Node SASS 的 React JS Webpack 失败

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【中文标题】Node SASS 的 React JS Webpack 失败【英文标题】:React JS Webpack failure for Node SASS 【发布时间】:2019-03-18 14:33:42 【问题描述】:

下面的代码是我的webpack.config.dev.js

我在运行 npm run eject 后得到了 webpack 配置,你可能已经知道了。

我安装了node-sasssass-loader 包。

我包含了 webpack 构建配置。

当我运行 npm start 时,我收到无效架构错误。如果我尝试解决这个问题,我会得到 我已经包含在项目中的 bootstrap 4 模块的模块导出错误。

webpack.config.dev.js

const path = require('path');
    const webpack = require('webpack');
    const PnpWebpackPlugin = require('pnp-webpack-plugin');
    const htmlWebpackPlugin = require('html-webpack-plugin');
    const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
    const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
    const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
    const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
    const getCSSModuleLocalIdent = require('react-dev-utils/getCSSModuleLocalIdent');
    const ManifestPlugin = require('webpack-manifest-plugin');
    const getCacheIdentifier = require('react-dev-utils/getCacheIdentifier');
    const ModuleNotFoundPlugin = require('react-dev-utils/ModuleNotFoundPlugin');
    const getClientEnvironment = require('./env');
    const paths = require('./paths');


// Webpack uses `publicPath` to determine where the app is being served from.
// In development, we always serve from the root. This makes config easier.
const publicPath = '/';
// `publicUrl` is just like `publicPath`, but we will provide it to our app
// as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in javascript.
// Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
const publicUrl = '';
// Get environment variables to inject into our app.
const env = getClientEnvironment(publicUrl);

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

// common function to get style loaders
const getStyleLoaders = (cssOptions, preProcessor) => 
  const loaders = [
    require.resolve('style-loader'),
    
      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,
          ),
        ],
      ,
    ,
    // ------------------------ Add SCSS Loaders --------------------------------
    // ------------------------ This where I am getting issue ------------ Help needed here
    
      test: /\.scss$/,
      loaders: [
        require.resolve('style-loader'),
        require.resolve('css-loader'),
        require.resolve('sass-loader')
      ],
    ,
    
      exclude: [/\.(js|jsx|mjs)$/, /\.html$/, /\.json$/, /\.scss$/],
      loader: require.resolve('file-loader'),
      options: 
        name: 'static/media/[name].[hash:8].[ext]',
      ,
    
  ];
  if (preProcessor) 
    loaders.push(require.resolve(preProcessor));
  
  return loaders;
;

// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = 
  mode: 'development',
  // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
  // See the discussion in https://github.com/facebook/create-react-app/issues/343
  devtool: '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'),
    require.resolve('react-dev-utils/webpackHotDevClient'),
    // 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.
  ],
  output: 
    // Add /* filename */ comments to generated require()s in the output.
    pathinfo: true,
    // This does not produce a real file. It's just the virtual path that is
    // served by WebpackDevServer in development. This is the JS bundle
    // containing code from all our entry points, and the Webpack runtime.
    filename: 'static/js/bundle.js',
    // There are also additional JS chunk files if you use code splitting.
    chunkFilename: 'static/js/[name].chunk.js',
    // This is the URL that app is served from. We use "/" in development.
    publicPath,
    // Point sourcemap entries to original disk location (format as URL on Windows)
    devtoolModuleFilenameTemplate: info => path.resolve(info.absoluteResourcePath).replace(/\\/g, '/'),
  ,
  optimization: 
    // 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 seperated to enable long term caching
    // https://twitter.com/wSokra/status/969679223278505985
    runtimeChunk: true,
  ,
  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'].concat(
      // It is guaranteed to exist because we tweak it in `env.js`
      process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
    ),
    // 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: ['.web.js', '.js', '.json', '.web.jsx', '.jsx'],
    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',
    ,
    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]),
    ],
  ,
  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  ,

      // First, run the linter.
      // It's important to do this before Babel processes the JS.
      
