import type { StreamChunk } from './types.js';
/**
 * Convert an ai-sdk agent stream to Vercel AI SDK Data Stream Protocol format
 * (the v4 wire that `X-Vercel-AI-Data-Stream: v1` selects and `useChat()` reads).
 *
 * Protocol prefixes:
 * - `0:` text delta (JSON string)
 * - `9:` tool call, complete (JSON: toolCallId + toolName + args)
 * - `a:` tool result (JSON: toolCallId + result)
 * - `b:` tool call streaming start (JSON: toolCallId + toolName)
 * - `c:` tool call delta (JSON: toolCallId + argsTextDelta)
 * - `e:` finish step (JSON: finishReason + usage)
 * - `d:` finish message (JSON: finishReason + usage)
 *
 * @see https://ai-sdk.dev/v4/docs/ai-sdk-ui/stream-protocol
 */
export declare function toVercelDataStream(stream: AsyncIterable<StreamChunk>): ReadableStream<Uint8Array>;
/** Create a Response object with proper headers for Vercel AI SDK streaming. */
export declare function toVercelResponse(stream: AsyncIterable<StreamChunk>): Response;
//# sourceMappingURL=vercel-protocol.d.ts.map