Godot tween awaiter implementation in CSharp

TweenAwaitExtensions.cs

using System.Runtime.CompilerServices;
using Godot;

namespace Imk.GodotWrapper;

public static class TweenExtensions
{
    public static TweenAwaiter GetAwaiter(this Tween tween) => new TweenAwaiter(tween);
}

public struct TweenAwaiter : INotifyCompletion
{
    private Tween? _tween;

    public TweenAwaiter(Tween? tween)
    {
        _tween = tween;
    }

    public void OnCompleted(Action continuation)
    {
        if (_tween != null)
        {
            _tween.Finished += () =>
            {
                continuation?.Invoke();
            };
        }
        else
        {
            continuation?.Invoke();
        }
    }

    public bool IsCompleted
    {
        get
        {
            var isCompleted = _tween == null || !_tween.IsRunning();
            return isCompleted;
        }
    }

    public void GetResult()
    {
    }
}