I got Pig Latin Solution but how can I without vowels

I got error with 'Should handle words without vowels.'

function translatePigLatin(str) {
  var index = (/[aeiou]/.exec(str)).index;
  return str.slice(index)+str.slice(0, index)+(index === 0 ? 'way' : 'ay');


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Link to the challenge:

So you have to handle the case when your index value is null…
Like if the string is the word “my”