Adjust old sw.js file to remove itself, allowing new service-worker.js to be activated

static/sw.js

@@ -0,0 +1,16 @@
+// Remove the service worker /sw.js from legacy installations
+// This should then enable the new /service-worker.js to be installed
+
+self.addEventListener('activate', function (e) {
+  console.log(`Unregistering service worker`)
+  self.registration.unregister()
+    .then(function () {
+      return self.clients.matchAll();
+    })
+    .then(function (clients) {
+      clients.forEach(client => {
+        console.log(`Navigating ${client.url}`)
+        client.navigate(client.url)
+      })
+    });
+});

svelte.config.js

@@ -1,6 +1,6 @@
 import adapter from '@sveltejs/adapter-static';
 
-export default {
+const config = {
   kit: {
     adapter: adapter({
       pages: 'build',
@@ -11,3 +11,5 @@ export default {
     })
   }
 };
+
+export default config;