Harmony support

[ozanmakes]

I'm trying to use the excellent livenode with a project which uses ES6 features introduced in node v11, but unfortunately UglifyJS's parser chokes when it encounters a let statement or a generator function (function *() { yield true }).

[kevyworks]

Any comment on this?

[mgol]

That would be great to have, ES6 brings a lot of important new features but minification of all of them is still needed.

[Martii]

+1

[maranomynet]

+1

[darky]

👍

[ben-eb]

+1

[kevinjalbert]

👍 just got bit by for...of.

If harmony support were enabled, we could also safely convert functions that don't use this to use the => syntax as well.

[fabiosantoscode]

+1 -- I'm writing a game for future browsers so I don't want to add the overhead of traceur to my code.

I also think converting functions to arrows when this is not used would be pretty nice.