I get the following error in my project that uses this package as a dependency:

DEPRECATION WARNING [import]: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

╷
3 │ @import "_variables";
│ ^^^^^^^^^^^^
╵
../node_modules/flagpack-dart-sass/src/flagpack.scss 3:9 root stylesheet

DEPRECATION WARNING [import]: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

More info and automated migrator: https://sass-lang.com/d/import

╷
4 │ @import "_mixins";
│ ^^^^^^^^^
╵
../node_modules/flagpack-dart-sass/src/flagpack.scss 4:9 root stylesheet

I think this issue can be fixed by changing @import to @use.