/**
 * Finds the absolute path to the `.atcoder-next/` directory by traversing upwards
 * from the starting directory (defaults to process.cwd()).
 *
 * @param startDir The directory to start searching from.
 * @returns The absolute path to the `.atcoder-next` directory.
 * @throws WorkspaceNotFoundError if the `.atcoder-next` directory is not found.
 */
export declare function findWorkspaceRoot(startDir?: string): string;