<===> first.scss
foo { bar: baz }

<===> input.scss
@import "first.css", "second.css" (max-width: 400px);
@import "first.scss", "second.scss" (max-width: 400px);

<===> second.scss
a { b: c }

<===> output.css
@import url(first.css);
@import "second.css" (max-width: 400px);
@import "second.scss" (max-width: 400px);
foo {
  bar: baz;
}

<===> output-dart-sass.css
@import "first.css";
@import "second.css" (max-width: 400px);
@import "second.scss" (max-width: 400px);
foo {
  bar: baz;
}