Remove all event listeners before disconnecting

Hi guys, I’ve been using lib-jitsi-meet low-level API for a while and it is working well.
However, recently, only I have realized that I didn’t properly remove the event listeners.
Previously, I thought just disconnect and set the conference object to null is enough

scope.conf.disconnect()
delete scope.conf

But we do need to call scope.conf.off(evt) or else there will be zombie listeners.
My question is whether we have a list of current listeners of a JitsiConference object ? Or we have to track manually outside it.

Thank you