NPM | Build Behaves Differently Inside Docker

Question

I was pulling my hair out trying to understand why inside docker npm bulid is behaving differently.

Answer

Issue was due to docker container was not seeing the same files as local npm build. I forgot to mount some files! We are using postcss for tailwind in one of our projects. There is a feature called tree-shaking which is during build deletes all unused styles from final bundle. So… Because I forgot to make some of our templates visiable to frontend container postcss thought that styles were not used and purged them.

What I Learned

1. When reading configuration files do not rush and reread carefully. In our tailwind.config.js it is directly stated that this files are going to be used for purging.
2. May there should be some type of error handling for such cases. When tailwind expects some files for purging but they are not persent, throw a warning.