Pig Latin - How does the while loop end?

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Can someone Kindly explain how does this while loop end if there are only consonants and no vowel in the argument (arr)?
As far as i understand,
The loop starts at charAt(0) —> shift() it —> push() it into the SAME array (strArr).
How does the loop end if there are no vowels in the word and the challenge needs me to check for that condition also.

Thank you.

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Your code so far

function translatePigLatin(str) {
    var strArr = [];
    var tmpChar;

    // check if the char is consonant using RegEx
    function isConsonant(char) {
        return !/[aeiou]/.test(char);

    // return initial str + "way" if it starts with vowel
    // if not - convert str to array
    if (!isConsonant(str.charAt(0)))
        return str + "way";
        strArr = str.split("");

    // push all consonats to the end of the array
    while (isConsonant(strArr[0])) {
        tmpChar = strArr.shift();
 // convert array to string and concatenate "ay" at the end  
 return strArr.join("")+"ay";

// test here

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Link to the challenge:

this is checking if the first letter of the array is a consonant, if it is then it is removed from be beginning of the array and added at the end , and then the new first letter is tested, and keeps going till the first letter is a vowel

if there are no vowels it is an infinite loop

How should i modify the code then?
Since the challenge requires the code MUST BE ABLE TO HANDLE WORDS WITHOUT VOWELS

check if there is any vowel before the loop then

the simplest way you could use is a regex

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Thank You so much @ieahleen.