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Next.js & material UIで[Prop className` did not match`]が発生する

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問題

Next.jsアプリでmaterial-UIを使用した際に、[Prop className' did not match' Server 'xx' Client 'xx']が発生する

詳細

  • makeStylesで作成したスタイルの読み込み時に発生
  • 初回レンダリング時には発生しない
  • 変更を加えたり、ページ更新を行うと発生する
  • Server 'xx' Client 'xx'の内容は、Server "makeStyles-mainContainer-1" Client makeStyles-mainContainer-2のように、クラス名に違いが生じている

解決方法

参照:
Material UI公式:サーバーサイドレンダリングについて
上記ページからのリンク:Next.jsのサンプルリポジトリ

サンプルリポジトリの通り、_app.js_document.jsを変更することで解決

pages/_app.js
import React from 'react';
import PropTypes from 'prop-types';
import Head from 'next/head';
import { ThemeProvider } from '@material-ui/core/styles';
import CssBaseline from '@material-ui/core/CssBaseline';
import theme from '../src/theme';

export default function MyApp(props) {
  const { Component, pageProps } = props;

  React.useEffect(() => {
    // Remove the server-side injected CSS.
    const jssStyles = document.querySelector('#jss-server-side');
    if (jssStyles) {
      jssStyles.parentElement.removeChild(jssStyles);
    }
  }, []);

  return (
    <React.Fragment>
      <Head>
        <title>My page</title>
        <meta name="viewport" content="minimum-scale=1, initial-scale=1, width=device-width" />
      </Head>
      <ThemeProvider theme={theme}>
        {/* CssBaseline kickstart an elegant, consistent, and simple baseline to build upon. */}
        <CssBaseline />
        <Component {...pageProps} />
      </ThemeProvider>
    </React.Fragment>
  );
}

MyApp.propTypes = {
  Component: PropTypes.elementType.isRequired,
  pageProps: PropTypes.object.isRequired,
};

_document.js
import React from 'react';
import Document, { Html, Head, Main, NextScript } from 'next/document';
import { ServerStyleSheets } from '@material-ui/core/styles';
import theme from '../src/theme';

export default class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
          {/* PWA primary color */}
          <meta name="theme-color" content={theme.palette.primary.main} />
          <link
            rel="stylesheet"
            href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap"
          />
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}

// `getInitialProps` belongs to `_document` (instead of `_app`),
// it's compatible with server-side generation (SSG).
MyDocument.getInitialProps = async (ctx) => {

  // Render app and page and get the context of the page with collected side effects.
  const sheets = new ServerStyleSheets();
  const originalRenderPage = ctx.renderPage;

  ctx.renderPage = () =>
    originalRenderPage({
      enhanceApp: (App) => (props) => sheets.collect(<App {...props} />),
    });

  const initialProps = await Document.getInitialProps(ctx);

  return {
    ...initialProps,
    // Styles fragment is rendered after the app and page rendering finish.
    styles: [...React.Children.toArray(initialProps.styles), sheets.getStyleElement()],
  };
};
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