/**
 * Write a string, like JSON stringify, to a local file. If used
 * in browser, download it instead.
 * @param content
 * @param fileName
 */
export declare function download(content: string, fileName: string): void;
/**
 * Read a local text file and returns its content as string.
 * @param filePath The path from the script to the file, e.g.
 *        `../../python/circles_human_pc1/circleHide_1664742992568.txt`
 */
export declare function loadFile(filePath: string): Promise<string>;