AI / RenovateBot Interview Questions

How does Renovate handle npm lockfiles and what is lockFileMaintenance?

Renovate distinguishes between the manifest (package.json) and the lockfile. lockFileMaintenance periodically regenerates the entire lockfile to update transitive dependencies.

{
  "lockFileMaintenance": {
    "enabled": true,
    "schedule": ["before 5am on monday"]
  },
  "packageRules": [
    {
      "matchManagers": ["npm"],
      "rangeStrategy": "pin"
    }
  ]
}

Lockfile update scenarios
Scenario	package.json changed?	Lockfile changed?
rangeStrategy: pin (patch update)	Yes — 1.2.x → 1.3.0	Yes
rangeStrategy: update-lockfile	No — range unchanged	Yes
Lock file maintenance run	No	Yes — full regeneration
New major dep (out of range)	Yes — range updated	Yes

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What does Renovate's lockFileMaintenance feature do?Validates that the lockfile matches package.json on every run

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Periodically regenerates the entire lockfile — updating all transitive dependencies to their latest allowed versions even when no direct dependency versions changed

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Prevents other tools from modifying the lockfile

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Removes unused packages from the lockfile

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Why does lockfile maintenance matter for transitive dependencies?Transitive deps are always updated with direct dep PRs

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Transitive dependencies are pinned only in the lockfile. Without periodic maintenance, they drift as the lockfile grows stale even when your direct dependencies are up-to-date

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Transitive deps are ignored by all package managers

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Lockfile maintenance is only relevant for yarn, not npm

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AI / RenovateBot Interview Questions

How does Renovate handle npm lockfiles and what is lockFileMaintenance?

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