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diff --git a/web/modules/contrib/libraries/src/ExternalLibrary/LibraryBase.php b/web/modules/contrib/libraries/src/ExternalLibrary/LibraryBase.php
new file mode 100644
index 000000000..8571552c7
--- /dev/null
+++ b/web/modules/contrib/libraries/src/ExternalLibrary/LibraryBase.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Drupal\libraries\ExternalLibrary;
+
+use Drupal\libraries\ExternalLibrary\Dependency\DependentLibraryInterface;
+use Drupal\libraries\ExternalLibrary\Dependency\DependentLibraryTrait;
+use Drupal\libraries\ExternalLibrary\Type\LibraryTypeInterface;
+use Drupal\libraries\ExternalLibrary\Utility\IdAccessorTrait;
+use Drupal\libraries\ExternalLibrary\Version\VersionedLibraryInterface;
+use Drupal\libraries\ExternalLibrary\Version\VersionedLibraryTrait;
+
+/**
+ * Provides a base external library implementation.
+ */
+abstract class LibraryBase implements
+  LibraryInterface,
+  DependentLibraryInterface,
+  VersionedLibraryInterface
+{
+
+  use
+    IdAccessorTrait,
+    DependentLibraryTrait,
+    VersionedLibraryTrait
+  ;
+
+  /**
+   * The library type of this library.
+   *
+   * @var \Drupal\libraries\ExternalLibrary\Type\LibraryTypeInterface
+   */
+  protected $type;
+
+  /**
+   * Constructs a library.
+   *
+   * @param string $id
+   *   The library ID.
+   * @param array $definition
+   *   The library definition array.
+   * @param \Drupal\libraries\ExternalLibrary\Type\LibraryTypeInterface $type
+   *   The library type of this library.
+   */
+  public function __construct($id, array $definition, LibraryTypeInterface $type) {
+    $this->id = (string) $id;
+    $this->type = $type;
+    $this->dependencies = $definition['dependencies'];
+    $this->versionDetector = $definition['version_detector'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create($id, array $definition, LibraryTypeInterface $type) {
+    static::processDefinition($definition);
+    return new static($id, $definition, $type);
+  }
+
+  /**
+   * Gets library definition defaults.
+   *
+   * @param array $definition
+   *   A library definition array.
+   */
+  protected static function processDefinition(array &$definition) {
+    $definition += [
+      'dependencies' => [],
+      // @todo This fallback is not very elegant.
+      'version_detector' => [
+        'id' => 'static',
+        'configuration' => ['version' => ''],
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getType() {
+    return $this->type;
+  }
+
+}