/**
 * A single Server-Sent Event frame, parsed from a `text/event-stream` body.
 *
 * Only the two fields LLM gateways use in practice are surfaced: the optional
 * `event:` name and the (possibly multi-line) `data:` payload. Comment lines
 * (`:`-prefixed) and `id:` / `retry:` fields are consumed and ignored.
 */
export interface SseEvent {
    /** The `event:` field, if the frame declared one. */
    event?: string | undefined;
    /** The concatenated `data:` payload (multiple `data:` lines joined by `\n`). */
    data: string;
}
/**
 * Frame a `text/event-stream` response body into {@link SseEvent}s.
 *
 * Standalone and dependency-free so the gateway template ships its own
 * framing — every built-in chat provider streams through a vendor SDK, so
 * there is no shared framer to reuse. Handles `\n` and `\r\n` line endings,
 * multi-line `data:` payloads, and back-pressure-friendly chunk boundaries
 * (an event split across two network reads is buffered until complete).
 *
 * Aborts cleanly: when `signal` fires, the reader is cancelled and iteration
 * ends. A trailing event with no terminating blank line is still yielded once
 * the stream closes.
 */
export declare function parseSseStream(body: ReadableStream<Uint8Array>, signal?: AbortSignal): AsyncGenerator<SseEvent>;
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