chore: ✂️ implement Knip (#484)

Author: bartveneman

.github/workflows/test.yml

@@ -60,3 +60,14 @@ jobs:
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
       - run: npm run lint-package
+
+  knip:
+    name: Lint unused code
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
+        with:
+          node-version: 22
+      - run: npm ci --ignore-scripts --no-audit --no-fund
+      - run: npm run knip

knip.config.ts

@@ -0,0 +1,9 @@
+import type { KnipConfig } from 'knip'
+
+const config: KnipConfig = {
+	entry: ['src/index.ts'],
+	project: ['src/**/*.ts'],
+	ignoreDependencies: ['prettier'],
+}
+
+export default config