在狀態中重新排序數組

Question

我使用 zustand 建立一個帶有待辦事項陣列的全域狀態，我有新增、刪除和切換每個待辦事項完成/撤銷的功能。

我還使用 Dnd Kit 拖放每個 ToDo 元件並在全域上下文中對它們重新排序，為此我需要以這種方式在 zustand 儲存中建立一個 reorderTodo 函數：

const handleDragEnd = (event: any) => {
    const { active, over } = event;

    if (active.id !== over.id) {
        const newIndex = filteredTodos.findIndex(
            (todo) => todo.id === over.id
        );
        setFilteredTodos((filteredTodos) => {
            const oldIndex = filteredTodos.findIndex(
                (todo) => todo.id === active.id
            );

            return arrayMove(filteredTodos, oldIndex, newIndex);
        });

        reorderTodo(active.id, newIndex);
    }
};


import { create } from "zustand";

export const useTodosStore = create(() => ({
    todos: [
        { id: 1, text: "Learn TypeScript", done: true },
        { id: 2, text: "Try immer", done: false },
        { id: 3, text: "Tweet about it", done: false },
    ],
    addTodo: (text: string, done: boolean) => {
        useTodosStore.setState((state) => ({
            todos: [
                ...state.todos,
                { id: state.todos.length + 1, text, done: done },
            ],
        }));
    },
    toggleTodo: (id: number) =>
        useTodosStore.setState((state) => ({
            todos: state.todos.map((todo) =>
                todo.id === id ? { ...todo, done: !todo.done } : todo
            ),
        })),
    removeTodo: (id: number) =>
        useTodosStore.setState((state) => ({
            todos: state.todos.filter((todo) => todo.id !== id),
        })),

    reorderTodo: (id: number, position: number) =>
        useTodosStore.setState((state) => {
            const todos = [...state.todos];
            const todo = todos.find((todo) => todo.id === id);
            if (!todo) return;
            const idx = todos.indexOf(todo);
            todos.splice(idx, 1);
            todos.splice(position, 0, todo);
            return { todos };
        }),
}));

它在 VSCode 中給了我一個大的打字稿錯誤：

Argument of type '(state: { todos: { id: number; text: string; done: boolean; }[]; addTodo: (text: string, done: boolean) => void; toggleTodo: (id: number) => void; removeTodo: (id: number) => void; reorderTodo: (id: number, position: number) => void; }) => { ...; } | undefined' is not assignable to parameter of type '{ todos: { id: number; text: string; done: boolean; }[]; addTodo: (text: string, done: boolean) => void; toggleTodo: (id: number) => void; removeTodo: (id: number) => void; reorderTodo: (id: number, position: number) => void; } | Partial<...> | ((state: { ...; }) => { ...; } | Partial<...>)'.
  Type '(state: { todos: { id: number; text: string; done: boolean; }[]; addTodo: (text: string, done: boolean) => void; toggleTodo: (id: number) => void; removeTodo: (id: number) => void; reorderTodo: (id: number, position: number) => void; }) => { ...; } | undefined' is not assignable to type '(state: { todos: { id: number; text: string; done: boolean; }[]; addTodo: (text: string, done: boolean) => void; toggleTodo: (id: number) => void; removeTodo: (id: number) => void; reorderTodo: (id: number, position: number) => void; }) => { ...; } | Partial<...>'.

但是我可以使用yarn dev 在開發模式下運行應用程序，當我想使用yarn build 建立應用程式時，問題就出現了，它在控制台中給了我這個錯誤，因此我也無法部署該應用程式在Netlify/vercel 中

如何建立重新排序函數來修復此錯誤？

Answer 1

問題是 set 方法需要傳回狀態，而您的程式碼在 setState 中傳回 undefined：if (!todo) return;。在這一行中，您可以將程式碼變更為 if (!todo) return { todos };

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