How to use the @zxing/library.Exception.NotFoundException function in @zxing/library

const luminanceSource = new HTMLCanvasElementLuminanceSource(this.canvasElement);
        const binaryBitmap = new BinaryBitmap(new HybridBinarizer(luminanceSource));

        try {
            const result = this.readerDecode(binaryBitmap);

            callbackFn(result);

            if (!once && !!this.stream) {
                setTimeout(() => this.decodeWithDelay(callbackFn), this.timeBetweenScansMillis);
            }
        } catch (re) {

            console.log(retryIfChecksumOrFormatError, re);

            if (retryIfNotFound && Exception.isOfType(re, Exception.NotFoundException)) {
                console.warn('Not found, trying again...');

                this.decodeWithDelay(callbackFn);
            } else if (
                retryIfChecksumOrFormatError &&
                (
                    Exception.isOfType(re, Exception.ChecksumException) ||
                    Exception.isOfType(re, Exception.FormatException)
                )
            ) {
                console.log('Checksum or format error, trying again...', re);

                this.decodeWithDelay(callbackFn);
            }
        }
    }