Remove anagrams from text list

anagrams.js

function anagrams(textList) {
  const anagramList = [];
  const foundAnagrams = [];

  for (let i = 0; i < textList.length - 1; i++) {
    const baseStr = textList[i];

    if (!foundAnagrams.includes(baseStr)) {
      const anagramsOnly = getAnagrams(baseStr, textList.slice(i + 1));
      foundAnagrams.push(...anagramsOnly);
      if (anagramsOnly.length) {
        anagramList.push(baseStr);
      }
    }
  }

  return anagramList;
}

function getAnagrams(baseStr, textList) {
  return textList.filter(str => isAnagram(baseStr, str));
}

function isAnagram(baseStr, compareStr) {
  if (isSameSize(baseStr, compareStr)) {
    const str1 = baseStr.split('').sort().join('');
    const str2 = compareStr.split('').sort().join('');
    return str1.indexOf(str2) === 0;
  }

  return false;
}

function isSameSize(str1, str2) {
  return str1.length === str2.length;
}

const text = [
  'code',
  'doce',
  'ecod',
  'framer',
  'frame',
  'agian',
  'nagai',
  'rafem',
  'farme',
  'mefra',
  'again',
];

console.log(anagrams(text));