Notifications for a few merge-related scenarios

ts/util/getStringForConversationMerge.ts

@@ -0,0 +1,25 @@
+// Copyright 2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import type { LocalizerType } from '../types/Util';
+
+export function getStringForConversationMerge({
+  obsoleteConversationTitle,
+  conversationTitle,
+  i18n,
+}: {
+  obsoleteConversationTitle: string | undefined;
+  conversationTitle: string;
+  i18n: LocalizerType;
+}): string {
+  if (!obsoleteConversationTitle) {
+    return i18n('icu:ConversationMerge--notification--no-e164', {
+      conversationTitle,
+    });
+  }
+
+  return i18n('icu:ConversationMerge--notification', {
+    obsoleteConversationTitle,
+    conversationTitle,
+  });
+}