报错：类型“ComponentInternalInstance | null”上不存在属性“proxy”。ts(2339)

问题

在vue3+ts项目中，使用const { proxy } = getCurrentInstance()

报错：...类型"ComponentInternalInstance | null"

解决

既然会用到很多次getCurrentInstance()方法，索性直接封装一下

创建utils/useCurrentInstance.ts：

import { getCurrentInstance } from 'vue'
import type { ComponentInternalInstance } from 'vue'

export default function useCurrentInstance() {
  const instance = getCurrentInstance() as ComponentInternalInstance | null
  // 确保实例存在
  if (!instance) {
    throw new Error('useCurrentInstance must be used within a component setup')
  }

  const proxy = instance.appContext.config.globalProperties
  return {
    proxy
  }
}

使用时：

import useCurrentInstance from '@/utils/useCurrentInstance'

const { proxy } = useCurrentInstance()