/**
 * EventSubscriber - Real-time event subscriptions for flashQ.
 * Supports SSE (Server-Sent Events) and WebSocket connections.
 */
import { EventEmitter } from 'events';
import type { EventSubscriberOptions, EventSubscriberEvents } from './types';
export declare class EventSubscriber extends EventEmitter {
    private options;
    private eventSource;
    private websocket;
    private connected;
    private reconnectAttempts;
    private reconnectTimer;
    private closed;
    private sseHandlers;
    private wsMessageHandler;
    constructor(options?: EventSubscriberOptions);
    private log;
    on<K extends keyof EventSubscriberEvents>(event: K, listener: EventSubscriberEvents[K]): this;
    off<K extends keyof EventSubscriberEvents>(event: K, listener: EventSubscriberEvents[K]): this;
    emit<K extends keyof EventSubscriberEvents>(event: K, ...args: Parameters<EventSubscriberEvents[K]>): boolean;
    connect(): Promise<void>;
    close(): void;
    isConnected(): boolean;
    private connectSSE;
    private connectWebSocket;
    private normalizeEvent;
    private scheduleReconnect;
}
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