diff --git a/package.json b/package.json
index 5cf9bf442..c4e62c270 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "build": "astro check && astro build",
     "preview": "astro preview",
     "astro": "astro",
-    "postinstall": "bun run setup.ts",
+    "postinstall": "bun run setup.mjs",
     "lunaria:build": "lunaria build",
     "lunaria:preview": "lunaria preview"
   },
diff --git a/setup.ts b/setup.mjs
similarity index 88%
rename from setup.ts
rename to setup.mjs
index ff63e2312..7f8e01e4f 100644
--- a/setup.ts
+++ b/setup.mjs
@@ -3,15 +3,7 @@ import { GITHUB_URL } from "~/utils/consts.ts";
 import { existsSync } from "node:fs";
 import { copyFile } from "node:fs/promises";
 
-interface GitItem {
-  name: string;
-  repo: string;
-  branch?: string;
-  install?: boolean;
-  folder?: string;
-}
-
-const gits: GitItem[] = [
+const gits = [
   {
     name: "sern-handler-v3",
     repo: "handler",