Why can't I use currencies with bigint?

Currencies from dinero.js/currencies have number values for base and exponent:

// From dinero.js/currencies
const USD = { code: 'USD', base: 10, exponent: 2 };

When using dinero.js/bigint, all arithmetic operations use bigint math. JavaScript doesn't allow mixing number and bigint in operations—it throws a TypeError:

10n + 2  // TypeError: can't convert BigInt to number

This is a JavaScript language constraint. To use the bigint variant, import currencies from dinero.js/bigint/currencies instead:

import { dinero } from 'dinero.js/bigint';
import { USD } from 'dinero.js/bigint/currencies';

const d = dinero({ amount: 500n, currency: USD });

These currencies have bigint values for base and exponent:

// From dinero.js/bigint/currencies
const USD = { code: 'USD', base: 10n, exponent: 2n };

See the Precision and large numbers guide for more on when to use bigint.