FileSize.php

<?php

namespace Drupal\file\Plugin\Field\FieldFormatter;

use Drupal\Core\Field\Attribute\FieldFormatter;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Field\FormatterBase;
use Drupal\Core\StringTranslation\ByteSizeMarkup;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Formatter that shows the file byte size in a human-readable way.
 */
class FileSize extends FormatterBase {
  
  /**
   * {@inheritdoc}
   */
  public function viewElements(FieldItemListInterface $items, $langcode) {
    $elements = [];
    foreach ($items as $delta => $item) {
      $elements[$delta] = [
        '#markup' => ByteSizeMarkup::create((int) $item->value),
      ];
    }
    return $elements;
  }

}