export declare class WeakRefMap<K, V extends object> implements Map<K, V> {
    #private;
    constructor(values?: readonly [K, V][]);
    set(key: K, value: V): this;
    get(key: K): V | undefined;
    readonly [Symbol.toStringTag]: string;
    get size(): number;
    [Symbol.iterator](): IterableIterator<[K, V]>;
    clear(): void;
    delete(key: K): boolean;
    entries(): IterableIterator<[K, V]>;
    forEach(fn: (value: V, key: K, map: WeakRefMap<K, V>) => void, thisArg?: any): void;
    has(key: K): boolean;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
}