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create-react-app中antd按需加载配置+自定义主

create-react-app中antd按需加载配置+自定义主

作者: Melody_28a2 | 来源:发表于2021-01-09 15:14 被阅读0次

    另一种按需加载,没试过,可以试试

    image.png

    配置步骤:

    安装依赖

    # npm  安装antd
    npm install antd --save
    
    # npm  安装less, less-loader
    npm install less less-loader --save
    
    # npm  安装babel-plugin-import
    npm install babel-plugin-import --save-dev
    
    

    使用 create-react-app 创建的 react , 在项目目录中是看不到关于 webpack 的配置项的. 可以通过 create-react-app为我们提供的npm run eject暴露配置文件

    # npm
    npm run eject
    
    

    运行命令后,项目中多了两个文件夹 config 和 scripts. package.json 也是大变样. 我们主要关注 config 文件中的 webpack.config.js

    image.png

    更改配置项

    // webpack.config.js
    
    ...
    // style files regexes
    const cssRegex = /\.css$/;
    const cssModuleRegex = /\.module\.css$/;
    const sassRegex = /\.(scss|sass)$/;
    const sassModuleRegex = /\.module\.(scss|sass)$/;
    
    // 此处添加: 自定义添加less配置
    const lessRegex = /\.less$/;
    const lessModuleRegex = /\.module\.less$/;
    // 添加结束
    ...
    

    在 file-loader 上面引入规则 顺序不可变更. 当配置多个 loader 时, loader 的执行顺序是从右到左, 从下到上

    ...
    {
      test: sassModuleRegex,
      use: getStyleLoaders(
        {
          importLoaders: 3,
          sourceMap: isEnvProduction && shouldUseSourceMap,
          modules: {
            getLocalIdent: getCSSModuleLocalIdent,
          },
        },
        'sass-loader'
      ),
    },
    
    // 此处添加: 自定义添加 less
    {
      test: lessRegex,
      exclude: lessModuleRegex,
      use: getStyleLoaders(
        {
          importLoaders: 3,
          sourceMap: isEnvProduction && shouldUseSourceMap,
        },
        'less-loader'
      ),
      sideEffects: true,
    },
    {
      test: lessModuleRegex,
      use: getStyleLoaders(
        {
          importLoaders: 3,
          sourceMap: isEnvProduction && shouldUseSourceMap,
          modules: {
            getLocalIdent: getCSSModuleLocalIdent,
          },
        },
        'less-loader'
      ),
    },
    // 添加结束!
    
    {
      loader: require.resolve('file-loader'),
      // Exclude `js` files to keep "css" loader working as it injects
      // its runtime that would otherwise be processed through "file" loader.
      // Also exclude `html` and `json` extensions so they get processed
      // by webpacks internal loaders.
      exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
      options: {
        name: 'static/media/[name].[hash:8].[ext]',
      },
    },
    // ** STOP ** Are you adding a new loader?
    ...
    

    按需加载配置

    ...
    plugins: [
      [
        require.resolve('babel-plugin-named-asset-import'),
        {
          loaderMap: {
            svg: {
              ReactComponent:
                '@svgr/webpack?-svgo,+titleProp,+ref![path]',
            },
          },
        },
      ],
      // 此处添加: 按需引入 antd
      [
        require.resolve('babel-plugin-import'),
        {
          libraryName: 'antd',
          "libraryDirectory": "es",
          style: true
        }
      ]
      // 添加结束
    ],
    ...
    

    自定义主题配置

    ...
    if (preProcessor) {
      loaders.push(
        {
          loader: require.resolve('resolve-url-loader'),
          options: {
            sourceMap: isEnvProduction && shouldUseSourceMap,
          },
        },
        {
          loader: require.resolve(preProcessor),
          options: {
            sourceMap: true,
          },
        }
      );
    }
    // 此处添加: 自定义主题
    if (preProcessor && preProcessor === 'less-loader') {
      loaders.push(
        {
          loader: require.resolve('resolve-url-loader'),
          options: {
            sourceMap: isEnvProduction && shouldUseSourceMap
          }
        },
        {
          loader: require.resolve(preProcessor),
          options: {
            sourceMap: true,
            javascriptEnabled: true,
            modifyVars: {
              'primary-color': '#ff4757',
              'link-color': '#ff4757',
              'border-radius-base': '2px',
            }
          }
        }
      );
    }
    // 添加结束
    return loaders;
    ...
    

