diff --git a/native/redux/persist.js b/native/redux/persist.js
--- a/native/redux/persist.js
+++ b/native/redux/persist.js
@@ -13,8 +13,13 @@
 import { unshimMessageStore } from 'lib/shared/unshim-utils';
 import { defaultEnabledApps } from 'lib/types/enabled-apps';
 import { defaultCalendarFilters } from 'lib/types/filter-types';
-import { messageTypes } from 'lib/types/message-types';
-import type { ClientDBMessageStoreOperation } from 'lib/types/message-types';
+import {
+  type LocalMessageInfo,
+  type MessageStore,
+  messageTypes,
+  type ClientDBMessageStoreOperation,
+  type RawMessageInfo,
+} from 'lib/types/message-types';
 import { defaultConnectionInfo } from 'lib/types/socket-types';
 import { translateRawMessageInfoToClientDBMessageInfo } from 'lib/utils/message-ops-utils';
 import { convertThreadStoreOperationsToClientDBOperations } from 'lib/utils/thread-ops-utils';
@@ -376,8 +381,22 @@
 // this transformation should be executed in the `whitelist` property of the
 // `config` object that's passed to `createTransform(...)`.
 // eslint-disable-next-line no-unused-vars
+type PersistedThreadMessageInfo = {
+  +startReached: boolean,
+  +lastNavigatedTo: number,
+  +lastPruned: number,
+};
+type PersistedMessageStore = {
+  +local: { +[id: string]: LocalMessageInfo },
+  +currentAsOf: number,
+  +threads: { +[threadID: string]: PersistedThreadMessageInfo },
+};
+type RehydratedMessageStore = $Diff<
+  MessageStore,
+  { +messages: { +[id: string]: RawMessageInfo } },
+>;
 const messageStoreMessagesBlocklistTransform: Transform = createTransform(
-  state => {
+  (state: MessageStore): PersistedMessageStore => {
     const { messages, threads, ...messageStoreSansMessages } = state;
     // We also do not want to persist `messageStore.threads[ID].messageIDs`
     // because they can be deterministically computed based on messages we have
@@ -389,7 +408,7 @@
     }
     return { ...messageStoreSansMessages, threads: threadsToPersist };
   },
-  state => {
+  (state: PersistedMessageStore): RehydratedMessageStore => {
     const { threads: persistedThreads, ...messageStore } = state;
     const threads = {};
     for (const threadID in persistedThreads) {