diff --git a/web/src/filter.ts b/web/src/filter.ts
index cdfb493690..e6ed35bba6 100644
--- a/web/src/filter.ts
+++ b/web/src/filter.ts
@@ -233,7 +233,7 @@ function message_matches_search_term(message: Message, operator: string, operand
     return true; // unknown operators return true (effectively ignored)
 }
 
-type Term = {
+export type Term = {
     negated?: boolean;
     operator: string;
     operand: string;
diff --git a/web/src/page_params.ts b/web/src/page_params.ts
index e57cb6faa4..068ff2c43f 100644
--- a/web/src/page_params.ts
+++ b/web/src/page_params.ts
@@ -1,5 +1,6 @@
 import $ from "jquery";
 
+import type {Term} from "./filter";
 import type {GroupPermissionSetting} from "./types";
 
 const t1 = performance.now();
@@ -42,6 +43,7 @@ export const page_params: {
     max_logo_file_size_mib: number;
     muted_users: {id: number; timestamp: number}[];
     narrow_stream?: string;
+    narrow: Term[];
     needs_tutorial: boolean;
     page_load_time: number;
     promote_sponsoring_zulip: boolean;