export declare class MapAssertable<K, V> extends Map<K, V> {
    #private;
    /**
     * Ensures the key exists in the map, creating it with the factory if needed, and increments its usage counter.
     */
    assert(key: K, factory: () => V): V;
    /**
     * Stores a factory that will be called lazily on first `get()`.
     * If the entry is released before being accessed, the factory is never invoked.
     */
    setLazy(key: K, factory: () => V): void;
    get(key: K): V | undefined;
    has(key: K): boolean;
    delete(key: K): boolean;
    /**
     * Decrements the usage counter for the key and removes it from the map if no longer used.
     */
    release(key: K): void;
}