create-react-app webpack4升级webpack5

loader: require.resolve('postcss-loader'),
        options: {
          // Necessary for external CSS imports to work
          // https://github.com/facebook/create-react-app/issues/2677
          postcssOptions: {
            ident: 'postcss',
            config: false,
            plugins:[
              'postcss-flexbugs-fixes',
              [
                '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.
              'postcss-normalize',
            ],
              // 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.
          },
         
          sourceMap: isEnvProduction && shouldUseSourceMap,
        },

// webpack.config.js 

const fs = require('fs');
const path = require('path');
const webpack = require('webpack');
const resolve = require('resolve');
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 {WebpackManifestPlugin} = require('webpack-manifest-plugin');
const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
const WorkboxWebpackPlugin = require('workbox-webpack-plugin');
const getCSSModuleLocalIdent = require('react-dev-utils/getCSSModuleLocalIdent');
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 postcssNormalize = require('postcss-normalize');

const appPackageJson = require(paths.appPackageJson);

// 是否生产map文件 cross-env修改
const shouldUseSourceMap = process.env.GENERATE_SOURCEMAP !== 'false';
//是否内联runtime文件
const shouldInlineRuntimeChunk = process.env.INLINE_RUNTIME_CHUNK !== 'false';

const isExtendingEslintConfig = process.env.EXTEND_ESLINT === 'true';
// 最小转化base64的图片大小
const imageInlineSizeLimit = parseInt(
  process.env.IMAGE_INLINE_SIZE_LIMIT || '10000'
);

// Check if TypeScript is setup
const useTypeScript = fs.existsSync(paths.appTsConfig);

// style files regexes 样式文件正则
const cssRegex = /\.css$/;
// const cssModuleRegex = /\.module\.css$/;
// const sassRegex = /\.(scss|sass)$/;
// const sassModuleRegex = /\.module\.(scss|sass)$/;

const Version=new Date().getTime();
var content ="getVersion('"+Version+"')"
fs.writeFile('public/version.js',content,function(err){
  if(err){
    return console.log(err)
  }
})



// This is the production and development configuration.
// It is focused on developer experience, fast rebuilds, and a minimal bundle.
// 生成最终webpack开发环境或者生成环境的配置
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.
  // 获取环境变量的方法 加载.env文件的环境变量， REACT_APP_开头
  const env = getClientEnvironment(paths.publicUrlOrPath.slice(0, -1));

  // common function to get style loaders
  // 获取处理样式文件loader的函数
  const getStyleLoaders = (cssOptions, preProcessor,lessOptions) => {
    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,
      },
      {
        loader: require.resolve('less-loader'),
        options: lessOptions,
      },
      {
        // 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'),
        },
      },
    ].filter(Boolean);
    if (preProcessor) {
      loaders.push(
        {
          loader: require.resolve('resolve-url-loader'),
          options: {
            sourceMap: isEnvProduction && shouldUseSourceMap,
          },
        },
        {
          loader: require.resolve(preProcessor),
          options: {
            sourceMap: true,
          },
        }
      );
    }
    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: [
      // 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'),
      isEnvDevelopment &&
        require.resolve('react-dev-utils/webpackHotDevClient'),
        'react-hot-loader/patch', // 添加本行
      // 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.
    ].filter(Boolean),
    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/[name].çbundle.js',
      // TODO: remove this when upgrading to webpack 5
      // 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.
      chunkLoadingGlobal: `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: {
      // 启用压缩
      minimize: isEnvProduction,
      minimizer: [
        // 压缩js
        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,
            },
          },
        }),
        // 压缩css
        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 || {}),
        '@src': path.resolve(__dirname, '../src'),
        actions: path.join(__dirname, 'src/actions'),
        assets: path.join(__dirname, 'src/assets'),
        components: path.join(__dirname, 'src/components'),
        '@constants': path.join(__dirname, 'src/constants'),
        pages: path.join(__dirname, 'src/pages'),
        utils: path.join(__dirname, 'src/utils'),
        "process": 'process/browser'
        
      },
      plugins: [
        // 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]),
      ],
      fallback: {
        "fs": false,
        "tls": false,
        "net": false,
        "path": false,
        "zlib": false,
        "http": false,
        "https": false,
        "stream": false,
        "crypto": false,
        "dgram": false,
        "http2": false,
        "child_process": false,
        "buffer": false,
        "url": false,
        "querystring": false
        // "process": false,
      } 
    },
    resolveLoader: {
      plugins: [
        // Also related to Plug'n'Play, but this time it tells webpack to load its loaders
        // from the current package.
      ],
    },
    module: {
      strictExportPresence: true,
      rules: [
        // Disable require.ensure as it's not a standard language feature.
        // { parser: { requireEnsure: false } },

        // First, run the linter.
        // It's important to do this before Babel processes the JS.
        {
          test: /\.(js|mjs|jsx|ts|tsx)$/,
          enforce: 'pre',
          use: [
            {
              options: {
                cache: true,
                formatter: require.resolve('react-dev-utils/eslintFormatter'),
                eslintPath: require.resolve('eslint'),
                resolvePluginsRelativeTo: __dirname,
                
              },
              loader: require.resolve('eslint-loader'),
            },
          ],
          include: paths.appSrc,
        },
        {
          // "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.
          // 数组里有且只有一个被优化
          oneOf: [
            // "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, // 建议20kb以下
                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'
                ),
                
                plugins: [
                  [
                    require.resolve('babel-plugin-named-asset-import'),
                    {
                      loaderMap: {
                        svg: {
                          ReactComponent:
                            '@svgr/webpack?-svgo,+titleProp,+ref![path]',
                        },
                      },
                    },
                  ],
                  //antd配置
                  [
                    require.resolve('babel-plugin-import'),
                    { 
                       libraryName: 'antd',
                       libraryDirectory: 'es',	//webpack1无需配置
                       style: 'css' 
                    }
                 ],
                 ['react-hot-loader/babel'], // 添加本行
                ],
                // 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,
              }),
              // 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,
                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,
            //     },
            //     '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,
            //       modules: {
            //         getLocalIdent: getCSSModuleLocalIdent,
            //       },
            //     },
            //     'sass-loader'
            //   ),
            // },
            //less增加配置
            {
              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'
              ),
            },
            // "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.
            
