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diff --git a/web/core/modules/ckeditor/src/CKEditorPluginInterface.php b/web/core/modules/ckeditor/src/CKEditorPluginInterface.php
new file mode 100644
index 000000000..543a112df
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+++ b/web/core/modules/ckeditor/src/CKEditorPluginInterface.php
@@ -0,0 +1,99 @@
+<?php
+
+namespace Drupal\ckeditor;
+
+use Drupal\Component\Plugin\PluginInspectionInterface;
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Defines an interface for (loading of) CKEditor plugins.
+ *
+ * This is the most basic CKEditor plugin interface; it provides the bare
+ * minimum information. Solely implementing this interface is not sufficient to
+ * be able to enable the plugin though — a CKEditor plugin can either be enabled
+ * automatically when a button it provides is present in the toolbar, or when
+ * some programmatically defined condition is true. In the former case,
+ * implement the CKEditorPluginButtonsInterface interface, in the latter case,
+ * implement the CKEditorPluginContextualInterface interface. It is also
+ * possible to implement both, for advanced use cases.
+ *
+ * Finally, if your plugin must be configurable, you can also implement the
+ * CKEditorPluginConfigurableInterface interface.
+ *
+ * @see \Drupal\ckeditor\CKEditorPluginButtonsInterface
+ * @see \Drupal\ckeditor\CKEditorPluginContextualInterface
+ * @see \Drupal\ckeditor\CKEditorPluginConfigurableInterface
+ * @see \Drupal\ckeditor\CKEditorPluginCssInterface
+ * @see \Drupal\ckeditor\CKEditorPluginBase
+ * @see \Drupal\ckeditor\CKEditorPluginManager
+ * @see \Drupal\ckeditor\Annotation\CKEditorPlugin
+ * @see plugin_api
+ */
+interface CKEditorPluginInterface extends PluginInspectionInterface {
+
+  /**
+   * Indicates if this plugin is part of the optimized CKEditor build.
+   *
+   * Plugins marked as internal are implicitly loaded as part of CKEditor.
+   *
+   * @return bool
+   */
+  public function isInternal();
+
+  /**
+   * Returns a list of plugins this plugin requires.
+   *
+   * @param \Drupal\editor\Entity\Editor $editor
+   *   A configured text editor object.
+   * @return array
+   *   An unindexed array of plugin names this plugin requires. Each plugin is
+   *   is identified by its annotated ID.
+   */
+  public function getDependencies(Editor $editor);
+
+  /**
+   * Returns a list of libraries this plugin requires.
+   *
+   * These libraries will be attached to the text_format element on which the
+   * editor is being loaded.
+   *
+   * @param \Drupal\editor\Entity\Editor $editor
+   *   A configured text editor object.
+   * @return array
+   *   An array of libraries suitable for usage in a render API #attached
+   *   property.
+   */
+  public function getLibraries(Editor $editor);
+
+  /**
+   * Returns the Drupal root-relative file path to the plugin JavaScript file.
+   *
+   * Note: this does not use a Drupal library because this uses CKEditor's API,
+   * see http://docs.cksource.com/ckeditor_api/symbols/CKEDITOR.resourceManager.html#addExternal.
+   *
+   * @return string|false
+   *   The Drupal root-relative path to the file, FALSE if an internal plugin.
+   */
+  public function getFile();
+
+  /**
+   * Returns the additions to CKEDITOR.config for a specific CKEditor instance.
+   *
+   * The editor's settings can be retrieved via $editor->getSettings(), but be
+   * aware that it may not yet contain plugin-specific settings, because the
+   * user may not yet have configured the form.
+   * If there are plugin-specific settings (verify with isset()), they can be
+   * found at
+   * @code
+   * $settings = $editor->getSettings();
+   * $plugin_specific_settings = $settings['plugins'][$plugin_id];
+   * @endcode
+   *
+   * @param \Drupal\editor\Entity\Editor $editor
+   *   A configured text editor object.
+   * @return array
+   *   A keyed array, whose keys will end up as keys under CKEDITOR.config.
+   */
+  public function getConfig(Editor $editor);
+
+}