Add updater functionality for react setMessage

[sshkeda]

Feature Description

Add updater functionality for react setMessage to make functions like this possible:

function addMessage(message: Message) {
  setMessages((messages) => [...messages, message]);
}

Use Case

I am building an extension app to help developers with web accessibility conformance. It is useful to add sequential messages programmatically; however, because there is no updater function, it is hard to sync the message values after each re-render.

See example of me using this feature here https://github.com/sshkeda/waccesible.ai/blob/054c4636840f765e681b0883428b6d57d116c212/extension/src/App.tsx#L29-L84

Additional context

No response

[sshkeda]

PR created https://github.com/vercel/ai/pull/832

[Gr33nLight]

Any updates on this?

[kachar]

Bump on this

[lgrammel]

https://github.com/vercel/ai/pull/2347