An ESnext spec-compliant Number.isInteger 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 @devtea2027/officiis-temporibus-facere-sit

console.log(Number.isInteger(-3)); // true
console.log(Number.isInteger(2 ** 54)); // true
console.log(Number.isInteger(2.3)); // false
console.log(Number.isInteger(Infinity)); // false
console.log(Number.isInteger("7")); // false

Clone the repo, npm install, and run npm test