How to use the genie-toolkit/lib/i18n/american-english.detokenize function in genie-toolkit

param = 'picture';
            else if (param.endsWith('_id'))
                param = param.substring(0, param.length-3);
            else if (param === 'p_to')
                param = 'recipient';

            if (match === '$$')
              utterance += '\\$';
            else
              utterance += '\\_\\_\\_\\_ {\\small (' + clean(param) + ')}';
        }
    }
    let sentence = '';
    let prevtoken = null;
    for (let token of utterance.split(' ')) {
        sentence = detokenize(sentence, prevtoken, token);
        prevtoken = token;
    }
    buf += sentence;

    buf += '\n\n';
    return buf;
}