Update Composer, update everything

web/core/modules/book/book.es6.js

@@ -0,0 +1,34 @@
+/**
+ * @file
+ * Javascript behaviors for the Book module.
+ */
+
+(function($, Drupal) {
+  /**
+   * Adds summaries to the book outline form.
+   *
+   * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches summary behavior to book outline forms.
+   */
+  Drupal.behaviors.bookDetailsSummaries = {
+    attach(context) {
+      $(context)
+        .find('.book-outline-form')
+        .drupalSetSummary(context => {
+          const $select = $(context).find('.book-title-select');
+          const val = $select.val();
+
+          if (val === '0') {
+            return Drupal.t('Not in book');
+          }
+          if (val === 'new') {
+            return Drupal.t('New book');
+          }
+
+          return Drupal.checkPlain($select.find(':selected').text());
+        });
+    },
+  };
+})(jQuery, Drupal);