upgrades core to 8.4.2

core/misc/batch.es6.js

@@ -0,0 +1,42 @@
+/**
+ * @file
+ * Drupal's batch API.
+ */
+
+(function ($, Drupal) {
+  /**
+   * Attaches the batch behavior to progress bars.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.batch = {
+    attach(context, settings) {
+      const batch = settings.batch;
+      const $progress = $('[data-drupal-progress]').once('batch');
+      let progressBar;
+
+      // Success: redirect to the summary.
+      function updateCallback(progress, status, pb) {
+        if (progress === '100') {
+          pb.stopMonitoring();
+          window.location = `${batch.uri}&op=finished`;
+        }
+      }
+
+      function errorCallback(pb) {
+        $progress.prepend($('<p class="error"></p>').html(batch.errorMessage));
+        $('#wait').hide();
+      }
+
+      if ($progress.length) {
+        progressBar = new Drupal.ProgressBar('updateprogress', updateCallback, 'POST', errorCallback);
+        progressBar.setProgress(-1, batch.initMessage);
+        progressBar.startMonitoring(`${batch.uri}&op=do`, 10);
+        // Remove HTML from no-js progress bar.
+        $progress.empty();
+        // Append the JS progressbar element.
+        $progress.append(progressBar.element);
+      }
+    },
+  };
+}(jQuery, Drupal));