Drawing class diagram for ionic app

How can I draw class diagram for ionic application. There is no resources available in this regard. Few people at stackoverflow told me it is impossible to draw class diagram to ionic app. Is it true?

What does “class diagram” mean?
If you create classes yourself, just draw a diagram of how they are connected.
If you want a class diagram of Ionic Framework, you iwll have to look into tools that do it automatically for Angular apps (which Ionic is one) or do it by hand also. All the code is on Github.