Hi,

Considering the following code:

.foo {
  &::before {
    .bar & {
      color: blue;
    }
  }
}

ParcelCSS will generate the following CSS:

.bar :is(.foo:before){color:#00f}

Playground URL

However, using a pseudo element selector is not valid inside :is, so it should generate this instead:

.bar .foo:before{color:#00f}