`vue` cannot be imported in ESM

[danielroe]

Version

3.2.18

Reproduction link

codesandbox.io

Steps to reproduce

After 570c955 we now have a root-level index.mjs. But it's not packaged as it needs to be added to files array.The error is:

Error [ERR_UNSUPPORTED_DIR_IMPORT]: Directory import '/project/node_modules/vue/server-renderer' is not supported resolving ES modules imported from /project/dist/server/server.mjs
Did you mean to import vue/server-renderer/index.js?