fix(eslint): align language option defaults (#131)

Author: chenjiahan

template-eslint/react-js/eslint.config.mjs

@@ -14,16 +14,10 @@ export default defineConfig([
       reactRefresh.configs.recommended,
     ],
     languageOptions: {
-      ecmaVersion: 2020,
       globals: globals.browser,
       parserOptions: {
-        ecmaVersion: 'latest',
         ecmaFeatures: { jsx: true },
-        sourceType: 'module',
       },
     },
-    rules: {
-      'no-unused-vars': ['error', { varsIgnorePattern: '^[A-Z_]' }],
-    },
   },
 ]);

template-eslint/react-ts/eslint.config.mjs

@@ -16,7 +16,6 @@ export default defineConfig([
       reactRefresh.configs.recommended,
     ],
     languageOptions: {
-      ecmaVersion: 2020,
       globals: globals.browser,
     },
   },