1. ECMAScript 2015 (ES6)

    Support for the ECMAScript 2015 specification. Features include Promises, Modules, Classes, Template Literals, Arrow Functions, Let and Const, Default Parameters, Generators, Destructuring Assignment, Rest & Spread, Map/Set & WeakMap/WeakSet and many more.

  2. javascript operator: object initializer: spread properties

  3. javascript operator: spread syntax (...): spread in object literals

  4. ecmascript 2018 (es9)