Brian McGee

> IIUC, this doesn't feel like a Haskell/Emacs problem. I'm not sure I totally grok the specific issue here (is this a monorepo with multiple "subprojects" with different formatting rules?),...

I'd welcome someone to help maintain the Windows side of things 🙏. I don't have a Windows setup, and haven't used it actively for a very long time.

I just did a quick test using `treefmt` directly using your sample `js` and the following config: ```toml [formatter.prettier] command = "prettier" options = ["--write"] includes = [ "*.js" ]...

@losnappas, thanks for the reproducer. I just checked it out and was able to replicate what you are seeing. This gives me something to investigate.

I've done some quick testing, and here's what I've found so far. I ejected the wrapped `treefmt` being used via `flake-parts` with `nix build .#` and: ```nix perSystem = {...

I found the issue. https://github.com/numtide/treefmt/pull/624/commits/b68d3286440c818d2452a65d3c503a7245447269 introduced a change to how we create temp files for processing stdin. Previously, we had been making a temporary file local to the file being...