chore: add automated code quality checks

.eslintignore

@@ -9,3 +9,9 @@ cypress
 node_modules
 vendor
 google-fonts.js
+
+# Bundled third-party frontend libraries.
+src/js/frontend/idle-timer.js
+src/js/frontend/jquery.blockUI.js
+src/js/frontend/jquery.waypoints.js
+src/js/frontend/jsuri.js

.github/workflows/code-quality.yml

@@ -0,0 +1,63 @@
+name: Code Quality
+
+on:
+  pull_request:
+    branches: [main]
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+concurrency:
+  group: code-quality-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  eslint:
+    name: ESLint
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint:js
+
+  php-quality:
+    name: PHPCS + PHPStan
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+        with:
+          persist-credentials: false
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+          tools: composer:v2
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run PHPCS
+        run: composer phpcs
+
+      - name: Run PHPStan
+        run: composer phpstan -- --error-format=github

composer.json

@@ -3,19 +3,45 @@
     "description": "Post comments without a reload.",
     "type": "project",
     "license": "GPL",
+    "require": {
+        "php": ">=7.2"
+    },
+    "require-dev": {
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "phpcompatibility/phpcompatibility-wp": "^2.1",
+        "php-stubs/wordpress-stubs": "^6.5",
+        "phpstan/phpstan": "^2.0",
+        "squizlabs/php_codesniffer": "^3.7",
+        "szepeviktor/phpstan-wordpress": "^2.0",
+        "wp-coding-standards/wpcs": "^3.0"
+    },
     "authors": [
         {
             "name": "Ronald Huereca",
             "email": "ronald@dlxplugins.com"
         }
     ],
     "minimum-stability": "dev",
+    "prefer-stable": true,
     "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        },
+        "sort-packages": true,
         "vendor-dir": "lib"
     },
-      "autoload": {
+    "autoload": {
         "psr-4": {
             "DLXPlugins\\WPAC\\": "php/"
         }
+    },
+    "scripts": {
+        "phpcs": "phpcs",
+        "phpcbf": "phpcbf",
+        "phpstan": "phpstan analyse --memory-limit=1G",
+        "lint": [
+            "@phpcs",
+            "@phpstan"
+        ]
     }
 }