Clean up 'isset' coding style

app/code/Magento/Bundle/Helper/Data.php

@@ -38,6 +38,6 @@ public function getAllowedSelectionTypes()
     {
         $configData = $this->config->getType(\Magento\Catalog\Model\Product\Type::TYPE_BUNDLE);
 
-        return isset($configData['allowed_selection_types']) ? $configData['allowed_selection_types'] : [];
+        return $configData['allowed_selection_types'] ?? [];
     }
 }

app/code/Magento/Catalog/Block/Adminhtml/Product/Edit/Tab/Price/Group/AbstractGroup.php

@@ -212,7 +212,7 @@ public function getCustomerGroups($groupId = null)
         }
 
         if ($groupId !== null) {
-            return isset($this->_customerGroups[$groupId]) ? $this->_customerGroups[$groupId] : [];
+            return $this->_customerGroups[$groupId] ?? [];
         }
 
         return $this->_customerGroups;

app/code/Magento/Catalog/Model/Product/Attribute/Source/Status.php

@@ -37,8 +37,7 @@ public function getVisibleStatusIds()
     }
 
     /**
-     * Retrieve Saleable Status Ids
-     * Default Product Enable status
+     * Retrieve Saleable Status Ids, default Product Enable status
      *
      * @return int[]
      */
@@ -51,6 +50,7 @@ public function getSaleableStatusIds()
      * Retrieve option array
      *
      * @return string[]
+     * phpcs:disable Magento2.Functions.StaticFunction
      */
     public static function getOptionArray()
     {
@@ -83,7 +83,7 @@ public function getOptionText($optionId)
     {
         $options = self::getOptionArray();
 
-        return isset($options[$optionId]) ? $options[$optionId] : null;
+        return $options[$optionId] ?? null;
     }
 
     /**

app/code/Magento/Catalog/Model/Product/Gallery/EntryResolver.php

@@ -9,6 +9,9 @@
 
 use Magento\Catalog\Model\Product;
 
+/**
+ * Manage entryes
+ */
 class EntryResolver
 {
     /**
@@ -27,7 +30,7 @@ public function getEntryFilePathById(Product $product, $entryId)
 
         foreach ($mediaGalleryData['images'] as $image) {
             if (isset($image['value_id']) && $image['value_id'] == $entryId) {
-                return isset($image['file']) ? $image['file'] : null;
+                return $image['file'] ?? null;
             }
         }
         return null;
@@ -49,7 +52,7 @@ public function getEntryIdByFilePath(Product $product, $filePath)
 
         foreach ($mediaGalleryData['images'] as $image) {
             if (isset($image['file']) && $image['file'] == $filePath) {
-                return isset($image['value_id']) ? $image['value_id'] : null;
+                return $image['value_id'] ?? null;
             }
         }
         return null;

app/code/Magento/Catalog/Model/Product/Visibility.php

@@ -133,7 +133,7 @@ public static function getAllOptions()
     public static function getOptionText($optionId)
     {
         $options = self::getOptionArray();
-        return isset($options[$optionId]) ? $options[$optionId] : null;
+        return $options[$optionId] ?? null;
     }
     //phpcs:enable Magento2.Functions.StaticFunction
 

app/code/Magento/Catalog/Model/ProductLink/Converter/ConverterPool.php

@@ -6,6 +6,9 @@
 
 namespace Magento\Catalog\Model\ProductLink\Converter;
 
+/**
+ * Return converter by link type
+ */
 class ConverterPool
 {
     /**
@@ -34,8 +37,6 @@ public function __construct(array $converters)
      */
     public function getConverter($linkType)
     {
-        return isset($this->converters[$linkType])
-            ? $this->converters[$linkType]
-            : $this->converters[$this->defaultConverterCode];
+        return $this->converters[$linkType] ?? $this->converters[$this->defaultConverterCode];
     }
 }

app/code/Magento/Catalog/Model/ProductLink/Link.php

@@ -7,6 +7,8 @@
 namespace Magento\Catalog\Model\ProductLink;
 
 /**
+ * @inheritdoc
+ *
  * @codeCoverageIgnore
  */
 class Link extends \Magento\Framework\Model\AbstractExtensibleModel implements
@@ -30,17 +32,19 @@ class Link extends \Magento\Framework\Model\AbstractExtensibleModel implements
      */
     protected function _get($key)
     {
-        return isset($this->_data[$key]) ? $this->_data[$key] : null;
+        return $this->_data[$key] ?? null;
     }
 
