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Prettier can do HTML CSS and JS but I don't think there's any one tool that can do it all. (It would be interesting if there were something like a tree sitter for auto formatting)

I recently learned that tree-sitter does not have a goal of accurately representing the whole source input, and thus as it currently stands could not be used for that purpose

Now, whether a tree-sitter-esque ecosystem that is designed for source modeling could catch on like t-s did is a more interesting question

For Django projects, I would say DjLint [1]. It doesn't cover all you asked, but makes the job of writing the templates (HTML) much more pleasant.

[1] https://djlint.com/

If you already have tooling to cover each separately, why would it be better for it to be a single tool?

Django templates snippets get mixed inside CSS, JavaScript and HTML. So regular when CSS/JavaScript/HTML formatters get confused by those, it's not obvious what combination to use. I know of djLint but it's pretty slow.