import EventEmitter from '../utils/eventEmitter';
import { type ConnectionInfo, type SSEClientConfig, SSEConnectionState } from './types';
/**
 * SSE Client
 * 采用分层设计，分离了连接管理、状态管理、事件解析等职责
 */
export declare class SSEClient extends EventEmitter {
    readonly connectionId: string;
    private state;
    private controller?;
    private reader?;
    private connectionManager;
    private parser;
    private timeoutTimer?;
    private config;
    private logger;
    private url;
    private connectionInfo;
    private firstTokenReceived;
    constructor(url: string);
    /**
     * 连接 SSE 服务
     */
    connect(config: SSEClientConfig): Promise<void>;
    /**
     * 关闭连接
     */
    abort(): Promise<void>;
    /**
     * 获取连接状态
     */
    getStatus(): SSEConnectionState;
    /**
     * 获取连接信息
     */
    getInfo(): ConnectionInfo;
    /**
     * 建立连接
     */
    private establishConnection;
    /**
     * 读取流数据
     */
    private readStream;
    /**
     * 启动统一超时监控
     */
    private startTimeoutMonitor;
    /**
     * 解析SSE数据
     */
    private parseSSEData;
    /**
     * 简化的错误处理
     */
    private handleConnectionError;
    /**
     * 清理超时定时器
     */
    private clearTimeouts;
    /**
     * 设置连接状态
     */
    private setState;
    /**
     * 重置解析器状态
     */
    private resetParser;
    /**
     * 设置内部事件处理器
     */
    private setupInternalEventHandlers;
    /**
     * 生成连接ID
     */
    private generateConnectionId;
}