Add type to requires and used by

[FWeinb]

This looks confusing. We should add the type of the required/used item.

[KittyGiraudel]

If we add it to require, we should add it to usedBy and see as well.

[FWeinb]

👍

[KittyGiraudel]

I'll give it a try.

[KittyGiraudel]

See #18 for review.