Integrate Web Worker Offloading with Rank Math SEO

plugins/web-worker-offloading/third-party.php

@@ -40,11 +40,13 @@ static function ( $to_do ) use ( $script_handles ) {
 function plwwo_load_third_party_integrations(): void {
 	$plugins_with_integrations = array(
 		// TODO: google-site-kit.
-		// TODO: seo-by-rank-math.
-		'woocommerce' => static function (): bool {
+		'woocommerce'      => static function (): bool {
 			// See <https://woocommerce.com/document/query-whether-woocommerce-is-activated/>.
 			return class_exists( 'WooCommerce' );
 		},
+		'seo-by-rank-math' => static function (): bool {
+			return class_exists( 'RankMath' );
+		},
 	);
 
 	foreach ( $plugins_with_integrations as $plugin_slug => $active_callback ) {

plugins/web-worker-offloading/third-party/seo-by-rank-math.php

@@ -0,0 +1,76 @@
+<?php
+/**
+ * Web Worker Offloading integration with Rank Math SEO.
+ *
+ * @since n.e.x.t
+ * @package web-worker-offloading
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Configures WWO for Rank Math SEO and Google Analytics.
+ *
+ * @since 0.1.0
+ * @access private
+ * @link https://partytown.builder.io/google-tag-manager#forward-events
+ *
+ * @param array<string, mixed>|mixed $configuration Configuration.
+ * @return array<string, mixed> Configuration.
+ */
+function plwwo_rank_math_configure( $configuration ): array {
+	$configuration = (array) $configuration;
+
+	$configuration['globalFns'][] = 'gtag'; // Because gtag() is defined in one script and called in another.
+	$configuration['forward'][]   = 'dataLayer.push'; // Because the Partytown integration has this in its example config.
+	return $configuration;
+}
+add_filter( 'plwwo_configuration', 'plwwo_rank_math_configure' );
+
+/*
+ * Note: The following integration is not targeting the \RankMath\Analytics\GTag::enqueue_gtag_js() code which is only
+ * used for WP<5.7. In WP 5.7, the wp_script_attributes and wp_inline_script_attributes filters were introduced, and
+ * Rank Math then deemed it preferable to use wp_print_script_tag() and wp_print_inline_script_tag() rather than
+ * wp_enqueue_script() and wp_add_inline_script(), respectively. Since Web Worker Offloading requires WP 6.5+, there
+ * is no point to integrate with the pre-5.7 code in Rank Math.
+ */
+
+/**
+ * Filters script attributes to offload Rank Math's GTag script tag to Partytown.
+ *
+ * @since n.e.x.t
+ * @link https://github.com/rankmath/seo-by-rank-math/blob/c78adba6f78079f27ff1430fabb75c6ac3916240/includes/modules/analytics/class-gtag.php#L161-L167
+ *
+ * @param array|mixed $attributes Script attributes.
+ * @return array|mixed Filtered script attributes.
+ */
+function plwwo_rank_math_filter_script_attributes( $attributes ) {
+	if ( isset( $attributes['id'] ) && 'google_gtagjs' === $attributes['id'] ) {
+		wp_enqueue_script( 'web-worker-offloading' );
+		$attributes['type'] = 'text/partytown';
+	}
+	return $attributes;
+}
+
+add_filter( 'wp_script_attributes', 'plwwo_rank_math_filter_script_attributes' );
+
+/**
+ * Filters inline script attributes to offload Rank Math's GTag script tag to Partytown.
+ *
+ * @since n.e.x.t
+ * @link https://github.com/rankmath/seo-by-rank-math/blob/c78adba6f78079f27ff1430fabb75c6ac3916240/includes/modules/analytics/class-gtag.php#L169-L174
+ *
+ * @param array|mixed $attributes Script attributes.
+ * @return array|mixed Filtered inline script attributes.
+ */
+function plwwo_rank_math_filter_inline_script_attributes( $attributes ) {
+	if ( isset( $attributes['id'] ) && 'google_gtagjs-inline' === $attributes['id'] ) {
+		wp_enqueue_script( 'web-worker-offloading' );
+		$attributes['type'] = 'text/partytown';
+	}
+	return $attributes;
+}
+
+add_filter( 'wp_inline_script_attributes', 'plwwo_rank_math_filter_inline_script_attributes' );