text: "use strict";
  
  var actualMessageValues = require("../actual-message-values");
  
  module.exports = function (referee) {
    referee.add("isSet", {
      assert: function (actual) {
        return actual instanceof Set;
      },
      assertMessage: "${customMessage}Expected ${actual} to be a Set",
      refuteMessage: "${customMessage}Expected ${actual} not to be a Set",
      expectation: "toBeSet",
      values: actualMessageValues,
    });
  };
  