mixin members not present in output

[thepassle]

Given the following code:

const MyMixin = (klass: any) => class MyMixin extends klass {
    myFoo: string = "foo";
}

export class CustomElement extends MyMixin(MySuperClass) {
// etc
}

I'd expect the myFoo field to be in the output for the CustomElement ClassDoc custom-elements.json, but it's not

[web-padawan]

See also #135