/**
 * Formats a byte count as short, localised, readable text — `999B`, `1.5kB`,
 * `1.2MB` — for a FileUpload file row.
 *
 * @param bytes - A `File.size`, in bytes.
 * @param locale - BCP 47 tag, or omitted for the runtime's own locale.
 * @returns The formatted size, e.g. `'1.5kB'`.
 */
export declare function formatFileSize(bytes: number, locale?: string): string;