--keep-classnames           Do not mangle/drop class names.
    --keep-fnames               Do not mangle/drop function names.  Useful for
                                code relying on Function.prototype.name.

class Class {
}

var c = Object.defineProperty;
var a = (s, l) => c(s, "name", { value: l, configurable: true });
class Class {
  static {
    a(this, "Class");
  }
}