Email usernames in npm
Allowing "at" characters in npm usernames
Some npm registries use email addresses for usernames. That is incompatible with the npm commandline tools, like npm-login and npm-adduser. I found out how to configure the .npmrc file manually to avoid the problem.
Signing in to Azure Artifacts using npm on Mac
Microsoft Azure Artifacts uses your email address for logging in. If you are on Linux or a Mac, that can make it difficult to sign in to its npm registry using npm-login or npm-adduser. Here I show you how to configure your .npmrc file manually to avoid the problem.