How to use the blinkid-react-native.MrtdRecognizerResult function in blinkid-react-native

blinkIdResult.dateOfExpiry.year + "." + fieldDelim;
            }
            // there are other fields to extract
            localState.results += resultString;

            // Document image is returned as Base64 encoded JPEG
            if (blinkIdResult.fullDocumentImage) {
                localState.showImageDocument = true;
                localState.resultImageDocument = 'data:image/jpg;base64,' + blinkIdResult.fullDocumentImage;
            }
            // Face image is returned as Base64 encoded JPEG
            if (blinkIdResult.faceImage) {
                localState.showImageFace = true;
                localState.resultImageFace = 'data:image/jpg;base64,' + blinkIdResult.faceImage;
            }
        } else if (result instanceof BlinkIDReactNative.MrtdRecognizerResult) {
            let mrtdResult = result;
            localState.results +=
                "First name: " + mrtdResult.mrzResult.secondaryId + fieldDelim +
                "Last name: " + mrtdResult.mrzResult.primaryId + fieldDelim +
                "Nationality: " + mrtdResult.mrzResult.nationality + fieldDelim +
                "Gender: " + mrtdResult.mrzResult.gender + fieldDelim +
                "Date of birth: " +
                    mrtdResult.mrzResult.dateOfBirth.day + "." +
                    mrtdResult.mrzResult.dateOfBirth.month + "." +
                    mrtdResult.mrzResult.dateOfBirth.year + ".";
            
              // Document image is returned as Base64 encoded JPEG
              if (mrtdResult.fullDocumentImage) {
                  localState.showImageDocument = true;
                  localState.resultImageDocument = 'data:image/jpg;base64,' + mrtdResult.fullDocumentImage;
              }