import type { Transport } from "../../types/transport.js";
import { TransformableReadableStream } from "../../utils/stream-utils.js";
type SocketPayload = {
    event: string;
    payload: unknown;
};
export declare class WebSocketTransport implements Transport {
    private url;
    private options;
    private socket;
    private socketEventMap;
    private socketEventCallbackMap;
    constructor(url: string, options: {
        eventName: string;
        protocols?: string | string[];
        onError?: (event: Event) => void;
        onOpen?: (event: Event) => void;
    });
    addEventListener: <T extends SocketPayload>(eventName: string, cb: (data?: T["payload"]) => void, options?: AddEventListenerOptions) => () => void;
    send(data?: Record<string, unknown>, options?: Omit<RequestInit, "body">): Promise<{
        response: Promise<Response>;
        readableStream: TransformableReadableStream<string> | null;
    }>;
    send(url: string, data?: Record<string, unknown>, options?: Omit<RequestInit, "body">): Promise<{
        response: Promise<Response>;
        readableStream: TransformableReadableStream<string> | null;
    }>;
    transportUrl: () => string;
    close: () => void;
}
export {};
//# sourceMappingURL=websocket.d.ts.map