import { Transport } from '../protocol/types.js';
import { EventEmitter } from 'events';
export interface SSETransportConfig {
    port?: number;
    host?: string;
    path?: string;
    cors?: boolean;
    maxConnections?: number;
}
export declare class SSETransport extends EventEmitter implements Transport {
    private server?;
    private clients;
    private messageHandlers;
    private errorHandlers;
    private closeHandlers;
    private config;
    private isStarted;
    constructor(config?: SSETransportConfig);
    start(): Promise<void>;
    stop(): Promise<void>;
    send(data: unknown): Promise<void>;
    onMessage(handler: (data: unknown) => void): void;
    onError(handler: (error: Error) => void): void;
    onClose(handler: () => void): void;
    private handleHttpRequest;
    private handleSSEConnection;
    private handleMessagePost;
    private handleHealthCheck;
    private handleError;
    getConnectionInfo(): {
        url: string;
        clients: number;
    };
}
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