        test: /\.(js|jsx)$/,
        enforce: 'pre',
        use: [
          
            options: 
              formatter: require.resolve('react-dev-utils/eslintFormatter'),
              eslintPath: require.resolve('eslint'),
            ,
            loader: require.resolve('eslint-loader'),
          ,
        ],
        include: paths.appSrc,
      ,
      
        // `mjs` support is still in its infancy in the ecosystem, so we don't
        // support it.
        // Modules who define their `browser` or `module` key as `mjs` force
        // the use of this extension, so we need to tell webpack to fall back
        // to auto mode (ES Module interop, allows ESM to import CommonJS).
        test: /\.mjs$/,
        include: /node_modules/,
        type: 'javascript/auto',
      ,
      
        // "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: [
          // "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: 10000,
              name: 'static/media/[name].[hash:8].[ext]',
            ,
          ,
          // Process application JS with Babel.
          // The preset includes JSX, Flow, and some ESnext features.
          
            test: /\.(js|jsx)$/,
            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?-prettier,-svgo![path]',
                      ,
                    ,
                  ,
                ],
              ],
              // 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,
              // Don't waste time on Gzipping the cache
              cacheCompression: false,
            ,
          ,
          // Process any JS outside of the app with Babel.
          // Unlike the application JS, we only compile the standard ES features.
          
            test: /\.js$/,
            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,
              // Don't waste time on Gzipping the cache
              cacheCompression: false,
              // If an error happens in a package, it's possible to be
              // because it was compiled. Thus, we don't want the browser
              // debugger to show the original code. Instead, the code
              // being evaluated would be much more helpful.
              sourceMaps: false,
            ,
          ,
          // "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 a plugin 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,
            ),
          ,
          // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
          // using the extension .module.css
          
            test: cssModuleRegex,
            use: getStyleLoaders(
              importLoaders: 1,
              modules: true,
              getLocalIdent: getCSSModuleLocalIdent,
            ),
          ,
          // Opt-in support for SASS (using .scss or .sass extensions).
          // Chains the sass-loader with the css-loader and the style-loader
          // to immediately apply all styles to the DOM.
          // By default we support SASS Modules with the
          // extensions .module.scss or .module.sass
          
            test: sassRegex,
            exclude: sassModuleRegex,
            use: getStyleLoaders( importLoaders: 2 , 'sass-loader'),
          ,
          // Adds support for CSS Modules, but using SASS
          // using the extension .module.scss or .module.sass
          
            test: sassModuleRegex,
            use: getStyleLoaders(
              
                importLoaders: 2,
                modules: true,
                getLocalIdent: getCSSModuleLocalIdent,
              ,
              'sass-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.
          
            // 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|jsx)$/, /\.html$/, /\.json$/],
            loader: require.resolve('file-loader'),
            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(
      inject: true,
      template: paths.appHtml,
    ),
    // Makes some environment variables available in index.html.
    // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
    // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
    // In development, this will be an empty string.
    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 === 'development')  ... . See `./env.js`.
    new webpack.DefinePlugin(env.stringified),
    // This is necessary to emit hot updates (currently CSS only):
    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
    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
    new WatchMissingNodeModulesPlugin(paths.appNodeModules),
    // 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 manifest file which contains a mapping of all asset filenames
    // to their corresponding output file so that tools can pick it up without
    // having to parse `index.html`.
    new ManifestPlugin(
      fileName: 'asset-manifest.json',
      publicPath,
    ),
  ],

  // 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: 
    dgram: 'empty',
    fs: 'empty',
    net: 'empty',
    tls: 'empty',
    child_process: 'empty',
  ,
  // Turn off performance processing because we utilize
  // our own hints via the FileSizeReporter
  performance: false,
;

错误

Failed to compile.

