bool hasListeners(string $eventName = null) Checks whether an event has any registered listeners
array getListeners(string $eventName = null) Gets the listeners of a specific event or all listeners
addSubscriber(
GenericEvent setArguments(array
GenericEvent setArgument(string
Classes
stoppedPropagation()
Event dispatch(string $eventName,
addListener(string $eventName, callable $listener, int $priority) Adds an event listener that listens
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