Property getters and setters

[Elberet]

ES6 defines classes with property getters / setters:

class Dummy {
  get thing() { return this._thing }
  set thing(value) { this._thing = value }
}

Unfortunately, classes handled by the UI5 transformation are missing out on a lot of Babel's class features (see e.g. #23), and getters/setters are among those. The plugin produces a class declaration such as this:

var Dummy = ManagedObject.extend("dummy.Dummy", {
  // ...
  get thing() { /* ... */ },
}

There are two problems with this:

1. This won't work with IE11. Babel's preset-env handles getters/setters in normal ES6 classes, but fails to fix this; ordering of presets in the Babel config doesn't affect the result.
2. UI5 will iterate over all properties of the object given to extend which "accidentally" triggers execution of the getter with this being the aforementioned object instead of an instance of the class.

Would it be possible to change the UI5 transformation so that it only creates a skeleton class through UI5's .extend with the metadata, renderer and constructor set, and delegates creation/declaration of everything else to the usual Babel mechanisms?