diff --git a/packages/desktop-client/src/components/transactions/TransactionsTable.jsx b/packages/desktop-client/src/components/transactions/TransactionsTable.jsx
index 34c684b472..6215a57fb3 100644
--- a/packages/desktop-client/src/components/transactions/TransactionsTable.jsx
+++ b/packages/desktop-client/src/components/transactions/TransactionsTable.jsx
@@ -2094,7 +2094,7 @@ export const TransactionTable = forwardRef((props, ref) => {
       result = props.transactions.filter((t, idx) => {
         if (t.parent_id) {
           if (idx >= index) {
-            return splitsExpanded.expanded(t.parent_id);
+            return splitsExpanded.isExpanded(t.parent_id);
           } else if (prevSplitsExpanded.current) {
             return prevSplitsExpanded.current.expanded(t.parent_id);
           }
@@ -2113,7 +2113,7 @@ export const TransactionTable = forwardRef((props, ref) => {
 
       result = props.transactions.filter(t => {
         if (t.parent_id) {
-          return splitsExpanded.expanded(t.parent_id);
+          return splitsExpanded.isExpanded(t.parent_id);
         }
         return true;
       });
@@ -2584,7 +2584,7 @@ export const TransactionTable = forwardRef((props, ref) => {
       transactionsByParent={transactionsByParent}
       transferAccountsByTransaction={transferAccountsByTransaction}
       selectedItems={selectedItems}
-      isExpanded={splitsExpanded.expanded}
+      isExpanded={splitsExpanded.isExpanded}
       onSave={onSave}
       onDelete={onDelete}
       onDuplicate={onDuplicate}
diff --git a/packages/desktop-client/src/hooks/useSplitsExpanded.jsx b/packages/desktop-client/src/hooks/useSplitsExpanded.jsx
deleted file mode 100644
index 8b8bb4ed24..0000000000
--- a/packages/desktop-client/src/hooks/useSplitsExpanded.jsx
+++ /dev/null
@@ -1,117 +0,0 @@
-import React, {
-  createContext,
-  useMemo,
-  useEffect,
-  useContext,
-  useReducer,
-} from 'react';
-import { useSelector, useDispatch } from 'react-redux';
-
-const SplitsExpandedContext = createContext(null);
-
-export function useSplitsExpanded() {
-  const data = useContext(SplitsExpandedContext);
-
-  return useMemo(
-    () => ({
-      ...data,
-      expanded: id =>
-        data.state.mode === 'collapse'
-          ? !data.state.ids.has(id)
-          : data.state.ids.has(id),
-    }),
-    [data],
-  );
-}
-
-export function SplitsExpandedProvider({ children, initialMode = 'expand' }) {
-  const cachedState = useSelector(state => state.app.lastSplitState);
-  const reduxDispatch = useDispatch();
-
-  const [state, dispatch] = useReducer(
-    (state, action) => {
-      switch (action.type) {
-        case 'toggle-split': {
-          const ids = new Set([...state.ids]);
-          const { id } = action;
-          if (ids.has(id)) {
-            ids.delete(id);
-          } else {
-            ids.add(id);
-          }
-          return { ...state, ids };
-        }
-        case 'open-split': {
-          const ids = new Set([...state.ids]);
-          const { id } = action;
-          if (state.mode === 'collapse') {
-            ids.delete(id);
-          } else {
-            ids.add(id);
-          }
-          return { ...state, ids };
-        }
-        case 'close-splits': {
-          const ids = new Set([...state.ids]);
-          action.ids.forEach(id => {
-            if (state.mode === 'collapse') {
-              ids.add(id);
-            } else {
-              ids.delete(id);
-            }
-          });
-          return { ...state, ids };
-        }
-        case 'set-mode': {
-          return {
-            ...state,
-            mode: action.mode,
-            ids: new Set(),
-            transitionId: null,
-          };
-        }
-        case 'switch-mode':
-          if (state.transitionId != null) {
-            // You can only transition once at a time
-            return state;
-          }
-
-          return {
-            ...state,
-            mode: state.mode === 'expand' ? 'collapse' : 'expand',
-            transitionId: action.id,
-            ids: new Set(),
-          };
-        case 'finish-switch-mode':
-          return { ...state, transitionId: null };
-        default:
-          throw new Error('Unknown action type: ' + action.type);
-      }
-    },
-    cachedState.current || { ids: new Set(), mode: initialMode },
-  );
-
-  useEffect(() => {
-    if (state.transitionId != null) {
-      // This timeout allows animations to finish
-      setTimeout(() => {
-        dispatch({ type: 'finish-switch-mode' });
-      }, 250);
-    }
-  }, [state.transitionId]);
-
-  useEffect(() => {
-    // In a finished state, cache the state
-    if (state.transitionId == null) {
-      reduxDispatch({ type: 'SET_LAST_SPLIT_STATE', splitState: state });
-    }
