feat: add ESLint with @antfu/eslint-config and CI workflow

.github/workflows/review.yml

@@ -6,6 +6,76 @@ env:
   TARGET_DRUPAL_CORE_VERSION: 11
 
 jobs:
+  changes:
+    runs-on: ubicloud-standard-4
+    permissions:
+      pull-requests: read
+    outputs:
+      js: ${{ steps.filter.outputs.js }}
+    steps:
+    - uses: actions/checkout@v6
+    - uses: dorny/paths-filter@v3
+      id: filter
+      with:
+        filters: |
+          js:
+            - '**/*.js'
+
+  eslint:
+    needs: changes
+    if: needs.changes.outputs.js == 'true'
+    runs-on: ubicloud-standard-4
+    timeout-minutes: 10
+    steps:
+    - uses: actions/checkout@v6
+
+    - uses: actions/setup-node@v4
+      with:
+        node-version: 22
+        cache: npm
+
+    - name: Install dependencies
+      run: npm ci
+
+    - name: Run ESLint
+      id: lint
+      run: |
+        set +e
+        npx eslint . 2>&1 | tee eslint-output.txt
+        echo "exit_code=${PIPESTATUS[0]}" >> "$GITHUB_OUTPUT"
+
+    - name: Generate summary
+      if: always()
+      uses: actions/github-script@v8
+      with:
+        script: |
+          const fs = require('fs');
+          const output = fs.readFileSync('eslint-output.txt', 'utf8');
+          const errorMatch = output.match(/(\d+)\s+error/);
+          const warningMatch = output.match(/(\d+)\s+warning/);
+          const errors = errorMatch ? errorMatch[1] : '0';
+          const warnings = warningMatch ? warningMatch[1] : '0';
+          const problems = Number(errors) + Number(warnings);
+          const summary = [
+            '## ESLint Results',
+            '',
+            '| Metric   | Count |',
+            '|----------|-------|',
+            `| Problems | ${problems} |`,
+            `| Errors   | ${errors} |`,
+            `| Warnings | ${warnings} |`,
+          ].join('\n');
+          core.summary.addRaw(summary).write();
+
+    - name: Fail if lint errors
+      if: always()
+      run: |
+        exit_code="${{ steps.lint.outputs.exit_code }}"
+        if [ "$exit_code" != "0" ]; then
+          echo "ESLint found errors."
+          exit 1
+        fi
+
   drupal-lint:
     runs-on: ubicloud-standard-4
     timeout-minutes: 60

.gitignore

@@ -62,3 +62,6 @@
 /drush
 /drupal.phar
 /drupal
+
+# Node.js
+node_modules/

eslint.config.js

@@ -0,0 +1,54 @@
+import antfu from '@antfu/eslint-config';
+
+export default antfu(
+  {
+    type: 'lib',
+    javascript: {
+      overrides: {
+        'no-console': ['error', { allow: ['warn', 'error'] }],
+      },
+    },
+    typescript: false,
+    vue: false,
+    react: false,
+    jsonc: false,
+    yaml: false,
+    toml: false,
+    markdown: false,
+    stylistic: {
+      semi: true,
+      quotes: 'single',
+    },
+  },
+  {
+    files: ['js/**/*.js'],
+    languageOptions: {
+      globals: {
+        Drupal: 'readonly',
+        drupalSettings: 'readonly',
+        once: 'readonly',
+        jQuery: 'readonly',
+        navigator: 'readonly',
+        window: 'readonly',
+        document: 'readonly',
+        setTimeout: 'readonly',
+        clearTimeout: 'readonly',
+        fetch: 'readonly',
+        Promise: 'readonly',
+        Array: 'readonly',
+        IntersectionObserver: 'readonly',
+        console: 'readonly',
+        JSON: 'readonly',
+        Object: 'readonly',
+      },
+    },
+    rules: {
+      'no-prototype-builtins': 'off',
+    },
+  },
+  {
+    ignores: [
+      'node_modules/**',
+    ],
+  },
+);