Require style in render() or at top of document.

Hi guys, I'm wondering if anyone can help me with a question about the (s)css-loader used? The `const styles = require('./xxx.scss');` is always inside the render(). And I'm wondering why.
Because the classnames generated don't change when calling the module multiple times.

What are the advantages or disadvantage of putting the require at the top of the document instead of in the render function.