SubscribedMessageHandler - Photon

Called for all messages in threads that have been subscribed via thread.subscribe(). This includes:

Follow-up messages from users
Messages that @-mention the bot (check message.isMention)

Does NOT fire for:

The message that triggered the subscription (e.g., the initial @mention)
Messages sent by the bot itself

chat.onSubscribedMessage(async (thread, message) => {
  // Handle all follow-up messages
  if (message.isMention) {
    // User @-mentioned us in a subscribed thread
  }
  await thread.post(`Got your message: ${message.text}`);
});

type SubscribedMessageHandler = (thread: Thread<TState>, message: Message, context: MessageContext) => void | Promise<void>

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