5.1 Load file jquery.validate.min.js trước theme.js (ok)

function twentyseventeen_scripts() {
	wp_enqueue_script('jquery.validate', get_template_directory_uri() . '/public/js/jquery.validate.min.js', array('jquery'), $version,true);
	wp_register_script('pftheme-customjs', get_template_directory_uri() . '/public/js/theme.js', 
	array(
		'jquery',
		'jquery.validate'
	), $version,true);
	wp_enqueue_script('pftheme-customjs');
}
add_action( 'wp_enqueue_scripts', 'twentyseventeen_scripts' );