import { TransactionStatusResponse } from "../lib/status/types/index.js";
export declare class WebsocketHandler {
    #private;
    constructor(url: string);
    onUpdate(handler: (taskStatus: TransactionStatusResponse) => void): void;
    offUpdate(handler: (taskStatus: TransactionStatusResponse) => void): void;
    onError(handler: (error: Error) => void): void;
    offError(handler: (error: Error) => void): void;
    subscribe(taskId: string): Promise<void>;
    unsubscribe(taskId: string): Promise<void>;
    hasHandlers(): boolean;
    private _connect;
    private _sendWebsocketMessage;
    private _disconnectIfUnused;
    private _disconnect;
    private _reconnect;
    private _ensureIsConnected;
    private _awaitConnection;
    private _handleError;
}