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Info on unpublished packages should show in "missing" errors
Recently hoek 6.1.0 was unpublished from npm. My team had already upgraded and locked to that version. When it was unpublished, npm install would return the following error:
npm ERR! code E404 npm ERR! 404 Not Found: firstname.lastname@example.org
Better would be to have npm report something like this
npm ERR! <package>@<bad version> was unpublished from <repository url> on <date> with message <unpublish message>
That would create a great deal more clarity on what was actually happening.