diff --git a/backend/src/common/http.js b/backend/src/common/http.js
index 388d1052..ef6258b0 100644
--- a/backend/src/common/http.js
+++ b/backend/src/common/http.js
@@ -1,3 +1,5 @@
+// @ts-check
+
 import axios from "axios";
 
 /**