import type { PositiveInteger } from '@naturalcycles/js-lib/types';
import type { TransformOptions, TransformTyped } from '../stream.model.js';
/**
 * Similar to RxJS bufferCount(),
 * allows to "chunk" the input stream into chunks of `opt.chunkSize` size.
 * Last chunk will contain the remaining items, possibly less than chunkSize.
 *
 * `chunkSize` indicates how many items to include in each chunk.
 * Last chunk will contain the remaining items, possibly less than chunkSize.
 */
export declare function transformChunk<IN = any>(chunkSize: PositiveInteger, opt?: TransformOptions): TransformTyped<IN, IN[]>;