Iβm struggle to understand how wp-source works, so I re-read the docs, and tried out the example there.
I find a typo: in the example code of the How to use section, the if (data.isCategory) { has no closing bracket }.
Also, the code does not work as it is, if the actions.source.fetch("/category/nature/"); is not within React.useEffect. It would be nice to either change the code, or explain the need of useEffect.
Thanks for your comments. We will certainly take them into account while we update the documentation. Adding a good variety examples is one of our priorities.