export declare function opUniqueAsync<T, U>(k?: (v: T) => U): (iter: AsyncIterable<T>) => AsyncIterable<T>;
export declare function opUniqueSync<T, U>(k?: (v: T) => U): (iter: Iterable<T>) => Iterable<T>;
export declare const opUnique: <T, U = T>(getKey?: ((v: T) => U) | undefined) => import("../internalTypes").PipeFn<T, T>;
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