import type { INetworkTransport } from './engine_networking_types.js';
/** Default transport that wraps the `websocket-ts` library */
export declare class WebsocketTransport implements INetworkTransport {
    private _url;
    private _ws;
    onOpen: (() => void) | null;
    onClose: (() => void) | null;
    onError: ((err: any) => void) | null;
    onMessage: ((data: string | Blob) => void) | null;
    get url(): string;
    constructor(url: string);
    start(): Promise<void>;
    send(data: string | Uint8Array): void;
    close(): void;
}