const shuffle = (flavors: string[]): string[] => flavors.sort(() => Math.random() - 0.5);
Discussion
雪猫さんのをベースにしたらこんな感じか
const flavors = ["powa", "moge", "puru"];
const randomFlavors = flavors.sort(() => Math.random() - 0.5);
console.log(randomFlavors[0]);