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

<===> input.scss
$var: orange;

.test {
  color: $var;
}

.#{$var} {
  color: #C0362C;
}

<===> output.css
.test {
  color: orange;
}

.orange {
  color: #C0362C;
}

<===> warning
WARNING on line 7, column 2 of input.scss:
You probably don't mean to use the color value `orange' in interpolation here.
It may end up represented as #ffa500, which will likely produce invalid CSS.
Always quote color names when using them as strings (for example, "orange").
If you really want to use the color value here, use `"" + $var'.

<===> warning-dart-sass
WARNING: You probably don't mean to use the color value orange in interpolation here.
It may end up represented as orange, which will likely produce invalid CSS.
Always quote color names when using them as strings or map keys (for example, "orange").
If you really want to use the color value here, use '"" + $var'.

  ,
7 | .#{$var} {
  |    ^^^^
  '
    input.scss 7:4  root stylesheet