selector-no-union-class-name

Disallow union class names with the parent selector (&).

.class {
  &-union {
//↑
// This type usage of `&`
  }
}

The following patterns are considered warnings:

.class {
  &-union {}
}

.class {
  &_union {}
}

.class {
  &union {}
}

The following patterns are not considered warnings:

.class {
  &.foo {}
}

.class {
  & p {}
}