chore: migrate flat config

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [18.x, 20.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
@@ -28,6 +28,7 @@ jobs:
         cache: 'npm'
     - run: npm ci
     - run: npm run build --if-present
+    - run: npm run lint
     - run: npm test
     - name: Coveralls GitHub Action
       uses: coverallsapp/github-action@v2.2.3

eslint.config.js

@@ -0,0 +1,14 @@
+const js = require("@eslint/js");
+const globals = require("globals");
+
+module.exports = [
+  js.configs.recommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.commonjs,
+      },
+    },
+  },
+];

package.json

@@ -4,7 +4,8 @@
   "description": "Generator of Google Apps Script entry point function",
   "main": "index.js",
   "scripts": {
-    "test": "eslint index.js && nyc --reporter=lcovonly --reporter=text-summary tap test/*.test.js"
+    "lint": "eslint index.js",
+    "test": "nyc --reporter=lcovonly --reporter=text-summary tap test/*.test.js"
   },
   "repository": {
     "type": "git",
@@ -21,7 +22,9 @@
     "estraverse": "5.3.0"
   },
   "devDependencies": {
+    "@eslint/js": "^9.1.1",
     "eslint": "9.1.0",
+    "globals": "^15.0.0",
     "nyc": "15.1.0",
     "tap": "16.3.10"
   }