How to use the node-opcua-secure-channel.SequenceNumberGenerator function in node-opcua-secure-channel

*
     * @property maxNotificationsPerPublish
     * @type {Number}
     * #default 0
     */
    subscription.maxNotificationsPerPublish = _adjust_maxNotificationsPerPublish(options.maxNotificationsPerPublish);

    subscription._life_time_counter = 0;
    subscription.resetLifeTimeCounter();

    // notification message that are ready to be sent to the client
    subscription._pending_notifications = new Dequeue();

    subscription._sent_notifications = [];

    subscription._sequence_number_generator = new SequenceNumberGenerator();

    // initial state of the subscription
    subscription.state = SubscriptionState.CREATING;

    subscription.publishIntervalCount = 0;

    subscription.monitoredItems = {}; // monitored item map

    /**
     *  number of monitored Item
     *  @property monitoredItemIdCounter
     *  @type {Number}
     */
    subscription.monitoredItemIdCounter = 0;

    subscription.publishingEnabled = _adjust_publishinEnable(options.publishingEnabled);

this.resetKeepAliveCounter();

    this.lifeTimeCount = _adjust_lifeTimeCount(
      options.lifeTimeCount || 0, this.maxKeepAliveCount, this.publishingInterval);

    this.maxNotificationsPerPublish = _adjust_maxNotificationsPerPublish(options.maxNotificationsPerPublish);

    this._life_time_counter = 0;
    this.resetLifeTimeCounter();

    // notification message that are ready to be sent to the client
    this._pending_notifications = new Dequeue();

    this._sent_notifications = [];

    this._sequence_number_generator = new SequenceNumberGenerator();

    // initial state of the subscription
    this.state = SubscriptionState.CREATING;

    this.publishIntervalCount = 0;

    this.monitoredItems = {}; // monitored item map

    this.monitoredItemIdCounter = 0;

    this.publishingEnabled = _adjust_publishinEnable(options.publishingEnabled);

    this.subscriptionDiagnostics = createSubscriptionDiagnostics(this);

    // A boolean value that is set to TRUE to mean that either a NotificationMessage or a keep-alive
    // Message has been sent on the Subscription. It is a flag that is used to ensure that either a