/**
 * Loads the contents of a specified file.
 *
 * @param file - The file object to load contents from.
 * @param encoding - The encoding to use while reading the file. Default is UTF-8.
 *
 * @returns - A Promise that resolves with the contents of the file as a string.
 *          - If the file is empty, the Promise will be rejected with an error.
 */
export declare function loadFileContents(file: File, encoding?: string): Promise<string>;