fix(ci): add tsup config for vercel

package.json

@@ -13,7 +13,7 @@
     "generate": "stepci generate ./specs/openapi.yaml ./specs/generated.yaml",
     "start": "tsx app.ts",
     "start:prod": "node dist/app.js",
-    "vercel-build": "tsup app.ts --clean --format cjs,esm --env.NODE_ENV production --env.DEPLOYMENT_ENV vercel --out-dir build"
+    "vercel-build": "tsup --config tsup-vercel.config.ts"
   },
   "dependencies": {
     "@fastify/cors": "8.4.0",

tsup-vercel.config.ts

@@ -0,0 +1,14 @@
+import { type Options } from "tsup";
+
+const config: Options = {
+  entry: ["app.ts", "vercel/index.ts"],
+  clean: true,
+  format: ["cjs", "esm"],
+  env: {
+    NODE_ENV: "production",
+    DEPLOYMENT_ENV: "vercel",
+  },
+  outDir: "build",
+};
+
+export default config;

vercel.json

@@ -3,7 +3,7 @@
   "rewrites": [
     {
       "source": "/(.*)",
-      "destination": "/vercel/index.ts"
+      "destination": "/vercel/index.js"
     }
   ]
 }