listenerCount()

Returns the number of listeners registered for a given event, or the total number of listeners across all events when called without an argument.

Example

const count = instance.listenerCount("foo");
// count: 2

const total = instance.listenerCount();
// total: 5

Parameters

Parameter	Type	Description
event	string | symbol	(Optional) The event name. Expects an ESMitterEventName. When omitted, the total listener count across all events is returned.

Returns

Type	Description
number	The number of listeners registered for the event, or the total across all events if no argument is given.

Notes

• If no listeners are registered for the event, 0 is returned.
• When called without an argument, 0 is returned if no listeners are registered for any event.