import { SseData } from '../types/entity';
import type { ConnectionClosedPayload } from '../types/entity';
interface WebSocketOptions {
    url: string;
    token: string;
    retryInterval?: number;
    connectTimeout?: number;
    maxRetries?: number;
    debug?: boolean;
    onMessage?: (response: SseData) => void;
    onReconnectSuccess?: () => void;
    onConnectionClosed?: (payload: ConnectionClosedPayload) => void;
    onMaxRetriesReached?: () => void;
    onConnectionChange?: (isConnected: boolean) => void;
}
declare class WebSocketClient {
    private url;
    private token;
    private websocket;
    private reconnectAttempts;
    private maxReconnectAttempts;
    private reconnectTimeout;
    private connectTimeout;
    private reconnectTimer;
    private handlers;
    private connected;
    private onMessageCallback?;
    private onReconnectSuccessCallback?;
    private onConnectionClosedCallback?;
    private onMaxRetriesReachedCallback?;
    private onConnectionChangeCallback?;
    private connectTimeoutRef;
    private isDestroyed;
    private debug;
    private lastPingTime;
    private pingCheckTimer;
    private pageVisibilityHandler;
    private isPageVisible;
    private lastVisibleTime;
    private readonly PING_TIMEOUT;
    private readonly PING_CHECK_INTERVAL;
    private readonly RECONNECT_DELAY;
    private readonly PAGE_HIDDEN_TOLERANCE;
    constructor(options: WebSocketOptions);
    private debugLog;
    private debugError;
    private debugWarn;
    subscribe(type: string, handler: Function): void;
    private addMessageHandler;
    connect(): Promise<string>;
    private notifyConnectionClosed;
    private handleReconnect;
    /**
     * 处理二进制消息（与 FRONTEND_PROTOBUF_PARSING_GUIDE_WEB.md 一致：0x01=Protobuf，0x7D=PING，0x7E=PONG）
     * @param buffer ArrayBuffer 数据
     */
    private handleBinaryMessage;
    /**
     * 处理文本消息
     * @param text 文本数据
     */
    private handleTextMessage;
    /**
     * 发送 pong 响应给服务端
     * @param timestamp 服务端发送的时间戳
     */
    private sendPong;
    /**
     * 初始化页面可见性检测
     * 用于处理页面在后台时定时器被节流的问题
     */
    private initPageVisibilityDetection;
    /**
     * 启动ping超时检测
     * 如果长时间未收到服务端ping，则认为连接断开，延迟后重连
     */
    private startPingTimeoutCheck;
    /**
     * 停止ping超时检测
     */
    private stopPingTimeoutCheck;
    /**
     * 延迟重连，防止重连风暴
     */
    private delayedReconnect;
    private cleanup;
    /**
     * 清理页面可见性检测监听器
     */
    private cleanupPageVisibilityDetection;
    unsubscribe(): void;
    destroyWebSocket(): void;
    close(): void;
    isConnected(): boolean;
    /**
     * 发送消息到服务器
     * @param data 要发送的数据（字符串、对象、ArrayBuffer、Blob 或 ArrayBufferView）
     *              - 字符串：直接发送 → Netty 接收为 TextWebSocketFrame
     *              - 对象：会被序列化为 JSON 字符串 → Netty 接收为 TextWebSocketFrame
     *              - ArrayBuffer/Blob/Uint8Array 等：以二进制形式发送 → Netty 接收为 BinaryWebSocketFrame
     * @returns 是否发送成功
     */
    send(data: string | object | ArrayBuffer | Blob | ArrayBufferView): boolean;
}
export default WebSocketClient;