import { Writable, WritableOptions } from 'stream';
export type ChunkSplitterFactory = () => (chunk: Buffer, encoding: BufferEncoding) => [Buffer, Buffer?];
/**
 * Implementation of splitter should return either one or two `Buffer`s.
 *
 * The first `Buffer` will be written to the current chunk.
 * If the second `Buffer` is returned, `chunkifier` will create a new chunk and write the
 * second buffer to the new chunk.
 */
export type ChunkSplitter = (chunk: Buffer, encoding: BufferEncoding) => [Buffer, Buffer?];
/**
 * Implementation of chunk sink should return each time a new writable stream.
 *
 * `n` determines which stream it is in sequence.
 */
export type ChunkSink<S extends Writable = Writable> = (n: number) => S;
export interface ChunkifierOptions extends WritableOptions {
    /**
     * Chunk splitter factory. The factory will be called when creating a new chunk.
     */
    readonly splitter: ChunkSplitterFactory;
    /**
     * Chunk sink. The sink will be called when creating a new chunk.
     */
    readonly sink: ChunkSink;
    readonly allowEmptyChunks?: boolean;
}
/**
 * Splits incoming data into chunks, writing them to the sink.
 */
export declare function chunkifier({ sink: streamFactory, ...options }: ChunkifierOptions): Writable;