Your React app is ready to ship. Congratulations! Packaging for production is (and should) be different from your development configuration. In the case of Create React App the toolchain is rich, includes development productivity conveniences such as hot reloading, source maps and custom environment variables. This toolchain is mind blowingly productive as you develop the app, npm start and watch the magic unfold. At this point, its possible to put the React app one big (~1.