refactor(Cypress): add nodemodules

node_modules/knuth-shuffle-seeded/index.js

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2013 AJ O'Neal
+ * Copyright 2015 Tiancheng "Timothy" Gu
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+'use strict'
+
+/**
+ * @file
+ *
+ * Implementation of the Fisher-Yates shuffle algorithm in JavaScript, with
+ * the possibility of using a seed to ensure reproducibility.
+ *
+ * @module knuth-shuffle-seeded
+ */
+
+var randGen = require('seed-random')
+
+/**
+ * Shuffle an array using the Fisher-Yates shuffle algorithm, aka Knuth
+ * shuffle.
+ *
+ * Note that this function overwrites the initial array. As a result if you
+ * would like to keep the original array intact, you have to copy the initial
+ * array to a new array.
+ *
+ * Implementation derived from http://stackoverflow.com/questions/2450954/.
+ *
+ * @param {Array} array An array that is to be shuffled.
+ * @param [seed=Math.random()] Seed for the shuffling operation. If
+ *                             unspecified then a random value is used.
+ * @return {Array} The resulting array.
+ */
+module.exports = function shuffle(array, seed) {
+  var currentIndex
+    , temporaryValue
+    , randomIndex
+    , rand
+  if (seed == null) rand = randGen()
+  else              rand = randGen(seed)
+
+  if (array.constructor !== Array) throw new Error('Input is not an array')
+  currentIndex = array.length
+
+  // While there remain elements to shuffle...
+  while (0 !== currentIndex) {
+    // Pick a remaining element...
+    randomIndex = Math.floor(rand() * (currentIndex --))
+
+    // And swap it with the current element.
+    temporaryValue = array[currentIndex]
+    array[currentIndex] = array[randomIndex]
+    array[randomIndex] = temporaryValue
+  }
+
+  return array
+}