fix(router): filter out non-actionable errors from third-party scripts (#771)

Co-authored-by: Sarah Gerrard <gerrardsarah@gmail.com>

Author: TkDodo

src/router.tsx

@@ -53,6 +53,27 @@ if (typeof document !== 'undefined') {
     // Session Replay
     replaysSessionSampleRate: 0.1, // This sets the sample rate at 10%. You may want to change it to 100% while in development and then sample at a lower rate in production.
     replaysOnErrorSampleRate: 1.0, // If you're not already sampling the entire session, change the sample rate to 100% when sampling sessions where errors occur.
+    beforeSend(event) {
+      // Filter out errors from third-party ad tech scripts (e.g. Publift's
+      // Fuse Platform ftUtils.js) that are not actionable by us.
+      const frames = event.exception?.values?.flatMap(
+        (v) => v.stacktrace?.frames ?? [],
+      )
+      if (
+        frames &&
+        frames.length > 0 &&
+        frames.every((frame) => {
+          const filename = frame.filename ?? ''
+          return (
+            filename.includes('ftUtils.js') ||
+            filename.includes('fuseplatform.net')
+          )
+        })
+      ) {
+        return null
+      }
+      return event
+    },
   })
 
   deferSentryReplayIntegration()