Preview:
const LOCAL_STORAGE_KEY = "task-list"

function TodoList() {
  const [todoList, setTodoList] = useState(() => {
    return JSON.parse(localStorage.getItem(LOCAL_STORAGE_KEY)) || []
  });
    
  useEffect(() => {
    localStorage.setItem(LOCAL_STORAGE_KEY, JSON.stringify(todoList));
  }, [todoList]);

  ...
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