Fix ESLint Wrning

Author: fzaninotto

.eslintrc

@@ -26,6 +26,15 @@
         ],
         "no-redeclare": "off",
         "import/no-anonymous-default-export": "off",
-        "@typescript-eslint/no-redeclare": ["error"]
+        "@typescript-eslint/no-redeclare": ["error"],
+        "no-unused-vars": "off",
+        "@typescript-eslint/no-unused-vars": [
+            "warn", // or "error"
+            { 
+                "argsIgnorePattern": "^_",
+                "varsIgnorePattern": "^_",
+                "caughtErrorsIgnorePattern": "^_"
+            }
+        ]
     }
 }