import { StreamChunk } from './types.js';
/**
 * Collect all text content from a StreamChunk async iterable and return as a string.
 *
 * This function consumes the entire stream, accumulating content from TEXT_MESSAGE_CONTENT events,
 * and returns the final concatenated text.
 *
 * @param stream - AsyncIterable of StreamChunks from chat()
 * @returns Promise<string> - The accumulated text content
 *
 * @example
 * ```typescript
 * const stream = chat({
 *   adapter: openaiText(),
 *   model: 'gpt-4o',
 *   messages: [{ role: 'user', content: 'Hello!' }]
 * });
 * const text = await streamToText(stream);
 * console.log(text); // "Hello! How can I help you today?"
 * ```
 */
export declare function streamToText(stream: AsyncIterable<StreamChunk>): Promise<string>;
/**
 * Convert a StreamChunk async iterable to a ReadableStream in Server-Sent Events format
 *
 * This creates a ReadableStream that emits chunks in SSE format:
 * - Each chunk is prefixed with "data: "
 * - Each chunk is followed by "\n\n"
 * - Stream ends with "data: [DONE]\n\n"
 *
 * @param stream - AsyncIterable of StreamChunks from chat()
 * @param abortController - Optional AbortController to abort when stream is cancelled
 * @returns ReadableStream in Server-Sent Events format
 */
export declare function toServerSentEventsStream(stream: AsyncIterable<StreamChunk>, abortController?: AbortController): ReadableStream<Uint8Array>;
/**
 * Convert a StreamChunk async iterable to a Response in Server-Sent Events format
 *
 * This creates a Response that emits chunks in SSE format:
 * - Each chunk is prefixed with "data: "
 * - Each chunk is followed by "\n\n"
 * - Stream ends with "data: [DONE]\n\n"
 *
 * @param stream - AsyncIterable of StreamChunks from chat()
 * @param init - Optional Response initialization options (including `abortController`)
 * @returns Response in Server-Sent Events format
 *
 * @example
 * ```typescript
 * const stream = chat({ adapter: openaiText(), model: "gpt-4o", messages: [...] });
 * return toServerSentEventsResponse(stream, { abortController });
 * ```
 */
export declare function toServerSentEventsResponse(stream: AsyncIterable<StreamChunk>, init?: ResponseInit & {
    abortController?: AbortController;
}): Response;
/**
 * Convert a StreamChunk async iterable to a ReadableStream in HTTP stream format (newline-delimited JSON)
 *
 * This creates a ReadableStream that emits chunks as newline-delimited JSON:
 * - Each chunk is JSON.stringify'd and followed by "\n"
 * - No SSE formatting (no "data: " prefix)
 *
 * This format is compatible with `fetchHttpStream` connection adapter.
 *
 * @param stream - AsyncIterable of StreamChunks from chat()
 * @param abortController - Optional AbortController to abort when stream is cancelled
 * @returns ReadableStream in HTTP stream format (newline-delimited JSON)
 *
 * @example
 * ```typescript
 * const stream = chat({ adapter: openaiText(), model: "gpt-4o", messages: [...] });
 * const readableStream = toHttpStream(stream);
 * // Use with Response for HTTP streaming (not SSE)
 * return new Response(readableStream, {
 *   headers: { 'Content-Type': 'application/x-ndjson' }
 * });
 * ```
 */
export declare function toHttpStream(stream: AsyncIterable<StreamChunk>, abortController?: AbortController): ReadableStream<Uint8Array>;
/**
 * Convert a StreamChunk async iterable to a Response in HTTP stream format (newline-delimited JSON)
 *
 * This creates a Response that emits chunks in HTTP stream format:
 * - Each chunk is JSON.stringify'd and followed by "\n"
 * - No SSE formatting (no "data: " prefix)
 *
 * This format is compatible with `fetchHttpStream` connection adapter.
 *
 * @param stream - AsyncIterable of StreamChunks from chat()
 * @param init - Optional Response initialization options (including `abortController`)
 * @returns Response in HTTP stream format (newline-delimited JSON)
 *
 * @example
 * ```typescript
 * const stream = chat({ adapter: openaiText(), model: "gpt-4o", messages: [...] });
 * return toHttpResponse(stream, { abortController });
 * ```
 */
export declare function toHttpResponse(stream: AsyncIterable<StreamChunk>, init?: ResponseInit & {
    abortController?: AbortController;
}): Response;