diff --git a/js/src/admin/Admin.ts b/js/src/admin/Admin.ts
index 7ced37bf5..69376ba9b 100644
--- a/js/src/admin/Admin.ts
+++ b/js/src/admin/Admin.ts
@@ -5,9 +5,22 @@ import Application, {ApplicationData} from '../common/Application';
 import Navigation from '../common/components/Navigation';
 import AdminNav from './components/AdminNav';
 
+type Extension = {
+    description: string;
+    extra: object;
+    icon: {
+        name: string;
+    }
+    id: number;
+    version: string;
+}
+
 export type AdminData = ApplicationData & {
     mysqlVersion: string;
     phpVersion: string;
+    extensions: {
+        [key: string]: Extension;
+    };
     permissions: {
         [key: string]: string[];
     };