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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/* a rule with only comments: the selector block is still emitted (less semantics) */
.a {
  /* only comment */
}

/* comment + child rule: the comment stays in the parent block, which must not be dropped */
.b {
  /* c */
  .inner {
    x: 1;
  }
}

/* last statement inside a child rule: whitespace before `}` is trimmed */
.c {
  .inner {
    y: 2;
  }
}

/* empty blocks are not emitted */
.d {
}

/* less keeps whitespace before the semicolon */
.e {
  padding: 10px ;
}

/* comments between child rules are hoisted into the parent block */
.f {
  .i {
    z: 3;
  }
  /* mid */
  .j {
    w: 4;
  }
}