<===> include.scss
@if (true) {
  display: none;
}
<===> input.scss
.my-scope {
  @import 'include.scss';
}
<===> error
Error: Properties are only allowed within rules, directives, mixin includes, or other properties.
        on line 2 of include.scss
        from line 2 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: expected "{".
  ,
2 |   display: none;
  |                ^
  '
  include.scss 2:16  @import
  input.scss 2:11    root stylesheet