How to use the jsbeautifier.unpackers.UnpackingError function in jsbeautifier

juicers = [
        (r"}\('(.*)', *(\d+|\[\]), *(\d+), *'(.*)'\.split\('\|'\), *(\d+), *(.*)\)\)"),
        (r"}\('(.*)', *(\d+|\[\]), *(\d+), *'(.*)'\.split\('\|'\)"),
    ]
    for juicer in juicers:
        args = re.search(juicer, source, re.DOTALL)
        if args:
            a = args.groups()
            if a[1] == "[]":
                a = list(a)
                a[1] = 62
                a = tuple(a)
            try:
                return a[0], a[3].split('|'), int(a[1]), int(a[2])
            except ValueError:
                raise UnpackingError('Corrupted p.a.c.k.e.r. data.')

    # could not find a satisfying regex
    raise UnpackingError(
        'Could not make sense of p.a.c.k.e.r data (unexpected code structure)')

def _filterargs(source):
    """Juice from a source file the four args needed by decoder."""
    argsregex = (r"}\('(.*)', *(\d+), *(\d+), *'(.*)'\."
                 r"split\('\|'\), *(\d+), *(.*)\)\)")
    args = re.search(argsregex, source, re.DOTALL).groups()

    try:
        return args[0], args[3].split('|'), int(args[1]), int(args[2])
    except ValueError:
        raise UnpackingError('Corrupted p.a.c.k.e.r. data.')

]
    for juicer in juicers:
        args = re.search(juicer, source, re.DOTALL)
        if args:
            a = args.groups()
            if a[1] == "[]":
                a = list(a)
                a[1] = 62
                a = tuple(a)
            try:
                return a[0], a[3].split('|'), int(a[1]), int(a[2])
            except ValueError:
                raise UnpackingError('Corrupted p.a.c.k.e.r. data.')

    # could not find a satisfying regex
    raise UnpackingError(
        'Could not make sense of p.a.c.k.e.r data (unexpected code structure)')

def _filter(source):
    """Extracts and decode payload (original file) from `source`"""
    try:
        varname = re.search(r'eval\(\w+\(\w+\((\w+)\)\)\);', source).group(1)
        reverse = re.search(r"var +%s *\= *'(.*)';" % varname, source).group(1)
    except AttributeError:
        raise UnpackingError('Malformed MyObfuscate data.')
    try:
        return base64.b64decode(reverse[::-1].encode('utf8')).decode('utf8')
    except TypeError:
        raise UnpackingError('MyObfuscate payload is not base64-encoded.')

def unpack(source):
    """Unpacks P.A.C.K.E.R. packed js code."""
    payload, symtab, radix, count = _filterargs(source)

    if count != len(symtab):
        raise UnpackingError('Malformed p.a.c.k.e.r. symtab.')

    try:
        unbase = Unbaser(radix)
    except TypeError:
        raise UnpackingError('Unknown p.a.c.k.e.r. encoding.')

    def lookup(match):
        """Look up symbols in the synthetic symtab."""
        word  = match.group(0)
        return symtab[unbase(word)] or word

    source = re.sub(r'\b\w+\b', lookup, payload)
    return _replacestrings(source)

def unpack(self, source, evalcode=False):
        import jsbeautifier.unpackers as unpackers
        try:
            return unpackers.run(source, evalcode)
        except unpackers.UnpackingError as error:
            print('error:', error)
            return ''

def unpack(source):
    """Unpacks P.A.C.K.E.R. packed js code."""
    payload, symtab, radix, count = _filterargs(source)

    if count != len(symtab):
        raise UnpackingError('Malformed p.a.c.k.e.r. symtab.')

    try:
        unbase = Unbaser(radix)
    except TypeError:
        raise UnpackingError('Unknown p.a.c.k.e.r. encoding.')

    def lookup(match):
        """Look up symbols in the synthetic symtab."""
        word  = match.group(0)
        return symtab[unbase(word)] or word

    source = re.sub(r'\b\w+\b', lookup, payload)
    return _replacestrings(source)