Cannot Resolve Stylename If not explicitly a String

Take the following code snippet:

```
render() {
const appliedStyles = ['one', 'two'];
appliedStyles.push(this.props.a ? 'style-a' : 'style-b');

return (

What you'll see is that we'll end up getting something like `Unhandled rejection Error: Could not resolve the styleName 'style-a'.`

However, if we change the code ever so slightly to
```

Start by reproducing the issue with the supplied React snippet in babel-plugin-react-css-modules, comparing the array join expression with the template-literal form. Check how the Babel plugin resolves dynamic styleName expressions and compare the behavior with the linked non-Babel version; done means both forms resolve without the reported error.

Written by the indexing model from the issue text.