Internal: Switch from yarn to pnpm

[IanVS]

It's faster, less buggy than yarn 1.x, and easier to work with than yarn 3/4.

One note: I did not try to migrate the lockfile, so this also updates all dependencies based on semver range in our package.json

[fbartho]

pnpm wasn’t safe to use with react-native when I last checked (>3 years ago). Is that fixed now?

Forgive a perhaps silly question, but if we do this, it implies a switch from yarn.lock to pnpm-lock.yaml — do package consumers end up seeing that file or no? My brain isn’t fully booted on this one.

[IanVS]

I'm not sure about pnpm and react-native, but since this isn't a react-native project, I think it's fine. The change will have no impact on consumers of the project, since whatever package manager they are using will be used to install it. So to answer your other question, no, the lock file is not exposed to end-users of a library / package. It's only used by contributors of the project when installing our dependencies and working on the project.