first commit

lib/js/polyfills.js

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+/*
+* Polyfills used to provide modern JS features on older browsers that do not natively support them
+*/
+
+
+/**
+* Copy all enumerable own properties from one or more source objects to a target object
+* 
+* As per https://developer.mozilla.org/en-US/docs/MDN/About#Copyrights_and_licenses this code is in the public domain:
+* "Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/"
+* 
+* @param  {object}  target   Target object
+* @param  {object}  varArgs  One or more source objects
+* 
+* @return {object} Returns the target object
+*/
+if (typeof Object.assign !== 'function') {
+  // Must be writable: true, enumerable: false, configurable: true
+  Object.defineProperty(Object, "assign", {
+    value: function assign(target, varArgs) { // .length of function is 2
+      'use strict';
+      if (target === null || target === undefined) {
+        throw new TypeError('Cannot convert undefined or null to object');
+      }
+
+      var to = Object(target);
+
+      for (var index = 1; index < arguments.length; index++) {
+        var nextSource = arguments[index];
+
+        if (nextSource !== null && nextSource !== undefined) { 
+          for (var nextKey in nextSource) {
+            // Avoid bugs when hasOwnProperty is shadowed
+            if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
+              to[nextKey] = nextSource[nextKey];
+            }
+          }
+        }
+      }
+      return to;
+    },
+    writable: true,
+    configurable: true
+  });
+}