Reasons I voted for npm

1. Came first, breaking habits is hard
2. With cache, npm is fast as yarn. (here's how)
3. I just feel the folks working on npm are really nice

We recently switched to Yarn in both development and production. Yarn is faster, and yarn.lock is a life saver. We ran into so many issues with npm and shrinkwrap didn't work reliably for us.

NPM because I don't think I need YARN as of now

I tend to use as few and small dependencies as possible, so my npm installs are really quick. Haven't tried yarn, it still lacks features I need.

During development I use yarn, but in prod I use npm. In prod I have a dockerfile and I don´t want to bloat it with stuff that I don´t need, so I just use npm.