Describe the bug

A clear and concise description of what the bug is.

System Info

• required vite version:0.11.3
• required Operating System:
• required Node version:10.13.0
• Optional:
  • npm/yarn version
  • Installed vue version (from yarn.lock or package-lock.json)
  • Installed @vue/compiler-sfc version

Logs

why ?

use import { IS_PRD } from './utils/index.js' instead

use import { IS_PRD } from './utils/index.js' instead

some packages used import xxx from 'xxx' in node_modules directory