Method propertyObserver

src/binding-engine.js:30–40

(obj, propertyName)

  }

  propertyObserver(obj, propertyName) {
    return {
      subscribe: callback => {
        let observer = this.observerLocator.getObserver(obj, propertyName);
        observer.subscribe(callback);
        return {
          dispose: () => observer.unsubscribe(callback)
        };
      }
    };
  }

  collectionObserver(collection) {
    return {