How to use pinyin

static isValidNameHint(nameHint, userName) {
  const pinyinRaw = pinyin(userName, {
   style: pinyin.STYLE_FIRST_LETTER,
  });

  let pinyinName = '';
  for (const py of pinyinRaw) {
   if (py[0] && py[0] !== ' ') {
    pinyinName += py[0];
   }
  }

  const nameRe = new RegExp(nameHint[1], 'ig');
  return nameRe.test(userName) || nameRe.test(pinyinName);
 }

bot.onText(/\/aqi (.+)/, (msg, match) => {
 let city = match[1];
 const re = /[^\u4e00-\u9fa5]|[\uFE30-\uFFA0]/;
 if (!re.test(city)) {
  city = pinyin(city, {
   segment: true,
   style: pinyin.STYLE_NORMAL,
  });
  city = city.join('');
 }

 console.log(`query ${city} city`);
 request(`http://aqicn.org/aqicn/json/android/${city}/json`, (error, response, body) => {
  if (!error && response.statusCode === 200) {
   const res = JSON.parse(body);
   if (res.wgt) {
    console.log(res.wgt);
    bot.sendPhoto(msg.chat.id, res.wgt);
   }
  } else {
   console.error(error);
  }
 });
});