export declare class AbmBiMap<K, V> {
    private kv;
    private vk;
    get size(): number;
    set(key: K, value: V): V;
    getFromKey(key: K): V;
    getFromValue(val: V): K;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    isEmpty(): boolean;
    kvEntries(): IterableIterator<[K, V]>;
    vkEntries(): IterableIterator<[V, K]>;
    deleteFromKey(key: K): boolean;
    deleteFromValue(val: V): boolean;
}