/**
 * Converts a string to lowercase.
 *
 * @since 1.0.0
 *
 * @param {string} str - The string to convert to lowercase.
 * @returns {string} - The lowercase string.
 *
 * @example
 * toLower('Hello World'); // 'hello world'
 */
declare const toLower: (str?: string) => string;
export default toLower;