chore: add lint:unused script to run Knip (#724)

* chore: add lint:unused script to run Knip

* apply suggestion

* drop knip ignoreBinaries for `report`

* move test entry under mocha config

Author: Pixel998

.github/workflows/ci.yml

@@ -22,6 +22,8 @@ jobs:
               run: npm run build
             - name: Lint files
               run: npm run lint
+            - name: Lint Files, Dependencies, & Exports
+              run: npm run lint:unused
 
     format:
         name: File Format

knip.json

@@ -0,0 +1,15 @@
+{
+  "$schema": "https://unpkg.com/knip@5/schema.json",
+  "mocha": {
+    "entry": ["tests/**/*.{cjs,cts,js,ts}"]
+  },
+  "workspaces": {
+    "packages/eslint-visitor-keys": {
+      "entry": ["test-d/**/*.test-d.ts"]
+    },
+    "packages/espree": {
+      "entry": ["espree.cts", "test-d/**/*.test-d.ts", "tools/**/*.js"],
+      "ignore": ["tests/fixtures/**"]
+    }
+  }
+}

package.json

@@ -3,14 +3,15 @@
   "private": true,
   "type": "module",
   "scripts": {
-    "test": "npm test --workspaces --if-present",
     "build": "npm run build --workspaces --if-present",
     "build:types": "npm run build:types --workspaces --if-present",
     "lint": "eslint",
     "lint:fix": "eslint --fix",
     "lint:types": "npm run lint:types --workspaces --if-present",
+    "lint:unused": "knip",
     "fmt": "prettier --write .",
-    "fmt:check": "prettier --check ."
+    "fmt:check": "prettier --check .",
+    "test": "npm test --workspaces --if-present"
   },
   "workspaces": [
     "packages/*"
@@ -27,18 +28,20 @@
   },
   "devDependencies": {
     "@arethetypeswrong/cli": "^0.18.2",
+    "@types/node": "^20.19.0",
     "@typescript-eslint/parser": "^8.49.0",
     "c8": "^10.1.3",
     "eslint": "^9.35.0",
     "eslint-config-eslint": "^13.0.0",
     "eslint-plugin-chai-friendly": "^1.0.0",
     "eslint-plugin-expect-type": "^0.6.2",
     "globals": "^17.0.0",
+    "knip": "^5.82.1",
     "lint-staged": "^16.0.0",
     "mocha": "^11.1.0",
+    "prettier": "3.8.1",
     "rollup": "^4.55.2",
     "typescript": "^5.9.3",
-    "prettier": "3.8.1",
     "yorkie": "^2.0.0"
   }
 }