Arrow methods

[oskarkrawczyk]

This has been risen by one of our users over at jsfiddle/jsfiddle-users#1457

Apparently this is valid syntax:

class Bar {
   someMethod = () => {
   }
}

Which will throw errors and warnings in the current JSHint version.

More details:

• https://github.com/tc39/proposal-class-fields
• https://github.com/tc39/proposal-class-fields#execution-of-initializer-expressions

[jugglinmike]

I take it your users aren't writing code for Firefox ;)

In any event, the proposal has reached stage 3, which is well beyond JSHint's criteria for maturity. That means we're on the hook for supporting it. We have a tracking issue for that, but it referenced the proposal by an outdated name. I've fixed that, so I'd like to continue to use that issue to track implementation:

#3139

Can't say when I'll have time to implement it, but I'll be happy to guide anyone who wants to land a hand.

Thanks for taking the time to report this, Oskar!