    到此,完成了按需加载和自定义主题的配置,大功告成~~~

    image.png

    webpack.config.js完整代码

    "use strict";
    
    const fs = require("fs");
    const path = require("path");
    const webpack = require("webpack");
    const resolve = require("resolve");
    const PnpWebpackPlugin = require("pnp-webpack-plugin");
    const HtmlWebpackPlugin = require("html-webpack-plugin");
    const CaseSensitivePathsPlugin = require("case-sensitive-paths-webpack-plugin");
    const InlineChunkHtmlPlugin = require("react-dev-utils/InlineChunkHtmlPlugin");
    const TerserPlugin = require("terser-webpack-plugin");
    const MiniCssExtractPlugin = require("mini-css-extract-plugin");
    const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
    const safePostCssParser = require("postcss-safe-parser");
    const ManifestPlugin = require("webpack-manifest-plugin");
    const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
    const WorkboxWebpackPlugin = require("workbox-webpack-plugin");
    const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
    const ModuleScopePlugin = require("react-dev-utils/ModuleScopePlugin");
    const getCSSModuleLocalIdent = require("react-dev-utils/getCSSModuleLocalIdent");
    const ESLintPlugin = require("eslint-webpack-plugin");
    const paths = require("./paths");
    const modules = require("./modules");
    const getClientEnvironment = require("./env");
    const ModuleNotFoundPlugin = require("react-dev-utils/ModuleNotFoundPlugin");
    const ForkTsCheckerWebpackPlugin = require("react-dev-utils/ForkTsCheckerWebpackPlugin");
    const typescriptFormatter = require("react-dev-utils/typescriptFormatter");
    const ReactRefreshWebpackPlugin = require("@pmmmwh/react-refresh-webpack-plugin");
    
    const postcssNormalize = require("postcss-normalize");
    
    const appPackageJson = require(paths.appPackageJson);
    
    // Source maps are resource heavy and can cause out of memory issue for large source files.
    const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== "false";
    
    const webpackDevClientEntry = require.resolve(
      "react-dev-utils/webpackHotDevClient"
    );
    const reactRefreshOverlayEntry = require.resolve(
      "react-dev-utils/refreshOverlayInterop"
    );
    
    // Some apps do not need the benefits of saving a web request, so not inlining the chunk
    // makes for a smoother build process.
    const shouldInlineRuntimeChunk = process.env.INLINE_RUNTIME_CHUNK !== "false";
    
    const imageInlineSizeLimit = parseInt(
      process.env.IMAGE_INLINE_SIZE_LIMIT || "10000"
    );
    
    // Check if TypeScript is setup
    const useTypeScript = fs.existsSync(paths.appTsConfig);
    
    // Get the path to the uncompiled service worker (if it exists).
    const swSrc = paths.swSrc;
    
    // style files regexes
    const cssRegex = /\.css$/;
    const cssModuleRegex = /\.module\.css$/;
    const sassRegex = /\.(scss|sass)$/;
    const sassModuleRegex = /\.module\.(scss|sass)$/;
    
    // 此处添加: 自定义添加less配置
    const lessRegex = /\.less$/;
    const lessModuleRegex = /\.module\.less$/;
    // 添加结束
    
    const hasJsxRuntime = (() => {
      if (process.env.DISABLE_NEW_JSX_TRANSFORM === "true") {
        return false;
      }
    
      try {
        require.resolve("react/jsx-runtime");
        return true;
      } catch (e) {
        return false;
      }
    })();
    
    // This is the production and development configuration.
    // It is focused on developer experience, fast rebuilds, and a minimal bundle.
    module.exports = function (webpackEnv) {
      const isEnvDevelopment = webpackEnv === "development";
      const isEnvProduction = webpackEnv === "production";
    
      // Variable used for enabling profiling in Production
      // passed into alias object. Uses a flag if passed into the build command
      const isEnvProductionProfile =
        isEnvProduction && process.argv.includes("--profile");
    
