CSS modules purging

[Kapelianovych]

Hello! I am using the CSS modules for writing styles. Some of the classes aren't applied to the markup immediately. Example,

import { stateClass } from './index.module.css';

<div className={someCondition ? stateClass : '' }> ... </div>

And the rules of the stateClass seem to be purged from the final CSS output. Is there a way to preserve the rules? I haven't found any hints about using the PurgeCSS or a custom purging implementation or the configuration for it.
I don't have a PostCSS config in a project.

Thanks in advance.

[Kapelianovych]

No. It is my bad. I didn't notice that I've added an extra character to the CSS class list, which simply invalidates the class selector. Everything works fine.