--target lib Conflicts with custom Webpack entry

[FlorianWendelborn]

Version

3.0.0-beta.6

Reproduction link

3YOURMIND/vue-yodify@0e47bed

Steps to reproduce

Install with this commit and compare with the previous commit (or remove the custom env stuff from the vue.config.js).

What is expected?

Build as library with correct entry point

What is actually happening?

Builds as app with wrong entry point