interface CKEditorPluginConfigurableInterface

interface CKEditorPluginConfigurableInterface extends CKEditorPluginInterface {
    
    /**
     * Returns a settings form to configure this CKEditor plugin.
     *
     * If the plugin's behavior depends on extensive options and/or external data,
     * then the implementing module can choose to provide a separate, global
     * configuration page rather than per-text-editor settings. In that case, this
     * form should provide a link to the separate settings page.
     *
     * @param array $form
     *   An empty form array to be populated with a configuration form, if any.
     * @param \Drupal\Core\Form\FormStateInterface $form_state
     *   The state of the entire filter administration form.
     * @param \Drupal\editor\Entity\Editor $editor
     *   A configured text editor object.
     *
     * @return array
     *   A render array for the settings form.
     */
    public function settingsForm(array $form, FormStateInterface $form_state, Editor $editor);

}