Port a commands and utils modules from getting-started

app.js

@@ -1,5 +1,10 @@
 import 'dotenv/config';
 import express from 'express';
+import { verifyDiscordRequest } from './utils.js';
+import {
+    TEST_COMMAND,
+    hasGuildCommands,
+} from './commands.js';
 
 // Create an express app
 const app = express();
@@ -8,8 +13,15 @@ const app = express();
 const PORT = process.env.PORT || 3000;
 
 // Parse request body and verifies incoming requests using discord-interactions package
-app.use(express.json({ verify: VerifyDiscordRequest(process.env.PUBLIC_KEY) }));
+app.use(express.json({
+    verify: verifyDiscordRequest(process.env.PUBLIC_KEY)
+}));
 
 app.listen(PORT, () => {
     console.log('Listening on port', PORT);
+
+    // Check if guild commands from commands.js are installed (if not, install them)
+    hasGuildCommands(process.env.APP_ID, process.env.GUILD_ID, [
+        TEST_COMMAND,
+    ]);
 });