Unity3D: DOTween: Tween As Task

TweenExtensions.cs

public static class TweenExtensions
{
    public static Task AsTask(this Tween tween, CancellationToken cancellationToken)
    {
        var taskCompletionSource = new TaskCompletionSource<bool>();

        tween.OnComplete(() => { taskCompletionSource.TrySetResult(true); });
        tween.OnKill(() => { taskCompletionSource.TrySetCanceled(); });

        if (cancellationToken != CancellationToken.None)
        {
            tween.OnUpdate(() =>
            {
                if (cancellationToken.IsCancellationRequested)
                {
                    tween.Kill();
                }
            });
        }
           
        return taskCompletionSource.Task;
    }
}