It would be useful if TfxInstaller provided a registry option to select which NPM registry to install from. At the moment TfxInstaller is unusable in some configurations where (for example) npmjs.org is blocked.

(Auth should also automatically happen for this registry if it's an artifact feed in the same ADO project, just like in the Npm@x task.)

(See comments over here for more background: microsoft/tfs-cli#476 (comment).)