export default flatten;
export type ForEachCallback = (item: unknown) => void;
export type IterableLike = Iterable<unknown> | {
    forEach(cb: ForEachCallback): void;
};
/**
 * @callback ForEachCallback
 * @param {unknown} item
 * @return {void}
 */
/**
 * @typedef {Iterable<unknown> | { forEach(cb: ForEachCallback): void }} IterableLike
 */
/**
 * @return {import('stream').Transform} Transform
 */
declare function flatten(): import('stream').Transform;