Bug 283793 – `indexedDB` undefined when a ServiceWorker is awoken

• Component: Service Workers
• Status: NEW

Created attachment 473387 [details]
iOS Safari showing the bug

It would seem like `indexedDB` is undefined when a service worker is running in the background. I found this bug while trying to implement a PWA (in fact, it is one of several other Safari-specific issues: https://developer.apple.com/forums/thread/769794)

As a minimal example, consider this push handler:

```js
  self.addEventListener("push", function (event) {
    try {
      var data = event.data.json();

      event.waitUntil(Promise.all([
        registration.showNotification(
          data.title,
          {
            body: (data.body || "") + typeof self.indexedDB,
            icon: "",
          },
        ),
      ]));
    } catch (e) {
      console.error("Error processing push event", e);
    }
  }, false);

```

The notification body will end with `object` while the PWA is running, and then it'll end with `undefined` when the app isn't in the foreground.

As a minimal example reproducing this, I've got a repository: https://github.com/ApelegHQ/webpush-demo/tree/indexedDB-webkit-bug (the branch, 'indexedDB-webkit-bug' is important to see the `indexedDB` issue).

Created attachment 473388 [details]
`indexedDB` is defined in Android

[Radar WebKit Bug Importer]

<rdar://problem/140667780>