Method removeCallback

javascript/selenium-webdriver/bidi/index.js:461–484

* Removes exactly the callback registered under `subscriptionId` (as * returned by addCallback). A no-op if already removed — including * once the connection is closed, since _failPending() has already cleaned * up local state at that point (and there is no remote end left to reach:

(subscriptionId)

   * @returns {Promise<void>}
   */
  async removeCallback(subscriptionId) {
    const entry = this._callbacks.get(subscriptionId)
    if (entry === undefined) {
      return
    }

    if (entry.removing === undefined) {
      entry.removing = (async () => {
        const response = await this.send({
          method: 'session.unsubscribe',
          params: { subscriptions: [subscriptionId] },
        })
        if (response?.error !== undefined) {
          throw new Error(`${response.error}: ${response.message}`)
        }
        this._callbacks.delete(subscriptionId)
        this.off(entry.method, entry.handler)
      })().finally(() => {
        entry.removing = undefined
      })
    }

    return entry.removing
  }

  /**
   * Close ws connection.