Does not add type argument to ref

[kshksdrt]

For example,

@Component({})
export default class Customers extends Vue {
  customer: Customer | null = null
}

becomes

export default Vue.extend({
  setup(props, context) {
    const customer = ref(null)
    return {
      customer
    }
  }
})

instead of

export default Vue.extend({
  setup(props, context) {
    const customer = ref<Customer | null>(null)
    return {
      customer
    }
  }
})