diff --git a/.gitignore b/.gitignore
index 400bedc..147c019 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules
 .env
 .vercel
+.DS_Store
\ No newline at end of file
diff --git a/crawler/utils.ts b/crawler/utils.ts
index 51205a3..43cb378 100644
--- a/crawler/utils.ts
+++ b/crawler/utils.ts
@@ -1,7 +1,7 @@
 export const range = (start: number, end: number): number[] =>
   start === end ? [start] : [start, ...range(start + 1, end)]
 
-export const sleep = async ({ delay = 2000, throwReject = false }) => new Promise((resolve, reject) => {
+export const sleep = async ({ delay = 2000, throwReject = false }) => new Promise<void>((resolve, reject) => {
   setTimeout(() => {
     if (throwReject) reject({ timeout: true })
     else resolve()
diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
new file mode 100644
index 0000000..13e38a5
--- /dev/null
+++ b/pnpm-workspace.yaml
@@ -0,0 +1,2 @@
+allowBuilds:
+  puppeteer: true
diff --git a/server.ts b/server.ts
index 02496ab..b2ccb66 100644
--- a/server.ts
+++ b/server.ts
@@ -28,6 +28,16 @@ class Server {
       console.log(`Server listening on http://localhost:${this.port}`)
     })
   }
+
+  public getApplication(): Application {
+    return this.application
+  }
+}
+
+const server = new Server()
+
+if (require.main === module) {
+  server.run()
 }
 
-export default new Server().run()
+export default server.getApplication()
diff --git a/vercel.json b/vercel.json
index f8894be..57372d8 100644
--- a/vercel.json
+++ b/vercel.json
@@ -3,9 +3,9 @@
   "builds": [{
     "src": "server.ts",
     "use": "@vercel/node"
-  }],
-  "routes": [{
-    "src": "/.*",
-    "dest": "server.ts"
-  }]
-}
+    }],
+    "routes": [{
+      "src": "/.*",
+      "dest": "server.ts"
+      }]
+    }
\ No newline at end of file