v3.14.1 (#4521)

* v3.14.1

* transform `const` & `let` to `var` in node_modules, for IE11

* rebuild dist

make-webpack-config.js

@@ -1,10 +1,11 @@
 var path = require("path")
 
-var webpack = require('webpack')
-var ExtractTextPlugin = require('extract-text-webpack-plugin')
-const CopyWebpackPlugin = require('copy-webpack-plugin')
-var deepExtend = require('deep-extend')
-const {gitDescribeSync} = require('git-describe')
+var webpack = require("webpack")
+var ExtractTextPlugin = require("extract-text-webpack-plugin")
+const CopyWebpackPlugin = require("copy-webpack-plugin")
+const UglifyJsPlugin = require("uglifyjs-webpack-plugin")
+var deepExtend = require("deep-extend")
+const {gitDescribeSync} = require("git-describe")
 const os = require("os")
 
 var pkg = require("./package.json")
@@ -28,7 +29,10 @@ var commonRules = [
         retainLines: true
       }
     }],
-    include: [ path.join(__dirname, "src") ]
+    include: [
+      path.join(__dirname, "src"),
+      path.join(__dirname, "node_modules", "object-assign-deep"),
+    ]
   },
   { test: /\.(txt|yaml)(\?.*)?$/,
     loader: "raw-loader" },
@@ -61,10 +65,10 @@ module.exports = function(rules, options) {
     }))
   }
 
-  if( specialOptions.minimize ) {   // production mode
+  if( specialOptions.minimize ) { // production mode
 
     plugins.push(
-      new webpack.optimize.UglifyJsPlugin({
+      new UglifyJsPlugin({
         sourceMap: true,
       }),
       new webpack.LoaderOptionsPlugin({
@@ -76,8 +80,8 @@ module.exports = function(rules, options) {
 
     plugins.push( new webpack.NoEmitOnErrorsPlugin())
 
-  } else {    // development mode
-    plugins.push(new CopyWebpackPlugin([ { from: 'test/e2e/specs', to: 'test-specs' } ]))
+  } else { // development mode
+    plugins.push(new CopyWebpackPlugin([ { from: "test/e2e/specs", to: "test-specs" } ]))
   }
 
   plugins.push(