import { StorageStrategy } from "./StorageStrategy";
declare class StorageEngine {
    private storages;
    private storedKeys;
    constructor(storages: StorageStrategy[]);
    store(key: string, data: string): void;
    retrieve(key: string, validator?: (data: string) => boolean): string | undefined;
    private searchInAllStorages;
    private storeInAllStorages;
    private setKeyInUse;
    startUpdateInterval(interval: number): void;
}
export default StorageEngine;