import { NotificationService, NotificationEventHandler } from './NotificationService';
export declare class NotificationsHandler {
    #private;
    constructor({ notificationService, callbacks, }: {
        notificationService: NotificationService;
        callbacks: NotificationEventHandler[];
    });
    /**
     * Opens the connection(s) to receive notifications
     */
    open(): Promise<void>;
    /**
     * Connect to the EventSource API and attach event handlers
     * @param client Client - The Haystack Client
     */
    private start;
    /**
     * On push notification event, parse result and update store
     * @param event MessageEvent
     */
    private onNotificationReceived;
    /**
     * Calls the callbacks when new notification(s) received
     * @param notifications Notifications[]
     */
    private callNotificationHandlers;
    /**
     * On push notification error, close EventSource and begin poll
     * @param client Client
     */
    private onNotificationPushError;
    /**
     * Starts a poll on the notifications API, sorting
     * the requested notifications by time
     * @param client Client - The Haystack Client
     */
    private initializePoll;
    private setLastNotificationUpdateTime;
    private poll;
    /**
     * Close EventSource API connection and stop API Polling
     */
    close(): void;
    /**
     * @throws An error if the watch is closed.
     */
    private throwErrorIfClosed;
}