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Concur. This is a pretty good setup.

Caveat: I'm using Swift for command-line software.

What about a formatter? I recall having to figure out which library to install as binary just to do formatting. What do you do?

That's built in now -- the default VSCode "Format Document" / "Format Selection" commands work with just the Swift extension installed.

It has both of those. I use them from Emacs comfortably.

I'm not a Swiftie, but there's this if you're already on a Mac:

I think if you were already on a Mac and wanted to use Panic Nova, you'd be better off using Icaras:

The one you linked to looks like it's just syntax highlighting; Icarus has that, but also has LSP, building, and debugging support.