Enable srcset when wp-stateless and Google Bucket is used

functions.php

add_filter( 'max_srcset_image_width', __NAMESPACE__ . '\\remove_max_srcset_image_width', 99 );
/**
 * Reset max srcset image width.
 *
 * @param int $max_width The maximum image width to be included in the 'srcset'. Default '1600'.
 *
 * @return bool You can return sensible value also this resets to default 1600.
 */
function remove_max_srcset_image_width( $max_width ) {
    return false;
}

add_filter( 'wp_calculate_image_srcset', __NAMESPACE__ . '\\stateless_cdn_srcset' );
/**
 * Wp-stateless can't generate it's own google bucket links so we need to create them manyally.
 *
 * @param array $sources One or more arrays of source data to include in the 'srcset'.
 *
 * @return array
 */
function stateless_cdn_srcset( $sources ) {
    if ( is_plugin_active( 'wp-stateless/wp-stateless-media.php' ) ) {
        foreach ( $sources as $source ) {
            // Default upload path
            $wp_upload = wp_upload_dir();
            $bucket_name = 'change this';
            $bucket_baseurl = 'https://storage.googleapis.com/' . $bucket_name;
            // Find Wordpress' default upload path and replace it with Google bucket path.
            $sources[ $source[ 'value' ] ][ 'url' ] = str_replace( $wp_upload[ 'baseurl' ], $bucket_baseurl, $sources[ $source[ 'value' ] ][ 'url' ] );
        }
    }

    return $sources;
}