Some updates

src/Store.tsx

@@ -3,8 +3,6 @@ import { ErrorMessage } from './types/ErrorMessage';
 import { Todo } from './types/Todo';
 import { Status } from './types/Status';
 export type Action =
-  | { type: 'download' }
-  | { type: 'downloadSuccess'; todos: Todo[] }
   | { type: 'failure'; errorMessage: ErrorMessage | null }
   | { type: 'closeNotification' }
   | { type: 'filterStatus'; status: Status }
@@ -32,16 +30,6 @@ const initialState: RootState = {
 
 const reducer = (state: RootState, action: Action): RootState => {
   switch (action.type) {
-    case 'download':
-      return {
-        ...state,
-        errorMessage: null,
-      };
-    case 'downloadSuccess':
-      return {
-        ...state,
-        todos: action.todos,
-      };
     case 'failure':
       return {
         ...state,

src/hook/useLocalStorage.ts

@@ -0,0 +1,27 @@
+import { useState } from 'react';
+
+export function useLocalStorage<T>(
+  key: string,
+  startValue: T,
+): [T, (v: T) => void] {
+  const [value, setValue] = useState(() => {
+    const data = localStorage.getItem(key);
+
+    if (data === null) {
+      return startValue;
+    }
+
+    try {
+      return JSON.parse(data);
+    } catch {
+      return startValue;
+    }
+  });
+
+  const save = (newValue: T) => {
+    localStorage.setItem(key, JSON.stringify(newValue));
+    setValue(newValue);
+  };
+
+  return [value, save];
+}