### Version 3.2.4 ### Reproduction link [https://github.com/akibrk/custom-element-test/tree/css-issue](https://github.com/akibrk/custom-element-test/tree/css-issue) ### Steps to reproduce Clone the repo - 1. `npm run install` 2. `npm run build` 3. copy the output from dist into demo directory 4. run `npx http-server` ### What is expected? Output with file path resolved, and img and css folders alongside the output files. ### What is actually happening? Path is not being resolved, no css/img folders generated. --- Custom elements with static assets. Not able to load assets from node_modules. <!-- generated by vue-issues. DO NOT REMOVE -->