How to pass props in single file Vue components?

Question

Vue.js

When I export a component

<script>

  export default {
    data () {
      props: ['a'],
      return {
        qwe: "Привет 2"
      }
    }
  }
</script>

In the console I get an error that some kind of loader / loader is needed -
"Module parse failed: Unexpected token (14:4)
You may need an appropriate loader to handle this file type."

Answer 1

export default {
  data () {
    props: ['a'],
    return {
      qwe: "Привет 2"
    }
  }
}

It's some kind of schizophrenia. Probably meant

export default {
  props: ['a'],
  data() {
    return {
      qwe: "Привет 2"
    }
  }
}