import { IReadable } from '../../types.js';
/**
 * read exactly N bytes from the source
 *
 * @param readable  fuman readable stream
 * @param length  length of the buffer to read, or a buffer to read into (when a number is passed, a new buffer will be allocated)
 * @param onEof  what to do when the end of the stream is reached
 *  - `error` - throw an {@link PartialReadError}
 *  - `truncate` - truncate the buffer to the number of bytes that were read. note that this might return 0 bytes
 */
export declare function exactly(readable: IReadable, length: number | Uint8Array, onEof?: 'error' | 'truncate'): Promise<Uint8Array>;
/**
 * read the source until it ends, and return the buffer
 *
 * @param readable  fuman readable stream
 * @param chunkSize  size of the chunks to read
 */
export declare function untilEnd(readable: IReadable, chunkSize?: number): Promise<Uint8Array>;