Build error for CSS modules with :root only

[jsikorski]

We have encountered an issue with CSS modules that don't contain any "default" classes but include :root pseudo-class. For example for declarations.scss file with the following content:

:root { --background: green; }

the build result is:

Adding any "default" class to this file solves the problem.

[Obi-Dann]

Publish in version V2.2.1