feat: add resolveLockfile

[danielroe]

for implementing nuxt/nuxt#11074 and unjs/nitro#149.

Q: We could also have a utility for detecting a version controlled root? Some monorepos don't have a lockfile in their root, e.g. just a client and server directory, or similar - but I think allowing users to configure likely covers that case.

[pi0]

I like the idea of having this building block to write workspace resolution logic but let's give it precise name as it does.

[danielroe]

But, more precisely, it resolves a package.json that is either alongside a lockfile or contains a workspaces key. I don't think it would be that useful to resolve the lockfile itself, and in some cases the root package.json might not be accompanied by a lockfile.

[pi0]

Yeah it is complexer than this to find actual workspace root. I kinda liked the idea to have small utility and combine some heuristics after you renamed from findWorkspaceDir to try best to find workspace root.

currently if we have a lockfile in subdir, like docs/yarn.lock and docs/package.json, it considers nested lock as rootfile.

[pi0]

Better way to say: We can probably guess root better if do several find attempts or extract information once and check it more than once (instead of finding nearest pkg+lock combo). Something like .git is more reliable than even (closest)lockfile

[codecov]

Codecov Report

Merging #14 (eb32854) into main (9189bca) will decrease coverage by 96.33%.
The diff coverage is n/a.

❗ Current head eb32854 differs from pull request most recent head 577c91f. Consider uploading reports for the commit 577c91f to get more accurate results

@@           Coverage Diff            @@
##             main   nuxt/nuxt.js#10939       +/-   ##
========================================
- Coverage   96.33%     0   -96.34%     
========================================
  Files           5     0        -5     
  Lines         109     0      -109     
  Branches       26     0       -26     
========================================
- Hits          105     0      -105     
+ Misses          4     0        -4     

Impacted Files	Coverage Δ
src/index.ts
src/utils.ts
src/types/packagejson.ts
src/types/index.ts
src/types/tsconfig.ts

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