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Edit File: DeferJS.php

<?php
declare(strict_types=1);

namespace WP_Rocket\Engine\Optimization\DeferJS;

use WP_Rocket\Admin\Options_Data;

class DeferJS {
	/**
	 * Options instance
	 *
	 * @var Options_Data
	 */
	private $options;

/**
	 * Array of inline exclusions list.
	 *
	 * @var string[]
	 */
	private $inline_exclusions = [
		'DOMContentLoaded',
		'document.write',
		'window.lazyLoadOptions',
		'N.N2_',
		'rev_slider_wrapper',
		'FB3D_CLIENT_LOCALE',
		'ewww_webp_supported',
	];

/**
	 * Instantiate the class
	 *
	 * @param Options_Data $options Options instance.
	 */
	public function __construct( Options_Data $options ) {
		$this->options = $options;
	}

/**
	 * Add the exclude defer JS option in WP Rocket options array
	 *
	 * @since 3.8
	 *
	 * @param array $options WP Rocket options array.
	 * @return array
	 */
	public function add_option( array $options ) : array {
		$options['exclude_defer_js'] = [];

return $options;
	}

/**
	 * Defer all JS files.
	 *
	 * @since 3.8
	 *
	 * @param string $html HTML content.
	 * @return string
	 */
	public function defer_js( string $html ) : string {
		if ( ! $this->can_defer_js() ) {
			return $html;
		}

$buffer_nocomments = preg_replace( '//Uis', '', $html );

preg_match_all( '#<script\s+(?:[^>]+[\s\'"])?src\s*=\s*[\'"]\s*?(?<url>[^\'"]+)\s*?[\'"](?:[^>]+)?\/?>#i', $buffer_nocomments, $matches, PREG_SET_ORDER );

if ( empty( $matches ) ) {
			return $html;
		}

$exclude_defer_js = implode( '|', $this->get_excluded() );

foreach ( $matches as $tag ) {
			if ( preg_match( '#(' . $exclude_defer_js . ')#i', $tag['url'] ) ) {
				continue;
			}

if ( preg_match( '/\s+(?:async|defer)/i', $tag[0] ) ) {
				continue;
			}

$deferred_tag = str_replace( '>', ' defer>', $tag[0] );
			$html         = str_replace( $tag[0], $deferred_tag, $html );
		}

return $html;
	}

/**
	 * Defers inline JS containing jQuery calls
	 *
	 * @since 3.8
	 *
	 * @param string $html HTML content.
	 * @return string
	 */
	public function defer_inline_js( string $html ) : string {
		if ( ! $this->can_defer_js() ) {
			return $html;
		}

$exclude_defer_js = implode( '|', $this->get_excluded() );

if ( preg_match( '/(jquery(?:.*)?\.js)/i', $exclude_defer_js ) ) {
			return $html;
		}

$buffer_nocomments = preg_replace( '//Uis', '', $html );

preg_match_all( '#<script(?:[^>]*)>(?<content>[\s\S]*?)</script>#msi', $buffer_nocomments, $matches, PREG_SET_ORDER );

if ( empty( $matches ) ) {
			return $html;
		}

/**
		 * Filters the patterns used to find jQuery in inline JS
		 *
		 * @since 3.8
		 *
		 * @param string $jquery_patterns A RegEx pattern to find jQuery inline JS.
		 */
		$jquery_patterns = apply_filters( 'rocket_defer_jquery_patterns', 'jQuery|\$\.\(|\$\(' );

$inline_exclusions = $this->get_inline_exclusions_list_pattern();

foreach ( $matches as $inline_js ) {
			if ( empty( $inline_js['content'] ) ) {
				continue;
			}

if ( preg_match( '/(application\/ld\+json)/i', $inline_js[0] ) ) {
				continue;
			}

if ( empty( $inline_exclusions ) || preg_match( "/({$inline_exclusions})/msi", $inline_js['content'] ) ) {
				continue;
			}

if ( ! empty( $jquery_patterns ) && ! preg_match( "/({$jquery_patterns})/msi", $inline_js['content'] ) ) {
				continue;
			}

$tag  = str_replace( $inline_js['content'], $this->inline_js_wrapper( $inline_js['content'] ), $inline_js[0] );
			$html = str_replace( $inline_js[0], $tag, $html );
		}

return $html;
	}

/**
	 * Adds the JS wrapper for inline jQuery code
	 *
	 * @since 3.8
	 *
	 * @param string $content Inline JS content.
	 * @return string
	 */
	private function inline_js_wrapper( string $content ) : string {
		return "window.addEventListener('DOMContentLoaded', function() {" . $content . '});';
	}

