I’m not sure it’s okay to reply on this very old thread, but if I’m
understanding correctly the desugared code can be fairly short with new
Object.getOwnPropertyDescriptors:
```js
function partial(base, extension) {
extension.prototype.__proto__ = base.prototype.__proto__; // to enable
'super' reference
const descriptors = Object.getOwnPropertyDescriptors(extension.prototype);
delete descriptors.constructor; // must not override constructor
Object.defineProperties(base.prototype, descriptors);
return base;
}
```
```
class A {
foo() {
return "foo"
}
}
class B extends A {
}
partial(B, class {
foobar() {
return `${super.foo()}bar`;
}
})
output.value = new B().foobar(); // will be “foobar;
```
This sample currently only works on Firefox 50+. https://jsfiddle.net/v8bbvavv/
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