Function onMessage

onMessage(fn): Unsubscribe
Subscribe to incoming chat messages.
Parameters
- fn: ((message) => void)
  
  Handler that receives each message.
  - - (message): void
    - Parameters
      
      message: ChatMessage
      
      Returns void
Returns Unsubscribe
A function that cancels the subscription. Call it on teardown.
- Defined in packages/core/subpaths/chat/index.ts:128