/**
 * A map where the keys are weakly held and the values are a Set that are also each weakly held.
 * The goal is to avoid leaking the values, which is what would happen with a WeakMap<K, Set<V>>.
 *
 * Note that this is currently only intended to be used in dev/PRODDEBUG environments.
 *
 * This implementation relies on WeakRefs and FinalizationRegistry.
 * For some background, see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakRef
 */
export declare class WeakMultiMap<K extends object, V extends object> {
    private _map;
    private _registry;
    private _getWeakRefs;
    get(key: K): ReadonlySet<V>;
    add(key: K, value: V): void;
    delete(key: K): void;
}
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