Can Promise.all handle results as soon as possible, not waiting for all promises done

I am using KOA2 to demo a bigpipe. I want to output a result as soon as possible when it's ready, rather than waiting until all results are ready(then output all).

I stuck here as code below: (get_users or get_posts return a promise)

async (ctx, next) => {

    ctx.res.write("<html><body>...")

    let data = await Promise.all( [res_fetch.get_users(), res_fetch.get_posts()] )

    ctx.res.write(data[0])
    ctx.res.write(data[1])
    ctx.res.write("</body></html>")
    ctx.res.end()

}

Ideally it should be something: (which I don't know how to achieve)

let data = await Promise.oneFinished( [res_fetch.get_users(), res_fetch.get_posts()] )

if (data[0] is finished)
    ctx.res.write(data[0])
else if (data[1] is finished)
    ctx.res.write(data[1])

Solution

  let data = await
    Promise.all([
        res_fetch.get_users().then(result => {
            ctx.res.write(result)
        }),
        res_fetch.get_posts().then(result => {
            ctx.res.write(result)
        }),
    ])


    ctx.res.write("</body></html>")
    ctx.res.end()