Direnv does not work if shell initializes tmux

[musjj]

I have a line in my config that initializes a tmux session when my shell loads:

exec tmux new-session -A -s "$USER"

But unfortunately this apparently interferes with the direnv loading process, causing the following error:

2025-05-04T07:25:30+00:00 ERROR [project::environment] login shell exited with exit status: 1
2025-05-04T07:25:30+00:00 ERROR [project::environment] Login shell exited with nonzero exit code. See logs for details

Removing the line initializing the tmux session allows direnv to work again. Is there a way to detect when the shell is being run by zed's direnv process, so that I can selectively skip tmux?

I still want tmux to initialize in zed's actual terminal pane, so hopefully there's a way to distinguish between the two.

[musjj]

Figured out a good solution, you can check if the shell is connected to a terminal before executing tmux:

if tty -s; then
  exec tmux new-session -A -s "$USER"
fi

This way tmux will still load in zed's terminal pane.