export type HashMapComparator<K> = (lhs: K, rhs: K) => boolean;
export declare class HashMap<K1, K2, V> {
    private readonly comparator;
    constructor(comparator: HashMapComparator<K2>);
    private storage;
    get(key1: K1, key2: K2): V | undefined;
    set(key1: K1, key2: K2, value: V): void;
    delete(key1: K1, key2: K2): boolean;
    [Symbol.iterator](): IterableIterator<[K1, K2, V]>;
}