issues with Babel 6 and various parser issues

[ghost]

Hey, @pirxpilot @glasser @lautis @devongovett

I use let instead of var in my code. And end up with this issue:
stack: 'Error\n at new JS_Parse_Error (eval at <anonymous>

If I change it so Im using var, everything works just fine. Until it throws this:

JS_Parse_Error { message: 'Unexpected token punc «(», expected punc «:»', filename: 0,

I haven't managed to track down yet what cause this.

Any solutions? I was looking for other options then UglifyJS, but this seems to be the best tool.

I'm using this together with Rollup, and this option activated: fromString: true,

Any ideas what's going on? Or how to solve this?

[avdg]

All I can say now is that UglifyJS doesn't support Ecmascript 6/2015 yet and that the development of this specification is done on the harmony branch which is still under development.

So there are no features on master yet like let, const, destructured assignment,...

[ghost]

Ah okay. That explains it! Thanks :)

[coreybutler]

Any update on this? Webkit now has 100% ES2015 support (coming in Safari 10) and all of the major browsers natively support let/const now.

[avdg]

Please use the harmony branch (for let). The branch is still considered unstable and progress can be tracked on #448.

[avdg]

Uh, I would be interested in the bug on master as well. The master branch should normally be stable and bugs do get fixed if they are specified and given attention to.

[avdg]

Errors should normally indicate where it crashed, and mostly the bug should be caused at the position the error is given, or before.

[avdg]

Issue might be #1144, but uglify is strict 5.1 on master and we don't support older version or malformed outdated interpreters.

[alexlamsl]

Closing as duplicate of #448.