Function guessHandleType

lib/internal/util.js:860–863

(fd)

const handleTypes = ['TCP', 'TTY', 'UDP', 'FILE', 'PIPE', 'UNKNOWN'];
function guessHandleType(fd) {
  const type = _guessHandleType(fd);
  return handleTypes[type];
}

class WeakReference {
  #weak = null;