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ElixirLS can format code automatically on save so there is no need to configure the external `mix format` command. The same may be true for the other language servers as well. This is the reason why the author says that @zed.dev has some latency while @vscode.dev does not.

Oh that makes sense! In the past I had some trouble with Lexical HEEx formatting on VSCode. It didn't work reliably and some times introduced weird line breaks. I went back to ElixirLS until Expert is ready. But I may have to check out Lexical again.