fix(yarn) pnp workspace support

[mufasa71]

Yarn berry works great with single mode, but does not works if inside workspace directory. I found that this line does not respect root monorepo:

volta/crates/volta-core/src/project/mod.rs

Line 176 in 7827ade

pub fn is_yarn_pnp(&self) -> bool {

as it expect .pnp.js on same level as root dir. But workspace dir does not have .pnp.js hence it works fine with yarn berry. like yarn why packagename

[charlespierce]

Thanks for taking this on! A suggestion to avoid duplicating work. Also, there may be some merge conflicts with #1388 which is adding another file to the checks here, so if that is merged first, it will need to be resolved.

[charlespierce]

I think this winds up duplicating work: self.workspace_roots() includes as the first entry the parent of self.manifest_file, so we're re-checking that. Instead, I think this check that you have is already exactly what we want (and can replace the whole self.manifest_file... check)

self
    .workspace_roots()
    .any(|dir| dir.join(".pnp.cjs").exists() || dir.join(".pnp.js").exists())

[mufasa71]

Thanks I applied changes, will wait until #1388 is merged to resolve conflicts.

[mufasa71]

Looks like #1388 is merged, can we merge this now?