internal static int GetValidIndexOrThrow()

in EnvDTE.Client/Util/ImplementationUtil.cs [12:18]

• 6 lines of code
• 3 McCabe index (conditional complexity)

    internal static int GetValidIndexOrThrow(object index, int? count = null)
    {
        if (index is not int number) throw new ArgumentException();
        // Indexes are 1-based in EnvDTE
        if (number < 1 || number > count) throw new ArgumentOutOfRangeException();
        return number - 1;
    }