Upgrade to webpack v2

packages/babel-preset-react-app/index.js

@@ -88,7 +88,11 @@ if (env === 'test') {
   module.exports = {
     presets: [
       // Latest stable ECMAScript features
-      require.resolve('babel-preset-latest'),
+      [require.resolve('babel-preset-latest'), {
+        'es2015': {
+          modules: false
+        }
+      }],
       // JSX, Flow
       require.resolve('babel-preset-react')
     ],

packages/react-scripts/config/webpack.config.dev.js

@@ -78,15 +78,15 @@ module.exports = {
   resolve: {
     // This allows you to set a fallback for where Webpack should look for modules.
     // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
-    // We use `fallback` instead of `root` because we want `node_modules` to "win"
-    // if there any conflicts. This matches Node resolution mechanism.
+    // 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/facebookincubator/create-react-app/issues/253
-    fallback: paths.nodePaths,
+    modules: ['node_modules'].concat(paths.nodePaths),
     // 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/facebookincubator/create-react-app/issues/290
-    extensions: ['.js', '.json', '.jsx', ''],
+    extensions: ['.js', '.json', '.jsx'],
     alias: {
       // Support React Native Web
       // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
@@ -97,21 +97,32 @@ module.exports = {
   // Resolve loaders (webpack plugins for CSS, images, transpilation) from the
   // directory of `react-scripts` itself rather than the project directory.
   resolveLoader: {
-    root: paths.ownNodeModules,
-    moduleTemplates: ['*-loader']
+    modules: [
+      paths.ownNodeModules,
+      // Lerna hoists everything, so we need to look in our app directory
+      paths.appNodeModules
+    ]
   },
   // @remove-on-eject-end
   module: {
-    // First, run the linter.
-    // It's important to do this before Babel processes the JS.
-    preLoaders: [
+    rules: [
+      // First, run the linter.
+      // It's important to do this before Babel processes the JS.
       {
         test: /\.(js|jsx)$/,
-        loader: 'eslint',
-        include: paths.appSrc,
-      }
-    ],
-    loaders: [
+        enforce: 'pre',
+        use: [{
+          // @remove-on-eject-begin
+          // Point ESLint to our predefined config.
+          options: {
+            configFile: path.join(__dirname, '../.eslintrc'),
+            useEslintrc: false
+          },
+          // @remove-on-eject-end
+          loader: 'eslint-loader'
+        }],
+        include: paths.appSrc
+      },
       // ** ADDING/UPDATING LOADERS **
       // The "url" loader handles all assets unless explicitly excluded.
       // The `exclude` list *must* be updated with every change to loader extensions.
@@ -128,8 +139,8 @@ module.exports = {
           /\.json$/,
           /\.svg$/
         ],
-        loader: 'url',
-        query: {
+        loader: 'url-loader',
+        options: {
           limit: 10000,
           name: 'static/media/[name].[hash:8].[ext]'
         }
@@ -138,8 +149,8 @@ module.exports = {
       {
         test: /\.(js|jsx)$/,
         include: paths.appSrc,
-        loader: 'babel',
-        query: {
+        loader: 'babel-loader',
+        options: {
           // @remove-on-eject-begin
           babelrc: false,
           presets: [require.resolve('babel-preset-react-app')],
@@ -157,46 +168,44 @@ module.exports = {
       // in development "style" loader enables hot editing of CSS.
       {
         test: /\.css$/,
-        loader: 'style!css?importLoaders=1!postcss'
-      },
-      // JSON is not enabled by default in Webpack but both Node and Browserify
-      // allow it implicitly so we also enable it.
-      {
-        test: /\.json$/,
-        loader: 'json'
+        use: [
+          'style-loader', {
+            loader: 'css-loader',
+            options: {
+              importLoaders: 1
+            }
+          }, {
+            loader: 'postcss-loader',
+            options: {
+              ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
+              plugins: function () {
+                return [
+                  autoprefixer({
+                    browsers: [
+                      '>1%',
+                      'last 4 versions',
+                      'Firefox ESR',
+                      'not ie < 9', // React doesn't support IE8 anyway
+                    ]
+                  })
+                ]
+              }
+            }
+          }
+        ]
       },
       // "file" loader for svg
       {
         test: /\.svg$/,
-        loader: 'file',
-        query: {
+        loader: 'file-loader',
+        options: {
           name: 'static/media/[name].[hash:8].[ext]'
         }
       }
       // ** STOP ** Are you adding a new loader?
       // Remember to add the new extension(s) to the "url" loader exclusion list.
     ]
   },
-  // @remove-on-eject-begin
-  // Point ESLint to our predefined config.
-  eslint: {
-    configFile: path.join(__dirname, '../.eslintrc'),
-    useEslintrc: false
-  },
-  // @remove-on-eject-end
-  // We use PostCSS for autoprefixing only.
-  postcss: function() {
-    return [
-      autoprefixer({
-        browsers: [
-          '>1%',
-          'last 4 versions',
-          'Firefox ESR',
-          'not ie < 9', // React doesn't support IE8 anyway
-        ]
-      }),
-    ];
-  },
   plugins: [
     // Makes some environment variables available in index.html.
     // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
@@ -229,5 +238,11 @@ module.exports = {
     fs: 'empty',
     net: 'empty',
     tls: 'empty'
+  },
+  // Turn off performance hints during development because we don't do any
+  // splitting or minification in interest of speed. These warnings become
+  // cumbersome.
+  performance: {
+    hints: false
   }
 };

