text: import * as Vue from 'vue'
  
  var isVue2 = false
  var isVue3 = true
  var Vue2 = undefined
  
  function install() {}
  
  export function set(target, key, val) {
    if (Array.isArray(target)) {
      target.length = Math.max(target.length, key)
      target.splice(key, 1, val)
      return val
    }
    target[key] = val
    return val
  }
  
  export function del(target, key) {
    if (Array.isArray(target)) {
      target.splice(key, 1)
      return
    }
    delete target[key]
  }
  
  export * from 'vue'
  export {
    Vue,
    Vue2,
    isVue2,
    isVue3,
    install,
  }
  