Read and return all of stdin in node

readStdin.js

function readStdin () {
  return new Promise((resolve, reject) => {
    process.stdin.resume()
    process.stdin.setEncoding('utf8')
    let buffer = ''
    process.stdin.on('data', (chunk) => {
      buffer += chunk
    })
    process.stdin.on('error', (err) => {
      reject(err)
    })
    process.stdin.on('end', () => {
      resolve(buffer)
    })
  })
}

const input = await readStdin()