file index changed to class component

backend/.env

 MONGO_URL='mongodb://localhost:27017'
-PORT='3000'
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+PORT='8002'
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backend/src/index.ts

@@ -6,19 +6,34 @@ import {UsersRouter} from './routes/user';
 import { CommentController } from './controllers/comments';
 import { PostsController } from './controllers/posts';
 
-mongo.run();
 
-const app: Express = express();
-app.use(json());
-app.use(cors());
-app.use(urlencoded({extended: true}));
+class App {
+    private app: Express
+    constructor() {
+        this.app = express()
+        this.app.use(express.json())
+        this.app.use(express.static('public'))
+        this.app.use(express.urlencoded({extended: true}));
+        this.app.use(cors())
+    }
 
-app.use(express.static('public/uploads'));
-app.use('/users', UsersRouter);
-app.use('/posts', new PostsController().getRouter())
-app.use('/comments', new CommentController().getRouter())
-app.use('/comments', new CommentController().getRouter())
+    public init = async (): Promise<void> => {
+        try {
+            await mongo.init()
+            process.on('exit', () => {
+                mongo.close()
+            })
+			this.app.use('/posts', new PostsController().getRouter())
+			this.app.use('/users', UsersRouter)
+			this.app.use('/comments', new CommentController().getRouter())
+            this.app.listen(process.env.PORT, () => {
+                console.log(`Server is running on port ${process.env.PORT}`)
+            })
+        } catch(err: unknown) {
+            console.log(err)
+        }
+    }
+}
 
-app.listen(process.env.PORT, () => {
-	console.log(`App started on port ${process.env.PORT}`);
-});
+const app = new App()
+app.init()
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