test: add TS checks and fix issues

services/mocks/caproverServer.ts

@@ -1,5 +1,10 @@
+import {
+  http,
+  HttpResponse,
+  HttpResponseResolver,
+  PathParams
+} from "msw";
 import { setupServer } from "msw/node";
-import { http, HttpResponse, HttpResponseResolver, PathParams } from "msw";
 import appsFixtures from "./apps.fixtures.json";
 
 export const CAPROVER_TEST_DOMAIN = "caprover.test";
@@ -14,7 +19,7 @@ const withAuth = (resolver: HttpResponseResolver): HttpResponseResolver => {
       headers.get("x-namespace") !== "captain" ||
       headers.get("x-captain-auth") !== TEST_TOKEN
     ) {
-      return new HttpResponse("", { status: 401 });
+      return HttpResponse.json({}, { status: 401 });
     }
     return resolver(input);
   };