      // We will provide `paths.publicUrlOrPath` to our app
      // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
      // Omit trailing slash as %PUBLIC_URL%/xyz looks better than %PUBLIC_URL%xyz.
      // Get environment variables to inject into our app.
      const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1));
    
      const shouldUseReactRefresh = env.raw.FAST_REFRESH;
    
      // common function to get style loaders
      const getStyleLoaders = (cssOptions, preProcessor) => {
        const loaders = [
          isEnvDevelopment && require.resolve("style-loader"),
          isEnvProduction && {
            loader: MiniCssExtractPlugin.loader,
            // css is located in `static/css`, use '../../' to locate index.html folder
            // in production `paths.publicUrlOrPath` can be a relative path
            options: paths.publicUrlOrPath.startsWith(".")
              ? { publicPath: "../../" }
              : {},
          },
          {
            loader: require.resolve("css-loader"),
            options: cssOptions,
          },
          {
            // Options for PostCSS as we reference these options twice
            // Adds vendor prefixing based on your specified browser support in
            // package.json
            loader: require.resolve("postcss-loader"),
            options: {
              // Necessary for external CSS imports to work
              // https://github.com/facebook/create-react-app/issues/2677
              ident: "postcss",
              plugins: () => [
                require("postcss-flexbugs-fixes"),
                require("postcss-preset-env")({
                  autoprefixer: {
                    flexbox: "no-2009",
                  },
                  stage: 3,
                }),
                // Adds PostCSS Normalize as the reset css with default options,
                // so that it honors browserslist config in package.json
                // which in turn let's users customize the target behavior as per their needs.
                postcssNormalize(),
              ],
              sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
            },
          },
        ].filter(Boolean);
        if (preProcessor) {
          loaders.push(
            {
              loader: require.resolve("resolve-url-loader"),
              options: {
                sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
                root: paths.appSrc,
              },
            },
            {
              loader: require.resolve(preProcessor),
              options: {
                sourceMap: true,
              },
            }
          );
        }
        // 此处添加: 自定义主题
        if (preProcessor && preProcessor === "less-loader") {
          loaders.push(
            {
              loader: require.resolve("resolve-url-loader"),
              options: {
                sourceMap: isEnvProduction && shouldUseSourceMap,
              },
            },
            {
              loader: require.resolve(preProcessor),
              options: {
                sourceMap: true,
                javascriptEnabled: true,
                modifyVars: {
                  "primary-color": "#ff4757",
                  "link-color": "#ff4757",
                  "border-radius-base": "2px",
                },
              },
            }
          );
        }
        return loaders;
      };
    
