$updated store gets enabled on iOS Safari after pollInterval with no updates pushed

[tyler-johnson]

I have been seeing something odd on iOS Safari. I have some basic code which is subscribed to the updated store. On iOS (and only iOS), this store is set to true every single time the pollInterval is hit. What's odd is that I cannot replicate when I build locally and run like I do in production.

  let mid: string | undefined;

  const unsubscribe = updated.subscribe((hasUpdate) => {
    if (hasUpdate) {
      if (!mid) {
        mid = store.add({
          type: "info",
          message: "A new version of the app is available. A refresh is required.",
          dissmissable: false,
          buttons: [
            {
              text: "Refresh",
              onClick: () => {
                window.location.reload();
              },
            },
          ],
        });
      }
    } else if (mid) {
      store.remove(mid);
      mid = undefined;
    }
  });

• This issue only occurs on my live production build. Locally running in production mode does not seem to trigger it.
• The issue only occurs on iOS Safari. I can't get it to happen on any other browser, including Safari on Mac.
• My attempts to debug have failed as iOS safari is definitely requesting version.json and getting back the correct value.

My only other thought is that the way the production copy is being built is different from my local copy, but its odd that iOS is the only one with the problem.

Happy to provide any additional details for those who might have some ideas. Thanks!