How to use the writev function from graceful-fs

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// Function signature is
// s.writev(fd, buffers[, position], callback)
// We need to handle the optional arg, so we use ...args
exports.writev = function (fd, buffers, ...args) {
  if (typeof args[args.length - 1] === 'function') {
    return fs.writev(fd, buffers, ...args)
  }

  return new Promise((resolve, reject) => {
    fs.writev(fd, buffers, ...args, (err, bytesWritten, buffers) => {
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