createConfig.js

'use strict';

const fs = require('fs-extra');
const path = require('path');
const webpack = require('webpack');
const UglifyJsPlugin = require('uglifyjs-webpack-plugin');
const nodeExternals = require('webpack-node-externals');
const AssetsPlugin = require('assets-webpack-plugin');
const StartServerPlugin = require('start-server-webpack-plugin');
const eslintFormatter = require('react-dev-utils/eslintFormatter');
const autoprefixer = require('autoprefixer');
const MiniCssExtractPlugin = require('mini-css-extract-plugin');
const paths = require('./paths');
const runPlugin = require('./runPlugin');
const getClientEnv = require('./env').getClientEnv;
const nodePath = require('./env').nodePath;
const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
const WebpackBar = require('webpackbar');

const postCssOptions = {
  ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
  plugins: () => [
    require('postcss-flexbugs-fixes'),
    autoprefixer({
      browsers: [
        '>1%',
        'last 4 versions',
        'Firefox ESR',
        'not ie < 9', // React doesn't support IE8 anyway
      ],
      flexbox: 'no-2009',
    }),
  ],
};

// This is the Webpack configuration factory. It's the juice!
module.exports = (
  target = 'web',
  env = 'dev',
  {
    clearConsole = true,
    host = 'localhost',
    port = 3000,
    modify,
    plugins,
    modifyBabelOptions,
  },
  webpackObject
) => {
  // First we check to see if the user has a custom .babelrc file, otherwise
  // we just use babel-preset-razzle.
  const hasBabelRc = fs.existsSync(paths.appBabelRc);
  const mainBabelOptions = {
    babelrc: true,
    cacheDirectory: true,
    presets: [],
  };

  const hasEslintRc = fs.existsSync(paths.appEslintRc);
  const mainEslintOptions = {
    formatter: eslintFormatter,
    eslintPath: require.resolve('eslint'),

    ignore: false,
    useEslintrc: true,
  };

  if (!hasBabelRc) {
    mainBabelOptions.presets.push(require.resolve('../babel'));
  }

  // Allow app to override babel options
  const babelOptions = modifyBabelOptions
    ? modifyBabelOptions(mainBabelOptions)
    : mainBabelOptions;

  if (hasBabelRc && babelOptions.babelrc) {
    console.log('Using .babelrc defined in your app root');
  }

  if (hasEslintRc) {
    console.log('Using .eslintrc defined in your app root');
  } else {
    mainEslintOptions.baseConfig = {
      extends: [require.resolve('eslint-config-react-app')],
    };
    mainEslintOptions.useEslintrc = false;
  }

  // Define some useful shorthands.
  const IS_NODE = target === 'node';
  const IS_WEB = target === 'web';
  const IS_PROD = env === 'prod';
  const IS_DEV = env === 'dev';
  process.env.NODE_ENV = IS_PROD ? 'production' : 'development';

  const dotenv = getClientEnv(target, { clearConsole, host, port });

  const devServerPort = parseInt(dotenv.raw.PORT, 10) + 1;
  // VMs, Docker containers might not be available at localhost:3001. CLIENT_PUBLIC_PATH can override.
  const clientPublicPath =
    dotenv.raw.CLIENT_PUBLIC_PATH ||
    (IS_DEV ? `http://${dotenv.raw.HOST}:${devServerPort}/` : '/');

