import { StorageValue } from 'unstorage';
import { Cache, TransactionOptions } from '../../Cache';
export declare class MemoizedCache<T extends StorageValue, K = T> {
    private readonly key;
    private readonly opts;
    private readonly transform;
    private readonly ttl;
    private readonly fetch;
    private fetchPromise;
    private item;
    private lastUpdate;
    constructor(key: string, opts: TransactionOptions, transform?: (i: T | undefined) => K, ttl?: number, fetch?: () => Promise<T>);
    getItem: (cache: Cache) => Promise<K>;
}