      return {
        mode: isEnvProduction ? "production" : isEnvDevelopment && "development",
        // Stop compilation early in production
        bail: isEnvProduction,
        devtool: isEnvProduction
          ? shouldUseSourceMap
            ? "source-map"
            : false
          : isEnvDevelopment && "cheap-module-source-map",
        // These are the "entry points" to our application.
        // This means they will be the "root" imports that are included in JS bundle.
        entry:
          isEnvDevelopment && !shouldUseReactRefresh
            ? [
                // Include an alternative client for WebpackDevServer. A client's job is to
                // connect to WebpackDevServer by a socket and get notified about changes.
                // When you save a file, the client will either apply hot updates (in case
                // of CSS changes), or refresh the page (in case of JS changes). When you
                // make a syntax error, this client will display a syntax error overlay.
                // Note: instead of the default WebpackDevServer client, we use a custom one
                // to bring better experience for Create React App users. You can replace
                // the line below with these two lines if you prefer the stock client:
                //
                // require.resolve('webpack-dev-server/client') + '?/',
                // require.resolve('webpack/hot/dev-server'),
                //
                // When using the experimental react-refresh integration,
                // the webpack plugin takes care of injecting the dev client for us.
                webpackDevClientEntry,
                // Finally, this is your app's code:
                paths.appIndexJs,
                // We include the app code last so that if there is a runtime error during
                // initialization, it doesn't blow up the WebpackDevServer client, and
                // changing JS code would still trigger a refresh.
              ]
            : paths.appIndexJs,
        output: {
          // The build folder.
          path: isEnvProduction ? paths.appBuild : undefined,
          // Add /* filename */ comments to generated require()s in the output.
          pathinfo: isEnvDevelopment,
          // There will be one main bundle, and one file per asynchronous chunk.
          // In development, it does not produce real files.
          filename: isEnvProduction
            ? "static/js/[name].[contenthash:8].js"
            : isEnvDevelopment && "static/js/bundle.js",
          // TODO: remove this when upgrading to webpack 5
          futureEmitAssets: true,
          // There are also additional JS chunk files if you use code splitting.
          chunkFilename: isEnvProduction
            ? "static/js/[name].[contenthash:8].chunk.js"
            : isEnvDevelopment && "static/js/[name].chunk.js",
          // webpack uses `publicPath` to determine where the app is being served from.
          // It requires a trailing slash, or the file assets will get an incorrect path.
          // We inferred the "public path" (such as / or /my-project) from homepage.
          publicPath: paths.publicUrlOrPath,
          // Point sourcemap entries to original disk location (format as URL on Windows)
          devtoolModuleFilenameTemplate: isEnvProduction
            ? (info) =>
                path
                  .relative(paths.appSrc, info.absoluteResourcePath)
                  .replace(/\\/g, "/")
            : isEnvDevelopment &&
              ((info) =>
                path.resolve(info.absoluteResourcePath).replace(/\\/g, "/")),
          // Prevents conflicts when multiple webpack runtimes (from different apps)
          // are used on the same page.
          jsonpFunction: `webpackJsonp${appPackageJson.name}`,
          // this defaults to 'window', but by setting it to 'this' then
          // module chunks which are built will work in web workers as well.
          globalObject: "this",
        },
        optimization: {
          minimize: isEnvProduction,
          minimizer: [
            // This is only used in production mode
            new TerserPlugin({
              terserOptions: {
                parse: {
                  // We want terser to parse ecma 8 code. However, we don't want it
                  // to apply any minification steps that turns valid ecma 5 code
                  // into invalid ecma 5 code. This is why the 'compress' and 'output'
                  // sections only apply transformations that are ecma 5 safe
                  // https://github.com/facebook/create-react-app/pull/4234
                  ecma: 8,
                },
                compress: {
                  ecma: 5,
                  warnings: false,
                  // Disabled because of an issue with Uglify breaking seemingly valid code:
                  // https://github.com/facebook/create-react-app/issues/2376
                  // Pending further investigation:
                  // https://github.com/mishoo/UglifyJS2/issues/2011
                  comparisons: false,
                  // Disabled because of an issue with Terser breaking valid code:
                  // https://github.com/facebook/create-react-app/issues/5250
                  // Pending further investigation:
                  // https://github.com/terser-js/terser/issues/120
                  inline: 2,
                },
                mangle: {
                  safari10: true,
                },
                // Added for profiling in devtools
                keep_classnames: isEnvProductionProfile,
                keep_fnames: isEnvProductionProfile,
                output: {
                  ecma: 5,
                  comments: false,
                  // Turned on because emoji and regex is not minified properly using default
                  // https://github.com/facebook/create-react-app/issues/2488
                  ascii_only: true,
                },
              },
              sourceMap: shouldUseSourceMap,
            }),
            // This is only used in production mode
            new OptimizeCSSAssetsPlugin({
              cssProcessorOptions: {
