BigInteger.js: Arbitrary-Length Integers

BigInteger.js is a robust JavaScript library for performing arithmetic operations on integers of unlimited size, circumventing JavaScript's standard number precision limitations. The current stable version is 1.6.52. While releases are not on a fixed schedule, the project is actively maintained, with recent updates addressing various fixes and TypeScript definitions. A key differentiator and recent major change is its evolution into a polyfill for the native JavaScript `BigInt` feature (introduced to TC39 in 2018). If the execution environment supports native `BigInt`, this library will transparently wrap the native implementation, otherwise, it provides its own software-based arbitrary-length integer solution. This makes it a highly compatible choice for environments with varying `BigInt` support.