import type { NexusStream, StreamChunk } from '../types/response.js';
/** Reads a stream to the end and returns its text. */
export declare function collectStream(stream: NexusStream): Promise<string>;
/** Transforms each chunk of a stream. */
export declare function mapStream(stream: NexusStream, mapChunk: (chunk: StreamChunk) => StreamChunk | Promise<StreamChunk>): AsyncGenerator<StreamChunk>;
/** A stream that yields one text chunk and finishes, for tests and cached answers. */
export declare function createTextStream(text: string): NexusStream;