Stark UI
Stark's UI package (aka stark-ui) provides the UI related features of the Stark framework. It includes the UI component kit of Stark as well as other services and utilities.
The Stark-UI module depends on some functionalities provided by the Stark-Core module such as services. However you can use this module without Stark-Core as long as you provide the same functionalities/services yourself.
Testing subpackage
Stark UI comes also with the subpackage @nationalbankbelgium/stark-ui/testing which contains the mock classes that come in hand
when implementing unit tests that depend on any of the main services provided by Stark UI.