Ember 3.2 + ember-decorators subclassing bug

@bartocc wrote:

While migrating a 3.1.4 project to 3.2, I ran into the following error:

Class constructor A cannot be invoked without 'new'.

The project has 2 models, A and B, defined with ES6 class/extends syntax thanks to ember-decorators.

// models/a.js
import DS from 'ember-data';

export default class A extends DS.Model {
}

// models/b.js
import A from './a';

// I need A.extend() here for polymorphic relationship reasons
export default class B extends A.extend() {
}

This code works under 3.1.4 but fails under 3.2 and I do not understand why.

The workaround I’ve found is to define A with EmberObject.extend() instead of using ES6 class syntax.

// models/a.js
import DS from 'ember-data';

// this works under 3.1 and 3.2
export default DS.Model.extend({});

Another way to fix the issue is to define B like this

// models/b.js
import A from './a';

// no more A.extend(), so no more bug, but it does not fit my needs.
export default class B extends A {
}

I’ve setup a repo to reproduce the bug:

I’d love to understand what’s going on here and how I could migrate to 3.2 without refactoring A to use EmberObject.extend

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