                parser: safePostCssParser,
                map: shouldUseSourceMap
                  ? {
                      // `inline: false` forces the sourcemap to be output into a
                      // separate file
                      inline: false,
                      // `annotation: true` appends the sourceMappingURL to the end of
                      // the css file, helping the browser find the sourcemap
                      annotation: true,
                    }
                  : false,
              },
              cssProcessorPluginOptions: {
                preset: ["default", { minifyFontValues: { removeQuotes: false } }],
              },
            }),
          ],
          // Automatically split vendor and commons
          // https://twitter.com/wSokra/status/969633336732905474
          // https://medium.com/webpack/webpack-4-code-splitting-chunk-graph-and-the-splitchunks-optimization-be739a861366
          splitChunks: {
            chunks: "all",
            name: false,
          },
          // Keep the runtime chunk separated to enable long term caching
          // https://twitter.com/wSokra/status/969679223278505985
          // https://github.com/facebook/create-react-app/issues/5358
          runtimeChunk: {
            name: (entrypoint) => `runtime-${entrypoint.name}`,
          },
        },
        resolve: {
          // This allows you to set a fallback for where webpack should look for modules.
          // We placed these paths second because we want `node_modules` to "win"
          // if there are any conflicts. This matches Node resolution mechanism.
          // https://github.com/facebook/create-react-app/issues/253
          modules: ["node_modules", paths.appNodeModules].concat(
            modules.additionalModulePaths || []
          ),
          // These are the reasonable defaults supported by the Node ecosystem.
          // We also include JSX as a common component filename extension to support
          // some tools, although we do not recommend using it, see:
          // https://github.com/facebook/create-react-app/issues/290
          // `web` extension prefixes have been added for better support
          // for React Native Web.
          extensions: paths.moduleFileExtensions
            .map((ext) => `.${ext}`)
            .filter((ext) => useTypeScript || !ext.includes("ts")),
          alias: {
            // Support React Native Web
            // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
            "react-native": "react-native-web",
            // Allows for better profiling with ReactDevTools
            ...(isEnvProductionProfile && {
              "react-dom$": "react-dom/profiling",
              "scheduler/tracing": "scheduler/tracing-profiling",
            }),
            ...(modules.webpackAliases || {}),
          },
          plugins: [
            // Adds support for installing with Plug'n'Play, leading to faster installs and adding
            // guards against forgotten dependencies and such.
            PnpWebpackPlugin,
            // Prevents users from importing files from outside of src/ (or node_modules/).
            // This often causes confusion because we only process files within src/ with babel.
            // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
            // please link the files into your node_modules/ and let module-resolution kick in.
            // Make sure your source files are compiled, as they will not be processed in any way.
            new ModuleScopePlugin(paths.appSrc, [
              paths.appPackageJson,
              reactRefreshOverlayEntry,
            ]),
          ],
        },
        resolveLoader: {
          plugins: [
            // Also related to Plug'n'Play, but this time it tells webpack to load its loaders
            // from the current package.
            PnpWebpackPlugin.moduleLoader(module),
          ],
        },
        module: {
          strictExportPresence: true,
          rules: [
            // Disable require.ensure as it's not a standard language feature.
            { parser: { requireEnsure: false } },
            {
              // "oneOf" will traverse all following loaders until one will
              // match the requirements. When no loader matches it will fall
              // back to the "file" loader at the end of the loader list.
              oneOf: [
                // TODO: Merge this config once `image/avif` is in the mime-db
                // https://github.com/jshttp/mime-db
                {
                  test: [/\.avif$/],
                  loader: require.resolve("url-loader"),
                  options: {
                    limit: imageInlineSizeLimit,
                    mimetype: "image/avif",
                    name: "static/media/[name].[hash:8].[ext]",
                  },
                },
                // "url" loader works like "file" loader except that it embeds assets
                // smaller than specified limit in bytes as data URLs to avoid requests.
                // A missing `test` is equivalent to a match.
                {
                  test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
                  loader: require.resolve("url-loader"),
                  options: {
                    limit: imageInlineSizeLimit,
                    name: "static/media/[name].[hash:8].[ext]",
                  },
                },
                // Process application JS with Babel.
                // The preset includes JSX, Flow, TypeScript, and some ESnext features.
                {
                  test: /\.(js|mjs|jsx|ts|tsx)$/,
                  include: paths.appSrc,
                  loader: require.resolve("babel-loader"),
                  options: {
                    customize: require.resolve(
                      "babel-preset-react-app/webpack-overrides"
                    ),
                    presets: [
                      [
                        require.resolve("babel-preset-react-app"),
                        {
                          runtime: hasJsxRuntime ? "automatic" : "classic",
                        },
                      ],
                    ],
    
