@numio/bigmath/src/mod/mod.js

@numio/bigmath is an arbitrary-precision arithmetic library. It can be used for basic operations with decimal numbers (integers and float)

import { bi2s, s2bi } from "../shared/utils.js";
import { modInner } from "./utils.js";
export const mod = (left, right) => {
    const bil = s2bi(left);
    const bir = s2bi(right);
    if (bil[1] > 0)
        throw new Error(`${left} is not valid. It should be integer to take a modulo`);
    if (bir[1] > 0)
        throw new Error(`${right} is not valid. It should be integer to take a modulo`);
    return bi2s(modInner(bil, bir));
};