addListener(string $eventName, callable $listener, int $priority) Adds an event listener that listens
int|null getListenerPriority(string $eventName, callable $listener) Gets the listener priority
bool hasListeners(string $eventName = null) Checks whether an event has any registered listeners
addSubscriberService(string $serviceId, string $class) Adds a service as event subscriber.
removeListener(string $eventName, callable $listener) Removes an event listener from the specified
removeSubscriber(
class ImmutableEventDispatcher implements
addSubscriber(
bool offsetExists(string $key) ArrayAccess has argument.
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