                    plugins: [
                      [
                        require.resolve("babel-plugin-named-asset-import"),
                        {
                          loaderMap: {
                            svg: {
                              ReactComponent:
                                "@svgr/webpack?-svgo,+titleProp,+ref![path]",
                            },
                          },
                        },
                      ],
                      // 此处添加: 按需引入 antd
                      [
                        require.resolve("babel-plugin-import"),
                        {
                          libraryName: "antd",
                          libraryDirectory: "es",
                          style: true,
                        },
                      ],
                      // 添加结束
                      isEnvDevelopment &&
                        shouldUseReactRefresh &&
                        require.resolve("react-refresh/babel"),
                    ].filter(Boolean),
                    // 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,
                    // See #6846 for context on why cacheCompression is disabled
                    cacheCompression: false,
                    compact: isEnvProduction,
                  },
                },
                // Process any JS outside of the app with Babel.
                // Unlike the application JS, we only compile the standard ES features.
                {
                  test: /\.(js|mjs)$/,
                  exclude: /@babel(?:\/|\\{1,2})runtime/,
                  loader: require.resolve("babel-loader"),
                  options: {
                    babelrc: false,
                    configFile: false,
                    compact: false,
                    presets: [
                      [
                        require.resolve("babel-preset-react-app/dependencies"),
                        { helpers: true },
                      ],
                    ],
                    cacheDirectory: true,
                    // See #6846 for context on why cacheCompression is disabled
                    cacheCompression: false,
    
