Neither Yarn 1 nor pnpm have seamless interop with npm, but pnpm is more clear about this and you get the benefit of it's linked install strategy (which npm is adding, btw).
People really should get off of Yarn 1. It's not maintained, has a poor package locking system, and bugs will simply never be fixed.
I feel a bit scammed by yarn because I started using yarn when it came out and developed a muscle memory and appreciation for its CLI, and they just completely left the Yarn 1 users hanging while they have been messing around with the Yarn 2+ experiment. I don’t want to install Yarn 2 because it’s a weird hack, I just want them to go back to focusing on Yarn 1 goddammit.
People really should get off of Yarn 1. It's not maintained, has a poor package locking system, and bugs will simply never be fixed.