diff --git a/native/chat/message-list-thread-search.react.js b/native/chat/message-list-thread-search.react.js
--- a/native/chat/message-list-thread-search.react.js
+++ b/native/chat/message-list-thread-search.react.js
@@ -40,7 +40,7 @@
     const styles = useStyles(unboundStyles);
 
     const [userListItems, nonFriends] = React.useMemo(() => {
-      const nonFriendsSet = new Set();
+      const nonFriendsSet = new Set<string>();
       if (userInfoInputArray.length > 0) {
         return [userSearchResults, nonFriendsSet];
       }
diff --git a/native/chat/thread-screen-pruner.react.js b/native/chat/thread-screen-pruner.react.js
--- a/native/chat/thread-screen-pruner.react.js
+++ b/native/chat/thread-screen-pruner.react.js
@@ -66,7 +66,7 @@
     }, [navContext]);
 
     const inStackThreadIDs = React.useMemo(() => {
-      const threadIDs = new Set();
+      const threadIDs = new Set<string>();
       if (!chatRouteState) {
         return threadIDs;
       }
diff --git a/native/components/node-height-measurer.react.js b/native/components/node-height-measurer.react.js
--- a/native/components/node-height-measurer.react.js
+++ b/native/components/node-height-measurer.react.js
@@ -92,8 +92,14 @@
       mergeItemWithHeight,
       initialMeasuredHeights,
     } = props;
-    const unmeasurableItems = new Map();
-    const measurableItems = new Map();
+    const unmeasurableItems = new Map<
+      string,
+      MergedItemPair<InnerItem, InnerMergedItem>,
+    >();
+    const measurableItems = new Map<
+      string,
+      MergedItemPair<InnerItem, InnerMergedItem>,
+    >();
     const measuredHeights = initialMeasuredHeights
       ? new Map(initialMeasuredHeights)
       : new Map();
@@ -154,7 +160,7 @@
 
     const { listData, itemToMeasureKey, itemToDummy } = props;
 
-    const toMeasure = new Map();
+    const toMeasure = new Map<string, React.MixedElement>();
     if (listData) {
       for (const item of listData) {
         const measureKey = itemToMeasureKey(item);
@@ -353,8 +359,8 @@
       measurableItemsChanged ||
       unmeasurableItemsChanged
     ) {
-      const currentMeasurableItems = new Map();
-      const currentUnmeasurableItems = new Map();
+      const currentMeasurableItems = new Map<string, Item>();
+      const currentUnmeasurableItems = new Map<string, Item>();
       if (listData) {
         for (const item of listData) {
           const id = itemToID(item);
diff --git a/native/input/input-state-container.react.js b/native/input/input-state-container.react.js
--- a/native/input/input-state-container.react.js
+++ b/native/input/input-state-container.react.js
@@ -1729,7 +1729,7 @@
     const mediaReportsEnabled = useIsReportEnabled('mediaReports');
     const staffCanSee = useStaffCanSee();
     const textMessageCreationSideEffectsFunc =
-      useMessageCreationSideEffectsFunc(messageTypes.TEXT);
+      useMessageCreationSideEffectsFunc<RawTextMessageInfo>(messageTypes.TEXT);
 
     return (
       <InputStateContainer
diff --git a/native/navigation/community-drawer-content.react.js b/native/navigation/community-drawer-content.react.js
--- a/native/navigation/community-drawer-content.react.js
+++ b/native/navigation/community-drawer-content.react.js
@@ -64,7 +64,7 @@
     })();
   }, [callFetchPrimaryLinks, dispatchActionPromise, drawerStatus]);
 
-  const [expanded, setExpanded] = React.useState(() => {
+  const [expanded, setExpanded] = React.useState<Set<string>>(() => {
     if (communitiesSuffixed.length === 1) {
       return new Set([communitiesSuffixed[0].id]);
     }
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -267,7 +267,7 @@
   },
 );
 
-const magicStrings = new Set();
+const magicStrings = new Set<string>();
 for (const theme in colors) {
   for (const magicString in colors[theme]) {
     magicStrings.add(magicString);