TextLongItem.php

<?php

namespace Drupal\text\Plugin\Field\FieldType;

use Drupal\Core\Field\FieldStorageDefinitionInterface;

/**
 * Plugin implementation of the 'text_long' field type.
 *
 * @FieldType(
 *   id = "text_long",
 *   label = @Translation("Text (formatted, long)"),
 *   description = @Translation("This field stores a long text with a text format."),
 *   category = @Translation("Text"),
 *   default_widget = "text_textarea",
 *   default_formatter = "text_default"
 * )
 */
class TextLongItem extends TextItemBase {
    
    /**
     * {@inheritdoc}
     */
    public static function schema(FieldStorageDefinitionInterface $field_definition) {
        return [
            'columns' => [
                'value' => [
                    'type' => 'text',
                    'size' => 'big',
                ],
                'format' => [
                    'type' => 'varchar_ascii',
                    'length' => 255,
                ],
            ],
            'indexes' => [
                'format' => [
                    'format',
                ],
            ],
        ];
    }

}