Вот так выглядит отрывок кода где она встречается:
if (word === '') {
hw = '';
} else if (enableCache && lo.cache && lo.cache.hasOwnProperty(word)) { //the word is in the cache
hw = lo.cache[word];
} else if (word.indexOf(hyphen) !== -1) {
//word already contains shy; -> leave at it is!
hw = word;
} else if (lo.exceptions.hasOwnProperty(word)) { //the word is in the exceptions list
hw = lo.exceptions[word].replace(/-/g, hyphen);
} else if (word.indexOf('-') !== -1) {
hw = hyphenateCompound(lo, lang, word);
}