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Error TS1206: Decorators are not valid here on a non-top level class #8361

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@bcherny

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@bcherny
function decorator(container, key) {}

class A {
    @decorator // OK
    fn(){}
}

let a = {
    b: class B {
        @decorator // Error TS1206: Decorators are not valid here
        fn(){}
    }
}

My use case is a controller class in an Angular 1.5 component:

const MyComponent = {
  bindings: {...},
  template: `...`,
  controller: class MyComponentController extends BaseComponent {
    @override
    foo() {...}
  }
}

abstract class BaseComponent {
  protected foo() {...}
}

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