报错信息

Runtime Error
App.js: An immer producer returned a new value *and* modified its draft. Either return a new value *or* modify the draft. (15:4)

  12 | 
  13 | export default function TaskApp() {
  14 |   const [todos, setTodos] = useImmer(
> 15 |     initialTodos
           ^
  16 |   );
  17 | 
  18 |   function handleAddTodo(title) {

报错代码

function handleAddTodo(title) {
    setTodos(todos => todos.push({
      id: nextId++,
      title: title,
      done: false
    }))
  }

这里的错误是由于setTodos参数中的函数体部分没有用大括号括起来，正确如下:

  function handleAddTodo(title) {
    setTodos(todos => {
      todos.push({
        id: nextId++,
        title: title,
        done: false
      })
    })
  }