Co-authored-by: Rhys Arkins <rhys@arkins.net>

Co-authored-by: Rhys Arkins <rhys@arkins.net>

Closes #6360

Detects preferred node version for npm, yarn and pnpm docker calls.

Renovate will no longer embed npm, yarn and pnpm as dependencies. Therefore, if you are not running via the Docker full image, then you need to ensure that any of these managers are installed prior to running Renovate. This is inline with other managers such as Gradle or Poetry that require installation alongside Renovate too.

Closes #4208

BREAKING CHANGE: npm, yarn and pnpm are no longer embedded with the installation

* chore(deps): update dependency prettier to v2

* Run prettier-fix

Co-authored-by: Renovate Bot <bot@renovateapp.com>
Co-authored-by: Jamie Magee <jamie.magee@gmail.com>

Ref #5555

Co-authored-by: Rhys Arkins <rhys@arkins.net>

Use defined error constants throughout codebase.

When running the `lockFileMaintenance`, the lock file is removed before it gets recreated. When the lock file is not present, npm creates a `package-lock.json` by default, so we need to rename it to `npm-shrinkwrap.json` when we want to get an updated version.

Closes #3972

This fix allows update-lockfile updates to work with lerna/npm where there is a package-lock.json in every package. Still won’t work if there’s a mix of update-lockfile and non/update-lockfile updates within one branch though.