export interface WebSocketOptions<T = any> {
    protocols?: string | string[];
    timeout?: number;
    maxAttempts?: number;
    onOpen?: (event: Event) => any;
    onMessage?: (event: MessageEvent<T>) => any;
    onReconnect?: (event: Event | CloseEvent) => any;
    onMaximum?: (event: Event | CloseEvent) => any;
    onClose?: (event: CloseEvent) => any;
    onError?: (event: Event) => any;
}
export declare class WsHandler<T = any> {
    private url;
    private options;
    private webSocket;
    private attempts;
    private timer;
    private pending;
    constructor(url: string, options?: WebSocketOptions<T>);
    private open;
    reconnect(event: Event | CloseEvent): void;
    json(payload: any): void;
    send(payload: any): void;
    close(code?: number, reason?: string): void;
    updateUrl(url: string): void;
    getWebSocket(): WebSocket;
    get state(): number;
    get isOpen(): boolean;
}