export declare class PairSet<K, V> {
    private readonly _keys;
    private readonly _values;
    add(key: K, value: V): void;
    delete(key: K, value: V): void;
    setKey(key: K, values: Iterable<V>): void;
    deleteKey(key: K): void;
    hasValue(value: V): boolean;
    getAnyKey(value: V): K | undefined;
}