1<===> input.scss
2$mediaquery: 'and (min-width: 300px)';
3
4@media all #{$mediaquery} {
5  div {
6    display: block;
7  }
8}
9
10<===> output.css
11@media all and (min-width: 300px) {
12  div {
13    display: block;
14  }
15}
16