pixsy/node_modules/less/test/less-bom/extend-media.less

.ext1 .ext2 {
  background: black;
}

@media tv {
  .ext1 .ext3 {
    color: white;
  }
  .tv-lowres :extend(.ext1 all) {
    background: blue;
  }
  @media hires {
    .ext1 .ext4 {
      color: green;
    }
    .tv-hires :extend(.ext1 all) {
      background: red;
    }
  }
}

.all:extend(.ext1 all) {

}