A helper to avoid exposing undesirable events.
Dispatches an event, calling all listeners.
the argument to call listeners with.
Subscribes to the event only once.
The listener which will be called when the event is dispatched.
Subscribe to the event.
The listener which will be called when the event is dispatched.
Unsubscribe from the event.
The listener to remove.
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An event which can be subscribed to and dispatched