workflow: update eslint rule

Author: ulivz

.eslintrc.js

@@ -5,6 +5,7 @@ module.exports = {
     'plugin:jest/recommended'
   ],
   rules: {
-    indent: ['error', 2, { MemberExpression: 'off' }]
+    indent: ['error', 2, { MemberExpression: 'off' }],
+    "no-undef": ["error"]
   }
 }