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diff --git a/web/core/modules/field/src/Entity/FieldConfig.php b/web/core/modules/field/src/Entity/FieldConfig.php
new file mode 100644
index 000000000..af2fcca73
--- /dev/null
+++ b/web/core/modules/field/src/Entity/FieldConfig.php
@@ -0,0 +1,344 @@
+<?php
+
+namespace Drupal\field\Entity;
+
+use Drupal\Core\Entity\EntityStorageInterface;
+use Drupal\Core\Field\FieldConfigBase;
+use Drupal\Core\Field\FieldException;
+use Drupal\field\FieldStorageConfigInterface;
+use Drupal\field\FieldConfigInterface;
+
+/**
+ * Defines the Field entity.
+ *
+ * @ConfigEntityType(
+ *   id = "field_config",
+ *   label = @Translation("Field"),
+ *   handlers = {
+ *     "access" = "Drupal\field\FieldConfigAccessControlHandler",
+ *     "storage" = "Drupal\field\FieldConfigStorage"
+ *   },
+ *   config_prefix = "field",
+ *   entity_keys = {
+ *     "id" = "id",
+ *     "label" = "label"
+ *   },
+ *   config_export = {
+ *     "id",
+ *     "field_name",
+ *     "entity_type",
+ *     "bundle",
+ *     "label",
+ *     "description",
+ *     "required",
+ *     "translatable",
+ *     "default_value",
+ *     "default_value_callback",
+ *     "settings",
+ *     "field_type",
+ *   }
+ * )
+ */
+class FieldConfig extends FieldConfigBase implements FieldConfigInterface {
+
+  /**
+   * Flag indicating whether the field is deleted.
+   *
+   * The delete() method marks the field as "deleted" and removes the
+   * corresponding entry from the config storage, but keeps its definition in
+   * the state storage while field data is purged by a separate
+   * garbage-collection process.
+   *
+   * Deleted fields stay out of the regular entity lifecycle (notably, their
+   * values are not populated in loaded entities, and are not saved back).
+   *
+   * @var bool
+   */
+  protected $deleted = FALSE;
+
+  /**
+   * The associated FieldStorageConfig entity.
+   *
+   * @var \Drupal\field\Entity\FieldStorageConfig
+   */
+  protected $fieldStorage;
+
+  /**
+   * Constructs a FieldConfig object.
+   *
+   * In most cases, Field entities are created via
+   * FieldConfig::create($values), where $values is the same
+   * parameter as in this constructor.
+   *
+   * @param array $values
+   *   An array of field properties, keyed by property name. The
+   *   storage associated with the field can be specified either with:
+   *   - field_storage: the FieldStorageConfigInterface object,
+   *   or by referring to an existing field storage in the current configuration
+   *   with:
+   *   - field_name: The field name.
+   *   - entity_type: The entity type.
+   *   Additionally, a 'bundle' property is required to indicate the entity
+   *   bundle to which the field is attached to. Other array elements will be
+   *   used to set the corresponding properties on the class; see the class
+   *   property documentation for details.
+   *
+   * @see entity_create()
+   */
+  public function __construct(array $values, $entity_type = 'field_config') {
+    // Allow either an injected FieldStorageConfig object, or a field_name and
+    // entity_type.
+    if (isset($values['field_storage'])) {
+      if (!$values['field_storage'] instanceof FieldStorageConfigInterface) {
+        throw new FieldException('Attempt to create a configurable field for a non-configurable field storage.');
+      }
+      $field_storage = $values['field_storage'];
+      $values['field_name'] = $field_storage->getName();
+      $values['entity_type'] = $field_storage->getTargetEntityTypeId();
+      // The internal property is fieldStorage, not field_storage.
+      unset($values['field_storage']);
+      $values['fieldStorage'] = $field_storage;
+    }
+    else {
+      if (empty($values['field_name'])) {
+        throw new FieldException('Attempt to create a field without a field_name.');
+      }
+      if (empty($values['entity_type'])) {
+        throw new FieldException("Attempt to create a field '{$values['field_name']}' without an entity_type.");
+      }
+    }
+    // 'bundle' is required in either case.
+    if (empty($values['bundle'])) {
+      throw new FieldException("Attempt to create a field '{$values['field_name']}' without a bundle.");
+    }
+
+    parent::__construct($values, $entity_type);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function postCreate(EntityStorageInterface $storage) {
+    parent::postCreate($storage);
+
+    // Validate that we have a valid storage for this field. This throws an
+    // exception if the storage is invalid.
+    $this->getFieldStorageDefinition();
+
+    // 'Label' defaults to the field name (mostly useful for fields created in
+    // tests).
+    if (empty($this->label)) {
+      $this->label = $this->getName();
+    }
+  }
+
+  /**
+   * Overrides \Drupal\Core\Entity\Entity::preSave().
+   *
+   * @throws \Drupal\Core\Field\FieldException
+   *   If the field definition is invalid.
+   * @throws \Drupal\Core\Entity\EntityStorageException
+   *   In case of failures at the configuration storage level.
+   */
+  public function preSave(EntityStorageInterface $storage) {
+    $entity_manager = \Drupal::entityManager();
+    $field_type_manager = \Drupal::service('plugin.manager.field.field_type');
+
+    $storage_definition = $this->getFieldStorageDefinition();
+
+    // Filter out unknown settings and make sure all settings are present, so
+    // that a complete field definition is passed to the various hooks and
+    // written to config.
+    $default_settings = $field_type_manager->getDefaultFieldSettings($storage_definition->getType());
+    $this->settings = array_intersect_key($this->settings, $default_settings) + $default_settings;
+
+    if ($this->isNew()) {
+      // Notify the entity storage.