packages/react-scripts/config/webpack.config.prod.js

@@ -52,8 +52,8 @@ const cssFilename = 'static/css/[name].[contenthash:8].css';
 // To have this structure working with relative paths, we have to use custom options.
 const extractTextPluginOptions = shouldUseRelativeAssetPaths
   // Making sure that the publicPath goes back to to build folder.
-  ? { publicPath: Array(cssFilename.split('/').length).join('../') }
-  : undefined;
+  ? {publicPath: Array(cssFilename.split('/').length).join('../')}
+  : {};
 
 // This is the production configuration.
 // It compiles slowly and is focused on producing a fast and minimal bundle.
@@ -83,15 +83,15 @@ module.exports = {
   resolve: {
     // This allows you to set a fallback for where Webpack should look for modules.
     // We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
-    // We use `fallback` instead of `root` because we want `node_modules` to "win"
-    // if there any conflicts. This matches Node resolution mechanism.
+    // 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/facebookincubator/create-react-app/issues/253
-    fallback: paths.nodePaths,
+    modules: ['node_modules'].concat(paths.nodePaths),
     // 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/facebookincubator/create-react-app/issues/290
-    extensions: ['.js', '.json', '.jsx', ''],
+    extensions: ['.js', '.json', '.jsx'],
     alias: {
       // Support React Native Web
       // https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
@@ -102,21 +102,34 @@ module.exports = {
   // Resolve loaders (webpack plugins for CSS, images, transpilation) from the
   // directory of `react-scripts` itself rather than the project directory.
   resolveLoader: {
-    root: paths.ownNodeModules,
-    moduleTemplates: ['*-loader']
+    modules: [
+      paths.ownNodeModules,
+      // Lerna hoists everything, so we need to look in our app directory
+      paths.appNodeModules
+    ]
   },
   // @remove-on-eject-end
   module: {
-    // First, run the linter.
-    // It's important to do this before Babel processes the JS.
-    preLoaders: [
+    rules: [
+      // First, run the linter.
+      // It's important to do this before Babel processes the JS.
       {
         test: /\.(js|jsx)$/,
-        loader: 'eslint',
+        enforce: 'pre',
+        use: [{
+          // @remove-on-eject-begin
+          // Point ESLint to our predefined config.
+          options: {
+            // TODO: consider separate config for production,
+            // e.g. to enable no-console and no-debugger only in production.
+            configFile: path.join(__dirname, '../.eslintrc'),
+            useEslintrc: false
+          },
+          // @remove-on-eject-end
+          loader: 'eslint-loader'
+        }],
         include: paths.appSrc
-      }
-    ],
-    loaders: [
+      },
       // ** ADDING/UPDATING LOADERS **
       // The "url" loader handles all assets unless explicitly excluded.
       // The `exclude` list *must* be updated with every change to loader extensions.
@@ -133,8 +146,8 @@ module.exports = {
           /\.json$/,
           /\.svg$/
         ],
-        loader: 'url',
-        query: {
+        loader: 'url-loader',
+        options: {
           limit: 10000,
           name: 'static/media/[name].[hash:8].[ext]'
         }
@@ -143,9 +156,9 @@ module.exports = {
       {
         test: /\.(js|jsx)$/,
         include: paths.appSrc,
-        loader: 'babel',
+        loader: 'babel-loader',
         // @remove-on-eject-begin
-        query: {
+        options: {
           babelrc: false,
           presets: [require.resolve('babel-preset-react-app')],
         },
@@ -165,53 +178,48 @@ module.exports = {
