Avoid spurious error log when waiting for contact syncs

ts/background.ts

@@ -1726,9 +1726,9 @@ export async function startApp(): Promise<void> {
         log.info(`${logId}: postRegistrationSyncs not complete, sending sync`);
 
         setIsInitialContactSync(true);
-        const syncRequest = await sendSyncRequests();
+        contactSyncComplete = waitForEvent('contactSync:complete');
+        drop(sendSyncRequests());
         hasSentSyncRequests = true;
-        contactSyncComplete = syncRequest.contactSyncComplete;
       }
 
       // 4. Download (or resume download) of link & sync backup

ts/textsecure/syncRequests.ts

@@ -1,17 +1,12 @@
 // Copyright 2025 Signal Messenger, LLC
 // SPDX-License-Identifier: AGPL-3.0-only
 
-import { waitForEvent } from '../shims/events';
 import * as log from '../logging/log';
 import { singleProtoJobQueue } from '../jobs/singleProtoJobQueue';
 import MessageSender from './SendMessage';
 import { toLogFormat } from '../types/errors';
 
-export async function sendSyncRequests(
-  timeout?: number
-): Promise<{ contactSyncComplete: Promise<void> }> {
-  const contactSyncComplete = waitForEvent('contactSync:complete', timeout);
-
+export async function sendSyncRequests(): Promise<void> {
   log.info('sendSyncRequests: sending sync requests');
   try {
     await Promise.all([
@@ -28,5 +23,4 @@ export async function sendSyncRequests(
     );
     throw error;
   }
-  return { contactSyncComplete };
 }

ts/util/createIPCEvents.ts

@@ -54,6 +54,7 @@ import type {
 import type { SystemTraySetting } from '../types/SystemTraySetting';
 import { drop } from './drop';
 import { sendSyncRequests } from '../textsecure/syncRequests';
+import { waitForEvent } from '../shims/events';
 
 type SentMediaQualityType = 'standard' | 'high';
 type NotificationSettingType = 'message' | 'name' | 'count' | 'off';
@@ -490,9 +491,11 @@ export function createIPCEvents(
 
     isPrimary: () => window.textsecure.storage.user.getDeviceId() === 1,
     syncRequest: async () => {
-      const { contactSyncComplete } = await sendSyncRequests(
+      const contactSyncComplete = waitForEvent(
+        'contactSync:complete',
         5 * durations.MINUTE
       );
+      await sendSyncRequests();
       return contactSyncComplete;
     },
     getLastSyncTime: () => window.storage.get('synced_at'),