import type { MaybePromise } from '../types.js';
export type Entry<T> = {
    readonly value: T;
    /** Is undefined when endless (unspecified ttl) */
    readonly until: number | undefined;
};
export declare function createEntry<T>(value: T, ttl: number | undefined, now?: number): Entry<T>;
export declare function cleanupOld<K extends string, V>(map: Readonly<ReadonlyMap<K, Entry<V>>>, deleteFunction: (key: K) => MaybePromise<boolean>, now?: number): Promise<void>;