build() method to build and get the CustomEventReporter instance.