[BUG]: Angular 9 doesn't work correctly with NGXS decorators with UMD

🐞 bug report

Affected Package

@angular/compiler

Is this a regression?

Yes

Description

https://stackblitz.com/edit/angular-9-ngxs?file=src/app/store/todo/todo.state.ts

@Persistence([
  {
      path: 'todos',
      existingEngine: localStorage
  }
])
@StateRepository()
@State<TodoStateModel>({
  name: 'todos',
  defaults: {
    todos: [],
    loaded: false,
    selectedTodo: null
  }
})
@Injectable()
export class TodoState
  extends NgxsDataRepository<TodoStateModel> {

  @Selector()
  public static todos(state: TodoStateModel) {
    return state.todos;
  }

  constructor(private readonly api: TodoApiService) {
    super()
  }

}

NGXS validates decorators through a handle. But now this does not work with Angular 9. However, if you build the application locally on the machine, everything works. Doesn’t work only on stackblitz, is that because it uses CommonJS?

🔬 Minimal Reproduction

https://stackblitz.com/edit/angular-9-ngxs?file=src/app/store/todo/todo.state.ts

🔥 Exception or Error

Error in /turbo_modules/@ngxs/store@3.6.2/__ivy_ngcc__/bundles/ngxs-store.umd.js (4626:23)
Selectors only work on methods

🌍 Your Environment

Angular Version:

Angular 9.1.7

[petebacondarwin]

It appears from talking to their team that this is actually a small bug in StackBlitz. apai4 is going to put a fix together! I am closing this here as it is not an issue with the Angular Framework.

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