NumberField.php

<?php

namespace Drupal\Core\Field\Plugin\migrate\field\d7;

use Drupal\field\Plugin\migrate\field\d7\NumberField as NumberFieldNew;

/**
 * MigrateField plugin for Drupal 7 number fields.
 *
 * @deprecated in drupal:8.7.0 and is removed from drupal:9.0.0. Use
 *   \Drupal\field\Plugin\migrate\field\d7\NumberField instead.
 *
 * @see https://www.drupal.org/node/3009286
 */
class NumberField extends NumberFieldNew {
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition) {
        @trigger_error(__NAMESPACE__ . '\\NumberField is deprecated in Drupal 8.7.0 and will be removed before Drupal 9.0.0. Use \\Drupal\\field\\Plugin\\migrate\\field\\d7\\NumberField instead. See https://www.drupal.org/node/3009286', E_USER_DEPRECATED);
        parent::__construct($configuration, $plugin_id, $plugin_definition);
    }

}