Add WooCommerce integration with Google Analytics

plugins/web-worker-offloading/load.php

@@ -47,3 +47,4 @@
 
 require_once __DIR__ . '/helper.php';
 require_once __DIR__ . '/hooks.php';
+require_once __DIR__ . '/third-party.php';

plugins/web-worker-offloading/readme.txt

@@ -11,15 +11,23 @@ Offload JavaScript execution to a Web Worker.
 
 == Description ==
 
-This plugin offloads JavaScript execution to a Web Worker, improving performance by freeing up the main thread.
+This plugin offloads JavaScript execution to a Web Worker, improving performance by freeing up the main thread. This should translate into improved [Interaction to Next Paint](https://web.dev/articles/inp) (INP) scores. _This functionality is considered experimental._
 
-In order to opt-in a script to be loaded in a worker, simply add `worker` script data to a registered script. For example,
+In order to opt in a script to be loaded in a worker, simply add `worker` script data to a registered script. For example,
 if you have a script registered with the handle of `foo`, opt-in to offload it to a web worker by doing:
 
 `
 wp_script_add_data( 'foo', 'worker', true );
 `
 
+Otherwise, the plugin currently ships with built-in integrations to offload Google Analytics to a web worker for the following plugins:
+
+* [Rank Math SEO](https://wordpress.org/plugins/seo-by-rank-math/)
+* [Site Kit by Google](https://wordpress.org/plugins/google-site-kit/)
+* [WooCommerce](https://wordpress.org/plugins/woocommerce/)
+
+Please monitor your analytics once activating to ensure all the expected events are being logged. At the same time, monitor your INP scores to check for improvement.
+
 == Frequently Asked Questions ==
 
 = Why are my offloaded scripts not working and I see a 404 error in the console for `partytown-sandbox-sw.html`? =

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

@@ -0,0 +1,76 @@
+<?php
+/**
+ * Third-party integration loader for Web Worker Offloading.
+ *
+ * @since 0.1.0
+ * @package web-worker-offloading
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+/**
+ * Adds forwarded events for Google Analytics.
+ *
+ * @since 0.1.0
+ * @link https://partytown.builder.io/google-tag-manager#forward-events
+ *
+ * @param array<string, mixed>|mixed $configuration Configuration.
+ * @return array<string, mixed> Configuration.
+ */
+function wwo_add_google_analytics_forwarded_events( $configuration ): array {
+	$configuration = (array) $configuration;
+
+	$configuration['forward'][] = 'dataLayer.push';
+	return $configuration;
+}
+
+/**
+ * Adds a script to be offloaded to a worker.
+ *
+ * @param string $script_handle Script handle.
+ */
+function wwo_mark_script_for_offloading( string $script_handle ): void {
+	add_filter(
+		'print_scripts_array',
+		static function ( $script_handles ) use ( $script_handle ) {
+			if ( in_array( $script_handle, (array) $script_handles, true ) ) {
+				wp_script_add_data( $script_handle, 'worker', true );
+			}
+			return $script_handles;
+		}
+	);
+}
+
+/**
+ * Loads third party plugin integrations for active plugins.
+ *
+ * @since 0.1.0
+ */
+function wwo_load_third_party_integrations(): void {
+	$plugins_with_integrations = array(
+		// TODO: google-site-kit.
+		// TODO: seo-by-rank-math.
+		'woocommerce',
+	);
+
+	// Load corresponding file for each string in $plugins if the WordPress plugin is installed and active.
+	$active_plugin_slugs = array_filter(
+		array_map(
+			static function ( $plugin_file ) {
+				if ( is_string( $plugin_file ) && str_contains( $plugin_file, '/' ) ) {
+					return strtok( $plugin_file, '/' );
+				} else {
+					return false;
+				}
+			},
+			(array) get_option( 'active_plugins' )
+		)
+	);
+
+	foreach ( array_intersect( $active_plugin_slugs, $plugins_with_integrations ) as $plugin_slug ) {
+		require_once __DIR__ . '/third-party/' . $plugin_slug . '.php';
+	}
+}
+add_action( 'plugins_loaded', 'wwo_load_third_party_integrations' );

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

@@ -0,0 +1,15 @@
+<?php
+/**
+ * Web Worker Offloading integration with WooCommerce.
+ *
+ * @since 0.1.0
+ * @package web-worker-offloading
+ */
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly.
+}
+
+add_filter( 'wwo_configuration', 'wwo_add_google_analytics_forwarded_events' );
+wwo_mark_script_for_offloading( 'google-tag-manager' );
+wwo_mark_script_for_offloading( 'woocommerce-google-analytics-integration-gtag' );