The ES2015 specification, also referred to as ES6, has been approved by ECMA International back in June 2015. In April 2016, Node.js Foundation team has released Node.js framework v6 supporting 93% of ES6 language features, thanks to V8 v5.0. It’s not hard to argue that having a JavaScript library written by using ES6+ syntax and existing language features instead of relying on 3rd party libraries