Do I need a transition to call a server action in "onSubmit"?

[pastel thunder]

I have a page where I want to ge the initial value during static rendering, and then relay with SWR client-side to do polling for new values without refresh
The user can increment the value
User can increment the value, when this happens I need to invalidate SWR locally => this means calling "mutate()" after the server action is done => this means I can't write action={incrementCounter}, I have to use onSubmit
The doc mentions using "transitions" when calling Server Actions outside of "action", is that mandatory? Can I write onSubmit={async (evt) => { await incrementCounter(evt.formData); mutate("/api/counter")} } or should I also involve transitions here?

[dreamy geode]

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[pastel thunder]

Small bump

[hollow spire]

The transition is recommended because it marks the action trigger as a react transition, same way react transition is recommended for router methods.

But it is not required. As far as I know, "use server" marks exported async functions as server-side functions callable by the client, so you can use it like normal client-side async functions without having to wrap it inside transition APIs

[pastel thunder]

What I don't get is that transitions seems needed for slow blocking operations like rendering

while normally an async call should not block

so perphaps it brings the possibility of cancelling the call?

[hollow spire]

• so i found this very interesting note: transitions must be synchronous. meanwhile server actions must be asynchronous. i'm struggling to even cleanly combine the two in a way that TS is happy.
• using server actions without startTransition used to be documented in the nextjs documentation, but removed in this commit.

[hollow spire]

i opened this https://github.com/vercel/next.js/issues/57652 because it no longer makes sense to me anymore

[young glade]

does the title have to be so large and scary