That seems to have gotten us past that error, but now:

Property 'get' does not exist on type 'ICollaborativeContentProvider'.

🤔

Hmm the implementation actually does have a get() method. This is due to the interface of ICollaborativeContentProvider not inheriting from IContentProvider. I think we may want to expose it if this is desirable.

Originally posted by @krassowski in geojupyter/jupytergis#848 (comment)