Add a rule for plain linting

bank/bank-frontend/package.json

@@ -7,6 +7,7 @@
     "build": "ng build",
     "watch": "ng build --watch --configuration development",
     "test": "ng test",
+    "lint": "eslint --ext .ts",
     "lint-fix": "eslint --ext .ts --fix ."
   },
   "private": true,