export interface CacheStats {
    size: number;
}
export declare class Cache<K, V> {
    private cache;
    get(key: K): V | undefined;
    has(key: K): boolean;
    set(key: K, value: V): void;
    delete(key: K): boolean;
    clear(): void;
    get size(): number;
    keys(): K[];
    getStats(): CacheStats;
}