  // This is our base webpack config.
  let config = {
    // Set webpack mode:
    mode: IS_DEV ? 'development' : 'production',
    // Set webpack context to the current command's directory
    context: process.cwd(),
    // Specify target (either 'node' or 'web')
    target: target,
    // Controversially, decide on sourcemaps.
    devtool: IS_DEV ? 'cheap-module-source-map' : 'source-map',
    // We need to tell webpack how to resolve both Razzle's node_modules and
    // the users', so we use resolve and resolveLoader.
    resolve: {
      modules: ['node_modules', paths.appNodeModules].concat(
        // It is guaranteed to exist because we tweak it in `env.js`
        nodePath.split(path.delimiter).filter(Boolean)
      ),
      extensions: ['.mjs', '.jsx', '.js', '.json'],
      alias: {
        // This is required so symlinks work during development.
        'webpack/hot/poll': require.resolve('webpack/hot/poll'),
        // 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',
      },
    },
    resolveLoader: {
      modules: [paths.appNodeModules, paths.ownNodeModules],
    },
    module: {
      strictExportPresence: true,
      rules: [
        // Disable require.ensure as it's not a standard language feature.
        // { parser: { requireEnsure: false } },
        {
          test: /\.(js|jsx|mjs)$/,
          enforce: 'pre',
          use: [
            {
              options: mainEslintOptions,
              loader: require.resolve('eslint-loader'),
            },
          ],
          include: paths.appSrc,
        },
        // Avoid "require is not defined" errors
        {
          test: /\.mjs$/,
          include: /node_modules/,
          type: 'javascript/auto',
        },
        // Transform ES6 with Babel
        {
          test: /\.(js|jsx|mjs)$/,
          include: [paths.appSrc],
          use: [
            {
              loader: require.resolve('babel-loader'),
              options: babelOptions,
            },
          ],
        },
        {
          exclude: [
            /\.html$/,
            /\.(js|jsx|mjs)$/,
            /\.(ts|tsx)$/,
            /\.(vue)$/,
            /\.(less)$/,
            /\.(re)$/,
            /\.(s?css|sass)$/,
            /\.json$/,
            /\.bmp$/,
            /\.gif$/,
            /\.jpe?g$/,
            /\.png$/,
          ],
          loader: require.resolve('file-loader'),
          options: {
            name: 'static/media/[name].[hash:8].[ext]',
            emitFile: true,
          },
        },
        // "url" loader works like "file" loader except that it embeds assets
        // smaller than specified limit in bytes as data URLs to avoid requests.
        // A missing `test` is equivalent to a match.
        {
          test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
          loader: require.resolve('url-loader'),
          options: {
            limit: 10000,
            name: 'static/media/[name].[hash:8].[ext]',
            emitFile: true,
          },
        },

        // "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.
        //
        // Note: this yields the exact same CSS config as create-react-app.
        {
          test: /\.css$/,
          exclude: [paths.appBuild, /\.module\.css$/],
          use: IS_NODE
            ? // Style-loader does not work in Node.js without some crazy
              // magic. Luckily we just need css-loader.
              [
                {
                  loader: require.resolve('css-loader'),
                  options: {
                    importLoaders: 1,
                  },
                },
              ]
            : IS_DEV
              ? [
                  require.resolve('style-loader'),
                  {
                    loader: require.resolve('css-loader'),
                    options: {
                      importLoaders: 1,
                    },
                  },
                  {
                    loader: require.resolve('postcss-loader'),
                    options: postCssOptions,
                  },
                ]
              : [
                  MiniCssExtractPlugin.loader,
                  {
                    loader: require.resolve('css-loader'),
                    options: {
                      importLoaders: 1,
                      modules: false,
                      minimize: true,
                    },
                  },
                  {
                    loader: require.resolve('postcss-loader'),
                    options: postCssOptions,
                  },
                ],
        },
        // Adds support for CSS Modules (https://github.com/css-modules/css-modules)
        // using the extension .module.css
        {
          test: /\.module\.css$/,
          exclude: [paths.appBuild],
          use: IS_NODE
            ? [
                {
                  // on the server we do not need to embed the css and just want the identifier mappings
                  // https://github.com/webpack-contrib/css-loader#scope
                  loader: require.resolve('css-loader/locals'),
                  options: {
                    modules: true,
                    importLoaders: 1,
                    localIdentName: '[path]__[name]___[local]',
                  },
                },
              ]
            : IS_DEV
              ? [
                  require.resolve('style-loader'),
                  {
                    loader: require.resolve('css-loader'),
                    options: {
                      modules: true,
                      importLoaders: 1,
                      localIdentName: '[path]__[name]___[local]',
                    },
                  },
                  {
                    loader: require.resolve('postcss-loader'),
                    options: postCssOptions,
                  },
                ]
              : [
                  MiniCssExtractPlugin.loader,
                  {
                    loader: require.resolve('css-loader'),
                    options: {
                      modules: true,
                      importLoaders: 1,
                      minimize: true,
                      localIdentName: '[path]__[name]___[local]',
                    },
                  },
                  {
                    loader: require.resolve('postcss-loader'),
                    options: postCssOptions,
                  },
                ],
        },
      ],
    },
  };

  if (IS_NODE) {
    // We want to uphold node's __filename, and __dirname.
    config.node = {
      __console: false,
      __dirname: false,
      __filename: false,
    };

    // We need to tell webpack what to bundle into our Node bundle.
    config.externals = [
      nodeExternals({
        whitelist: [
          IS_DEV ? 'webpack/hot/poll?300' : null,
          /\.(eot|woff|woff2|ttf|otf)$/,
          /\.(svg|png|jpg|jpeg|gif|ico)$/,
          /\.(mp4|mp3|ogg|swf|webp)$/,
          /\.(css|scss|sass|sss|less)$/,
        ].filter(x => x),
      }),
    ];

