/**
 * Minimal Server-Sent Events parser for HTTP streaming responses.
 *
 * Yields parsed events as `{ event, data }` pairs. Per spec:
 *   - Each event is separated by a blank line
 *   - `event: foo` sets the event name (defaults to "message")
 *   - `data: ...` lines accumulate into the data buffer
 *   - `:` lines are comments and ignored
 *   - `id` / `retry` fields are accepted and ignored
 *
 * For Anthropic the wire format is canonical SSE with explicit `event:` lines.
 * For OpenAI / OpenAI-compatible the format omits `event:` and just emits
 * `data: <json>` chunks, with a final `data: [DONE]`. Both work with this
 * parser; consumers branch on event name or just on `data`.
 */
export interface SSEMessage {
    event: string;
    data: string;
}
export declare function parseSSE(body: ReadableStream<Uint8Array> | NodeJS.ReadableStream | null): AsyncIterable<SSEMessage>;
/**
 * SSE line-folding transform stream.
 *
 * Wraps an upstream `ReadableStream<Uint8Array>` so oversized `data:` fields
 * are split into multiple `data:` lines at JSON-safe boundaries. `parseSSE`
 * rejoins those lines with `\n`, which preserves semantic content for the
 * structured JSON envelopes emitted by provider streams while keeping the
 * per-line pending buffer under the safety cap.
 */
export declare function createSseLineFoldingTransform(source: ReadableStream<Uint8Array>, maxLineBytes?: number): ReadableStream<Uint8Array>;
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