import { CacheProvider } from './cacheProvider';
/**
 * In-memory Least Recently Used (LRU) cache.
 */
export declare class LruCache<T = any> implements CacheProvider<string, T> {
    private cache;
    private readonly capacity;
    private constructor();
    /**
     * Initializes a new instance with the given capacity.
     *
     * @param {number} capacity The maximum number of entries in the cache. Must be a
     *      positive safe integer.
     */
    static ofCapacity(capacity: number): LruCache;
    get(key: string, loader: (key: string) => Promise<T>): Promise<T>;
    set(key: string, value: T): Promise<void>;
    delete(key: string): Promise<void>;
    private prune;
}