/**
 * Similar to WeakMap, but values are weakly referenced instead of keys.
 */
export declare class InvertedWeakMap<K extends string | symbol, V extends object> {
    private _map;
    private _registry;
    constructor();
    set(key: K, value: V): void;
    get(key: K): V | undefined;
    has(key: K): boolean;
}