/**
 * TTL (Time to Life) Map
 *
 * it will lazy remove values when perform operations
 *
 * @category Functional
 * @since 5.18.0
 */
export declare class TTLMap<K = any, V = any> extends Map<K, V> {
    /**
     * TTLMap (Time to Life) Map
     *
     * it will lazy remove values when perform operations
     *
     * @param defaultTTL time to live, in milliseconds, default value is 60 seconds
     * @param cleanAfterOperation execute full clean after operations. default value is 100, it means, at least 100 operations performed, the TTL evict logic will be executed
     */
    constructor(defaultTTL?: number, cleanAfterOperation?: number);
    /**
     * default TTL value in milliseconds
     */
    private defaultTTL;
    private cleanAfterOperation;
    private operationCount;
    private timeoutStorage;
    private timestamp;
    /**
     * _checkAndClean
     *
     * for the simple operations (set/get/delete/has), the clean operation will not execute every time
     */
    private _checkAndClean;
    /**
     * set value
     *
     * @param k key
     * @param v value
     * @param ttl time to live, in milliseconds, if undefined, will use instance level defaultTTL
     * @returns
     */
    set(k: K, v: V, ttl?: number): this;
    has(k: K): boolean;
    get(k: K): V | undefined;
    delete(k: K): boolean;
    clear(): void;
    /**
     * return true if timeout
     *
     * @param k
     */
    private checkTimeout;
    private getTimeout;
    /**
     * manually directly clean all timeout items
     */
    cleanTimeoutItems(): void;
    entries(): IterableIterator<[K, V]>;
    keys(): IterableIterator<K>;
    values(): IterableIterator<V>;
    forEach(callbackfn: (value: V, key: K, map: Map<K, V>) => void, thisArg?: any): void;
    get size(): number;
}
export default TTLMap;