declare class LRUCache<K extends string | number, T> {
    private readonly max;
    private readonly unusedTimeout?;
    private readonly checkoutInterval?;
    private readonly cacheMap;
    private readonly isAutoClear;
    private firstFrame;
    private lastFrame;
    private interval;
    constructor(max?: number, unusedTimeout?: number | undefined, checkoutInterval?: number | undefined);
    get(key: K): T | null;
    set(key: K, entry: T): void;
    delete(key: K): boolean;
    clear(): void;
    private setInterval;
    private clearUnused;
}
export = LRUCache;