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sassで起点要素に状態セレクタ持たせた実装したかった話

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とあるhtmlのcomponentがあったとする。
それはモーダルを内包したcomponentだった。

.component-A(class='is-modalView' if isModalView)
  .wrap
    // ...
    .modal
       .contents

それにsassでスタイルを当てたとする

.component-A {
  .wrap {
    .modal {
      display: none;
    }
  }
}

.component-A.is-modalViewの時に.modalをdisplay: block;にしたいけど&が.component-A .wrap .modalを全部持ってるのでネスト脱出するのが案外むずい。

sass3.3から@at-rootが導入されてるのでそれと補完構文を組み合わせればそこそこうまくいけた

.component-A {
  .wrap {
    .modal {
      display: none;
      @at-root .is-modalView#{&} {
        display: block;
      }
    }
  }
}

どうでしょう、キモさが目立ちますかね。

サンプル

See the Pen 16a91c738d02d1fb90e7 by nazomikan (@nazomikan) on CodePen.

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