Composition API: extraction functions

example.vue

<script>
import { ref } from "vue";
 
export function useCounter() {
 const counter = ref(0);
 const plusOne = () => { counter.value += 1 };
 
 return { counter, plusOne };
}

export default {
  name: "MyComponent",
  setup() {
    const { counter, plusOne } = useCounter()
    return { counter, plusOne }
  }
}
</script>