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Jotai is literally like a single file.

Here's a video on how to use Jotai by writing your own in minutes: https://youtu.be/gg31JTZmFUw

Jotai may be small and focused, but is definitely not a single file: https://github.com/pmndrs/jotai/tree/main/src/

Yes, sorry my bad, the project isn't a single file. I was just talking about the implementation.