搭建nextjs脚手架遇到的问题及解决

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问题

nextjs是react的ssr后端渲染框架，在搭建过程中遇到一些问题，再次记录下来。

  1. 使用antd ui框架，同时使用scss预处理器，在next.config.js中同时使用with-less和with-sass,并没有达到预期中的结果，scss文件解析正常，antd样式全丢。
  2. 实现antd的按需加载
  3. 使用typescript，如何配置。

解决方法

  1. 在next官网上告诉我们的with-sass,with-less串联的方法并不管用，需要自己新建next.config.js文件，配置loader。但是有个特例，with-typescript，我们把上面修改好的webpack配置传给他就可以开启typescript支持了，所有代码在下面。
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    const path = require('path');
    const withTypescript = require('@zeit/next-typescript');
    const cssLoaderConfig = require('@zeit/next-css/css-loader-config');
    const lessToJS = require('less-vars-to-js');
    const fs = require('fs');
    const themeVariables = lessToJS(
      fs.readFileSync(path.resolve(__dirname, './assets/antd-custom.less'), 'utf8'),
    );

    // fix: prevents error when .less files are required by node
    if (typeof require !== 'undefined') {
      require.extensions['.less'] = (file) => {};
    }

    module.exports = withTypescript({
      pageExtensions: ['jsx', 'js', 'ts', 'tsx'],
      webpack(config, options) {
        if (!options.defaultLoaders) {
          throw new Error(
            'This plugin is not compatible with Next.js versions below 5.0.0 https://err.sh/next-plugins/upgrade',
          );
        }
        const { dev, defaultLoaders, isServer } = options;
        // const nextConfig = {};
        const {
          cssModules,
          cssLoaderOptions,
          postcssLoaderOptions,
          lessLoaderOptions = {},
        } = {};

        console.log('options.defaultLoaders', defaultLoaders);

        config.resolve.extensions.push('.ts', '.tsx');
        config.resolve.alias = Object.assign({}, config.resolve.alias, {
          '@utils': path.resolve(__dirname, 'utils'),
          '@assets': path.resolve(__dirname, 'assets'),
          '@pages': path.resolve(__dirname, 'pages'),
          '@components': path.resolve(__dirname, 'components'),
          '@services': path.resolve(__dirname, 'services'),
        });

        defaultLoaders.less = cssLoaderConfig(config, {
          extensions: ['less'],
          cssModules,
          cssLoaderOptions,
          postcssLoaderOptions,
          dev,
          isServer,
          loaders: [
            {
              loader: 'less-loader',
              options: lessLoaderOptions,
            },
          ],
        });

        config.module.rules.push({
          test: /\.less$/,
          exclude: /node_modules/,
          use: options.defaultLoaders.less,
        });

        // 我们禁用了antd的cssModules
        config.module.rules.push({
          test: /\.less$/,
          include: /node_modules/,
          use: cssLoaderConfig(config, {
            extensions: ['less'],
            cssModules: false,
            cssLoaderOptions: {},
            dev,
            isServer,
            loaders: [
              {
                loader: 'less-loader',
                options: {
                  javascriptEnabled: true,
                  modifyVars: themeVariables,
                },
              },
            ],
          }),
        });

        config.module.rules.push({
          test: /\.scss$/,
          exclude: /node_modules/,
          use: cssLoaderConfig(config, {
            extensions: ['scss'],
            cssModules: true,
            cssLoaderOptions: {
              importLoaders: 1,
              localIdentName: '[local]_[hash:base64:6]',
            },
            dev,
            isServer,
            loaders: [
              {
                loader: 'sass-loader',
                options: {
                  data: '@import "_base.scss";',
                  includePaths: [path.resolve('./styles')],
                },
              },
            ],
          }),
        });
        if (dev) {
          config.module.rules.push({
            test: /\.(ts|tsx|js|jsx)$/,
            enforce: 'pre',
            exclude: /node_modules/,
            options: {
              configFile: path.resolve('.eslintrc'),
              eslint: {
                configFile: path.resolve(__dirname, '.eslintrc'),
              },
              fix: true,
            },
            loader: 'eslint-loader',
          });
          config.devtool = 'cheap-module-eval-source-map';
        }

        return config;
      },
    });
    这样less和scss,ts就可以同时使用了.
  2. 常规操作
1
yarn add  babel-plugin-impor

修改babelrc (add .babelrc file in your project)

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{
    "presets": [
        "next/babel"
    ],
    "plugins": [
        [
            "import",
            {
                "libraryName": "antd",
                "libraryDirectory":"lib",
                "style": true
            }
        ]
    ]
}
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