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next.jsでreactのcreateContextをviewとデータを切り離して綺麗に書く方法

Posted at

開発環境:
macOSX catalina バージョン10.15.7
visualStudioCode
react
next.js

createContextを綺麗に書く方法を教わったので、備忘録

以下のような書き方をして、Contextを定義する
そうすることによって、viewとデータを切り離すことができ、可読性が高まるとのこと

import React, { useReducer, createContext } from "react";
import reducer from "./reducer";

const tagList = [];

const MyContext = createContext("");
const Store = ({ children }) => {
  const [state, dispatch] = useReducer(reducer, tagList);
  return (
    <MyContext.Provider value={{ state, dispatch }}>
      {children}
    </MyContext.Provider>
  );
};

export { MyContext, Store };

以下のようにContextを下位コンポーネントにつなぐ

import "../styles/globals.css";
import React from "react";
import { Store } from "../store/store";

function MyApp({ Component, pageProps }) {
  return (
    <Store>
      <Component {...pageProps} />
    </Store>
  );
}

export default MyApp;
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