     /**
      * Return Data Object data in array format.
      *
      * @return array
      * @todo refactor with converter for AbstractExtensibleModel
+     * phpcs:disable
      */
     public function __toArray()
     {
+     //phpcs:enable
         $data = $this->_data;
         $hasToArray = function ($model) {
             return is_object($model) && method_exists($model, '__toArray') && is_callable([$model, '__toArray']);
@@ -169,7 +173,7 @@ public function setPosition($position)
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      *
      * @return \Magento\Catalog\Api\Data\ProductLinkExtensionInterface|null
      */
@@ -184,7 +188,7 @@ public function getExtensionAttributes()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      *
      * @param \Magento\Catalog\Api\Data\ProductLinkExtensionInterface $extensionAttributes
      * @return $this

app/code/Magento/Checkout/Block/Checkout/AttributeMerger.php

@@ -289,6 +289,7 @@ protected function getMultilineFieldConfig($attributeCode, array $attributeConfi
                 'dataScope' => $lineIndex,
                 'provider' => $providerName,
                 'validation' => $isFirstLine
+                //phpcs:ignore Magento2.Performance.ForeachArrayMerge
                     ? array_merge(
                         ['required-entry' => (bool)$attributeConfig['required']],
                         $attributeConfig['validation']
@@ -381,14 +382,14 @@ protected function getCustomer(): ?CustomerInterface
     /**
      * Retrieve field options from attribute configuration
      *
-     * @param string $attributeCode
+     * @param mixed $attributeCode
      * @param array $attributeConfig
      * @return array
      * @SuppressWarnings(PHPMD.UnusedFormalParameter)
      */
     protected function getFieldOptions($attributeCode, array $attributeConfig)
     {
-        return isset($attributeConfig['options']) ? $attributeConfig['options'] : [];
+        return $attributeConfig['options'] ?? [];
     }
 
     /**

app/code/Magento/Config/Model/Config/Structure/AbstractElement.php

@@ -103,7 +103,7 @@ public function getData()
      */
     public function getId()
     {
-        return isset($this->_data['id']) ? $this->_data['id'] : '';
+        return $this->_data['id'] ?? '';
     }
 
     /**
@@ -133,7 +133,7 @@ public function getComment()
      */
     public function getFrontendModel()
     {
-        return isset($this->_data['frontend_model']) ? $this->_data['frontend_model'] : '';
+        return $this->_data['frontend_model'] ?? '';
     }
 
     /**
@@ -194,7 +194,7 @@ protected function _hasVisibilityValue($key)
      */
     public function getClass()
     {
-        return isset($this->_data['class']) ? $this->_data['class'] : '';
+        return $this->_data['class'] ?? '';
     }
 
     /**

app/code/Magento/Config/Model/Config/Structure/Element/Field.php

@@ -150,7 +150,7 @@ public function getTooltip()
      */
     public function getType()
     {
-        return isset($this->_data['type']) ? $this->_data['type'] : 'text';
+        return $this->_data['type'] ?? 'text';
     }
 
     /**
@@ -204,7 +204,7 @@ public function getRequiredFields($fieldPrefix = '')
      */
     public function getFrontendClass()
     {
-        return isset($this->_data['frontend_class']) ? $this->_data['frontend_class'] : '';
+        return $this->_data['frontend_class'] ?? '';
     }
 
     /**
@@ -256,7 +256,7 @@ public function getGroupPath()
      */
     public function getConfigPath()
     {
-        return isset($this->_data['config_path']) ? $this->_data['config_path'] : null;
+        return $this->_data['config_path'] ?? null;
     }
 
     /**
@@ -334,7 +334,7 @@ public function hasValidation()
      */
     public function getValidation()
     {
-        return isset($this->_data['validate']) ? $this->_data['validate'] : null;
+        return $this->_data['validate'] ?? null;
     }
 
     /**

app/code/Magento/Config/Model/Config/Structure/Element/Section.php

@@ -6,7 +6,7 @@
 namespace Magento\Config\Model\Config\Structure\Element;
 
 /**
- * Section
+ * Element section
  *
  * @api
  * @since 100.0.2
@@ -43,7 +43,7 @@ public function __construct(
      */
     public function getHeaderCss()
     {
-        return isset($this->_data['header_css']) ? $this->_data['header_css'] : '';
+        return $this->_data['header_css'] ?? '';
     }
 
