Generic.php

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

use Magento\Shipping\Model\Carrier\Source\GenericInterface;
use Magento\Usps\Model\Carrier;

class Generic implements GenericInterface
{
    protected $shippingUsps;

    protected $code = '';

    public function __construct(Carrier $shippingUsps)
    {
        $this->shippingUsps = $shippingUsps;
    }

    public function toOptionArray()
    {
        $options = [];
        $codes = $this->shippingUsps->getCode($this->code);
        if ($codes) {
            foreach ($codes as $code => $title) {
                $options[] = ['value' => $code, 'label' => __($title)];
            }
        }
        return $options;
    }
}