/**
 * Check if a string is a URL
 * @param str String to check
 * @returns true if the string is a valid URL
 */
export declare function isUrl(str: string): boolean;
/**
 * Fetch data from a URL and return as Buffer
 * @param url URL to fetch
 * @returns Buffer containing the fetched data
 */
export declare function fetchBuffer(url: string): Promise<Buffer>;
/**
 * Create a directory
 * @param dir Directory path
 * @param recursive Create parent directories if they don't exist
 */
export declare function createDir(dir: string, recursive?: boolean): Promise<void>;
/**
 * Write a file
 * @param dir Directory path
 * @param filename Filename
 * @param data Data to write
 * @returns Path to the file
 */
export declare function writeFile(dir: string, filename: string, data: string | Buffer): Promise<string>;
/**
 * Read a JSON from file or URL and return its content
 * @param source Path to the file or URL
 * @returns Parsed JSON content
 */
export declare function loadJson<T>(source: string): Promise<T>;
/**
 * Load data from a file or URL and return as Buffer
 * @param source Path to the file or URL
 * @returns Content as Buffer
 */
export declare function loadBuffer(source: string): Promise<Buffer>;
/**
 * Get the filename without the extension
 * @param filePath Path to the file
 * @returns Filename without the extension
 */
export declare function fileNameWithoutExtension(filePath: string): string;