(v5) If there is no onResponse callback, how can I execute custom code when llm responds?

[NeroBlackstone]

I noticed onResponse callback function in useChat has been removed in ai sdk v5.

But... what is replacement ?? How can I execute custom code when llm responds?

[NeroBlackstone]

Okay, my workaround (svelte):

  $effect(() => {
    if (useChat.status === 'streaming') {
      untrack(() => onResponse());
    }
  });
  function onResponse() {
      // callback here!
  }

[NeroBlackstone]

oh i see - what use case do you need this for?

My use case is to perform a frontend route, replace URL when the LLM starts responding.

[lgrammel]

can you create an issue? i want to reintroduce the hook, but most likely with different params/return value/name

[NeroBlackstone]

can you create an issue? i want to reintroduce the hook, but most likely with different params/return value/name

Here it is: #6980

[cacoos]

I didn't know onResponse existed! I used to send a custom data part like "stream started" and handle that on the client.

And you can do that now easily in v5.

You can send a custom data part when the first chunk arrives (in the onChunk handler of streamText)

[pedrocarnevale]

I'm with the same problem
I've always used onResponse.
I don't understand how would you remove a feature from users
Now I'm refactoring everything to be able to use ai sdk 5
It is being a pain for me