import Asset, { AssetId } from './Asset';
import { AssetType } from './AssetType';
import { DataFormat } from './DataFormat';
import { ScratchStorage } from './ScratchStorage';
/**
 * Base class for asset load/save helpers.
 * @abstract
 */
export default class Helper {
    parent: ScratchStorage;
    constructor(parent: ScratchStorage);
    /**
     * Fetch an asset but don't process dependencies.
     * @param {AssetType} assetType - The type of asset to fetch.
     * @param {string} assetId - The ID of the asset to fetch: a project ID, MD5, etc.
     * @param {DataFormat} dataFormat - The file format / file extension of the asset to fetch: PNG, JPG, etc.
     * @returns {Promise.<Asset>} A promise for the contents of the asset.
     */
    load(assetType: AssetType, assetId: AssetId, dataFormat: DataFormat): Promise<Asset | null> | null;
}