       // in the main CSS file.
       {
         test: /\.css$/,
-        loader: ExtractTextPlugin.extract(
-          'style',
-          'css?importLoaders=1!postcss',
-          extractTextPluginOptions
-        )
+        loader: ExtractTextPlugin.extract(Object.assign({
+          fallback: 'style-loader',
+          use: [
+            {
+              loader: 'css-loader',
+              options: {
+                importLoaders: 1
+              }
+            }, {
+              loader: 'postcss-loader',
+              options: {
+                ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
+                plugins: function () {
+                  return [
+                    autoprefixer({
+                      browsers: [
+                        '>1%',
+                        'last 4 versions',
+                        'Firefox ESR',
+                        'not ie < 9', // React doesn't support IE8 anyway
+                      ]
+                    })
+                  ]
+                }
+              }
+            }
+          ]
+        }, extractTextPluginOptions))
         // Note: this won't work without `new ExtractTextPlugin()` in `plugins`.
       },
-      // JSON is not enabled by default in Webpack but both Node and Browserify
-      // allow it implicitly so we also enable it.
-      {
-        test: /\.json$/,
-        loader: 'json'
-      },
       // "file" loader for svg
       {
         test: /\.svg$/,
-        loader: 'file',
-        query: {
+        loader: 'file-loader',
+        options: {
           name: 'static/media/[name].[hash:8].[ext]'
         }
       }
       // ** STOP ** Are you adding a new loader?
       // Remember to add the new extension(s) to the "url" loader exclusion list.
     ]
   },
-  // @remove-on-eject-begin
-  // Point ESLint to our predefined config.
-  eslint: {
-    // TODO: consider separate config for production,
-    // e.g. to enable no-console and no-debugger only in production.
-    configFile: path.join(__dirname, '../.eslintrc'),
-    useEslintrc: false
-  },
-  // @remove-on-eject-end
-  // We use PostCSS for autoprefixing only.
-  postcss: function() {
-    return [
-      autoprefixer({
-        browsers: [
-          '>1%',
-          'last 4 versions',
-          'Firefox ESR',
-          'not ie < 9', // React doesn't support IE8 anyway
-        ]
-      }),
-    ];
-  },
   plugins: [
     // Makes some environment variables available in index.html.
     // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
@@ -241,10 +249,6 @@ module.exports = {
     // It is absolutely essential that NODE_ENV was set to production here.
     // Otherwise React will be compiled in the very slow development mode.
     new webpack.DefinePlugin(env.stringified),
-    // This helps ensure the builds are consistent if source hasn't changed:
-    new webpack.optimize.OccurrenceOrderPlugin(),
-    // Try to dedupe duplicated modules, if any:
-    new webpack.optimize.DedupePlugin(),
     // Minify the code.
     new webpack.optimize.UglifyJsPlugin({
       compress: {
@@ -257,10 +261,13 @@ module.exports = {
       output: {
         comments: false,
         screw_ie8: true
-      }
+      },
+      sourceMap: true
     }),
     // Note: this won't work without ExtractTextPlugin.extract(..) in `loaders`.
-    new ExtractTextPlugin(cssFilename),
+    new ExtractTextPlugin({
+      filename: cssFilename
+    }),
     // 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`.

packages/react-scripts/fixtures/kitchensink/.babelrc

@@ -1,3 +1,4 @@
 {
-  "presets": ["react-app"]
+  "presets": ["react-app"],
+  "plugins": ["babel-plugin-transform-es2015-modules-commonjs"]
 }