ECMAScript6

Status of ES6 support in Closure Compiler

Introduction

There are major changes in store for EcmaScript 6 and will require major changes to Closure Compiler to support it.

This is a place to collect changes that will need to be made to the compiler.

Overview

Summary: https://github.com/lukehoban/es6features

Spec: http://people.mozilla.org/~jorendorff/es6-draft.html

Details

Parser

The new parser is in place, and will be enabled by default in the next release (probably in May). It already parses a lot of the new ES6 syntax, and we plan to be able to parse nearly all of ES6 by the end of Q2 2014.

Type Checking

Optimizations

Code Printer

In progress.