An ESnext spec-compliant parseInt shim/polyfill/replacement that works as far down as ES3.

This package implements the es-shim API interface. It works in an ES3-supported environment and complies with the spec.

npm install --save parseint

console.log(parseInt("-3")); // -3
console.log(parseInt("0x10")); // 16
console.log(parseInt("30", 7)); // 21
console.log(parseInt("ef")); // NaN

Clone the repo, npm install, and run npm test