import BigNumber from 'bignumber.js';
/**
 * 将数字转换为千分位显示
 */
export declare function numWithCommas(num: number | BigNumber | string, decimal?: number): string;
/**
 * 将数字保留小数点后n位（默认截断）
 */
export declare function toFixed(number: number | string | BigNumber | undefined, decimal?: number, roundMode?: BigNumber.RoundingMode): BigNumber;
/**
 * 将数字转换为千分位显示，并保留小数点后n位（默认截断）
 */
export declare function toFixedWithCommas(number: number | string | BigNumber | undefined, decimal?: number, roundMode?: BigNumber.RoundingMode): string;
/**
 * 将数字转换为非指数形式
 * @param amount 数字
 * @param decimal 小数位数
 * @returns 非指数形式的字符串
 */
export declare function toNonExponential(amount: number, decimal?: number): string;