ci: add eslint to the github action

Author: dyaskur

.eslintrc.js

@@ -0,0 +1,21 @@
+module.exports = {
+  'env': {
+    'browser': true,
+    'commonjs': true,
+    'es2021': true,
+  },
+  'extends': 'google',
+  'overrides': [],
+  'parserOptions': {
+    'ecmaVersion': 'latest',
+  },
+  'rules': {
+    'max-len': [
+      'error',
+      {'code': 120, 'ignoreTemplateLiterals': true, 'ignoreStrings': true}],
+    'valid-jsdoc': [
+      2, {
+        'prefer': {'return': 'returns'},
+      }],
+  },
+};

.gcloudignore

@@ -7,6 +7,7 @@
 #   $ gcloud topic gcloudignore
 #
 .gcloudignore
+.eslintrc.js
 # If you would like to upload your .git directory, .gitignore file or files
 # from your .gitignore file, remove the corresponding line
 # below:

.github/workflows/node.js.yml

@@ -28,3 +28,5 @@ jobs:
         cache: 'npm'
     - run: npm ci
     - run: npm test
+    - name: Run ESLint
+      run: eslint

package.json

@@ -13,6 +13,8 @@
     "googleapis": "110.0.0"
   },
   "devDependencies": {
+    "eslint": ">=5.16.0",
+    "eslint-config-google": "^0.14.0",
     "jest": "^29.4.2"
   }
 }