lina/src/directive/async.js

import Vue from 'vue'

Vue.directive('async', {
  async bind(el, binding) {
    const { value: asyncFn, arg } = binding
    if (typeof asyncFn === 'function') {
      const result = await asyncFn(arg)
      el.innerText = result
    }
  },
  async update(el, binding) {
    const { value: asyncFn, arg } = binding
    if (typeof asyncFn === 'function') {
      const result = await asyncFn(arg)
      el.innerText = result
    } else if (typeof asyncFn === 'object' && asyncFn.then) {
      const result = await asyncFn
      el.innerText = result
    } else {
      el.innerText = asyncFn
    }
  }
})