/**
	 * Checks if we can defer JS
	 *
	 * @since 3.8
	 *
	 * @return boolean
	 */
	private function can_defer_js() : bool {
		if ( rocket_get_constant( 'DONOTROCKETOPTIMIZE' ) ) {
			return false;
		}

if ( ! $this->options->get( 'defer_all_js', 0 ) ) {
			return false;
		}

return ! is_rocket_post_excluded_option( 'defer_all_js' );
	}

/**
	 * Get list of JS files to be excluded from defer JS.
	 *
	 * @since 3.8
	 *
	 * @return array
	 */
	public function get_excluded() : array {
		$exclude_defer_js = [
			'gist.github.com',
			'content.jwplatform.com',
			'js.hsforms.net',
			'www.uplaunch.com',
			'google.com/recaptcha',
			'widget.reviews.co.uk',
			'verify.authorize.net/anetseal',
			'lib/admin/assets/lib/webfont/webfont.min.js',
			'app.mailerlite.com',
			'widget.reviews.io',
			'simplybook.(.*)/v2/widget/widget.js',
			'/wp-includes/js/dist/i18n.min.js',
			'/wp-content/plugins/wpfront-notification-bar/js/wpfront-notification-bar(.*).js',
			'/wp-content/plugins/oxygen/component-framework/vendor/aos/aos.js',
			'/wp-content/plugins/ewww-image-optimizer/includes/check-webp(.min)?.js',
			'static.mailerlite.com/data/(.*).js',
			'cdn.voxpow.com/static/libs/v1/(.*).js',
			'cdn.voxpow.com/media/trackers/js/(.*).js',
			'use.typekit.net',
			'www.idxhome.com',
			'/wp-includes/js/dist/vendor/lodash(.min)?.js',
			'/wp-includes/js/dist/api-fetch(.min)?.js',
			'/wp-includes/js/dist/i18n(.min)?.js',
			'/wp-includes/js/dist/vendor/wp-polyfill(.min)?.js',
			'/wp-includes/js/dist/url(.min)?.js',
			'/wp-includes/js/dist/hooks(.min)?.js',
			'www.paypal.com/sdk/js',
		];

$exclude_defer_js = array_unique( array_merge( $exclude_defer_js, $this->options->get( 'exclude_defer_js', [] ) ) );

/**
		 * Filter list of Deferred JavaScript files
		 *
		 * @since 2.10
		 *
		 * @param array $exclude_defer_js An array of URLs for the JS files to be excluded.
		 */
		$exclude_defer_js = apply_filters( 'rocket_exclude_defer_js', $exclude_defer_js );

foreach ( $exclude_defer_js as $i => $exclude ) {
			$exclude_defer_js[ $i ] = str_replace( '#', '\#', $exclude );
		}

return $exclude_defer_js;
	}

/**
	 * Excludes jQuery from combine JS when defer and combine are enabled
	 *
	 * @since 3.8
	 *
	 * @param array $excluded_files Array of excluded files from combine JS.
	 * @return array
	 */
	public function exclude_jquery_combine( array $excluded_files ) : array {
		if ( ! $this->can_defer_js() ) {
			return $excluded_files;
		}

if ( ! (bool) $this->options->get( 'minify_concatenate_js', 0 ) ) {
			return $excluded_files;
		}

$excluded_files[] = '/jquery-?[0-9.]*(.min|.slim|.slim.min)?.js';

return $excluded_files;
	}

/**
	 * Adds jQuery to defer JS exclusion field if safe mode was enabled before 3.8
	 *
	 * @since 3.8
	 *
	 * @return void
	 */
	public function exclude_jquery_upgrade() {
		$options = get_option( 'wp_rocket_settings' );

if ( ! isset( $options['defer_all_js_safe'] ) ) {
			return;
		}

if ( ! (bool) $options['defer_all_js_safe'] ) {
			return;
		}

$options['exclude_defer_js'][] = '/jquery-?[0-9.]*(.min|.slim|.slim.min)?.js';

update_option( 'wp_rocket_settings', $options );
	}

/**
	 * Get exclusion list pattern.
	 *
	 * @return string
	 */
	private function get_inline_exclusions_list_pattern() {
		$inline_exclusions_list = $this->inline_exclusions;

/**
		 * Filters the patterns used to find inline JS that should not be deferred
		 *
		 * @since 3.8
		 *
		 * @param array $inline_exclusions_list Array of inline JS that should not be deferred.
		 */
		$additional_inline_exclusions_list = apply_filters( 'rocket_defer_inline_exclusions', null );

$inline_exclusions = '';

// Check if filter return is string so convert it to array for backward compatibility.
		if ( is_string( $additional_inline_exclusions_list ) ) {
			$additional_inline_exclusions_list = explode( '|', $additional_inline_exclusions_list );
		}

// Cast filter return to array.
		$inline_exclusions_list = array_merge( $inline_exclusions_list, (array) $additional_inline_exclusions_list );

foreach ( $inline_exclusions_list as $inline_exclusions_item ) {
			$inline_exclusions .= preg_quote( (string) $inline_exclusions_item, '#' ) . '|';
		}

return rtrim( $inline_exclusions, '|' );
	}
}