import { Mapper } from '@naturalcycles/js-lib';
import { ReadableTyped } from './stream.model';
import { TransformMapOptions } from './transform/transformMap';
/**
 * Run Mapper for each of the stream items, respecting backpressure.
 */
export declare function streamForEach<IN>(stream: ReadableTyped<IN>, mapper: Mapper<IN, void>, opt?: TransformMapOptions): Promise<void>;