import { TransformableReadableStream } from "../../utils/stream-utils.js";
import type { Transport } from "../../types/transport.js";
export type EventSourceCallback<T = unknown> = (this: EventSource, event: MessageEvent<T>) => void;
export declare class SSETransport implements Transport {
    private url;
    private options;
    private eventSource;
    private eventSourceMap;
    constructor(url: string, options: {
        eventName: string;
        sseOptions?: EventSourceInit;
        onError?: (event: Event) => void;
        onOpen?: (event: Event) => void;
    });
    addEventListener: <T>(eventName: string, cb: EventSourceCallback<T>, 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;
}
//# sourceMappingURL=sse.d.ts.map