Email.php

<?php

namespace Drupal\field\Plugin\migrate\field;

use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate_drupal\Attribute\MigrateField;
use Drupal\migrate_drupal\Plugin\migrate\field\FieldPluginBase;
// cspell:ignore spamspan

/**
 * MigrateField Plugin for Drupal 6 and 7 email fields.
 */
class Email extends FieldPluginBase {
  
  /**
   * {@inheritdoc}
   */
  public function getFieldWidgetMap() {
    return [
      'email_textfield' => 'email_default',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFieldFormatterMap() {
    return [
      'email_formatter_default' => 'email_mailto',
      'email_formatter_contact' => 'basic_string',
      'email_formatter_plain' => 'basic_string',
      'email_formatter_spamspan' => 'basic_string',
      'email_default' => 'email_mailto',
      'email_contact' => 'basic_string',
      'email_plain' => 'basic_string',
      'email_spamspan' => 'basic_string',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function defineValueProcessPipeline(MigrationInterface $migration, $field_name, $data) {
    $process = [
      'plugin' => 'sub_process',
      'source' => $field_name,
      'process' => [
        'value' => 'email',
      ],
    ];
    $migration->setProcessOfProperty($field_name, $process);
  }

}