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diff --git a/vendor/consolidation/output-formatters/src/StructuredData/AbstractListData.php b/vendor/consolidation/output-formatters/src/StructuredData/AbstractListData.php
new file mode 100644
index 000000000..7c635dbba
--- /dev/null
+++ b/vendor/consolidation/output-formatters/src/StructuredData/AbstractListData.php
@@ -0,0 +1,61 @@
+<?php
+namespace Consolidation\OutputFormatters\StructuredData;
+
+use Consolidation\OutputFormatters\Options\FormatterOptions;
+use Consolidation\OutputFormatters\Transformations\ReorderFields;
+
+/**
+ * Base class for all list data types.
+ */
+class AbstractListData extends \ArrayObject implements ListDataInterface
+{
+    public function __construct($data)
+    {
+        parent::__construct($data);
+    }
+
+    public function getListData(FormatterOptions $options)
+    {
+        return array_keys($this->getArrayCopy());
+    }
+
+    protected function getReorderedFieldLabels($data, $options, $defaults)
+    {
+        $reorderer = new ReorderFields();
+        $fieldLabels = $reorderer->reorder(
+            $this->getFields($options, $defaults),
+            $options->get(FormatterOptions::FIELD_LABELS, $defaults),
+            $data
+        );
+        return $fieldLabels;
+    }
+
+    protected function getFields($options, $defaults)
+    {
+        $fieldShortcut = $options->get(FormatterOptions::FIELD);
+        if (!empty($fieldShortcut)) {
+            return [$fieldShortcut];
+        }
+        $result = $options->get(FormatterOptions::FIELDS, $defaults);
+        if (!empty($result)) {
+            return $result;
+        }
+        return $options->get(FormatterOptions::DEFAULT_FIELDS, $defaults);
+    }
+
+    /**
+     * A structured list may provide its own set of default options. These
+     * will be used in place of the command's default options (from the
+     * annotations) in instances where the user does not provide the options
+     * explicitly (on the commandline) or implicitly (via a configuration file).
+     *
+     * @return array
+     */
+    protected function defaultOptions()
+    {
+        return [
+            FormatterOptions::FIELDS => [],
+            FormatterOptions::FIELD_LABELS => [],
+        ];
+    }
+}