channelView method
The API ChannelView of channelId for principalId.
Implementation
JsonMap channelView(String principalId, String channelId) => {
'channel': channels[channelId]!.json,
'level': levelOf(principalId, channelId),
'capabilities': [
...?channels[channelId]!.capabilities[principalId]?.toList()?..sort(),
],
};