import { NullableString } from "../types.js";
/**
 * 驼峰风格转下划线风格字符串
 *
 * @since 0.0.1
 * @param [str]                 驼峰风格字符串
 * @returns {NullableString}    下划线风格字符串
 */
declare function hump2underline(str: NullableString): NullableString;
export { hump2underline };