Disable 'no-unused-vars' when they start with an underscore

Author: andyleejordan

.eslintrc.json

@@ -31,6 +31,12 @@
     ],
     "@typescript-eslint/no-non-null-assertion": [
       "off"
+    ],
+    "@typescript-eslint/no-unused-vars": [
+      "error",
+      {
+        "argsIgnorePattern": "^_"
+      }
     ]
   }
 }