Invalid configuration object. Webpack has been initialised using a configuration object that does not match the API schema.
 - configuration.module.rules[3].oneOf[6].use should be one of these:
   non-empty string | function | object  loader?, options?, ident?, query?  | function | [non-empty string | function | object  loader?, options?, ident?, query? ]
   -> Modifiers applied to the module when rule is matched
   Details:
    * configuration.module.rules[3].oneOf[3].use should be a string.
    * configuration.module.rules[3].oneOf[3].use should be an instance of function
    * configuration.module.rules[3].oneOf[3].use should be an object.
    * configuration.module.rules[3].oneOf[3].use should be an instance of function
    * configuration.module.rules[3].oneOf[3].use[3] should be a string.
    * configuration.module.rules[3].oneOf[3].use[3] should be an instance of function
    * configuration.module.rules[3].oneOf[3].use[3] has an unknown property 'test'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[3].use[3] has an unknown property 'loaders'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[3].use[4] should be a string.
    * configuration.module.rules[3].oneOf[3].use[4] should be an instance of function
    * configuration.module.rules[3].oneOf[3].use[4] has an unknown property 'exclude'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[4].use should be a string.
    * configuration.module.rules[3].oneOf[4].use should be an instance of function
    * configuration.module.rules[3].oneOf[4].use should be an object.
    * configuration.module.rules[3].oneOf[4].use should be an instance of function
    * configuration.module.rules[3].oneOf[4].use[3] should be a string.
    * configuration.module.rules[3].oneOf[4].use[3] should be an instance of function
    * configuration.module.rules[3].oneOf[4].use[3] has an unknown property 'test'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[4].use[3] has an unknown property 'loaders'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[4].use[4] should be a string.
    * configuration.module.rules[3].oneOf[4].use[4] should be an instance of function
    * configuration.module.rules[3].oneOf[4].use[4] has an unknown property 'exclude'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[5].use should be a string.
    * configuration.module.rules[3].oneOf[5].use should be an instance of function
    * configuration.module.rules[3].oneOf[5].use should be an object.
    * configuration.module.rules[3].oneOf[5].use should be an instance of function
    * configuration.module.rules[3].oneOf[5].use[3] should be a string.
    * configuration.module.rules[3].oneOf[5].use[3] should be an instance of function
    * configuration.module.rules[3].oneOf[5].use[3] has an unknown property 'test'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[5].use[3] has an unknown property 'loaders'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[5].use[4] should be a string.
    * configuration.module.rules[3].oneOf[5].use[4] should be an instance of function
    * configuration.module.rules[3].oneOf[5].use[4] has an unknown property 'exclude'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[6].use should be a string.
    * configuration.module.rules[3].oneOf[6].use should be an instance of function
    * configuration.module.rules[3].oneOf[6].use should be an object.
    * configuration.module.rules[3].oneOf[6].use should be an instance of function
    * configuration.module.rules[3].oneOf[6].use[3] should be a string.
    * configuration.module.rules[3].oneOf[6].use[3] should be an instance of function
    * configuration.module.rules[3].oneOf[6].use[3] has an unknown property 'test'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[6].use[3] has an unknown property 'loaders'. These properties are valid:
      object  loader?, options?, ident?, query? 
    * configuration.module.rules[3].oneOf[6].use[4] should be a string.
    * configuration.module.rules[3].oneOf[6].use[4] should be an instance of function
    * configuration.module.rules[3].oneOf[6].use[4] has an unknown property 'exclude'. These properties are valid:
      object  loader?, options?, ident?, query? 

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! data-engine@0.1.0 start: `node scripts/start.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the data-engine@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:

【问题讨论】:

请编辑您的问题并包含错误。 嗨,马特。我添加了终端输出。 【参考方案1】:

您不能在oneOf configuration 中指定多个加载程序。如错误所示,您只能使用这些对象属性:

 loader?, options?, ident?, query? 

这段代码很难理解,buuut

您不需要test: 键,因为它已经在具有test: sassModuleRegex....的块内。

我认为您根本不需要向getStyleLoaders 函数添加任何内容。从那里删除您的更改。我认为您只需要特定的正则表达式和配置:

            // Adds support for CSS Modules, but using SASS
            // using the extension .module.scss or .module.sass
            
                test: sassModuleRegex,
                use: getStyleLoaders(
                    
                        importLoaders: 2,
                        modules: true,
                        getLocalIdent: getCSSModuleLocalIdent,
                    ,
                    'sass-loader'
                ),
            ,

【讨论】:

> 1 | module.exports = webpack_public_path + "static/media/bootstrap.min.04aca1f4.css"; -- 尝试删除 getStyleLoaders 中包含的代码。我收到这个引导错误。任何帮助将不胜感激。

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