A piece of R3 extensions for Netcode for GameObjects

UnityNetcodeForGameObjectsObservableTriggerExtensions.cs

using Unity.Netcode;

namespace R3.Trigger
{
    public static class UnityNetcodeR3Extensions
    {
        public static Observable<(T previousValue, T newValue)> AsObservable<T>(this NetworkVariable<T> networkVariable)
        {
            return Observable.FromEvent<NetworkVariable<T>.OnValueChangedDelegate, (T, T)>(
                h => (previousValue, newValue) => h((previousValue, newValue)),
                h => networkVariable.OnValueChanged += h,
                h => networkVariable.OnValueChanged -= h);
        }
    }
}