    // Specify webpack Node.js output path and filename
    config.output = {
      path: paths.appBuild,
      publicPath: clientPublicPath,
      filename: 'server.js',
      libraryTarget: 'commonjs2',
    };
    // Add some plugins...
    config.plugins = [
      // We define environment variables that can be accessed globally in our
      new webpack.DefinePlugin(dotenv.stringified),
      // Prevent creating multiple chunks for the server
      new webpack.optimize.LimitChunkCountPlugin({
        maxChunks: 1,
      }),
    ];

    config.entry = [paths.appServerIndexJs];

    if (IS_DEV) {
      // Use watch mode
      config.watch = true;
      config.entry.unshift('webpack/hot/poll?300');

      // Pretty format server errors
      config.entry.unshift('razzle-dev-utils/prettyNodeErrors');

      const nodeArgs = ['-r', 'source-map-support/register'];

      // Passthrough --inspect and --inspect-brk flags (with optional [host:port] value) to node
      if (process.env.INSPECT_BRK) {
        nodeArgs.push(process.env.INSPECT_BRK);
      } else if (process.env.INSPECT) {
        nodeArgs.push(process.env.INSPECT);
      }

      config.plugins = [
        ...config.plugins,
        // Add hot module replacement
        new webpack.HotModuleReplacementPlugin(),
        // Supress errors to console (we use our own logger)
        new StartServerPlugin({
          name: 'server.js',
          nodeArgs,
        }),
        // Ignore assets.json to avoid infinite recompile bug
        new webpack.WatchIgnorePlugin([paths.appManifest]),
      ];
    }
  }

  if (IS_WEB) {
    config.plugins = [
      // Output our JS and CSS files in a manifest file called assets.json
      // in the build directory.
      new AssetsPlugin({
        path: paths.appBuild,
        filename: 'assets.json',
      }),
      // Maybe we should move to this???
      // new ManifestPlugin({
      //   path: paths.appBuild,
      //   writeToFileEmit: true,
      //   filename: 'manifest.json',
      // }),
    ];

    if (IS_DEV) {
      // Setup Webpack Dev Server on port 3001 and
      // specify our client entry point /client/index.js
      config.entry = {
        client: [
          // We ship a few polyfills by default but only include them if React is being placed in
          // the default path. If you are doing some vendor bundling, you'll need to require the razzle/polyfills
          // on your own.
          !dotenv.raw.REACT_BUNDLE_PATH && require.resolve('./polyfills'),
          require.resolve('razzle-dev-utils/webpackHotDevClient'),
          paths.appClientIndexJs,
        ].filter(Boolean),
      };

      // Configure our client bundles output. Not the public path is to 3001.
      config.output = {
        path: paths.appBuildPublic,
        publicPath: clientPublicPath,
        pathinfo: true,
        libraryTarget: 'var',
        filename: 'static/js/bundle.js',
        chunkFilename: 'static/js/[name].chunk.js',
        devtoolModuleFilenameTemplate: info =>
          path.resolve(info.resourcePath).replace(/\\/g, '/'),
      };
      // Configure webpack-dev-server to serve our client-side bundle from
      // http://${dotenv.raw.HOST}:3001
      config.devServer = {
        disableHostCheck: true,
        clientLogLevel: 'none',
        // Enable gzip compression of generated files.
        compress: true,
        // watchContentBase: true,
        headers: {
          'Access-Control-Allow-Origin': '*',
        },
        historyApiFallback: {
          // Paths with dots should still use the history fallback.
          // See https://github.com/facebookincubator/create-react-app/issues/387.
          disableDotRule: true,
        },
        host: dotenv.raw.HOST,
        hot: true,
        noInfo: true,
        overlay: false,
        port: devServerPort,
        quiet: true,
        // By default files from `contentBase` will not trigger a page reload.
        // Reportedly, this avoids CPU overload on some systems.
        // https://github.com/facebookincubator/create-react-app/issues/293
        watchOptions: {
          ignored: /node_modules/,
        },
        before(app) {
          // This lets us open files from the runtime error overlay.
          app.use(errorOverlayMiddleware());
        },
      };
      // Add client-only development plugins
      config.plugins = [
        ...config.plugins,
        new webpack.HotModuleReplacementPlugin({
          multiStep: true,
        }),
        new webpack.DefinePlugin(dotenv.stringified),
      ];

