import { IndexedDBStoreSchema } from "../models/IndexedDBStoreSchema";
export declare class HelperUtils {
    static getDatabaseVersion(dbName: string): Promise<number>;
    static getIndexedDBStoreSchemaPrimaryKeys(storeSchema: IndexedDBStoreSchema): string[];
    static promisifyIndexedDBRequest(request: IDBRequest, resolveMethod: string, rejectMethod?: string): Promise<any>;
}