Sending blank response body does not provide runtime type safety

[tzezar]

having schema set like this

export const schema = {
    response: {
        201: z.object({
            status: z.literal('success'),
            data: z.object({
                id: z.number()
            })
        })
    }
}

sending blank response DOES NOT raise ts error

export const testCommandHandler = async (
    req: FastifyRequestZod<typeof schema >,
    reply: FastifyReplyZod<typeof schema >
) => {
    return reply.status(201).send()
}

changing it to object does raise ts err

return reply.status(201).send({})

[JonRC]

It's a behavior from Fastify. The send method param is optional, so you can pass whatever was inferred from the schema or undefined (nothing).

I've already opened an issue to discuss this point https://github.com/fastify/fastify/issues/5534