Init. Map does not function and only working on backend at the moment.

node_modules/indexof/index.js

@@ -0,0 +1,10 @@
+
+var indexOf = [].indexOf;
+
+module.exports = function(arr, obj){
+  if (indexOf) return arr.indexOf(obj);
+  for (var i = 0; i < arr.length; ++i) {
+    if (arr[i] === obj) return i;
+  }
+  return -1;
+};