Bug: "Used by" feature does not forget npm packge no longer in repository

The “Used by” feature seems to not forget the existence of an npm package once it doesn’t exist in the repository anymore.

  1. Create a repository that has a public npm package.
  2. Wait for “used by” to show up.
  3. Remove all the code for the npm package.

You can see an example of the end state here: https://github.com/dprint/dprint