EventConverter::prepareRecurrenceRule

private function prepareRecurrenceRule(): array
{
	$rule = [];

	if (!$this->originalEvent->isRecurrence())
	{
		return [];
	}

	$rule[] = $this->prepareDescriptionRecurrenceRule();

	if ($this->originalEvent->getExcludedDateCollection() !== null)
	{
		array_push($rule, ...$this->prepareExcludedDates());
	}

	return $rule;
}