Optional
$destroyReadonly
gatheringReadonly
stateOptional
options: boolean | AddEventListenerOptionsOptional
options: boolean | AddEventListenerOptionsDispatches a synthetic event event to target and returns true if either event's cancelable attribute value is false or its preventDefault() method was not invoked, and false otherwise.
Optional
options: boolean | EventListenerOptionsOptional
options: boolean | EventListenerOptions
Provides access to information about the ICE transport layer over which the data is being sent and received.
MDN Reference