Remove return, change return type.

src/api/setReservation.ts

@@ -3,5 +3,4 @@ import { InsertReservationType } from 'types/InsertReservationType';
 
 export const setReservation = async (
   reservation: InsertReservationType,
-): Promise<any> =>
-  axios.post('/api/web/reservations/', reservation).then((res) => res);
+): Promise<void> => axios.post('/api/web/reservations/', reservation);