详解在create-react-app使用less与antd按需加载

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使用antd按需加载

使用react-app-rewired对 create-react-app 的默认配置进行自定义

1、yarn add react-app-rewired --dev

/* package.json */
"scripts": {
-  "start": "react-scripts start",
+  "start": "react-app-rewired start",
-  "build": "react-scripts build",
+  "build": "react-app-rewired build",
-  "test": "react-scripts test --env=jsdom",
+  "test": "react-app-rewired test --env=jsdom",
}

2.然后在项目根目录创建一个 config-overrides.js 用于修改默认配置。

module.exports = function override(config, env) {
 // do stuff with the webpack config...
 return config;
};

使用 babel-plugin-import

babel-plugin-import 是一个用于按需加载组件代码和样式babel 插件（原理），现在我们尝试安装它并修改config-overrides.js 文件

1.yarn add babel-plugin-import --dev

+ const { injectBabelPlugin } = require('react-app-rewired');

 module.exports = function override(config, env) {
+  config = injectBabelPlugin(['import', { libraryName: 'antd', libraryDirectory: 'es', style: 'css' }], config);
  return config;
 };

或者也可修改

{
      test: /\.(js|jsx|mjs)$/,
      include: paths.appSrc,
      loader: require.resolve('babel-loader'),
      options: {
       plugins: [
        ['import', { libraryName: 'antd', style: true }],
       ],
       // This is a feature of `babel-loader` for webpack (not Babel itself).
       // It enables caching results in ./node_modules/.cache/babel-loader/
       // directory for faster rebuilds.
       cacheDirectory: true,
      },
     },

自定义主题

yarn add react-app-rewire-less --dev

 const { injectBabelPlugin } = require('react-app-rewired');
+ const rewireLess = require('react-app-rewire-less');

 module.exports = function override(config, env) {
-  config = injectBabelPlugin(['import', { libraryName: 'antd', style: 'css' }], config);
+  config = injectBabelPlugin(['import', { libraryName: 'antd', style: true }], config);
+  config = rewireLess.withLoaderOptions({
+   modifyVars: { "@primary-color": "#1DA57A" },
+  })(config, env);
  return config;
 };

参考链接：https://ant.design/docs/react/use-with-create-react-app-cn

使用less

如果已经配置react-app-rewire-less，则无需再进行此操作

1.npm install less-loader less --save-dev
2.修改node_modules/react_script/config下的webpack.config.dev.js 和 webpack.config-prod.js 配置文件

test: /.css$/ 改为 /.(css|less)$/
test: /.css$/ 的 use 数组配置增加 less-loader

{
 test: /\.(css|less)$/,
 use: [
  require.resolve('style-loader'),
  {
   loader: require.resolve('css-loader'),
   options: {
    importLoaders: 1,
   },
  },
  {
   loader: require.resolve('postcss-loader'),
   options: {
    // Necessary for external CSS imports to work
    // https://github.com/facebookincubator/create-react-app/issues/2677
    ident: 'postcss',
    plugins: () => [
     require('postcss-flexbugs-fixes'),
     autoprefixer({
      browsers: [
       '>1%',
       'last 4 versions',
       'Firefox ESR',
       'not ie < 9', // React doesn't support IE8 anyway
      ],
      flexbox: 'no-2009',
     }),
    ],
   },
  },
  {
   loader: require.resolve('less-loader') // compiles Less to CSS
  }
 ],
},

使用css Module

antd 和 css modules 不能混用,针对antd的css 单独写一条loader的规则,不开启 css modules。

使用 exclude 和 include 配置,修改webpack.config.dev.js 和 webpack.config-prod.js 配置文件 (尽量不要使用less-loader 来处理css文件，在与antd一起使用时可能出现错误，单独写一条规则)

    {
      test: /\.css$/,
      exclude: /node_modules|antd\.css/,
      use: [
       require.resolve('style-loader'),
       {
        loader: require.resolve('css-loader'),
        options: {
         importLoaders: 1,
         modules: true,  // 新增对css modules的支持
         localIdentName: '[name]__[local]__[hash:base64:5]',
        },
       },
       {
        loader: require.resolve('postcss-loader'),
        options: {
         // Necessary for external CSS imports to work
         // https://github.com/facebookincubator/create-react-app/issues/2677
         ident: 'postcss',
         plugins: () => [
          require('postcss-flexbugs-fixes'),
          autoprefixer({
           browsers: [
            '>1%',
            'last 4 versions',
            'Firefox ESR',
            'not ie < 9', // React doesn't support IE8 anyway
           ],
           flexbox: 'no-2009',
          }),
         ],
        },
       },
      ],
     },
     {
      test: /\.less$/,
      exclude: /node_modules|antd\.less/,
      use: [
       require.resolve('style-loader'),
       {
        loader: require.resolve('css-loader'),
        options: {
         importLoaders: 1,
         modules: true,  // 新增对css modules的支持
         localIdentName: '[name]__[local]__[hash:base64:5]',
        },
       },
       {
        loader: require.resolve('postcss-loader'),
        options: {
         // Necessary for external CSS imports to work
         // https://github.com/facebookincubator/create-react-app/issues/2677
         ident: 'postcss',
         plugins: () => [
          require('postcss-flexbugs-fixes'),
          autoprefixer({
           browsers: [
            '>1%',
            'last 4 versions',
            'Firefox ESR',
            'not ie < 9', // React doesn't support IE8 anyway
           ],
           flexbox: 'no-2009',
          }),
         ],
        },
       },
       {
        loader: require.resolve('less-loader') // compiles Less to CSS
       },
      ],
     },
     {
      test: /\.(css)$/,
      include: /node_modules|antd\.css/,
      use: [
       require.resolve('style-loader'),
       {
        loader: require.resolve('css-loader'),
        options: {
         importLoaders: 1,
        },
       },
       {
        loader: require.resolve('postcss-loader'),
        options: {
         // Necessary for external CSS imports to work
         // https://github.com/facebookincubator/create-react-app/issues/2677
         ident: 'postcss',
         plugins: () => [
          require('postcss-flexbugs-fixes'),
          autoprefixer({
           browsers: [
            '>1%',
            'last 4 versions',
            'Firefox ESR',
            'not ie < 9', // React doesn't support IE8 anyway
           ],
           flexbox: 'no-2009',
          }),
         ],
        },
       },
      ],
     },
     {
      test: /\.(less)$/,
      include: /node_modules|antd\.less/,
      use: [
       require.resolve('style-loader'),
       {
        loader: require.resolve('css-loader'),
        options: {
         importLoaders: 1,
        },
       },
       {
        loader: require.resolve('postcss-loader'),
        options: {
         // Necessary for external CSS imports to work
         // https://github.com/facebookincubator/create-react-app/issues/2677
         ident: 'postcss',
         plugins: () => [
          require('postcss-flexbugs-fixes'),
          autoprefixer({
           browsers: [
            '>1%',
            'last 4 versions',
            'Firefox ESR',
            'not ie < 9', // React doesn't support IE8 anyway
           ],
           flexbox: 'no-2009',
          }),
         ],
        },
       },
       {
        loader: require.resolve('less-loader') // compiles Less to CSS
       },
      ],
     },

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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