import { NullableString } from "../types.js";
/**
 * 是否为空字符串
 *
 * @since 0.0.1
 * @param [str]           字符串
 * @param [trim=false]    是否String#trim()
 * @returns {boolean}     是否为空字符串
 */
declare function isEmpty(str: NullableString, trim?: boolean): boolean;
export { isEmpty };