Added NamedModulesPlugin in webpack.config.dev.js (#2458)

* Added NamedModulesPlugin in webpack.config.dev.js

* Update webpack.config.dev.js

Author: Zaccc123

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

@@ -249,6 +249,8 @@ module.exports = {
       inject: true,
       template: paths.appHtml,
     }),
+    // Add module names to factory functions so they appear in browser profiler.
+    new webpack.NamedModulesPlugin(),
     // 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),