Refactored code base

Author: the-code-genin

lib/response-payload.ts

@@ -1,5 +1,5 @@
 export default interface ResponsePayload<T> {
-    data?: T | T[],
+    data?: T,
     total?: number,
     per_page?: number,
     current_page?: number,

lib/upload-file.ts

@@ -3,11 +3,11 @@ import { NotFoundError, ServerError } from '../lib/errors';
 
 export default (app: Application) => {
     app.use((req: Request, res: Response, next: NextFunction) => {
-        res.status(404).json(NotFoundError());
+        return NotFoundError(res);
     });
 
     app.use((err: Error, req: Request, res: Response, next: NextFunction) => {
         console.error(err.stack);
-        res.status(500).json(ServerError(err.message));
+        return ServerError(res, err.message);
     });
 }