ECMAScript:Harmony / ES6 to JavaScript compiler

Question

After reading Peter\'s article on JavaScript I noticed

Brendan Eich stated that one the goals for Harmony is to be a better target for to-JavaScript c

Answer 1

As of the time of typing, we now have Babel. It integrates with many different build tools/systems, and will transpile ES6+ in order to support legacy browsers (it doesn't state which version it targets, but it does say that it targets IE9+).

To install it type npm install babel -g.

Note that it has rather a lot of dependencies and when installed it is ~23.4 MB (2888 files).