mathjs/src/plain/bignumber/index.js

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

import Decimal from 'decimal.js'

export * from './arithmetic'

// TODO: this is ugly. Instead, be able to pass your own isBigNumber function to typed?
const BigNumber = Decimal.clone()
BigNumber.prototype.isBigNumber = true

export function bignumber (x) {
  return new BigNumber(x)
}