+      $entity_manager->onFieldDefinitionCreate($this);
+    }
+    else {
+      // Some updates are always disallowed.
+      if ($this->entity_type != $this->original->entity_type) {
+        throw new FieldException("Cannot change an existing field's entity_type.");
+      }
+      if ($this->bundle != $this->original->bundle) {
+        throw new FieldException("Cannot change an existing field's bundle.");
+      }
+      if ($storage_definition->uuid() != $this->original->getFieldStorageDefinition()->uuid()) {
+        throw new FieldException("Cannot change an existing field's storage.");
+      }
+      // Notify the entity storage.
+      $entity_manager->onFieldDefinitionUpdate($this, $this->original);
+    }
+
+    parent::preSave($storage);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function calculateDependencies() {
+    parent::calculateDependencies();
+    // Mark the field_storage_config as a dependency.
+    $this->addDependency('config', $this->getFieldStorageDefinition()->getConfigDependencyName());
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function preDelete(EntityStorageInterface $storage, array $fields) {
+    $state = \Drupal::state();
+
+    parent::preDelete($storage, $fields);
+    // Keep the field definitions in the state storage so we can use them
+    // later during field_purge_batch().
+    $deleted_fields = $state->get('field.field.deleted') ?: [];
+    foreach ($fields as $field) {
+      if (!$field->deleted) {
+        $config = $field->toArray();
+        $config['deleted'] = TRUE;
+        $config['field_storage_uuid'] = $field->getFieldStorageDefinition()->uuid();
+        $deleted_fields[$field->uuid()] = $config;
+      }
+    }
+    $state->set('field.field.deleted', $deleted_fields);
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function postDelete(EntityStorageInterface $storage, array $fields) {
+    // Clear the cache upfront, to refresh the results of getBundles().
+    \Drupal::entityManager()->clearCachedFieldDefinitions();
+
+    // Notify the entity storage.
+    foreach ($fields as $field) {
+      if (!$field->deleted) {
+        \Drupal::entityManager()->onFieldDefinitionDelete($field);
+      }
+    }
+
+    // If this is part of a configuration synchronization then the following
+    // configuration updates are not necessary.
+    $entity = reset($fields);
+    if ($entity->isSyncing()) {
+      return;
+    }
+
+    // Delete the associated field storages if they are not used anymore and are
+    // not persistent.
+    $storages_to_delete = [];
+    foreach ($fields as $field) {
+      $storage_definition = $field->getFieldStorageDefinition();
+      if (!$field->deleted && !$field->isUninstalling() && $storage_definition->isDeletable()) {
+        // Key by field UUID to avoid deleting the same storage twice.
+        $storages_to_delete[$storage_definition->uuid()] = $storage_definition;
+      }
+    }
+    if ($storages_to_delete) {
+      \Drupal::entityManager()->getStorage('field_storage_config')->delete($storages_to_delete);
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function linkTemplates() {
+    $link_templates = parent::linkTemplates();
+    if (\Drupal::moduleHandler()->moduleExists('field_ui')) {
+      $link_templates["{$this->entity_type}-field-edit-form"] = 'entity.field_config.' . $this->entity_type . '_field_edit_form';
+      $link_templates["{$this->entity_type}-storage-edit-form"] = 'entity.field_config.' . $this->entity_type . '_storage_edit_form';
+      $link_templates["{$this->entity_type}-field-delete-form"] = 'entity.field_config.' . $this->entity_type . '_field_delete_form';
+
+      if (isset($link_templates['config-translation-overview'])) {
+        $link_templates["config-translation-overview.{$this->entity_type}"] = "entity.field_config.config_translation_overview.{$this->entity_type}";
+      }
+    }
+    return $link_templates;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function urlRouteParameters($rel) {
+    $parameters = parent::urlRouteParameters($rel);
+    $entity_type = \Drupal::entityManager()->getDefinition($this->entity_type);
+    $bundle_parameter_key = $entity_type->getBundleEntityType() ?: 'bundle';
+    $parameters[$bundle_parameter_key] = $this->bundle;
+    return $parameters;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isDeleted() {
+    return $this->deleted;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFieldStorageDefinition() {
+    if (!$this->fieldStorage) {
+      $fields = $this->entityManager()->getFieldStorageDefinitions($this->entity_type);
+      if (!isset($fields[$this->field_name])) {
+        throw new FieldException("Attempt to create a field {$this->field_name} that does not exist on entity type {$this->entity_type}.");
+      }
+      if (!$fields[$this->field_name] instanceof FieldStorageConfigInterface) {
+        throw new FieldException("Attempt to create a configurable field of non-configurable field storage {$this->field_name}.");
+      }
+      $this->fieldStorage = $fields[$this->field_name];
+    }
+
+    return $this->fieldStorage;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isDisplayConfigurable($context) {
+    return TRUE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDisplayOptions($display_context) {
+    // Hide configurable fields by default.
+    return ['region' => 'hidden'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isReadOnly() {
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isComputed() {
+    return FALSE;
+  }
+
+  /**
+   * Loads a field config entity based on the entity type and field name.
+   *
+   * @param string $entity_type_id
+   *   ID of the entity type.
+   * @param string $bundle
+   *   Bundle name.
+   * @param string $field_name
+   *   Name of the field.
+   *
+   * @return static
+   *   The field config entity if one exists for the provided field
+   *   name, otherwise NULL.
+   */
+  public static function loadByName($entity_type_id, $bundle, $field_name) {
+    return \Drupal::entityManager()->getStorage('field_config')->load($entity_type_id . '.' . $bundle . '.' . $field_name);
+  }
+
+}