Provider.php

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<?php
namespace Magento\Tax\Model\Rate;

use Magento\Framework\Convert\DataObject as Converter;
use Magento\Tax\Api\TaxRateRepositoryInterface;
use Magento\Framework\Api\SearchCriteriaInterface;
use Magento\Tax\Model\Calculation\Rate;

class Provider
{
    private $taxRateRepository;

    private $converter;

    private $pageSize = 100;

    public function __construct(
        TaxRateRepositoryInterface $taxRateRepository,
        Converter $converter
    ) {
        $this->taxRateRepository = $taxRateRepository;
        $this->converter = $converter;
    }

    public function toOptionArray(SearchCriteriaInterface $searchCriteria)
    {
        $searchResults = $this->taxRateRepository->getList($searchCriteria);

        return $this->converter->toOptionArray(
            $searchResults->getItems(),
            Rate::KEY_ID,
            Rate::KEY_CODE
        );
    }

    public function getPageSize()
    {
        return (int) $this->pageSize;
    }
}