/**
 * @typedef {Object} StoreRecord
 * @property {number} expiresAt
 * @property {Record<string, unknown>} [metadata]
 *
 * @typedef {Object} MarkUsedResult
 * @property {boolean} swapped       true if this call stamped usedAt (was null before)
 * @property {StoreRecord} record    the record after the operation
 *
 * @typedef {Object} Store
 * @property {(key: string, expiresAt: number, metadata?: Record<string, unknown>) => Promise<void>} add
 * @property {(key: string) => Promise<boolean>} has
 * @property {(key: string) => Promise<StoreRecord | null>} get
 * @property {(key: string) => Promise<void>} delete
 * @property {(filter: Record<string, unknown>) => Promise<number>} deleteAll
 * @property {(key: string, nowSec: number) => Promise<MarkUsedResult | null>} [markUsed]
 * @property {() => number} size
 * @property {() => void} _stop
 *
 * @typedef {Object} MemoryConfig
 * @property {number} [maxSize]
 * @property {{ strategy?: 'interval' | 'lazy' | 'lru', interval?: string | number, maxSize?: number }} [gc]
 */
/**
 * @param {MemoryConfig} [options]
 * @returns {Store}
 */
export function createMemoryStore(options?: MemoryConfig): Store;
export type StoreRecord = {
    expiresAt: number;
    metadata?: Record<string, unknown> | undefined;
};
export type MarkUsedResult = {
    /**
     * true if this call stamped usedAt (was null before)
     */
    swapped: boolean;
    /**
     * the record after the operation
     */
    record: StoreRecord;
};
export type Store = {
    add: (key: string, expiresAt: number, metadata?: Record<string, unknown>) => Promise<void>;
    has: (key: string) => Promise<boolean>;
    get: (key: string) => Promise<StoreRecord | null>;
    delete: (key: string) => Promise<void>;
    deleteAll: (filter: Record<string, unknown>) => Promise<number>;
    markUsed?: ((key: string, nowSec: number) => Promise<MarkUsedResult | null>) | undefined;
    size: () => number;
    _stop: () => void;
};
export type MemoryConfig = {
    maxSize?: number | undefined;
    gc?: {
        strategy?: "interval" | "lazy" | "lru";
        interval?: string | number;
        maxSize?: number;
    } | undefined;
};