Dead Code

Dead code detection is powered by Knip. Unused code bloats your bundle, slows cold starts, and increases deployment size — all of which translate to higher Vercel costs.

You can disable dead code detection entirely with --no-dead-code or "deadCode": false in your config file.

knip/files

Detects files that are not imported by any other file in the project.

Why it matters: Unused files are still deployed and parsed during builds. They increase cold start time by adding to the module graph.

Fix: Delete the file, or if it's intentionally standalone, add it to your Knip config's entry patterns.

---

knip/exports

Detects exported symbols (functions, variables, classes) that are never imported anywhere.

Why it matters: Unused exports add dead code to your bundle. Tree-shaking doesn't always eliminate them, especially in server-side code.

Fix: Remove the export keyword, or delete the symbol if it's no longer needed.

---

knip/types

Detects exported TypeScript types and interfaces that are never referenced.

Fix: Remove unused type exports.

---

knip/duplicates

Detects the same symbol exported from multiple files.

Why it matters: Duplicate exports create ambiguity and can lead to importing from the wrong file, pulling in more code than necessary.

Fix: Consolidate duplicates into a single export location.