Support for ES6?

I've noticed that some of the ES6 features that my colleagues have been using are marked as syntax errors; for example, the keyword let or arrow function syntax =>.

Is ES6 currently supported and if so, how do I enable it in my test configuration file? If I try uncommenting the default configuration line for default-type and setting a JavaScript version number, I get this warning in the output:

warning: Unrecognized setting: default-type

[matthiasmiller]

jsl doesn't support it, unfortunately, but pull requests are welcome! :-)

Thanks. Thought I'd ask seeing as all the major browsers now support it.

I'd love to help out with adding this functionality, but it could be a long time before I have a chance to even look at it!