/**
 * Formats a file size in bytes into a human-readable string using appropriate units (bytes, kb, mb).
 *
 * @param {number} fileSizeInBytes - The size of the file in bytes.
 * @returns {string} The formatted file size as a string with the appropriate unit (bytes, kb, mb).
 *
 * @example
 * formatFileSize(500); // "500 bytes"
 * formatFileSize(2048); // "2 kb"
 * formatFileSize(10485760); // "10 mb"
 */
export declare const formatFileSize: (fileSizeInBytes: number) => string;