I'm confused by this, why do you think npm is needed? It just acts a central repo, you're free to self host the JS file yourself or pump it through a CDN. Jest

I'm confused by this, why do you think npm is needed? It just acts a central repo, you're free to self host the JS file yourself or pump it through a CDN. Jest is a different story, it's not a single JS file and has many dependencies. Running it globally is an easy way to reduce the need to include it per project.