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);
    }

}