import { CacheOptions } from '../models/CacheOptions';
import { ExpirationCallback } from '../types';
export declare class Cache<K, T> {
    private options;
    private cache;
    constructor(options?: CacheOptions);
    set(key: K, value: T, ttl?: number, callback?: ExpirationCallback<T>): Cache<K, T>;
    /**
     * Returns value by its key
     *
     * @param key Key of value to get
     * @param refresh True to refresh item TTL or false to not
     */
    get(key: K, refresh?: boolean): T | undefined;
    /**
     * Takes value by its key from cache.
     *
     * Value is returned and key is removed from cache.
     *
     * @param key Key to take
     * @returns Value of specified key
     */
    take(key: K): T | undefined;
    has(key: K): boolean;
    delete(key: K): boolean;
    mdelete(keys: K[]): Cache<K, T>;
    get size(): number;
    forEach(cb: (value: T, key: K) => void): void;
    private cleanup;
    flush(invokeCallback?: boolean): void;
}