Accepts a word and returns the same word in pig latin

piglatin.js

const pigLatin = str => {
    let pigStr = "";
    const key = ["a", "e", "i", "o", "u"];
    if (key.some(val => val === str.charAt(0))) {
        pigStr = str + "way";
        return pigStr;
    } else {
        pigStr = str.slice(1) + str.charAt(0) + "ay";
        return pigStr;
    }
}