Nuevo releaseSep 3, 2026
Cybersecurity-Handbook v2.0
Open-source cybersecurity knowledge base with 400+ notes, labs, and cheat sheets covering offense, defense, cryptography, cloud, and forensics.
es-define-property 
Object.defineProperty, but not IE 8's broken one.
Example
const assert = require('assert');
const $defineProperty = require('es-define-property');
if ($defineProperty) {
assert.equal($defineProperty, Object.defineProperty);
} else if (Object.defineProperty) {
assert.equal($defineProperty, false, 'this is IE 8');
} else {
assert.equal($defineProperty, false, 'this is an ES3 engine');
}
Tests
Simply clone the repo, npm install, and run npm test
Security
Please email @ljharb or see https://tidelift.com/security if you have a potential security vulnerability to report.