Nested ES6 classes?

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No, there are no nested classes in ES6, and there is no such thing as private members in the class syntax anyway if you mean that.

Of course you can put a second class as a static property on another class, like this:

class A {
    …
}
A.B = class {
    …
};

or you use an extra scope:

var C;
{
    class D {
        constructor() { }
    }
    C = class C {
        constructor() { }
        method() {
            var a = new D();  // works fine
        }
    }
}

(There seems to be a bug with traceur as it uses a hoisted var for the class declaration instead of block scope)

With the proposed class field syntax, it will also be possible to write a single expression or declaration:

class A {
    …
    static B = class {
         …
    }
};

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