private static void AddBaseType(CodeFixContext context, ClassDeclarationSyntax classDeclaration, TypeSyntax viewModelBaseType, DocumentEditor editor)
 {
     if (classDeclaration.BaseList != null &&
         classDeclaration.BaseList.Types.TryFirst(
             x => (x.Type as IdentifierNameSyntax)?.Identifier.ValueText.Contains("INotifyPropertyChanged") == true,
             out var baseType) &&
         context.Diagnostics.Any(IsINotifyPropertyChangedMissing))
     {
         editor.ReplaceNode(baseType, SyntaxFactory.SimpleBaseType(viewModelBaseType));
     }
     else
     {
         editor.AddBaseType(classDeclaration, viewModelBaseType);
     }
 }