add_action( 'wp_enqueue_scripts', 'custom_scripts' );
function custom_scripts() {
	//JS
	wp_register_script('custom-js', get_stylesheet_directory_uri() . "/js/custom.js", array('jquery'), false, false);
  wp_enqueue_script('custom-js');
}

(function($) {

	// $ Works! You can test it with next line if you like
	// console.log($);

})( jQuery );