Convert notification requests actions and reducers to Typescript (#31866)

app/javascript/mastodon/models/notification_request.ts

@@ -0,0 +1,19 @@
+import type { ApiNotificationRequestJSON } from 'mastodon/api_types/notifications';
+
+export interface NotificationRequest
+  extends Omit<ApiNotificationRequestJSON, 'account' | 'notifications_count'> {
+  account_id: string;
+  notifications_count: number;
+}
+
+export function createNotificationRequestFromJSON(
+  requestJSON: ApiNotificationRequestJSON,
+): NotificationRequest {
+  const { account, notifications_count, ...request } = requestJSON;
+
+  return {
+    account_id: account.id,
+    notifications_count: +notifications_count,
+    ...request,
+  };
+}