Generated by SassMeister.com.

SassMeister-input.sass

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

=item($extend: item)
    @if $extend
        @extend %#{ $extend }
    @else
        color: red

%item
    +item(false)



.foo 
    +item

.bar
    +item


@media screen and (min-width: 641px)
    .baz
        +item(false)

SassMeister-output.css

.foo, .bar {
  color: red;
}

@media screen and (min-width: 641px) {
  .baz {
    color: red;
  }
}