fix: build issue

package.json

@@ -1,9 +1,10 @@
 {
   "name": "@ax-llm/ax",
-  "version": "9.0.12",
+  "version": "9.0.13",
   "type": "module",
   "description": "The best library to work with LLMs",
   "typings": "./build/module/src/index.d.ts",
+  "main": "./build/module/src/index.js",
   "module": "./build/module/src/index.js",
   "exports": "./build/module/src/index.js",
   "repository": {