export declare function toWeakSet<T, R, N, K extends object>(iterator: Iterator<T, R, N>, ...select: T extends object ? [] : [(value: T) => K]): WeakSet<K>;
export declare function toWeakSetAsync<T, R, N, K extends object>(iterator: AsyncIterator<T, R, N>, ...select: T extends object ? [] : [(value: T) => K]): Promise<WeakSet<K>>;
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