Get piped input in nodejs script

cli.js

function getPipedInput () {
  return new Promise(resolve => {
    let result = ''

    process.stdin.resume()
    process.stdin.setEncoding('utf8')
    process.stdin.on('data', chunk => (result += chunk))
    process.stdin.on('end', () => resolve(result))
  })
}

getPipedInput().then(input => {
  // ...
})