import { WebSocket } from 'ws';
type RelayServerConnectionRequest = {
    url?: string;
};
export type WebsocketRelayServerOptions = {
    port?: number;
    host?: string;
    path?: string;
    isServerConnection?: (socket: WebSocket, request: RelayServerConnectionRequest) => boolean;
};
export declare class WebsocketRelayServer {
    #private;
    constructor(options?: WebsocketRelayServerOptions);
    get port(): number | null;
    close(): void;
    private on_connection;
    private on_message;
    private on_close;
    private on_subscribe;
    private on_unsubscribe;
    private on_publish;
    private on_broadcast;
}
export {};