use-promise.js

import { ref } from "@vue/composition-api";
export default function(fn) {
  const result = ref(null);
  const loading = ref(false);
  const error = ref(null);
  const createPromise = async (...args) => {
    loading.value = true;
    try {
      result.value = await fn(...args);
    } catch (err) {
      error.value = err;
    } finally {
      loading.value = false;
    }
  };
  return { result, loading, error, createPromise };
}