lint: ignore unused vars with _ prefix

plice/.eslintrc.cjs

@@ -26,5 +26,18 @@ module.exports = {
         parser: '@typescript-eslint/parser'
       }
     }
-  ]
+  ],
+  rules: {
+    // note you must disable the base rule
+    // as it can report incorrect errors
+    'no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-vars': [
+      'error',
+      {
+        argsIgnorePattern: '^_',
+        varsIgnorePattern: '^_',
+        caughtErrorsIgnorePattern: '^_'
+      }
+    ]
+  }
 };