Create an eslint workflow

.github/workflows/eslint.yml

@@ -0,0 +1,48 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# ESLint is a tool for identifying and reporting on patterns
+# found in ECMAScript/JavaScript code.
+# More details at https://github.com/eslint/eslint
+# and https://eslint.org
+
+name: ESLint
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ "main" ]
+
+jobs:
+  eslint:
+    name: Run eslint scanning
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+      actions: read # only required for a private repository by github/codeql-action/upload-sarif to get the Action run status
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install ESLint
+        run: |
+          npm install eslint@9.12.0
+          npm install @microsoft/eslint-formatter-sarif@3.1.0
+
+      - name: Run ESLint
+        env:
+          SARIF_ESLINT_IGNORE_SUPPRESSED: "true"
+        run: npx eslint .
+          --format @microsoft/eslint-formatter-sarif
+          --output-file eslint-results.sarif
+        continue-on-error: true
+
+      - name: Upload analysis results to GitHub
+        uses: github/codeql-action/upload-sarif@v3
+        with:
+          sarif_file: eslint-results.sarif
+          wait-for-processing: true

eslint.config.js

@@ -0,0 +1,47 @@
+const globals = require('globals');
+const js = require('@eslint/js');
+
+module.exports = [
+    js.configs.recommended,
+    {
+        languageOptions: {
+            globals: {
+                ...globals.browser,
+                ...globals.jest,
+            },
+            parserOptions: {
+                'ecmaVersion': 'latest'
+            },
+        },
+        ignores: [
+            'build'
+        ],
+        'rules': {
+            'indent': [
+                'error',
+                4
+            ],
+            'linebreak-style': [
+                'error',
+                'windows'
+            ],
+            'quotes': [
+                'error',
+                'single'
+            ],
+            'semi': [
+                'error',
+                'always'
+            ],
+            'no-undef': 'off',
+            'no-unused-vars': 'off'
+        }
+    },
+    {
+        'files': ['packed.js'],
+        'rules': {
+            'no-unused-vars': 'error',
+            'no-undef': 'error'
+        }
+    }
+];

gulpfile.mjs

@@ -14,8 +14,8 @@
 ];
 
 const BUILD_PATH = 'build';
-const EXTENSION_FILENAME = 'whatsapp-web-plus'
+const EXTENSION_FILENAME = 'whatsapp-web-plus';
 
 export function clean() {
     return deleteAsync(BUILD_PATH);
 }