Next15 Cookies can only be modified in a Server Action or Route Handler.

[keagancoding]

I may be dumb so I didn't open a real issue, but how do I fix this?

Im reading from cookies in middleware, and in some actions i'm writing to them, the error seems to come from when I try to write from an action

Example:

// action-client.ts

// "use server" cannot use this here or it throws errors
export const protectedProcedure = createSafeActionClient({ validationAdapter: zodAdapter(), }).use(async ({ next }) => {
    const session = await getIronSession<Session>(await cookies(), sessionOptions)

    if (!session.user || session.user.expires < Date.now()) {
        throw new ActionError("Unauthorized")
    }

    return next({ ctx: { session, db } })
})

// actions.ts

"use server"
export const authSignOut = protectedProcedure.action(async () => {
    const session = await getIronSession<Session>(await cookies(), sessionOptions)
    session.user = undefined
    await session.save()
})