import { IModels } from '@accordproject/concerto-metamodel';
/**
 * Downloads all ModelFiles that are external dependencies and adds or
 * updates them in this ModelManager.
 * @param {*} models - the AST for all the known models
 * @param {Object} [options] - Options object passed to ModelFileLoaders
 * @param {FileDownloader} [fileDownloader] - an optional FileDownloader
 * @throws {IllegalModelException} if the models fail validation
 * @return {Promise} a promise when the download and update operation is completed.
 */
declare function resolveExternal(models: IModels, options?: any, fileDownloader?: any): Promise<IModels>;
/**
 * Creates a default file downloader
 * @return {FileDownloader} a default file downloader instance
 */
declare function createDefaultFileDownloader(): any;
declare const _default: {
    resolveExternal: typeof resolveExternal;
    createDefaultFileDownloader: typeof createDefaultFileDownloader;
};
export = _default;