/** Alias for Set.prototype.add */
export declare const AddSymbol: unique symbol;
/** Alias for Set.prototype.has */
export declare const HasSymbol: unique symbol;
/** Set instance enriched with aliased methods that cannot be poisoned */
export type PoisoningFreeSet<K> = Set<K> & {
    [AddSymbol]: (key: K) => Set<K>;
    [HasSymbol]: (key: K) => boolean;
};
/** Factory responsible to build instances of PoisoningFreeMap */
export declare const PoisoningFreeSet: {
    from<K>(ins?: readonly K[] | Iterable<K> | null): PoisoningFreeSet<K>;
};