public function toOptionArray()
 {
     $arr = [];
     $carriers = $this->shippingConfig->getAllCarriers($this->storeManager->getStore());
     foreach ($carriers as $carrierCode => $carrierModel) {
         $carrierTitle = $this->shipperDataHelper->getConfigValue('carriers/' . $carrierCode . '/title');
         if (strpos($carrierCode, 'shipper') === 0 || $carrierTitle == '') {
             continue;
         }
         if ($this->shipperDataHelper->getConfigValue('carriers/' . $carrierCode . '/model') == 'ShipperHQ\\Shipper\\Model\\Carrier\\Shipper') {
             continue;
         }
         $arr[] = ['value' => $carrierCode, 'label' => $carrierTitle];
     }
     array_unshift($arr, ['value' => false, 'label' => __('No Carrier')]);
     return $arr;
 }
 /**
  * Return array of carriers.
  * If $isActiveOnlyFlag is set to true, will return only active carriers
  *
  * @param bool $isActiveOnlyFlag
  * @return array
  */
 public function toOptionArray($isActiveOnlyFlag = false)
 {
     $methods = [['value' => '', 'label' => '']];
     $carriers = $this->_shippingConfig->getAllCarriers();
     foreach ($carriers as $carrierCode => $carrierModel) {
         if (!$carrierModel->isActive() && (bool) $isActiveOnlyFlag === true) {
             continue;
         }
         $carrierMethods = $carrierModel->getAllowedMethods();
         if (!$carrierMethods) {
             continue;
         }
         $carrierTitle = $this->_scopeConfig->getValue('carriers/' . $carrierCode . '/title', \Magento\Store\Model\ScopeInterface::SCOPE_STORE);
         $methods[$carrierCode] = ['label' => $carrierTitle, 'value' => []];
         foreach ($carrierMethods as $methodCode => $methodTitle) {
             $methods[$carrierCode]['value'][] = ['value' => $carrierCode . '_' . $methodCode, 'label' => '[' . $carrierCode . '] ' . $methodTitle];
         }
     }
     return $methods;
 }
 /**
  * @return array
  */
 protected function _getCarriersInstances()
 {
     return $this->_shippingConfig->getAllCarriers($this->getShipment()->getStoreId());
 }
 /**
  * Returns active carriers codes
  * @return array
  */
 private function getActiveCarriers()
 {
     $activeCarriers = [];
     foreach ($this->shippingMethodConfig->getActiveCarriers() as $carrier) {
         $activeCarriers[] = $carrier->getCarrierCode();
     }
     return $activeCarriers;
 }