add example of a root service worker

This is to test OneSignal with conflicting a root service worker. This
causes the OneSignal SDK to sometimes not include a push token
when it makes a REST API to POST /users. This is due to the OneSignal
SDK sometimes getting the registration for the root service worker due
to a race condition, instead of the OneSignal service worker.

We will fix this problem in a follow up commit.

express_webpack/index.html

@@ -8,6 +8,13 @@
 <!-- NOTE: This does not work with the relative pathed manifest.json above. -->
 <!--<base href="https://www.example.com/"> -->
 <script src="sdks/web/v16/Dev-OneSignalSDK.page.js" defer></script>
+
+<script>
+  // Example of a root service worker a site may have.
+  // This is common for a PWA.
+  navigator.serviceWorker.register('sw.js');
+</script>
+
 <script>
     // NOTE: Uncomment and open site in Safari on macOS 13+ to simulate
     // a similar JS API as an iOS 16.4 WebApp.

express_webpack/server.js

@@ -34,6 +34,10 @@ app.get('/:file', (req, res) => {
     res.sendFile(sanitize(req.params.file), { root: __dirname });
 });
 
+app.get('/push/onesignal/:file', (req, res) => {
+    res.sendFile(path.join(DIST_DIR, '/push/onesignal/') + sanitize(req.params.file));
+});
+
 https.createServer(options, app).listen(4001, () => console.log("express_webpack: listening on port 4001 (https)"));
 
 // http

express_webpack/sw.js

@@ -0,0 +1,19 @@
+// Example of a root scope service worker a site might have.
+// This tests to ensure OneSignal can use the correctly scoped one when
+// 2 service workers are in play.
+
+// This exists to point out the fact this service worker is being
+// used instead of the intended OneSignalSDKWorker.js.
+self.addEventListener('push', async (e) => {
+  console.error("push - Should not fire on sw.js");
+
+  const options = {
+      body: 'Non-SDK from sw.js',
+  };
+
+  // Display notification
+  const displayPromise = self.registration.showNotification('Non-SDK from sw.js', options);
+
+  // Must wait for all promises to finish before return from this event.
+  e.waitUntil(displayPromise);
+});