IDX now has project-specific .idx/dev.nix file, which configures the project-specific environment.

I'd like to have a user-specific user.nix (or similar) file which would be applied on all of my own workspaces, which would not be shared to other people using my project.

Use case: I author an open source project, which needs project level dependencies. These I'd put to .idx/dev.nix. I also have a ton of terminal and git aliases and configs that I'd like to have on my own projects, but which don't make sense in the context of my open source project.