group-anagram.ts

const words = ["eat", "tea", "tan", "ate", "nat", "bat"];

function updateDictionary(dict: object, word: string): void {
  const key = word.split('').sort().join('');

  if (!dict.hasOwnProperty(key)) {
    dict[key] = [];
  }
  
  dict[key].push(word); 
}

function router(words: string[]): void {
  const dictionary = {};
  
  for (let i = 0; i < words.length; i++) {
    updateDictionary(dictionary, words[i]);
  }
  
  const result = Object.keys(dictionary);
  
  for (let i = 0; i < result.length; i++) {
    const key: string[] = result[i];
    
    result[i] = dictionary[key];
  }
  
  console.log(result);
}

router(words);