diff -u b/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
--- b/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -95,7 +95,7 @@
  *       'full' or 'teaser'.
  *   - attributes: HTML attributes for the containing element.
  */
-function template_preprocess_taxonomy_term(&$variables) {
+function template_preprocess_taxonomy_term(array &$variables) {
   $variables['view_mode'] = $variables['elements']['#view_mode'];
   $variables['term'] = $variables['elements']['#taxonomy_term'];
   /** @var \Drupal\taxonomy\TermInterface $term */
@@ -192,7 +192,7 @@
  * @param \Drupal\node\Entity\Node $node
  *   The node entity.
  */
-function taxonomy_build_node_index($node) {
+function taxonomy_build_node_index(Node $node) {
   // We maintain a denormalized table of term/node relationships, containing
   // only data for current, published nodes.
   if (!\Drupal::config('taxonomy.settings')->get('maintain_index_table') || !(\Drupal::entityTypeManager()->getStorage('node') instanceof SqlContentEntityStorage)) {
@@ -228,7 +228,7 @@
             'nid' => $node->id(),
             'tid' => $tid,
             'status' => (int) $node->getTranslation($langcode)->isPublished(),
-            'langcode' => $langcode
+            'langcode' => $langcode,
           ])
           ->fields(['sticky' => $sticky, 'created' => $node->getCreatedTime()])
           ->execute();
diff -u b/core/modules/taxonomy/taxonomy.post_update.php b/core/modules/taxonomy/taxonomy.post_update.php
--- b/core/modules/taxonomy/taxonomy.post_update.php
+++ b/core/modules/taxonomy/taxonomy.post_update.php
@@ -23,8 +23,8 @@
 }
 
 /**
-+ * Populate taxonomy index new langcode column.
-+ */
+ * Populate taxonomy index new langcode column.
+ */
 function taxonomy_post_update_populate_taxonomy_index_langcode(&$sandbox = NULL) {
   /** @var \Drupal\node\NodeStorageInterface $node_storage */
   $node_storage = \Drupal::entityTypeManager()->getStorage('node');
@@ -49,12 +49,12 @@
 
   // Retrieve the next group.
   $entity_ids = $database->select('taxonomy_index')
-      ->fields('taxonomy_index', ['nid'])
-      ->orderBy('nid')
-      ->distinct()
-      ->range($sandbox['progress'], $sandbox['limit'])
-      ->execute()
-      ->fetchCol();
+    ->fields('taxonomy_index', ['nid'])
+    ->orderBy('nid')
+    ->distinct()
+    ->range($sandbox['progress'], $sandbox['limit'])
+    ->execute()
+    ->fetchCol();
   $nodes = $node_storage->loadMultiple($entity_ids);
 
   foreach ($nodes as $node) {