Sort an Array by 2 Criteria

function solve(input) {
    let sorted = input.sort(sortedNames);
    console.log(sorted.join('\n'));

    function sortedNames(a, b) {
        let firstCriteria = a.length - b.length;

        if (firstCriteria === 0) {
            return a.localeCompare(b);
        }
        return firstCriteria;
    }
}
/*Write a function that orders an array of strings, by their length in ascending order as primary criteria, and by alphabetical value in ascending order as second criteria. The comparison should be case-insensitive.*/