README.md

Number.isSafeInteger

An ESnext spec-compliant Number.isSafeInteger 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.

Getting started

npm install --save number.issafeinteger

Usage/Examples

console.log(Number.isSafeInteger(-3)); // true
console.log(Number.isSafeInteger(2 ** 53)); // false
console.log(Number.isSafeInteger(2 ** 53 - 1)); // true
console.log(Number.isSafeInteger("7")); // false

Tests

Clone the repo, npm install, and run npm test