import { Comparator } from "../collections";
import { Transducer } from "./transducer";
import { DedupeTransducer } from "./dedupe";
export declare class UniqueTransducer<A> implements Transducer<A, A> {
    comparator: Comparator<A>;
    constructor(comparator: Comparator<A>);
    async_(iterable: AsyncIterable<A>): AsyncIterable<A>;
    sync(iterable: Iterable<A>): Iterable<A>;
}
export declare function unique<A>(comparator?: Comparator<A>): DedupeTransducer<A>;