You’ve improved loading times for your application by creating an optimized build and converting JSX before deploying, and you relied on npm to isolate your project dependencies. You configured a faster build for development, which preserves the debug information. The build step allowed you to organize your code with modules without slowing down your application excessively.
In a larger code base, it’s important that you can test your components so that you don’t need to verify the entire application by hand every time you make a change. In the next chapter, we’ll extend the setup we created to add tests to our project and learn testing techniques for React components.
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