[Node.js] err 구조

[Error: ENOENT: no such file or directory, open 'C:\Users\user\Desktop\node.js\test\test.txt'] {
  errno: -4058,
  code: 'ENOENT',
  syscall: 'open',
  path: 'C:\Users\user\Desktop\node.js\test\test.txt'
}

<err 사용법>
err.errno
err.code
err.syscall
err.path