chore: enable no-unused vars (#2181)

.eslintrc.js

@@ -45,7 +45,14 @@ const config = {
     '@typescript-eslint/no-non-null-assertion': 'off',
     '@typescript-eslint/no-explicit-any': 'off',
     '@typescript-eslint/no-empty-function': 'off',
-    '@typescript-eslint/no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-vars': [
+      'error',
+      {
+        varsIgnorePattern: '^_',
+        argsIgnorePattern: '^_',
+        caughtErrorsIgnorePattern: '^_',
+      },
+    ],
     'unused-imports/no-unused-imports': 'error',
     'simple-import-sort/imports': 'error',
     'simple-import-sort/exports': 'error',