/**
 * Checks if a file exists.
 * Analogous to the os.path.exists function from Python.
 * @param fs The filesystem to use.
 * @param path The path to the file to check.
 * @returns A promise that resolves to true if the file exists, false otherwise.
 */
export declare function exists(path: string): Promise<boolean>;
/**
 * Recursively traverses a directory and yields all the paths to the files in it.
 * @param dirPath The path to the directory to traverse.
 */
export declare function walk(dirPath: string): AsyncIterable<string>;