Properties for class methods are not set properly

[ClassicOldSong]

ES6 classes methods should not be enumerable, but code transpiled with buble got these methods enumerable.

Things like

class aaa {
  bbb() {}
}

should be transpiled into:

var aaa = function aaa () {};

aaa.prototype.bbb = function bbb () {};
Object.defineProperty(aaa.prototype, 'bbb', {enumerable: false})

But the last line doesn't exist. So when trying to traversing the instance of class aaa will get bbb included, but it shouldn't appear. Hope this could be fixed soon.

[ClassicOldSong]

Workaround for this could be

class aaa {
  bbb() {}
}

Object.defineProperty(aaa.prototype, 'bbb', {enumerable: false})

[mourner]

Thanks for the report! Babel seems to respect enumerable: false here, but TypeScript curiously [transpiles in the same way](https://www.typescriptlang.org/play/#src=class%20A%20%7B%20b()%20%7B%7D%20%7D%0D%0A) as Buble currently. I wonder if this is an accepted tradeoff — e.g. could there be a performance implication to using defineProperty?

[ClassicOldSong]

There shouldn't be performance issues with defineProperty since setting the property is done while defining the class. Maybe we could file up the same bug report to TypeScript.

[ClassicOldSong]

Okay there's already an issue for TypeScript: https://github.com/Microsoft/TypeScript/issues/15038