diff --git a/frontend/src/app.d.ts b/frontend/src/app.d.ts
index 08dc1b5..4139f96 100644
--- a/frontend/src/app.d.ts
+++ b/frontend/src/app.d.ts
@@ -9,6 +9,10 @@ declare global {
 			apiClient?: ApiClient;
 			authToken: string | null;
 			isAdmin: boolean;
+			flash?: {
+				type: 'success';
+				message: string;
+			};
 		}
 		// interface PageData {}
 		// interface PageState {}