A ProGet npm feed is a repository compatible with the npm client for NodeJS. ProGet npm feeds support both scoped and unscoped npm packages.
Connectors to the public repository at npmjs.org will not include scoped packages in search results, because the public repository does not have a mechanism for including them. Scoped packages can still be used through this connector; they are only excluded from searches, and this is the same behavior seen from searching at npmjs.org directly.
The npm client does not support using Windows Integrated Authentication, so ProGet attempts to disable its usage for npm API endpoints in favor of basic HTTP authentication. However, disabling Windows Authentication on a per-URL basis does not work in every environment. If you are having trouble getting this working, you may create a second web site in IIS for ProGet with Windows Authentication disabled without acquiring a separate license.