2.8.0 - Webpack 4, Babel 7

config/webpackDevServer.config.js

@@ -1,10 +1,12 @@
 'use strict';
 
 const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
+const evalSourceMapMiddleware = require('react-dev-utils/evalSourceMapMiddleware');
 const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
-const path = require('path');
+const ignoredFiles = require('react-dev-utils/ignoredFiles');
 const config = require('./webpack.config.dev');
 const paths = require('./paths');
+const fs = require('fs');
 
 const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
 const host = process.env.HOST || '0.0.0.0';
@@ -17,8 +19,8 @@ module.exports = function(proxy, allowedHost) {
     // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
     // However, it made several existing use cases such as development in cloud
     // environment or subdomains in development significantly more complicated:
-    // https://github.com/facebookincubator/create-react-app/issues/2271
-    // https://github.com/facebookincubator/create-react-app/issues/2233
+    // https://github.com/facebook/create-react-app/issues/2271
+    // https://github.com/facebook/create-react-app/issues/2233
     // While we're investigating better solutions, for now we will take a
     // compromise. Since our WDS configuration only serves files in the `public`
     // folder we won't consider accessing them a vulnerability. However, if you
@@ -61,39 +63,42 @@ module.exports = function(proxy, allowedHost) {
     // as we specified in the config. In development, we always serve from /.
     publicPath: config.output.publicPath,
     // WebpackDevServer is noisy by default so we emit custom message instead
-    // by listening to the compiler events with `compiler.plugin` calls above.
+    // by listening to the compiler events with `compiler.hooks[...].tap` calls above.
     quiet: true,
     // Reportedly, this avoids CPU overload on some systems.
-    // https://github.com/facebookincubator/create-react-app/issues/293
+    // https://github.com/facebook/create-react-app/issues/293
     // src/node_modules is not ignored to support absolute imports
-    // https://github.com/facebookincubator/create-react-app/issues/1065
+    // https://github.com/facebook/create-react-app/issues/1065
     watchOptions: {
-      ignored: new RegExp(
-        `^(?!${path
-          .normalize(paths.appSrc + '/')
-          .replace(/[\\]+/g, '\\\\')}).+[\\\\/]node_modules[\\\\/]`,
-        'g'
-      ),
+      ignored: ignoredFiles(paths.appSrc),
     },
     // Enable HTTPS if the HTTPS environment variable is set to 'true'
     https: protocol === 'https',
-    host: host,
+    host,
     overlay: false,
     historyApiFallback: {
       // Paths with dots should still use the history fallback.
-      // See https://github.com/facebookincubator/create-react-app/issues/387.
+      // See https://github.com/facebook/create-react-app/issues/387.
       disableDotRule: true,
     },
     public: allowedHost,
     proxy,
-    before(app) {
+    before(app, server) {
+      if (fs.existsSync(paths.proxySetup)) {
+        // This registers user provided middleware for proxy reasons
+        require(paths.proxySetup)(app);
+      }
+
+      // This lets us fetch source contents from webpack for the error overlay
+      app.use(evalSourceMapMiddleware(server));
       // This lets us open files from the runtime error overlay.
       app.use(errorOverlayMiddleware());
+
       // This service worker file is effectively a 'no-op' that will reset any
       // previous service worker registered for the same host:port combination.
       // We do this in development to avoid hitting the production cache if
       // it used the same host and port.
-      // https://github.com/facebookincubator/create-react-app/issues/2272#issuecomment-302832432
+      // https://github.com/facebook/create-react-app/issues/2272#issuecomment-302832432
       app.use(noopServiceWorkerMiddleware());
     },
   };