<T extends ManagedObject>(target: T, propertyKey: any): void
Managed object property decorator: amend decorated property to turn it into a managed child reference.
This asserts a parent-child dependency between the referrer and the referenced object(s), recursively extending to objects in referenced managed lists, maps, and reference instances:
When the parent is destroyed, all children are also destroyed.
When the decorated property is set to another object, the previously referenced object is destroyed.
When the referenced object is assigned to another managed child reference (or list, map, or reference instance that is a child object), the decorated property is set to undefined.
The child object may refer to its parent using the
ManagedObject.getManagedParentmethod, and observers can observe the managed parent reference using an