npm ci failures usually need a manifest and lockfile comparison before cache cleanup

An npm ci failure should usually start with a package.json and package-lock.json comparison before anyone clears caches or changes install flags. npm documents npm ci as a clean-install command for CI and similar environments. It requires an existing lockfile, removes node_modules before install, and exits with an error when package.json and the lockfile do not match.

That behavior is a signal, not just friction. It says CI is refusing to invent a new dependency tree. The fix may be to run the correct package manager locally and commit the updated lockfile. It may also be to revert a manifest change that was not meant to land. Clearing npm cache rarely answers which of those happened.

A good debugging note records the package manager version, Node version, install command, package.json diff, package-lock diff, whether the lockfile was committed, and whether the failing branch merged dependency changes from another branch. If install flags such as legacy peer dependency handling were used when the lockfile was created, note that too, because npm docs warn that matching flags may be needed.

The goal is not to memorize npm errors. The goal is to keep dependency resolution as a reviewable change. A lockfile update should be reviewed like code because it changes what CI installs.

npm ci failures usually need a manifest and lockfile comparison before cache cleanup

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