Add build to prepublish

Author: pdziewa

package.json

@@ -16,7 +16,7 @@
     "test": "jest",
     "test:watch": "jest --watchAll --verbose",
     "typecheck": "tsc --noEmit",
-    "prepublishOnly": "npm run lint && npm run test"
+    "prepublishOnly": "npm run lint && npm run test && npm run build"
   },
   "devDependencies": {
     "@babel/preset-env": "^7.28.0",