import type { Awaitable } from "./Awaitable";
/** uniq by a new Set(), note: use === to compare */
export declare const uniqs: <T>() => TransformStream<T, T>;
/** uniq by a new Map(), Note: use === to compare keys */
export declare const uniqBys: <T, K>(keyFn: (x: T) => Awaitable<K>) => TransformStream<T, T>;