getUserMedia error test

gistfile1.js

let constraints = {video: true};
(async () => {
  try{
    await navigator.mediaDevices.getUserMedia(constraints).then(function (param, streams) {
    throw error
      if (getLocalStream) {
        /*mediaDevices체크 */
        let videoTracks = streams.getVideoTracks();
        let audioTracks = streams.getAudioTracks();
        console.log('dev test selected camera : ' + videoTracks[0].label);
        console.log('dev test selected audio : ' + audioTracks[0].label);
      }
    }.bind(this, param))
    // .catch(function (param, error) {
    // }.bind(this, param));
  } catch (error) {
    //기본 카메라를 읽지 못하면 그 다음 카메라를 체크 하는 로직
    await navigator.mediaDevices.getUserMedia(constraints);
    let devices = await navigator.mediaDevices.enumerateDevices();
    console.log(devices)
  }
})()