feat(manager/npm): extract currentValue from Yarn 'npm:' prefixed alias

[emilbader]

Changes

• Handles extraction of a valid npm: prefixed currentValue

Context

When installing packages with Yarn using its --cached option, Yarn will preferably reuse the highest version already used somewhere within the project. A side-effect is that the resolved package will look like "depName": "npm:1.x.x". This syntax is valid for Yarn but not for Renovate that claims: Invalid npm package alias: npm:1.x.x. All projects or workspaces installing dependencies with yarn add --cached will therefore not be be picked up by Renovate.

• Original issue for handling NPM package aliases

Documentation (please check one with an [x])

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• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[CLAassistant]

All committers have signed the CLA.

[emilbader]

@rarkins Thanks for the comments; is there anything else I should modify? If not, how does the merge process look like?

Stale

[renovate-release]

🎉 This PR is included in version 36.108.0 🎉

The release is available on:

• GitHub release
• 36.108.0

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