I use the following example：

<script setup lang="ts">
import Prism from 'prismjs';
import { onMounted } from 'vue';

const codeTest1 = `
function handle(t, s) {
  let sum = 0
  sum += t * 0.3
  if (s <= 20) {
    sum += s * 1.8
  } else {
    sum += 20 * 1.8 + (s - 20) * 2.5
  }

  return sum < 9 ? 9 : sum
}
`

onMounted(() => {
  Prism.highlightAllUnder(document)
})
</script>

<template>
  <pre class="line-numbers">
    <code class="language-js">{{ codeTest1 }}</code>
  </pre>
</template>

<style>
</style>

But it doesn't work as I expected： result

The demo use vite and vue-ts template. The prismjs's version is ^1.23.0

Can anyone tell me why this is happening?