vue-awesome-swiperでループをさせるが, 先頭の場合だけ戻るスワイプをできないようにする

<template>
  <swiper :options="swiperOptions" ref="movieSwiper">
    <swiper-slide></swiper-slide>
  </swiper>
</template>

<script>
export default {
  data() {
    return {
      swiperOptions: {
        allowSlidePrev: false,
        loop: true,
        direction: 'vertical',
        on: {
          touchMove: (swiper) => {
            if (swiper.activeIndex === 1 && swiper.swipeDirection === 'prev') {
              this.swiper.allowSlidePrev = false
            } else {
              this.swiper.allowSlidePrev = true
            }
          },
      },
    }
  },
  computed: {
    swiper() {
      return this.$refs.movieSwiper.$swiper
    },
  },
}
</script>