fix prepare script

package.json

@@ -7,7 +7,7 @@
   "scripts": {
     "pretest": "pnpm build",
     "test": "vitest",
-    "prepare": "pnpm build",
+    "prepare": "pnpm build:cjs",
     "build": "concurrently \"pnpm:build:*\" --names \"build:\" --prefixColors auto",
     "build:ts": "tsc",
     "build:cjs": "npx rollup index.js --file dist/index.cjs --format cjs --plugin @rollup/plugin-commonjs --plugin @rollup/plugin-node-resolve",