chore: extend lint-staged to *.{mjs,yml,yaml}; add mjs sourceType override in ESLint

Author: euxx

eslint.config.mjs

@@ -37,10 +37,7 @@ export default [
       'no-return-assign': ['error', 'except-parens'],
       'no-self-compare': 'error',
       'no-throw-literal': 'error',
-      'no-unused-expressions': [
-        'error',
-        { allowShortCircuit: true, allowTernary: true, allowTaggedTemplates: true },
-      ],
+      'no-unused-expressions': ['error', { allowShortCircuit: true, allowTernary: true, allowTaggedTemplates: true }],
       'no-useless-return': 'error',
 
       // Modern JavaScript
@@ -51,6 +48,13 @@ export default [
       'no-duplicate-imports': 'error',
     },
   },
+  {
+    // Config files use ES module syntax
+    files: ['*.mjs'],
+    languageOptions: {
+      sourceType: 'module',
+    },
+  },
   {
     // Test files configuration
     files: ['tests/**/*.js', '**/*.test.js'],

package.json

@@ -98,12 +98,15 @@
     "vitest": "^3.2.4"
   },
   "lint-staged": {
-    "*.js": [
+    "*.{js,mjs}": [
       "eslint --fix",
       "prettier --write"
     ],
     "*.md": [
       "prettier --write --prose-wrap preserve"
+    ],
+    "*.{yml,yaml}": [
+      "prettier --write"
     ]
   }
 }