diff --git a/src/public/app/services/protected_session_holder.js b/src/public/app/services/protected_session_holder.ts
similarity index 88%
rename from src/public/app/services/protected_session_holder.js
rename to src/public/app/services/protected_session_holder.ts
index 8fdae303c..9b0287999 100644
--- a/src/public/app/services/protected_session_holder.js
+++ b/src/public/app/services/protected_session_holder.ts
@@ -1,3 +1,4 @@
+import FNote from "../entities/fnote.js";
 import server from "./server.js";
 
 function enableProtectedSession() {
@@ -20,7 +21,7 @@ async function touchProtectedSession() {
     }
 }
 
-function touchProtectedSessionIfNecessary(note) {
+function touchProtectedSessionIfNecessary(note: FNote) {
     if (note && note.isProtected && isProtectedSessionAvailable()) {
         touchProtectedSession();
     }
diff --git a/src/public/app/services/server.ts b/src/public/app/services/server.ts
index c24bb86f7..bfa5fc993 100644
--- a/src/public/app/services/server.ts
+++ b/src/public/app/services/server.ts
@@ -58,7 +58,7 @@ async function get<T>(url: string, componentId?: string) {
     return await call<T>('GET', url, componentId);
 }
 
-async function post<T>(url: string, data: unknown, componentId?: string) {
+async function post<T>(url: string, data?: unknown, componentId?: string) {
     return await call<T>('POST', url, componentId, { data });
 }
 
diff --git a/src/public/app/types.d.ts b/src/public/app/types.d.ts
index 9934211e9..62d507c80 100644
--- a/src/public/app/types.d.ts
+++ b/src/public/app/types.d.ts
@@ -24,6 +24,7 @@ interface CustomGlobals {
     componentId: string;
     csrfToken: string;
     baseApiUrl: string;
+    isProtectedSessionAvailable: boolean;
 }
 
 type RequireMethod = (moduleName: string) => any;