support yarn version 2

[vignanl]

Projects which use Yarn version 2 are facing caching issue with lage because there is a logical dependency of parsing yarn lock file in workspace-tools. current workspace-tools can only parse lock files of yarn version 1, it breaks for yarn version 2 lock files.

#microsoft/lage#129

[axelhzf]

It looks like parsing yarn2 is possible with the @yarnpkg/core package

https://github.com/snyk/nodejs-lockfile-parser/pull/75/files#diff-b2c66eb5bb9dd1c3dc4998a5d18767af92cc71cd287f5b115a8a602dfc7a275aR27

And here is how to test the lockfile version

https://github.com/snyk/nodejs-lockfile-parser/pull/75/files#diff-d5a4b3a0309f2337144861084c1014523cced561eb722cb9684c63f5e41e0567R120

If using an external library is an option, https://github.com/snyk/nodejs-lockfile-parser can parse lockfiles in several formats including yarn2.

[shaulgo]

Are there any plans to fix this?

[kenotron]

The external lockfiles parser would be okay if it's relatively clean and simple (and well maintained)!

[kenotron]

Sooooo, first off, I have a great coworker who is also interested in this. He is going to contribute a disabled, failing test that tests against yarn 2 / 3 here first. I'll then have the opportunity to fix it by either consuming a new package (like nodejs-lockfile-parser) or consuming the @yarnpkg/core from v2+ directly. Some implementation notes:

We'll need a failing test here:

https://github.com/microsoft/workspace-tools/tree/master/src/__tests__

And likely a yarn 2/3 fixture added to:

https://github.com/microsoft/workspace-tools/tree/master/src/__fixtures__