Method subscribe

javascript/selenium-webdriver/bidi/index.js:237–273

* Subscribe to events * @param events * @param browsingContexts * @returns {Promise }

(events, browsingContexts)

   * @returns {Promise<void>}
   */
  async subscribe(events, browsingContexts) {
    function toArray(arg) {
      if (arg === undefined) {
        return []
      }

      return Array.isArray(arg) ? [...arg] : [arg]
    }

    const eventsArray = toArray(events)
    const contextsArray = toArray(browsingContexts)

    const params = {
      method: 'session.subscribe',
      params: {},
    }

    if (eventsArray.length && eventsArray.some((event) => typeof event !== 'string')) {
      throw new TypeError('events should be string or string array')
    }

    if (contextsArray.length && contextsArray.some((context) => typeof context !== 'string')) {
      throw new TypeError('browsingContexts should be string or string array')
    }

    if (eventsArray.length) {
      params.params.events = eventsArray
    }

    if (contextsArray.length) {
      params.params.contexts = contextsArray
    }

    this.events.push(...eventsArray)

    await this.send(params)
  }

  /**
   * Unsubscribe to events