Emitted when the listener reconnects and successfully resumes from
its previous position.
Even if the listener is created with enableResume: true, resume support
may not be available. In that case, a reconnect will emit welcome
instead of welcomeback.
If resumability is unavailable, even listeners created with enableResume: true may still
emit welcome when reconnected. Subscribers should therefore treat welcome after a reconnect
the same way they would otherwise treat a reset event.
Emitted when the listener reconnects and successfully resumes from its previous position.
Even if the listener is created with
enableResume: true, resume support may not be available. In that case, a reconnect will emitwelcomeinstead ofwelcomeback.If resumability is unavailable, even listeners created with
enableResume: truemay still emitwelcomewhen reconnected. Subscribers should therefore treatwelcomeafter a reconnect the same way they would otherwise treat aresetevent.