            //svg配置
            {
              test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
              use: [
                {
                  loader: 'babel-loader',
                },
                {
                  loader: '@svgr/webpack',
                  options: {
                    babel: false,
                    icon: true,
                  },
                },
              ],
            },
            {
              loader: require.resolve('file-loader'),
              // Exclude `js` files to keep "css" loader working as it injects
              // its runtime that would otherwise be processed through "file" loader.
              // Also exclude `html` and `json` extensions so they get processed
              // by webpacks internal loaders.
              exclude: [/\.(js|mjs|jsx|ts|tsx)$/, /\.html$/, /\.json$/],
              // exclude: [/(^|\.(svg|js|jsx|ts|tsx|html))$/],
              type: 'asset/resource',
              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: [
      new webpack.ProvidePlugin({ process: 'process/browser', }),
      // 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
      // 是否内联runtime文件 ，作用是少发一个请求 
      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.
      // 解析index.html中 &PULBLIC_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.
      // 定义环境变量
      new webpack.DefinePlugin(env.stringified),
      // This is necessary to emit hot updates (currently CSS only):
      // 开发环境下热模块替换
      isEnvDevelopment && new webpack.HotModuleReplacementPlugin(),
      // 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
      // 开发环境检查文件路径大小写
      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
      // 提取csds成单独文件
      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 WebpackManifestPlugin({
        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({
        resourceRegExp: /^\.\/locale$/,
        contextRegExp: /moment$/,
      }),
      // Generate a service worker script that will precache, and keep up to date,
      // the HTML & assets that are part of the webpack build.
      // PWA
      isEnvProduction &&
        new WorkboxWebpackPlugin.GenerateSW({
          clientsClaim: true,
          exclude: [/\.map$/, /asset-manifest\.json$/],
          // importWorkboxFrom: 'cdn',
          navigateFallback: paths.publicUrlOrPath + 'index.html',
          // navigateFallbackBlacklist: [
          //   // Exclude URLs starting with /_, as they're likely an API call
          //   new RegExp('^/_'),
          //   // Exclude any URLs whose last part seems to be a file extension
          //   // as they're likely a resource and not a SPA route.
          //   // URLs containing a "?" character won't be blacklisted as they're likely
          //   // a route with query params (e.g. auth callbacks).
          //   new RegExp('/[^/?]+\\.[^/]+$'),
          // ],
        }),
      // TypeScript type checking
      useTypeScript &&
        new ForkTsCheckerWebpackPlugin({
          typescript: resolve.sync('typescript', {
            basedir: paths.appNodeModules,
          }),
          async: isEnvDevelopment,
          useTypescriptIncrementalApi: true,
          checkSyntacticErrors: true,
          resolveModuleNameModule: process.versions.pnp
            ? `${__dirname}/pnpTs.js`
            : undefined,
          resolveTypeReferenceDirectiveModule: process.versions.pnp
            ? `${__dirname}/pnpTs.js`
            : undefined,
          tsconfig: paths.appTsConfig,
          reportFiles: [
            '**',
            '!**/__tests__/**',
            '!**/?(*.)(spec|test).*',
            '!**/src/setupProxy.*',
            '!**/src/setupTests.*',
          ],
          silent: true,
          // The formatter is invoked directly in WebpackDevServerUtils during development
          // formatter: isEnvProduction ? typescriptFormatter : undefined,
        }),
      
    ].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',
      // http2: 'empty',
      // net: 'empty',
      // tls: 'empty',
      // child_process: 'empty',
      // Buffer: false,
      // process: false,
    },
    // Turn off performance processing because we utilize
    // our own hints via the FileSizeReporter
    performance: false,
  };
};

// webpackDevServer.config.js 
'use strict';

const fs = require('fs');
const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
const evalSourceMapMiddleware = require('react-dev-utils/evalSourceMapMiddleware');
const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
const redirectServedPath = require('react-dev-utils/redirectServedPathMiddleware');
const paths = require('./paths');
const getHttpsConfig = require('./getHttpsConfig');

const host = process.env.HOST || '0.0.0.0';
module.exports = function(proxy, allowedHost) {
  return {
  allowedHosts: "all",
  compress: true,
  hot: true,
  client: false,
  devMiddleware: {
    publicPath: paths.publicUrlOrPath.slice(0, -1),
  },
  static: {
    directory: paths.appPublic,
    serveIndex: true,
    watch: true,
    publicPath: paths.publicUrlOrPath,
  },
  https: getHttpsConfig(),
  host,
  historyApiFallback: {
    disableDotRule: true,
    index: paths.publicUrlOrPath,
  },
  proxy,
  onBeforeSetupMiddleware(devServer) {
    devServer.app.use(evalSourceMapMiddleware(devServer.server));
    devServer.app.use(errorOverlayMiddleware());
    if (fs.existsSync(paths.proxySetup)) {
      require(paths.proxySetup)(devServer.app);
    }
  },
  onAfterSetupMiddleware(devServer) {
    devServer.app.use(redirectServedPath(paths.publicUrlOrPath))
    devServer.app.use(noopServiceWorkerMiddleware(paths.publicUrlOrPath))
    },
  };
};