adjust "unicorn/no-useless-undefined" and "@typescript-eslint/no-unused-vars"

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Adjusted Javascript rule set according the Typescript rule set
 - tsconfigRootDir defaults to the tsconfig.json directory searched recusively starting from process.cwd()
+- Adjusted "unicorn/no-useless-undefined" to allow undefined arrow functions
+- Adjusted "@typescript-eslint/no-unused-vars" to allow unused variables starting with "\_" (TypeScript style: https://typescript-eslint.io/rules/no-unused-vars/#faqs)
 
 ## [2.1.0] - 2025-04-10
 

src/configs/providers/typescript.ts

@@ -79,7 +79,18 @@ const typescriptRules = config(
 
       // https://github.com/typescript-eslint/typescript-eslint/issues/2621
       "no-unused-vars": "off",
-      "@typescript-eslint/no-unused-vars": "error",
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          args: "all",
+          argsIgnorePattern: "^_",
+          caughtErrors: "all",
+          caughtErrorsIgnorePattern: "^_",
+          destructuredArrayIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          ignoreRestSiblings: true,
+        },
+      ],
     },
   },
 );

src/configs/providers/unicorn.ts

@@ -14,6 +14,10 @@ const unicornRules = config(
       "unicorn/prefer-query-selector": "off",
       "unicorn/switch-case-braces": "off",
       "unicorn/no-null": "off",
+      "unicorn/no-useless-undefined": [
+        "error",
+        { checkArrowFunctionBody: false },
+      ],
     },
   },
   {