/**
 * 字符串格式化
 * ```
 * format('this is ${name}', { name: 'asdf' })
 * // output: this is asdf
 * format('this is ${user.name}', { user: { name: 'asdf' } }, true)
 * // output: this is asdf
 * ```
 */
export declare function format(str: string, obj: {}, needDeepGet?: boolean): string;
/**
 * 转化成RMB元字符串
 * @param digits 当数字类型时，允许指定小数点后数字的个数，默认2位小数
 */
export declare function yuan(value: any, digits?: number): string;