trait FieldStorageCreationTrait

trait FieldStorageCreationTrait {
    
    /**
     * Configures the field for the default form mode.
     *
     * @param string $field_name
     *   The field name.
     * @param array[] $widget_settings
     *   (optional) Array of widget settings, keyed by form mode. Defaults to an
     *   empty array.
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     */
    protected function configureEntityFormDisplay(string $field_name, array $widget_settings = []) {
        // For a new field, only $mode = 'default' should be set. Use the
        // preconfigured or default widget and settings. The field will not appear
        // in other form modes until it is explicitly configured.
        foreach ($widget_settings as $mode => $options) {
            $form_display = $this->entityDisplayRepository
                ->getFormDisplay($this->entityTypeId, $this->bundle, $mode);
            if ($form_display->status()) {
                $form_display->setComponent($field_name, $options)
                    ->save();
            }
        }
        if (empty($widget_settings)) {
            $this->entityDisplayRepository
                ->getFormDisplay($this->entityTypeId, $this->bundle, 'default')
                ->setComponent($field_name, [])
                ->save();
        }
    }
    
    /**
     * Configures the field for the default view mode.
     *
     * @param string $field_name
     *   The field name.
     * @param array[] $formatter_settings
     *   (optional) An array of settings, keyed by view mode. Only the 'type' key
     *   of the inner array is used, and the value should be the plugin ID of a
     *   formatter. Defaults to an empty array.
     *
     * @throws \Drupal\Core\Entity\EntityStorageException
     */
    protected function configureEntityViewDisplay(string $field_name, array $formatter_settings = []) {
        // For a new field, only $mode = 'default' should be set. Use the
        // preconfigured or default formatter and settings. The field stays hidden
        // for other view modes until it is explicitly configured.
        foreach ($formatter_settings as $mode => $options) {
            $view_display = $this->entityDisplayRepository
                ->getViewDisplay($this->entityTypeId, $this->bundle, $mode);
            if ($view_display->status()) {
                $view_display->setComponent($field_name, $options)
                    ->save();
            }
        }
        if (empty($formatter_settings)) {
            $this->entityDisplayRepository
                ->getViewDisplay($this->entityTypeId, $this->bundle)
                ->setComponent($field_name, [])
                ->save();
        }
    }

}