Timeout for CancellationToken unsupported methods

TaskExtensions.cs

public static class TaskExtensions
{
    public static async Task<T> WithTimeout<T>(this Task<T> task, int timeout)
    {
        using var cts = new CancellationTokenSource();
        var completedTask = await Task.WhenAny(task, Task.Delay(timeout, cts.Token)).ConfigureAwait(false);
        cts.Cancel();
        return completedTask == task ? task.Result : default;
    }
}