<===> options.yml
---
:todo:
- libsass

<===> _plain.css
plain {partial: true}

<===> input.scss
@import "plain";

<===> plain.css
plain {partial: false}

<===> error
Error: It's not clear which file to import. Found:
  _plain.css
  plain.css
  ,
1 | @import "plain";
  |         ^^^^^^^
  '
  input.scss 1:9  root stylesheet