I would like to know how to open an alert window when saving a file

파일 저장시 alert창을 띄우기 위한 방법을 알고 싶습니다
I would like to know how to open an alert window when saving a file

혹시 어떻게 해야하는지 알려주실 수 있으신가요?
Could you please tell me how to do it?

@ejrtn There is a Signal that you can attach a handler to. Do you still need help with this?

You can see an example of doing that here: etc_jupyterlab_telemetry_library/events.ts at 091f8fef853fc6cb7077d7d0790f509e2d65f709 · educational-technology-collective/etc_jupyterlab_telemetry_library · GitHub