Last tested: Oct 7, 2020
Angular is not supported right now. In theory, any application framework can be used to build an extension, but we highly/strongly recommend React. Potentially, you could use a converter like this, but our engineers suggest it would not be an optimal development process. With React, we provide a build setup that is guaranteed to work. We cannot guarantee this with other JS frameworks right now.
Yes, you can use Angular for developing extension frameworks. For the angular app development track using mobile apps.