It's been a time since I have been programming with Vue.
But when I started entering something like vuedef in a newly created .vue file it auto-suggested me the following instead of writing it all on my own:
<template>
</template>
<script>
</script>
<style>
</style>
I can't remember how I did that but I guess it was a certain word I had to type.
Maybe it comes from an VS-Code Addon?