message: optional hints
diff: @@ -36,7 +36,7 @@ export default class MultiFormatOneDReader extends OneDReader {
  private readers: OneDReader[] = [];
  - public constructor(hints: Map<DecodeHintType, any>) {
  + public constructor(hints?: Map<DecodeHintType, any>) {
  super();
  const possibleFormats = !hints ? null : <BarcodeFormat[]>hints.get(DecodeHintType.POSSIBLE_FORMATS);
  const useCode39CheckDigit = hints && hints.get(DecodeHintType.ASSUME_CODE_39_CHECK_DIGIT) !== undefined;
  