Not the answer you're looking for? this is a new line you shall copy into your code, and this is a line to be removed from your code, // Lodash, currently included via a script, is required for this line to work, "test": "echo \"Error: no test specified\" && exit 1". This article is part of series on adding React to an existing server side rendered application. This will open the browser automatically and launch your application in http://localhost:3000. 2. Webpack is a powerful bundling tool for your front-end applications. If you want to modify Webpack.config for this project you can run yarn eject/npm eject from here on you are responsible for the Webpack.config so it will be harder to update react scripts. Install babel-loader by writing this code: npm i -D @babel/core @babel/preset-env @babel/preset-react babel-loader. window. My DMs on Twitter are open if you have any questions regarding the app ? It's a mistake because source control is for "source code", not "build artifacts". It's a common newbie mistake to add Webpack build outputs like main.js to source control. After this, we can remove the