Vue getCurrentInstance returns null (SSR)

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Describe the bug

If I re-export Vue's getCurrentInstance from a package inside node_modules, it always returns null during SSR.

Reproduction

Create a package, for example:

packages/playground/ssr-vue/node_modules/foo/index.js:

export { getCurrentInstance } from 'vue'

packages/playground/ssr-vue/node_modules/foo/package.json:

{ "name": "foo" }

packages/playground/ssr-vue/App.vue:

<script lang="ts" setup>
import { getCurrentInstance } from 'foo'

console.log(getCurrentInstance())
//=> null in ssr
</script>

System Info

• vite version: 2.0.0-beta.63 (main #b065ede3)
• Operating System:
• Node version:
• Package manager (npm/yarn/pnpm) and version:

Logs (Optional if provided reproduction)

1. Run vite or vite build with the --debug flag.
2. Provide the error log here.