name: any
validator: {$ref: "http://firebase.com/schema/types/any#"}
compile:
  console.log("compile any");

  var required_constraint = "next == null || (true";
  if (api.getField("required") != null) {
    for (var idx in api.getField("required")){
      var required_property = api.getField("required")[idx];
      required_constraint = required_constraint + "&&next['"+required_property+"'].exists()"
    }
  }
  api.addConstraint(required_constraint + ")");