diff --git a/core/modules/content_translation/content_translation.module b/core/modules/content_translation/content_translation.module
index 20d72ed..4a62081 100644
--- a/core/modules/content_translation/content_translation.module
+++ b/core/modules/content_translation/content_translation.module
@@ -600,7 +600,7 @@ function content_translation_form_alter(array &$form, array &$form_state) {
     if (!$entity->isNew() && (!isset($translations[$form_langcode]) || count($translations) > 1)) {
       foreach ($entity->getPropertyDefinitions() as $property_name => $definition) {
         if (isset($form[$property_name])) {
-          $form[$property_name]['#multilingual'] = !empty($definition['translatable']);
+          $form[$property_name]['#multilingual'] = $definition->isFieldTranslatable();
         }
       }
     }
diff --git a/core/modules/field/field.deprecated.inc b/core/modules/field/field.deprecated.inc
index 6f4a643..100a60e 100644
--- a/core/modules/field/field.deprecated.inc
+++ b/core/modules/field/field.deprecated.inc
@@ -615,7 +615,7 @@ function field_attach_form_validate(ContentEntityInterface $entity, $form, &$for
   $has_violations = FALSE;
   foreach ($entity as $field_name => $field) {
     $definition = $field->getDefinition();
-    if (!empty($definition['configurable']) && (empty($options['field_name']) || $options['field_name'] == $field_name)) {
+    if ($definition->isFieldConfigurable() && (empty($options['field_name']) || $options['field_name'] == $field_name)) {
       $field_violations = $field->validate();
       if (count($field_violations)) {
         $has_violations = TRUE;
diff --git a/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php b/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
index 93821ef..7df8d2c 100644
--- a/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
+++ b/core/modules/field/lib/Drupal/field/Entity/FieldInstance.php
@@ -12,6 +12,7 @@
 use Drupal\Core\Annotation\Translation;
 use Drupal\Core\Config\Entity\ConfigEntityBase;
 use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\TypedData\DataDefinition;
 use Drupal\field\FieldException;
 use Drupal\field\FieldInstanceInterface;
 
diff --git a/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php b/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
index a4f54f0..6cdbc99 100644
--- a/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
+++ b/core/modules/hal/lib/Drupal/hal/Normalizer/EntityReferenceItemNormalizer.php
@@ -65,7 +65,7 @@ public function normalize($field_item, $format = NULL, array $context = array())
   protected function constructValue($data, $context) {
     $field_item = $context['target_instance'];
     $field_definition = $field_item->getDefinition();
-    $target_type = $field_definition['settings']['target_type'];
+    $target_type = $field_definition->getFieldSetting('target_type');
     if ($id = $this->entityResolver->resolve($this, $data, $target_type)) {
       return array('target_id' => $id);
     }
diff --git a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldItemNormalizer.php b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldItemNormalizer.php
index fdd8156..7caf380 100644
--- a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldItemNormalizer.php
+++ b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldItemNormalizer.php
@@ -57,8 +57,8 @@ public function denormalize($data, $class, $format = NULL, array $context = arra
     if (isset($data['lang'])) {
       $langcode = $data['lang'];
       unset($data['lang']);
-      $field_definition = $field_item->getDefinition();
-      if ($field_definition['translatable']) {
+      $field_definition = $field_item->getFieldDefinition();
+      if ($field_definition->isFieldTranslatable()) {
         $field_item = $this->createTranslatedInstance($field_item, $langcode);
       }
     }
diff --git a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
index cbf8b29..e5eaac1 100644
--- a/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
+++ b/core/modules/hal/lib/Drupal/hal/Normalizer/FieldNormalizer.php
@@ -33,11 +33,11 @@ public function normalize($field, $format = NULL, array $context = array()) {
     // Get the field definition.
     $entity = $field->getEntity();
     $field_name = $field->getName();
-    $field_definition = $entity->getPropertyDefinition($field_name);
+    $field_definition = $field->getFieldDefinition();
 
     // If this field is not translatable, it can simply be normalized without
     // separating it into different translations.
-    if (empty($field_definition['translatable'])) {
+    if (!$field_definition->isFieldTranslatable()) {
       $normalized_field_items = $this->normalizeFieldItems($field, $format, $context);
     }
     // Otherwise, the languages have to be extracted from the entity and passed