/**
 * A function to start a download for a file.
 * @param {string} content The content of the file to download.
 * @param {string} fileName The name of the file to download.
 * @param {string | undefined} opt_fileType The type of the file to download.
 */
export default function download(content: string, fileName: string, opt_fileType: string | undefined): void;
