>>>
class Foo extends Bar {
  qux(n) {
    // Do some stuff
    if (x != null && x.y == n.z
        // and some other stuff.
        && n.parent.x != y) {
      // <snip>
    }
  }
}
<<<
class Foo extends Bar {
  qux(n) {
    // Do some stuff
    if (x != null &&
        x.y == n.z
        // and some other stuff.
        &&
        n.parent.x != y) {
      // <snip>
    }
  }
}