/**
 * @description `Computed` is a property decorator.
 * Changes in computed state values are also recognized according to changes in observers used within the getter function.
 * You can detect its status through `.subscribe`.
 * @hidden
 * @category Reactive-Decorator
 * @see ReactiveSubscribe
 * @example
 * ```ts
const ob1 = observe(0);
const ob2 = observe(1);

// When
@ReactiveSubscribe
class TestComputed {
  @Computed
  get ob3() {
    return ob1.current + ob2.current;
  }
}
const inst = new TestComputed();

inst.subscribe("ob3", ob3 => {
  console.log(ob3);
});

ob1.current = 1;
```
 */
export declare function Computed(prototype: any, memberName: string, attributes: PropertyDescriptor): PropertyDescriptor;