diff --git a/eslint.config.js b/eslint.config.js
index c8f6d53d4..b8073b6d6 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,5 +1,35 @@
-export default [
+import { defineConfig, globalIgnores } from 'eslint/config';
+import js from '@eslint/js';
+import globals from 'globals';
+
+export default defineConfig([
+  globalIgnores(['assets/*', 'node_modules/*', '_site/*']),
+  js.configs.recommended,
   {
-    files: ['_javascript/**/*.js']
+    rules: {
+      semi: ['error', 'always'],
+      quotes: ['error', 'single']
+    },
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+        ...globals.node
+      }
+    }
+  },
+  {
+    files: ['_javascript/**/*.js'],
+    languageOptions: {
+      globals: {
+        ClipboardJS: 'readonly',
+        GLightbox: 'readonly',
+        Theme: 'readonly',
+        dayjs: 'readonly',
+        mermaid: 'readonly',
+        tocbot: 'readonly',
+        importScripts: 'readonly',
+        swconf: 'readonly'
+      }
+    }
   }
-];
+]);
diff --git a/package.json b/package.json
index ceed0287e..bb712a6b4 100644
--- a/package.json
+++ b/package.json
@@ -13,14 +13,16 @@
     "url": "https://github.com/cotes2020/jekyll-theme-chirpy/issues"
   },
   "homepage": "https://github.com/cotes2020/jekyll-theme-chirpy/",
+  "type": "module",
   "scripts": {
     "build": "concurrently npm:build:*",
     "build:css": "node purgecss.js",
     "build:js": "rollup -c --bundleConfigAsCjs --environment BUILD:production",
     "watch:js": "rollup -c --bundleConfigAsCjs -w",
+    "lint:js": "eslint",
     "lint:scss": "stylelint _sass/**/*.scss",
     "lint:fix:scss": "npm run lint:scss -- --fix",
-    "test": "npm run lint:scss",
+    "test": "npm run lint:js && npm run lint:scss",
     "prepare": "husky"
   },
   "dependencies": {
@@ -42,6 +44,8 @@
     "@semantic-release/git": "^10.0.1",
     "concurrently": "^9.1.2",
     "conventional-changelog-conventionalcommits": "^8.0.0",
+    "eslint": "^9.27.0",
+    "globals": "^16.1.0",
     "husky": "^9.1.7",
     "purgecss": "^7.0.2",
     "rollup": "^4.41.0",
diff --git a/purgecss.js b/purgecss.js
index ad42db297..2380f6f77 100644
--- a/purgecss.js
+++ b/purgecss.js
@@ -1,5 +1,6 @@
-const fs = require('fs').promises;
-const { PurgeCSS } = require('purgecss');
+import { promises as fs } from 'fs';
+import { PurgeCSS } from 'purgecss';
+
 const DIST_PATH = '_sass/vendors';
 const output = `${DIST_PATH}/_bootstrap.scss`;