Node.js read stdin synchronous

stdin_async.js

async function readStdinSync() {
  return new Promise(resolve => {
    let data = ''
    process.stdin.setEncoding('utf8')
    process.stdin.resume()
    const t = setTimeout(() => {
      process.stdin.pause()
      resolve(data)
    }, 1e3)
    process.stdin.on('readable', () => {
      let chunk
      while ((chunk = process.stdin.read())) {
        data += chunk
      }
    }).on('end', () => {
      clearTimeout(t)
      resolve(data)
    })
  })
}

async function main() {
  const input = await readStdinSync()
  process.stdout.write(input) // "hello world"
  process.exit(0)
}

main()

// $ echo 'hello world' | node stdin.js
// hello world