Just ignore type errors and use findLast

src/components/dms/MessagesListHeader.tsx

@@ -157,12 +157,10 @@ function HeaderReady({
         moderation.ui('displayName'),
       )
 
-  const latestMessageFromOther = convoState.items
-    .reverse()
-    .find(
-      item =>
-        item.type === 'message' && item.message.sender.did === profile.did,
-    )
+  // @ts-ignore findLast is polyfilled - esb
+  const latestMessageFromOther = convoState.items.findLast(
+    item => item.type === 'message' && item.message.sender.did === profile.did,
+  )
 
   const latestReportableMessage =
     latestMessageFromOther?.type === 'message'

src/state/cache/thread-mutes.tsx

@@ -69,9 +69,8 @@ function useMigrateMutes(setThreadMute: SetStateContext) {
         while (!cancelled) {
           const threads = persisted.get('mutedThreads')
 
-          const root = threads
-            .reverse()
-            .find(uri => uri.includes(currentAccount.did))
+          // @ts-ignore findLast is polyfilled - esb
+          const root = threads.findLast(uri => uri.includes(currentAccount.did))
 
           if (!root) break