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The function of 'npm i --package-lock-only' is to update the package-lock.json file without installing any new packages or updating existing ones. It ensures that the dependencies in the package-lock.json file are up-to-date and consistent with the dependencies specified in the package.json file. It is useful in scenarios where you need to ensure that the package-lock.json file is in sync with the package.json file without making any changes to the actual dependencies.