all routes changed to typescript

backend/src/services/WhatsappService/ListWhatsAppsService.ts

@@ -0,0 +1,13 @@
+import Whatsapp from "../../models/Whatsapp";
+
+interface Response {
+  whatsapps: Whatsapp[];
+}
+
+const ListWhatsAppsService = async (): Promise<Response> => {
+  const whatsapps = await Whatsapp.findAll();
+
+  return { whatsapps };
+};
+
+export default ListWhatsAppsService;