Function permute

packages/tailwindcss/src/variants.test.ts:2758–2767

(arr: string[])

test('variants with the same root are sorted deterministically', async () => {
  function permute(arr: string[]): string[][] {
    if (arr.length <= 1) return [arr]

    return arr.flatMap((item, i) =>
      permute([...arr.slice(0, i), ...arr.slice(i + 1)]).map((permutation) => [
        item,
        ...permutation,
      ]),
    )
  }

  let classLists = permute([
    'data-hover:flex',