import { CacheMessageItem } from '../harbor/base';
export type UploadArgs = {
    url: string;
    body?: FormData;
};
export type DownloadArgs = {
    data: any;
    customDownload?: (data: CacheMessageItem[]) => void;
    filename: () => string;
};
export declare const startUpload: ({ url, body }: UploadArgs) => Promise<H.UploadResult<H.SingleLog | H.GroupLog> | null>;
export declare const startDownload: ({ data, filename, customDownload, }: DownloadArgs) => Promise<void>;