                    // Babel sourcemaps are needed for debugging into node_modules
                    // code.  Without the options below, debuggers like VSCode
                    // show incorrect code and set breakpoints on the wrong lines.
                    sourceMaps: shouldUseSourceMap,
                    inputSourceMap: shouldUseSourceMap,
                  },
                },
                // "postcss" loader applies autoprefixer to our CSS.
                // "css" loader resolves paths in CSS and adds assets as dependencies.
                // "style" loader turns CSS into JS modules that inject <style> tags.
                // In production, we use MiniCSSExtractPlugin to extract that CSS
                // to a file, but in development "style" loader enables hot editing
                // of CSS.
                // By default we support CSS Modules with the extension .module.css
                {
                  test: cssRegex,
                  exclude: cssModuleRegex,
                  use: getStyleLoaders({
                    importLoaders: 1,
                    sourceMap: isEnvProduction
                      ? shouldUseSourceMap
                      : isEnvDevelopment,
                  }),
                  // Don't consider CSS imports dead code even if the
                  // containing package claims to have no side effects.
                  // Remove this when webpack adds a warning or an error for this.
                  // See https://github.com/webpack/webpack/issues/6571
                  sideEffects: true,
                },
                // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
                // using the extension .module.css
                {
                  test: cssModuleRegex,
                  use: getStyleLoaders({
                    importLoaders: 1,
                    sourceMap: isEnvProduction
                      ? shouldUseSourceMap
                      : isEnvDevelopment,
                    modules: {
                      getLocalIdent: getCSSModuleLocalIdent,
                    },
                  }),
                },
                // Opt-in support for SASS (using .scss or .sass extensions).
                // By default we support SASS Modules with the
                // extensions .module.scss or .module.sass
                {
                  test: sassRegex,
                  exclude: sassModuleRegex,
                  use: getStyleLoaders(
                    {
                      importLoaders: 3,
                      sourceMap: isEnvProduction
                        ? shouldUseSourceMap
                        : isEnvDevelopment,
                    },
                    "sass-loader"
                  ),
                  // Don't consider CSS imports dead code even if the
                  // containing package claims to have no side effects.
                  // Remove this when webpack adds a warning or an error for this.
                  // See https://github.com/webpack/webpack/issues/6571
                  sideEffects: true,
                },
                // Adds support for CSS Modules, but using SASS
                // using the extension .module.scss or .module.sass
                {
                  test: sassModuleRegex,
                  use: getStyleLoaders(
                    {
                      importLoaders: 3,
                      sourceMap: isEnvProduction
                        ? shouldUseSourceMap
                        : isEnvDevelopment,
                      modules: {
                        getLocalIdent: getCSSModuleLocalIdent,
                      },
                    },
                    "sass-loader"
                  ),
                },
                // 此处添加: 自定义添加 less
                {
                  test: lessRegex,
                  exclude: lessModuleRegex,
                  use: getStyleLoaders(
                    {
                      importLoaders: 3,
                      sourceMap: isEnvProduction && shouldUseSourceMap,
                    },
                    "less-loader"
                  ),
                  sideEffects: true,
                },
                {
                  test: lessModuleRegex,
                  use: getStyleLoaders(
                    {
                      importLoaders: 3,
                      sourceMap: isEnvProduction && shouldUseSourceMap,
                      modules: {
                        getLocalIdent: getCSSModuleLocalIdent,
                      },
                    },
                    "less-loader"
                  ),
                },
                // 添加结束!
                // "file" loader makes sure those assets get served by WebpackDevServer.
                // When you `import` an asset, you get its (virtual) filename.
                // In production, they would get copied to the `build` folder.
                // This loader doesn't use a "test" so it will catch all modules
                // that fall through the other loaders.
                {
                  loader: require.resolve("file-loader"),
                  // Exclude `js` files to keep "css" loader working as it injects
                  // its runtime that would otherwise be processed through "file" loader.
                  // Also exclude `html` and `json` extensions so they get processed
                  // by webpacks internal loaders.
                  exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
                  options: {
                    name: "static/media/[name].[hash:8].[ext]",
                  },
                },
                // ** STOP ** Are you adding a new loader?
                // Make sure to add the new loader(s) before the "file" loader.
              ],
            },
          ],
        },
        plugins: [
          // Generates an `index.html` file with the <script> injected.
          new HtmlWebpackPlugin(
            Object.assign(
              {},
              {
                inject: true,
                template: paths.appHtml,
              },
              isEnvProduction
                ? {
                    minify: {
                      removeComments: true,
                      collapseWhitespace: true,
                      removeRedundantAttributes: true,
                      useShortDoctype: true,
                      removeEmptyAttributes: true,
                      removeStyleLinkTypeAttributes: true,
                      keepClosingSlash: true,
                      minifyJS: true,
                      minifyCSS: true,
                      minifyURLs: true,
                    },
                  }
                : undefined
            )
          ),
          // Inlines the webpack runtime script. This script is too small to warrant
          // a network request.
          // https://github.com/facebook/create-react-app/issues/5358
          isEnvProduction &&
            shouldInlineRuntimeChunk &&
            new InlineChunkHtmlPlugin(HtmlWebpackPlugin, [/runtime-.+[.]js/]),
          // Makes some environment variables available in index.html.
          // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
          // <link rel="icon" href="%PUBLIC_URL%/favicon.ico">
          // It will be an empty string unless you specify "homepage"
          // in `package.json`, in which case it will be the pathname of that URL.
          new InterpolateHtmlPlugin(HtmlWebpackPlugin, env.raw),
          // This gives some necessary context to module not found errors, such as
          // the requesting resource.
          new ModuleNotFoundPlugin(paths.appPath),
          // Makes some environment variables available to the JS code, for example:
          // if (process.env.NODE_ENV === 'production') { ... }. See `./env.js`.
          // It is absolutely essential that NODE_ENV is set to production
          // during a production build.
          // Otherwise React will be compiled in the very slow development mode.
          new webpack.DefinePlugin(env.stringified),
          // This is necessary to emit hot updates (CSS and Fast Refresh):
          isEnvDevelopment && new webpack.HotModuleReplacementPlugin(),
          // Experimental hot reloading for React .
          // https://github.com/facebook/react/tree/master/packages/react-refresh
          isEnvDevelopment &&
            shouldUseReactRefresh &&
            new ReactRefreshWebpackPlugin({
              overlay: {
                entry: webpackDevClientEntry,
                // The expected exports are slightly different from what the overlay exports,
                // so an interop is included here to enable feedback on module-level errors.
                module: reactRefreshOverlayEntry,
                // Since we ship a custom dev client and overlay integration,
                // the bundled socket handling logic can be eliminated.
                sockIntegration: false,
              },
            }),
          // Watcher doesn't work well if you mistype casing in a path so we use
          // a plugin that prints an error when you attempt to do this.
          // See https://github.com/facebook/create-react-app/issues/240
          isEnvDevelopment && new CaseSensitivePathsPlugin(),
          // If you require a missing module and then `npm install` it, you still have
          // to restart the development server for webpack to discover it. This plugin
          // makes the discovery automatic so you don't have to restart.
          // See https://github.com/facebook/create-react-app/issues/186
          isEnvDevelopment &&
            new WatchMissingNodeModulesPlugin(paths.appNodeModules),
          isEnvProduction &&
            new MiniCssExtractPlugin({
              // Options similar to the same options in webpackOptions.output
              // both options are optional
              filename: "static/css/[name].[contenthash:8].css",
              chunkFilename: "static/css/[name].[contenthash:8].chunk.css",
            }),
          // Generate an asset manifest file with the following content:
          // - "files" key: Mapping of all asset filenames to their corresponding
          //   output file so that tools can pick it up without having to parse
          //   `index.html`
          // - "entrypoints" key: Array of files which are included in `index.html`,
          //   can be used to reconstruct the HTML if necessary
          new ManifestPlugin({
            fileName: "asset-manifest.json",
            publicPath: paths.publicUrlOrPath,
            generate: (seed, files, entrypoints) => {
              const manifestFiles = files.reduce((manifest, file) => {
                manifest[file.name] = file.path;
                return manifest;
              }, seed);
              const entrypointFiles = entrypoints.main.filter(
                (fileName) => !fileName.endsWith(".map")
              );
    
