Group.php

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<?php
namespace Magento\Customer\Model\Customer\Source;

use Magento\Customer\Api\Data\GroupSearchResultsInterface;
use Magento\Framework\Module\Manager as ModuleManager;
use Magento\Customer\Api\Data\GroupInterface;
use Magento\Customer\Api\GroupRepositoryInterface;
use Magento\Framework\Api\SearchCriteriaBuilder;

class Group implements GroupSourceInterface
{
    protected $moduleManager;

    protected $groupRepository;

    protected $searchCriteriaBuilder;

    public function __construct(
        ModuleManager $moduleManager,
        GroupRepositoryInterface $groupRepository,
        SearchCriteriaBuilder $searchCriteriaBuilder
    ) {
        $this->moduleManager = $moduleManager;
        $this->groupRepository = $groupRepository;
        $this->searchCriteriaBuilder = $searchCriteriaBuilder;
    }

    public function toOptionArray()
    {
        if (!$this->moduleManager->isEnabled('Magento_Customer')) {
            return [];
        }
        $customerGroups = [];
        $customerGroups[] = [
            'label' => __('ALL GROUPS'),
            'value' => (string)GroupInterface::CUST_GROUP_ALL,
        ];

        $groups = $this->groupRepository->getList($this->searchCriteriaBuilder->create());
        foreach ($groups->getItems() as $group) {
            $customerGroups[] = [
                'label' => $group->getCode(),
                'value' => $group->getId(),
            ];
        }

        return $customerGroups;
    }
}