export declare class LRUCache<TKey, TValue> {
    private _maxSize;
    private _cacheMap;
    constructor(_maxSize?: number);
    set(key: TKey, value: TValue): void;
    get(key: TKey): NonNullable<TValue> | undefined;
    has(key: TKey): boolean;
    delete(key: TKey): void;
}