              return {
                files: manifestFiles,
                entrypoints: entrypointFiles,
              };
            },
          }),
          // Moment.js is an extremely popular library that bundles large locale files
          // by default due to how webpack interprets its code. This is a practical
          // solution that requires the user to opt into importing specific locales.
          // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
          // You can remove this if you don't use Moment.js:
          new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
          // Generate a service worker script that will precache, and keep up to date,
          // the HTML & assets that are part of the webpack build.
          isEnvProduction &&
            fs.existsSync(swSrc) &&
            new WorkboxWebpackPlugin.InjectManifest({
              swSrc,
              dontCacheBustURLsMatching: /\.[0-9a-f]{8}\./,
              exclude: [/\.map$/, /asset-manifest\.json$/, /LICENSE/],
              // Bump up the default maximum size (2mb) that's precached,
              // to make lazy-loading failure scenarios less likely.
              // See https://github.com/cra-template/pwa/issues/13#issuecomment-722667270
              maximumFileSizeToCacheInBytes: 5 * 1024 * 1024,
            }),
          // TypeScript type checking
          useTypeScript &&
            new ForkTsCheckerWebpackPlugin({
              typescript: resolve.sync("typescript", {
                basedir: paths.appNodeModules,
              }),
              async: isEnvDevelopment,
              checkSyntacticErrors: true,
              resolveModuleNameModule: process.versions.pnp
                ? `${__dirname}/pnpTs.js`
                : undefined,
              resolveTypeReferenceDirectiveModule: process.versions.pnp
                ? `${__dirname}/pnpTs.js`
                : undefined,
              tsconfig: paths.appTsConfig,
              reportFiles: [
                // This one is specifically to match during CI tests,
                // as micromatch doesn't match
                // '../cra-template-typescript/template/src/App.tsx'
                // otherwise.
                "../**/src/**/*.{ts,tsx}",
                "**/src/**/*.{ts,tsx}",
                "!**/src/**/__tests__/**",
                "!**/src/**/?(*.)(spec|test).*",
                "!**/src/setupProxy.*",
                "!**/src/setupTests.*",
              ],
              silent: true,
              // The formatter is invoked directly in WebpackDevServerUtils during development
              formatter: isEnvProduction ? typescriptFormatter : undefined,
            }),
          new ESLintPlugin({
            // Plugin options
            extensions: ["js", "mjs", "jsx", "ts", "tsx"],
            formatter: require.resolve("react-dev-utils/eslintFormatter"),
            eslintPath: require.resolve("eslint"),
            context: paths.appSrc,
            cache: true,
            // ESLint class options
            cwd: paths.appPath,
            resolvePluginsRelativeTo: __dirname,
            baseConfig: {
              extends: [require.resolve("eslint-config-react-app/base")],
              rules: {
                ...(!hasJsxRuntime && {
                  "react/react-in-jsx-scope": "error",
                }),
              },
            },
          }),
        ].filter(Boolean),
        // Some libraries import Node modules but don't use them in the browser.
        // Tell webpack to provide empty mocks for them so importing them works.
        node: {
          module: "empty",
          dgram: "empty",
          dns: "mock",
          fs: "empty",
          http2: "empty",
          net: "empty",
          tls: "empty",
          child_process: "empty",
        },
        // Turn off performance processing because we utilize
        // our own hints via the FileSizeReporter
        performance: false,
      };
    };
    

    -参考:https://juejin.cn/post/6844904132696866830

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