Switch-bundle-wp.php

<?

function register_scripts() {
	// include the base style in the header.
	$base_js = WP_DEBUG ? 'http://localhost:8080/bundle.js' : get_stylesheet_directory_uri() . ( '/static/app.js' );

	wp_register_script(
		'base-script', // handle name.
		$base_js,
		null, // an array of dependent styles.
		'1.0', // version number.
		false // CSS media type.
	);
	wp_enqueue_script( 'base-script' );

	// remove JS
	wp_deregister_script('jquery');
}

add_action( 'wp_enqueue_scripts', "register_scripts");