BroadcastChannel not supported in Safari

[damianpm]

Authentication files (authServiceWorker.ts and authHelper.ts) use BroadcastChannel, but it's not supported in Safari, it fails with the following error:

[Error] ReferenceError: Can't find variable: BroadcastChannel
	(anonymous function) (logoutButton.js:20458)
	(anonymous function) (logoutButton.js:9)
	(anonymous function) (logoutButton.js:20470)
	(anonymous function) (logoutButton.js:9)
	(anonymous function) (logoutButton.js:20490)
	Global Code (logoutButton.js:20534)
[Error] ReferenceError: Can't find variable: BroadcastChannel
	(anonymous function) (login.js:20459)
	(anonymous function) (login.js:9)
	(anonymous function) (login.js:20471)
	(anonymous function) (login.js:9)
	(anonymous function) (login.js:20505)
	Global Code (login.js:20549)
[Log] ServiceWorker registration failed:  (login, line 90)
TypeError: ReferenceError: Can't find variable: BroadcastChannel

See compatibility table at:
https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel#browser_compatibility,