trait UsePusherChannelConventions (View source)
| bool | isGuardedChannel(string $channel) Return true if channel is protected by authentication. | |
| string | normalizeChannelName(string $channel) Remove prefix from channel name. | 
Return true if channel is protected by authentication.
Remove prefix from channel name.
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    https://laravel.com/api/8.x/Illuminate/Broadcasting/Broadcasters/UsePusherChannelConventions.html