ts-venue provides an example for usage of the ts-eventsourcing library.
After cloning this repo and running npm install, execute npm run lint && npm run build && npm run scenario.
Alternatively, you can also just execute npm run scenario after cloning and installing.
The console readout will show that two instances of VenueSeat were created, then the Venue to which they indirectly belong was changed by changing the accessible property of the second VenueSeat.
The changing of the seat's accessibility-status happens on the Venue itself, because it is the aggregate-root to which VenueSection belongs, which in turn owns the seats.
As the readout also shows, this automatically causes an update of the version property of the involved aggregates (seat, section and venue).