If 'defer' and 'json' removed in future release of Remix, the how we set the response header?

[semet]

Im have been working with remix for quite some times, and absolutely love it.
howevenr, I always wanna to try the latest feature in every single update available. One of the thing i notice in the doc about Single fetch (Single fetch) is that defer and json will be removed in favour of v3_singleFetch and we can just return a naked object. Alright.

my question is, how we set the response header if all we return is just a naked object.. consider this example:

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const locale = await i18next.getLocale(request)
  const { currency } = await handleToken(request)
  const gameGroups = getGameGroupRequest({
    currency
  })
  const providerGroups = getProviderGroupRequest({
    currency
  })
  const languageSettings = getLanguageSettingsRequest({
    lang: locale
  })
  const styles = await getStyleRequest()

  const webSettings = await getWebSettingsRequest()
  const webMeta = await getWebMetasRequest()

  const showPromotion = webSettings.data.show_promotion.value
  return defer({
    locale,
    styles: styles.data,
    webMeta: webMeta.data,
    webSettings: webSettings.data,
    languageSettings,
    gameGroups,
    providerGroups,
    ENV: {
      API_URL: process.env.API_URL ?? '',
      API_KEY: process.env.API_KEY ?? ''
    }
  }, {
    headers: {
      'Set-Cookie':await  promotionTokenCookie.serialize(showPromotion)
    }
  })
}

and if we return naked object, it would be:

export const loader = async ({ request }: LoaderFunctionArgs) => {
  const locale = await i18next.getLocale(request)
  const { currency } = await handleToken(request)
  const gameGroups = getGameGroupRequest({
    currency
  })
  const providerGroups = getProviderGroupRequest({
    currency
  })
  const languageSettings = getLanguageSettingsRequest({
    lang: locale
  })
  const styles = await getStyleRequest()

  const webSettings = await getWebSettingsRequest()
  const webMeta = await getWebMetasRequest()

  const showPromotion = webSettings.data.show_promotion.value
  return {
    locale,
    styles: styles.data,
    webMeta: webMeta.data,
    webSettings: webSettings.data,
    languageSettings,
    gameGroups,
    providerGroups,
    ENV: {
      API_URL: process.env.API_URL ?? '',
      API_KEY: process.env.API_KEY ?? ''
    }
  }
}

Much appreciate any kind of advice...

[sergiodxa]

There's a data helper that does the same thing

[semet]

Thanks a lot... i cannot find this in the doc..
i just read along this line
https://remix.run/docs/en/main/route/headers
and here https://remix.run/docs/en/main/guides/single-fetch#headers
but cannot find a proper answer.