Resolve npm peer dependency conflicts with strict-peer-deps and legacy-peer-deps

domain: docs.npmjs.com · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗

Documented steps

  1. By default npm resolves peer-dependency conflicts deep in the graph by using the nearest non-peer version and prints a warning.
  2. To make any conflicting peerDependencies a hard failure (good for catching incompatibilities in CI), run `npm ci` or `npm install` with `--strict-peer-deps`.
  3. To instead make npm ignore/loosen peer conflict failures and install a best-effort tree (older behavior), use `--legacy-peer-deps`.
  4. For reproducible CI, commit the chosen flag: `npm config set legacy-peer-deps=true --location=project` (or strict-peer-deps=true) writes a repo .npmrc, so npm ci in CI uses it automatically — a requirement since npm ci fails when flags differ from the lockfile's creation flags.
  5. Check the audit/peer warnings to decide whether to bump the offending dependency rather than forcing install.

Known gotchas

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