JS modules can be imported and executed from CSS

[darrenscerri]

Do you want to request a feature or report a bug?

Bug

What is the current behavior?
Although this might be intended, it might not be correct to require certain files such as Javascript files from CSS.

If the current behavior is a bug, please provide the steps to reproduce.
See this repo for more information: https://github.com/darrenscerri/webpack-extract-text-plugin-empty-require-error.

Related issues:
webpack/webpack#4541
webpack-contrib/extract-text-webpack-plugin#465

[alexander-akait]

@darrenscerri Problem still exists?

[alexander-akait]

Confirm.
Input:

a {
  background-image: url("");
}

Output:

a {
  background-image: url("https://example.com/");
}

[alexander-akait]

Not related to css-loader. Information:

1. style-loader PR fix(urls): skip empty url() handling style-loader#304
2. Other bug in cssnano, he is rewrite url("") => url(.). Issue: Maybe bug with empty url cssnano/cssnano#444