message: rm exact from facemode
diff: @@ -80,7 +80,7 @@ export class BrowserCodeReader {
  let constraints: MediaStreamConstraints;
  if (undefined === deviceId) {
  constraints = {
  - video: { facingMode: { exact: 'environment' } }
  + video: { facingMode: 'environment' }
  };
  } else {
  constraints = {
  