You might want to read the upgrade guide or the documentation for Livewire v3 events, the method has been changed from emit and dispatchBrowserEvent to dispatch:
No, not specifically. V2 livewire allowed us to use $this->emit('refresh'); and tie it to a listener in order to refresh the component. It was convienient.
V3 seems to be using $this->dispatch('refresh');, but I'm not sure how the component is refreshed?
@AtomCoder dispatching just dispatches a generic event, in your case, one called refresh. It's up to you to write the logic to do whatever you need it to do (in this case, perform some kind of refresh, I assume).