An object which enables subscribing and unsubscribing from an event without exposing methods to fire the event.
Subscribes to the event with a listener which will only be called once.
The listener which will be added.
Subscribe to the event.
Unsubscribes from the event.
The listener which will be removed.
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An object which enables subscribing and unsubscribing from an event without exposing methods to fire the event.