Oh man, that would be a hell of an easter egg if it cleared your terminal and pretended to be a dos prompt
It's an alias to start the upgrade to Windows 11... you thought you were being careful all those months dodging the Windows 11 upgrade button but you've done it now! Get ready for an objectively worse OS!
Considering "being ruined" is a state, and not a scale, the dev is already ruined, because it's not Linux.
Source: Homestar Runner - Strong Bad Email #50 - 50 Emails
https://homestarrunner.com/sbemails/50-50-emails
https://www.youtube.com/watch?v=7rrZ-sA4FQc
NPM ruin dev
is a new advanced feature that endorses opinionated "extreme programming" techniques. First it gets to work rebuilding node_modules, but with all the least compatible module versions in order to accelerate testing. It also minifies your .js code in place, to save you some CPU cycles later. Lastly, it squashes your entire git history on all branches, to save space.
Hope you didn't have the repository URL in your package.json... otherwise it'll be gone now.