ES+6

ECMAScript (/ˈɛkməskrɪpt/) (or ES)[1] is a JavaScript standard meant to ensure the interoperability of web pages across different web browsers

The 6th edition, ECMAScript 6 (ES6) and later renamed to ECMAScript 2015, was finalised in June 2015.[11][32] This update adds significant new syntax for writing complex applications, including class declarations (class Foo { ... }), ES6 modules like import * as moduleName from "..."; export const Foo, but defines them semantically in the same terms as ECMAScript 5 strict mode.