diff --git a/tools/test-js-with-node b/tools/test-js-with-node
index 78bc31d540..8ffcfd9d0a 100755
--- a/tools/test-js-with-node
+++ b/tools/test-js-with-node
@@ -186,7 +186,7 @@ EXEMPT_FILES = make_set(
         "web/src/resize_handler.js",
         "web/src/rows.ts",
         "web/src/scheduled_messages.ts",
-        "web/src/scheduled_messages_feed_ui.js",
+        "web/src/scheduled_messages_feed_ui.ts",
         "web/src/scheduled_messages_overlay_ui.js",
         "web/src/scheduled_messages_popover.js",
         "web/src/scheduled_messages_ui.js",
diff --git a/web/src/scheduled_messages.ts b/web/src/scheduled_messages.ts
index 809e7c14f8..8b180c007e 100644
--- a/web/src/scheduled_messages.ts
+++ b/web/src/scheduled_messages.ts
@@ -2,7 +2,7 @@ import * as channel from "./channel";
 import {$t} from "./i18n";
 import * as timerender from "./timerender";
 
-type ScheduledMessage = {
+export type ScheduledMessage = {
     scheduled_message_id: number;
     content: string;
     rendered_content: string;
diff --git a/web/src/scheduled_messages_feed_ui.js b/web/src/scheduled_messages_feed_ui.ts
similarity index 93%
rename from web/src/scheduled_messages_feed_ui.js
rename to web/src/scheduled_messages_feed_ui.ts
index d7e9a8fdb2..af8864f935 100644
--- a/web/src/scheduled_messages_feed_ui.js
+++ b/web/src/scheduled_messages_feed_ui.ts
@@ -4,9 +4,10 @@ import render_scheduled_messages_indicator from "../templates/scheduled_messages
 
 import * as narrow_state from "./narrow_state";
 import * as scheduled_messages from "./scheduled_messages";
+import type {ScheduledMessage} from "./scheduled_messages";
 import * as util from "./util";
 
-function get_scheduled_messages_matching_narrow() {
+function get_scheduled_messages_matching_narrow(): ScheduledMessage[] {
     const scheduled_messages_list = [...scheduled_messages.scheduled_messages_data.values()];
     const filter = narrow_state.filter();
     const is_conversation_view = filter === undefined ? false : filter.is_conversation_view();
@@ -55,7 +56,7 @@ function get_scheduled_messages_matching_narrow() {
     return matching_scheduled_messages;
 }
 
-export function update_schedule_message_indicator() {
+export function update_schedule_message_indicator(): void {
     $("#scheduled_message_indicator").empty();
     const matching_scheduled_messages = get_scheduled_messages_matching_narrow();
     const scheduled_message_count = matching_scheduled_messages.length;