import { AsyncMemoCache, MISS, NumberOfSeconds } from '@naturalcycles/js-lib';
import { CommonKeyValueDao } from './commonKeyValueDao';
export interface CommonKeyValueDaoMemoCacheCfg<VALUE> {
    dao: CommonKeyValueDao<string, VALUE>;
    /**
     * If set, every `set()` will set `expireAt` (TTL) option.
     */
    ttl?: NumberOfSeconds;
}
/**
 * AsyncMemoCache implementation, backed by CommonKeyValueDao.
 *
 * Does NOT support persisting Errors, skips them instead.
 *
 * Also, does not support .clear(), as it's more dangerous than useful to actually
 * clear the whole table/cache.
 */
export declare class CommonKeyValueDaoMemoCache<VALUE> implements AsyncMemoCache<string, VALUE> {
    private cfg;
    constructor(cfg: CommonKeyValueDaoMemoCacheCfg<VALUE>);
    get(k: string): Promise<VALUE | typeof MISS>;
    set(k: string, v: VALUE): Promise<void>;
    clear(): Promise<void>;
}