The event is not cancelable.

The event does not have a result.

It might be required for you to import the package if you encounter any issues (like casting an Array), so better be safe than sorry and add the import at the very top of the file.

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import crafttweaker.api.event.MCEvent;

Cancels the event. Same as setCanceled(true)

Return Type: void

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MCEvent.cancel() as void
myMCEvent.cancel();

Return Type: boolean

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MCEvent.hasResult() as boolean
myMCEvent.hasResult();

Return Type: boolean

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MCEvent.isCancelable() as boolean
myMCEvent.isCancelable();

Return Type: boolean

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MCEvent.isCanceled() as boolean
myMCEvent.isCanceled();

sets the event's result to allow

Return Type: void

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MCEvent.setAllow() as void
myMCEvent.setAllow();

Return Type: void

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MCEvent.setCanceled(cancel as boolean) as void

sets the event's result to default

Return Type: void

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MCEvent.setDefault() as void
myMCEvent.setDefault();

sets the event's result to deny

Return Type: void

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MCEvent.setDeny() as void
myMCEvent.setDeny();