text: import lancasterStemmer from 'lancaster-stemmer';
  import porterStemmer from 'stemmer';
  
  const defaultMaxWords = 100;
  const defaultStopwords = ["a","a's","able","about","above","according","accordingly","across","actually","after","afterwards","again","against","ain't","all","allow","allows","almost","alone","along","already","also","although","always","am","among","amongst","an","and","another","any","anybody","anyhow","anyone","anything","anyway","anyways","anywhere","apart","appear","appreciate","appropriate","are","aren't","around","as","aside","ask","asking","associated","at","available","away","awfully","b","be","became","because","become","becomes","becoming","been","before","beforehand","behind","being","believe","below","beside","besides","best","better","between","beyond","both","brief","but","by","c","c'mon","c's","came","can","can't","cannot","cant","cause","causes","certain","certainly","changes","clearly","co","com","come","comes","concerning","consequently","consider","considering","contain","containing","contains","corresponding","could","couldn't","course","currently","d","definitely","described","despite","did","didn't","different","do","does","doesn't","doing","don't","done","down","downwards","during","e","each","edu","eg","eight","either","else","elsewhere","enough","entirely","especially","et","etc","even","ever","every","everybody","everyone","everything","everywhere","ex","exactly","example","except","f","far","few","fifth","first","five","followed","following","follows","for","former","formerly","forth","four","from","further","furthermore","g","get","gets","getting","given","gives","go","goes","going","gone","got","gotten","greetings","h","had","hadn't","happens","hardly","has","hasn't","have","haven't","having","he","he's","hello","help","hence","her","here","here's","hereafter","hereby","herein","hereupon","hers","herself","hi","him","himself","his","hither","hopefully","how","howbeit","however","i","i'd","i'll","i'm","i've","ie","if","ignored","immediate","in","inasmuch","inc","indeed","indicate","indicated","indicates","inner","insofar","instead","into","inward","is","isn't","it","it'd","it'll","it's","its","itself","j","just","k","keep","keeps","kept","know","known","knows","l","last","lately","later","latter","latterly","least","less","lest","let","let's","like","liked","likely","little","look","looking","looks","ltd","m","mainly","many","may","maybe","me","mean","meanwhile","merely","might","more","moreover","most","mostly","much","must","my","myself","n","name","namely","nd","near","nearly","necessary","need","needs","neither","never","nevertheless","new","next","nine","no","nobody","non","none","noone","nor","normally","not","nothing","novel","now","nowhere","o","obviously","of","off","often","oh","ok","okay","old","on","once","one","ones","only","onto","or","other","others","otherwise","ought","our","ours","ourselves","out","outside","over","overall","own","p","particular","particularly","per","perhaps","placed","please","plus","possible","presumably","probably","provides","q","que","quite","qv","r","rather","rd","re","really","reasonably","regarding","regardless","regards","relatively","respectively","right","s","said","same","saw","say","saying","says","second","secondly","see","seeing","seem","seemed","seeming","seems","seen","self","selves","sensible","sent","serious","seriously","seven","several","shall","she","should","shouldn't","since","six","so","some","somebody","somehow","someone","something","sometime","sometimes","somewhat","somewhere","soon","sorry","specified","specify","specifying","still","sub","such","sup","sure","t","t's","take","taken","tell","tends","th","than","thank","thanks","thanx","that","that's","thats","the","their","theirs","them","themselves","then","thence","there","there's","thereafter","thereby","therefore","therein","theres","thereupon","these","they","they'd","they'll","they're","they've","think","third","this","thorough","thoroughly","those","though","three","through","throughout","thru","thus","to","together","too","took","toward","towards","tried","tries","truly","try","trying","twice","two","u","un","under","unfortunately","unless","unlikely","until","unto","up","upon","us","use","used","useful","uses","using","usually","uucp","v","value","various","very","via","viz","vs","w","want","wants","was","wasn't","way","we","we'd","we'll","we're","we've","welcome","well","went","were","weren't","what","what's","whatever","when","whence","whenever","where","where's","whereafter","whereas","whereby","wherein","whereupon","wherever","whether","which","while","whither","who","who's","whoever","whole","whom","whose","why","will","willing","wish","with","within","without","won't","wonder","would","wouldn't","x","y","yes","yet","you","you'd","you'll","you're","you've","your","yours","yourself","yourselves","z","zero"]; // prettier-ignore
  
  export function tokenizeWords(content, settings = {}) {
    const { allowNumbers, maxWords, stemmer, stopwordsInput } = settings;
  
    const stopwords = stopwordsInput
      .split(',')
      .map((stopword) => stopword.toLowerCase().trim());
    const stopwordsSet = new Set(
      [...defaultStopwords, ...stopwords].map((stopword) =>
        stopword.toLowerCase(),
      ),
    );
  
    const matched = content.match(/\w+/g);
    if (!matched) {
      return [];
    }
  
    const tokens = matched
      .map((token) => token.toLowerCase())
      .filter((token) => {
        const filterByStopwords = !stopwordsSet.has(token);
        return allowNumbers
          ? filterByStopwords
          : filterByStopwords && Number.isNaN(Number(token));
      })
      .map((token) => {
        switch (stemmer) {
          case 'porter':
            return porterStemmer(token);
          case 'lancaster':
            return lancasterStemmer(token);
          default:
            return token;
        }
      });
  
    const frequency = {};
    tokens.forEach((token) => {
      if (frequency[token]) {
        frequency[token].value += 1;
      } else {
        frequency[token] = {
          text: token,
          value: 1,
        };
      }
    });
  
    return Object.values(frequency)
      .sort((a, b) => b.value - a.value)
      .slice(0, maxWords || defaultMaxWords);
  }
  