Decorators

ECMAScript Decorators are an in-progress proposal for extending JavaScript classes. Decorators use a special syntax, prefixed with an `@` symbol and placed immediately before the code being extended.

ECMAScript 5

Full support for the ECMAScript 5 specification. Features include `Function.prototype.bind`, Array methods like `indexOf`, `forEach`, `map` & `filter`, Object methods like `defineProperty`, `create` & `keys`, the `trim` method on Strings and many more.

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.

Object.entries

The `Object.entries()` method creates a multi-dimensional array of key value pairs from the given object.

Object.observe data binding

Method for data binding, a now-withdrawn ECMAScript 7 proposal

ECMAScript 5 Strict Mode

Method of placing code in a "strict" operating context.

serviceworker api: support for ecmascript modules

sharedworker api: `sharedworker()` constructor: support for ecmascript modules

worker api: `worker()` constructor: support for ecmascript modules

worklet api: support for ecmascript modules

ecmascript 3

ecmascript 2016 (es7)

ecmascript 2017 (es8)

ecmascript 2018 (es9)

ecmascript 2019 (es10)

ecmascript 2020 (es11)

ecmascript 2021 (es12)

ecmascript 2022 (es13)

ecmascript 4