-  }, [reduxDispatch, state]);
-
-  const value = useMemo(() => ({ state, dispatch }), [state, dispatch]);
-
-  return (
-    <SplitsExpandedContext.Provider value={value}>
-      {children}
-    </SplitsExpandedContext.Provider>
-  );
-}
diff --git a/packages/desktop-client/src/hooks/useSplitsExpanded.tsx b/packages/desktop-client/src/hooks/useSplitsExpanded.tsx
new file mode 100644
index 0000000000..5f6068e674
--- /dev/null
+++ b/packages/desktop-client/src/hooks/useSplitsExpanded.tsx
@@ -0,0 +1,178 @@
+import React, {
+  createContext,
+  useMemo,
+  useEffect,
+  useContext,
+  useReducer,
+  type ReactNode,
+} from 'react';
+import { useSelector, useDispatch } from 'react-redux';
+
+import { type SplitState } from 'loot-core/client/state-types/app';
+
+type SplitsExpandedState = SplitState & {
+  transitionId?: string;
+};
+
+type SplitsExpandedAction =
+  | {
+      type: 'toggle-split';
+      id: string;
+    }
+  | {
+      type: 'open-split';
+      id: string;
+    }
+  | {
+      type: 'close-splits';
+      ids: string[];
+    }
+  | {
+      type: 'set-mode';
+      mode: 'expand' | 'collapse';
+    }
+  | {
+      type: 'switch-mode';
+      id: string;
+    }
+  | {
+      type: 'finish-switch-mode';
+    };
+
+type SplitsExpandedContextValue = {
+  state: SplitsExpandedState;
+  dispatch: (action: SplitsExpandedAction) => void;
+};
+const SplitsExpandedContext = createContext<
+  SplitsExpandedContextValue | undefined
+>(undefined);
+
+type UseSplitsExpandedResult = SplitsExpandedContextValue & {
+  isExpanded: (id: string) => boolean;
+};
+
+export function useSplitsExpanded(): UseSplitsExpandedResult {
+  const data = useContext(SplitsExpandedContext);
+
+  if (!data) {
+    throw new Error(
+      'useSplitsExpanded must be used within a SplitsExpandedProvider',
+    );
+  }
+
+  return useMemo(
+    () => ({
+      ...data,
+      isExpanded: id =>
+        data.state.mode === 'collapse'
+          ? !data.state.ids.has(id)
+          : data.state.ids.has(id),
+    }),
+    [data],
+  );
+}
+
+function splitsExpandedReducer(
+  state: SplitsExpandedState,
+  action: SplitsExpandedAction,
+): SplitsExpandedState {
+  switch (action.type) {
+    case 'toggle-split': {
+      const ids = new Set([...state.ids]);
+      const { id } = action;
+      if (ids.has(id)) {
+        ids.delete(id);
+      } else {
+        ids.add(id);
+      }
+      return { ...state, ids };
+    }
+    case 'open-split': {
+      const ids = new Set([...state.ids]);
+      const { id } = action;
+      if (state.mode === 'collapse') {
+        ids.delete(id);
+      } else {
+        ids.add(id);
+      }
+      return { ...state, ids };
+    }
+    case 'close-splits': {
+      const ids = new Set([...state.ids]);
+      action.ids.forEach(id => {
+        if (state.mode === 'collapse') {
+          ids.add(id);
+        } else {
+          ids.delete(id);
+        }
+      });
+      return { ...state, ids };
+    }
+    case 'set-mode': {
+      return {
+        ...state,
+        mode: action.mode,
+        ids: new Set(),
+        transitionId: undefined,
+      };
+    }
+    case 'switch-mode':
+      if (state.transitionId != null) {
+        // You can only transition once at a time
+        return state;
+      }
+
+      return {
+        ...state,
+        mode: state.mode === 'expand' ? 'collapse' : 'expand',
+        transitionId: action.id,
+        ids: new Set(),
+      };
+    case 'finish-switch-mode':
+      return { ...state, transitionId: undefined };
+    default:
+      throw new Error(`Unknown action: ${JSON.stringify(action)}`);
+  }
+}
+
+type SplitsExpandedProviderProps = {
+  children: ReactNode;
+  initialMode?: 'expand' | 'collapse';
+};
+
+export function SplitsExpandedProvider({
+  children,
+  initialMode = 'expand',
+}: SplitsExpandedProviderProps) {
+  const cachedState = useSelector(state => state.app.lastSplitState);
+  const reduxDispatch = useDispatch();
+
+  const [state, dispatch] = useReducer<typeof splitsExpandedReducer>(
+    splitsExpandedReducer,
+    cachedState.current || { ids: new Set(), mode: initialMode },
+  );
+
+  useEffect(() => {
+    if (state.transitionId != null) {
+      // This timeout allows animations to finish
+      setTimeout(() => {
+        dispatch({ type: 'finish-switch-mode' });
+      }, 250);
+    }
+  }, [state.transitionId]);
+
+  useEffect(() => {
+    // In a finished state, cache the state
+    if (state.transitionId == null) {
+      reduxDispatch({ type: 'SET_LAST_SPLIT_STATE', splitState: state });
+    }
+  }, [reduxDispatch, state]);
+
+  const value = useMemo(() => ({ state, dispatch }), [state, dispatch]);
+
+  return (
+    <SplitsExpandedContext.Provider value={value}>
+      {children}
+    </SplitsExpandedContext.Provider>
+  );
+}