<===> options.yml
---
:todo:
- dart-sass

<===> input.scss
[charset i] {
	display: block;
}

[charset I] {
	display: block;
}

[charset="utf-8" i] {
	display: block;
}

[charset="utf-8" I] {
	display: block;
}
<===> output.css
[charset i] {
  display: block;
}

[charset I] {
  display: block;
}

[charset="utf-8" i] {
  display: block;
}

[charset="utf-8" I] {
  display: block;
}