From 37fa6d88b4727ee837615239acb954f5ec809dd4 Mon Sep 17 00:00:00 2001
From: soloturn <soloturn@gmail.com>
Date: Wed, 11 Nov 2026 07:19:18 +0100
Subject: [PATCH] fix: ship a self-unregistering sw.js to retire the old Gatsby
 service worker

Returning visitors still run the worker gatsby-plugin-offline installed and see the old site from its cache. /sw.js now 404s, which not every browser treats as an unregister. This one clears caches, unregisters and reloads open tabs.

Co-Authored-By: soloturn <soloturn@gmail.com>
---
 public/sw.js | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 public/sw.js

diff --git a/public/sw.js b/public/sw.js
new file mode 100644
index 00000000..9bae1f62
--- /dev/null
+++ b/public/sw.js
@@ -0,0 +1,15 @@
+// Retires the service worker the old Gatsby site installed in visitors' browsers.
+// Safe to delete once old registrations have had months to expire.
+self.addEventListener("install", () => self.skipWaiting());
+
+self.addEventListener("activate", (event) => {
+  event.waitUntil(
+    (async () => {
+      for (const key of await caches.keys()) await caches.delete(key);
+      await self.registration.unregister();
+      for (const client of await self.clients.matchAll({ type: "window" })) {
+        client.navigate(client.url);
+      }
+    })(),
+  );
+});