import type { OAuthClient } from './oauth-client.js';
import type { AstridChannelConfig, AgentSSEEvent } from './types.js';
type EventHandler = (event: AgentSSEEvent) => void;
/**
 * SSE client using fetch + ReadableStream (supports Authorization headers).
 * Reconnects with exponential backoff. Keepalive timeout at 90s.
 */
export declare class SSEClient {
    private config;
    private oauth;
    private abortController;
    private connected;
    private lastEventTime;
    private reconnectAttempts;
    private handlers;
    private keepaliveTimer;
    private stopped;
    constructor(config: AstridChannelConfig, oauth: OAuthClient);
    on(eventType: string, handler: EventHandler): void;
    isConnected(): boolean;
    connect(): Promise<void>;
    disconnect(): void;
    private scheduleReconnect;
    private parseBuffer;
    private dispatch;
    /** Map internal server event types to agent protocol event names */
    private mapEventType;
    private startKeepalive;
    private resetKeepalive;
    private stopKeepalive;
}
export {};
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