❓ The problem

I'm building a chatbot using LangGraph for Node.js, and I'm trying to improve the user experience by showing a typing... indicator before the assistant actually generates a response.

The problem is: I only want to trigger this sendTyping() call if the graph decides to route through the communityChat node (i.e. if the bot will actually reply).

However, I can't figure out how to detect this routing decision before the node executes.

Using streamMode: "updates" lets me observe when a node has finished running, but that’s too late — by that point, the LLM has already responded.