Help me understand - custom cards and code

I have written a few custom cards for my own use. Nothing major just some header cards and one im working on for allergies. The question I have is when I go to look at the .js file of the cards I have installed via HACS the code does not look like the code that the dev wrote. What is the process here. I have a .js file for a card. What happens to the code as I enable it for HACS and then someone else installs it.

You likely copy-pasted code (.ts ?) that include obfuscating the “compiled” .js.