Функция onBecomeObserved

onBecomeObserved(
    value:
        | ObservableMap<any, any>
        | IObservable
        | IObservableArray<any>
        | IComputedValue<any>
        | ObservableSet<any>,
    listener: Lambda,
): Lambda

onBecomeObserved<K, V = any>(
    value: Object | ObservableMap<K, V>,
    property: K,
    listener: Lambda,
): Lambda