on
fun WebApp.onEvent(type: EventType, eventHandler: EventHandler): () -> Unit
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fun WebApp.onEvent(type: EventType.ViewportChanged, eventHandler: ViewportChangedEventHandler): (ViewportChangedData) -> Unit
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fun WebApp.onEvent(type: EventType.InvoiceClosed, eventHandler: InvoiceClosedEventHandler): (InvoiceClosedInfo) -> Unit
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Return
The callback which should be used in case you want to turn off events handling