fix build error

fix build error

Author: internet5

.gitignore

@@ -0,0 +1,2 @@
+
+node_modules

example/index.js

@@ -5,7 +5,7 @@ fetch('https://raw.githubusercontent.com/internet5/smart-array-to-tree/master/ex
   return response.json();
 }).then(function(data) {
   console.log(new Date());
-  let tree = smartArrayToTree(data, { id:'regionId', pid:'parentId', firstPid:null });
+  var tree = smartArrayToTree(data, { id:'regionId', pid:'parentId', firstPid:null });
   console.log(new Date());
   console.log(tree)
 }).catch(function(e) {

index.js

@@ -8,14 +8,14 @@ module.exports = function smartArrayToTree(array, options) {
     children: 'children',
 	firstPid: null
   }, options);
-  let groupArray = groupBy(array, function (n) {
+  var groupArray = groupBy(array, function (n) {
     return n[options.pid];
   });
-  let firstArray = groupArray[options.firstPid];
+  var firstArray = groupArray[options.firstPid];
   transform(firstArray);
   function transform(startList) {
     if (startList)
-      for (let i = 0; i < startList.length; i++) {
+      for (var i = 0; i < startList.length; i++) {
         groupArray[startList[i][options.id]] && (startList[i][options.children] = groupArray[startList[i][options.id]]);
         transform(startList[i][options.children]);
       }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "smart-arraytotree",
-  "version": "1.0.6",
+  "version": "1.0.8",
   "description": "Convert large amounts of data array to tree fastly",
   "main": "index.js",
   "scripts": {

test/test.js

@@ -3,7 +3,7 @@ var smartArrayToTree = require('../index.js');
 var test = require('tape');
 
 test('totree test', function (t) {
-	let list=[
+	var list=[
 	{
 		id:'1',
 		param1:'xx',
@@ -35,7 +35,7 @@ test('totree test', function (t) {
 		pid:'3',
 	},
 			]
-    let tree = smartArrayToTree(list);
+    var tree = smartArrayToTree(list);
 
     t.equal(tree.length, 3);