/**
 * 非空数组join with ' '
 * @param arrays 待join的字符串数组
 */
export declare function notEmptyArrayJoinWith(spliter?: string, ...arrays: string[]): string;
/**
 * 判断某个对象是否不含任何实际可用值
 * @param value 对象
 * @param whiteKeys 顶层对象的白名单key
 */
export declare function isEmptyValue(value: any, whiteKeys?: string[]): boolean;
export declare function capitalizeFirstLetter(words: string): string;