Fix yarn private dependencies

[sdyroff]

SUMMARY

This fixes multiple issues of the yarn module.

• The yarn.list() method did not work with private npm dependencies which start with @
• The check if a package.json is already in the defined path is not necessary, as yarn creates a package.json if necessary
• Do not fail the module if all errors retrieved from yarn are warnings

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

yarn

ADDITIONAL INFORMATION

We would like to use the yarn module to install private dependencies in an empty directory. This works only if the above issues are fixed.

[sdyroff]

@verkaufer
@chrishoffman

[sdyroff]

I rebased and updated my PR

[martin-probst]

+1

[duck-rh]

I confirm the problem with private dependencies is fixed. I also stumbled onto the package.json problem and the code for this part looks fine. I don't think I hit the problem with the warnings but the code looks fine too.

[ansibot]

Thank you very much for your interest in Ansible. Ansible has migrated much of the content into separate repositories to allow for more rapid, independent development. We are closing this issue/PR because this content has been moved to one or more collection repositories.

• lib/ansible/modules/packaging/language/yarn.py -> https://galaxy.ansible.com/community/general

For further information, please see:
https://github.com/ansible/ansibullbot/blob/master/docs/collection_migration.md