/**
 * Converts bytes number to string representation (e.g. `15.25 GB`).
 *
 * @example
 * ```
 * formatBytes(1648 * 9884)
 * // '15.53 MB'
 * ```
 */
export declare function formatBytes(bytes: number, decimals?: number): string;
/**
 * Parses size string to bytes.
 *
 * @example
 * ```
 * parseSize('15.53 MB')
 * // 16288832
 * ```
 * @returns parsed bytes or `-1` on fail
 */
export declare function parseSize(value: string): number;
/**
 * Split the pathname path into a pair (root, ext) such that root + ext == path,
 * and ext is empty or begins with a period and contains at most one period.
 * Leading periods on the basename are ignored.
 *
 * @example
 * ```
 * getFileParts('file.txt')
 * // ['file', '.txt']
 *
 * getFileParts('.cshrc')
 * // ['.cshrc', '']
 * ```
 */
export declare function getFileParts(pathname: string): [string, string];
/**
 * Returns mime type from file name
 *
 * @example
 * ```
 * getMimeType('file.txt') // text/plain
 * getMimeType('file.unknown') // undefined
 * getMimeType('json') // application/json
 * ```
 */
export declare function getMimeType(name: string): string | undefined;
/**
 * Returns file extension from mime type
 *
 * @example
 * ```
 * getExtension('text/plain') // txt
 * getExtension('application/json') // json
 * getExtension('application/unknown') // undefined
 * ```
 */
export declare function getExtension(mimeType: string): string | undefined;