gistfile1.js

 "Type::warehouse": {
  "constraint": create_enum('WH1', 'WH2'),
  "cucumber": {
    "type": "Given",
    "match"   : qr/the warehouse is "(WH\d)"/,
    "describe": "the warehouse is \"{0}\"",
  }
 },

  "Type::product_measurable": {
  "constraint": "Type::Bool",
  "cucumber": {
      "type": "When",
    "match": [
      qr/the product (is (not )?) measurable/,
      function (m) { return m == 'is ' }
    ],
    "describe": function (m) {
      return "the product is " . ( m ? '' : 'not ' ) . "measurable";
    },
  }
 }