Change client-side password validation message in Drupal 10

password_validation_message_in_drupal_10.md

We are going to replace "Make it at least 8 characters" from the user core modules (core/modules/user/user.module) with "Make it at least 12 characters".

/**
 * Implements hook_element_info_alter().
 */
function <your_module>_element_info_alter(array &$types): void
{
    if (isset($types['password_confirm'])) {
        $types['password_confirm']['#process'][] = 'users_form_process_password_confirm';
    }
}

/**
 * Form element process handler for client-side password validation.
 */
function <your_module>_form_process_password_confirm($element): array
{
    if (!empty($element['#attached']['drupalSettings']['password'])) {
        $element['#attached']['drupalSettings']['password']['tooShort'] = t('Make it at least 8 characters');
    }

    return $element;
}