Quick Sort in Typescript

const quickSort = <T>(array: T[]): T[] => {
    if (array.length < 2)
        return array;

    const lastIndexOfArray = array.length - 1;
    const pivot = array[lastIndexOfArray];

    const leftArray: T[] = [], rightArray: T[] = [];

    for (const element of array.slice(0, lastIndexOfArray))
        (element < pivot) ? leftArray.push(element) : rightArray.push(element);

    return [...quickSort(leftArray), pivot, ...quickSort(rightArray)];
}

export default quickSort;