      config.optimization = {
        // @todo automatic vendor bundle
        // Automatically split vendor and commons
        // https://twitter.com/wSokra/status/969633336732905474
        // splitChunks: {
        //   chunks: 'all',
        // },
        // Keep the runtime chunk seperated to enable long term caching
        // https://twitter.com/wSokra/status/969679223278505985
        // runtimeChunk: true,
      };
    } else {
      // Specify production entry point (/client/index.js)
      config.entry = {
        client: [
          // We ship a few polyfills by default but only include them if React is being placed in
          // the default path. If you are doing some vendor bundling, you'll need to require the razzle/polyfills
          // on your own.
          !dotenv.raw.REACT_BUNDLE_PATH && require.resolve('./polyfills'),
          paths.appClientIndexJs,
        ].filter(Boolean),
      };

      // Specify the client output directory and paths. Notice that we have
      // changed the publiPath to just '/' from http://localhost:3001. This is because
      // we will only be using one port in production.
      config.output = {
        path: paths.appBuildPublic,
        publicPath: dotenv.raw.PUBLIC_PATH || '/',
        filename: 'static/js/bundle.[chunkhash:8].js',
        chunkFilename: 'static/js/[name].[chunkhash:8].chunk.js',
        libraryTarget: 'var',
      };

      config.plugins = [
        ...config.plugins,
        // Define production environment vars
        new webpack.DefinePlugin(dotenv.stringified),
        // Extract our CSS into a files.
        new MiniCssExtractPlugin({
          filename: 'static/css/bundle.[contenthash:8].css',
          chunkFilename: 'static/css/[name].[contenthash:8].chunk.css',
          // allChunks: true because we want all css to be included in the main
          // css bundle when doing code splitting to avoid FOUC:
          // https://github.com/facebook/create-react-app/issues/2415
          allChunks: true,
        }),
        new webpack.HashedModuleIdsPlugin(),
        new webpack.optimize.AggressiveMergingPlugin(),
      ];

      config.optimization = {
        minimize: true,
        minimizer: [
          new UglifyJsPlugin({
            uglifyOptions: {
              parse: {
                // we want uglify-js to parse ecma 8 code. However, we don't want it
                // to apply any minfication 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,
              },
              mangle: {
                safari10: true,
              },
              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,
              },
            },
            // Use multi-process parallel running to improve the build speed
            // Default number of concurrent runs: os.cpus().length - 1
            parallel: true,
            // Enable file caching
            cache: true,
            // @todo add flag for sourcemaps
            sourceMap: true,
          }),
        ],
        // @todo automatic vendor bundle
        // Automatically split vendor and commons
        // https://twitter.com/wSokra/status/969633336732905474
        // splitChunks: {
        //   chunks: 'all',
        //   minSize: 30000,
        //   minChunks: 1,
        //   maxAsyncRequests: 5,
        //   maxInitialRequests: 3,
        //   name: true,
        //   cacheGroups: {
        //     commons: {
        //       test: /[\\/]node_modules[\\/]/,
        //       name: 'vendor',
        //       chunks: 'all',
        //     },
        //     main: {
        //       chunks: 'all',
        //       minChunks: 2,
        //       reuseExistingChunk: true,
        //       enforce: true,
        //     },
        //   },
        // },
        // Keep the runtime chunk seperated to enable long term caching
        // https://twitter.com/wSokra/status/969679223278505985
        // runtimeChunk: true,
      };
    }
  }

  if (IS_DEV) {
    config.plugins = [
      ...config.plugins,
      // Use our own FriendlyErrorsPlugin during development.
      // new FriendlyErrorsPlugin({
      //   verbose: dotenv.raw.VERBOSE,
      //   target,
      //   onSuccessMessage: `Your application is running at http://${
      //     dotenv.raw.HOST
      //   }:${dotenv.raw.PORT}`,
      // }),
      new WebpackBar({
        color: target === 'web' ? '#f56be2' : '#c065f4',
        name: target === 'web' ? 'client' : 'server',
      }),
    ];
  }

  // Apply razzle plugins, if they are present in razzle.config.js
  if (Array.isArray(plugins)) {
    plugins.forEach(plugin => {
      config = runPlugin(
        plugin,
        config,
        { target, dev: IS_DEV },
        webpackObject
      );
    });
  }

  // Check if razzle.config has a modify function. If it does, call it on the
  // configs we created.
  if (modify) {
    config = modify(config, { target, dev: IS_DEV }, webpackObject);
  }

  return config;
};