Allow submitting form without adding a message in useChat hook

[vercel]

Allow submitting form without adding a message in useChat hook

[MaxLeiter]

Can you use reload? https://sdk.vercel.ai/docs/api-reference/use-chat

[lesleh]

@MaxLeiter unfortunately not, reload works differently. Instead of adding another assistant response, it removes the last assistant response and requests a new one. So you couldn't use it to make the hook request another assistant message without providing an additional user message.

[shuding]

I think you can call append manually with role set to 'assistant'?

[lesleh]

@shuding I don't believe so, append looks like it's more for adding a message with content you already have, not asking for a new message to be generated.

[shuding]

It seems like we need a new option in reload to explicitly send a request without removing the last assistant response. For example reload({ removeLastAssistantMessage: true }). Need a better name though.

[pomber]

It seems like we need a new option in reload to explicitly send a request without removing the last assistant response. For example reload({ removeLastAssistantMessage: true }). Need a better name though.

Maybe even more flexibility? reload(messages => transformTheMessagesBeforeSendingThem(messages))

I need this so I can modify the last user message before reloading.

[shuding]

Love the idea from @pomber, vote for this:

reload({
  transform: (messages) => newMessages
})

So we can have other options added in the future. PR welcome!

[prashantbhudwal]

@shuding Raised PR. #989

#989