     /**

app/code/Magento/Customer/Ui/Component/ColumnFactory.php

@@ -130,8 +130,6 @@ protected function getJsComponent($dataType)
      */
     protected function getDataType($frontendType)
     {
-        return isset($this->dataTypeMap[$frontendType])
-            ? $this->dataTypeMap[$frontendType]
-            : $this->dataTypeMap['default'];
+        return $this->dataTypeMap[$frontendType] ?? $this->dataTypeMap['default'];
     }
 }

app/code/Magento/Customer/Ui/Component/FilterFactory.php

@@ -76,6 +76,6 @@ public function create(array $attributeData, $context)
      */
     protected function getFilterType($frontendInput)
     {
-        return isset($this->filterMap[$frontendInput]) ? $this->filterMap[$frontendInput] : $this->filterMap['default'];
+        return $this->filterMap[$frontendInput] ?? $this->filterMap['default'];
     }
 }

app/code/Magento/Customer/Ui/Component/Listing/AttributeRepository.php

@@ -14,7 +14,7 @@
 use Magento\Customer\Model\Indexer\Attribute\Filter;
 
 /**
- * Class AttributeRepository
+ * Attribute Repository Managment
  */
 class AttributeRepository
 {
@@ -156,10 +156,10 @@ protected function getOptionArray(array $options)
      * Return customer group's metadata by given group code
      *
      * @param string $code
-     * @return []
+     * @return array | null
      */
     public function getMetadataByCode($code)
     {
-        return isset($this->getList()[$code]) ? $this->getList()[$code] : null;
+        return $this->getList()[$code] ?? null;
     }
 }

app/code/Magento/Customer/Ui/Component/Listing/Column/ValidationRules.php

@@ -63,9 +63,7 @@ public function getValidationRules($isRequired, $validationRules)
     protected function getValidationClass(ValidationRuleInterface $rule)
     {
         $key = $rule->getName() == 'input_validation' ? $rule->getValue() : $rule->getName();
-        return isset($this->inputValidationMap[$key])
-            ? $this->inputValidationMap[$key]
-            : $key;
+        return $this->inputValidationMap[$key] ?? $key;
     }
 
     /**

app/code/Magento/Customer/Ui/Component/Listing/Columns.php

@@ -12,6 +12,9 @@
 use Magento\Customer\Ui\Component\Listing\Column\InlineEditUpdater;
 use Magento\Customer\Api\CustomerMetadataInterface;
 
+/**
+ * Columns component
+ */
 class Columns extends \Magento\Ui\Component\Listing\Columns
 {
     /**
@@ -29,6 +32,11 @@ class Columns extends \Magento\Ui\Component\Listing\Columns
      */
     protected $inlineEditUpdater;
 
+    /**
+     * @var ColumnFactory
+     */
+    private $columnFactory;
+
     /**
      * @var array
      */
@@ -63,6 +71,8 @@ public function __construct(
     }
 
     /**
+     * Return default sort order
+     *
      * @return int
      */
     protected function getDefaultSortOrder()
@@ -94,7 +104,7 @@ protected function updateActionColumnSortOrder()
     }
 
     /**
-     * {@inheritdoc}
+     * @inheritdoc
      */
     public function prepare()
     {
@@ -113,6 +123,8 @@ public function prepare()
     }
 
     /**
+     * Add column to the component
+     *
      * @param array $attributeData
      * @param string $columnName
      * @return void
@@ -129,6 +141,8 @@ public function addColumn(array $attributeData, $columnName)
     }
 
     /**
+     * Update column in component
+     *
      * @param array $attributeData
      * @param string $newAttributeCode
      * @return void
@@ -200,6 +214,6 @@ public function addOptions(UiComponentInterface $component, array $attributeData
      */
     protected function getFilterType($frontendInput)
     {
-        return isset($this->filterMap[$frontendInput]) ? $this->filterMap[$frontendInput] : $this->filterMap['default'];
+        return $this->filterMap[$frontendInput] ?? $this->filterMap['default'];
     }
 }

app/code/Magento/Deploy/Model/Mode.php

@@ -205,7 +205,7 @@ public function enableDefaultMode()
     public function getMode()
     {
         $env = $this->reader->load();
-        return isset($env[State::PARAM_MODE]) ? $env[State::PARAM_MODE] : null;
+        return $env[State::PARAM_MODE] ?? null;
     }
 
     /**

app/code/Magento/Deploy/Package/Package.php

@@ -219,7 +219,7 @@ public function isVirtual()
      */
     public function getParam($name)
     {
-        return isset($this->params[$name]) ? $this->params[$name] : null;
+        return $this->params[$name] ?? null;
     }
 
     /**
@@ -253,7 +253,7 @@ public function getThemeModel()
      */
     public function getFile($fileId)
     {
-        return isset($this->files[$fileId]) ? $this->files[$fileId] : false;
+        return $this->files[$fileId] ?? false;
     }
 
     /**