feat: add types to ESLint Scope

.github/workflows/ci.yml

@@ -45,3 +45,16 @@ jobs:
       run: npm run build
     - name: Run tests
       run: npm run test
+  are-the-types-wrong:
+    name: Are the types wrong?
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - name: Setup Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: 'lts/*'
+      - name: Install dependencies
+        run: npm install
+      - name: Are the types wrong?
+        run: npm run lint:types

eslint.config.js

@@ -2,7 +2,9 @@ import { defineConfig, globalIgnores } from "eslint/config";
 import eslintConfigESLint from "eslint-config-eslint";
 import eslintConfigESLintFormatting from "eslint-config-eslint/formatting";
 import eslintPluginChaiFriendly from "eslint-plugin-chai-friendly";
+import * as expectType from "eslint-plugin-expect-type";
 import globals from "globals";
+import tsParser from "@typescript-eslint/parser";
 
 export default defineConfig([
     globalIgnores([
@@ -11,8 +13,10 @@ export default defineConfig([
         "**/coverage/",
         "packages/espree/tools/create-test-example.js"
     ]),
-    eslintConfigESLint,
-    eslintConfigESLintFormatting,
+    {
+        files: ["**/*.{,c}js"],
+        extends: [eslintConfigESLint, eslintConfigESLintFormatting]
+    },
     {
         files: ["packages/*/tests/lib/**"],
         languageOptions: {
@@ -22,7 +26,7 @@ export default defineConfig([
         }
     },
     {
-        files: ["packages/eslint-scope/tests/**"],
+        files: ["packages/eslint-scope/tests/**/*.{,c}js"],
         languageOptions: {
             globals: {
                 ...globals.mocha
@@ -68,6 +72,21 @@ export default defineConfig([
             }
         }
     },
+    {
+        files: ["packages/eslint-scope/tests/types/*.{,c}ts"],
+        languageOptions: {
+            parser: tsParser,
+            parserOptions: {
+                project: ["packages/eslint-scope/tests/types/tsconfig.json"]
+            }
+        },
+        plugins: {
+            "expect-type": expectType
+        },
+        rules: {
+            "expect-type/expect": "error"
+        }
+    },
     {
         files: ["**/tools/**"],
         rules: {

package.json

@@ -7,7 +7,8 @@
     "test": "npm test --workspaces --if-present",
     "build": "npm run build --workspaces --if-present",
     "lint": "eslint",
-    "lint:fix": "eslint --fix"
+    "lint:fix": "eslint --fix",
+    "lint:types": "npm run lint:types --workspaces --if-present"
   },
   "workspaces": [
     "packages/*"
@@ -16,15 +17,17 @@
     "pre-commit": "lint-staged"
   },
   "lint-staged": {
-    "*.{js,cjs}": [
+    "*.{js,cjs,ts,cts}": [
       "eslint --fix"
     ]
   },
   "devDependencies": {
+    "@typescript-eslint/parser": "^8.47.0",
     "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": "^16.0.0",
     "lint-staged": "^15.2.0",
     "mocha": "^11.1.0",