Create-react-app: where does Node.js store files?

Question

Node.js

I worked as a PHP backender, now I want to gradually learn Node.js and React. I found a tutorial video where everything is set up via create-react-app. Well, I installed it, launched it via npm run start - it works on localhost: 3000 I
open the source code (which the server gives), at the end of the HTML I see:

<script src="/static/js/bundle.js"></script><script src="/static/js/0.chunk.js"></script><script src="/static/js/main.chunk.js"></script></body>
</html>

I'm looking for these scripts for the project - nowhere, I'm looking for their addition in the code - also nowhere. The index.html file has everything, except for this line with the addition of scripts.
I don't like magic, and I'm very interested - where is the generated index.html given by the server stored, and where is this static folder in the file system ??