/**
 * @typedef {object} MemoryStoreOptions
 * @property {number} [maxKeys=10000]   Hard cap; oldest entry dropped when exceeded.
 * @property {number} [sweepMs=60000]   Interval for the background TTL sweep.
 */
/**
 * @param {MemoryStoreOptions} [options]
 * @returns {import('./index.js').IncrStore & { _size: () => number, _stop: () => void }}
 */
export function memoryStore(options?: MemoryStoreOptions): import("./index.js").IncrStore & {
    _size: () => number;
    _stop: () => void;
};
export type MemoryStoreOptions = {
    /**
     * Hard cap; oldest entry dropped when exceeded.
     */
    maxKeys?: number | undefined;
    /**
     * Interval for the background TTL sweep.
     */
    sweepMs?: number | undefined;
};