export function shuffleArray<T>(array: T[]): T[] {
  let currentIndex = array.length,
    temporaryValue: T | undefined,
    randomIndex: number;
  while (0 !== currentIndex) {
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;
    // use non-null assertions because we're swapping indices that exist
    temporaryValue = array[currentIndex] as T;
    array[currentIndex] = array[randomIndex] as T;
    array[randomIndex] = temporaryValue as T;
  }
  return array;
}