refactor: extract notification count into reusable function (#941)

* refactor: extract notification count into reusable function

* refactor: keep useMemo

* refactor: directly return

src/components/Sidebar.tsx

@@ -8,6 +8,7 @@ import { ipcRenderer } from 'electron';
 import React, { useCallback, useContext, useMemo } from 'react';
 import { useNavigate, useLocation } from 'react-router-dom';
 
+import { getNotificationCount } from '../utils/notifications';
 import { Logo } from '../components/Logo';
 import { AppContext } from '../context/App';
 import { Constants } from '../utils/constants';
@@ -33,10 +34,7 @@ export const Sidebar: React.FC = () => {
   }, []);
 
   const notificationsCount = useMemo(() => {
-    return notifications.reduce(
-      (memo, account) => memo + account.notifications.length,
-      0,
-    );
+    return getNotificationCount(notifications);
   }, [notifications]);
 
   const footerButtonClasses =

src/routes/Notifications.tsx

@@ -4,6 +4,7 @@ import { AccountNotifications } from '../components/AccountNotifications';
 import { AllRead } from '../components/AllRead';
 import { AppContext } from '../context/App';
 import { Oops } from '../components/Oops';
+import { getNotificationCount } from '../utils/notifications';
 
 export const NotificationsRoute: React.FC = (props) => {
   const { notifications, requestFailed } = useContext(AppContext);
@@ -12,11 +13,10 @@ export const NotificationsRoute: React.FC = (props) => {
     () => notifications.length > 1,
     [notifications],
   );
-  const notificationsCount = useMemo(
-    () =>
-      notifications.reduce((memo, acc) => memo + acc.notifications.length, 0),
-    [notifications],
-  );
+  const notificationsCount = useMemo(() => {
+    return getNotificationCount(notifications);
+  }, [notifications]);
+
   const hasNotifications = useMemo(
     () => notificationsCount > 0,
     [notificationsCount],

src/utils/notifications.ts

@@ -6,14 +6,18 @@ import { Notification } from '../typesGithub';
 import { AccountNotifications, SettingsState, AuthState } from '../types';
 
 export const setTrayIconColor = (notifications: AccountNotifications[]) => {
-  const allNotificationsCount = notifications.reduce(
-    (memo, acc) => memo + acc.notifications.length,
-    0,
-  );
+  const allNotificationsCount = getNotificationCount(notifications);
 
   updateTrayIcon(allNotificationsCount);
 };
 
+export function getNotificationCount(notifications: AccountNotifications[]) {
+  return notifications.reduce(
+    (memo, acc) => memo + acc.notifications.length,
+    0,
+  );
+}
+
 export const triggerNativeNotifications = (
   previousNotifications: AccountNotifications[],
   newNotifications: AccountNotifications[],