Would client still support send SendUserCustomEvent()

[wmt2023]

Hi stream io developers,

I try to sendUserCustomEvent from react web client. It seems like official doc is out of date. The channel.sendEvent() method don't accept customEvent.
https://getstream.io/chat/docs/react/custom_events/

#664
shows SendUserCustomEvent() exist. But when I try it, it shows this method only allow server side to use. I don't undersatnd why this method exist in react code base.

Please let me know if there other method for SendUserCustomEvent().

Thanks