import { AsyncMapper } from '@naturalcycles/js-lib';
import { TransformMapOptions } from '../..';
import { WritableTyped } from '../stream.model';
/**
 * Just an alias to transformMap that declares OUT as void.
 */
export declare function writableForEach<IN = any>(mapper: AsyncMapper<IN, void>, opt?: TransformMapOptions<IN, void>): WritableTyped<IN>;