Determine if Two Strings Are Close

export function closeStrings(word1: string, word2: string): boolean {
  if (word1.length !== word2.length) {
    return false;
  }
  const set1 = Array.from(new Set(word1)).sort();
  const set2 = Array.from(new Set(word2)).sort();
 
  if (!shallowCompare(set1, set2)) {
    return false;
  }
 
  const counter1 = new Map<string, number>();
  const counter2 = new Map<string, number>();
 
  for (let i = 0; i < word1.length; i++) {
    counter1.set(word1[i], (counter1.get(word1[i]) || 0) + 1);
    counter2.set(word2[i], (counter2.get(word2[i]) || 0) + 1);
  }
 
  const count1 = Array.from(counter1.values()).sort((a, b) => a - b);
  const count2 = Array.from(counter2.values()).sort((a, b) => a - b);
 
  return shallowCompare(count1, count2);
}
 
function shallowCompare<T>(arr1: Array<T>, arr2: Array<T>) {
  if (arr1.length !== arr2.length) {
    return false;
  }
  for (let i = 0; i < arr1.length; i++) {
    if (arr1[i] !== arr2[i]) {
      return false;
    }
  }
  return true;
}