@numio/bigmath/src/toBase/toBase.js

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

import { s2bi } from "../shared/utils.js";
/** Convert number to another base */
export const toBase = ({ value, toBase }) => {
    const [bi] = s2bi(value);
    const isNegative = value[0] === "-";
    const map = {
        2: "0b",
        8: "0o",
        10: "",
        16: "0x",
    };
    return (isNegative ? "-" : "") + map[toBase] +
        (isNegative ? -1n * bi : bi).toString(toBase).toUpperCase();
};