Creates a BroadcastChannel with the given name, or undefined if the
BroadcastChannel API isn't available in the current environment (e.g.
older Safari, some webview contexts) - useful for cross-tab coordination
such as "logged out in one tab, log out everywhere".
Creates a
BroadcastChannelwith the given name, orundefinedif theBroadcastChannelAPI isn't available in the current environment (e.g. older Safari, some webview contexts) - useful for cross-tab coordination such as "logged out in one tab, log out everywhere".Ported from
luv-autoq-frontend.