### Version 3.0.1 ### Reproduction link [https://github.com/vuejs](https://github.com/vuejs) ### Node and OS info babel-loader@8.0.2 requires a peer of @babel/core@^7.0.0 but none is installed. ### Steps to reproduce i created a project,run 'npm install'.showed the info 'babel-loader@8.0.2 requires a peer of @babel/core@^7.0.0 but none is installed.' ### What is expected? @babel/core 项目依赖安装完毕 ### What is actually happening? 需手动安装 <!-- generated by vue-issues. DO NOT REMOVE -->