Fix isPush support on safari in an iframe

[jkasten2]

• Unfortunately window.safari is not defined on Safari if in an iframe context
• Due to this there is no other way than to have fallback logic to
  check navigator properties if we are on macOS Safari.

---

This change is 

[itrush]

Reviewed 2 of 2 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @jkasten2)

---

src/utils/BrowserSupportsPush.ts, line 36 at r1 (raw file):

//   HTTP - navigator.serviceWorker == "undefined"

I don't see this one checked anywhere, did you miss it or checking for PushSubscriptionOptions type is enough?

[jkasten2]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @itrush)

---

src/utils/BrowserSupportsPush.ts, line 36 at r1 (raw file):

Previously, itrush (Iryna Trush) wrote…

//   HTTP - navigator.serviceWorker == "undefined"

I don't see this one checked anywhere, did you miss it or checking for PushSubscriptionOptions type is enough?

Just wanted to point out that navigator.serviceWorker is undefined in Chrome in a HTTP context to note it that it can't be used to detect the browser.

[itrush]

Reviewable status: complete! all files reviewed, all discussions resolved