Since we required methods defined within class definitions non-enumerable by default, I think we should discourage people to do things like:

class Foo { … }
bar = () => {}
Foo.prototype.bar = bar;
Foo.prototype.addtionalMethod = () => {}

Maybe two new syntaxes could be allowed in es7?

class Foo {
	...
	bar: bar
}

partial class Foo {
	addtionalMethod() {}
}

The first allows adding an existing function to a new class. The second allows adding a new method to an existing class. The first syntax probably needs a bit work though, because I see there were some discussions about supporting prototypal properties, and if these properties should be enumerable by default, we probably need different syntaxes for adding properties and methods.

These two should cover the most use cases for Object.defineProperty and Object.defineProperties (which are too verbose to encourage people to use I believe).

What do you think?

Since we required methods defined within class definitions non-enumerable by default, I think we should discourage people to do things like:

```js
class Foo { … }
bar = () => {}

Foo.prototype.bar = bar;
Foo.prototype.addtionalMethod = () => {}
```

Maybe two new syntaxes could be allowed in es7?

```js
class Foo {
	...
	bar: bar
}

partial class Foo {
	addtionalMethod() {}
}
```

The first allows adding an existing function to a new class. The second allows adding a new method to an existing class. The first syntax probably needs a bit work though, because I see there were some discussions about supporting prototypal properties, and if these properties should be enumerable by default, we probably need different syntaxes for adding properties and methods.

These two should cover the most use cases for Object.defineProperty and Object.defineProperties (which are too verbose to encourage people to use I believe).

What do you think?