once
external fun <T> once(event: EventName, handler: EventCallback<T>, options: Options = definedExternally): Promise<UnlistenFn>(source)
Listens once to an emitted event to any {@link EventTarget|target}.
Since
1.0.0
Parameters
event
Event name. Must include only alphanumeric characters, -, /, : and _.
handler
Event handler callback.
options
Event listening options.