diff --git a/web/src/buddy_list.ts b/web/src/buddy_list.ts
index 1786c8c0b4..8754e59b02 100644
--- a/web/src/buddy_list.ts
+++ b/web/src/buddy_list.ts
@@ -154,75 +154,79 @@ export class BuddyList extends BuddyListConf {
     $other_users_container = $(this.other_user_list_selector);
 
     initialize_tooltips(): void {
-        $("#right-sidebar").on("mouseenter", ".buddy-list-heading", (e) => {
-            e.stopPropagation();
-            const $elem = $(e.currentTarget);
-            let placement: "left" | "auto" = "left";
-            if (window.innerWidth < media_breakpoints_num.md) {
-                // On small devices display tooltips based on available space.
-                // This will default to "bottom" placement for this tooltip.
-                placement = "auto";
-            }
-            tippy($elem[0], {
-                // Because the buddy list subheadings are potential click targets
-                // for purposes having nothing to do with the subscriber count
-                // (collapsing/expanding), we delay showing the tooltip until the
-                // user lingers a bit longer.
-                delay: INTERACTIVE_HOVER_DELAY,
-                // Don't show tooltip on touch devices (99% mobile) since touch
-                // pressing on users in the left or right sidebar leads to narrow
-                // being changed and the sidebar is hidden. So, there is no user
-                // displayed to show tooltip for. It is safe to show the tooltip
-                // on long press but it not worth the inconvenience of having a
-                // tooltip hanging around on a small mobile screen if anything
-                // going wrong.
-                touch: false,
-                arrow: true,
-                placement,
-                showOnCreate: true,
-                onShow(instance) {
-                    let tooltip_text;
-                    const current_sub = narrow_state.stream_sub();
-                    const pm_ids_set = narrow_state.pm_ids_set();
-                    const subscriber_count = total_subscriber_count(current_sub, pm_ids_set);
-                    const elem_id = $elem.attr("id");
-                    if (elem_id === "buddy-list-users-matching-view-section-heading") {
-                        if (current_sub) {
-                            tooltip_text = $t(
-                                {
-                                    defaultMessage:
-                                        "{N, plural, one {# subscriber} other {# subscribers}}",
-                                },
-                                {N: subscriber_count},
-                            );
+        $("#right-sidebar").on(
+            "mouseenter",
+            ".buddy-list-heading",
+            function (this: HTMLElement, e) {
+                e.stopPropagation();
+                const $elem = $(this);
+                let placement: "left" | "auto" = "left";
+                if (window.innerWidth < media_breakpoints_num.md) {
+                    // On small devices display tooltips based on available space.
+                    // This will default to "bottom" placement for this tooltip.
+                    placement = "auto";
+                }
+                tippy($elem[0], {
+                    // Because the buddy list subheadings are potential click targets
+                    // for purposes having nothing to do with the subscriber count
+                    // (collapsing/expanding), we delay showing the tooltip until the
+                    // user lingers a bit longer.
+                    delay: INTERACTIVE_HOVER_DELAY,
+                    // Don't show tooltip on touch devices (99% mobile) since touch
+                    // pressing on users in the left or right sidebar leads to narrow
+                    // being changed and the sidebar is hidden. So, there is no user
+                    // displayed to show tooltip for. It is safe to show the tooltip
+                    // on long press but it not worth the inconvenience of having a
+                    // tooltip hanging around on a small mobile screen if anything
+                    // going wrong.
+                    touch: false,
+                    arrow: true,
+                    placement,
+                    showOnCreate: true,
+                    onShow(instance) {
+                        let tooltip_text;
+                        const current_sub = narrow_state.stream_sub();
+                        const pm_ids_set = narrow_state.pm_ids_set();
+                        const subscriber_count = total_subscriber_count(current_sub, pm_ids_set);
+                        const elem_id = $elem.attr("id");
+                        if (elem_id === "buddy-list-users-matching-view-section-heading") {
+                            if (current_sub) {
+                                tooltip_text = $t(
+                                    {
+                                        defaultMessage:
+                                            "{N, plural, one {# subscriber} other {# subscribers}}",
+                                    },
+                                    {N: subscriber_count},
+                                );
+                            } else {
+                                tooltip_text = $t(
+                                    {
+                                        defaultMessage:
+                                            "{N, plural, one {# participant} other {# participants}}",
+                                    },
+                                    {N: subscriber_count},
+                                );
+                            }
                         } else {
+                            const total_user_count = people.get_active_human_count();
+                            const other_users_count = total_user_count - subscriber_count;
                             tooltip_text = $t(
                                 {
                                     defaultMessage:
-                                        "{N, plural, one {# participant} other {# participants}}",
+                                        "{N, plural, one {# other user} other {# other users}}",
                                 },
-                                {N: subscriber_count},
+                                {N: other_users_count},
                             );
                         }
-                    } else {
-                        const total_user_count = people.get_active_human_count();
-                        const other_users_count = total_user_count - subscriber_count;
-                        tooltip_text = $t(
-                            {
-                                defaultMessage:
-                                    "{N, plural, one {# other user} other {# other users}}",
-                            },
-                            {N: other_users_count},
-                        );
-                    }
-                    instance.setContent(tooltip_text);
-                },
-                onHidden(instance) {
-                    instance.destroy();
-                },
-                appendTo: () => document.body,
-            });
-        });
+                        instance.setContent(tooltip_text);
+                    },
+                    onHidden(instance) {
+                        instance.destroy();
+                    },
+                    appendTo: () => document.body,
+                });
+            },
+        );
     }
 
     populate(opts: {all_user_ids: number[]}): void {