Class EventEmitter<E>

Alias for emitter.on(eventName, listener).

Since

2.0.0

Returns the number of listeners listening to the event named eventName.

Since

2.0.0

Removes the all specified listener from the listener array for the event eventName Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Adds the listener function to the end of the listeners array for the event named eventName. No checks are made to see if the listener has already been added. Multiple calls passing the same combination of eventNameand listener will result in the listener being added, and called, multiple times.

Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Adds a one-timelistener function for the event named eventName. The next time eventName is triggered, this listener is removed and then invoked.

Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Adds the listener function to the beginning of the listeners array for the event named eventName. No checks are made to see if the listener has already been added. Multiple calls passing the same combination of eventNameand listener will result in the listener being added, and called, multiple times.

Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Adds a one-timelistener function for the event named eventName to the_beginning_ of the listeners array. The next time eventName is triggered, this listener is removed, and then invoked.

Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Removes all listeners, or those of the specified eventName.

Returns a reference to the EventEmitter, so that calls can be chained.

Since

2.0.0

Alias for emitter.off(eventName, listener).

Since

2.0.0