Nextjs問題 - 類型{}上不存在屬性children

Question

我正在使用React和Next.js，以下是我的程式碼，它在children屬性上拋出一個錯誤，錯誤訊息為屬性children在類型{}上不存在

import { NextPage } 從 "next";
import { createContext, useContext, useReducer, Dispatch } from "react";

import { GlobalStatesType } from "../types";
import reducer, { ActionType, initialState } from "../reducers";

export const StateContext = createContext<{
  states: GlobalStatesType;
  dispatch: Dispatch<ActionType>;
}>({
  states: initialState,
  dispatch: () => {},
});


export const StateProvider: NextPage = ({ children }) => {
  const [states, dispatch] = useReducer(reducer, initialState);

  return (
    <StateContext.Provider value={{ states, dispatch }}>
      { children }
    </StateContext.Provider>
  );
};

export const useStatesValue = () => useContext(StateContext);

如何在我導入的next函數的上下文中寫程式碼？

Answer 1

看起來你正在使用TypeScript和Next.js建立一個上下文提供者元件。你遇到的錯誤"屬性'children'在類型'{}'上不存在"，很可能是因為TypeScript在函數元件中無法辨識children屬性。

要解決這個問題，你可以在StateProvider元件中明確定義children屬性的類型。以下是如何做到這一點：

import { NextPage } from "next";
import { createContext, useContext, useReducer, Dispatch, ReactNode } from "react"; // 导入ReactNode类型

import { GlobalStatesType } from "../types";
import reducer, { ActionType, initialState } from "../reducers";

type StateProviderProps = {
  children: ReactNode; // 定义children属性的类型
};

export const StateContext = createContext<{
  states: GlobalStatesType;
  dispatch: Dispatch<ActionType>;
}>({
  states: initialState,
  dispatch: () => {},
});

export const StateProvider: NextPage<StateProviderProps> = ({ children }) => { // 使用StateProviderProps类型
  const [states, dispatch] = useReducer(reducer, initialState);

  return (
    <StateContext.Provider value={{ states, dispatch }}>
      {children} {/* 直接使用children */}
    </StateContext.Provider>
  );
};

export const useStatesValue = () => useContext(StateContext);

透過定義StateProviderProps類型並使用它來指定StateProvider元件中children屬性的類型，你將不再遇到與children屬性相關的TypeScript錯誤。