Doesn't work in parent class of inherited @customElement

[sousekd]

Works great, but I have found that the when it is used on a method in a base class of inherited custom element, it doesn't work. I have specifically used it to observe @deepComputed property, but the issue may affect other scenarios, too:

@customElement('child-element')
export class Child extends Parent<XYZ> {
  @bindable childProperty;
}

export abstract class Parent<TModel> {
   @bindable parentProperty : TModel;

   @deepComputedFrom('parentProperty')
   get computedParent() {
      return JSON.stringify(this.parentProperty);
   }
   
   @watch('computedParent') // either of these doesn't work here
   @watch(x: Parent => x.computedParent) 
   computedParentChanged() {
      // this will never get executed
   }
}

When the method with @watch decorator is moved over to Child class, it works.

[bigopon]

Thanks for the issue. This should be simple to fix.