undercoat 0.12.2

Native Rust compiler for Less and Sass/SCSS — byte-compatible with lessc and dart-sass, no Node runtime
Documentation 
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// guard on a rule: emitted only when it matches; a non-matching rule is not emitted at all
@a: #ddd;
@b: 2;

.light when (lightness(@a) > 50%) {
  color: green;
}
.dark when (lightness(@a) < 50%) {
  color: orange;
}

.multiple when (@b = 1), (@b = 2) {
  color: red;
}
.multiple-gone when (@b = 1), (@b = 3) {
  color: blue;
}

.inheritance when (@b = 2) {
  .test-rule {
    color: black;
  }
  &:hover {
    color: pink;
  }
  .hideme when (@b = 1) {
    color: green;
  }
  & when (@b = 1) {
    hideme: green;
  }
}

.hideme when (@b = 1) {
  color: green;
}

.dont-split-me-up {
  width: 1px;
  & when (@b = 2) {
    color: red;
  }
  & when (@b = 2) {
    height: 1px;
  }
  * & when (@b = 2) {
    sibling: true;
  }
}

.mixin-with-guard-inside(@colWidth) {
  .clsWithGuard when (@colWidth <= 0) {
    display: none;
  }
}

.mixin-with-guard-inside(0px);

.scope-check when (@b = 2) {
  @k: 1px;
  & when (@b = 2) {
    @k: 2px;
    sub-prop: @k;
  }
  prop: @k;
}