CustomerGroupsOptionsProvider.php

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<?php
namespace Magento\CatalogRule\Model\Rule;

class CustomerGroupsOptionsProvider implements \Magento\Framework\Data\OptionSourceInterface
{
    private $groupRepository;

    private $searchCriteriaBuilder;

    private $objectConverter;

    public function __construct(
        \Magento\Customer\Api\GroupRepositoryInterface $groupRepository,
        \Magento\Framework\Api\SearchCriteriaBuilder $searchCriteriaBuilder,
        \Magento\Framework\Convert\DataObject $objectConverter
    ) {
        $this->groupRepository = $groupRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
        $this->objectConverter = $objectConverter;
    }

    public function toOptionArray()
    {
        $customerGroups = $this->groupRepository->getList($this->searchCriteriaBuilder->create())->getItems();
        return $this->objectConverter->toOptionArray($customerGroups, 'id', 'code');
    }
}