fix(eslint-config-turbo): use module.exports for ESLint v8 compatibility

Fixes #10901

In PR #10794, we changed from module.exports to export default, which
caused bunchee to generate exports.default = config instead of
module.exports = config in the CommonJS build.

ESLint v8 with legacy .eslintrc.* configuration expects shareable
configs to export directly via module.exports. When it encounters
exports.default, it interprets 'default' as an unexpected top-level
configuration property, resulting in the error:
'Unexpected top-level property "default"'

This fix reverts to module.exports for the main entry point to restore
ESLint v8 compatibility, while maintaining ESLint v9 flat config support
through the ./flat export path.

Testing:
- Verified publint --strict passes
- Verified attw type checking passes
- Confirmed compiled output uses module.exports
- Both CJS require() and ESM import() work correctly

Author: anthonyshew

packages/eslint-config-turbo/package.json

@@ -32,7 +32,6 @@
   ],
   "main": "./dist/cjs/index.js",
   "types": "./dist/cjs/index.d.ts",
-  "module": "./dist/es/index.mjs",
   "exports": {
     "./flat": {
       "import": {
@@ -46,8 +45,8 @@
     },
     ".": {
       "import": {
-        "types": "./dist/es/index.d.mts",
-        "default": "./dist/es/index.mjs"
+        "types": "./dist/cjs/index.d.ts",
+        "default": "./dist/cjs/index.js"
       },
       "require": {
         "types": "./dist/cjs/index.d.ts",

packages/eslint-config-turbo/src/index.ts

@@ -2,5 +2,4 @@ const config = {
   extends: ["plugin:turbo/recommended"],
 };
 
-// eslint-disable-next-line import/no-default-export -- ESLint convention is a default export
-export default config;
+module.exports = config;