feat: add support for speculative prerender

README.md

@@ -17,6 +17,7 @@ It's key differentiator are:
 - 🌍 Experience Platform enabled: the library fully integrates with our main Adobe Experience Platform and all the services of our ecosystem
 - 🚀 extremely fast: the library is optimized to reduce load delay, TBT and CLS, and has minimal impact on your Core Web Vitals
 - 👤 privacy-first: the library does not track end users by default, and can easily be integrated with your preferred consent management system to open up more advanced use cases
+- 🔬 prerender support: the library supports [speculative prerendering](https://developer.mozilla.org/en-US/docs/Web/API/Speculation_Rules_API) out-of-the-box, and won't fire Analytics events (and artificially inflate your page views) until the page is actually viewed
 
 ## Prerequisites
 

src/index.js

@@ -194,13 +194,21 @@ export async function sendAnalyticsEvent(xdmData, dataMapping = {}, configOverri
   // eslint-disable-next-line no-console
   console.assert(config.analytics, 'Analytics tracking is disabled in the martech config');
   try {
-    // eslint-disable-next-line no-undef
-    return window[config.alloyInstanceName]('sendEvent', {
+    const fn = () => window[config.alloyInstanceName]('sendEvent', {
       documentUnloading: true,
       xdm: xdmData,
       data: dataMapping,
       edgeConfigOverrides: configOverrides,
     });
+    if (document.prerendering) {
+      return new Promise((resolve) => {
+        document.addEventListener('prerenderingchange', async () => {
+          await fn();
+          resolve();
+        }, { once: true });
+      });
+    }
+    return fn();
   } catch (err) {
     handleRejectedPromise(new Error(err));
     return Promise.reject(new Error(err));