AMP Disable ES Modules

amp-disable-esm.php

<?php
/**
 * AMP Disable ES Modules.
 *
 * @package   AMP_Disable_ESM
 * @author    Alain Schlesser <alain.schlesser@gmail.com>
 * @link      https://gist.github.com/schlessera/4127ab30f4235f1acbc11e3eee77701a
 * @license   GPL-2.0-or-later
 *
 * @wordpress-plugin
 * Plugin Name: AMP Disable ES Modules
 * Plugin URI: https://gist.github.com/schlessera/4127ab30f4235f1acbc11e3eee77701a
 * Description: Disable the use of ES modules by the AMP Optimizer via <code>amp_esm=0</code>.
 * Version: 0.1
 * Author: Alain Schlesser <alain.schlesser@gmail.com>
 * Author URI: https://alainschlesser.com/
 * License: MIT
 * Gist Plugin URI: https://gist.github.com/schlessera/4127ab30f4235f1acbc11e3eee77701a
 */

use AmpProject\Optimizer\Transformer\RewriteAmpUrls;
use AmpProject\Optimizer\Configuration\RewriteAmpUrlsConfiguration;

if ( isset( $_GET['amp_esm'] ) && false === rest_sanitize_boolean( $_GET['amp_esm'] ) ) {
	add_filter( 'amp_optimizer_config', static function ( $config ) {
		$config[ RewriteAmpUrls::class ][ RewriteAmpUrlsConfiguration::ESM_MODULES_ENABLED ] = false;
		return $config;
	} );
}